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CN109460099A - Electrical equipment surface temperature rise current tracking examination and adjustment device and the method for inspection - Google Patents

Electrical equipment surface temperature rise current tracking examination and adjustment device and the method for inspection Download PDF

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Publication number
CN109460099A
CN109460099A CN201811578139.9A CN201811578139A CN109460099A CN 109460099 A CN109460099 A CN 109460099A CN 201811578139 A CN201811578139 A CN 201811578139A CN 109460099 A CN109460099 A CN 109460099A
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current
electrical equipment
test
data
temperature
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CN109460099B (en
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张红奎
刘明琦
谭威威
杨华松
张年维
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CCTEG China Coal Technology and Engineering Group Corp
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CCTEG China Coal Technology and Engineering Group Corp
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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10Regulating voltage or current
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

The present invention relates to electrical equipment temperature rise test fields, electrical equipment temperature-rise current tracking adjustment verifying attachment, including PLC unit, AD conversion unit, high-current generation device, voltage controller power source, tested electrical equipment, motor mechanism, electromagnetic relay A, electromagnetic relay B, A.C. contactor, thermocouple A group, thermocouple B group, current transformer, range automatic identification unit, controller switching equipment, voltage transformer group and memory, this verifying attachment tests to the temperature rise test of electrical equipment, improve the precision and stability of temperature rise test, it reduces and examines workload, improve checkability, shorten electrical equipment temperature rise round of visits, save electric power resource.The present invention also proposes the electrical equipment temperature-rise current tracking adjustment method of inspection.

Description

Electrical equipment surface temperature rise current tracking adjustment checking device and checking method
Technical Field
The invention relates to the field of temperature rise tests of electrical equipment, in particular to a device and a method for automatically tracking and adjusting surface temperature rise current of electrical equipment and intelligently judging and checking qualification.
Background
Electrical equipment is distributed in various fields of social economy such as electric power, metallurgy, mines, aerospace and the like, belongs to electric energy transmission and conversion carriers and energy consumption terminals, and the safety of the electrical equipment is directly related to the stability of the equipment and the safety of lives and properties of people. The temperature rise test is used for testing the temperature rise value of some parts of the electrical equipment under the specified working condition, and is an important test item for the test and the shaping test in the development process of the electrical equipment. Too high a temperature rise value can cause insulation damage, mechanical deformation, accelerated aging process, increased failure rate of electrical equipment, and even accidents such as electric shock, electrical fire, explosion and the like. The existing temperature rise inspection device needs to manually adjust the test current, record test data and judge inspection results, cannot realize current tracking adjustment, automatic data recording and intelligent qualification judgment, is complex in inspection process, increases the workload of inspectors, and simultaneously causes the waste of electric energy due to long-time power supply.
Disclosure of Invention
In order to solve the problems, the invention provides a tracking, adjusting and checking device for the surface temperature rise current of electrical equipment, which solves the problems of complex checking process, long checking period, low automation level, large workload, electric energy waste and the like in the current temperature rise checking process. Meanwhile, the invention also provides a tracking adjustment and inspection method for the surface temperature rise current of the electrical equipment.
In order to achieve the purpose, the invention adopts the technical scheme that:
in the first technical scheme, the electric equipment surface temperature rise current tracking adjustment inspection device comprises a PLC unit, an analog-to-digital conversion unit, a large current generation device, a voltage regulation power supply, inspected electric equipment, a motor mechanism, an electromagnetic relay A, an electromagnetic relay B, an alternating current contactor, a thermocouple group A, a thermocouple group B, a current transformer, a range automatic identification unit, power distribution equipment, a voltage transformer group and a memory;
the output end of the distribution equipment is connected with the input end of a voltage-regulating power supply through an alternating current contactor, the output end of the voltage-regulating power supply is connected with the input end of a large-current generating device, connecting terminals of detected electrical equipment are respectively connected with connecting terminals of the large-current generating device, the output voltage regulating end of the voltage-regulating power supply is connected with a main shaft of a motor mechanism, the control signal input end of the motor mechanism is connected with the output ends of an electromagnetic relay A and an electromagnetic relay B, the electromagnetic relay A and the electromagnetic relay B are used for current regulation, the electromagnetic relay A and the electromagnetic relay B work independently and do not attract at the same; when the electromagnetic relay B is switched on, the current is reduced; the action signal input ends of an electromagnetic relay A and an electromagnetic relay B are connected with the signal output end of a PLC unit, the measuring ends of a thermocouple group A and a thermocouple group B are respectively connected with the surface of the electrical equipment to be tested and the test environment, the signal output ends of the thermocouple group A and the thermocouple group B are connected with the signal input end of an analog-to-digital conversion unit, the measuring end of a current transformer is connected with a temperature rise test loop, the signal output end of the current transformer is connected with the signal input end of the analog-to-digital conversion unit, the input end of a range automatic identification unit is connected with the signal output end of the PLC unit, the output end of the range automatic identification unit is connected with different range gears of the current transformer, the measuring end of a voltage transformer group is connected with the primary side and the secondary side of a voltage regulating power, the signal output end of the analog-to-digital conversion unit is connected with the signal input end of the PLC unit, the control signal input end of the alternating current contactor is connected with the signal output end of the PLC unit, and the signal communication end of the memory is connected with the communication end of the PLC unit.
In a first technical scheme, as preferred, the range automatic identification unit includes range discernment treater and electromagnetic relay group, electromagnetic relay group includes a plurality of electromagnetic relay, current transformer has a plurality of range, the signal output part of PLC unit is connected with range discernment treater signal input part, the control signal output part of range discernment treater with electromagnetic relay group's control signal input part is connected, and electromagnetic relay group in the quantity of electromagnetic relay and current transformer measure the journey to correspond in the range through electromagnetic relay automatic selection current transformer.
In the first technical solution, preferably, the electric device surface temperature rise current tracking adjustment checking device further includes a humidity sensor, an air pressure sensor and an air speed sensor, and signal output ends of the humidity sensor, the air pressure sensor and the air speed sensor are connected with a signal input end of the analog-to-digital conversion unit.
In the first technical solution, preferably, the device for tracking, adjusting and checking the surface temperature rise current of the electrical equipment further comprises a display screen, a control panel, an industrial computer and a printer, wherein a signal input end of the display screen is connected with a signal output end of the PLC unit; the signal output end of the control panel is connected with the signal input end of the PLC unit, the communication port of the industrial computer is connected with the communication signal port of the PLC unit, and the printing signal output end of the industrial computer is connected with the data input end of the printer.
In the first technical scheme, preferably, the power distribution equipment comprises a protection cabinet and a power distribution cabinet, wherein a main loop output end of the power distribution cabinet is connected with a main loop input end of the protection cabinet, and a main loop output end of the protection cabinet is connected with an input end of a voltage regulating power supply through an alternating current contactor; the emergency stop control system is characterized in that emergency stop signal input terminals are respectively arranged on the power distribution cabinet and the protection cabinet, and the output ends of the emergency stop button A and the emergency stop button B are respectively connected with the emergency stop signal input terminals of the power distribution cabinet and the protection cabinet.
In a second technical scheme, the method for tracking, adjusting and checking the surface temperature rise current of the electrical equipment comprises the following steps,
step 1, starting a temperature rise test environmental parameter measuring sensor of the tested electrical equipment, collecting wind speed, temperature, humidity and atmospheric pressure data of a test environment, and displaying and storing the data;
step 2, controlling an operation panel button to electrify the operation table, adjusting test current, introducing the test current to the detected electrical equipment, observing whether the working state of the electrical equipment is normal or not, and searching the highest point of the surface temperature by using a thermal imager;
step 3, cutting off the test current, fixing a thermocouple at the highest point of the surface temperature of the detected electrical equipment by using an adhesive method, placing the thermocouple for measuring the ambient air temperature at a position of about 1m and half of the height of the detected electrical equipment, starting a tracking adjustment detection device of the surface temperature rise current of the detected electrical equipment, introducing the test current, detecting the actual test current value in real time, and automatically tracking and adjusting the current if the actual test current value is lower than the standard specified test current value until the requirements are met;
step 4, acquiring, calculating and storing thermocouple feedback data in real time, carrying out comprehensive comparison and analysis on the data, judging that the test is finished when the difference value of two temperature data separated by one hour is less than 1K;
and 5, cutting off the test current, and calling the database data to judge the qualification of the temperature rise test result of the tested electrical equipment.
In the second technical means, preferably, in the step 2, the method further comprises
And step 21, when the test current is introduced, the range automatic identification unit identifies the magnitude of the test current, the range of the current transformer is automatically selected according to the magnitude of the test current, and the test precision of the current is improved.
In the second technical means, preferably, the step 3 further includes a step 31 of changing the test loop current when the surface temperature of the electrical device to be tested and the test environment change, and adjusting the voltage of the voltage-regulating power supply to keep the test current constant, wherein the step 31 includes the steps of:
311, collecting the current value of the detected electrical equipment;
step 312, subtracting the collected test current value of the detected electrical equipment from a preset current value and performing absolute value calculation;
313, judging whether the absolute value of the difference value between the collected tested electrical equipment test current value and a preset current value is smaller than F, and returning to 311 if the difference value result is smaller than F; if the difference result is greater than or equal to F, go to step 314;
step 314, adjusting the test current by adjusting the voltage of the voltage-regulating power supply;
step 315, judging whether the difference value between the acquired current value of the detected electrical equipment and the preset current value is smaller than H, if the difference value result is smaller than H, ending the adjustment of the current introduced by the current introduced once, and returning to the step 311; if the difference result is greater than or equal to H, return to step 314(H < F).
In the second technical solution, preferably, in step 4, before the data is comprehensively compared and analyzed, step 41 is performed to remove the interference data in the acquired temperature data, where step 41 includes
Step 411, acquiring n data in a single calculation period of the temperature data;
step 412, calculating the change rate T of the surface temperature data of the detected electrical equipment, wherein the change rate T satisfies the formula T ═ Tj-tj-1Wherein t isj-tj-1The difference value of two adjacent acquisition temperatures is obtained;
step 413, calculate the average of the rate of change TMean value ofSatisfy the formulaWherein i is an integer, and i is 1, 2, 3, … n,the average value of the n temperature data change rates in a single calculation period is obtained;
step 414, verifying the collected temperature data tnIf, ifWhere P is the temperature value change rate difference comparison coefficient, then tnIf true value data is obtained, recording, displaying and storing the true value data as temperature test data; if not satisfied withReject tnData and proceed to step 415;
step 415, re-estimating t according to the temperature rise test data and the data change rate acquired in the previous M timesnData are recorded as tnMaking a temperature change rate difference comparison to determine, e.g. usingThen consider tnIs true data, which is taken asAnd recording, displaying and storing the temperature rise test data.
In the second technical solution, preferably, in step 4, after step 41, the method further comprises: and 42, judging a temperature rise result after the temperature rise test data is recorded for 1 hour, wherein the step 42 comprises the following steps:
step 421, retrieving the effective temperature data of the detected electrical equipment recorded in step 415;
step 422, calculating the difference between the current temperature data and the effective temperature data which is spaced for 1 hour, and importing the difference into a formula(3) If the 5 inequalities in the formula (3) are all true, judging that the test is finished, and judging the qualification of the temperature rise test of the detected electrical equipment according to the required value about the temperature rise in the relevant standard of the detected electrical equipment, the uncertainty of the detection result and the test result; if any of the inequalities in the formula (3) is not satisfied, the process returns to step 421, and the temperature rise test is continued.
The beneficial effects of the invention are as follows:
the invention adopts the electric equipment surface temperature rise current tracking adjustment inspection device to inspect the temperature rise test of the electric equipment, improves the precision and stability of the temperature rise test, reduces the inspection workload, improves the inspection efficiency, shortens the temperature rise inspection period of the electric equipment, saves the power resource, provides original data support for the type selection of the electric equipment components and insulating materials, ensures the safety performance of the electric equipment, avoids the safety production accidents caused by the electric equipment faults, and has important theoretical and practical significance for guaranteeing the social stability and the life and property safety of people.
Drawings
FIG. 1 is a schematic view of the connection structure of elements of the surface temperature rise current tracking adjustment inspection device for electrical equipment according to the present invention.
Fig. 2 is a schematic view of an automatic range identification unit of the surface temperature rise current tracking adjustment inspection device of the electrical equipment.
Fig. 3 is a flow chart of current real-time detection and tracking adjustment in the method for tracking, adjusting and inspecting the surface temperature rise current of the electrical equipment.
FIG. 4 is a flowchart of the calculation of the temperature value change rate difference comparison method in the method for tracking, adjusting and inspecting the surface temperature rise current of the electrical equipment.
Fig. 5 is a flowchart of the qualification determination of the temperature rise test in the method for tracking, adjusting and inspecting the surface temperature rise current of the electrical equipment.
The reference numerals include:
1-PLC unit, 2-analog-digital conversion unit, 3-display screen, 4-large current generating device, 5-protective cabinet, 6-voltage regulating power supply, 7-detected electric equipment, 8-motor mechanism, 9-electromagnetic relay A, 10-electromagnetic relay B, 11-AC contactor, 12-control panel, 13-thermocouple A group, 14-thermocouple B group, 15-current transformer, 16-range automatic identification unit, 17-voltage transformer group, 18-humidity sensor, 19-air pressure sensor, 20-wind speed sensor, 21-industrial computer, 22-printer, 23-memory, 24-power distribution cabinet, 25-emergency stop button A, 26-emergency stop button B and 27-range identification processor, 28-electromagnetic relay group.
Detailed Description
In order to make the purpose, technical solution and advantages of the present technical solution more clear, the present technical solution is further described in detail below with reference to specific embodiments. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present teachings.
As shown in fig. 1 and 2, the temperature rise current tracking adjustment checking device for the surface of the electrical equipment comprises a PLC unit 1, an analog-to-digital conversion unit 2, a large current generation device 4, a voltage regulation power supply 6, detected electrical equipment 7, a motor mechanism 8, an electromagnetic relay a9, an electromagnetic relay B10, an alternating current contactor 11, a thermocouple a group 13, a thermocouple B group 14, a current transformer 15, an automatic range identification unit 16, distribution equipment, a voltage transformer group 17 and a memory 23;
the output end of the distribution equipment is connected with the input end of a voltage-regulating power supply 6 through an alternating current contactor 11, the output end of the voltage-regulating power supply 6 is connected with the input end of a large-current generating device 4, connecting terminals of detected electrical equipment 7 are respectively connected with connecting terminals of the large-current generating device 4, the output voltage regulating end of the voltage-regulating power supply 6 is connected with a main shaft of a motor mechanism 8, the control signal input end of the motor mechanism 8 is connected with the output ends of an electromagnetic relay A9 and an electromagnetic relay B10, the electromagnetic relay A9 and the electromagnetic relay B10 are used for current regulation, the two independently work and do not attract at the same time, and when an electromagnetic relay; when the electromagnetic relay B10 is switched on, the current is reduced; the action signal input ends of an electromagnetic relay A9 and an electromagnetic relay B10 are connected with the signal output end of a PLC unit 1, the measuring ends of a thermocouple A group 13 and a thermocouple B group 14 are respectively connected with the surface of the electrical equipment 7 to be tested and the test environment, the signal output ends of the thermocouple A group 13 and the thermocouple B group 14 are connected with the signal input end of an analog-to-digital conversion unit 2, the measuring end of a current transformer 15 is connected with a temperature rise test loop, the signal output end of the current transformer 15 is connected with the signal input end of the analog-to-digital conversion unit 2, the input end of an automatic range identification unit 16 is connected with the signal output end of the PLC unit 1, the output end of the automatic range identification unit 16 is connected with different range gears of the current transformer 15, the measuring end of a voltage transformer group 17 is connected with the primary side and the secondary side of a voltage regulator 6, the signal, the signal output end of the analog-to-digital conversion unit 2 is connected with the signal input end of the PLC unit 1, the control signal input end of the alternating current contactor 11 is connected with the signal output end of the PLC unit 1, and the signal communication end of the memory 23 is connected with the communication end of the PLC unit 1.
The automatic range identification unit 16 comprises a range identification processor 27 and an electromagnetic relay group 28, the electromagnetic relay group 28 comprises a plurality of electromagnetic relays, the current transformer 15 has a plurality of ranges, the signal output end of the PLC unit 1 is connected with the signal input end of the range identification processor 27, the control signal output end of the range identification processor 27 is connected with the control signal input end of the electromagnetic relay group 28, and the number of the electromagnetic relays in the electromagnetic relay group 28 corresponds to the range in the current transformer 15, so that the ranges in the current transformer 15 can be automatically selected through the electromagnetic relays.
The electric equipment surface temperature rise current tracking adjustment checking device further comprises a humidity sensor 18, an air pressure sensor 19 and an air speed sensor 20, wherein signal output ends of the humidity sensor 18, the air pressure sensor 19 and the air speed sensor 20 are connected with a signal input end of the analog-to-digital conversion unit 2.
The electric equipment surface temperature rise current tracking adjustment inspection device also comprises a display screen 3, a control panel 12, an industrial computer 21 and a printer 22, wherein the signal input end of the display screen 3 is connected with the signal output end of the PLC unit 1; the signal output end of the control panel 12 is connected with the signal input end of the PLC unit 1, the communication port of the industrial computer 21 is connected with the communication signal port of the PLC unit 1, and the printing signal output end of the industrial computer 21 is connected with the data input end of the printer 22.
The power distribution equipment comprises a protection cabinet 5 and a power distribution cabinet 24, wherein the main loop output end of the power distribution cabinet 24 is connected with the main loop input end of the protection cabinet 5, and the main loop output end of the protection cabinet 5 is connected with the input end of a voltage regulating power supply 6 through an alternating current contactor 11; the power distribution cabinet 24 and the protection cabinet 5 are respectively provided with an emergency stop signal input terminal, and the output ends of the emergency stop button A25 and the emergency stop button B26 are respectively connected with the emergency stop signal input terminals of the power distribution cabinet 24 and the protection cabinet 5.
The invention adopts the electric equipment surface temperature rise current tracking adjustment inspection device to inspect the temperature rise test of the electric equipment, improves the precision and stability of the temperature rise test, reduces the inspection workload, improves the inspection efficiency, shortens the temperature rise inspection period of the electric equipment, saves the power resource, provides original data support for the type selection of the electric equipment components and insulating materials, ensures the safety performance of the electric equipment, avoids the safety production accidents caused by the electric equipment faults, and has important theoretical and practical significance for guaranteeing the social stability and the life and property safety of people.
Example 2
The method for tracking, adjusting and inspecting the surface temperature rise current of the electrical equipment provided in the embodiment uses the device for tracking, adjusting and inspecting the surface temperature rise current of the electrical equipment provided in the embodiment 1.
As shown in fig. 3-5, in detail, the method for tracking, adjusting and checking the temperature rise current on the surface of the electrical equipment comprises the following steps,
step 1, starting a temperature rise test environment parameter measuring sensor of the tested electrical equipment 7, collecting wind speed, temperature, humidity and atmospheric pressure data of a test environment, and displaying and storing the data;
step 2, controlling an operation panel button to electrify the operation table, adjusting test current, introducing the test current to the detected electrical equipment 7, observing whether the working state is normal or not, and searching the highest point of the surface temperature by using a thermal imager;
step 3, cutting off the test current, fixing a thermocouple at the highest point of the surface temperature of the detected electrical equipment 7 by using an adhesive method, placing the thermocouple for measuring the ambient air temperature at a position of about 1m and half of the height of the detected electrical equipment 7, starting a temperature rise current tracking adjustment detection device of the detected electrical equipment 7, introducing the test current, simultaneously detecting the actual test current value in real time, and if the actual test current value is lower than the standard specified test current value, automatically tracking and adjusting the current until the requirements are met;
step 4, acquiring, calculating and storing thermocouple feedback data in real time, carrying out comprehensive comparison and analysis on the data, judging that the test is finished when the difference value of two temperature data separated by one hour is less than 1K;
and 5, cutting off the test current, and calling database data to judge the qualification of the temperature rise test result of the detected electrical equipment 7.
In step 2, the method further comprises
And step 21, when the test current is introduced, the range automatic identification unit 16 identifies the magnitude of the test current, and automatically selects the range of the current transformer 15 according to the magnitude of the test current, so that the test precision of the current is improved.
In step 3, step 31 is further included, when the surface temperature of the electrical device 7 to be tested and the test environment change, the test loop current changes, and the voltage of the voltage-regulating power supply 6 is adjusted to keep the test current constant, wherein the step 31 includes the following steps:
step 311, collecting the current value of the detected electrical equipment 7;
step 312, subtracting the collected test current value of the detected electrical equipment 7 from a preset current value and performing absolute value calculation;
313, judging whether the absolute value of the difference value between the acquired test current value of the detected electrical equipment 7 and the preset current value is smaller than F, and returning to 311 if the difference value result is smaller than F; if the difference result is greater than or equal to F, go to step 314;
step 314, adjusting the test current by adjusting the voltage of the voltage-regulating power supply 6;
step 315, judging whether the difference value between the acquired current value of the detected electrical equipment 7 and the preset current value is smaller than H, if the difference value result is smaller than H, ending the current introduction by regulating the current introduction once, and returning to the step 311; if the difference result is greater than or equal to H, the process returns to step 314.
In the second technical solution, preferably, in step 4, before the data is comprehensively compared and analyzed, step 41 is performed to remove the interference data in the acquired temperature data, where step 41 includes
Step 411, acquiring n data in a single calculation period of the temperature data;
step 412, calculating a change rate T of the surface temperature data of the detected electrical device 7, where the change rate T satisfies the formula T ═ Tj-tj-1Wherein t isj-tj-1The difference value of two adjacent acquisition temperatures is obtained;
step 413, calculate the average of the rate of change TMean value ofSatisfy the formulaWherein i is an integer, and i is 1, 2, 3, … n,the average value of the n temperature data change rates in a single calculation period is obtained;
step 414, verifying the collected temperature data tnIf, ifWhere P is the temperature value change rate difference comparison coefficient, then tnIf true value data is obtained, recording, displaying and storing the true value data as temperature test data; if not satisfied withReject tnData and proceed to step 415;
step 415, re-estimating t according to the temperature rise test data and the data change rate acquired in the previous M timesnData are recorded as tnMaking a temperature change rate difference comparison to determine, e.g. usingThen consider tnThe data is true value data, which is recorded, displayed and stored as temperature rise test data.
In step 4, step 41 is followed by: and 42, judging the temperature rise result after the temperature rise test data is recorded for 1 hour, wherein the step 42 comprises the following steps:
step 421, retrieving the temperature valid data of the detected electrical device 7 recorded in step 415;
step 422, calculating the difference between the current temperature data and the effective temperature data which is spaced for 1 hour, and importing the difference into a formula(3) If 5 inequalities in the formula (3) are all true, the test is judged to be finished, and the qualification of the temperature rise test of the detected electrical equipment 7 is judged according to the required value of the temperature rise in the relevant standard of the detected electrical equipment 7, the uncertainty of the detection result and the test result; if any of the inequalities in the formula (3) is not satisfied, the process returns to step 421, and the temperature rise test is continued.
Specifically, the temperature rise test inspection process of the surface temperature rise current tracking adjustment inspection device of the electrical equipment is as follows:
(1) checking whether the appearance of the detected electric equipment 7 is finished and whether the basic function is normal;
(2) selecting a proper lead according to standard specified test current, and carrying out temperature rise test line connection;
(3) starting a temperature rise test environment parameter measuring sensor of the tested electrical equipment 7, and acquiring wind speed, temperature, humidity and atmospheric pressure data of a test environment by a PLC (programmable logic controller), and displaying and storing the data;
(4) controlling an operation panel button to electrify the operation table, adjusting test current, introducing the test current to the detected electrical equipment 7, observing whether the working state is normal or not, and searching the highest point of the surface temperature by using a thermal imager;
(5) cutting off the test current, fixing a thermocouple at the highest point of the surface temperature of the detected electrical equipment 7 by using an adhesive method, placing the thermocouple for measuring the ambient air temperature at the position of about 1m and half of the height of the detected electrical equipment 7, starting the temperature-rising current tracking and adjusting inspection device of the detected electrical equipment 7, and introducing the test current. Meanwhile, the actual test current value is detected in real time, and if the actual test current value is lower than the standard specified test current value, the current is automatically tracked and adjusted until the requirement is met;
(6) the PLC collects and stores thermocouple feedback data in real time, comprehensive comparison and analysis of the data are carried out, the difference value of the temperature data is less than 1K twice at one hour interval, and the test is judged to be finished;
(7) the PLC cuts off the test current and calls database data to judge the qualification of the temperature rise test result of the tested electrical equipment 7;
(8) and (5) finishing the test equipment to finish the temperature rise test inspection.
Wherein, the rated currents of different electrical equipment are different, and the temperature rise test current difference is very big. The current transformer 15 with a single measuring range has too low measuring precision when measuring small current, so that the errors of the current and the test result of the temperature rise test are large, and the standard requirements are not met. The patent adopts the automatic range identification unit 16, and selects the reasonable range of the current transformer 15 according to the magnitude of the test current (the test current is about two thirds of the range), so as to realize the accurate measurement of the temperature rise test current value of the tested electrical equipment 7. The current transformer 15 selects equipment with seven ranges (0-30A, 0-50A, 0-100A, 0-200A, 0-500A, 0-1000A and 0-2000A) by combining different rated currents of the common detected electrical equipment 7, the automatic range identification unit 16 consists of a range identification processor 2727 and a relay matrix, the range identification processor 27 receives a required test current value sent by the PLC unit 1, then the appropriate range is judged and selected, the relay corresponding to the range of the current transformer 15 is controlled to be attracted, and the functions of automatic identification and selection are achieved.
Because the temperature rise test of the tested electrical equipment 7 lasts for a long time (generally several hours), the resistance value of the test line is increased due to the current thermal effect, and the current value of the test loop is reduced (10% -20% of the test current), the current value needs to be manually adjusted in real time in the test process. The temperature rise current tracking adjustment inspection device of the electrical equipment 7 to be inspected detects a test current value in real time by utilizing a PLC, compares the test current value with a set current value, sends a driving instruction when the test current value is lower (higher) than the set current value, controls the motor mechanism 8 to act through an electromagnetic relay, adjusts the output of the test current to meet the set value, and realizes the functions of online detection and real-time adjustment of the test current.
In the process of acquiring the temperature rise value, in order to avoid the influence of interference signals on the temperature rise test, the patent proposes that interference data in test acquisition data are eliminated based on a temperature value change rate difference comparison method, and the reliability and the measurement precision of a test result are ensured. The temperature value change rate difference comparison method is used for collecting temperature data after a test is started, the calculation period of the temperature data is 1s, operation is started after M calculation periods are collected (M is more than or equal to 5), and the specific operation process is described as follows: acquiring n data within a single calculation period of temperature data, t being in turn1,t2…, n, the rate of temperature change is:
T=tj-tj-1(1)
where j is an integer, and j ═ 1, 2, 3, … n, such as: t is1=t1-t0(t0Last data of last calculation cycle), the average value of the temperature change rate in a single calculation cycle is
Wherein i is an integer, and i is 1, 2, 3, … n,is the average of the n temperature data rates of change over a single calculation period. If it is not(P is a temperature value change rate difference comparison coefficient), then t is considered to benIf true value data is obtained, recording, displaying and storing the true value data as temperature test data, otherwise, considering the data as interference data, and rejecting tnData, re-estimating t according to the temperature rise test data and data change rate acquired in the previous M timesnData (denoted t)n") and subjected to a temperature change rate difference comparison, e.g. as Then consider tnThe data is true value data, which is recorded, displayed and stored as temperature rise test data.
The patent realizes intelligent judgment and automatic data storage of temperature rise test results, and starts to judge the temperature rise results after the temperature rise test data is recorded for 1 hour, and the specific implementation mode is described as follows: after the calculation period of the temperature data is finished, the difference operation is carried out on the temperature value and the temperature data before 1 hour, and if the continuous 5 calculation difference values are all smaller than 1K, the calculation is carried out
Wherein,th2、th3、th4、th5for the 5 consecutive temperature data the number of temperature data,th2-1、th3-1、th4-1、 th5-1for the 5 consecutive temperature data the number of temperature data,andat intervals of 1 hour, th2And th2-1At intervals of 1 hour, th3And th3-1At intervals of 1 hour, th4And th4-1At intervals of 1 hour, th5And th5-1Spaced apart by 1 hour. If the 5 inequalities in the formula (3) are all true, the PLC judges that the test is finished (or the test is called as the number of different temperature data can be selected according to different tested electrical equipment). The PLC performs operation processing on the temperature value data to obtain a temperature rise test result of the tested electrical equipment 7 (the 1 st data with the calculation difference value smaller than 1K-the test environment temperature +40 ℃), sends a control instruction to the alternating current contactor 11 to cut off test current output and data input of the thermocouple, the current transformer 15 and the like (the time relay records data to stop, and simultaneously feeds back test time data to the PLC), otherwise, the temperature rise test is continued. The PLC calls the internal big database, and the qualification of the temperature rise test of the detected electrical equipment 7 is judged according to the requirement value about the temperature rise, the uncertainty of the detection result and the test result in the relevant standard of the detected electrical equipment 7 (the test result is qualified if the requirement value is less than or equal to the standard requirement value, and the test result is unqualified if the requirement value is greater than the standard requirement value). And simultaneously recording, displaying, storing and printing the temperature rise test result of the tested electrical equipment 7.
The foregoing is only a preferred embodiment of the present invention, and many variations in the specific embodiments and applications of the invention may be made by those skilled in the art without departing from the spirit of the invention, which falls within the scope of the claims of this patent.
The foregoing is only a preferred embodiment of the present invention, and many variations in the specific embodiments and applications of the invention may be made by those skilled in the art without departing from the spirit of the invention, which falls within the scope of the claims of this patent.

Claims (10)

1. Electric equipment temperature rise current tracking adjustment verifying attachment, its characterized in that: the device comprises a PLC unit, an analog-to-digital conversion unit, a large current generating device, a voltage regulating power supply, detected electrical equipment, a motor mechanism, an electromagnetic relay A, an electromagnetic relay B, an alternating current contactor, a thermocouple group A, a thermocouple group B, a current transformer, a range automatic identification unit, power distribution equipment, a voltage transformer group and a memory;
the output end of the distribution equipment is connected with the input end of a voltage-regulating power supply through an alternating current contactor, the output end of the voltage-regulating power supply is connected with the input end of a large-current generating device, connecting terminals of detected electrical equipment are respectively connected with connecting terminals of the large-current generating device, the output voltage regulating end of the voltage-regulating power supply is connected with a main shaft of a motor mechanism, the control signal input end of the motor mechanism is connected with the output ends of an electromagnetic relay A and an electromagnetic relay B, the electromagnetic relay A and the electromagnetic relay B are used for current regulation, the electromagnetic relay A and the electromagnetic relay B work independently and do not attract at the same; when the electromagnetic relay B is switched on, the current is reduced; the action signal input ends of an electromagnetic relay A and an electromagnetic relay B are connected with the signal output end of a PLC unit, the measuring ends of a thermocouple group A and a thermocouple group B are respectively connected with the surface of the electrical equipment to be tested and the test environment, the signal output ends of the thermocouple group A and the thermocouple group B are connected with the signal input end of an analog-to-digital conversion unit, the measuring end of a current transformer is connected with a temperature rise test loop, the signal output end of the current transformer is connected with the signal input end of the analog-to-digital conversion unit, the input end of a range automatic identification unit is connected with the signal output end of the PLC unit, the output end of the range automatic identification unit is connected with different range gears of the current transformer, the measuring end of a voltage transformer group is connected with the primary side and the secondary side of a voltage regulating power, the signal output end of the analog-to-digital conversion unit is connected with the signal input end of the PLC unit, the control signal input end of the alternating current contactor is connected with the signal output end of the PLC unit, and the signal communication end of the memory is connected with the communication end of the PLC unit.
2. The electrical equipment temperature-rise current tracking adjustment checking device according to claim 1, characterized in that: the automatic range identification unit comprises a range identification processor and an electromagnetic relay group, the electromagnetic relay group comprises a plurality of electromagnetic relays, the current transformer is provided with a plurality of ranges, the signal output end of the PLC unit is connected with the signal input end of the range identification processor, the control signal output end of the range identification processor is connected with the control signal input end of the electromagnetic relay group, and the number of the electromagnetic relays in the electromagnetic relay group corresponds to the range in the current transformer so as to automatically select the range in the current transformer through the electromagnetic relays.
3. The electrical equipment temperature-rise current tracking adjustment checking device according to claim 1, characterized in that: the temperature rise current tracking adjustment and inspection device for the electrical equipment further comprises a humidity sensor, an air pressure sensor and an air speed sensor, wherein signal output ends of the humidity sensor, the air pressure sensor and the air speed sensor are connected with a signal input end of the analog-to-digital conversion unit.
4. The electrical equipment temperature-rise current tracking adjustment checking device according to claim 1, characterized in that: the temperature rise current tracking adjustment and inspection device for the electrical equipment further comprises a display screen, a control panel, an industrial computer and a printer, wherein the signal input end of the display screen is connected with the signal output end of the PLC unit; the signal output end of the control panel is connected with the signal input end of the PLC unit, the communication port of the industrial computer is connected with the communication signal port of the PLC unit, and the printing signal output end of the industrial computer is connected with the data input end of the printer.
5. The electrical equipment temperature-rise current tracking adjustment checking device according to claim 1, characterized in that: the power distribution equipment comprises a protection cabinet and a power distribution cabinet, wherein the main loop output end of the power distribution cabinet is connected with the main loop input end of the protection cabinet, and the main loop output end of the protection cabinet is connected with the input end of a voltage regulating power supply through an alternating current contactor; the emergency stop control system is characterized in that the power distribution cabinet and the protection cabinet are respectively provided with an emergency stop signal input terminal, and the output ends of the emergency stop button A and the emergency stop button B are respectively connected with the emergency stop signal input terminals of the power distribution cabinet and the protection cabinet.
6. The temperature rise current tracking, adjusting and checking method for the electrical equipment is characterized by comprising the following steps of: comprises the following steps of (a) carrying out,
step 1, starting a temperature rise test environmental parameter measuring sensor of the tested electrical equipment, collecting wind speed, temperature, humidity and atmospheric pressure data of a test environment, and displaying and storing the data;
step 2, controlling an operation panel button to electrify the operation table, adjusting test current, introducing the test current to the detected electrical equipment, observing whether the working state of the electrical equipment is normal or not, and searching the highest point of the surface temperature by using a thermal imager;
step 3, cutting off the test current, fixing a thermocouple at the highest point of the surface temperature of the detected electrical equipment by using an adhesive method, placing the thermocouple for measuring the ambient air temperature at the position of about 1m and half of the height of the detected electrical equipment, starting a temperature rise current tracking adjustment detection device of the detected electrical equipment, introducing the test current, detecting the actual test current value in real time, and automatically tracking and adjusting the current until the actual test current value is lower than the standard specified test current value;
step 4, acquiring, calculating and storing thermocouple feedback data in real time, carrying out comprehensive comparison and analysis on the data, judging that the test is finished when the difference value of two temperature data separated by one hour is less than 1K;
and 5, cutting off the test current, and calling the database data to judge the qualification of the temperature rise test result of the tested electrical equipment.
7. The electrical equipment temperature-rise current tracking adjustment checking method according to claim 6, characterized in that: in step 2, the method further comprises
And step 21, when the test current is introduced, the range automatic identification unit identifies the magnitude of the test current, the range of the current transformer is automatically selected according to the magnitude of the test current, and the test precision of the current is improved.
8. The electrical equipment temperature-rise current tracking adjustment checking method according to claim 6, characterized in that: in step 3, a step 31 is further included, in which when the surface temperature of the electrical device to be tested and the test environment change, the test loop current changes, and the voltage of the voltage-regulating power supply is adjusted to keep the test current constant, wherein the step 31 includes the following steps:
311, collecting the current value of the detected electrical equipment;
step 312, subtracting the collected test current value of the detected electrical equipment from a preset current value and performing absolute value calculation;
313, judging whether the absolute value of the difference value between the collected tested electrical equipment test current value and a preset current value is smaller than F, and returning to 311 if the difference value result is smaller than F; if the difference result is greater than or equal to F, go to step 314;
step 314, adjusting the test current by adjusting the voltage of the voltage-regulating power supply;
step 315, judging whether the difference value between the acquired current value of the detected electrical equipment and the preset current value is smaller than H, if the difference value result is smaller than H, ending the adjustment of the current introduced by the current introduced once, and returning to the step 311; if the difference result is greater than or equal to H, return to step 314(H < F).
9. The electrical equipment temperature-rise current tracking adjustment checking method according to claim 6, characterized in that: in step 4, before the data are comprehensively compared and analyzed, step 41 is performed to eliminate the interference data in the acquired temperature data, wherein step 41 comprises
Step 411, acquiring n data in a single calculation period of the temperature data;
step 412, calculating the change rate T of the surface temperature data of the detected electrical equipment, wherein the change rate T satisfies the formula T ═ Tj-tj-1Wherein t isj-tj-1The difference value of two adjacent acquisition temperatures;
step 413, calculate the average of the rate of change TMean value ofSatisfy the formulaWherein i is an integer, and i is 1, 2, 3, … n,the average value of the n temperature data change rates in a single calculation period is obtained;
step 414, verifying the collected temperature data tnIf, ifWhere P is the temperature value change rate difference comparison coefficient, then tnIf true value data is obtained, recording, displaying and storing the true value data as temperature test data; if not satisfied withReject tnData and proceed to step 415;
step 415, re-estimating t according to the temperature rise test data and the data change rate acquired in the previous M timesnData are recorded as tnMaking a temperature change rate difference comparison to determine, e.g. usingThen consider tnThe data is true value data, which is recorded, displayed and stored as temperature rise test data.
10. The electrical equipment temperature-rise current tracking adjustment checking method according to claim 9, characterized in that: in step 4, step 41 is followed by: and 42, judging a temperature rise result after the temperature rise test data is recorded for 1 hour, wherein the step 42 comprises the following steps:
step 421, retrieving the effective temperature data of the detected electrical equipment recorded in step 415;
step 422, calculating the difference between the current temperature data and the effective temperature data which is spaced for 1 hour, and importing the difference into a formulaIf the 5 inequalities in the formula (3) are all true, judging that the test is finished, and judging the qualification of the temperature rise test of the detected electrical equipment according to the required value about the temperature rise in the relevant standard of the detected electrical equipment, the uncertainty of the detection result and the test result; if any of the inequalities in the formula (3) is not satisfied, the process returns to step 421, and the temperature rise test is continued.
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