CN201498988U - ZnO and SiC compound circuit used for arc extinction, harmony extinction and overvoltage protection - Google Patents

ZnO and SiC compound circuit used for arc extinction, harmony extinction and overvoltage protection Download PDF

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Publication number
CN201498988U
CN201498988U CN200920228741XU CN200920228741U CN201498988U CN 201498988 U CN201498988 U CN 201498988U CN 200920228741X U CN200920228741X U CN 200920228741XU CN 200920228741 U CN200920228741 U CN 200920228741U CN 201498988 U CN201498988 U CN 201498988U
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zno
sic
extinction
parallel
nonlinear resistance
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CN200920228741XU
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Chinese (zh)
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朱仲彦
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朱仲彦
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Abstract

A ZnO and SiC compound circuit used for arc extinction, harmony extinction and over-voltage protection is characterized in that three groups of ZnO nonlinear resistors (1, 4 and 7) are respectively serially connected with three groups of SiC and ZnO nonlinear resistors (2 and 3), (5 and 6) and (8 and 9) which are connected in parallel, so as to form a star connection, a connected node is a neutral point, and parallel components of SiC and ZnO nonlinear resistors (10 and 11) are connected between the neutral point (12) and the ground (13) in parallel. The grounding device with the functions of arc extinction, harmony extinction and over-voltage protection can replace an inductance type arc extinction coil made of wound nonferrous metal, has the advantages of low cost, small volume and light weight, can eliminate the ferromagnetic resonance and restrain the surge current, has good functions of damping and arc extinction, and can effectively restrain the over-voltage between phases of the relative earth poles of an indirectly-grounded system to lower voltage level.

Description

The ZnO and the SiC compound circuit that are used for extinguishing arc, harmonic elimination and overvoltage protection

Technical field

The utility model relates to a kind of technology of extinguishing arc, harmonic elimination and overvoltage protection of the 6.3kv-35kv of being applied to high tension distribution system; it specifically is a kind of composite component of forming by the varistor of ZnO and SiC different qualities; can be according to the needs of different purposes; the connection in series-parallel combination that the mode of carrying out differs, ZnO that is used for extinguishing arc, harmonic elimination and overvoltage protection that makes and SiC compound circuit.

Background technology

Carborundum SiC nonlinear resistance is that a kind of leakage current is big, non linear coefficient α little (α=2~9) and residual voltage height, the resistance device that discharge capacity is less relatively, external main field suppression resistor, the domestic harmonic-eliminating resistor that is mainly used in the voltage transformer neutral point as generator; Zinc oxide ZnO nonlinear resistance is that a kind of leakage current is little, and non linear coefficient α big (α=30~50) and residual voltage are low, and discharge capacity is big, can hold the resistance device high, that the antisurge ability is strong.But the varistor that this two specific character is different all can exist some not enough and certain technical problem in the process of using separately separately.As: domestic and international big-and-middle-sized hydraulic generator unit all adopts the SiC nonlinear resistance to make de-excitation resistance at present, because the leakage current of SiC nonlinear resistance is bigger, conducting voltage is low, field circuit breaker is easy to the change of current, but when high-current on-off, needs to sacrifice demagnetizing time, so need a large amount of SiC nonlinear resistance parallel connections when using, otherwise will cause that residual voltage is too high, and cause field circuit breaker to burn, accidents such as demagnetization failure; For satisfying the requirement of quick de-excitation, because the conducting voltage of ZnO nonlinear resistance is higher, there is the field circuit breaker of the fracture arc voltage of certain altitude to match, otherwise is difficult for the change of current, and the parallel running of ZnO nonlinear resistance, be difficult to realize current-sharing.Present overvoltage protection both domestic and external (comprising lightning arrester); all adopt the single zinc oxide ZnO valve plate composition that is in series; its V1ma threshold voltage need be considered the influence of chargeability; often obtain very high; can only play a protective role to surge impacts such as anti lightnings, and powerless only not to comparatively very long switching overvoltage of time.

Summary of the invention

The purpose of this utility model provides that a kind of cost is low, volume is little, the compound circuit of lightweight ZnO and SiC, can be widely used in Generator Set extinguishing arc, harmonic elimination and various overvoltage protection and demagnetization circuit.

A kind of ZnO and SiC compound circuit that is used for extinguishing arc, harmonic elimination and overvoltage protection; it is characterized in that: the circuit after being in parallel with three groups of SiC and ZnO nonlinear resistance respectively by three groups of ZnO nonlinear resistances is in series; form Y-connection; its connected node is a neutral point, between neutral point and ground and connect the parallel component of SiC and ZnO nonlinear resistance.Be in series by the parallel circuits of ZnO nonlinear resistance and SiC and ZnO nonlinear resistance and form anti-lightning strike and prevent the protective circuit of switching overvoltage; Be in parallel by SiC and ZnO nonlinear resistance and form demagnetization circuit of generator.

The utility model makes full use of the characteristics that holding of zinc oxide ZnO valve plate is high, residual voltage is low, leakage current is little, discharge capacity is big; make assembly with the SiC valve block connection in series-parallel that residual voltage is high, can be widely used in extinguishing arc, harmonic elimination and various over-pressure safety device and demagnetization field.Adopt the zinc oxide ZnO valve plate that discharge capacity is big, nonlinear characteristic is good, in the process of anti-thunderbolt and anti-switching overvoltage, have lower residual voltage; The carborundum SiC valve block that is in series with it has the advantages that discharge capacity is little, residual voltage is high, can offset because of power-supply fluctuation influence, and can play current limliting and guarantee the effect of safe and reliable operation under the operating condition of maximum peak voltage.Because the SiC leakage current is bigger, SiC can play damping action to ferro resonance during normal the operation, when single-phase intermittence arc grounding overvoltage takes place, though reaching mutually, fault earthing perfects relative neutral point current potential for phase voltage, but at this moment bigger displacement has taken place in neutral point current potential, a large amount of zero-sequence currents can pass through high energy SiC and ZnO parallel component, can play the effect of positive extinguishing arc and restriction overvoltage surge.

Extinguishing arc, harmonic elimination and the overvoltage protection earthing device made with the utility model; alternative inductive type arc suppression coil with the non-ferrous metal coiling; not only cost is low, volume is little, in light weight but also offset except that ferro resonance and suppress surge current and have good damping and extinguishing arc effect; can with the non-direct ground system electrical network relatively reach phase and phase between overvoltage; effectively be limited in lower voltage levvl, extensively adopt to have great economic worth.

Description of drawings

Fig. 1 is the ZnO and the SiC high energy resistance compound circuit figure of extinguishing arc, harmonic elimination and overvoltage protection among the embodiment 1;

Fig. 2 is the ZnO and the SiC nonlinear resistance compound circuit figure of overvoltage protection among the embodiment 2;

Fig. 3 is the ZnO and the SiC high energy resistance compound circuit figure of generator quick de-excitation among the embodiment 3.

1,4,7,3,6,9,11,14,16, the 18-ZnO nonlinear resistance among the figure:, 2,5,8,10,15,17-SiC nonlinear resistance, the 19-electric generator rotor coil, the 20-field circuit breaker, 21-generator unit stator, 22-three phase mains, the 23-rectifier transformer, the 24-silicon controlled rectifier, 12-neutral point, 13-earth point.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing: among Fig. 1; described ZnO and the SiC compound circuit that is used for extinguishing arc, harmonic elimination and overvoltage protection; by three groups of ZnO nonlinear resistances 1,4,7 respectively with three groups of SiC and ZnO nonlinear resistance 2,3; 5,6; 8,9 circuit after being in parallel are in series; form Y-connection, its connected node is a neutral point, neutral point 12 with between 13 and connect the parallel component of SiC and ZnO nonlinear resistance 10,11.

Fig. 2 is in series by the parallel circuits of ZnO nonlinear resistance 14 and SiC and ZnO nonlinear resistance 15,16 and forms anti-lightning strike and prevent the protective circuit of switching overvoltage.

Fig. 3 is in parallel by SiC and ZnO nonlinear resistance 17,18 and forms demagnetization circuit of generator.

Embodiment 1: Fig. 1 shows.

By three groups of ZnO nonlinear resistances 1,4,7 respectively with three groups of SiC and ZnO nonlinear resistance 2,3,5,6,8,9 circuit after being in parallel are in series, form Y-connection, its connected node is a neutral point, between neutral point 12 and ground 13 and connect the parallel component of SiC and ZnO nonlinear resistance 10,11.Three-phase is symmetrical substantially during normal the operation, and neutral point 12 current potentials are zero; When electrical network improper operating mode took place or brings out resonance, the neutral point current potential was subjected to displacement, and this circuit has damped harmonic oscillation and suppresses the effect of overvoltage surge.

2. extinguishing arc, harmonic elimination and the overvoltage protection of the SiC between 13 and the parallel component composition of ZnO nonlinear resistance 10,11 at neutral point 12 and ground.During normal the operation, 10 pairs of ferro resonances of SiC resistance play damping action, when single-phase intermittence arc grounding overvoltage takes place, the relative neutral point current potential of fault earthing still is a phase voltage, perfect relative neutral point current potential and also still be phase voltage, but at this moment bigger displacement takes place in the neutral point current potential, and a large amount of zero-sequence currents can pass through high energy SiC and ZnO parallel component, can play the effect of positive extinguishing arc and the overvoltage of restriction surge.

The extinguishing arc, harmonic elimination and the overvoltage protection earthing device that adopt the utility model to make; alternative inductive type arc suppression coil with the non-ferrous metal coiling; not only cost is low, volume is little, in light weight but also offset except that ferro resonance and suppress surge current and have good damping and extinguishing arc, harmonic elimination effect, can with the non-direct ground system electrical network relatively reach phase and phase between overvoltage effectively be limited in lower voltage levvl.

Embodiment 2: Fig. 2 shows.

Be in series by the parallel circuits of ZnO nonlinear resistance 14 and SiC and ZnO nonlinear resistance 15,16 and form anti-lightning strike and prevent the protective circuit of switching overvoltage.

Present overvoltage protection both domestic and external (comprising lightning arrester); the all single employing zinc oxide ZnO valve plate composition that is in series; owing to need to consider the influence of chargeability; its V1ma threshold voltage is often obtained very high; can only play a protective role to surge impacts such as anti lightnings, be powerless and comparatively very long switching overvoltage of time is levied.

Adopt the overvoltage protection device circuit of the utility model (Fig. 2); ZnO nonlinear resistance 14 is in series with SiC nonlinear resistance 15; its total V1ma threshold voltage is the rated peak voltage of system power supply; SiC nonlinear resistance 15 mainly plays the current-limiting protection effect in circuit; adopt nonlinear characteristic good ZnO nonlinear resistance 16 to be in parallel, in circuit, can play the effect that too high residual voltage appears in restriction SiC nonlinear resistance 15 two ends with SiC nonlinear resistance 15.With the overvoltage protection among Fig. 2 (or lightning arrester), except that lower residual voltage is arranged, also can have damping and pressure limiting effect to time comparatively very long resonance and switching overvoltage.

Embodiment 3: Fig. 3 shows.

Domestic and international big-and-middle-sized hydraulic generator unit all adopts the nonlinear resistance demagnetization at present, make de-excitation resistance with the SiC nonlinear resistance, be easy to current-sharing, in addition because the leakage current of SiC nonlinear resistance is bigger, conducting voltage is low, be convenient to field circuit breaker and cut-off, but when high-current on-off, need to sacrifice demagnetizing time, so need a large amount of SiC nonlinear resistances to be in parallel, otherwise will cause too high residual voltage, and cause the demagnetization failure, field circuit breaker burns; Adopt the ZnO nonlinear resistance to make de-excitation resistance, though can satisfy the requirement of quick de-excitation, higher because of the conducting voltage of ZnO nonlinear resistance, the fracture arc voltage that opens circuit in magnetic field to be had relatively high expectations, the change of current is very difficult, and the parallel running of ZnO nonlinear resistance is difficult for current-sharing.

The utility model is in parallel with two kinds of nonlinear resistances of SiC and ZnO, and 17 is the SiC nonlinear resistance among Fig. 3; 18 is the ZnO nonlinear resistance, and 19 is electric generator rotor coil, and after two assembly parallel runnings, field circuit breaker 20 both had been convenient to the change of current, can not cause too high residual voltage when high-current on-off again, and can satisfy the requirement of quick de-excitation.

Claims (3)

1. a ZnO and SiC compound circuit that is used for extinguishing arc, harmonic elimination and overvoltage protection; it is characterized in that: the circuit after being in parallel with three groups of SiC and ZnO nonlinear resistance (2,3), (5,6), (8,9) respectively by three groups of ZnO nonlinear resistances (1,4,7) is in series; form Y-connection; its connected node is a neutral point, between neutral point (12) and ground (13) and connect the parallel component of SiC and ZnO nonlinear resistance (10,11).
2. a kind of ZnO and SiC compound circuit that is used for extinguishing arc, harmonic elimination and overvoltage protection according to claim 1 is characterized in that: be in series by the parallel circuits of ZnO nonlinear resistance (14) and SiC and ZnO nonlinear resistance (15,16) and form anti-lightning strike and prevent the protective circuit of switching overvoltage.
3. a kind of ZnO according to claim 1 and SiC compound circuit is characterized in that: be in parallel by SiC and ZnO nonlinear resistance (17,18) and form demagnetization circuit of generator.
CN200920228741XU 2009-10-10 2009-10-10 ZnO and SiC compound circuit used for arc extinction, harmony extinction and overvoltage protection CN201498988U (en)

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Application Number Priority Date Filing Date Title
CN200920228741XU CN201498988U (en) 2009-10-10 2009-10-10 ZnO and SiC compound circuit used for arc extinction, harmony extinction and overvoltage protection

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102074949A (en) * 2011-03-01 2011-05-25 常州莱宝电力滤波有限公司 Integrated protecting circuit for resisting peak surge, operation, resonance and lightning strike over-voltage
CN102394562A (en) * 2011-10-28 2012-03-28 深圳可雷可科技股份有限公司 ZnO and SiC composite circuit for generator rotor de-excitation and overvoltage protection
CN102684156A (en) * 2012-03-15 2012-09-19 哈尔滨电机厂有限责任公司 Field discharge and overvoltage protective device for large-sized generator rotor
CN103050952A (en) * 2011-10-14 2013-04-17 安徽一天电气技术有限公司 Bus type large-capacity overvoltage protection device
CN103094890A (en) * 2011-11-02 2013-05-08 上官春轶 Flexible limited current circuit
CN103368165A (en) * 2012-03-05 2013-10-23 顾敏珠 Arc elimination and harmonic elimination and overvoltage protector
CN103824684A (en) * 2014-02-12 2014-05-28 合肥多安自动化技术有限公司 Comprehensive once current-limiting and voltage-limiting resonance eliminator
CN104348146A (en) * 2014-10-28 2015-02-11 江苏大学 Surge protection circuit of bridge type structure
CN105356436A (en) * 2014-08-18 2016-02-24 上海舒盈电气有限公司 Multi-functional integrated circuit protection device
CN109449906A (en) * 2018-08-06 2019-03-08 常州瑞起电器配件制造有限公司 Harmonic elimination apparatus of ultra-high voltage transformer station

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102074949B (en) * 2011-03-01 2014-03-12 江苏莱宝电力滤波有限公司 Integrated protecting circuit for resisting peak surge, operation, resonance and lightning strike over-voltage
CN102074949A (en) * 2011-03-01 2011-05-25 常州莱宝电力滤波有限公司 Integrated protecting circuit for resisting peak surge, operation, resonance and lightning strike over-voltage
CN103050952A (en) * 2011-10-14 2013-04-17 安徽一天电气技术有限公司 Bus type large-capacity overvoltage protection device
CN102394562B (en) * 2011-10-28 2014-02-26 深圳可雷可科技股份有限公司 ZnO and SiC composite circuit for generator rotor de-excitation and overvoltage protection
CN102394562A (en) * 2011-10-28 2012-03-28 深圳可雷可科技股份有限公司 ZnO and SiC composite circuit for generator rotor de-excitation and overvoltage protection
CN103094890A (en) * 2011-11-02 2013-05-08 上官春轶 Flexible limited current circuit
CN103368165A (en) * 2012-03-05 2013-10-23 顾敏珠 Arc elimination and harmonic elimination and overvoltage protector
CN102684156A (en) * 2012-03-15 2012-09-19 哈尔滨电机厂有限责任公司 Field discharge and overvoltage protective device for large-sized generator rotor
CN103824684A (en) * 2014-02-12 2014-05-28 合肥多安自动化技术有限公司 Comprehensive once current-limiting and voltage-limiting resonance eliminator
CN105356436A (en) * 2014-08-18 2016-02-24 上海舒盈电气有限公司 Multi-functional integrated circuit protection device
CN105356436B (en) * 2014-08-18 2019-06-28 上海舒盈电气有限公司 Multifunctional comprehensive circuit protection device
CN104348146A (en) * 2014-10-28 2015-02-11 江苏大学 Surge protection circuit of bridge type structure
CN104348146B (en) * 2014-10-28 2017-02-22 江苏大学 Surge protection circuit of bridge type structure
CN109449906A (en) * 2018-08-06 2019-03-08 常州瑞起电器配件制造有限公司 Harmonic elimination apparatus of ultra-high voltage transformer station

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Free format text: CORRECT: ADDRESS; FROM: 430010 ROOM 3-204, CHANGKEYUAN DORMITORY, JIUWANFANG, JIANG AN DISTRICT, WUHAN CITY, HUBEI PROVINCE TO: 518114 2/F, BUILDING D, FACTORY BUILDING 2, NO.8, BAODAN ROAD, DANZHUTOU INDUSTRIAL ZONE, NANWAN SUBDISTRICT, LONGGANG DISTRICT, SHENZHEN CITY

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Owner name: SHENZHEN CLAKE TECHNOLOGY CO., LTD.

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Address after: 518114 Shenzhen District of Longgang city streets of the South Bay danzhutou Industrial Zone No. 8 Building No. 2 Po Road D Building 2 floor

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Address before: 430010 Hubei province Wuhan City Jiang'an District ninety thousand square Changke hospital dormitory room 3-204

Patentee before: Zhu Zhongyan

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Address after: Buji street Longgang District Shenzhen city Guangdong province 518112 Li Long Avenue Industrial Park, Shenzhen Gan Li Hisense science and Technology Park, building third, floor eleventh

Patentee after: Shenzhen Clake Technology Co.,Ltd.

Address before: Longgang District of Shenzhen City, Guangdong province 518114 South Bay Street danzhutou Industrial Zone No. 8 Building No. 2 Po Road D Building 2 floor

Patentee before: Shenzhen Clake Technology Co., Ltd.

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