CN207623505U - Mutual inductor detection device - Google Patents
Mutual inductor detection device Download PDFInfo
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- CN207623505U CN207623505U CN201721501306.0U CN201721501306U CN207623505U CN 207623505 U CN207623505 U CN 207623505U CN 201721501306 U CN201721501306 U CN 201721501306U CN 207623505 U CN207623505 U CN 207623505U
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- 238000001514 detection method Methods 0.000 title abstract description 24
- 238000012360 testing method Methods 0.000 claims description 54
- 238000012512 characterization method Methods 0.000 claims description 21
- 238000005259 measurement Methods 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 abstract description 7
- 238000012031 short term test Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 2
- 208000032368 Device malfunction Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
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Abstract
The utility model provides a mutual inductor detection device, which comprises a voltage detection circuit, a self-checking circuit and a micro control unit; the voltage detection circuit is respectively and electrically connected with the detected mutual inductor CT1, the self-checking circuit and the micro control unit; the self-checking circuit is respectively and electrically connected with the detected mutual inductor CT1, the voltage detection circuit and the micro control unit. Adopt detection device can promote the accuracy that the mutual-inductor state detected, normal, the open circuit or the short circuit state of mutual-inductor among the detection distribution system that can be quick and accurate, when carrying out mutual-inductor assembly and maintenance in distribution system, can make things convenient for maintenance personnel to carry out short-term test, avoids artificial mistake, improves work efficiency, improves distribution system's security and reliability.
Description
Technical field
The utility model belongs to electrical equipment detection technique field, and in particular to a kind of mutual inductor testing apparatus.
Background technology
In distribution system, generally use mutual inductor (current transformer, CT) is used as current sample element, carries
Monitoring and controlling terminal is given for corresponding current signal, is protected or is measured with the protection equipment of power supply-distribution system and be used.Although
The possibility of transformer circuit open circuit or short circuit is smaller, but mutual inductor will cause power distribution system once open circuit or short trouble occurs
The relay protection of system or automatic device malfunction, such as trip, to cause supply of electric power to interrupt, therefore in order to improve power distribution system
Reliability of uniting and safety ensure safe operation of power system, it is necessary to be detected to the open circuit or short trouble of mutual inductor
And identification, while needing to promote the accuracy detected, therefore the utility model provides a kind of mutual inductor testing apparatus, it can be fast
Speed and accurately detection mutual inductor state.
Utility model content
The purpose of the utility model is to provide a kind of mutual inductor testing apparatus, for fast and accurately detecting mutual inductance
Device state.
To realize that above-mentioned purpose of utility model, the utility model provide a kind of mutual inductor testing apparatus, including voltage inspection
Slowdown monitoring circuit, self-checking circuit and micro-control unit (Micro Control Unit, MCU)；The voltage detecting circuit respectively with quilt
Detect mutual inductor CT1, self-checking circuit and micro-control unit electrical connection；The self-checking circuit respectively with detected mutual inductor CT1, electricity
Press detection circuit and micro-control unit electrical connection.
Further, the voltage detecting circuit, including Current Transmit 2, resistance R1, resistance R2 and voltage measurement mould
Block, the resistance R1 and R2 are electrically connected with voltage measurement module respectively, and the voltage measurement module is electrically connected with the microcontrol unit.
Further, the first terminals electricity of the first input end of the Current Transmit 2 and detected mutual inductor CT1
Connection, the second input terminal of the Current Transmit 2 are electrically connected with self-checking circuit.
Further, the first output end of the Current Transmit 2 is electrically connected with resistance R1, the current transformer
The second output terminal of CT2 is electrically connected with resistance R2.
Further, the self-checking circuit, including the first relay Y1, the second relay Y2, sampled point ADT, resistance R3
It is electrically connected with the microcontrol unit respectively with power supply AVCC, the first relay Y1, the second relay Y2 and sampled point ADT, institute
The one end for stating resistance R3 is electrically connected with power supply AVCC, and the other end of resistance R3 is electrically connected with sampled point ADT, and the power supply AVCC is used
In the reference voltage V for providing sampled point ADTREF。
Further, the first relay Y1 includes the first contact and the second contact, and initial normal condition is first tactile
Point and the second contact access failure；The second relay Y2 includes third contact, the 4th contact and the 5th contact, initial normal shape
State is the 5th contact and the 4th contacting.
Further, the of first contact ground, second contact and the 4th contact and detected mutual inductor CT1
Two terminals are electrically connected, and the third contact is electrically connected with sampled point ADT, and the of the 5th contact and Current Transmit 2
Two input terminals are electrically connected.
Further, the micro-control unit is used to detect the sample amplitude when reproduced of sampled point ADT, and according to sample amplitude when reproduced
With reference voltage VREF, the testing result of output characterization mutual inductor testing apparatus state.
Optionally, the micro-control unit can be STM32F207ZGT6 micro-control units, or tms320c32
Or STC51 series micro-control units, it is not limited thereto；Specifically, the micro-control unit includes：
First detection module compares microcontroller list when the second relay Y2, which is attracted, connects the 5th contact with third contact
The sample amplitude when reproduced that member is detected and reference voltage VREFIf sample amplitude when reproduced is more than m* reference voltages VREF, then characterization is exported
First relay Y1 is the testing result of initial normal condition；If sample amplitude when reproduced is more than or equal to n* reference voltages VREFAnd it is small
In equal to m* reference voltages VREF, then export the first relay of characterization and be not in initial normal condition and (be in the second contact and the
One contacting state) testing result；If sample amplitude when reproduced is less than n* reference voltages VREF, then the first relay of characterization is exported
It is short circuit that device, which is not in initial normal condition (being in the second contact and the first contacting state) and is detected mutual inductor CT1,
The testing result of state；
Second detection module compares microcontroller list when the first relay Y1, which is attracted, connects the second contact with the first contact
The sample amplitude when reproduced that member is detected and reference voltage VREFIf sample amplitude when reproduced is more than m* reference voltages VREF, then characterization is exported
Second relay Y2 is the testing result of initial normal condition；If sample amplitude when reproduced is more than or equal to n* reference voltages VREFAnd it is small
In equal to m* reference voltages VREF, then export the second relay Y2 of characterization and be not in as initial normal condition (i.e. in the 5th contact
With third contacting state) testing result；If sample amplitude when reproduced is less than n* reference voltages VREF, then characterization second is exported
Relay Y2 is not in as initial normal condition (being in the 5th contact and third contacting state) and is detected mutual inductor
CT1 is the testing result of short-circuit condition；
Third detection module connects the second contact and the first contact when the first relay Y1 is attracted, and when the second relay
When Y2 is attracted the 5th contact of connection with third contact, compare the sample amplitude when reproduced and reference voltage V that micro-control unit is detectedREF,
If sample amplitude when reproduced is more than m* reference voltages VREF, then export characterization and be detected the detection knot that mutual inductor CT1 is off state
Fruit；If sample amplitude when reproduced is more than or equal to n* reference voltages VREFAnd it is less than or equal to m* reference voltages VREF, then it is tested to export characterization
Survey the testing result that mutual inductor CT1 is normal condition；If sample amplitude when reproduced is less than n* reference voltages VREF, then characterization quilt is exported
Detect the testing result that mutual inductor CT1 is short-circuit condition；
Wherein, the value range that the value range of m is 1.1~1.5, n is 0.5~0.9.
Further, the testing result includes：Whether the first relay Y1 is initial normal condition, the second relay Y2
Whether it is initial normal condition, sensed current mutual inductor CT1 states.
Further, the sensed current mutual inductor CT1 states include normal, short circuit or off state.
Mutual inductor testing apparatus provided by the utility model, has the beneficial effect that：Described self-checking circuit itself has self-test
Function can be to avoid when relay exception by detecting whether self-checking circuit repeat circuit is in initial normal condition first
And lead to the error detection to mutual inductor state, the accuracy of mutual inductor state-detection is promoted, therefore use the utility model skill
Detection device described in art scheme can quickly and accurately detect current transformer state in distribution system, assembling and overhauling
When maintenance maintenance personnel can be facilitated to be detected, avoid mistake, improve working efficiency, improve the safety of distribution system
Property, reliability.
Description of the drawings
Fig. 1 is the schematic diagram of the utility model mutual inductor testing apparatus；
Fig. 2 is the schematic diagram of voltage detecting circuit in the utility model mutual inductor testing apparatus；
Fig. 3 is the schematic diagram of self-checking circuit in the utility model mutual inductor testing apparatus.
Reference sign：
1, it is detected mutual inductor CT1；101, the first terminals；102, the second terminals；2, voltage detecting circuit；201, electric
Press measurement module；202, first input end；203, the second input terminal；204, the first output end；205, second output terminal；3, self-test
Circuit；301, the first contact；302, the second contact；303, third contact；304, the 4th contact；305, the 5th contact；4, micro-control
Unit processed.
Specific implementation mode
The mutual inductor testing apparatus of the utility model embodiment is described in detail below in conjunction with the accompanying drawings.
Fig. 1 is the schematic diagram of the mutual inductor testing apparatus of the utility model embodiment, and Fig. 2 examines for the utility model mutual inductor
The schematic diagram of voltage detecting circuit in device is surveyed, Fig. 3 is the schematic diagram of self-checking circuit in the utility model mutual inductor testing apparatus,
Referring to Fig.1-3, the mutual inductor testing apparatus, including voltage detecting circuit 2, self-checking circuit 3 and micro-control unit 4；The electricity
Pressure detection circuit 2 is electrically connected with detected mutual inductor CT1, self-checking circuit 3 and micro-control unit 4 respectively；The self-checking circuit 3 divides
It is not electrically connected with detected mutual inductor CT1, voltage detecting circuit 2 and micro-control unit 4.
Further, the voltage detecting circuit 2, including Current Transmit 2, resistance R1, resistance R2 and voltage measurement
Module 201, the resistance R1 and R2 are electrically connected with voltage measurement module 201 respectively, the voltage measurement module 201 and microcontroller
Unit 4 is electrically connected.First terminals 101 of the first input end 202 of the Current Transmit 2 and detected mutual inductor CT1
Electrical connection, the second input terminal 203 of the Current Transmit 2 are electrically connected with self-checking circuit 3.The Current Transmit 2
First output end 204 is electrically connected with resistance R1, and the second output terminal 205 of the Current Transmit 2 is electrically connected with resistance R2；It can
Selection of land, the voltage measurement module 201 can be microcontroller, and the microcontroller can be TMS370 or XC82X series monolithics,
Voltage signal is obtained by acquiring the resistance value of current signal and resistance R1 and R2 measured by Current Transmit 2.
Further, the self-checking circuit 3, including the first relay Y1, the second relay Y2, sampled point ADT, resistance R3
It is electrically connected respectively with micro-control unit 4 with power supply AVCC, the first relay Y1, the second relay Y2 and sampled point ADT, institute
The one end for stating resistance R3 is electrically connected with power supply AVCC, and the other end of resistance R3 is electrically connected with sampled point ADT, and the power supply AVCC is used
In the reference voltage V for providing sampled point ADTREF.The first relay Y1 includes the first contact 301 and the second contact 302, just
Beginning normal condition is 302 access failure of the first contact 301 and the second contact；The second relay Y2 includes third contact 303,
Four contacts 304 and the 5th contact 305, initial normal condition are that the 5th contact 305 is connected with the 4th contact 304.Described first touches
301 ground connection of point, second contact, 302 and the 4th contact 304 are electrically connected with the second terminals 102 of detected mutual inductor CT1,
The third contact 303 is electrically connected with sampled point ADT, the second input terminal of the 5th contact 305 and Current Transmit 2
203 electrical connections.
Further, the micro-control unit 4 is used to detect the sample amplitude when reproduced of sampled point ADT, and according to sampled point electricity
Pressure and reference voltage VREF, the testing result of output characterization mutual inductor testing apparatus state.
Optionally, the micro-control unit can be STM32F207ZGT6 micro-control units, or tms320c32
Or STC51 series micro-control units, it is not limited thereto.Specifically, the micro-control unit includes：
First detection module, it is more micro- when the second relay Y2, which is attracted, connects the 5th contact 305 with third contact 303
The sample amplitude when reproduced that control unit 4 is detected and reference voltage VREFIf sample amplitude when reproduced is more than m* reference voltages VREF, then defeated
Go out the testing result that the first relay Y1 of characterization is initial normal condition；If sample amplitude when reproduced is more than or equal to n* reference voltages
VREFAnd it is less than or equal to m* reference voltages VREF, then export the first relay of characterization and be not in initial normal condition (i.e. in second
301 on-state of contact 302 and the first contact) testing result；If sample amplitude when reproduced is less than n* reference voltages VREF, then defeated
Go out the first relay of characterization be not in initial normal condition (be in 301 on-state of the second contact 302 and the first contact) and
It is detected the testing result that mutual inductor CT1 is short-circuit condition；
Second detection module, it is more micro- when the first relay Y1, which is attracted, connects the second contact 302 and the first contact 301
The sample amplitude when reproduced that control unit 4 is detected and reference voltage VREFIf sample amplitude when reproduced is more than m* reference voltages VREF, then defeated
Go out the testing result that the second relay Y2 of characterization is initial normal condition；If sample amplitude when reproduced is more than or equal to n* reference voltages
VREFAnd it is less than or equal to m* reference voltages VREF, then export the second relay Y2 of characterization and be not in and (be in for initial normal condition
5th contact 305 and 303 on-state of third contact) testing result；If sample amplitude when reproduced is less than n* reference voltages VREF,
The second relay Y2 of characterization is then exported to be not in as initial normal condition (i.e. in the 5th contact 305 and the connection of third contact 303
State) and it is detected the testing result that mutual inductor CT1 is short-circuit condition；
Third detection module connects the second contact 302 and the first contact 301 when the first relay Y1 is attracted, and when second
When relay Y2 is attracted the 5th contact 305 of connection with third contact 303, compare the sample amplitude when reproduced that micro-control unit 4 is detected
With reference voltage VREFIf sample amplitude when reproduced is more than m* reference voltages VREF, then it is open circuit to export characterization and be detected mutual inductor CT1
The testing result of state；If sample amplitude when reproduced is more than or equal to n* reference voltages VREFAnd it is less than or equal to m* reference voltages VREF, then
Output characterization is detected the testing result that mutual inductor CT1 is normal condition；If sample amplitude when reproduced is less than n* reference voltages VREF,
It then exports characterization and is detected the testing result that mutual inductor CT1 is short-circuit condition；
Wherein, the value range that the value range of m is 1.1~1.5, n is 0.5~0.9.
Further, the testing result includes：Whether the first relay Y1 is initial normal condition, the second relay Y2
Whether it is initial normal condition, sensed current mutual inductor CT1 states.
Further, the sensed current mutual inductor CT1 states include normal, short circuit and off state.
Mutual inductor testing apparatus provided by the utility model, described self-checking circuit itself have self-checking function, pass through head
First whether detection self-checking circuit repeat circuit is in initial normal condition, can cause to mutual inductance to avoid when relay exception
The error detection of device state promotes the accuracy of mutual inductor state-detection, therefore using described in technical solutions of the utility model
Mutual inductor testing apparatus can quickly and accurately detect current transformer state in distribution system, can in assembly and maintenance
To facilitate maintenance maintenance personnel to be detected, avoid mistake, improve working efficiency, improve distribution system safety, can
By property.
Above description is only a specific implementation of the present invention, but the scope of protection of the utility model is not limited to
In this, any one skilled in the art within the technical scope disclosed by the utility model, can readily occur in variation
Or replace, it should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model should be with the power
Subject to the protection domain that profit requires.
Claims (10)
1. a kind of mutual inductor testing apparatus, including it is detected mutual inductor CT1, which is characterized in that the mutual inductor testing apparatus is also
Including voltage detecting circuit (2), self-checking circuit (3) and micro-control unit (4)；The voltage detecting circuit (2) respectively with it is tested
Survey mutual inductor CT1, self-checking circuit (3) and micro-control unit (4) electrical connection；The self-checking circuit (3) respectively with detected mutual inductance
Device CT1, voltage detecting circuit (2) and micro-control unit (4) electrical connection.
2. mutual inductor testing apparatus according to claim 1, which is characterized in that the voltage detecting circuit (2), including electricity
Current transformer CT2, resistance R1, resistance R2 and voltage measurement module (201), the resistance R1 and R2 respectively with voltage measurement module
(201) it is electrically connected, the voltage measurement module (201) is electrically connected with micro-control unit (4).
3. mutual inductor testing apparatus according to claim 2, which is characterized in that the first of the Current Transmit 2 is defeated
Enter end (202) to be electrically connected with the first terminals (101) of detected mutual inductor CT1, the second input of the Current Transmit 2
End (203) is electrically connected with self-checking circuit (3).
4. mutual inductor testing apparatus according to claim 2, which is characterized in that the first of the Current Transmit 2 is defeated
Outlet (204) is electrically connected with resistance R1, and the second output terminal (205) of the Current Transmit 2 is electrically connected with resistance R2.
5. mutual inductor testing apparatus according to claim 1, which is characterized in that the self-checking circuit (3), including first after
Electric appliance Y1, the second relay Y2, sampled point ADT, resistance R3 and power supply AVCC, the first relay Y1, the second relay Y2
It is electrically connected respectively with micro-control unit (4) with sampled point ADT, one end of the resistance R3 is electrically connected with power supply AVCC, resistance R3
The other end be electrically connected with sampled point ADT, the power supply AVCC is used to provide the reference voltage V of sampled point ADTREF。
6. mutual inductor testing apparatus according to claim 5, which is characterized in that the first relay Y1 includes first tactile
Point (301) and the second contact (302), initial normal condition are the first contact (301) and the second contact (302) access failure；It is described
Second relay Y2 includes third contact (303), the 4th contact (304) and the 5th contact (305), and initial normal condition is the 5th
Contact (305) is connected with the 4th contact (304).
7. mutual inductor testing apparatus according to claim 6, which is characterized in that the first contact (301) ground connection is described
Second contact (302) and the 4th contact (304) are electrically connected with the second terminals (102) of detected mutual inductor CT1, the third
Contact (303) is electrically connected with sampled point ADT, the second input terminal (203) of the 5th contact (305) and Current Transmit 2
Electrical connection.
8. mutual inductor testing apparatus according to claim 1, which is characterized in that the micro-control unit (4) is for detecting
The sample amplitude when reproduced of sampled point ADT, and according to sample amplitude when reproduced and reference voltage VREF, output characterization mutual inductor testing apparatus shape
The testing result of state.
9. mutual inductor testing apparatus according to claim 8, which is characterized in that the testing result includes：First relay
Whether device Y1 is initial normal condition, whether the second relay Y2 is initial normal condition, sensed current mutual inductor CT1 shapes
State.
10. mutual inductor testing apparatus according to claim 9, which is characterized in that the sensed current mutual inductor CT1 shapes
State includes normal, short circuit or off state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721501306.0U CN207623505U (en) | 2017-11-06 | 2017-11-06 | Mutual inductor detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721501306.0U CN207623505U (en) | 2017-11-06 | 2017-11-06 | Mutual inductor detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207623505U true CN207623505U (en) | 2018-07-17 |
Family
ID=62828529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721501306.0U Active CN207623505U (en) | 2017-11-06 | 2017-11-06 | Mutual inductor detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207623505U (en) |
-
2017
- 2017-11-06 CN CN201721501306.0U patent/CN207623505U/en active Active
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