CN113933758A - Portable digital current transformer polarity detection device and method - Google Patents
Portable digital current transformer polarity detection device and method Download PDFInfo
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- CN113933758A CN113933758A CN202111113059.8A CN202111113059A CN113933758A CN 113933758 A CN113933758 A CN 113933758A CN 202111113059 A CN202111113059 A CN 202111113059A CN 113933758 A CN113933758 A CN 113933758A
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Abstract
The invention discloses portable digital current transformer polarity detection equipment and a method, wherein the detection method comprises the following steps: the detection device is configured with a detection scheme; the detection device transmits the configured detection scheme to the current generation device through wireless communication; the current generating device reads the configured detection scheme, and starts to detect and output the primary side current according to the detection scheme; after the current occurs, the current is acted to the secondary side through the current transformer; a wave collecting and recording module of the detection device reads current data of a secondary side of the current transformer; a data processing unit of the detection device analyzes current data of the secondary side of the current transformer and displays the current data on a human-computer interface; observing secondary loop pulse current phase difference according to a set pulse generation condition; and comparing the current phase difference in the detection scheme with the detection result to obtain a polarity judgment conclusion. The invention realizes a flexible polarity detection scheme, and has convenient implementation and strong operability.
Description
Technical Field
The invention belongs to the technical field of primary and secondary tests of transformer substations, and particularly relates to polarity detection equipment.
Background
The intelligent substation is widely concerned by people as an important support link of an intelligent power grid. Compared with the traditional transformer substation, the intelligent transformer substation has the technical characteristics of total-station information digitization, communication platform networking, information sharing standardization, advanced application interaction and the like. Under the technical characteristics, new requirements are provided for the reliability of the overhaul work of the intelligent transformer substation. Meanwhile, because direct current transmission and new energy power generation are connected in a large number, the power electronic characteristics of the power grid are obvious, the basic construction of a booster station, a converter station, a traction station and the like of the power plant is completed step by step, follow-up maintenance work needs to be classified and developed on time, and higher requirements are provided for the equipment maintenance efficiency under a novel power system.
The current transformer utilizes the electromagnetic induction characteristic to convert secondary small current to map a large current state on the primary side, and has the advantages of safety, accuracy, rapidness, convenience and the like. The secondary current and voltage loop is used as a signal source of the intelligent substation protection and measurement and control system to provide measurement and relay protection current and voltage for the substation relay protection and measurement device, and the functions of monitoring and protecting the operation of the power system are achieved. In a traditional transformer substation, signals are transmitted by analog quantity, and digital quantity is adopted to replace analog quantity in an intelligent transformer substation to realize monitoring of secondary current and voltage loops. The wiring correctness of the current and voltage secondary circuits of the intelligent substation has direct influence on the reliable operation of the intelligent substation.
When the secondary current and voltage loops have wiring errors or defects, the substation relay protection equipment is easily mistakenly operated and refused to operate, a power failure accident is caused, and a more serious interlocking power grid reaction can be caused. Moreover, equipment damage and personal accidents caused by open circuit of the current transformer are frequent in history. Therefore, in the case of an intelligent substation, after new construction and transformation, changes related to the secondary circuits of the current transformers must be detected before commissioning, and careful inspection and testing must be performed on each group of secondary circuits of the current transformers in the substation before power transmission to ensure that each current circuit is connected correctly and the polarity of the current transformers is correct.
There are three common methods for checking polarity, which are:
1. the direct current method mainly adopts a direct current source and a universal meter. The equipment for realizing polarity verification by the method is simple, but is limited by the reliability of a direct current source, a multimeter and wiring;
2. and in the alternating current method, a primary through-current method interconnects a first side coil and a second side coil of the current transformer, an alternating current voltage is input into the secondary side, and a voltmeter is used for measuring and processing numerical values. When the CT is operated in a steady-state mode, only the mutual relation of the polarities of a plurality of CTs can be verified, and the correctness of the polarity of a single CT cannot be judged. The method is limited in that the introduced alternating voltage is generally station-used variable or station-internal unidirectional voltage, and cannot be adjusted, and meanwhile, the error can be increased or decreased due to the selection of a voltmeter;
3. the instrument method adopts a current transformer calibrator for detection, and a result is directly obtained according to the designed wiring. The method has small workload, and the current transformer calibrator has a polarity detection function but is not a special polarity detection tool. The method is a method which is applied more at present.
The current transformer carries out the problem that maintenance work exists:
1. according to the typical design of an intelligent substation, secondary windings of current transformers in the substation are not located at the same position, communication equipment is required for communication when the intelligent substation works, and the reliability is limited;
2. according to typical design of an intelligent substation, a primary current transformer, a secondary winding and related equipment in the substation are not in the same position, primary current and secondary current cannot be connected into the same measuring equipment, but the distance is limited, the test wiring is too long, and the uncertainty of detection is increased;
3. in the polarity detection process of the current transformer, because the wiring is too long, a detection worker may cause the reverse connection of the positive and negative electrode meter pens of the polarity meter due to misoperation, and then a reverse conclusion is obtained;
4. in the polarity detection process of the current transformer, the workload of phase change and line change is large, the steps are low in working efficiency and complicated, and the operation and maintenance labor cost is seriously restricted.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problem to be solved by the invention is to provide portable digital current transformer polarity detection equipment and a method, which can be portable, synchronously acquire primary and secondary currents, access the same measurement equipment and quickly detect the correctness of a secondary side loop.
In order to solve the technical problems, the invention adopts the following technical scheme:
in one aspect, a portable digital current transformer polarity detection device is provided, which comprises a current generation device and a detection device, wherein the current generation device is arranged on a primary side of a current transformer, and the detection device is arranged on a secondary side of the current transformer;
the current generating device is provided with a current generating module, a detection output module and a first wireless communication module, wherein the current generating module generates low pulse current, the low pulse current is output by the detection output module and transmitted to the primary side of the current transformer, and then is connected with the secondary side of the current transformer in parallel;
the detection device is provided with a power supply adaptation module, a man-machine interaction module, a collection and recording module and a second data processing module, wherein the power supply adaptation module is used for providing a power supply for the detection device, the man-machine interaction module is used for realizing man-machine interaction, the collection and recording module is used for carrying out low-pass filtering setting on pulse current returned from the secondary side of the current transformer and transmitting the pulse current to the second data processing module, and the second data processing module is used for analyzing the current data of the secondary side of the current transformer and displaying the current data on a man-machine interface;
the current generating device and the detecting device realize wireless communication through a first wireless communication module and a second wireless communication module.
Preferably, the current generating device is further provided with a first data processing module, which is used for receiving the test scheme sent by the detecting device received by the first wireless communication module, and sending the start and stop instructions to the current generating module according to the set trigger time.
Preferably, the current generating device is further provided with a first fault monitoring module for monitoring and fault protecting the current generating device in the detection process.
Preferably, the current generation module uses a battery as a low pulse current generation source.
Preferably, the output current of the detection output module is 0.5-5ADC pulse current, the pulse width is 10-100ms, and the number of output paths is 3 paths of output with independent common ends.
Preferably, the current generating device is rectangular in shape, the external dimension is 180 × 120 × 60mm, and the external panel is provided with an output connecting terminal, a wireless communication antenna, a charging socket, a power switch and a status indicator lamp.
Preferably, the detection device is provided with a second fault monitoring module for monitoring the internal state of the detection device and protecting faults.
Preferably, the input current of the collecting and wave recording module is 0-0.2Arms, and the number of input paths is 3 isolated inputs.
Preferably, the detection device is rectangular, the external dimension is 180 × 120 × 60mm, the front panel is provided with an input wiring terminal, a wireless communication antenna, a charging socket, a power switch and a status indicator lamp, and the side panel is provided with a touch display of a human-computer interaction module.
In another aspect, a method for detecting a polarity of a portable digital current transformer is provided, where the method for detecting a polarity of a portable digital current transformer by using the apparatus for detecting a polarity of a portable digital current transformer includes the following steps:
the detection device is configured with a detection scheme;
the detection device transmits the configured detection scheme to the current generation device through wireless communication;
the current generating device reads the configured detection scheme, and starts to detect and output the primary side current according to the detection scheme; after the current occurs, the current is acted to the secondary side through the current transformer;
a wave collecting and recording module of the detection device reads current data of a secondary side of the current transformer;
a data processing module of the detection device analyzes current data of the secondary side of the current transformer and displays the current data on a human-computer interface; observing secondary loop pulse current phase difference according to a set pulse generation condition;
and comparing the current phase difference in the detection scheme with the detection result to obtain a polarity judgment conclusion.
According to the technical scheme, the wireless communication module is adopted, the traditional current transformer is divided in function, the current generating device and the detecting device are distributed, synchronous data transmission and polarity test are carried out in a wireless network communication mode, and results can be fed back to an expanded remote terminal to realize a remote observation process and test results. The polarity detection method has the advantages of realizing a flexible polarity detection scheme, being convenient to implement, simple in principle, strong in operability and accurate in result, reducing field working time and reducing labor cost for operation and maintenance.
Moreover, the current generating device and the detecting device are distributed and both adopt rectangular structures, so that the portable electric power meter is convenient to carry.
The following detailed description of the present invention will be provided in conjunction with the accompanying drawings.
Drawings
The invention is further described with reference to the accompanying drawings and the detailed description below:
fig. 1 is an interaction diagram of a portable digital current transformer polarity detection device structure and internal modules;
fig. 2 is an external interface and an external view of a detecting device of a portable digital current transformer polarity detecting apparatus;
fig. 3 is an external interface and an external view of a current generating device of a portable digital current transformer polarity detection device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention carries out technical innovation aiming at the defects in the polarity detection process of the current transformer by adopting an instrument method and a primary through-flow method. The prior art implementation can be summarized as follows: a dry battery is used for supplying power to a primary loop of the current transformer, a mechanical pointer meter is used for measuring a secondary winding of the transformer, and a polarity result of the transformer is obtained through the deflection condition of the pointer meter.
The portable digital current transformer polarity detector is a portable digital special current transformer polarity detection device, as shown in fig. 1 to 3, and comprises a detection device and a current generation device, wherein the detection device and the current generation device can be remotely connected through a wireless module, so that the polarity detection work can be carried out through communication of the wireless module, and a result can be fed back to an expanded remote terminal to realize a remote observation process and a test result.
Referring specifically to fig. 1, the detection device includes: the system comprises a power supply adaptation module, a second wireless communication module, a second fault monitoring module, a man-machine interaction module, a management unit module, a collecting and recording module and a second data processing module. The management unit module is respectively connected with the second wireless communication module, the man-machine interaction module and the second data processing module; the second wireless communication module is connected with the wave collecting and recording module; the second data processing module is respectively connected with the wave collecting and recording module and the management unit module.
The power supply adaptation module is used for providing power supply for the detection device equipment and supplying power to each module for operation. The voltage of the power adapter is 5V, the charging current is adjusted in a self-adaptive mode from 1.8A to 4A, the voltage of the battery is 3.7V, and the capacity of the battery is 10 Ah.
The second wireless communication module is used for providing wireless communication service between the detection device and the current generation device. The control information sent out includes: testing scheme, real-time parameter adjustment and emergency stop. The received feedback information includes: test start time, output data value, output channel number, test stop time, battery capacity. The design power of the wireless communication module is 433M/1W, the communication distance is 1600M at the maximum in open space, the wall-through communication module is 300M, and the length of the wireless communication module is 110 mm.
The second fault monitoring module is used for detecting the internal state monitoring and fault protection of the device. The state monitoring information includes: 1. monitoring the state of a power supply adaptation module, including battery temperature monitoring, battery capacity monitoring and battery fault detection; 2. monitoring the working condition of the whole machine, including working temperature monitoring and working humidity monitoring; the fault protection mainly comprises: and the battery is protected from being overhigh in temperature.
The human-computer interaction module is used for configuring a test scheme, adjusting the output parameters of the current generating device in real time, monitoring the test process, checking the test waveform and checking the test report; the front end display of the human-computer interaction module is a touch display, and the specification is 5 inches.
The management unit module is used for receiving the testing scheme configured by the human-computer interaction module, adjusting parameters in real time and stopping emergently. The management unit module feeds back the testing process information of the man-machine interaction module, including testing process data, pulse waveform, conclusion information and the like; meanwhile, the management unit module receives the pulse information of the data processing module and displays the pulse information in the man-machine interaction module; meanwhile, the management unit module and the wireless communication module exchange information, the set test scheme is sent to the current generating device through the wireless communication module, and node information in the test returned by the wireless communication module is received.
The acquisition and wave recording module is used for performing low-pass filtering setting on the returned pulse current and transmitting the pulse current to the data processing module, so that interference caused by overlong transmission distance is avoided; the input current of the acquisition and wave recording module is 0-0.2Arms, and the number of input paths is 3 isolated paths of input.
The second data processing module is used for receiving the setting result of the acquisition wave recording module to form a wave recording file, transmitting the wave recording file to the management unit module to combine data according to the internal display requirement to form input data, and performing human-computer interface display. The data processing principle and the specific process thereof belong to the prior art.
The acquisition and recording module further comprises an attenuation circuit, an amplifier, an analog-to-digital conversion chip and a filter on hardware, and is mainly used for amplifying and filtering signals on the secondary side.
The current generating device includes: the device comprises a current generation module, a detection output module, a first data processing module, a first wireless communication module and a first fault monitoring module. The first data processing module is connected with the first wireless communication module, the current generation module and the detection output module; the current generation module is connected with the detection output module.
The current generation module is used for receiving starting and stopping instructions of the data processing module, and outputting pulse current which is transmitted to the primary side current transformer through the internal detection output module and then is connected with the secondary side current transformer to be detected in parallel. A first side and a second side of a partial transformer of portable digital current transformer polarity detection equipment are collectively called an external transformer module.
The detection output module is used for setting output according to the test scheme provided by the data processing module and receiving the setting output and the setting value of the detection scheme provided by the current generation module; the output current of the detection output module is 0.5-5ADC pulse current, the pulse width is 10-100ms, and the number of output paths is 3 paths of output with independent public ends.
The first data processing module is used for receiving the test scheme sent by the detection device received by the first wireless communication module and sending start and stop instructions to the current generation module according to the set trigger time. The first data processing module receives the test scheme sent by the detection device received by the first wireless communication module, analyzes a fixed value, outputs and stops according to the set value, and sends an output and stop instruction to the detection output module. The first data processing module sends the key node information of the detection process to the detection device through the first wireless communication module. The key node information includes: test start time, output data value, output channel number, test stop time, battery capacity. The first data processing module sends the monitoring condition of the current generating device in the detection process to the detection device through the first wireless communication module.
The first wireless communication module is used for receiving the control information sent by the detection device and feeding back the test information of the current generation device to the detection device. The control information includes: testing scheme, real-time parameter adjustment and emergency stop. The feedback information includes: testing starting time, output data value, output channel number, testing stopping time and battery capacity; the design power of the wireless communication module is 433M/1W, the communication distance is 1600M at the maximum in open space, the wall-through communication module is 300M, and the length of the wireless communication module is 110 mm.
The first fault monitoring module is used for monitoring the current generating device in the detection process. The monitoring information includes: 1. monitoring the state of a power supply adaptation module, including battery temperature monitoring, battery capacity monitoring and battery fault detection; 2. monitoring the working condition of the whole machine, including working temperature monitoring and working humidity monitoring; the fault protection mainly comprises: and the battery is protected from being overhigh in temperature.
The detection output module further comprises an amplifier and an analog-to-digital conversion chip on hardware.
As shown in fig. 2, the external panel of the inspection apparatus includes: the device comprises a detection device input wiring terminal, a device wireless communication antenna, a detection device charging socket, a detection device power switch and a status indicator lamp; the side surface comprises: a display.
The display displays information including the battery capacity and the battery temperature of the current generation device; detecting the battery capacity and the battery temperature of the device; the pulse current value, the pulse width and the waveform of the A phase, the pulse width and the waveform of the B phase, the pulse width and the waveform of the C phase and the single-phase output increase and decrease keys. Starting, stopping and configuring the virtual keys. And detecting a result key.
The connecting terminal adopts a standard 4mm safe connecting terminal;
detecting the working temperature of the device: and (3) 0-40 ℃, and the working humidity of the detection device is as follows: 20-85% rh, detection device storage temperature: -25-70 ℃, and the storage humidity of the detection device: 0-90% rh;
the outside dimension of the detection device is 120W (width) × 60H (height) × 180D (length) mm.
As shown in fig. 3, the external structure of the current generator includes: the current generation device comprises a current generation device output wiring terminal, a current generation device wireless communication antenna, a current generation device charging socket, a current generation device power switch and a status indicator lamp.
The wiring terminal adopts a standard 4mm safe wiring terminal.
Working temperature of the current generating device: 0-40 ℃, working humidity of the current generating device: 20-85% rh, storage temperature of the current generating device: -25-70 ℃, the current generating device storage humidity: 0 to 90% rh.
The outside dimension of the current generating device is 120W (width) × 60H (height) × 180D (length) mm.
A portable digital current transformer polarity detection method comprises the following steps:
the detection device is configured with a detection scheme, and the detection scheme comprises a pulse current value, a pulse width, starting time and increment;
the detection device transmits the configured detection scheme to the current generation device through wireless communication;
the current generating device reads the configured detection scheme, and starts to detect and output the current to the primary side;
after the current occurs, the current is acted to the secondary side through the current transformer;
the detection device acquires and records the wave module and reads the current data of the secondary side of the current transformer;
the detection device analyzes the current data of the secondary side of the current transformer and displays the current data on a human-computer interface;
according to the set pulse generation condition, the secondary loop pulse current interphase difference can be observed;
and comparing the current phase difference in the detection scheme with the detection result to obtain a polarity judgment conclusion.
The beneficial effects of the invention are shown in the following aspects:
1. in the social aspect:
1) the method has the advantages that an efficient polarity detection means of the current transformer of the transformer substation is provided, the debugging environment building complexity is simplified, the debugging workload is reduced, the debugging efficiency and the overhauling efficiency are greatly improved, and the working cycle of the intelligent transformer substation is shortened.
2) The intelligent transformer substation current transformer polarity detection simulation support is used for carrying out equipment polarity detection simulation, the technical level of operation and maintenance maintainers in each work area can be greatly improved, and the operation and maintenance management level of the transformer substation is integrally improved.
3) The polarity detection and evaluation means of the current transformer is provided for the operation and maintenance shortage, reconstruction and extension projects of the intelligent transformer substation, the problems and hidden dangers of the actual transformer are found in debugging and maintenance, and the long-term operation reliability of the system is guaranteed.
2. In the economic aspect:
the working rectangular surface: after the portable digital current transformer polarity detection equipment is adopted, the detection average debugging period of a three-phase transformer is shortened from original 8 hours to 4 hours by detection personnel on site, the overhauling efficiency is improved by 50 percent, and the intelligent transformer is counted by 200 intelligent transformer substations of 110 kilovolts and above in Shaoxing city power grid.
In terms of accuracy: the device adopts pulse quantity input, pulse quantity analysis replaces the historical problem of insufficient calculation accuracy of alternating current phase and phase angle of the traditional one-time through-flow method, and digital analysis is adopted to solve the problem of low precision of the traditional direct current combined device. Quantization and visual polarity judgment result display are realized.
In the aspect of service safety: the equipment adopts the battery as a low pulse generating source, shields the safety problem caused by the conventional 220V single-phase or 380V station service transformer, and has practical significance in the aspects of ensuring the safety of overhaul and operating personnel.
3. The technical aspect is as follows:
comparing the similar intellectual property:
1) CN 112858958A applies for a method for detecting the polarity of current wiring of a high standby transformer protection device. The realization technology is to start a high-power motor. The polarity verification test of the secondary current loop of the low-voltage side of the high backup transformer protection can be completed by simulating a primary current test. The method is actually used for detecting the polarity of the line after maintenance by adopting a detected reliable environment and line operation.
2) CN 112415438A applies for an automatic polarity detection device for a current transformer. The characteristics of the claim are the installation of the main body shell and the top surface and the construction of the internal components such as screw, slide block thread, rubber cushion, etc., and the focus is the structure and the appearance of the current transformer polarity automatic detection device.
3) CN 113203964 a discloses a polarity detection device for a current transformer. The implementation mode is mainly based on the principle of a current transformer detection technology, and provides a polarity detection mode of the current transformer based on different transformation ratios.
4) CN 109143143B authorizes a transformer substation current transformer secondary side polarity intelligent detection device and method. The method is a device and a method for intelligently detecting secondary side polarity of a current transformer of a transformer substation, and comprises a checking host and a plurality of acquisition terminals; the checking host comprises a first human-computer interaction module, a supervisor module, a wave collecting and recording module, an alternating current source, an internal CT and a wireless transceiving module. The output current of the AC current source is connected in parallel with the CT to be tested after flowing through the primary side of the internal CT.
Compared with the similar technology, the portable digital current transformer polarity detection equipment and the portable digital current transformer polarity detection method provided by the invention have the following specific advantages:
1) the portable design, the weight of single equipment is not more than 1.2 kg; the size of a single device is 120 Wx 60 Hx 180Dmm, the structure is square, and the device is easy to stack and carry;
2) the portable current generating device is deployed on the primary side, the portable detection device is deployed on the secondary side, and meanwhile polarity detection work is carried out, so that regional cooperative operation of polarity detection is realized;
3) the technical limitation that only the mutual relation of the polarities of a plurality of CTs can be verified and the correctness of the polarity of a single CT cannot be judged in a steady state working mode due to the space limitation of a voltage measurement method only aiming at a secondary side loop is broken through.
4. The process aspect is as follows:
integrated portable appearance: the overall dimension is 120 Wx60 Hx180 Dmm, the external structure is simple and uniform, the weight is light (the weight of a single device is not more than 1.2kg), multiple sets of devices are convenient to carry, and the operation is carried out at the same time;
the equipment is simple to use: the input wiring terminal, the wireless communication antenna, the charging socket, the power switch and the status indicator lamp are all arranged on one side of the device;
the equipment has better storage and tolerance capability: the working temperature and humidity of the equipment are 0-40 ℃/20-85% rh; storing the temperature and humidity in equipment at-25-70 ℃/0-90% rh;
the equipment design concept is innovative: the method is simple, has good operability and high accuracy.
Example 1: the method adopts a current generation device of portable digital current transformer polarity detection equipment to implement the detection example of the three-phase transformer.
Starting the detection device: long pressing of the power key for 5 seconds;
starting a current generating device, and pressing a power key for 5 seconds;
waiting for the self-checking of the system, and continuously operating after the green lamp is on after the communication is normal;
if the red light flickers to indicate that the communication is wrong, the communication condition needs to be detected, and then the detection is carried out;
respectively connecting Pa, Pan, Pb, Pbn, Pc and Pcn of the current generating device to the primary side of a three-phase current transformer of the intelligent substation by adopting standard 4mm safe connecting terminals;
respectively connecting Sa, San, Sb, Sbn, Sc and Scn of the detection device to the secondary side of a three-phase current transformer of the intelligent substation by adopting standard 4mm safety connecting terminals;
confirming that the wiring is correct;
setting a detection scheme of a touch screen interface of a detection device, and determining a detection current magnitude parameter and a pulse duration parameter;
pressing a starting key;
the current generating device sends out a set primary side pulse current;
the detection device receives pulse current returned by the secondary side;
the test results are displayed on the right side of the screen.
Example 2: the current generation device of the portable digital current transformer polarity detection equipment is adopted to implement the detection example of multiple secondary windings of a single transformer.
Starting the detection device: long pressing of the power key for 5 seconds;
starting a current generating device, and pressing a power key for 5 seconds;
waiting for the self-checking of the system, and continuously operating after the green lamp is on after the communication is normal;
if the red light flickers to indicate that the communication is wrong, the communication condition needs to be detected, and then the detection is carried out;
respectively connecting Pa, Pan or Pb, Pbn or Pc and Pcn of the current generating device to the primary side of a three-phase current transformer of the intelligent substation by adopting standard 4mm safe connecting terminals;
respectively connecting Sa, San, Sb, Sbn, Sc and Scn of the detection device to the secondary side of a three-phase current transformer of the intelligent substation by adopting standard 4mm safety connecting terminals;
confirming that the wiring is correct;
setting a detection scheme of a touch screen interface of a detection device, and determining a detection current magnitude parameter and a pulse duration parameter;
pressing a starting key;
the current generating device sends out a set primary side pulse current;
the detection device receives pulse current returned by the secondary side;
the test results are displayed on the right side of the screen.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in other forms without departing from the spirit or essential characteristics thereof. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111113059.8A CN113933758A (en) | 2021-09-23 | 2021-09-23 | Portable digital current transformer polarity detection device and method |
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| CN202111113059.8A CN113933758A (en) | 2021-09-23 | 2021-09-23 | Portable digital current transformer polarity detection device and method |
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| CN118151060A (en) * | 2024-05-09 | 2024-06-07 | 国网山东省电力公司淄博供电公司 | Current transformer polarity testing device and testing method |
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