CN104934940A - Field discharge and overvoltage protection device for generator rotor - Google Patents
Field discharge and overvoltage protection device for generator rotor Download PDFInfo
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- CN104934940A CN104934940A CN201510436260.8A CN201510436260A CN104934940A CN 104934940 A CN104934940 A CN 104934940A CN 201510436260 A CN201510436260 A CN 201510436260A CN 104934940 A CN104934940 A CN 104934940A
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- field discharge
- silicon controlled
- overvoltage
- overvoltage protection
- diode
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- Control Of Eletrric Generators (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
The invention discloses a field discharge and overvoltage protection device for a generator motor and relates to an overvoltage protection device of a silicon controlled rectifier excitation system. The field discharge and overvoltage protection device comprises a field discharge switch, a peak overvoltage absorber, a nonlinear resistor, a silicon controlled trigger, a silicon controlled rectifier, a diode, a current transformer, a first linear resistor and a second linear resistor. One end of the field discharge switch is connected with one end of the peak overvoltage absorber and is then connected with a rectification power source, the other end of the field discharge switch is connected with one end of the first linear resistor, one end of the second linear resistor and one end of the nonlinear resistor, the other end of the linear resistor is connected with the other end of the nonlinear resistor in parallel and is then connected with one end of the diode and one end of the silicon controlled rectifier, the other end of the linear resistor is connected with the silicon controlled trigger, the silicon controlled trigger is then connected with the other end of the silicon controlled rectifier, the other end of the diode and one end of the current transformer, and the other end of the current transformer is connected with the other end of the peak overvoltage absorber and is then connected with a rotor winding. The field discharge and overvoltage protection device is high in field discharge capability, high in field discharge speed and fast in overvoltage protection action, the rotor winding is protected against an open circuit, and the accident of insulation breakdown of the rotor winding is effectively prevented.
Description
Technical field
The present invention relates to generator rotor de-excitation and over-voltage protection technique field, particularly relate to a kind of overvoltage protection of SCR rectification excitation system.
Background technology
The inside of generating set or generator outlet end break down and orderly closedown time all want fast shut-off field power supply, due to the large inductance that rotor windings is an energy storage, therefore exciting current abrupt potential must cause sizable temporary overvoltage at rotor windings two ends, rotor insulation is caused to puncture, so demagnetization must be carried out to inductor rotor as early as possible, for SCR rectification excitation system, the reason such as non-three phase or non-Switching Synchronization because of generator open circuit can make generator non-whole phase operation or large-slip is different does not run, under these two kinds of operation conditionss, violent overvoltage will be produced in rotor windings, because the energy of now electrical network and field power supply all can pass in rotor windings, energy fortune exceedes the demagnetization energy of field suppression equipment, when the fuse in field suppression equipment all fuses, rotor windings is opened a way, now rotor windings is equivalent to constant-current source, the overvoltage produced will puncture the insulation of rotor windings, cause the damage of unit equipment.
Summary of the invention
The object of this invention is to provide a kind of generator rotor de-excitation and overvoltage protection, not only de-excitation ability is strong for it, and demagnetization speed is fast, and it is fast to cross electric industry protection act, and rotor windings can be avoided to open a way, and effective winding insulation breakdown accident of placing flies to occur.
In order to solve problem existing in background technology, the present invention is by the following technical solutions: it comprises field suppression switch FMK, peak overvoltage absorber SPA, nonlinear resistance FR, controllable silicon trigger CF, controllable silicon KPT, diode D, Current Transmit, linear resistance R1 and R2, rectifier power source is connect after described field suppression switch FMK one end is connected with peak overvoltage absorber SPA one end, the other end connects linear resistance R1 one end respectively, linear resistance R2 one end and nonlinear resistance FR one end linear resistance R1 other end in parallel with the nonlinear resistance FR other end after connect diode D one end and controllable silicon KPT one end, another termination silicon controlled toggle of linear resistance R2 CF, silicon controlled toggle CF is at the control silicon KPT other end of receiving lodgers respectively.The diode D other end and Current Transmit one end, the Current Transmit other end connects rotor windings after being connected with the peak overvoltage absorber SPA other end.
When generator circuit breaker can make generator non-whole phase operation or large-slip asynchronous operation because of the reason such as non-three phase or non-Switching Synchronization, violent forward overvoltage can be produced, the over-voltage measurement loop that linear resistance R2 and silicon controlled toggle CF forms will operate, send trigger impulse, controllable silicon KPT conducting, nonlinear resistance FR enters operating state, the overvoltage of restriction generator amature, protection rotor windings is without prejudice, when producing direction overvoltage, diode D branch road enters operating state, meanwhile, linear resistance R also participates in work, rotor overvoltage is made to be limited in allowed band, guarantee rotor is without prejudice, thus ensure that the safety of generating set.
The present invention it not only de-excitation ability is strong; demagnetization speed is fast; and it is fast to cross electric industry protection act; for generating set entirely mutually run or large-slip is different do not run time produce forward and reverse overvoltage; all effectively can control, make overpressure value in allowed band, thus avoid rotor windings open circuit; effectively prevent the generation of rotor windings dielectric breakdown accident, protect the security of operation of rotor windings.
Accompanying drawing explanation
Fig. 1 is electrical schematic diagram of the present invention.
Embodiment
See Fig. 1, a kind of generator rotor de-excitation and over-pressure safety device, it comprises field suppression switch FMK, peak overvoltage absorber SPA, nonlinear resistance FR, controllable silicon trigger CF, controllable silicon KPT, diode D, Current Transmit, linear resistance R1 and R2, rectifier power source is connect after described field suppression switch FMK one end is connected with peak overvoltage absorber SPA one end, the other end connects linear resistance R1 one end respectively, linear resistance R2 one end and nonlinear resistance FR one end linear resistance R1 other end in parallel with the nonlinear resistance FR other end after connect diode D one end and controllable silicon KPT one end, another termination silicon controlled toggle of linear resistance R2 CF, silicon controlled toggle CF is at the control silicon KPT other end of receiving lodgers respectively.The diode D other end and Current Transmit one end, the Current Transmit other end switches through sub-winding L Q after being connected with the peak overvoltage absorber SPA other end.
When generator circuit breaker can make generator non-whole phase operation or large-slip asynchronous operation because of the reason such as non-three phase or non-Switching Synchronization, violent forward overvoltage can be produced, the over-voltage measurement loop that linear resistance R2 and silicon controlled toggle CF forms will operate, send trigger impulse, controllable silicon KPT conducting, nonlinear resistance FR enters operating state, the overvoltage of restriction generator amature, protection rotor windings is without prejudice, when producing direction overvoltage, diode D branch road enters operating state, meanwhile, linear resistance R also participates in work, rotor overvoltage is made to be limited in allowed band, guarantee rotor is without prejudice, thus ensure that the safety of generating set.
The present invention it not only de-excitation ability is strong; demagnetization speed is fast; and it is fast to cross electric industry protection act; for generating set entirely mutually run or large-slip is different do not run time produce forward and reverse overvoltage; all effectively can control, make overpressure value in allowed band, thus avoid rotor windings open circuit; effectively prevent the generation of rotor windings dielectric breakdown accident, protect the security of operation of rotor windings.
Claims (1)
1. generator rotor de-excitation and overvoltage protection, it is characterized in that: it comprises it and comprises field suppression switch (FMK), peak overvoltage absorber (SPA), nonlinear resistance (FR), controllable silicon trigger (CF), controllable silicon KPT, diode (D), current transformer (CT), linear resistance (R1) and (R2), rectifier power source is connect after described field suppression switch (FMK) one end is connected with peak overvoltage absorber (SPA) one end, the other end connects linear resistance (R1) one end respectively, linear resistance (R2) one end and nonlinear resistance (FR) one end linear resistance (R1) other end in parallel with nonlinear resistance (FR) other end after connect diode (D) one end and controllable silicon (KPT) one end, another termination silicon controlled toggle (CF) of linear resistance (R2), silicon controlled toggle (CF) is at control silicon (KPT) other end of receiving lodgers respectively, diode (D) other end and current transformer (CT) one end, current transformer (CT) other end connects rotor windings (LQ) after being connected with peak overvoltage absorber (SPA) other end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510436260.8A CN104934940A (en) | 2015-07-23 | 2015-07-23 | Field discharge and overvoltage protection device for generator rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510436260.8A CN104934940A (en) | 2015-07-23 | 2015-07-23 | Field discharge and overvoltage protection device for generator rotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104934940A true CN104934940A (en) | 2015-09-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510436260.8A Pending CN104934940A (en) | 2015-07-23 | 2015-07-23 | Field discharge and overvoltage protection device for generator rotor |
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| CN (1) | CN104934940A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105141207A (en) * | 2015-10-19 | 2015-12-09 | 白山发电厂 | High-energy zinc oxide linear resistor and high-energy zinc oxide nonlinear resistor combined protection device for full voltage de-excitation |
Citations (5)
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|---|---|---|---|---|
| CN201601647U (en) * | 2009-11-10 | 2010-10-06 | 国电南瑞科技股份有限公司 | Combined de-excitation circuit of large power generator |
| CN202663346U (en) * | 2012-07-19 | 2013-01-09 | 安徽徽凯电气有限公司 | Field suppression and overvoltage protection device for excitation system of direct current exciter |
| CN103199519A (en) * | 2013-04-27 | 2013-07-10 | 合肥隆科电力设备有限责任公司 | Generator rotor field suppression and overvoltage protection device |
| CN104836204A (en) * | 2015-06-01 | 2015-08-12 | 安徽禄讯电子科技有限公司 | De-excitation and overvoltage protection device of generator rotor |
| CN105098715A (en) * | 2014-11-18 | 2015-11-25 | 芜湖蓝宙电子科技有限公司 | Generator rotor de-excitation and overvoltage protection device |
-
2015
- 2015-07-23 CN CN201510436260.8A patent/CN104934940A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201601647U (en) * | 2009-11-10 | 2010-10-06 | 国电南瑞科技股份有限公司 | Combined de-excitation circuit of large power generator |
| CN202663346U (en) * | 2012-07-19 | 2013-01-09 | 安徽徽凯电气有限公司 | Field suppression and overvoltage protection device for excitation system of direct current exciter |
| CN103199519A (en) * | 2013-04-27 | 2013-07-10 | 合肥隆科电力设备有限责任公司 | Generator rotor field suppression and overvoltage protection device |
| CN105098715A (en) * | 2014-11-18 | 2015-11-25 | 芜湖蓝宙电子科技有限公司 | Generator rotor de-excitation and overvoltage protection device |
| CN104836204A (en) * | 2015-06-01 | 2015-08-12 | 安徽禄讯电子科技有限公司 | De-excitation and overvoltage protection device of generator rotor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105141207A (en) * | 2015-10-19 | 2015-12-09 | 白山发电厂 | High-energy zinc oxide linear resistor and high-energy zinc oxide nonlinear resistor combined protection device for full voltage de-excitation |
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Application publication date: 20150923 |