CN201498986U - Isolating arc extinguishing cabinet - Google Patents
Isolating arc extinguishing cabinet Download PDFInfo
- Publication number
- CN201498986U CN201498986U CN2009201877960U CN200920187796U CN201498986U CN 201498986 U CN201498986 U CN 201498986U CN 2009201877960 U CN2009201877960 U CN 2009201877960U CN 200920187796 U CN200920187796 U CN 200920187796U CN 201498986 U CN201498986 U CN 201498986U
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- arc
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Abstract
Disclosed is an isolating arc extinguishing cabinet which belongs to the technical field of a low-current system of electric power transmission and distribution and aims to solve the technical problem that a fault-phase current limiting fuse inside an arc extinguishing cabinet of the system is fused when arc grounding is converted into metallic grounding outside the system. The isolating arc extinguishing cabinet is mainly characterized by comprising a current controller; one end of the current controller is respectively connected with single-phase vacuum contactors; the other end of the current controller is connected with a zero-sequence current transformer additionally arranged inside each incoming-outgoing line switch cabinet; one end of a voltage controller is respectively connected with the single-phase vacuum contactors; the other end of the voltage controller is connected with a voltage transformer; and a novel arc alarm and direct metallic grounding control loop is formed by the current controller and the voltage controller. The isolating arc extinguishing cabinet not only can accurately judge whether the arc grounding occurs and which phase the arc grounding occurs to, but also can accurately judge the arc grounding occurs inside the system or outside the system, thereby preventing the arc grounding occurring outside the system from affecting the system.
Description
Affiliated technical field
The utility model relates to arc extinguishing technical field in the power transmission and distribution small current system, is specially the isolated form arc extinguishing cabinet of 6kV, 10kV and 35kV medium-pressure electricity supply system.
Background technology
In China, 6kV, 10kV and 35kV medium-pressure electricity supply system belong to not solidly grounded system of neutral point mostly, be also referred to as small current neutral grounding system, in such system, if Single Phase Metal ground connection is taken place, though sound current potential relatively rises to the line magnitude of voltage of system, according to the electric industry operating standard, the insulating part of system should be able to bear, and rules allow system's this disease of band (referring to take place Single Phase Metal ground connection) operation two hours.If phylogenetic is single-phase arc grounding, batch (-type) arc grounding particularly, at this moment, sound current potential relatively will rise to the twice line magnitude of voltage of system, and promptly 3.5 of primary voltage times, in addition higher, it has exceeded the insulation tolerance range of system insulation spare, may cause and a certainly formerly soundly local arc grounding take place, thereby cause, make system's tripping operation outage at last because of out-phase strange land arc grounding generation line to line fault at another.
Eliminating the superpotential best method of arc grounding both at home and abroad at present is directly arc grounding to be converted to metal ground connection at short notice; be about to fault and in device, realize ground connection on the spot by closed fault phase vacuum contactor; its advantage is; the ground connection arc light has disappeared; the above earth potential that perfects phase is limited in the line magnitude of voltage of system; according to the electric industry operating standard; system can continue to move two hours; the site operation personnel can gain time and look into fault; or other operational mode of schedule system; that this device is is at present commonly used on the market (hereinafter to be referred as) the arc extinguishing cabinet, the extinguishing arc of being called and overvoltage protection are also arranged.Its shortcoming is, can not judge the position that arc grounding takes place, and is in the system of this electric substation, still outside the system of this electric substation.When the electric substation at the arc extinguishing cabinet place of routine is that the several subordinaties of upper level electric substation open and close in the middle of the station one, the position that arc grounding takes place is the system of electric substation that opens and closes standing posture at other, at this moment, the arc extinguishing cabinet has moved, fault ground connection on the spot in cabinet, because system is big, arc grounding once more will take place in the appliance component that can not bear system line magnitude of voltage size outside the system of this electric substation, thereby, the line to line fault by arc extinguishing cabinet body fault phase vacuum contactor occurs, the current limiting fuse of arc extinguishing cabinet internal fault phase is fused.This shows that accident is not to take place in the system at arc extinguishing cabinet place, but want the owner of arc extinguishing cabinet place system to spend money on new current limiting fuse replacing, this is obviously unreasonable
Summary of the invention
The utility model isolated form arc extinguishing cabinet technical problem to be solved is: will change into by voltage controller and two controls simultaneously of current controller by original single by the voltage controller control single-phase vacuum contactor that picks up from the PT secondary singal; With following a plurality of tens electric substations even of band of a transformer, consider they are separated from the arc extinguishing function aspects, with the power transformation unit of doing, arc extinguishing separately.If arc grounding has taken place in big system somewhere, the isolated form arc extinguishing cabinet action of arc grounding spot place electric substation, realize in the cabinet direct metal ground connection arc extinguishing on the spot, and the isolated form arc extinguishing cabinet warning junction closure in other electric substation, alarm signal only is provided, vacuum contactor all still is in off-state, is failure to actuate.
Technical solution adopted in the utility model is: isolated form arc extinguishing cabinet is designed to whole cabinet type structure, comprises isolating switch, high-voltage and current-limitation fuse, the single-phase type vacuum contactor, voltage controller, the special-purpose fuse of voltage transformer, the voltage transformer that has auxiliary secondary coil, current controller.Current controller one end is connected with the single-phase type vacuum contactor respectively, the other end is connected with the zero sequence current mutual inductor of setting up in each turnover wiretap cabinet, voltage controller one end is connected with the single-phase type vacuum contactor respectively, the other end is connected with voltage transformer, and current controller and voltage controller are formed arc light of the present invention and reported to the police and direct metal ground connection control loop.
The beneficial effects of the utility model are: by changing the control loop of single-phase vacuum contactor, control the single-phase vacuum contactor simultaneously by voltage controller and two of current controllers, not only arc grounding can be judged whether accurately to take place and which phase arc grounding occurs in, but also can judge accurately that arc grounding occurs in the system of this electric substation or outside the system, thereby avoided the influence of arc grounding to native system takes place outside the system, caused the current limiting fuse of arc extinguishing cabinet internal fault phase to be fused.
Description of drawings
Fig. 1 is the utility model isolated form arc extinguishing cabinet schematic diagram.
1 is the service entrance switch cabinet, and 2 for feeding out switch cubicle, and 3 for feeding out switch cubicle, 4 for feeding out switch cubicle, 5 is isolated form arc extinguishing cabinet, and L is a zero sequence current mutual inductor, and G is an isolating switch, 1RD is a high-voltage and current-limitation fuse, J is the single-phase type vacuum contactor, and YK is a voltage controller, and 2RD is the special-purpose fuse of voltage transformer, PT is the voltage transformer that has auxiliary secondary coil, and LK is a current controller.
Embodiment
As shown in Figure 1, the utility model isolated form arc extinguishing cabinet comprises isolating switch G for whole cabinet type structure, high-voltage and current-limitation fuse 1RD, single-phase type vacuum contactor J, voltage controller YK, the special-purpose fuse 2RD of voltage transformer has the voltage transformer pt of assisting secondary coil, current controller LK.Current controller LK one end is connected with single-phase type vacuum contactor J respectively, and the other end is connected with the zero sequence current mutual inductor L that sets up in each turnover wiretap cabinet; Voltage controller YK one end is connected with single-phase type vacuum contactor J respectively, and the other end is connected with voltage transformer pt; Current controller LK and voltage controller YK form the utility model arc light and report to the police and direct metal ground connection control loop.
The utility model isolated form arc extinguishing cabinet considers from the arc extinguishing function aspects, with a transformer down a plurality of tens electric substations even of band separate, with the power transformation unit of doing, arc extinguishing separately.The innovation part is to become on the spot with arc grounding takes place that the control loop of the single-phase vacuum contactor J of direct metal ground connection has changed, control single-phase vacuum contactor J by original single by the voltage controller YK that picks up from the voltage transformer pt secondary singal, change into by voltage controller YK and two controls simultaneously of current controller LK, voltage controller YK signal picks up from each phase voltage and the residual voltage of voltage transformer pt secondary, be responsible for judging whether to take place arc grounding, and which phase definite arc grounding occurs in, current controller LK signal picks up from each phase current of secondary and the zero-sequence current that respectively passes in and out the line zero sequence current mutual inductor, judge whether to take place arc grounding once more from current angle, thereby can determine whether arc grounding occurs in the system of this electric substation still outside the system, for this reason, the utility model also requires to set up zero sequence current mutual inductor L in this electric substation respectively passes in and out the wiretap cabinet.
Arc grounding takes place in load place that feeds out switch cubicle 3 in system in this electric substation such as Fig. 1, voltage controller YK in the isolated form arc extinguishing cabinet cabinet is thereupon according to picking up from the voltage transformer pt secondary singal, after computing is judged, J sends close command to fault phase vacuum contactor, current controller LK is according to the secondary singal of picking up from turnover loop zero sequence current mutual inductor L simultaneously, also judging whether current arc grounding occurs in the native system, if, current controller LK just sends close command to vacuum contactor J, at this moment, the vacuum contactor closure of fault phase, the system that finishes changes metallic earthing on the spot into by arc grounding, the ground connection arc light extinguishes, and non-fault relatively current potential is pinned in system's rated line voltage value.
If the ground connection arc light occurs in outside the system of this electric substation, although then the voltage controller YK in the isolated form arc extinguishing cabinet cabinet is according to the secondary singal of voltage transformer pt, also judged is that arc grounding takes place mutually for which, and sent instruction, make the normal opened contact closure of the vacuum contactor J of fault phase, but because of the current controller LK in the isolated form arc extinguishing cabinet cabinet does not capture the zero-sequence current that presents arc grounding, refusal sends close command to vacuum contactor J normal opened contact, so the time fault phase vacuum contactor just can not be closed, but can obtain the arc light alarm signal that the voltage controller YK in this isolated form arc extinguishing cabinet cabinet sends.
Claims (1)
1. isolated form arc extinguishing cabinet, be whole cabinet type structure, comprise isolating switch (G), high-voltage and current-limitation fuse (1RD), single-phase type vacuum contactor (J), voltage controller (YK), the special-purpose fuse (2RD) of voltage transformer, the voltage transformer (PT) that has auxiliary secondary coil, it is characterized by: described isolated form arc extinguishing cabinet also includes current controller (LK), current controller (LK) end is connected with single-phase type vacuum contactor (J) respectively, the other end is connected with the zero sequence current mutual inductor of setting up in each turnover wiretap cabinet (L), voltage controller (YK) end is connected with single-phase type vacuum contactor (J) respectively, and the other end is connected with voltage transformer (PT), and current controller (LK) is formed the utility model arc light with voltage controller (YK) and reported to the police and direct metal ground connection control loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201877960U CN201498986U (en) | 2009-09-27 | 2009-09-27 | Isolating arc extinguishing cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201877960U CN201498986U (en) | 2009-09-27 | 2009-09-27 | Isolating arc extinguishing cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201498986U true CN201498986U (en) | 2010-06-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201877960U Expired - Lifetime CN201498986U (en) | 2009-09-27 | 2009-09-27 | Isolating arc extinguishing cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201498986U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097783A (en) * | 2011-01-21 | 2011-06-15 | 合肥徽力电气技术有限公司 | High-voltage flexible safety device |
-
2009
- 2009-09-27 CN CN2009201877960U patent/CN201498986U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097783A (en) * | 2011-01-21 | 2011-06-15 | 合肥徽力电气技术有限公司 | High-voltage flexible safety device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100602 |
|
| CX01 | Expiry of patent term |