CN204882789U - CT polarity test device - Google Patents
CT polarity test device Download PDFInfo
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- CN204882789U CN204882789U CN201520643325.1U CN201520643325U CN204882789U CN 204882789 U CN204882789 U CN 204882789U CN 201520643325 U CN201520643325 U CN 201520643325U CN 204882789 U CN204882789 U CN 204882789U
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- 238000012360 testing method Methods 0.000 title claims abstract description 34
- 230000035945 sensitivity Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 238000004804 winding Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 208000032368 Device malfunction Diseases 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The utility model provides a CT polarity test device which includes: resistance (R1), resistance (R2), resistance (RS), diode (D), relay (CJ), switch (AN1), switch (AN2), switch (AN3), single -pole double -throw (K2), switch (K1), DC power supply (EC1), DC power supply (EC2), emitting diode (LED1), emitting diode (LED2). The utility model discloses satisfying relay protection job site's actual need completely, having characteristics such as test sensitivity, convenient operation, portable, reliable practicality, can improve site work efficiency greatly, and it is directly perceived, concrete to test light indication, electronic components power consumption is few, and is with low costs, and the power consumption is low, can be used to long -time test.
Description
Technical field
The utility model relates to electric power apparatus examination, electric instrument technical field of measurement and test, particularly a kind of CT polarity test device.
Background technology
According to electromagnetic induction principle, primary side big current is converted to secondary side small area analysis to use, and it is made up of the iron core closed and winding current transformer (Currenttransformer is called for short CT) usually.Its first side winding string is in the circuit needing the electric current measured, and secondary side winding is serially connected in measurement instrument and protective loop.Operationally, secondary side circuit is closed to current transformer all the time, and the duty of current transformer is close to short circuit, and secondary side can not be opened a way.
In the production work of electric system secondary, the work such as current transformer replacing, major repair project often related to, needs measuring current mutual inductor polarity.Current transformer incorrect polarity may cause the consequences such as protective relaying device malfunction, tripping, causes tremendous influence to the reliability service of electrical network.
At present, current transformer polarity testing is divided into two kinds of methods:
A kind of is the polarity making Current Transformer test instrument measuring current mutual inductor, this kind of method of testing test duration is long, and the testing crew needed is also many, and especially some old transformer station experiment power supplies are less, power supply connects and draws difficulty, virtually adds the time in whole test.
Another kind is the method for common dry cell test polarity.Be specially, use common dry cell and reometer serial connection to form, this kind of method of testing flows through an electric current to mutual inductor primary side, and secondary side induces a small area analysis, by judging that sense of current judges the polarity of current transformer.If current transformer ratio is comparatively large, then the electric current that induces of secondary will very little, and this is very high to the accuracy requirement of secondary side current table, and cost is just very high, and the method can not make good reaction by the current transformer larger to no-load voltage ratio.
Utility model content
The purpose of this utility model is to provide a kind of CT polarity test device, with realize sensitive, the dynamic range of test large, be easy to carry, current transformer polarity testing simple to operate.
To achieve these goals, the technical solution of the utility model is as follows:
A kind of CT polarity test device, it comprises: resistance (R1), the first end of resistance (R1) is connected to the first end of a switch (AN2), second end of resistance (R1) is connected to the anode of a diode (D), and the second end of switch (AN2) is connected to the first not first end of moved end, a switch (K1), first end of a resistance (R2) of a single-pole double-throw switch (SPDT) (K2) simultaneously; The negative electrode of diode (D) is connected to the first input end of a relay (CJ), the first end of a resistance (RS), second input end of relay (CJ) is connected to the moved end of single-pole double-throw switch (SPDT) (K2), and the second end of resistance (RS) is connected to the first end of switch (AN3); Wherein, relay (CJ) at least has two groups of output nodes (CJ-1, CJ-2), and in two groups of output nodes (CJ-1, CJ-2), one for often to open node, and another is normally closed node; The negative pole of one direct supply (EC2) is connected to the second not negative electrode of moved end, a light emitting diode (LED1), negative electrode of a light emitting diode (LED2) of the second end of switch (AN3), single-pole double-throw switch (SPDT) (K2), and the positive pole of direct supply (EC2) is connected to the second end of switch (K1); The output node (CJ-1) of relay (CJ) is connected between the anode of the second end of resistance (R2), light emitting diode (LED1), and the output node (CJ-2) of relay (CJ) is connected between the anode of the second end of resistance (R2), light emitting diode (LED2).
Preferably, in above-mentioned CT polarity test device, also comprise: a direct supply (EC1), and the switch (AN1) be connected with direct supply (EC1).
Preferably, in above-mentioned CT polarity test device, switch (AN1), switch (AN2), switch (AN3) are pushbutton switch.
Analyze known; the utility model meets the actual needs of relay protection working site completely; have test sensitive, easy to operate, be easy to carry, the feature such as reliable and practical; can greatly improve work on the spot efficiency; and test lamplight pointing is directly perceived, concrete, electronic devices and components power consumption is few, and cost is low; consume energy low, can be used for long test.
Accompanying drawing explanation
Fig. 1 is the basic circuit diagram of the utility model embodiment;
Fig. 2 is the elementary diagram of the relay CJ of the utility model embodiment.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further details.
Fig. 1 shows the circuit structure of the utility model embodiment, and the wire connection structure between itself and Current Transmit.
As shown in Figure 1, the utility model embodiment comprises resistance R1, resistance R2, resistance RS, diode D, relay CJ, switch AN1, switch AN2, switch AN3, single-pole double-throw switch (SPDT) K2, K switch 1, direct supply EC1, direct supply EC2, LED 1, LED 2.
Specifically, the first end of resistance R1 is connected to the first end of switch AN2, second end of resistance R1 is connected to the anode of diode D, and second end of switch AN2 is connected to the first not first end of moved end K21, K switch 1, the first end of resistance R2 of single-pole double-throw switch (SPDT) K2 simultaneously.
The negative electrode of diode D is connected to the first input end of relay CJ, the first end of resistance RS, and second input end of relay CJ is connected to the moved end of single-pole double-throw switch (SPDT) K2, and second end of resistance RS is connected to the first end of switch AN3.As shown in Figure 2, relay CJ at least has two groups of output nodes CJ-1, CJ-2, and in two groups of output nodes CJ-1, CJ-2, one for often to open node (node CJ-2), and another is normally closed node (node CJ-1).The positive pole of relay CJ input end is connected between diode D and resistance RS, and relay CJ input cathode is connected with the moved end of K switch 2.When relay CJ electric current is flowed into by positive pole, node CJ-2 is closed, node CJ-1 disconnects.When relay CJ electric current is flowed into by negative pole, node CJ-1 is closed, node CJ-2 disconnects.The output node CJ-1 of relay CJ is connected between the anode of second end of resistance R2, LED 1, and the output node CJ-2 of relay CJ is connected between the anode of second end of resistance R2, LED 2.
The negative pole of direct supply EC2 is connected to the second not negative electrode of moved end K22, LED 1, the negative electrode of LED 2 of second end of switch AN3, single-pole double-throw switch (SPDT) K2, and the positive pole of direct supply EC2 is connected to the second end of K switch 1.
The switch AN1 that direct supply EC1 is connected with direct supply EC1, for take structure outward, can not be integrated in foregoing circuit structure.
Preferably, switch AN1, switch AN2, switch AN3 are pushbutton switch.
During the utility model embodiment embody rule, be substantially divided into three processes, be respectively:
One, the course of work
Before work, K switch 1 closed, LED 1 lamp for power supply instruction is bright, now illustrates that the present embodiment can use.K switch 2 is switched to " work " position, namely the first not moved end K21, now can test.
Its positive pole, for take power supply outward, is connected with the primary side terminals P 1 of Current Transmit by direct supply EC1, and negative pole is connected with primary side terminals P 2 side of Current Transmit.Press the testing button of switch AN1, now Current Transmit primary side has electric current to flow through, secondary side induces electric current and is flowed out by terminal S1, and flows through diode D, relay CJ, single-pole double-throw switch (SPDT) K2 successively, then flows back to the secondary side terminal S2 of Current Transmit.Now, the action of relay CJ positive flow excess current, node CJ-2 is closed, node CJ-1 disconnects.Now, the electric current of direct supply EC2 flowing through K switch 1, resistance R2, node CJ-2 according to this, for characterizing the LED 2 of same polarity, forming loop, and now LED 2 is luminous, represents Current Transmit test for same polarity.
Two, involution process
Because the present embodiment uses relay CJ to be magnetism holding type relay, when after relay CJ action, node CJ-2 can be kept closed, and is therefore provided with involution loop.
Disconnecting external loop, K switch 1 closes, and K switch 2 dozens is to the first not moved end K21.Now press the involution button of switch AN3, electric current flows through K switch 1, K switch 2, relay CJ, resistance RS, switch AN3 successively by direct supply EC2 positive pole, then flows back to direct supply EC2 negative pole.Now relay CJ flows counterflow through electric current, and node CJ-1 is closed, node CJ-2 disconnects, and now LED 1 is luminous, returns to the front state of test.
Three, self-check of device process
Consider that relay CJ has corresponding serviceable life, therefore, the present embodiment devises self-inspection loop to detect the situation of relay CJ.
Before self-inspection, K switch 1 is closed, K switch 2 is switched to test position, be i.e. the second not moved end K22.Now press the debugging button of switch AN2, form loop.Electric current is flowed out by direct supply EC2 positive pole, flows through K switch 1, switch AN2, resistance R1, diode D, relay CJ, K switch 2 successively, then flows back to direct supply EC2 negative pole.Now, the input end positive flow excess current of relay CJ, relay CJ action, node CJ-2 is closed, node CJ-1 disconnects, the electric current of direct supply EC2 flows through K switch 1, resistance R2, node CJ-2, LED 2 successively, form loop, if LED 2 is luminous, prove that relay CJ can continue normal use.
To sum up, the utility model can realize volume little, be easy to carry, be easy to the effects such as use, change traditional test mode, substantially increase work on the spot efficiency, and test lamplight pointing is directly perceived, concrete, electronic devices and components power consumption is few, can be used for long test.
As known by the technical knowledge, the utility model can be realized by other the embodiment not departing from its Spirit Essence or essential feature.Therefore, above-mentioned disclosed embodiment, with regard to each side, all just illustrates, is not only.Allly all to be included in the utility model within the scope of the utility model or being equal to the change in scope of the present utility model.
Claims (3)
1. a CT polarity test device, is characterized in that, comprising:
Resistance (R1), the first end of resistance (R1) is connected to the first end of a switch (AN2), second end of resistance (R1) is connected to the anode of a diode (D), and the second end of switch (AN2) is connected to the first not first end of moved end, a switch (K1), first end of a resistance (R2) of a single-pole double-throw switch (SPDT) (K2) simultaneously;
The negative electrode of diode (D) is connected to the first input end of a relay (CJ), the first end of a resistance (RS), second input end of relay (CJ) is connected to the moved end of single-pole double-throw switch (SPDT) (K2), and the second end of resistance (RS) is connected to the first end of switch (AN3); Wherein, relay (CJ) at least has two groups of output nodes (CJ-1, CJ-2), and in two groups of output nodes (CJ-1, CJ-2), one for often to open node, and another is normally closed node;
The negative pole of one direct supply (EC2) is connected to the second not negative electrode of moved end, a light emitting diode (LED1), negative electrode of a light emitting diode (LED2) of the second end of switch (AN3), single-pole double-throw switch (SPDT) (K2), and the positive pole of direct supply (EC2) is connected to the second end of switch (K1);
The output node (CJ-1) of relay (CJ) is connected between the anode of the second end of resistance (R2), light emitting diode (LED1), and the output node (CJ-2) of relay (CJ) is connected between the anode of the second end of resistance (R2), light emitting diode (LED2).
2. CT polarity test device according to claim 1, is characterized in that, also comprise:
One direct supply (EC1), and the switch (AN1) be connected with direct supply (EC1).
3. CT polarity test device according to claim 2, is characterized in that, switch (AN1), switch (AN2), switch (AN3) are pushbutton switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520643325.1U CN204882789U (en) | 2015-08-24 | 2015-08-24 | CT polarity test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520643325.1U CN204882789U (en) | 2015-08-24 | 2015-08-24 | CT polarity test device |
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| Publication Number | Publication Date |
|---|---|
| CN204882789U true CN204882789U (en) | 2015-12-16 |
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| CN201520643325.1U Expired - Fee Related CN204882789U (en) | 2015-08-24 | 2015-08-24 | CT polarity test device |
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| CN (1) | CN204882789U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137276A (en) * | 2015-08-24 | 2015-12-09 | 国家电网公司 | CT polarity testing device |
| CN106066449A (en) * | 2016-05-25 | 2016-11-02 | 国网辽宁省电力有限公司检修分公司 | Intelligent electric current mutual inductor polarity tester |
-
2015
- 2015-08-24 CN CN201520643325.1U patent/CN204882789U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137276A (en) * | 2015-08-24 | 2015-12-09 | 国家电网公司 | CT polarity testing device |
| CN105137276B (en) * | 2015-08-24 | 2017-12-12 | 国家电网公司 | CT polarity test devices |
| CN106066449A (en) * | 2016-05-25 | 2016-11-02 | 国网辽宁省电力有限公司检修分公司 | Intelligent electric current mutual inductor polarity tester |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151216 Termination date: 20180824 |
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| CF01 | Termination of patent right due to non-payment of annual fee |