CN106711987A - Quick arc extinguishing system and method for single-phase ground fault of low-current ground system - Google Patents

Quick arc extinguishing system and method for single-phase ground fault of low-current ground system Download PDF

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Publication number
CN106711987A
CN106711987A CN201710172594.8A CN201710172594A CN106711987A CN 106711987 A CN106711987 A CN 106711987A CN 201710172594 A CN201710172594 A CN 201710172594A CN 106711987 A CN106711987 A CN 106711987A
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phase
voltage
earth fault
thyristor groups
ground
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CN201710172594.8A
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CN106711987B (en
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薛峰
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Nanjing Fortune Electric Automation Co Ltd
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Nanjing Fortune Electric Automation Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/08Limitation or suppression of earth fault currents, e.g. Petersen coil

Abstract

The invention discloses a quick arc extinguishing system and method for a single-phase ground fault of a low-current ground system. The quick arc extinguishing system comprises a ground line selection device, an inverse parallel thyristor group and a thyristor driving device. The ground line selection device adopts bus three-phase voltage and zero-sequence voltage, judges whether a ground fault exists according to the zero-sequence voltage and judges the ground phase according to the voltage drop phase in the three-phase voltage after single-phase grounding happens, and then the thyristor group driving device triggers the inverse parallel thyristor group to be turned on, the fault phase is directly grounded, and the voltage between the fault phase and the ground is pulled down, so that the accidents of arcing over voltage, cable burnout, personal casualty and the like in the continuous operation process after grounding are prevented.

Description

A kind of singlephase earth fault fast arc extinction system and method for small current neutral grounding system
Technical field
The present invention relates to the relay protection field of power system, in particular it relates to a kind of small current neutral grounding system is single-phase connect The system and method for earth fault fast arc extinction.
Background technology
In 3kV-66kV small current neutral grounding systems (also known as system with non effectively earth ed neutral), single-phase earthing is more normal The fault type seen.When there is single-phase earthing in small current neutral grounding system, the reduction of failure phase-to-ground voltage, non-faulting phase-to-ground voltage Raise, line voltage remains unchanged symmetrically, under this state, because of earth current very little, in order to ensure power supply reliability, can allow to run 1- 2h.But due to non-faulting phase arc overvoltage, easily cause insulation vulnerable area puncture, iron core of voltage transformer saturation, system Overvoltage, and failure phase arc light is the problems such as burn cable, easily trigger personal electric shock casualty accident, therefore be followed by single-phase earthing Ground line selection apparatus also need to the singlephase earth fault of timely isolated fault phase, and safeguards system safe and stable operation and power supply are reliable Property.
It is critical only that for single-phase grounded malfunction in grounded system of low current fast arc extinction select exactly failure phase, and by failure Phase rapid grounding.
The content of the invention
Goal of the invention:For above-mentioned prior art, there is provided a kind of single-phase grounded malfunction in grounded system of low current fast arc extinction System and method, because non-faulting phase arc light is excessively electric during solving to be continued to run with during current single-phase earthing of small current earthing system Pressure causes accident problem.
Technical scheme:A kind of singlephase earth fault fast arc extinction system of small current neutral grounding system, including:
Line-selected earthing device, for real-time judge earth fault phase, the phase that is concurrently out of order arc extinguishing control signal;
The thyristor groups of parallel connected in reverse phase, the thyristor groups of the parallel connected in reverse phase are connected between bus and ground by switch;
Thyristor driver device, the failure phase arc extinguishing control signal for being sent according to the line-selected earthing device controls institute State the thyristor groups conducting of the corresponding parallel connected in reverse phase of earth fault.
Further, the line-selected earthing device includes the voltage transformer on bus, and the voltage transformer is used to adopt Collection bus three-phase voltage and residual voltage.
Further, carried out using hardwire mode between the line-selected earthing device and the thyristor groups drive device Communication, or communicated by the way of wired or wireless.
Further, it is described switch be arranged between the bus and the thyristor groups of parallel connected in reverse phase, or it is described it is anti-phase simultaneously The thyristor groups of connection are arranged between the bus and switch.
A kind of singlephase earth fault fast arc extinction method of small current neutral grounding system, comprises the following steps:Real-time judge system System residual voltage, when there is earth fault, system produces residual voltage, and faulted phase voltage reduction, and non-faulting phase voltage is raised; After judging earth fault phase, send the order of triggering failure phase thyristor groups conducting, two IGCTs in thyristor groups by In the turn on thyristors in one and only one direction after reverse parallel connection, triggering, the IGCT of conducting is closed automatically in voltage reversal It is disconnected, the fast conducting characteristic according to thyristor groups, by failure phase busbar grounding, failure phase-to-ground voltage is rapid close to 0, and arc light puts out Go out.
Beneficial effect:(1) ground connection event is judged whether by the way of residual voltage is combined using bus three-phase voltage Hinder and select failure phase, reliability is high, self-produced zero sequence and open delta occur residual voltage when single-phase wire break of PT, When a phase voltage is reduced, broken string can be judged whether by judging other two-phase voltage rising.As other two-phase voltage does not have Change can determine whether once to break for PT, prevent malfunction;
(2) using the artificial thinking in point of incoming cables rapid build metallic earthing point, faulted phase voltage is dragged down and ground one Cause, can quickly make earth fault arc extinguishing, it is to avoid the arc overvoltage of non-faulting phase, ground connection place's cable are burnt and personal by arc light Electric shock casualty accident, system may not necessarily immediately trip and continue safe operation for a period of time after making generation singlephase earth fault, Greatly improve the reliability and security of system;
(3) by the way of auxiliary switch and reverse parallel connection thyristor groups coordinate, can control the arc light time of single-phase earthing Within half cycle, it is to avoid the slow-footed problem of switch control, position is being closed when auxiliary switch normally runs always.
Brief description of the drawings
Fig. 1 is the singlephase earth fault fast arc extinction system structure diagram of small current neutral grounding system.
Specific embodiment
The singlephase earth fault fast arc extinction system of small current neutral grounding system of the invention, the object that it is directed to is 3kV- 66kV small current neutral grounding systems.As shown in figure 1, using a line-selected earthing device 1, in bus PT cabinets, by cable Complete to send bus three-phase voltage and residual voltage collection, the order to thyristor groups drive device;Thyristor groups drive dress Put same line-selected earthing device to be installed in bus PT cabinets, for receiving order, the transmission driving pulse that line-selected earthing device is issued To the thyristor groups of reverse parallel connection;Bus three-phase voltage and residual voltage are accessed from bus-bar potential transformer 2 by cable and are grounded Line selection apparatus;Hardwire mode is used between line-selected earthing device and thyristor groups drive device, or using wired or wireless Communication modes transmission information;The thyristor groups 3 of parallel connected in reverse phase are connected between bus and ground by switch 4, and switch is arranged on Between bus and the thyristor groups of parallel connected in reverse phase, or the thyristor groups of parallel connected in reverse phase are arranged between bus and switch;IGCT Group drive device 5 is connected with reverse parallel connection thyristor groups 3 by the way of cable or optical fiber, using electric pulse or the side of light pulse Formula transmission information;Line-selected earthing device 1 judges that earth fault exists and selects according to the bus three-phase voltage and residual voltage of collection Go out Earth Phase.
Line-selected earthing device gathers bus-bar potential transformer three-phase voltage and residual voltage, is judged whether according to residual voltage There is earth fault, after there is single-phase earthing, Earth Phase is judged according to which phase voltage reduction in three-phase voltage, by connecing firmly The mode of line, or communication modes wirelessly, wired, will determine that the thyristor groups drive device of result input fault phase, by crystalline substance The triggering reverse parallel connection thyristor groups conducting of brake tube group drive device;Two IGCTs in thyristor groups are touched due to reverse parallel connection The turn on thyristors in one and only one direction after hair, the IGCT of conducting automatically shuts down in voltage reversal, according to IGCT The fast conducting characteristic of group, failure phase-to-ground voltage is rapid close to 0, will failure be mutually directly grounded, drag down failure phase and ground Voltage, arc overvoltage, cable burn and the accident such as personal injury during preventing from continuing to run with after ground connection.This method was both directed to Cable run is also adapted for overhead transmission line, small current neutral grounding system occur singlephase earth fault when, it is not necessary to immediately tripping operation and after Continuous safe operation for a period of time, increased the reliable rows and security of system power supply.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (5)

1. the singlephase earth fault fast arc extinction system of a kind of small current neutral grounding system, it is characterised in that including:
Line-selected earthing device, for real-time judge earth fault phase, the phase that is concurrently out of order arc extinguishing control signal;
The thyristor groups of parallel connected in reverse phase, the thyristor groups of the parallel connected in reverse phase are connected between bus and ground by switch;
Thyristor driver device, for sent according to the line-selected earthing device failure phase arc extinguishing control signal control described in connect The thyristor groups conducting of the corresponding parallel connected in reverse phase of earth fault.
2. a kind of singlephase earth fault fast arc extinction system of small current neutral grounding system according to claim 1, its feature It is that the line-selected earthing device includes the voltage transformer on bus, the voltage transformer is used to gather bus three-phase electricity Pressure and residual voltage.
3. a kind of singlephase earth fault fast arc extinction system of small current neutral grounding system according to claim 1, its feature It is to be communicated using hardwire mode between the line-selected earthing device and the thyristor groups drive device, or uses Wired or wireless mode is communicated.
4. a kind of singlephase earth fault fast arc extinction system of small current neutral grounding system according to claim 1, its feature Be that the switch is arranged between the bus and the thyristor groups of parallel connected in reverse phase, or the parallel connected in reverse phase thyristor groups It is arranged between the bus and switch.
5. a kind of singlephase earth fault fast arc extinction method of small current neutral grounding system, it is characterised in that comprise the following steps:It is real When judge system residual voltage, when there is earth fault, system produces residual voltage, and faulted phase voltage reduction, non-faulting phase Voltage is raised;After judging earth fault phase, the order of triggering failure phase thyristor groups conducting, two in thyristor groups are sent IGCT due to reverse parallel connection, the turn on thyristors in one and only one direction after triggering, the IGCT of conducting is in voltage reversal When automatically shut down, the fast conducting characteristic according to thyristor groups, by failure phase busbar grounding, failure phase-to-ground voltage is approached rapidly 0, arc light extinguishes.
CN201710172594.8A 2017-03-21 2017-03-21 A kind of singlephase earth fault fast arc extinction system and method for small current neutral grounding system Active CN106711987B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108169623A (en) * 2017-12-21 2018-06-15 国网宁夏电力公司中卫供电公司 The method that single-phase earth fault current traveling wave in 10kv outlets is measured in electric substation
CN111308398A (en) * 2020-03-31 2020-06-19 深圳供电局有限公司 Method and device for judging polarity of zero sequence current transformer in transformer substation

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CN103474982A (en) * 2013-09-29 2013-12-25 安徽一天电气技术有限公司 Arc extinction device for eliminating interphase short circuit in single-resistance method
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
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CN104868461A (en) * 2015-06-01 2015-08-26 安徽禄讯电子科技有限公司 Intelligent switch arc-extinguishing and overvoltage-protecting device
CN206542190U (en) * 2017-03-21 2017-10-03 南京福致通电气自动化有限公司 A kind of singlephase earth fault fast arc extinction system of small current neutral grounding system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201766351U (en) * 2010-05-28 2011-03-16 吴昌德 Device for selecting faulty line and eliminating faulty electric arc during single-phase ground fault of low-current grounding system
CN103474982A (en) * 2013-09-29 2013-12-25 安徽一天电气技术有限公司 Arc extinction device for eliminating interphase short circuit in single-resistance method
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
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108169623A (en) * 2017-12-21 2018-06-15 国网宁夏电力公司中卫供电公司 The method that single-phase earth fault current traveling wave in 10kv outlets is measured in electric substation
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CN111308398A (en) * 2020-03-31 2020-06-19 深圳供电局有限公司 Method and device for judging polarity of zero sequence current transformer in transformer substation

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