CN2722487Y - Arc and resonance extinction and overvoltage protector - Google Patents

Arc and resonance extinction and overvoltage protector Download PDF

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Publication number
CN2722487Y
CN2722487Y CN 200420079582 CN200420079582U CN2722487Y CN 2722487 Y CN2722487 Y CN 2722487Y CN 200420079582 CN200420079582 CN 200420079582 CN 200420079582 U CN200420079582 U CN 200420079582U CN 2722487 Y CN2722487 Y CN 2722487Y
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China
Prior art keywords
arc
voltage
phase
extinction
overvoltage protector
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CN 200420079582
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Chinese (zh)
Inventor
束长胜
宁仁飞
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ANHUI SAIPU POWER PROTECTION Co Ltd
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ANHUI SAIPU POWER PROTECTION Co Ltd
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Abstract

The utility model relates to an arc and resonance extinction and overvoltage protector, comprising an overvoltage protector, an arc extinction assembly, a microcomputer controller and a voltage transformer. The arc and resonance extinction and overvoltage protector apparatus is characterized in that the overvoltage protector is composed of four zinc oxide electric resistances and a unit protector which is connected with the gap of the electric resistance in series, the arc extinction assembly is composed of four single-phase high-voltage switches and a high power voltage limiter. The utility model can effectively inhibit the single-phase intermittent arcing ground of a non-direct grounding electric network with 3-35KV neutral points and the over-voltage caused by the harmonic oscillation. The arc and resonance extinction and overvoltage protector has simple structure, small volume, convenient installation and debugging, cheap price and safe use; the arc and resonance extinction and overvoltage protector can be widely used for high voltage factory system of the 3-35 KV substation and power plant, the arc and resonance extinction and overvoltage protector is available for the system which is provided with arc extinction coils.

Description

Extinguishing arc harmonic elimination and overvoltage protection
Technical field
The utility model relates to and is used for the 3-35KV system with non effectively earth ed neutral, a kind of novel overvoltage protection that provides reliably protecting to various overvoltage, particularly resonance overvoltage and the single-phase indirect arc grounding surge of this class electrical network.
Background technology
In the electrical network of 3 ~ 35KV of neutral non-effective grounding, except that lightning overvoltage, the most frequent by the overvoltage that single-phase indirect arc ground connection and resonance cause, and higher amplitude and long duration are arranged, interior insulation to electric equipment causes the damage of accumulation property, cause clearance to ground to puncture or alternate flashover initiation short circuit accident in the external insulation weak spot, cause zinc oxide arrester blast etc.
At present, for solving the long-time superpotential problem of arc grounding, be still mostly and adopt neutral point of electric network through grounding through arc.But arc suppression coil can not be eliminated the intermittence arcing ground over-voltage fully, amplitude that can not over-voltage, even in some cases, because of the existence of arc suppression coil, arc reignition may just take place constantly at maximum this least favorable of recovery voltage, and the arc grounding overvoltage is raise.Practical operating experiences proves that also in 3 ~ 35KV of neutral by arc extinction coil grounding power distribution network, the accident that is caused by electric arc and resonance happens occasionally.Change intermittent arcing ground into the directly grounded extinguishing arc measure of bus metallicity (patent No. is 99229228.x) for taking, not only cause impact to system in the moment of busbar grounding and disconnection, particularly, make in insulation level decline and may take place once more by the single-phase gap arcing ground that the overvoltage impact causes at the transient overvoltage that disconnects earth bus moment generation.
Electric equipment always has inductance or electric capacity attribute.When system operates or break down; these inductance, capacity cell form oscillation circuit; produce resonance; cause system serious resonance overvoltage to occur; jeopardize insulation of electrical installation; the overcurrent that resonance continues even burn low capacity inductance element equipment, its lasting characteristic causes selects overvoltage protection measure difficulty.
Summary of the invention
The purpose of this utility model is: a kind of 3~35KV neutral non-effective grounding electrical network that makes is provided, under various operational modes, all can effectively limit the overvoltage that single-phase indirect arc ground connection and resonance cause, all can effectively limit thunder and lightning and all kinds of switching overvoltage.
The technical solution that realizes above-mentioned purpose is as follows:
Extinguishing arc harmonic elimination and overvoltage protection comprise overvoltage protection device, extinguishing arc assembly, microcomputerized controller and voltage transformer; It is characterized in that:
A, described overvoltage protection device are made up of four cell protection devices, each cell protection device is composed in series by a common zinc oxide resistance and a resistance gap, wherein the resistance terminal of three cell protection devices is in parallel connects the resistance other end ground connection of this another cell protection device with another cell protection device; The resistance gap end of three cell protection devices connects with three-phase line respectively;
B, described extinguishing arc assembly are made up of four single-phase high voltage switches and high energy voltage limiter, wherein connect with three-phase line after three single-phase high voltage switch in parallel, another single-phase high voltage switch is with after the high energy voltage limiter is in parallel, connect the some ground connection in parallel of another single-phase high voltage switch and high energy voltage limiter again with the single-phase high voltage switch of three parallel connections; Four single-phase high voltage switches connect with the output of microcomputerized controller by deciliter coil;
Primary side one end of C, voltage transformer is serially connected on the three-phase bus between overvoltage protection device and the extinguishing arc assembly, the primary side other end of the voltage transformer ground connection that links together, and the secondary output of voltage transformer connects with the input of microcomputerized controller.
Design feature of the present utility model is that three-phase four unit-combination type high-voltage switch gears are set; at the ground unit of combined high-voltage switch high energy ZnO voltage limiter in parallel; form three-phase four unit limited pressure combined high pressure switches; these limited pressure combined high pressure switch in parallel three-phase four unit-combination type overvoltage protection devices are connected to respectively between the bus and ground of protected three-phase three wire system.Described three-phase four unit-combination type overvoltage protection devices are used to limit thunder and lightning and switching manipulation overvoltage.Described three-phase four unit limited pressure combined high pressure switches are used to eliminate the arc grounding overvoltage.For unsettled intermittence arcing ground over-voltage, device will hang down the high energy ZnO voltage limiter access fault phase of protection value by the high-voltage switch gear of closed three-phase four unit limited pressure combined high pressure switch fault phases, the recovery voltage of the electromagnetic energy that the ground connection of releasing causes, restriction ground connection phase, the fault point because of recovery voltage be limited the low electric arc extinguishing arc of can not restriking; Stable arcing ground over-voltage for low amplitude value, device is by the high-voltage switch gear of closed three-phase four unit limited pressure combined high pressure switch faults phases and ground connection, making the fault phase voltage is zero, carry out extinguishing arc, when the action involution, disconnect the high-voltage switch gear of ground connection earlier, fault disconnects after pressure limiting, avoids the fault resume combustion.When ferro-resonance over-voltage took place, at the highest voltage limiter that inserts mutually of voltage, the frequency according to resonance inserted different high-power resistance elimination resonance at voltage transformer open delta winding simultaneously.
The utility model can effectively suppress the overvoltage that the single-phase indirect arc ground connection of 3-35KV neutral nondirect earthing network and resonance cause; the mechanism of its extinguishing arc and overvoltage protection and the size of electric network capacitance and current are irrelevant; thereby the influence that not enlarged by the change of power system operating mode and electrical network; big and small networks all can use; whole device is formed a high-voltage board; simple in structure; volume is little; install; debugging is convenient; cheap; safe in utilization, can be widely used in the high pressure station-service system in 3-35KV transformer station and power plant, the former system that arc suppression coil is housed is available equally.
Description of drawings
Fig. 1 is the utility model structural representation.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described by embodiment.
Embodiment:
See Fig. 1, extinguishing arc harmonic elimination and overvoltage protection comprise overvoltage protection device 1, extinguishing arc assembly 2, microcomputerized controller 3 and voltage transformer 4.
Overvoltage protection device 1 is made up of four cell protection devices, each cell protection device is composed in series by a common zinc oxide resistance R and a resistance gap Rc, wherein the resistance terminal of three cell protection devices is in parallel connects the resistance R other end ground connection of this another cell protection device with another cell protection device; The resistance gap Rc end of three cell protection devices connects with three-phase line respectively;
Extinguishing arc assembly 2 is made up of four single-phase high voltage K switch and high energy voltage limiter 5, wherein connect with three-phase line after the parallel connection of three single-phase high voltage K switch, after another single-phase high voltage K switch and high energy voltage limiter 5 are in parallel, connect the some ground connection in parallel of another single-phase high voltage K switch and high energy voltage limiter 5 again with the single-phase high voltage switch of three parallel connections; Four single-phase high voltage switches connect with the output of microcomputerized controller by deciliter coil;
Primary side one end of C, voltage transformer is serially connected on the three-phase bus between overvoltage protection device and the extinguishing arc assembly, the primary side other end of the voltage transformer ground connection that links together, and the secondary output of voltage transformer connects with the input of microcomputerized controller.
When unstable single-phase arcing ground is taken place in system, closed immediately fault phase switch, insert voltage limiter 5, the recovery voltage of fault phase is limited in the dielectric strength tolerance in gap, can not continue to rise, ground arc is being restriked and is being put out certainly because of the restriction of the recovery voltage on the arc road can not puncture the gap behind the current zero-crossing point; When the stable single-phase arcing ground of system's generation, closed immediately fault phase switch and earthed switch, making the fault phase voltage is zero, extinguish arcs.During system resonance,, eliminate resonance with the open delta winding moment access resistance of the voltage transformer on the bus.
The variation of the three-phase voltage U a that microcomputerized controller 3 provides according to voltage transformer 4, Ub, Uc and residual voltage U0 instantaneous value is judged, and according to the result who judges, send corresponding instruction: if the fault that takes place is a unstable arc ground connection, microcomputerized controller is after judging ground connection separate, send instruction, make the switch closure of the fault phase of three-phase four unit limited pressure combined high pressure switches; High energy ZnO nonlinear resistor 5 is inserted the ground connection phases, and the recovery voltage of fault restriction phase absorbs the electromagnetic energy that ground connection causes, the relieving system vibration makes recovery voltage breakdown fault point and blow-out once more.When the detection system three-phase voltage is normal value, make high-voltage switch gear disconnect, system restoration normally moves.If the fault that takes place is a stable arc ground connection, microcomputerized controller is after judging ground connection separate, make the high-voltage switch gear of fault phase and ground connection closed simultaneously, make system be quickly converted to the direct ground connection of stable metallicity by the arc grounding of stability, the fault phase voltage reduces to zero, and electric arc disappears, after the predefined time of delaying time, disconnect the high-voltage switch gear of ground connection earlier, the high-voltage switch gear of back open failure phase.If the fault that takes place is high frequency or industrial frequency resonance, device inserts resistance by the open delta winding of instantaneous voltage transformer on bus, eliminates resonance.

Claims (1)

1, extinguishing arc harmonic elimination and overvoltage protection comprise overvoltage protection device, extinguishing arc assembly, microcomputerized controller and voltage transformer; It is characterized in that:
A, described overvoltage protection device are made up of four cell protection devices, each cell protection device is composed in series by a common zinc oxide resistance and a resistance gap, wherein the resistance terminal of three cell protection devices is in parallel connects the resistance other end ground connection of this another cell protection device with another cell protection device; The resistance gap end of three cell protection devices connects with three-phase line respectively;
B, described extinguishing arc assembly are made up of four single-phase high voltage switches and high energy voltage limiter, wherein connect with three-phase bus after three single-phase high voltage switch in parallel, another single-phase high voltage switch is with after the high energy voltage limiter is in parallel, connect the some ground connection in parallel of another single-phase high voltage switch and high energy voltage limiter again with the single-phase high voltage switch of three parallel connections; Four single-phase high voltage switches connect with the output of microcomputerized controller by deciliter coil;
Primary side one end of C, voltage transformer is serially connected on the three-phase bus between overvoltage protection device and the extinguishing arc assembly, the primary side other end of the voltage transformer ground connection that links together, and the secondary output of voltage transformer connects with the input of microcomputerized controller.
CN 200420079582 2004-09-17 2004-09-17 Arc and resonance extinction and overvoltage protector Ceased CN2722487Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200420079582 CN2722487Y (en) 2004-09-17 2004-09-17 Arc and resonance extinction and overvoltage protector

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Application Number Priority Date Filing Date Title
CN 200420079582 CN2722487Y (en) 2004-09-17 2004-09-17 Arc and resonance extinction and overvoltage protector

Publications (1)

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CN2722487Y true CN2722487Y (en) 2005-08-31

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ID=35012857

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CN 200420079582 Ceased CN2722487Y (en) 2004-09-17 2004-09-17 Arc and resonance extinction and overvoltage protector

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102646972A (en) * 2012-04-28 2012-08-22 山西科泰电气有限公司 Overvoltage protecting device for coal mine power center
CN102946094A (en) * 2012-10-10 2013-02-27 中国电力科学研究院 Suppressing measure selecting method for very fast transient overvoltage of transformer substation
CN103050962A (en) * 2011-10-14 2013-04-17 安徽一天电气技术有限公司 Grounding transfer current detection compensation device and working method thereof
CN103050963A (en) * 2011-10-14 2013-04-17 安徽一天电气技术有限公司 Arc extinguish device capable of avoiding direct grounding arc extinguish and overvoltage resetting, and working method thereof
CN105243941A (en) * 2015-11-24 2016-01-13 国网重庆市电力公司电力科学研究院 Simulation model for inhibiting ferromagnetic resonance of voltage transformer
CN106129994A (en) * 2016-08-28 2016-11-16 安徽普天电力科技有限公司 A kind of novel efficient extinguishing arc and overvoltage protection
CN106129995A (en) * 2016-08-28 2016-11-16 安徽普天电力科技有限公司 A kind of novel convenient practical arc-extinguishing harmonic-eliminating and overvoltage protection three-in-one unit
CN106300317A (en) * 2016-08-28 2017-01-04 安徽普天电力科技有限公司 A kind of extinguishing arc, extinguishing harmony, selecting line and overvoltage protection

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103050962A (en) * 2011-10-14 2013-04-17 安徽一天电气技术有限公司 Grounding transfer current detection compensation device and working method thereof
CN103050963A (en) * 2011-10-14 2013-04-17 安徽一天电气技术有限公司 Arc extinguish device capable of avoiding direct grounding arc extinguish and overvoltage resetting, and working method thereof
CN102646972A (en) * 2012-04-28 2012-08-22 山西科泰电气有限公司 Overvoltage protecting device for coal mine power center
CN102946094A (en) * 2012-10-10 2013-02-27 中国电力科学研究院 Suppressing measure selecting method for very fast transient overvoltage of transformer substation
CN105243941A (en) * 2015-11-24 2016-01-13 国网重庆市电力公司电力科学研究院 Simulation model for inhibiting ferromagnetic resonance of voltage transformer
CN106129994A (en) * 2016-08-28 2016-11-16 安徽普天电力科技有限公司 A kind of novel efficient extinguishing arc and overvoltage protection
CN106129995A (en) * 2016-08-28 2016-11-16 安徽普天电力科技有限公司 A kind of novel convenient practical arc-extinguishing harmonic-eliminating and overvoltage protection three-in-one unit
CN106300317A (en) * 2016-08-28 2017-01-04 安徽普天电力科技有限公司 A kind of extinguishing arc, extinguishing harmony, selecting line and overvoltage protection

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GR01 Patent grant
C35 Partial or whole invalidation of patent or utility model
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Decision date of declaring invalidation: 20060715

Decision number of declaring invalidation: 8529