CN201464549U - Loss-of-excitation protection auxiliary distinguishing element based on measured value of generator stator circuit - Google Patents
Loss-of-excitation protection auxiliary distinguishing element based on measured value of generator stator circuit Download PDFInfo
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- CN201464549U CN201464549U CN2009200382138U CN200920038213U CN201464549U CN 201464549 U CN201464549 U CN 201464549U CN 2009200382138 U CN2009200382138 U CN 2009200382138U CN 200920038213 U CN200920038213 U CN 200920038213U CN 201464549 U CN201464549 U CN 201464549U
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- loss
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- microprocessor
- stator side
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Abstract
A loss-of-excitation protection auxiliary distinguishing element based on the measured values of a generator stator circuit comprises a stator side current transformer, a stator side voltage transformer, an AD sampling circuit, a microprocessor, an accelerating relay, a lockout relay, wherein the signal output terminals of the stator side current transformer and the stator side voltage transformer are respectively connected with the current and the voltage analog signal input terminals of the AD sampling circuit, the AD sampling circuit is connected with the microprocessor through a high-speed data bus, an accelerating loss-of-excitation protection signal output terminal of the microprocessor is connected with a signal input terminal of the accelerating relay, and a lockout loss-of-excitation protection signal output terminal of the microprocessor is connected with a lockout relay signal input terminal. The loss-of-excitation protection auxiliary distinguishing element can distinguish the loss-of-excitation failure instantaneously in case of loss-of-excitation protection of a motor by avoiding the defect of the loss-of-excitation auxiliary distinguishing element which takes the rotor voltage as the criterion, and identifies the loss-of-excitation protection action in combination with the motor, thereby enhancing the reliability and the sensibility of the loss-of-excitation protection action of the motor protection device.
Description
Technical field
The utility model relates to a kind of auxiliary discriminating element of differentiating the generator loss-of-excitation protection action by motor stator loop measured value.
Background technology
The loss of exicitation failure rate is all than higher over the years in China, thereby generator loss-of-excitation protection obtains work about electric power persons' at different levels attention.In recent years, China has obtained very big achievement having done a lot of work aspect the analysis of the mistake excitation of generator and the test.Also developing multiple model aspect the field loss protection device, its performance has satisfied the requirement of electric system basically, but also comes with some shortcomings.Because all there is certain defective in the field loss protection master criterion of protection equipment for generator, thereby a lot of producer has added the discriminating element of rotor voltage as assistant criteria again.But there is following shortcoming in rotor voltage as the discriminating element of assistant criteria.
1, is not suitable for brushless excitation.Brushless excitation in the past only is used for the large-scale unit of import, and homemade in recent years Pump for Medium and Small Power Generating Set has also adopted brushless excitation.
2, do not react the rotor winding disconnection fault.For example slip ring fault or loose contact.
3, normally vibrate and lose in the asynchronous operation after the excitation, because the fluctuation of stator loop current causes very big rotor voltage fluctuation, rotor voltage crest during normal vibration may surpass the return voltage of rotor assistant criteria, and the rotor voltage trough when losing asynchronous operation after the excitation may be lower than operation voltage even oppositely.Therefore as do not take measures, then may misoperation when vibration, in the asynchronous operation of losing excitation, may return by mistake.
Summary of the invention
Technical problem to be solved in the utility model is, overcomes the shortcoming of prior art, provides a kind of field loss protection based on generator unit stator loop measured value auxiliary discriminating element, can motor stator loop measured value is auxiliary differentiates field loss protection by adopting.
The technical scheme that its technical matters that solves the utility model adopts is as follows: based on the auxiliary discriminating element of the field loss protection of generator unit stator loop measured value; it is characterized in that forming and comprise the stator side current transformer; the stator side voltage transformer (VT); the AD sampling circuit; microprocessor; accelerating relay; locking relay; described stator side current transformer; the signal output part of stator side voltage transformer (VT) respectively with the electric current of AD sampling circuit; the voltage analog signal input end connects; the digital signal output end of AD sampling circuit is connected with the digital signal input end of microprocessor by high speed data bus; the acceleration field loss protection signal output part of microprocessor is connected with the signal input part of accelerating relay, and the locking field loss protection signal output part of microprocessor is connected with the locking relay signal input part.
The beneficial effects of the utility model are as follows: it is that digital quantity sends microprocessor to by high-speed bus with electric current, the voltage transitions in motor stator loop that the utility model adopts the AD sampling, whether the electric current that microprocessor obtains by the AD sampling, voltage are differentiated is field loss protection, then by two relays send to two of protection equipment for generator open into, play the effect of quickening field loss protection and locking field loss protection respectively; The utility model has avoided utilizing the shortcoming of rotor voltage as the auxiliary discriminating element existence of the field loss protection of criterion; can determine the loss of excitation fault in the moment of motor generation field loss protection; cooperate protection equipment for generator to confirm the field loss protection action, improve the reliability and the sensitivity of protection equipment for generator field loss protection action.
Description of drawings
Fig. 1 is that the utility model is based on the auxiliary discriminating element circuit block diagram of the field loss protection of generator unit stator loop measured value.
Embodiment
With reference to the accompanying drawings and in conjunction with the embodiments the utility model is described in further detail.But the utility model is not limited to given example.
As shown in Figure 1; the utility model is based on the auxiliary discriminating element of the field loss protection of generator unit stator loop measured value; its composition comprises stator side current transformer CTa; CTb; CTc; stator side voltage transformer pt a; PTb; PTc; AD sampling circuit A/D; microprocessor CPU; accelerating relay J1; locking relay J2; stator side current transformer CTa; CTb; the signal output part C1 of CTc; C2; C3; stator side voltage transformer pt a; PTb; the signal output part P1 of PTc; P2; P3 respectively with the current-mode of AD sampling circuit with signal input part C4; C5; C6; voltage-mode is with signal input part P4; P5; P6 connects; the digital signal output end of AD sampling circuit A/D is connected with the digital signal input end of microprocessor CPU by high speed data bus L; the acceleration field loss protection signal output part D1 of microprocessor CPU is connected with the signal input part D2 of accelerating relay J1, and the locking field loss protection signal output part D3 of microprocessor CPU is connected with the signal input part D4 of locking relay J2.As shown in Figure 1, the contact of accelerating relay J1, locking relay J2 offers opening into end K1, K2 of protection equipment for generator S.In the present embodiment, high speed data bus can adopt HPI bus, VME bus.
Processor adopting 32 bit CPUs of the present utility model and 16 bit A/D converters constitute, every power frequency period 48 points of sampling.The AD sampling circuit gather the generator unit stator loop after by the PT conversion three-phase voltage and by the three-phase current after the CT conversion, convert digital signal to and pass to CPU by high-speed bus, CPU calculates instantaneous negative sequence voltage U2k, instantaneous active power Pk and the instantaneous reactive power Qk of each sampled point motor.Calculate their variation differences in the unit interval then.CPU carries out relevant logic determines to measured value with calculated value again.When being judged as the mistake excitation fault; start auxiliary accelerating relay J1; the J1 relay contact inserts opening on the terminal K1 of protection equipment for generator, when protection equipment for generator determines after this opens closure, thereby then quickens the sensitivity that the field loss protection action guarantees field loss protection.When being judged as non-mistake excitation fault; start auxiliary locking relay J2; the J2 relay contact inserts opening on the terminal K2 of protection equipment for generator, and when protection equipment for generator determines after this opens closure, thereby then locking field loss protection action guarantees the reliability of field loss protection.
Claims (2)
1. based on the auxiliary discriminating element of the field loss protection of generator unit stator loop measured value; it is characterized in that forming and comprise the stator side current transformer; the stator side voltage transformer (VT); the AD sampling circuit; microprocessor; accelerating relay; locking relay; described stator side current transformer; the signal output part of stator side voltage transformer (VT) respectively with the electric current of AD sampling circuit; the voltage analog signal input end connects; the digital signal output end of AD sampling circuit is connected with the digital signal input end of microprocessor by high speed data bus; the acceleration field loss protection signal output part of microprocessor is connected with the signal input part of accelerating relay, and the locking field loss protection signal output part of microprocessor is connected with the locking relay signal input part.
2. the auxiliary discriminating element of the field loss protection based on generator unit stator loop measured value according to claim 1 is characterized in that described high speed data bus is HPI bus or VME bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200382138U CN201464549U (en) | 2009-01-13 | 2009-01-13 | Loss-of-excitation protection auxiliary distinguishing element based on measured value of generator stator circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200382138U CN201464549U (en) | 2009-01-13 | 2009-01-13 | Loss-of-excitation protection auxiliary distinguishing element based on measured value of generator stator circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201464549U true CN201464549U (en) | 2010-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200382138U Expired - Lifetime CN201464549U (en) | 2009-01-13 | 2009-01-13 | Loss-of-excitation protection auxiliary distinguishing element based on measured value of generator stator circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201464549U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944857A (en) * | 2012-11-23 | 2013-02-27 | 上海中科深江电动车辆有限公司 | Method for detecting loss of field of rotor of permanent magnet synchronous motor |
| CN103454585A (en) * | 2013-08-27 | 2013-12-18 | 河海大学 | Permanent magnet synchronous motor field failure diagnosis method based on residual voltage after ac dump |
-
2009
- 2009-01-13 CN CN2009200382138U patent/CN201464549U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944857A (en) * | 2012-11-23 | 2013-02-27 | 上海中科深江电动车辆有限公司 | Method for detecting loss of field of rotor of permanent magnet synchronous motor |
| CN102944857B (en) * | 2012-11-23 | 2015-02-18 | 上海中科深江电动车辆有限公司 | Method for detecting loss of field of rotor of permanent magnet synchronous motor |
| CN103454585A (en) * | 2013-08-27 | 2013-12-18 | 河海大学 | Permanent magnet synchronous motor field failure diagnosis method based on residual voltage after ac dump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20171211 Address after: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Co-patentee after: NARI Technology Development Co., Ltd. Patentee after: State Grid Electric Power Research Insititute Address before: Nanjing City, Jiangsu Province, 210003 South Shui Road No. 8 Co-patentee before: Nanjing Nari Co., Ltd. Patentee before: State Grid Electric Power Research Insititute |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100512 |
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| CX01 | Expiry of patent term |