CN202600073U - Safety failure monitoring device for electric equipment - Google Patents
Safety failure monitoring device for electric equipment Download PDFInfo
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- CN202600073U CN202600073U CN 201220228374 CN201220228374U CN202600073U CN 202600073 U CN202600073 U CN 202600073U CN 201220228374 CN201220228374 CN 201220228374 CN 201220228374 U CN201220228374 U CN 201220228374U CN 202600073 U CN202600073 U CN 202600073U
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Abstract
The utility model discloses a safety failure monitoring device for electric equipment. The safety failure monitoring device for the electric equipment comprises a first monitoring unit and a microcontroller unit, wherein the first monitoring unit is connected into a main loop of the electric equipment, and is used for monitoring an insulation resistance of the electric equipment in a non-running state, and outputting a first analog signal which can reflect the variation of the insulation resistance of the electric equipment in the non-running state; and the microcontroller unit is used for outputting a pulse width modulation signal to the first monitoring unit, and receiving the first analog signal and processing the signal. With adoption of the safety failure monitoring device for the electric equipment, the insulation condition of the electric equipment can be early monitored on line.
Description
Technical field
The utility model relates to the electrical equipment safety monitoring, more specifically, is a kind of electrical equipment fail safe supervising device that can monitor the insulation resistance of electrical equipment in each state.
Background technology
In the using electricity system; The security of each parts of electrical equipment, for example motor, transformer, electric wiring etc. have considerable influence to the safe operation of electrical equipment; Therefore; Need monitor parameters such as the electrical insulation properties of electrical equipment, leakage currents,, avoid the generation of electrical malfunction and personal safety accident to guarantee the security of operation of electrical equipment.
Than under the bad working environment; For example place such as mine, down-hole owing to factor affecting such as a large amount of existence of dust and humid environments, causes electric equipment failure rate to increase greatly; Especially the insulation resistance influence to motor windings is bigger; If can continue to monitor to the insulation of electrical installation situation, then can find the inefficacy of insulation of electrical installation effectively, therefore need to adopt special method and apparatus.
In disclosed document; U.S. Pat 6,327,124B1 discloses a kind of low current earth-fault relay (LOW CURRENT GROUND FAULT RELAY); It can be monitored the leakage current in the motor operation process; To guarantee motor and personal safety, simultaneously, a kind of scheme of motor windings being carried out the insulation resistance monitoring is provided also.Granted publication number is the static insulation of a kind of high-voltage motor watch-dog for the Chinese utility model patent of CN201628746U discloses; Through high-voltage power supply generation circuit, relay, I/V modular converter and programmable gain amplifier; Insulation resistance to the motor stator winding of high-voltage motor under stopped status detects; And input to after a CUP handles, the insulating resistance value after measuring is outputed to display circuit show.
The utility model content
A purpose of the utility model is to provide a kind of electrical equipment fail safe supervising device that can realize electrical equipment is carried out early stage insulation resistance monitoring, so that the state of insulation of electrical equipment before work monitored.
Another purpose of the utility model is to provide a kind of electrical equipment fail safe supervising device that can realize electrical equipment is carried out online insulation resistance monitoring, so that the state of insulation in the electrical equipment course of work is monitored.
A purpose again of the utility model is to provide a kind of and can realizes that the leakage current to electrical equipment circuit of living in carries out the electrical equipment fail safe supervising device of on-line monitoring.
For achieving the above object, the utility model provides a kind of electrical equipment fail safe supervising device, comprising:
First monitoring means, this first monitoring means inserts the major loop of electrical equipment, be used for to this electrical equipment not the insulation resistance during duty monitor, and output reflects this electrical equipment first simulating signal that insulation resistance does not change during duty; And
Micro controller unit, this micro controller unit receives this first simulating signal to the first monitoring means output pulse width modulation signal, and this first simulating signal is carried out signal Processing;
Wherein, This first monitoring means comprises the high pressure generator and first detecting signal unit; This high pressure generator utilizes the pulse-width signal of this micro controller unit output; The major loop of test voltage to this electrical equipment of output; And the major loop of this electrical equipment reflects this electrical equipment coupled signal that insulation resistance does not change during duty to this first detecting signal unit through one of this high pressure generator output, and this this first simulating signal of first detecting signal unit output is to this micro controller unit.
Preferably, said high pressure generator comprises the voltage-regulation unit, the boost loop and first isolated location, wherein,
This voltage-regulation unit receives said pulse-width signal, will be delivered to the loop of boosting through the voltage after regulating, and will be delivered to said first detecting signal unit by the said coupled signal that this loop of boosting receives;
This loop of boosting receives the voltage after regulating that this voltage-regulation unit sends, the processing of boosting;
This first isolated location is used to isolate the major loop and this loop of boosting of this electrical equipment, and exports said test voltage to the major loop of this electrical equipment.
Preferably, the said loop of boosting is a step-up transformer, comprises elementary winding and secondary winding, and wherein, this elementary winding is connected with this voltage-regulation unit, and this secondary winding is in series with a divider resistance, and is connected with this first isolated location.
Preferably; Second monitoring means that also comprises insulation resistance when being used to monitor this electrical equipment duty; This second monitoring means is connected with the major loop of this electrical equipment, and second simulating signal that insulation resistance changes when said micro controller unit output reflects this duty.
Preferably, said second monitoring means comprises second isolated location and the secondary signal detecting unit that is connected with this second isolated location.
Preferably; Also comprise the leakage current detecting unit; This leakage current detecting unit comprises current transformer that is arranged in this electrical equipment major loop and the signal condition unit that is connected with this current transformer; This signal condition unit is to this micro controller unit output leakage current detection signal, and this signal condition unit comprises a sampling resistor and the operational amplifier that is connected with this sampling resistor.
Preferably, comprise that also the status display unit, fault remote alarms unit, the system that are connected with said micro controller unit respectively are provided with unit and test/reset unit.
The electrical equipment fail safe supervising device of the utility model; Can realize early stage and on-line monitoring to the insulation of electrical installation situation; Make the user be able to the situation of finding that early electrical equipment such as electrical machine insulation descend; Insulation of electrical installation fault to be detected is in time handled, guaranteed the safe operation of consumer.
Description of drawings
Fig. 1 is the composition synoptic diagram of the electrical equipment fail safe supervising device of the utility model;
Fig. 2 is the electrical equipment fail safe supervising device circuit diagram in one embodiment of the utility model;
Fig. 3 utilizes the utility model to carry out the schematic flow sheet of electrical equipment fail safe monitoring.
Embodiment
Below through accompanying drawing and embodiment, the electrical equipment fail safe supervising device of the utility model is elaborated.
Generally speaking, through the electrical equipment fail safe supervising device of the utility model, can monitor insulation resistance and leakage current under each state of electrical equipment.In the utility model, this electrical equipment can be industrial electric equipment, and for example motor of various industrial occasions etc. also can be a household electricity gas equipment, for example water heater etc.
Particularly, as shown in Figure 1, be the composition synoptic diagram of the electrical equipment fail safe supervising device of the utility model, in conjunction with Fig. 1, the electrical equipment fail safe supervising device of the utility model comprises first monitoring means 100 and micro controller unit 200.First monitoring means 100 inserts the major loop of electrical equipments 10, be used for to electrical equipment 10 not the insulation resistance during duty monitor, and output reflects this electrical equipment first simulating signal that insulation resistance does not change during duty.Micro controller unit 200 receives this first simulating signal to the first monitoring means output pulse width modulation signal 202 (PWM), and this first simulating signal is carried out signal Processing.
In conjunction with Fig. 1, first simulating signal is a simulating signal, and it can be voltage signal or current signal; And can insert an analog to digital conversion (A/D conversion) end 204 of micro controller unit 200, carry out analog to digital conversion, then; Micro controller unit 200 is further handled first simulating signal after this process analog to digital conversion; The insulating resistance value of electrical equipment when drawing duty not, and according to this insulating resistance value, carry out outputs such as state demonstration, remote alarms and handle.
Further; First monitoring means 100 comprises the high pressure generator 110 and first detecting signal unit 120; High pressure generator 110 utilizes the pulse-width signal 202 of micro controller unit 200 outputs; The major loop of test voltage a to electrical equipment 10 of output; And the major loop of electrical equipment 10 reflects this coupled signal to the first detecting signal unit 120, the first detecting signal units 120 these first simulating signal to micro controller units 200 of output that insulation resistance does not change during duty through one of high pressure generator 110 output.
In conjunction with Fig. 2, in this embodiment, electrical equipment 10 is a motor unit, and first monitoring means 100 of insulation resistance can pass through a normally closed switch K1_1 when monitoring duty not, inserts the major loop of electrical equipment.
As shown in Figure 1, high pressure generator 110 comprises voltage-regulation unit 111, the boost loop 112 and first isolated location 113, and wherein, voltage-regulation unit 111 receives pulse-width signal 202, and will be delivered to the loop 112 of boosting through the voltage after regulating; Boost loop 112 receives the voltage after regulating that voltage-regulation unit 111 send, the processing of boosting, and through the above-mentioned coupled signal of loop 112 generations that boosts; First isolated location 113 is used to isolate the major loop of electrical equipment 10 and the loop 112 of boosting, and exports test voltage to the major loop of electrical equipment 10.
More specifically, in conjunction with Fig. 1,2, through changing pulse-width signal 202; Voltage-regulation output that can regulation voltage regulon 111, the loop of boosting this voltage-regulation output capable of using, the processing of boosting; To obtain a high voltage; Preferably, this high-tension scope is between the 1000V-1500V, and this high voltage can guarantee to detect and obtain insulating resistance value accurately.In embodiment shown in Figure 2; The main building block of voltage-regulation unit 111 is a metal-oxide-semiconductor; First pin (grid) of this metal-oxide-semiconductor is connected with the PWM port of microprocessor unit 200 through a resistance R 8, and promptly the switching frequency of metal-oxide-semiconductor receives the control of the PWM pulse-width signal of CPU.In addition; Be parallel with a reverse sustained diode 9 between second pin (drain electrode) of this metal-oxide-semiconductor and the three-prong (source electrode); Diode D9 is used to prevent produce too high reverse voltage between second pin and the three-prong of metal-oxide-semiconductor, also can improve the switching speed of metal-oxide-semiconductor simultaneously.
Continuation is with reference to Fig. 1,2; The loop 112 of boosting is a step-up transformer T, and it comprises elementary winding and secondary winding, and wherein elementary winding is connected with this voltage-regulation unit; This secondary winding is in series with a divider resistance R4, and is connected with this first isolated location.More specifically, an end of this elementary winding is connected with second pin (drain electrode) of metal-oxide-semiconductor, is used to receive the output signal that comes from voltage-regulation unit 111, and the other end of elementary winding is connected with the 24V voltage source; One end of secondary winding (being the high-pressure side) is through this divider resistance R4 ground connection, and the other end is connected to the major loop of electrical equipment 10 through first isolated location 113.In embodiment shown in Figure 2, in fact first isolated location 113 is made up of capacitor C 1, the C2 of two parallel connections, is series between the normally closed switch K1_1 of high-pressure side and equipment 10 of step-up transformer T.
In embodiment shown in Figure 2; First detecting signal unit, 120 chief components are an amplifier IC1-1; Its inverting input is connected with the three-prong of metal-oxide-semiconductor through resistance R 9; In-phase input end is through resistance R 5 ground connection, and its output terminal is connected with the AD signal input port TEST3 of micro controller unit.
Thus, after the pwm signal of microcontroller control voltage-regulation unit 111 carries out voltage-regulation, the processing of boosting of the step-up transformer T in the loop 112 of boosting; Then; After the dc-isolation through first isolated location 113, test voltage is input in the major loop of electrical equipment 10, if the insulation resistance of major loop changes; Then the electric current in the major loop also will change; At this moment, this current signal can be coupled to first detecting signal unit 120 as coupled signal through step-up transformer T in the loop 112 of boosting and voltage-regulation unit 111.120 pairs of these coupled signals of first detecting signal unit carry out signal and amplify; Be processed into first simulating signal that is suitable for being input to microcontroller; Carry out signal Processing through microcontroller then, thereby realize the insulation resistance of electrical equipment under the duty is not monitored.
For the realization of the utility model, voltage-regulation unit, boost loop and first isolated location are not limited to circuit setting shown in Figure 2.For example, for the voltage-regulation unit and the loop of boosting, can adopt other voltage-regulation and boosting mode, realize voltage-regulation and the processing of boosting, the for example boosting mode of independent-excited, auto-excitation type or capacitance boost mode etc.What first isolated location 113 also can adopt other can isolated DC and the suitable configurations that only lets AC signal pass through, for example, adopts RL circuit etc.First detecting signal unit also can adopt other conventional meanses that are suitable for coupled signal is converted into the voltage signal that is suitable for the microprocessor reception.
As shown in Figure 1; The electrical equipment fail safe supervising device of the utility model also comprises second monitoring means 300 of insulation resistance when being used to monitor these electrical equipment 10 duties; Second monitoring means 300 is connected with the major loop of electrical equipment 10, and second simulating signal that insulation resistance changes when micro controller unit 300 outputs reflect this duty.Similar with first simulating signal, this second simulating signal can be a voltage signal, also can be current signal.Micro controller unit 300 receives this second simulating signal and carries out analog to digital conversion through A/D input port 206; Then; Micro controller unit 200 is further handled second simulating signal after this process analog to digital conversion; The insulating resistance value of electrical equipment when drawing duty, and according to this insulating resistance value, carry out outputs such as state demonstration, remote alarms and handle.
More specifically, second monitoring means 300 comprises second isolated location 310 and the secondary signal detecting unit 320 that is connected with this second isolated location 310.As shown in Figure 2; In this embodiment; Second isolated location 310 comprises inductance L and resistance R 1; One end of inductance L is connected with the major loop of electrical equipment 10 through a normal open switch K1_2, and the other end of inductance L is connected with the input end of secondary signal detecting unit 320, and through resistance R 1 ground connection; The secondary signal detecting unit mainly comprises an operational amplifier IC1-2, and its inverting input is connected with inductance L, and in-phase input end is through resistance R 2 ground connection, and its inverting input also is connected to a divider resistance R7.The output terminal of operational amplifier IC1-2 is connected with the A/D input end 206 (TEST2) of micro controller unit 200, is used to export second simulating signal.Understand easily, second isolated location 310 also can adopt other conventional settings that are different from scheme shown in Fig. 2 with secondary signal detecting unit 320.
In the embodiment shown in Figure 2, normal open switch K1_2 and normally closed switch K1_1 are respectively the normally open contact and the normally closed interlock of the K switch 1 of control major loop break-make.When electrical equipment 10 was not worked, K switch 1 was broken off, and normally closed switch K1_1 is closed, carried out the not insulation resistance monitoring during duty of electrical equipment 10 this moment; During electrical equipment 10 work; K switch 1 closure; Normal open switch K1_2 is closed, and normally closed switch K1_1 breaks off, and first monitoring means 100 withdraws from circuit; Guaranteed the safety of related circuit in first monitoring means 100, and second monitoring means 300 of insulation resistance drops into circuit when being used to monitor these electrical equipment 10 duties.
Further; As shown in Figure 1, the electrical equipment fail safe supervising device of the utility model also comprises leakage current detecting unit 400, in conjunction with Fig. 2; Leakage current detecting unit 400 comprises the signal condition unit 420 that is arranged at the current transformer 410 in these electrical equipment 10 major loops and is connected with current transformer 410; Signal condition unit 420 is to micro controller unit 200 output leakage current detection signals, and this leakage current detection signal is a simulating signal, through the A/D input port 208 (TEST1) of micro controller unit 200; Input to microcontroller and carry out analog to digital conversion and data processing, thereby realize monitoring leakage current.In embodiment shown in Figure 2, this signal condition unit 420 comprises a sampling resistor R3 and the operational amplifier IC1-3 that is connected with this sampling resistor R3.Particularly; Current transformer 410 is used for leakage current and detects; The inverting input of operational amplifier IC1-3 in its first end and the signal condition unit 420 is connected; The in-phase input end of operational amplifier IC1-3 in second end and the signal condition unit 420 is connected, and R3 is connected across between the inverting input and in-phase input end of operational amplifier IC1-3.The output terminal of operational amplifier IC1-3 is connected to the A/D input port 208 (TEST1) of micro controller unit 200.
As shown in Figure 2, in this embodiment, also can on the basis of aforementioned each monitoring function, expand grounded continuous monitoring function, and the A/D input port TEST4 of monitor signal through micro controller unit inputed to micro controller unit carry out data processing.In addition, in conjunction with Fig. 2, the electrical equipment fail safe supervising device of the utility model can comprise that also the status display unit 210, fault remote alarms unit 220, the system that are connected with micro controller unit 200 respectively are provided with unit 230 and test/reset unit 240.Wherein, status display unit 210 can show that fault remote alarms unit 220 can carry out remote alarms according to the change in resistance of insulation resistance to the resistance value and the variable condition of insulation resistance.System is provided with unit 230 and can regulates protection parameters such as test voltage, leakage current and delay times through the inputting interface of routine, and test/reset unit 240 is used for test and reset operation, to realize installing the self diagnosis maintenance function of itself.Further, micro controller unit 200 also can be provided with the communication interface 250 that communicates with other equipment.
As shown in Figure 3, and combine Fig. 1,2, utilize the electric equipment fail safe watch-dog of the utility model to carry out the fail safe monitoring, comprise the steps: in step S100, through micro controller unit 200 output pulse width modulation signals; In step S200, the extremely major loop of the electrical equipment 10 during duty not of a test voltage is exported in processings of boosting of this pulse-width signal control high pressure generator 110; In step S300, the major loop of electrical equipment 10 is through this high pressure generator 110, and the coupled signal of export variation of an insulation resistance when reflecting duty not is to first detecting signal unit 120; In step S400,120 pairs of these coupled signals of this first detecting signal unit are handled, and output reflects that this first simulating signal that insulation resistance does not change during duty is to this micro controller unit 200.
Description and Fig. 1,2 in conjunction with above-mentioned electrical equipment fail safe device to the utility model; In step S200; Through high pressure generator 110 processing of boosting, may further comprise the steps: said pulse width signal carries out voltage-regulation through a voltage-regulation unit 111; Boost through the loop 112 of boosting of the signal conveys to after the voltage-regulation; Signal after boosting in this loop of boosting carries out dc-isolation through first isolated location 113, and exports said test voltage.And after step S300 signal conveys to this first isolated location 113 that insulation resistance changes when comprising the steps: that the major loop of this electrical equipment 10 will reflect duty not carries out dc-isolation; Produce said coupled signal through this loop 112 of boosting, and this coupled signal is delivered to said first detecting signal unit 120.
In addition; In conjunction with Fig. 1,2,3; Like above unit describe, except that above-mentioned steps S100-S400, utilize the utility model to carry out the step of electrical equipment fail safe monitoring to the utility model; The step that insulation resistance when also comprising the electrical equipment duty is monitored; This step comprises: after the current signal of major loop carries out dc-isolation through second isolated location 310 during these electrical equipment 10 duties, detects by secondary signal detecting unit 320, and second simulating signal that insulation resistance changes when micro controller unit 200 outputs reflect duty.
And likewise; In conjunction with Fig. 1-3; Also comprise the step that the leakage current of electrical equipment is monitored; This step comprises: in the major loop of this electrical equipment 10, utilize current transformer 410 to detect leakage current signal, this leakage current signal is transported to this micro controller unit 200 after signal condition unit 420 is handled.
In sum; The electrical equipment fail safe supervising device of the utility model; Can realize early stage and on-line monitoring to the insulation of electrical installation situation; Make the user be able to the situation of finding that early electrical equipment such as electrical machine insulation descend, insulation of electrical installation fault to be detected is in time handled, guaranteed the safe operation of consumer; Have stronger expanded function, external status display unit of visual actual needs and fault remote alarms unit etc., and can carry out system's setting and test easily, operate hommization more; Simultaneously, the device circuit of the utility model is simple in structure, and antijamming capability is strong, and cost is low, is with a wide range of applications.
Claims (7)
1. an electrical equipment fail safe supervising device is characterized in that, comprising:
First monitoring means, this first monitoring means inserts the major loop of electrical equipment, be used for to this electrical equipment not the insulation resistance during duty monitor, and output reflects this electrical equipment first simulating signal that insulation resistance does not change during duty; And
Micro controller unit, this micro controller unit receives this first simulating signal, and this first simulating signal is carried out signal Processing to this first monitoring means output pulse width modulation signal;
Wherein, This first monitoring means comprises the high pressure generator and first detecting signal unit; This high pressure generator utilizes the pulse-width signal of this micro controller unit output; The major loop of test voltage to this electrical equipment of output; And the major loop of this electrical equipment reflects this electrical equipment coupled signal that insulation resistance does not change during duty to this first detecting signal unit through one of this high pressure generator output, and this this first simulating signal of first detecting signal unit output is to this micro controller unit.
2. electrical equipment fail safe supervising device according to claim 1 is characterized in that, said high pressure generator comprises the voltage-regulation unit, the boost loop and first isolated location, wherein,
This voltage-regulation unit receives said pulse-width signal, will be delivered to the loop of boosting through the voltage after regulating, and will be delivered to said first detecting signal unit by the said coupled signal that this loop of boosting receives;
This loop of boosting receives the voltage after regulating that this voltage-regulation unit sends, the processing of boosting;
This first isolated location is used to isolate the major loop and this loop of boosting of this electrical equipment, and exports said test voltage to the major loop of this electrical equipment.
3. electrical equipment fail safe supervising device according to claim 2; It is characterized in that the said loop of boosting is a step-up transformer, comprises elementary winding and secondary winding; Wherein, This elementary winding is connected with this voltage-regulation unit, and this secondary winding is in series with a divider resistance, and is connected with this first isolated location.
4. according to each described electrical equipment fail safe supervising device in the claim 1 to 3; It is characterized in that; Second monitoring means that also comprises insulation resistance when being used to monitor this electrical equipment duty; This second monitoring means is connected with the major loop of this electrical equipment, and second simulating signal that insulation resistance changes when said micro controller unit output reflects this duty.
5. electrical equipment fail safe supervising device according to claim 4 is characterized in that, said second monitoring means comprises second isolated location and the secondary signal detecting unit that is connected with this second isolated location.
6. according to each described electrical equipment fail safe supervising device in the claim 1 to 3; It is characterized in that; Also comprise the leakage current detecting unit; This leakage current detecting unit comprises current transformer that is arranged in this electrical equipment major loop and the signal condition unit that is connected with this current transformer; This signal condition unit is to this micro controller unit output leakage current detection signal, and this signal condition unit comprises a sampling resistor and the operational amplifier that is connected with this sampling resistor.
7. according to each described electrical equipment fail safe supervising device in the claim 1 to 3; It is characterized in that, comprise that also the status display unit, fault remote alarms unit, the system that are connected with said micro controller unit respectively are provided with unit and test/reset unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220228374 CN202600073U (en) | 2012-05-18 | 2012-05-18 | Safety failure monitoring device for electric equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220228374 CN202600073U (en) | 2012-05-18 | 2012-05-18 | Safety failure monitoring device for electric equipment |
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| CN 201220228374 Expired - Lifetime CN202600073U (en) | 2012-05-18 | 2012-05-18 | Safety failure monitoring device for electric equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680829A (en) * | 2012-05-18 | 2012-09-19 | 阿特拉斯科普柯(南京)建筑矿山设备有限公司 | Device and method for monitoring safe failure of electric device |
| CN105974229A (en) * | 2016-05-06 | 2016-09-28 | 国网山东省电力公司青州市供电公司 | Disconnection-free testing method for high voltage electric equipment in transformer substation |
-
2012
- 2012-05-18 CN CN 201220228374 patent/CN202600073U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680829A (en) * | 2012-05-18 | 2012-09-19 | 阿特拉斯科普柯(南京)建筑矿山设备有限公司 | Device and method for monitoring safe failure of electric device |
| CN102680829B (en) * | 2012-05-18 | 2014-09-17 | 阿特拉斯科普柯(南京)建筑矿山设备有限公司 | Device and method for monitoring safe failure of electric device |
| CN105974229A (en) * | 2016-05-06 | 2016-09-28 | 国网山东省电力公司青州市供电公司 | Disconnection-free testing method for high voltage electric equipment in transformer substation |
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