CN202050239U - Controllable rapid discharge device for aiding in on/off of high-voltage shunt capacitor - Google Patents
Controllable rapid discharge device for aiding in on/off of high-voltage shunt capacitor Download PDFInfo
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- CN202050239U CN202050239U CN2011201510624U CN201120151062U CN202050239U CN 202050239 U CN202050239 U CN 202050239U CN 2011201510624 U CN2011201510624 U CN 2011201510624U CN 201120151062 U CN201120151062 U CN 201120151062U CN 202050239 U CN202050239 U CN 202050239U
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- circuit breaker
- voltage
- electronic device
- shunt capacitor
- resistor
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Abstract
The utility model discloses a controllable rapid discharge device for aiding in the on/off of a high-voltage shunt capacitor. The device comprises a high-voltage shunt capacitor, a circuit breaker, a power source and an electrical/electronic device controller, wherein the high-voltage shunt capacitor is connected the power source with through the circuit breaker, a resistor is connected in parallel with the high-voltage shunt capacitor, a grounded electrical/electronic device is connected to the resistor, a current transformer is connected between the connection point of the high-voltage shunt capacitor and the resistor and the circuit breaker, and the electrical/electronic device controller is connected with the current transformer, a circuit breaker controller for the circuit breaker and the electrical/electronic device. The electrical/electronic device controller is adopted to detect the working signals of the circuit breaker controller and the current transformer and control the on/off of the discharge loop of the high-voltage shunt capacitor and the resistor, so that the high-voltage shunt capacitor discharges rapidly and the residual voltage of the high-voltage shunt capacitor and the voltages at the two ends of the arc-extinguishing chamber of the circuit breaker are rapidly reduced, which greatly protect the circuit breaker from breakdown.
Description
Technical field
The utility model relates to a kind of electrical installation, especially a kind of auxiliary controlled repid discharge device that cut-offs high-voltage parallel capacitor.
Background technology
At present, after circuit breaker cut-off the power supply of high-voltage parallel capacitor, the capacitor device residual voltage was power-supply system voltage (U
N) maximum (
U
N), residual voltage reduces gradually, but almost remains unchanged at short notice, so arc-extinguishing chamber of circuit breaker bears the stack that overvoltage is capacitor residual voltage and system voltage in capacitor cut-offs the back short time:
U
N+ U
NSo the 35kV high-voltage parallel capacitor generally requires to be equipped with the circuit breaker of 72.5kV rated voltage, but because the circuit breaker rated voltage is limited, for example, the 550kV capacitor can only be equipped with the circuit breaker of 550kV.This causes the capacitor circuit breaker that the flashover breakdown accident takes place easily.
Summary of the invention
The purpose of this utility model is: a kind of auxiliary controlled repid discharge device that cut-offs high-voltage parallel capacitor is provided, it can cut-off the back at high-voltage parallel capacitor and reduce capacitor residual voltage and circuit breaker overvoltage rapidly, reduce the possibility of circuit breaker generation breakdown accident, to overcome the deficiencies in the prior art.
The utility model is achieved in that the auxiliary controlled repid discharge device that cut-offs high-voltage parallel capacitor, comprise high-voltage parallel capacitor, circuit breaker, power supply, power electronic device controller, high-voltage parallel capacitor is connected with power supply by circuit breaker, on high-voltage parallel capacitor, be parallel with resistor, on resistor, be connected with the power electronic device of a ground connection; Be connected with current transformer between the tie point of high-voltage parallel capacitor and resistor and circuit breaker, the power electronic device controller is connected with the breaker controller and the power electronic device of current transformer, circuit breaker.
The high-voltage parallel power capacitor is mainly used in the power factor (PF) that improves 50Hz power frequency electric power system.
Resistor (Resistor) generally directly is called resistance in daily life.Be a current limiting element, be connected on resistance in the circuit after, the resistance of resistor is that what to be fixed generally is two pins, but the size of current on its institute chord road of its restricted passage.The unalterable fixed resistor that is called of resistance.Resistance is variable is called potentiometer or variable resistance.Desirable resistor is linear, promptly the transient current by resistor with add instantaneous voltage and be directly proportional.The variable resistance that is used for dividing potential drop.On exposed resistive element, pressing one or two and can move hard contact.Contact position is determined the resistance between arbitrary end of resistive element and contact.
Circuit breaker is the electrical equipment that closes operating current in the high-tension circuit or fault current in order to cut off or to close.
Circuit breaker is divided into primary cut-out and low-voltage circuit breaker by its scope of application, and the high-low pressure identification of boundaries is fuzzyyer, and is general with the High-Voltage Electrical Appliances that are called more than the 3kV.Low-voltage circuit breaker claims automatic switch again, is commonly called as ＂ air switch ＂ and also is meant low-voltage circuit breaker, and it is a kind of existing hand switch effect, can carry out decompression, under-voltage, overload and the electrical equipment of short-circuit protection again automatically.It can be used to distribute electric energy; do not start asynchronous motor continually; power circuit and motor etc. are carried out protection, can automatic shutdown circuit when serious overload or short circuit and fault such as under-voltage take place for their, its function is equivalent to Fuse switch and the combination of crossing underheat relay etc.And behind the disjunction fault current, generally do not need to change parts, obtained to use widely.
Primary cut-out (or claiming high-voltage switch gear) is the main electric control appliance of power plant, electric substation, has arc quenching characteristic, and when system normally moved, it can cut off and connect the zero load and the load current of circuit and various electric equipments; When system broke down, it and relaying protection cooperated, and energy is the disengagement failure electric current rapidly, to prevent expansion accident scope.Therefore, the quality of primary cut-out work directly has influence on the safe operation of electric power system; The primary cut-out kind is a lot, and the difference by its arc extinguishing can be divided into: oil circuit breaker (bulk-oil circuit-breaker, oil-minimum breaker), sulfur hexafluoride breaker (SF6 circuit breaker), vacuum circuit-breaker, compressed-air circuit breaker etc.
Current transformer (instrument transformer) is the equipment of scaling transformation voltage or electric current.Its function mainly is that high voltage or big electric current scaling transformation are become standard low-voltage (100V) or the little electric current of standard (5A or 10A all refer to rated value), so that realize standardization, the miniaturization of measuring instrument, protection equipment and automatic control equipment.Instrument transformer also can be used to separate high-voltage system simultaneously, to guarantee the safety of the person and equipment.The equipment of scaling transformation voltage or electric current.
Current transformer schematic circuit micro-transformer of current and transformer ' s type be like also being according to electromagnetic induction principle work, the transformer conversion be voltage and micro-transformer of current conversion be electric current.Winding N1 connects tested electric current, is called winding (or former limit winding, elementary winding); Winding N2 connects measuring instrument, is called secondary winding (or secondary winding, secondary winding).
Power electronic device (Power Electronic Device) is called power semiconductor again, is used for high-power (it is tens of to thousands of peaces being often referred to electric current, and voltage is more than hundreds of volts) electronic device of transformation of electrical energy and electrical energy control circuit.
The 1950's, power electronic device mainly is mercury arc thyratron and high power valve.The thyristor that grows up the sixties because of its reliable operation, the life-span is long, volume is little, switching speed is fast, and is used widely in Power Electronic Circuit.At the initial stage seventies, progressively replaced the mercury arc thyratron.The eighties, the switching current of triode thyristor has reached thousands of peaces, and the forward and reverse operating voltage that can bear reaches thousands of volts.On this basis, for adapting to the needs of Development of Power Electronic Technology, develop a series of derivation devices such as gate level turn-off thyristor, bidirectional thyristor, photo thyristor, reverse conducting triode thyristor again, and novel electric power electric devices such as one pole type MOS power field effect transistor, bipolar power transistor, static induction thyristor, function combinations module and power integrated circuit.
Owing to adopted technique scheme, compared with prior art, the utility model detects the working signal of breaker controller summation current transformer by the power electronic device controller, after detecting circuit breaker and cut-offfing, the power electronic device controller will be controlled the discharge loop conducting of high-voltage parallel capacitor and resistor, high-voltage parallel capacitor is discharged rapidly, and the arc control device both end voltage of its residual voltage and circuit breaker reduces rapidly, the possibility of having avoided circuit breaker to avoid puncturing greatly.The utility model is simple in structure, and is with low cost, and result of use is good.
Description of drawings
Accompanying drawing 1 is a structural representation of the present utility model.
Embodiment
Embodiment of the present utility model: the structure of the auxiliary controlled repid discharge device that cut-offs high-voltage parallel capacitor as shown in Figure 1, high-voltage parallel capacitor 1 is connected with power supply 5 by circuit breaker 4, resistor 2 in parallel is connecting the power electronic device 8(of a ground connection such as thyristor on the resistor 2 on high-voltage parallel capacitor 1); Current transformer 3 is installed between the tie point of high-voltage parallel capacitor 1 and resistor 2 and circuit breaker 4, power electronic device controller 7 is connected with the breaker controller 6 and the power electronic device 8 of current transformer 3, circuit breaker 4 (power electronic device controller 7 is to be used to control that power electronic device 8 disconnects or the electronic component of conducting, it also needs to be connected with current transformer 3 and breaker controller 6, to receive their working signal, and judge according to the signal that receives, automatically power electronic device 8 is controlled).Above element all adopts commercially available conventional element.
The parameter of resistor 2 is to determine according to the parameter of high-voltage parallel capacitor 1 and circuit breaker 4, and the standard of its selection is to guarantee in the suitable time residual voltage is reduced to suitable level.
After circuit breaker 4 cut-offs, cut-off signal summation current transformer 3 electric currents that power electronic device controller 7 will detect breaker controller 6 simultaneously are 0 signal, at this moment, power electronic device controller 7 will be opened power electronic device 8, make the discharge loop conducting of high-voltage parallel capacitor 1 and resistor 2, high-voltage parallel capacitor 1 discharges rapidly, and its residual voltage and circuit breaker 4 arc control device both end voltage are reduced rapidly, avoids circuit breaker 4 breakdown.
Claims (1)
1. assist the controlled repid discharge device that cut-offs high-voltage parallel capacitor for one kind, comprise high-voltage parallel capacitor (1), circuit breaker (4), power supply (5), power electronic device controller (7), high-voltage parallel capacitor (1) is connected with power supply (5) by circuit breaker (4), it is characterized in that: on high-voltage parallel capacitor (1), be parallel with resistor (2), on resistor (2), be connected with the power electronic device (8) of a ground connection; Be connected with current transformer (3) between the tie point of high-voltage parallel capacitor (1) and resistor (2) and circuit breaker (4), power electronic device controller (7) is connected with the breaker controller (6) and the power electronic device (8) of current transformer (3), circuit breaker (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201510624U CN202050239U (en) | 2011-05-13 | 2011-05-13 | Controllable rapid discharge device for aiding in on/off of high-voltage shunt capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201510624U CN202050239U (en) | 2011-05-13 | 2011-05-13 | Controllable rapid discharge device for aiding in on/off of high-voltage shunt capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202050239U true CN202050239U (en) | 2011-11-23 |
Family
ID=44990532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201510624U Expired - Fee Related CN202050239U (en) | 2011-05-13 | 2011-05-13 | Controllable rapid discharge device for aiding in on/off of high-voltage shunt capacitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202050239U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474314A (en) * | 2019-09-03 | 2019-11-19 | 国家电网有限公司 | A kind of shunt capacitor overvoltage absorbing device |
| CN110518598A (en) * | 2019-09-02 | 2019-11-29 | 国家电网有限公司 | A kind of overvoltage elimination system |
-
2011
- 2011-05-13 CN CN2011201510624U patent/CN202050239U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110518598A (en) * | 2019-09-02 | 2019-11-29 | 国家电网有限公司 | A kind of overvoltage elimination system |
| CN110474314A (en) * | 2019-09-03 | 2019-11-19 | 国家电网有限公司 | A kind of shunt capacitor overvoltage absorbing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111123 Termination date: 20130513 |