CN2731691Y - High voltage current limiting breaking and overvoltage combined protector - Google Patents
High voltage current limiting breaking and overvoltage combined protector Download PDFInfo
- Publication number
- CN2731691Y CN2731691Y CN 200420079803 CN200420079803U CN2731691Y CN 2731691 Y CN2731691 Y CN 2731691Y CN 200420079803 CN200420079803 CN 200420079803 CN 200420079803 U CN200420079803 U CN 200420079803U CN 2731691 Y CN2731691 Y CN 2731691Y
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- high voltage
- current
- overvoltage
- voltage
- current limiting
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Abstract
The utility model discloses a high voltage current limiting breaking and overvoltage combined protector. A protecting branch is provided between a power cable and a protected device. The high voltage current limiting breaking and overvoltage combined protector is characterized in that the protecting branch is provided with a high voltage isolating switch QS, a high voltage vacuum switch QF and a high voltage current limiting fuse FU; wherein, the high voltage isolating switch QS, the high voltage vacuum switch QF and the high voltage current limiting fuse FU are connected in series; both ends of the high voltage current limiting fuse FU are parallely connected with high voltage ZnO pressure sensitive resistors RV; the high voltage current limiting fuse FU is provided with a striker system, the normally open contact of a travel switch is struck by the striker, and the normally open contact is arranged in the control loop of the high voltage vacuum switch. The high voltage current limiting breaking and overvoltage combined protector not only can bear the frequent switching on and breaking of running current, but also can automatically limit the electric current for very great short circuit current, and can break quickly and reliably for overvoltage protection.
Description
Technical field:
The utility model relates to overvoltage protection.
Background technology:
At present, electricity generation system is cut-off with vacuum circuit-breaker the open circuit protection of electric power branch roads such as the excitation transformer that directly is connected the generator outlet end, unit transformer branch road.In a single day when being short-circuited, because the impedance in its loop is less thereby short circuit current is big especially, this will cause very big difficulty to selecting to cut-off protection equipment, promptly allow to choose the jumbo protection equipment that cut-offs, its price is also high; Simultaneously, cut-offfing of traditional protection equipment that cut-offs reaches a few tens of milliseconds operate time, the amplitude of limiting short-circuit current fast and effeciently, and especially big short circuit current is to the insulation of electric equipments such as generator, the transformer effect that will impact; To moving stable, thermally-stabilised the having higher requirement of the miscellaneous equipment in the system, not only increase investment in addition to equipment, and dangerous.Equally, in the machine end power circuit of large synchronous generator because the moment of short circuit motor rely on its inertia still to keep the high speed rotating state, be similar to generator in the short time, will produce king-sized short circuit current, certainly will produce above-mentioned situation.
Summary of the invention:
The utility model is for avoiding above-mentioned existing in prior technology weak point, providing a kind of dependable performance, high-voltage and current-limitation cheap, that integrated protection is effective to open circuit and the overvoltage assembled protector.
The technical scheme that the utility model technical solution problem is adopted is:
The utility model is between power source bus and protected equipment the protection branch road to be set.
Design feature of the present utility model is to connect in the described protection branch road to be provided with: high voltage isolator QS, high-pressure vacuum switch QF and high-voltage and current-limitation fuse FU have been arranged in parallel high pressure high energy ZnO varistor RV at the two ends of described high-voltage and current-limitation fuse FU; Employing has the high-voltage and current-limitation fuse FU of striker system, and the normally open contact of the travel switch that is clashed into by its striker is arranged in the control loop of high-pressure vacuum switch.
Design feature of the present utility model also is also to connect in described protection branch road and is provided with: current transformer TA, and the combination overvoltage protector F that is arranged in parallel, the ground connection disconnecting link JD and the electrification display GSN that are positioned at protection branch road exit.
The utility model is under the load current of operate as normal, by high-pressure vacuum switch QF operation deciliter break-make, in case the loop is short-circuited, high-voltage and current-limitation fuse FU quick fuse in 2ms, cutting-off of short-circuit electric current immediately, the switching overvoltage that produces when by high pressure high energy ZnO varistor RV high-voltage and current-limitation fuse FU being cut-off simultaneously is limited in the setting, and the magnetic field energy when cut-off current decays to zero in the absorption system has further improved the energy-absorbing safe allowance of high-voltage and current-limitation fuse FU.Compared with the prior art, the beneficial effects of the utility model are embodied in:
The utility model is applicable to that the 3-35KV electric power system has the circuit of big capacity of short circuit, maximum connecting-disconnecting function can reach 100KA, be specially adapted to the direct connection electric power branch road of generator outlet end, for example: loops such as excitation transformer, station transformer, isolating transformer; Can bear the frequent connection of running current and cut-off, simultaneously can the volitional check electric current to especially big short circuit current and fast and reliable ground cut-off and carry out overvoltage protection.
Description of drawings:
Accompanying drawing is the utility model circuit theory diagrams.
Embodiment:
Referring to accompanying drawing; present embodiment is between power source bus and protected equipment the protection branch road to be set; connect in the protection branch road and be provided with: high voltage isolator QS, high-pressure vacuum switch QF and high-voltage and current-limitation fuse FU; at the two ends of high-voltage and current-limitation fuse FU, be arranged in parallel high pressure high energy ZnO varistor RV.Protected equipment comprises unit transformer and excitation change etc.
In concrete the enforcement, adopt the high-voltage and current-limitation fuse FU that has the striker system, the normally open contact of the travel switch that is clashed into by its striker is arranged in the control loop of high-pressure vacuum switch.In case high-voltage and current-limitation fuse FU fusing, its striker ejects immediately, touches travel switch by the insulation push rod, thereby controls the empty switch QF tripping operation of high straightening.As long as the phase fuse action on-load switch tripping operation that just links is arranged, like this, both avoided system's phase-deficient operation after the fuse blows, can link with stand-by power supply again, main frame is not stopped transport.If the generation three-phase shortcircuit, then a certain fusing earlier mutually may take place in three-phase fuse short circuit current flow all, and its striker system can start the vacuum switch tripping operation.But the intrinsic opening time of vacuum switch reaches tens ms, and the just fusing in several ms of the fuse of all the other two-phases, so the fuse that short circuit current is moved earlier already during the switch disjunction cuts off, need not worry the danger that vacuum switch is burnt.
In concrete the enforcement; in order to realize integrated protection; can also connect in the protection branch road and be provided with: current transformer TA, and the combination overvoltage protector F that is arranged in parallel, ground connection disconnecting link JD and electrification display GSN can also be provided with temperature and humidity controller in electrification display GSN loop.
In concrete the enforcement, protection branch road integral body is arranged in the high pressure armouring cabinet.According to the routine setting, this high pressure armouring cabinet should have " five anti-" function, promptly prevents mistake deciliter circuit breaker, prevents that the on-load branch from keeping apart the pass, prevent to be with the ground connection disconnecting link to send electricity, prevent charged splice grafting ground disconnecting link, preventing in the mistakenly entering into charged cabinet.
Version in the present embodiment mainly is to utilize the arc voltage of high-voltage and current-limitation fuse FU moment afterflow electric arc to limit and cutting-off of short-circuit electric current, high-voltage and current-limitation fuse FU is impact stroke switch in fusing, the normally open contact closure of travel switch, send the signal that cut-offs of high-pressure vacuum switch QF, switch trip by control loop.The overvoltage energy that is produced when high-voltage and current-limitation fuse FU fuses absorbs pressure limiting by the high pressure high energy ZnO varistor RV that is connected in parallel on its two ends.
Because the operating chacteristics of high-voltage and current-limitation fuse FU is guaranteed by its intrinsic ampere-time characteristic, need not the mechanical and electrical protection operation of equipment in any external world, so its reliable in action is high, can not produce tripping and malfunction phenomenon.And its responsiveness is far above mechanical chopper, short circuit current does not rise as yet, and this is cut off, current amplitude can be restricted to less than about 15% of prospective short circuit current transient peaks, time surpasses 2ms, make main frame, transformer and circuit breaker no longer be subjected to the impact of short circuit peak, avoided the damage of the electric equipment that causes because of several cycle heavy current impacts; Because the current limliting of high-voltage and current-limitation fuse FU and rapidity make I
2T is very little, can guarantee that transformer does not burst, and the bus connection need not be considered the dynamic and thermal stability problem.
High-pressure vacuum switch QF and high-voltage and current-limitation fuse FU have extremely strong current interruption ability, can produce great di/dt in the loop when cut-offfing, and can induce the higher overvoltage of blocking on inductive load.In order to protect the apparatus insulated superpotential infringement that is not subjected to; in the present embodiment; patented technology---the combination overvoltage protector have relatively with alternate overvoltage protection is set in the exit of protection branch road; the patent No. is 02264285.4; can be below setting with superpotential amplitude limitation, thus the insulation of protection electric equipment is not subjected to superpotential injury.
Claims (3)
1, high-voltage and current-limitation opens circuit and the overvoltage assembled protector, between power source bus and protected equipment, the protection branch road is set, it is characterized in that connecting in the described protection branch road and be provided with: high voltage isolator QS, high-pressure vacuum switch QF and high-voltage and current-limitation fuse FU have been arranged in parallel high pressure high energy ZnO varistor RV at the two ends of described high-voltage and current-limitation fuse FU; Employing has the high-voltage and current-limitation fuse FU of striker system, and the normally open contact of the travel switch that is clashed into by its striker is arranged in the control loop of high-pressure vacuum switch QF.
2, high-voltage and current-limitation according to claim 1 opens circuit and the overvoltage assembled protector; it is characterized in that in described protection branch road, connecting and be provided with: current transformer TA, and the combination overvoltage protector F that is arranged in parallel, the ground connection disconnecting link JD and the electrification display GSN that are positioned at protection branch road exit.
3, high-voltage and current-limitation according to claim 2 opens circuit and the overvoltage assembled protector, it is characterized in that described protection branch road integral body is arranged in the high pressure armouring cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420079803 CN2731691Y (en) | 2004-09-22 | 2004-09-22 | High voltage current limiting breaking and overvoltage combined protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420079803 CN2731691Y (en) | 2004-09-22 | 2004-09-22 | High voltage current limiting breaking and overvoltage combined protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2731691Y true CN2731691Y (en) | 2005-10-05 |
Family
ID=35052016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420079803 Expired - Fee Related CN2731691Y (en) | 2004-09-22 | 2004-09-22 | High voltage current limiting breaking and overvoltage combined protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2731691Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812086A (en) * | 2014-02-28 | 2014-05-21 | 中国能源建设集团广东省电力设计研究院 | High voltage electromotor protection system |
-
2004
- 2004-09-22 CN CN 200420079803 patent/CN2731691Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812086A (en) * | 2014-02-28 | 2014-05-21 | 中国能源建设集团广东省电力设计研究院 | High voltage electromotor protection system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |