CN202663346U - Field suppression and overvoltage protection device for excitation system of direct current exciter - Google Patents
Field suppression and overvoltage protection device for excitation system of direct current exciter Download PDFInfo
- Publication number
- CN202663346U CN202663346U CN 201220361285 CN201220361285U CN202663346U CN 202663346 U CN202663346 U CN 202663346U CN 201220361285 CN201220361285 CN 201220361285 CN 201220361285 U CN201220361285 U CN 201220361285U CN 202663346 U CN202663346 U CN 202663346U
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- protection device
- overvoltage protection
- field suppression
- overvoltage
- power supply
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Abstract
The utility model relates to a field suppression and overvoltage protection device for an excitation system of a direct current exciter, belonging to the technical field of field suppression and overvoltage protection of rotor windings of generators. The field suppression and overvoltage protection device consists of a rectifying power supply, a field suppression switch, an excitation power supply side overvoltage protector, an open-phase and big-slip-frequency asynchronous operation protector, a current transformer and a field suppression and overvoltage protector. The field suppression and overvoltage protector is combined with multiple overvoltage absorbers and protectors, so that the rotor windings are protected comprehensively; a fuse is arranged in each sub-circuit, so that when part of the sub-circuits fail, the corresponding fuses are fused quickly to ensure that the faulted sub-circuits are cut off; and diode rectifiers and the excitation system of the direct current exciter, in which power supply side overvoltage is easily generated, are particularly protected by using the excitation power supply side overvoltage protector. The field suppression and overvoltage protection device is high in field suppression capacity, high in field suppression speed and high in power supply side overvoltage protection capacity, and can effectively guarantee the operation safety of the rotor windings.
Description
Technical field
The utility model relates to generator amature winding demagnetization and over-voltage protection technique field.
Background technology
The inside of generation current unit or generator outlet end break down and all want the fast shut-off field power supply during orderly closedown; because the generator amature winding is the large inductance of an energy storage; therefore the exciting current abrupt potential must cause sizable temporary overvoltage at rotor winding two ends; cause rotor insulation to puncture; so must as early as possible the magnetic energy in the inductor rotor be consumed fast; and diode rectification and DC exciter excitation system; the forward overvoltage of normal emerged in operation and field suppression switch divide the overvoltage of the power generation that have no progeny mains side line inductance and transformer leakage inductance store very high, and the safety of generator assembly is had sizable threat.
The utility model content
It is strong that the purpose of this utility model provides a kind of de-excitation ability, and demagnetization speed is fast, and mains side overvoltage protection ability is strong, reliable DC exciter excitation system demagnetization and overvoltage protection.
In order to solve existing problem in the background technology, the utility model is by the following technical solutions: it comprises rectifier power source LP, field suppression switch FMK, field power supply side overvoltage protection device FB, non-large-slip asynchronous operation protection device FQ, Current Transmit, the demagnetization overvoltage protection device FM of entirely reaching mutually;
Described rectifier power source LP and field suppression switch FMK are connected in series in the energized circuit and are connected to rotor winding two ends; field power supply side overvoltage protection device FB is parallel to rotor winding two ends, and non-entirely reaching mutually connected with Current Transmit after large-slip asynchronous operation protection device FQ and the demagnetization overvoltage protection device FM parallel connection again and then be parallel to rotor winding two ends.Rotor voltage was low when generator ran well; the resistance of demagnetization overvoltage protection device FM is high-impedance state; the non-large-slip asynchronous operation protection device FQ that entirely reaches mutually is in open-circuit condition; leakage current only is microampere order; during demagnetization; field suppression switch FMK tripping; cut off rectifier power source LP; electric current is forced among the demagnetization overvoltage protection device FM when reaching certain condition; stored energy is consumed in the rotor winding; under rotor demagnetization operating mode; because of the non-large-slip asynchronous operation protection device FQ conducting voltage that entirely reaches mutually far above the demagnetization conducting voltage; so can not participate in demagnetization work; when non-full phase or large-slip asynchronous operation generation inverse overvoltage occurring, the non-large-slip asynchronous operation protection device FQ that entirely reaches mutually enters operating state, and overvoltage is limited in the allowed band; then limited by field power supply side overvoltage protection device during such as the mains side overtension, thereby ensured that rotor is injury-free.
DC exciter excitation system demagnetization of the present utility model and overvoltage protection; adopt the mode of the multiple protective device combinations such as demagnetization overvoltage protection device demagnetization and field power supply side overvoltage protection device to come the rotor winding to be protected comprehensively; fuse all is housed in each branch road; when the part branch road breaks down; its corresponding fuse quick fuse; the voltage that produces is forced into rapidly other branch roads with the short circuit current of fault branch; fault branch is cut, has used especially field power supply side overvoltage protection device to protect for the mains side overvoltage that easily produces in diode rectification and the DC exciter excitation system.Thereby the utility model de-excitation ability is strong, and demagnetization speed is fast, and mains side overvoltage protection ability is strong, has effectively protected the security of operation of rotor winding.
Description of drawings
Fig. 1 is electrical schematic diagram of the present utility model
Embodiment
Referring to Fig. 1, a kind of DC exciter excitation system demagnetization and overvoltage protection, it comprises rectifier power source LP, field suppression switch FMK, field power supply side overvoltage protection device FB, non-large-slip asynchronous operation protection device FQ, Current Transmit, the demagnetization overvoltage protection device FM of entirely reaching mutually;
Described rectifier power source LP and field suppression switch FMK are connected in series in the energized circuit and are connected to rotor winding two ends; field power supply side overvoltage protection device FB is parallel to rotor winding two ends, and non-entirely reaching mutually connected with Current Transmit after large-slip asynchronous operation protection device FQ and the demagnetization overvoltage protection device FM parallel connection again and then be parallel to rotor winding two ends.Rotor voltage was low when generator ran well; the resistance of demagnetization overvoltage protection device FM is high-impedance state; the non-large-slip asynchronous operation protection device FQ that entirely reaches mutually is in open-circuit condition; leakage current only is microampere order; during demagnetization; field suppression switch FMK tripping; cut off rectifier power source LP; electric current is forced among the demagnetization overvoltage protection device FM when reaching certain condition; stored energy is consumed in the rotor winding; under rotor demagnetization operating mode; because of the non-large-slip asynchronous operation protection device FQ conducting voltage that entirely reaches mutually far above the demagnetization conducting voltage; so can not participate in demagnetization work; when non-full phase or large-slip asynchronous operation generation inverse overvoltage occurring, the non-large-slip asynchronous operation protection device FQ that entirely reaches mutually enters operating state, and overvoltage is limited in the allowed band; then limited by field power supply side overvoltage protection device during such as the mains side overtension, thereby ensured that rotor is injury-free.
DC exciter excitation system demagnetization of the present utility model and overvoltage protection; adopt the mode of the multiple protective device combinations such as demagnetization overvoltage protection device demagnetization and field power supply side overvoltage protection device to come the rotor winding to be protected comprehensively; fuse all is housed in each branch road; when the part branch road breaks down; its corresponding fuse quick fuse; the voltage that produces is forced into rapidly other branch roads with the short circuit current of fault branch; fault branch is cut, has used especially field power supply side overvoltage protection device to protect for the mains side overvoltage that easily produces in diode rectification and the DC exciter excitation system.Thereby the utility model de-excitation ability is strong, and demagnetization speed is fast, and mains side overvoltage protection ability is strong, has effectively protected the security of operation of rotor winding.
Claims (1)
1. a DC exciter excitation system demagnetization and overvoltage protection, it is characterized in that it comprises rectifier power source (LP), field suppression switch (FMK), field power supply side overvoltage protection device (FB), non-large-slip asynchronous operation protection device (FQ), current transformer (CT), the demagnetization overvoltage protection device (FM) of entirely reaching mutually;
Described rectifier power source (LP) is connected in series in the energized circuit with field suppression switch (FMK) and is connected to rotor winding two ends; field power supply side overvoltage protection device (FB) is parallel to rotor winding two ends, and non-entirely reaching mutually connected with current transformer (CT) after large-slip asynchronous operation protection device (FQ) and demagnetization overvoltage protection device (FM) parallel connection again and then be parallel to rotor winding two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220361285 CN202663346U (en) | 2012-07-19 | 2012-07-19 | Field suppression and overvoltage protection device for excitation system of direct current exciter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220361285 CN202663346U (en) | 2012-07-19 | 2012-07-19 | Field suppression and overvoltage protection device for excitation system of direct current exciter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202663346U true CN202663346U (en) | 2013-01-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220361285 Expired - Fee Related CN202663346U (en) | 2012-07-19 | 2012-07-19 | Field suppression and overvoltage protection device for excitation system of direct current exciter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202663346U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934940A (en) * | 2015-07-23 | 2015-09-23 | 合肥扬帆通信元器件有限公司 | Field discharge and overvoltage protection device for generator rotor |
| CN108318813A (en) * | 2018-04-16 | 2018-07-24 | 国家电网公司 | A kind of direct current calibration equipment suitable for rotor over-voltage protection device |
| CN108490346A (en) * | 2018-05-18 | 2018-09-04 | 北京北重汽轮电机有限责任公司 | A kind of rotating fuse monitoring method and device |
-
2012
- 2012-07-19 CN CN 201220361285 patent/CN202663346U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934940A (en) * | 2015-07-23 | 2015-09-23 | 合肥扬帆通信元器件有限公司 | Field discharge and overvoltage protection device for generator rotor |
| CN108318813A (en) * | 2018-04-16 | 2018-07-24 | 国家电网公司 | A kind of direct current calibration equipment suitable for rotor over-voltage protection device |
| CN108490346A (en) * | 2018-05-18 | 2018-09-04 | 北京北重汽轮电机有限责任公司 | A kind of rotating fuse monitoring method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20130109 Termination date: 20140719 |
|
| EXPY | Termination of patent right or utility model |