CN202535052U - Neutral point grounding system via combination of reactance and resistor - Google Patents

Neutral point grounding system via combination of reactance and resistor Download PDF

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Publication number
CN202535052U
CN202535052U CN2012201136804U CN201220113680U CN202535052U CN 202535052 U CN202535052 U CN 202535052U CN 2012201136804 U CN2012201136804 U CN 2012201136804U CN 201220113680 U CN201220113680 U CN 201220113680U CN 202535052 U CN202535052 U CN 202535052U
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China
Prior art keywords
neutral point
resistance
control switch
resistor
reactance
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Expired - Fee Related
Application number
CN2012201136804U
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Chinese (zh)
Inventor
姚建歆
顾临峰
徐剑
曹扬
邵峥达
沙征
周鑫
顾晓鸣
章日华
沈道义
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Shanghai Municipal Electric Power Co
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Shanghai Municipal Electric Power Co
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Priority to CN2012201136804U priority Critical patent/CN202535052U/en
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Publication of CN202535052U publication Critical patent/CN202535052U/en
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Abstract

The utility model discloses a neutral point grounding system via a combination of a reactance and a resistor, wherein a neutral point is located in a power distribution network, the grounding system comprises three groups of connected-in-parallel leakage resistors r0 and ground capacitors C0, a reactor L, a voltage limiting resistor Rxy, a line selection resistor Rxx, a control switch K1 and a control switch K2, wherein the three groups of connected-in-parallel leakage resistors r0 and ground capacitors C0 are connected with a three-phase cable and a ground end, the voltage limiting resistor Rxy is serially connected with the branch circuit of the control switch K1 and control the branch circuit of the control switch K1, the line selection resistor Rxx is serially connected with the branch circuit of the control switch K2 and control the branch circuit of the control switch K2 to mutually connect with the reactor L in parallel and then connect with the neutral point and the ground end. The neutral point grounding system via a combination of a reactance and a resistor can effectively eliminate power grid grounding faults and ensure an electric power system to safely operate.

Description

A kind of neutral point is through the grounding system of reactance and resistance combination
Technical field
The utility model relates to the grounding system of a kind of neutral point through reactance and resistance combination.
Background technology
The neutral grounding mode of electric power system has the multiple form of expression, but can be divided into two big types basically: every circuit breaker that needs interdicts the single phase ground fault person, belongs to big electric current earthing mode; Every single-phase earthing electric arc can moment extinguisher voluntarily, belong to the small current neutral grounding mode.In big electric current earthing mode, mainly contain: neutral-point solid ground mode, resistance and low resistance grounding mode etc. in the neutral point warp.In the small current neutral grounding mode, mainly contain: neutral point resonance (through arc suppression coil) earthing mode, the isolated neutral mode, neutral point is through high resistance grounding mode etc.In the electrical network of the 6~35kV of China, that the neutral point operational mode mainly contains is earth-free, through grounding through arc, through operational modes such as low resistance groundings.
Power distribution network is main with earth-free mode still at present, and in this system, power supply reliability is high, but intermittent arc overvoltage can reach 3~4 times of magnitudes of voltage, and the probability that ferro resonance takes place in addition is also big, causes accidents such as device damage easily.The maturation of automatic tuning arc depression coil technology has promoted the development of resonance grounding mode, and arc suppression coil has certain effect to suppressing system's overvoltage, but the fast reaction of arc suppression coil, aspects such as linear compensation and reduction harmonic pollution are still waiting further research.In above-mentioned two kinds of earthing modes, there is the technology of a key not to be solved, that is exactly quick, the accurate route selection and the location of single phase ground fault, and uses arc suppression coil the situation of increase system overvoltage amplitude to occur.Along with the increase of cable line in the electrical network, the medium voltage network neutral point adopts the operational mode through low resistance grounding in recent years.Behind low resistance grounding, can reduce the overvoltage amplitude effectively, excise faulty line rapidly, dwindle fault coverage; But its power supply reliability significantly reduces, but when high resistance earthing fault took place, fault point voltage was high; Residual flow is little, and protection sensitivity reduces, and personal safety is caused very big threat.Therefore, existing earth neutral system can not effectively be got rid of electrical network earth fault, can not guarantee the safe operation of electric power system.
Summary of the invention
The purpose of the utility model is to overcome the defective of prior art and the grounding system of a kind of neutral point through the combination of reactance and resistance is provided, and the combination through reactance and resistance makes neutral ground, gets rid of electrical network earth fault effectively, the assurance safe operation of power system.
The technical scheme that realizes above-mentioned purpose is:
A kind of neutral point is through the grounding system of reactance and resistance combination, and said neutral point is arranged in power distribution network, and said grounding system comprises the bleeder resistance r of three groups of parallel connections 0With direct-to-ground capacitance C 0, reactor L, pressure limiting resistance R Xy, the route selection resistance R Xx, control switch K 1With control switch K 2, wherein:
The bleeder resistance r of described three groups of parallel connections 0With direct-to-ground capacitance C 0Connect threephase cable and ground;
The pressure limiting resistance R XySeries connection control switch K 1Branch road, route selection resistance R XxSeries connection control switch K 2Branch road be connected said neutral point and ground after reactor L is parallel with one another.
Above-mentioned neutral point is through the grounding system of reactance and resistance combination, and wherein, said reactor L is a controlled reactor.
The beneficial effect of the utility model is: the utility model makes neutral ground through the combination of reactance and resistance, gets rid of electrical network earth fault effectively, guarantees safe operation of power system.
Description of drawings
Fig. 1 is the structural representation of the neutral point of the utility model through the grounding system of reactance and resistance combination.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further.
See also Fig. 1, the neutral point of the utility model comprises the bleeder resistance r of three groups of parallel connections through the grounding system of reactance and resistance combination 0With direct-to-ground capacitance C 0, reactor L, pressure limiting resistance R Xy, the route selection resistance R Xx, control switch K 1With control switch K 2, wherein:
Neutral point 0 is arranged in power distribution network;
The bleeder resistance r of three groups of parallel connections 0With direct-to-ground capacitance C 0, promptly the three-phase load of symmetry connects threephase cable (A, B, C) and ground, the bleeder resistance r of every group of parallel connection 0With direct-to-ground capacitance C 0A corresponding phase;
The pressure limiting resistance R XySeries connection control switch K 1Branch road, route selection resistance R XxSeries connection control switch K 2Branch road be connected neutral point 0 and ground after reactor L is parallel with one another, reactor L is a controlled reactor.
In the utility model, when electric power system generation single phase ground fault, reactor L gives full play to the compensating action of reactor L by regulating the compensate for failed electric current in advance, makes the fault point residual flow less than 10A, reaches the purpose of blow-out.If overvoltage more than 2.5 times appears in electric power system, drop into the pressure limiting resistance R Xy, become reactor L parallel connection pressure limiting resistance R XyEarthing mode, pressure limiting resistance R behind the certain hour XyWithdraw from; The earth fault duration surpasses preset value, or continuous three times are dropped into the pressure limiting resistance R XyAfter, drop into the route selection resistance R Xx, become reactor L parallel connection route selection resistance R XxEarthing mode is through the route selection resistance R XxChange the zero sequence loop parameter, utilize zero-sequenceprotection to carry out failure line selection, excise permanent earth fault fast; If route selection is unsuccessful, or switch is failure to actuate, and delay adjustments time earth fault does not disappear, and still excises the route selection resistance R Xx, get back to neutral point resonance grounding mode.This moment, transition resistance was bigger, and the overvoltage amplitude can be very not high; The simultaneous ground fault electric current is less, has reduced the threat to personal safety.
The utility model is through the flexible variation of neutral grounding mode; Give full play to the effect that pressure limiting resistance limits high power overvoltage and route selection resistance increase fault current; Size through control making time and parallel resistance resistance realizes going after profit or gain fraud; Add the resonance grounding compensating action, the combination earthing mode makes and compensation, pressure limiting, the route selection Trinity has improved the power supply reliability of power distribution network and the device security of circuit.
Above embodiment only supplies to explain the usefulness of the utility model; But not to the restriction of the utility model; The technical staff in relevant technologies field under the situation of spirit that does not break away from the utility model and scope, can also make various conversion or modification; Therefore all technical schemes that are equal to also should belong to the category of the utility model, should be limited each claim.

Claims (2)

1. a neutral point is through the grounding system of reactance and resistance combination, and said neutral point is arranged in power distribution network, it is characterized in that, said grounding system comprises the bleeder resistance r of three groups of parallel connections 0With direct-to-ground capacitance C 0, reactor L, pressure limiting resistance R Xy, the route selection resistance R Xx, control switch K 1With control switch K 2, wherein:
The bleeder resistance r of described three groups of parallel connections 0With direct-to-ground capacitance C 0Connect threephase cable and ground;
The pressure limiting resistance R XySeries connection control switch K 1Branch road, route selection resistance R XxSeries connection control switch K 2Branch road be connected said neutral point and ground after reactor L is parallel with one another.
2. neutral point according to claim 1 is characterized in that through the grounding system of reactance and resistance combination said reactor L is a controlled reactor.
CN2012201136804U 2012-03-23 2012-03-23 Neutral point grounding system via combination of reactance and resistor Expired - Fee Related CN202535052U (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
CN2012201136804U CN202535052U (en) 2012-03-23 2012-03-23 Neutral point grounding system via combination of reactance and resistor

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102593808A (en) * 2012-03-23 2012-07-18 上海市电力公司 System for grounding neutral point by using combination of reactor and resistors
CN103236687A (en) * 2013-04-19 2013-08-07 国家电网公司 Short-time controllable reactor compensation method
CN103384065A (en) * 2013-06-25 2013-11-06 合肥天海电气技术有限公司 Bias magnetic type arc suppression coil automatic tracking compensation method
CN104734134A (en) * 2015-04-09 2015-06-24 国家电网公司 Inverter grounding system
CN105119251A (en) * 2015-07-23 2015-12-02 华南理工大学 Method suitable for determining grounding resistance scheme of flexible direct-current power distribution system
CN106655120A (en) * 2016-11-30 2017-05-10 孙嘉宁 Intelligent ground protection method and system for neutral point of power distribution network
CN104767191B (en) * 2015-04-09 2019-04-05 国家电网公司 A kind of inverter earthed system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102593808A (en) * 2012-03-23 2012-07-18 上海市电力公司 System for grounding neutral point by using combination of reactor and resistors
CN103236687A (en) * 2013-04-19 2013-08-07 国家电网公司 Short-time controllable reactor compensation method
CN103236687B (en) * 2013-04-19 2015-07-01 国家电网公司 Short-time controllable reactor compensation method
CN103384065A (en) * 2013-06-25 2013-11-06 合肥天海电气技术有限公司 Bias magnetic type arc suppression coil automatic tracking compensation method
CN104734134A (en) * 2015-04-09 2015-06-24 国家电网公司 Inverter grounding system
CN104767191B (en) * 2015-04-09 2019-04-05 国家电网公司 A kind of inverter earthed system
CN105119251A (en) * 2015-07-23 2015-12-02 华南理工大学 Method suitable for determining grounding resistance scheme of flexible direct-current power distribution system
CN105119251B (en) * 2015-07-23 2018-04-13 华南理工大学 A kind of definite method for being applicable in flexible direct current distribution system ground resistance scheme
CN106655120A (en) * 2016-11-30 2017-05-10 孙嘉宁 Intelligent ground protection method and system for neutral point of power distribution network

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C14 Grant of patent or utility model
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CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20121114

Termination date: 20200323