CN214252432U - Detection circuit for de-excitation resistor - Google Patents
Detection circuit for de-excitation resistor Download PDFInfo
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- CN214252432U CN214252432U CN202023218757.8U CN202023218757U CN214252432U CN 214252432 U CN214252432 U CN 214252432U CN 202023218757 U CN202023218757 U CN 202023218757U CN 214252432 U CN214252432 U CN 214252432U
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- resistor
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- current signal
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- detection circuit
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- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 28
- 230000001629 suppression Effects 0.000 claims description 17
- 230000005347 demagnetization Effects 0.000 claims description 7
- 238000010791 quenching Methods 0.000 claims 1
- 230000000171 quenching effect Effects 0.000 claims 1
- 230000005284 excitation Effects 0.000 abstract description 15
- 238000004804 winding Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Abstract
The utility model relates to an electric power system excitation control technical field discloses an acquire accurate and timely detection circuitry that is used for deexcitation resistance of electric current for acquire the current signal of deexcitation resistance, possess: the main controller is configured in the detection circuit and used for receiving the current signal acquired by the sampling resistor and controlling the frequency of the current signal; a signal generator, the signal input end of which is coupled with the output end of the main controller, and is used for receiving the current signal after frequency control and controlling the phase of the current signal; and the signal input end of the signal amplifier is connected with the output end of the signal generator and is used for receiving the current signal after phase control and amplifying the current signal.
Description
Technical Field
The utility model relates to an electric power system excitation control technical field, more specifically say, relate to a detection circuitry for deexcitation resistance.
Background
When the generator set normally operates, a rectifier of an excitation system provides an excitation power supply for a generator rotor through a field suppression switch, when the generator set normally stops or is shut down by accident, the field suppression switch cuts off the excitation power supply, meanwhile, a normally closed auxiliary contact of the field suppression switch is used for switching in a field suppression resistor, a generator rotor winding continues current through the field suppression resistor, the rotor winding is released to store energy, and the generator set is rapidly shut down by voltage reduction. At present, when the overvoltage of a rotor winding is caused by sudden disconnection of rotor current and sudden change of a magnetic field, the current excitation system cannot timely acquire and feed back the current parameter of a field suppression resistor, and when an excited synchronous generator fails and excitation current becomes negative in a transition process, the rectifier cannot enable the excitation current to reversely flow, so that the winding generates the overvoltage which can reach more than 10 times of rated voltage, and the overvoltage between rotor windings causes the coil to be broken down.
Therefore, how to accurately and timely obtain the current parameters of the field suppression resistor becomes a technical problem that needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned overvoltage when rotor winding of prior art because rotor current breaks off suddenly, the magnetic field takes place the sudden change and arouses, and current excitation system can not in time feed back the current parameter of deexcitation resistance, and causes the overvoltage between the rotor winding and lead to the defect that the coil was punctured, provides one kind and acquires the accurate and timely detection circuitry that is used for deexcitation resistance of electric current.
The utility model provides a technical scheme that its technical problem adopted is: a detection circuit for a field suppression resistor is configured to acquire a current signal of the field suppression resistor, and the detection circuit includes:
the main controller is configured in the detection circuit and used for receiving the current signal acquired by the sampling resistor and controlling the frequency of the current signal;
a signal generator, a signal input end of which is coupled to the output end of the main controller, and is used for receiving the current signal after frequency control and controlling the phase of the current signal;
and the signal input end of the signal amplifier is connected with the output end of the signal generator and is used for receiving the current signal after phase control and amplifying the current signal.
In some embodiments, the sampling resistor is a first resistor, one end of the first resistor is connected to one end of the demagnetization resistor, and the other end of the first resistor is connected to the signal input end of the master controller.
In some embodiments, the device further comprises a first capacitor, one end of the first capacitor is connected with one end of the first resistor, and the other end of the first capacitor is connected with a common end.
In some embodiments, the device further comprises a fifth resistor and a third capacitor,
one end of the fifth resistor is connected with the output end of the signal generator, and the other end of the fifth resistor is connected with one end of the third capacitor.
In some embodiments, the device further includes a fifth capacitor, one end of the fifth capacitor is connected to the other end of the third capacitor, and the other end of the fifth capacitor is coupled to the non-inverting terminal of the signal amplifier.
The detection circuit for the field suppression resistor of the utility model comprises a main controller, a signal generator and a signal amplifier, wherein the main controller is used for receiving the current signal acquired by the sampling resistor and controlling the frequency of the current signal; the signal generator is used for receiving the current signal after frequency control and controlling the phase of the current signal; the signal amplifier is used for receiving the current signal after the phase control and amplifying the current signal. Compared with the prior art, the frequency control and the phase control are respectively carried out on the input current signal through the matching of the main controller and the signal generator, so that the accuracy of the current signal is improved, the problem that when an excitation system fails to timely acquire and feed back current parameters of the field suppression resistor, and when an excited synchronous generator fails and excitation current becomes negative in the transition process, the rectifier cannot enable the excitation current to reversely flow, so that the winding generates overvoltage which can reach more than 10 times of rated voltage, and the overvoltage between rotor windings causes the breakdown of the coil.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a main control circuit diagram of an embodiment of a detection circuit for a field suppression resistor provided by the present invention;
fig. 2 is a circuit diagram of a signal generating unit according to an embodiment of the detection circuit for a field suppression resistor provided by the present invention;
fig. 3 is an amplifying circuit diagram of an embodiment of the detection circuit for the field suppression resistor provided by the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1-3, in the first embodiment of the detection circuit for a demagnetization resistor of the present invention, the detection circuit for a demagnetization resistor includes a main control circuit 100, a signal generation unit 200, and an amplification circuit 300.
The main control circuit 100 includes a main controller U101 and a sampling resistor (corresponding to the first resistor R101). Specifically, the main controller U101 is configured in the detection circuit, and is configured to receive the current signal obtained by the sampling resistor, control the frequency of the current signal, and output the current signal to the signal generation unit 200.
The signal generation unit 200 includes a signal generator U201.
Specifically, the signal input end (corresponding to pins 1-4) of the signal generator U201 is connected to the output end (corresponding to pins 21-24) of the main controller U101, and is configured to receive the current signal after frequency control, control the phase of the current signal, and output the current signal to the amplifying circuit 300.
The amplifying circuit 300 includes a signal amplifier a301 having a function of signal amplification.
Specifically, a signal input end (corresponding to 4 pins) of the signal amplifier a301 is connected to an output end (corresponding to 21 pins) of the signal generator U201, and is configured to receive the phase-controlled current signal and amplify the current signal.
By using the technical scheme, the main controller U101 is matched with the signal generator U201 to respectively carry out frequency control and phase control on the input current signal so as to improve the accuracy of the current signal, and effectively solve the problem that when an excitation system fails to timely acquire and feed back current parameters of a field suppression resistor, and an excited synchronous generator fails and excitation current is negatively changed in the transition process, the rectifier cannot enable the excitation current to reversely flow, so that the winding generates overvoltage which can reach more than 10 times of rated voltage, and the overvoltage between rotor windings causes the problem that the coil is broken down.
In some embodiments, in order to improve the accuracy of the current signal, a sampling resistor may be disposed in the main control circuit 100, wherein the sampling resistor is the first resistor R101.
Specifically, one end of the first resistor R101 is connected to one end of the demagnetization resistor, and the other end of the first resistor R101 is connected to the signal input end of the main controller U101.
In some embodiments, in order to improve the stability of the main control circuit 100, a first capacitor C101 may be further included at the periphery of the main controller U101, and specifically, one end of the first capacitor C101 is connected to one end of the first resistor R101, and the other end of the first capacitor C101 is connected to the common terminal.
In some embodiments, the device further includes a fifth resistor R204 and a third capacitor C202,
one end of the fifth resistor R204 is connected to the output end of the signal generator U201, and the other end of the fifth resistor R204 is connected to one end of the third capacitor C202.
In some embodiments, the circuit further includes a fifth capacitor C301, one end of the fifth capacitor C301 is connected to the other end of the third capacitor C202, and the other end of the fifth capacitor C301 is coupled to the non-inverting terminal of the signal amplifier a 301.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (5)
1. A detection circuit for a field suppression resistor for acquiring a current signal of the field suppression resistor, the detection circuit comprising:
the main controller is configured in the detection circuit and used for receiving the current signal acquired by the sampling resistor and controlling the frequency of the current signal;
a signal generator, a signal input end of which is coupled to the output end of the main controller, and is used for receiving the current signal after frequency control and controlling the phase of the current signal;
and the signal input end of the signal amplifier is connected with the output end of the signal generator and is used for receiving the current signal after phase control and amplifying the current signal.
2. The detection circuit for a demagnetization resistor according to claim 1,
the sampling resistor is a first resistor, one end of the first resistor is connected with one end of the de-excitation resistor, and the other end of the first resistor is connected with the signal input end of the main controller.
3. The detection circuit for a quenching resistor according to claim 2,
the capacitor further comprises a first capacitor, one end of the first capacitor is connected with one end of the first resistor, and the other end of the first capacitor is connected with the public end.
4. The detection circuit for a demagnetization resistor according to claim 1,
also comprises a fifth resistor and a third capacitor,
one end of the fifth resistor is connected with the output end of the signal generator, and the other end of the fifth resistor is connected with one end of the third capacitor.
5. The detection circuit for a demagnetization resistor according to claim 4,
the signal amplifier further comprises a fifth capacitor, one end of the fifth capacitor is connected with the other end of the third capacitor, and the other end of the fifth capacitor is coupled to the non-inverting end of the signal amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023218757.8U CN214252432U (en) | 2020-12-28 | 2020-12-28 | Detection circuit for de-excitation resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023218757.8U CN214252432U (en) | 2020-12-28 | 2020-12-28 | Detection circuit for de-excitation resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214252432U true CN214252432U (en) | 2021-09-21 |
Family
ID=77743557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023218757.8U Active CN214252432U (en) | 2020-12-28 | 2020-12-28 | Detection circuit for de-excitation resistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214252432U (en) |
-
2020
- 2020-12-28 CN CN202023218757.8U patent/CN214252432U/en active Active
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Address after: 518000 511-514, No. 6352, Pingshan Avenue, Shatian community, Kengzi street, Pingshan District, Shenzhen, Guangdong Patentee after: Shenzhen Ke Lei Ke Technology Co.,Ltd. Country or region after: China Address before: 518000 511-514, No. 6352, Pingshan Avenue, Shatian community, Kengzi street, Pingshan District, Shenzhen, Guangdong Patentee before: SHENZHEN CLAKE TECHNOLOGY Co.,Ltd. Country or region before: China |