CN201004550Y - Magnetism extinguishment over voltage protection circuit for power generator - Google Patents
Magnetism extinguishment over voltage protection circuit for power generator Download PDFInfo
- Publication number
- CN201004550Y CN201004550Y CNU2007200338920U CN200720033892U CN201004550Y CN 201004550 Y CN201004550 Y CN 201004550Y CN U2007200338920 U CNU2007200338920 U CN U2007200338920U CN 200720033892 U CN200720033892 U CN 200720033892U CN 201004550 Y CN201004550 Y CN 201004550Y
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- generator
- voltage protection
- linear resistance
- demagnetization
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Abstract
The utility model relates to a dynamo demagnetization over-voltage protection circuit which is parallelly connected into the dynamo rotor loop and comprises a non-linear resistance, controlled silicon. The utility model is characterized in that two controlled silicon parallelly connect reversely and then connect the over-current relay as well as the non-linear resistance, and a pair of burst into nodes of the over-current relay connect with the demagnetization switch tripping operation control loop. The circuit has more reliable over-voltage protection function because of adding the over-current relay in the over-voltage protection loop and can prevent the non-linear resistance from burning down because of breaking-over for long time, thus can protect the dynamo open-phase to minish damage. two controlled silicon parallelly connect reversely thus no drain current is existed and survival life of the non-linear resistance is prolonged so that the electric generating set, in particular to large electric generating unit can run safely, long and steadily.
Description
Affiliated technical field
The utility model relates to the design of a kind of generator amature demagnetization and excess voltage protection, belongs to power system excitation control technology field.
Background technology
As everyone knows, the demagnetization of generator amature and overvoltage protection, operation has significance for the long-term safety of generator itself and unit.When internal fault of electric generator or generation overvoltage, for the influence of accident being reduced to minimum, require de-excitation system to shift away the electromagnetic energy of generator amature with the fastest speed, make generator voltage drop to zero apace.In recent years, along with the continuous increase of generator unit capacity, the generator amature demagnetization has also been realized changing by type to moving from energy-dissipating type, is converted into non-linear demagnetization from linear demagnetization.
At present; generator amature from and the electrical principle that encourages magnetic loop as shown in Figure 1; the three-phase alternating-current supply ABC that takes from generator end is after controllable silicon full-controlled rectifier bridge SCR rectification, and the output direct current inserts generator amature Wf through field suppression switch FMK and demagnetization and excess voltage protection (shown in the frame of broken lines) back in parallel with generator amature Wf.Wherein, demagnetization and excess voltage protection are composed in series with nonlinear resistance (de-excitation resistance) Rn after by controllable silicon Th1 and diode D reverse parallel connection again, and FMK-1 is the normally closed auxiliary contact of field suppression switch FMK among the figure.During demagnetization, direct current field suppression switch FMK disjunction utilizes the electric arc that produces; set up enough arc voltages; utilize this voltage to come the conducting nonlinear resistance, generator rotor current is transferred to demagnetization and excess voltage protection, consume the energy that moves of generator amature by nonlinear resistance Rn heating.Over-voltage protecting function is to realize by the controllable silicon Th1 of reverse parallel connection and diode D.Therefore; it is particularly important just to seem in the reliability in the demagnetization of generator and overvoltage protection loop and useful life, and this wherein, and nonlinear resistance is crucial; it is bearing the important task that demagnetization consumes rotor magnetic energy and absorbs the overvoltage energy, so it is particularly important to seem its useful life.But, work as generating set, especially Generator Set takes place non-when reaching the large-slip asynchronous operation mutually entirely, can produce very strong overvoltage, may cause nonlinear resistance Rn to burn when serious, and then cause rotor to damage, bring about great losses because of long-time big electric current continues conducting.In addition, when adopting silicon carbide nonlinear resistor, because the existence of diode D, the leakage current of demagnetization and excess voltage protection is bigger, causes the life-span of nonlinear resistance Rn to shorten greatly (can not considering when adopting znr).
Summary of the invention
Technical problem to be solved in the utility model is: overcome the shortcoming of prior art, a kind of eliminating magnetism of generator overvoltage crowbar is provided.
The technical scheme in the invention for solving the technical problem is as follows: a kind of eliminating magnetism of generator overvoltage crowbar; the Generator's Rotor Circuit that inserts in parallel; form and comprise nonlinear resistance, controllable silicon; it is characterized in that by behind two controllable silicon reverse parallel connections; series overcurrent relay and nonlinear resistance are formed again, and a pair of node of leaving of described overcurrent relay is connected with rotor field suppression switch tripping operation control loop.
The beneficial effects of the utility model are as follows: owing to added overcurrent relay in the overvoltage protection loop, make overvoltage protection more safe and reliable, simultaneously, realized the protection to nonlinear resistance.When the non-large-slip asynchronous operation that reaches mutually entirely takes place generator; when producing very strong overvoltage; the overvoltage trigger module of field regulator sends the conducting of pulse-triggered controllable silicon; then; the overcurrent relay action; start and jump the field suppression switch shutdown procedure; avoid nonlinear resistance and burn because of long-time conducting; thereby generating set is played the non-whole phase protection effect; reduce causality loss; by connecting with nonlinear resistance behind two controllable silicon reverse parallel connections; when having realized positive and negative overvoltage protection; there is leakage current hardly; no matter nonlinear resistance is carborundum or zinc oxide, has prolonged the useful life of nonlinear resistance greatly, makes generating set; especially the safety of Generator Set and operation steady in a long-term are protected.
Description of drawings
Fig. 1 is existing generator excited system electrical principle schematic diagram.
Fig. 2 is the electrical principle schematic diagram of the utility model eliminating magnetism of generator overvoltage crowbar.
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 Fig. 2 frame of broken lines; the utility model eliminating magnetism of generator overvoltage crowbar; form and to comprise nonlinear resistance Rn, two controllable silicon Th1, Th2, overcurrent relay GLJ; behind two controllable silicon Th1, Th2 reverse parallel connection; series overcurrent relay GLJ and nonlinear resistance Rn again; the generator amature wf loop of inserting in parallel, a pair of node GLJ-1 that leaves of described overcurrent relay GLJ is connected with field suppression switch tripping operation control loop.FMK-1 is the normally closed auxiliary contact of field suppression switch among the figure.
For generating set being played better non-whole phase protection effect; effectively to avoid accident to enlarge; among the embodiment further feature be: a pair of node GLJ-1 that leaves of described overcurrent relay GLJ with when field suppression switch tripping operation control loop is connected, also is connected with the generator outlet switch.
The current setting value of overcurrent relay GLJ should be adjusted in conjunction with the operating condition of generator actual capabilities.This value can not be adjusted too little, and to prevent after the conducting of instantaneous overvoltage jumper is arranged overcurrent relay GLJ action, that can not adjust is too big, in order to avoid accident enlarges and the long-time conducting of nonlinear resistance Rn and burning.
This setting value can be for reference a kind of choosing method: calculate near the unloaded rated excitation voltage of generator, the jumper conducting, this moment, the current value by overcurrent relay moved set point as it.
Example: the generator off-load excitation voltage is U
0=200V, the voltage-current characteristic of nonlinear resistance is taken as U=20i
0.4Thereby, can calculate current setting
Overcurrent relay GLJ adopts Siemens's model: 3UG 1304-1D-Z, and operating current: DC 300-600A, can adjust.So we can adjust knob by overcurrent relay GLJ current setting value, the operating value of overcurrent relay is adjusted to be to meet the demands 300A.
Claims (2)
1, eliminating magnetism of generator overvoltage crowbar; the Generator's Rotor Circuit that inserts in parallel; form and comprise nonlinear resistance, controllable silicon; it is characterized in that by behind two controllable silicon reverse parallel connections; series overcurrent relay and nonlinear resistance are formed again, and a pair of node of leaving of described overcurrent relay is connected with rotor field suppression switch tripping operation control loop.
2, eliminating magnetism of generator overvoltage crowbar according to claim 1 is characterized in that a pair of node of leaving of described overcurrent relay also is connected with the generator outlet switch simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200338920U CN201004550Y (en) | 2007-01-31 | 2007-01-31 | Magnetism extinguishment over voltage protection circuit for power generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200338920U CN201004550Y (en) | 2007-01-31 | 2007-01-31 | Magnetism extinguishment over voltage protection circuit for power generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201004550Y true CN201004550Y (en) | 2008-01-09 |
Family
ID=39040093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200338920U Expired - Lifetime CN201004550Y (en) | 2007-01-31 | 2007-01-31 | Magnetism extinguishment over voltage protection circuit for power generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201004550Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101977004A (en) * | 2010-08-18 | 2011-02-16 | 国电南瑞科技股份有限公司 | Large current deexcitation loop based on silicon controlled rectifier subject to multi-redundancy trigger of jumper |
| CN101783497B (en) * | 2010-01-27 | 2013-05-29 | 东方电气集团东方电机有限公司 | Multi-mode redundant field suppression protection loop |
-
2007
- 2007-01-31 CN CNU2007200338920U patent/CN201004550Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101783497B (en) * | 2010-01-27 | 2013-05-29 | 东方电气集团东方电机有限公司 | Multi-mode redundant field suppression protection loop |
| CN101977004A (en) * | 2010-08-18 | 2011-02-16 | 国电南瑞科技股份有限公司 | Large current deexcitation loop based on silicon controlled rectifier subject to multi-redundancy trigger of jumper |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: CO-PATENTEE TO: NANJING NANRUI GROUP CO.,LTD. ^ |
|
| CU01 | Correction of utility model |
Correction item: Co-patentee Correct: Nanjing NARI Group Corporation. Number: 02 Page: The title page Volume: 24 |
|
| CU03 | Publication of corrected utility model |
Correction item: Co-patentee Correct: Nanjing NARI Group Corporation. Number: 02 Volume: 24 |
|
| ERR | Gazette correction |
Free format text: CORRECT: CO-PATENTEE; FROM: NONE ^ TO: NANJING NANRUI GROUP CO.,LTD. ^ |
|
| ASS | Succession or assignment of patent right |
Owner name: GUODIAN NANNUI TECH CO., LTD. Free format text: FORMER OWNER: STATE NETWORK ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20100129 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| C56 | Change in the name or address of the patentee |
Owner name: STATE NETWORK ELECTRIC POWER RESEARCH INSTITUTE Free format text: FORMER NAME: NANJING AUTOMATION RESEARCH INSTITUTE |
|
| CP03 | Change of name, title or address |
Address after: Nanjing City, Jiangsu Province, Nan Shui Road No. 8, zip code: 210003 Co-patentee after: NANJING NARI Group Corp. Patentee after: STATE GRID ELECTRIC POWER Research Institute Address before: Nanjing City, Jiangsu Province, Nan Shui Road No. 8, zip code: 210003 Co-patentee before: NANJING NARI Group Corp. Patentee before: Nanjing Automation Research Institute |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20100129 Address after: High road Nanjing high tech Development Zone, Nanjing City, Jiangsu Province, No. 20, zip code: 210061 Patentee after: NARI TECHNOLOGY Co.,Ltd. Address before: Nanjing City, Jiangsu Province, Nan Shui Road No. 8, zip code: 210003 Co-patentee before: NANJING NARI Group Corp. Patentee before: STATE GRID ELECTRIC POWER Research Institute |
|
| CX01 | Expiry of patent term |
Granted publication date: 20080109 |