CN203883464U - Controllable small-resistor arc-extinguishing device - Google Patents
Controllable small-resistor arc-extinguishing device Download PDFInfo
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- CN203883464U CN203883464U CN201320733062.4U CN201320733062U CN203883464U CN 203883464 U CN203883464 U CN 203883464U CN 201320733062 U CN201320733062 U CN 201320733062U CN 203883464 U CN203883464 U CN 203883464U
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Abstract
The utility model discloses a controllable small-resistor arc-extinguishing device, and the device is used for arc extinguishing and overvoltage inhibition protection of a power distribution network. The device comprises a grounding transformer, a controllable electric reactor, a vacuum circuit breaker, a controllable small resistor, and an intelligent controller. The grounding transformer forms a neutral point of the power distribution network. The controllable electric reactor and the vacuum circuit breaker are respectively connected to the neutral point of the power distribution network. The controllable small resistor is connected with the vacuum circuit breaker. The intelligent controller is connected with the power distribution network, the controllable electric reactor, the vacuum circuit breaker and the controllable small resistor, so as to respectively control the power distribution network, the controllable electric reactor, the vacuum circuit breaker and the controllable small resistor. The utility model also discloses a controllable-type small-resistor arc-extinguishing method. The device provided by the utility model combines a mode of neutral-point small-resistor grounding with a mode of neutral-point arc extinguishing, so as to process a single-phase grounding fault of the power distribution network, thereby targetedly solving problems of an instantaneous ground fault and a permanent earth fault.
Description
Technical field
The utility model relates to distribution protection field, relates in particular to a kind of controllable type small resistor arc-extinction device.
Background technology
Power distribution network short circuit has four kinds of short-circuit conditions, and the most serious one is three-phase shortcircuit, and wherein single-line to ground fault is modal short trouble in three-phase shortcircuit, and in short trouble, occupying ratio is 70%.The reason that single-line to ground fault occurs has a lot, and for example, object hangs on a wire, and object is long and be suspended to again as on other conductors of the earth.Therefore be, mainly the processing to single-line to ground fault for the processing of power distribution network short circuit.Wherein, the selection of the neutral grounding mode of power distribution network has determined the difference of the processing mode of single-line to ground fault.
In prior art, the earth-free mode of system neutral, is only only applicable to the power distribution network that system capacitive current is very little, and in the time of system generation single phase ground fault, earthing capacitance current flows through in fault point.But in the time that distribution network system earthing capacitance current is larger, the electric arc forming in fault point often can not be from horizontal blanking, the overvoltage that simultaneously intermittent electric arc produces often makes fault spread, brings very large harm to distribution network system.At this moment, need to adopt neutral grounding mode to carry out single-phase grounding fault processing, at present, processing method, because of the difference of system neutral earthing mode, has following several modes: 1, common arc-extinguishing harmonic-eliminating cabinet, adopts vacuum contactor action, change ground connection arc grounding into metallic earthing, its shortcoming is that operate time is slow, larger to motor line harm especially; 2, distribution network system Neutral Point Through Low Resistance mode, in the time of system generation single phase ground fault, earth fault flows through larger electric current, rely on quick relaying protection and the switching device can moment tripping faulty line, its shortcoming is instantaneity ground connection and permanent earth fault without differentiation, trip-out rate is high, and earth fault current is large in addition, and system shock is large; 3, distribution network system neutral point connects grounding through arc mode, in the time of system generation single phase ground fault, in earth fault, the inductive current of arc suppression coil compensates mutually with earthing capacitance current, earth current is reduced, ground arc moment is from horizontal blanking, to permanent earth fault, system can operate with failure 2 hours, so that looking up the fault, its shortcoming is, because faulty line zero-sequence current amplitude is little, isolation ground path difficulty, searches ground path difficulty larger, in addition, be unfavorable for distribution network system increase-volume.
Therefore, need a kind of fault solving device and method of instantaneity single-line to ground fault and the permanent single-line to ground fault that can take into account power distribution network, ensure the safe operation of distribution network system multi-facetedly.
Utility model content
Single and cannot carry out the problem of safety guarantee to distribution network system for the handling object of existing single-phase grounding fault solving device and method comprehensively, the utility model provides a kind of controllable type small resistor arc-extinction device, adopt grounding transformer to manufacture the neutral point of power distribution network, realize the instantaneity single-phase grounding fault processing to distribution network system by controlled reactor, by the compounding practice of Fast Speed Vacuum Circuit Breaker and controlled small resistor, realize the permanent single-phase grounding fault processing to distribution network system, using intelligent controller to carry out intellectuality to each equipment controls, effectively safeguard the normal operation of distribution network system.
To achieve these goals, the utility model provides a kind of controllable type small resistor arc-extinction device, for power distribution network extinguishing arc and Overvoltage suppressing are protected, described device comprises, grounding transformer, connects power distribution network, adopts Z-shaped wiring construction, for the manufacture of the neutral point of power distribution network, and with the secondary capacity that substitutes station transformer; Controlled reactor, for high short-circuit impedance transformer, a winding of high short-circuit impedance transformer connects the neutral point of power distribution network, high short-circuit impedance transformer has two secondary winding, described two secondary winding are connected with one end of extinguishing arc control cubicle, in extinguishing arc control cubicle, be equipped with high-power silicon controlled rectifier and corresponding filter, the other end ground connection of extinguishing arc control cubicle; Vacuum circuit-breaker, adopts electromagnetic push structure, and full-digital circuit control, realizes vacuum circuit breaker, and one end connects the neutral point of power distribution network, and the other end connects controlled small resistor; Controlled small resistor, adopts stainless steel alloy material, is used in conjunction with vacuum circuit-breaker, and one end connects vacuum circuit-breaker, other end ground connection; Intelligent controller, is arranged on the breaker cabinet of placing vacuum circuit-breaker, is connected with power distribution network, controlled reactor, vacuum circuit-breaker and controlled small resistor that respectively power distribution network, controlled reactor, vacuum circuit-breaker and controlled small resistor are controlled respectively; Wherein, intelligent controller is in the time of power distribution network generation earth fault, electric network capacitance and current value to power distribution network is measured, calculate the inductive current that needs compensation according to the electric network capacitance and current value measuring, to control controlled reactor output offset current, when intelligent controller was determined after the scheduled time of controlled reactor output offset current, when the earth fault of power distribution network still exists, to the power distribution network processing that has a power failure.
Alternatively, described intelligent controller has a power failure to process to power distribution network and comprises, the automatic closed vacuum circuit-breaker of intelligent controller, to drop into controlled small resistor, makes protection for feed line action, by switch trip isolated fault circuit, and control controlled reactor and automatically exit compensation; After faulty line isolation, control distribution network restoration and normally move, disconnect vacuum circuit-breaker to exit controlled small resistor.
In this patent, intelligent controller for power distribution network have a power failure process operating principle be the general operation principle of this area intelligent controller, its control for vacuum circuit-breaker, controlled reactor, power distribution network etc. is also the basic controlling of this area, does not relate to improvement and the innovation of software.
Alternatively, the described scheduled time is 10 seconds.
Alternatively, the closing speed of controlled small resistor is 7 milliseconds, and opening velocity is 3.5 milliseconds.
The utility model is owing to having adopted technique scheme, thereby have the following advantages: controllable type small resistor arc-extinction device of the present utility model, transform the single-line to ground fault settling mode of in prior art, distribution network system being implemented substance protection, by connecting the controlled reactor of neutral point of distribution network system, solved respectively the fault of instantaneity single-line to ground fault and permanent single-line to ground fault by connecting the vacuum circuit-breaker of neutral point of distribution network system and controlled small resistor, improve existing fault and solved pattern, improve the reliability of distribution network system.
Brief description of the drawings
Fig. 1 is the structural representation of a kind of controllable type small resistor of the utility model arc-extinction device;
Fig. 2 is the method flow diagram of a kind of controllable type small resistor of the utility model arc extinguishing method.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.
First, please refer to Fig. 1, Fig. 1 is the structural representation of a kind of controllable type small resistor of the utility model arc-extinction device 1, described controllable type small resistor arc-extinction device 1 is for protecting power distribution network extinguishing arc and Overvoltage suppressing, and described controllable type small resistor arc-extinction device 1 comprises, grounding transformer 11, connect power distribution network, adopt Z-shaped wiring construction, for the manufacture of the neutral point of power distribution network, and with the secondary capacity that substitutes station transformer; Controlled reactor 12, for high short-circuit impedance transformer, the neutral point that a winding of high short-circuit impedance transformer connects power distribution network is grounding transformer 11, high short-circuit impedance transformer has two secondary winding, described two secondary winding are connected with one end of extinguishing arc control cubicle, in extinguishing arc control cubicle, be equipped with high-power silicon controlled rectifier and corresponding filter, the other end ground connection of extinguishing arc control cubicle; Vacuum circuit-breaker 13, adopts electromagnetic push structure, and full-digital circuit control, realizes vacuum circuit breaker, and the neutral point that one end connects power distribution network is grounding transformer 11, and the other end connects controlled small resistor 14; Controlled small resistor 14, adopts stainless steel alloy material, is used in conjunction with vacuum circuit-breaker 13, and one end connects vacuum circuit-breaker 13, other end ground connection; Intelligent controller 15, be arranged on the breaker cabinet of placing vacuum circuit-breaker 13, be connected with power distribution network, controlled reactor 12, vacuum circuit-breaker 13 and controlled small resistor 14 that respectively power distribution network, controlled reactor 12, vacuum circuit-breaker 13 and controlled small resistor 14 are controlled respectively; Wherein, intelligent controller 15 is in the time of power distribution network generation earth fault, electric network capacitance and current value to power distribution network is measured, calculate the inductive current that needs compensation according to the electric network capacitance and current value measuring, export offset current to control controlled reactor 12, determine at controlled reactor 12 and export after the scheduled time of offset current when intelligent controller 15, when the earth fault of power distribution network still exists, to the power distribution network processing that has a power failure.Wherein, described intelligent controller 15 has a power failure to process to power distribution network and comprises, the automatic closed vacuum circuit-breaker 13 of intelligent controller 15, to drop into controlled small resistor 14, makes protection for feed line action, by switch trip isolated fault circuit, and control controlled reactor 12 and automatically exit compensation; After faulty line isolation, control distribution network restoration and normally move, disconnect vacuum circuit-breaker 13 to exit controlled small resistor 14.Wherein, the described scheduled time is chosen as 10 seconds, and the closing speed of controlled small resistor 14 is chosen as 7 milliseconds, and opening velocity is chosen as 3.5 milliseconds.
In addition, the resistance of controlled small resistor 14 is selected the main requirement of considering to limit electric multiple, zero-sequenceprotection sensitivity, to the factor such as interference and Electrical Safety of communication line, and select according to the concrete condition of various places distribution with suiting measures to local conditions, for example, can be by single phase ground fault time, the requirement of over-voltage multiple be selected, first calculate or actual measurement system (on every section of bus) capacitance current, consider certain development nargin, thereby the unbalanced earth fault capacitance current value IC(IC that determines system is three-phase ground capacitance current value sum), then during according to desired single-phase earthing, over-voltage multiple is determined the current value by neutral resistor, last according to the resistance of determining earth resistance by the current value of neutral resistor.
In addition, power distribution network is made up of overhead transmission line, cable, shaft tower, distribution transformer, isolating switch, reactive compensation capacitor and some affiliated facilities etc., plays the network of important distribution electric energy effect in power network.Power distribution network is classified by electric pressure, can be divided into high voltage distribution network (35-110KV), medium voltage distribution network (6-10KV, Suzhou has 20KV's), low-voltage network (220/380V); In the larger megapolis of load factor, 220KV electrical network also has distributing function.Can also classify by the function of service area, can be divided into urban power distribution network, Rural Power Distribution Network and factory's power distribution network etc.In urban distribution network system, major network refers to the electrical network of 110KV and above thereof, mainly plays join domain high pressure (220KV and more than) electrical network.
Then, with reference to Fig. 2, continue the utility model to describe, Fig. 2 is the method flow diagram of the utility model to controllable type small resistor arc extinguishing method, and described method comprises the following steps:
Step 201: adopt the grounding transformer of Z-shaped wiring construction to connect power distribution network to manufacture the neutral point of power distribution network, grounding transformer is also with the secondary capacity that substitutes station transformer;
Step 202: adopt a winding of the controlled reactor of high short-circuit impedance transformer to connect the neutral point of power distribution network, two secondary winding are connected with one end of extinguishing arc control cubicle;
Step 203: one end of vacuum circuit-breaker connects the neutral point of power distribution network, and the other end of vacuum circuit-breaker connects controlled small resistor, the other end ground connection of controlled small resistor;
Step 204: intelligent controller is arranged on the breaker cabinet of placing vacuum circuit-breaker, and intelligent controller is connected with power distribution network, controlled reactor, vacuum circuit-breaker and controlled small resistor that respectively power distribution network, controlled reactor, vacuum circuit-breaker and controlled small resistor are controlled respectively;
Step 205: intelligent controller, in the time of power distribution network generation earth fault, is measured the electric network capacitance and current value of power distribution network;
Step 206: intelligent controller calculates the inductive current that needs compensation according to the electric network capacitance and current value measuring, to control controlled reactor output offset current;
Step 207: when intelligent controller was determined after the scheduled time of controlled reactor output offset current, when the earth fault of power distribution network still exists, to the power distribution network processing that has a power failure;
Wherein, in extinguishing arc control cubicle, be equipped with high-power silicon controlled rectifier and corresponding filter, the other end ground connection of extinguishing arc control cubicle, vacuum circuit-breaker adopts electromagnetic push structure, full-digital circuit control, realize vacuum circuit breaker, controlled small resistor adopts stainless steel alloy material, is used in conjunction with vacuum circuit-breaker;
Wherein, described intelligent controller has a power failure to process to power distribution network and comprises, the automatic closed vacuum circuit-breaker of intelligent controller, to drop into controlled small resistor, makes protection for feed line action, by switch trip isolated fault circuit, and control controlled reactor and automatically exit compensation; When after faulty line isolation, control distribution network restoration and normally move, disconnect vacuum circuit-breaker to exit controlled small resistor.
Those skilled in the art will recognize that; above-mentioned embodiment is exemplary; in order to make those skilled in the art can better understand this patent content; should not be understood as the restriction to this patent protection range; change or modify as long as disclose spiritual any being equal to of doing according to this patent, all fall into this patent protection range.
Claims (4)
1. a controllable type small resistor arc-extinction device, for to power distribution network extinguishing arc and Overvoltage suppressing protection, is characterized in that, described device comprises:
Grounding transformer, connects power distribution network, adopts Z-shaped wiring construction, for the manufacture of the neutral point of power distribution network, and with the secondary capacity that substitutes station transformer;
Controlled reactor, for high short-circuit impedance transformer, a winding of high short-circuit impedance transformer connects the neutral point of power distribution network, high short-circuit impedance transformer has two secondary winding, described two secondary winding are connected with one end of extinguishing arc control cubicle, in extinguishing arc control cubicle, be equipped with high-power silicon controlled rectifier and corresponding filter, the other end ground connection of extinguishing arc control cubicle;
Vacuum circuit-breaker, adopts electromagnetic push structure, and full-digital circuit control, realizes vacuum circuit breaker, and one end connects the neutral point of power distribution network, and the other end connects controlled small resistor;
Controlled small resistor, adopts stainless steel alloy material, is used in conjunction with vacuum circuit-breaker, and one end connects vacuum circuit-breaker, other end ground connection;
Intelligent controller, is arranged on the breaker cabinet of placing vacuum circuit-breaker, is connected with power distribution network, controlled reactor, vacuum circuit-breaker and controlled small resistor that respectively power distribution network, controlled reactor, vacuum circuit-breaker and controlled small resistor are controlled respectively;
Wherein, intelligent controller is in the time of power distribution network generation earth fault, electric network capacitance and current value to power distribution network is measured, calculate the inductive current that needs compensation according to the electric network capacitance and current value measuring, to control controlled reactor output offset current, when intelligent controller was determined after the scheduled time of controlled reactor output offset current, when the earth fault of power distribution network still exists, to the power distribution network processing that has a power failure.
2. controllable type small resistor arc-extinction device according to claim 1, is characterized in that, described intelligent controller has a power failure to process to power distribution network and comprises:
The automatic closed vacuum circuit-breaker of intelligent controller, to drop into controlled small resistor, makes protection for feed line action, by switch trip isolated fault circuit, and controls controlled reactor and automatically exits compensation;
After faulty line isolation, control distribution network restoration and normally move, disconnect vacuum circuit-breaker to exit controlled small resistor.
3. controllable type small resistor arc-extinction device according to claim 1, is characterized in that:
The described scheduled time is 10 seconds.
4. according to the arbitrary described controllable type small resistor arc-extinction device of claim 1-3, it is characterized in that:
The closing speed of controlled small resistor is 7 milliseconds, and opening velocity is 3.5 milliseconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320733062.4U CN203883464U (en) | 2013-11-19 | 2013-11-19 | Controllable small-resistor arc-extinguishing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320733062.4U CN203883464U (en) | 2013-11-19 | 2013-11-19 | Controllable small-resistor arc-extinguishing device |
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| CN203883464U true CN203883464U (en) | 2014-10-15 |
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| CN201320733062.4U Expired - Fee Related CN203883464U (en) | 2013-11-19 | 2013-11-19 | Controllable small-resistor arc-extinguishing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560501A (en) * | 2013-11-19 | 2014-02-05 | 上海翱辰电气科技有限公司 | Controlled type small-resistor arc extinction device and method |
| CN111525485A (en) * | 2020-05-08 | 2020-08-11 | 广东电网有限责任公司 | Online ice-melt device of distribution network |
-
2013
- 2013-11-19 CN CN201320733062.4U patent/CN203883464U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560501A (en) * | 2013-11-19 | 2014-02-05 | 上海翱辰电气科技有限公司 | Controlled type small-resistor arc extinction device and method |
| CN111525485A (en) * | 2020-05-08 | 2020-08-11 | 广东电网有限责任公司 | Online ice-melt device of distribution network |
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| 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: 20141015 Termination date: 20171119 |
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| CF01 | Termination of patent right due to non-payment of annual fee |