CN202424162U - Microcomputer arc and harmonic elimination and overvoltage protection device - Google Patents
Microcomputer arc and harmonic elimination and overvoltage protection device Download PDFInfo
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- CN202424162U CN202424162U CN2011204540227U CN201120454022U CN202424162U CN 202424162 U CN202424162 U CN 202424162U CN 2011204540227 U CN2011204540227 U CN 2011204540227U CN 201120454022 U CN201120454022 U CN 201120454022U CN 202424162 U CN202424162 U CN 202424162U
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Abstract
The utility model relates to a microcomputer arc and harmonic elimination and overvoltage protection device. The device comprises a cabinet and a voltage transformer, a microcomputer controller, an alternating current (AC) vacuum rapid contactor, a high-capacity three-phase combined overvoltage protector, a high-voltage isolation switch, a high-voltage current limiting fuse, a zero-sequence current transformer, a grounding ammeter and a changeover switch which are arranged on the cabinet and electrically connected to form a loop. The voltage transformer and the changeover switch are arranged on the side wall of the cabinet; and the microcomputer controller, the AC vacuum rapid contactor, the high-capacity three-phase combined overvoltage protector, the high-voltage isolation switch, the high-voltage current limiting fuse, the zero-sequence current transformer and the grounding ammeter are arranged in the cabinet. The microcomputer arc and harmonic elimination and overvoltage protection device can improve the running safety and power supply reliability of a power grid.
Description
Technical field
The utility model relates to a kind of protective device, relates in particular to a kind of microcomputer extinguishing arc harmonic elimination and overvoltage protection.
Background technology
Along with social development, the safe operation of electric power system and the reliability of power supply have seemed more and more important.For a long time, in the 3-35kv isolated neutral system, the single phase ground fault evolution generally is: intermittent arcing ground → stable arc ground connection → metal ground connection.Overvoltage is the most serious when intermittent arc grounding, and the overvoltage of its non-fault phase can reach 3.15-3.5 times of normal operation phase voltage, even higher.
High like this overvoltage long duration of action is in electrical network; Will cause the accumulation property damage of electric equipment and system insulation; Form the insulation weak spot, and then puncture also finally causes the phase fault accident over the ground, and can cause following accident: the puncture of insulation of electrical installation; Cable is blown out phenomenon; The voltage transformer supersaturation excites ferro resonance easily, causes PT to burn; Explosion of on Arrester when having served as voltage energy and surpassing the energy that lightning arrester can bear, will cause lightning-arrest blast.
The utility model content
In view of this; Be necessary to provide a kind of microcomputer extinguishing arc harmonic elimination and overvoltage protection; When it is intended to metal ground connection; Mainly, mainly carry out route selection during arc grounding, the low problem of route selection accuracy rate when having overcome the slow and arc grounding of conventional line selection apparatus route selection speed according to the sudden change amount of circuit zero-sequence current before and after the device action according to the amplitude route selection of circuit zero-sequence current; Not only fundamentally destroy the condition of ferro resonance, avoided " the burning PT " and the accident of " quick-fried insurance " that cause because of overvoltage simultaneously.
The utility model is to realize like this; A kind of microcomputer extinguishing arc harmonic elimination and overvoltage protection; It comprises cabinet and is installed in voltage transformer, microcomputerized controller, AC vacuum rapid contactless, the high energy that electric connection on the said cabinet becomes the loop and holds three phase combined over-voltage protector, high voltage isolator, high-voltage and current-limitation fuse, zero sequence current mutual inductor, earth current meter and change over switch; Said voltage transformer and said change over switch are arranged on the sidewall of said cabinet, and said microcomputerized controller, said AC vacuum rapid contactless, said high energy hold the inside that three phase combined over-voltage protector, said high voltage isolator, said high-voltage and current-limitation fuse, said zero sequence current mutual inductor and said earth current meter are arranged on said cabinet.
Further improvement as such scheme; Said voltage transformer is electrically connected between said microcomputerized controller and the said high-voltage and current-limitation fuse; The contact jaw of said AC vacuum rapid contactless is electrically connected at the other end of said high-voltage and current-limitation fuse; Its connecting lever is electrically connected at said microcomputerized controller, and said zero sequence current mutual inductor is electrically connected at the earth cable of said AC vacuum rapid contactless, and said zero sequence current mutual inductor also is connected in series with said earth current meter; The end that said high energy holds three phase combined over-voltage protector is electrically connected between said voltage transformer and the said high-voltage and current-limitation fuse; The electrical ground connection of its other end, an end of said high voltage isolator electrically connects via main inlet wire, and its other end is electrically connected between said voltage transformer and the said high-voltage and current-limitation fuse.
Further improvement as such scheme; Said three phase combined over-voltage protector comprises a plurality of nonlinear resistances; Wherein one the electrical ground connection of an end in said a plurality of nonlinear resistance, its other end is via being electrically connected between said voltage transformer and the said high-voltage and current-limitation fuse in said a plurality of nonlinear resistances.
Further improvement as such scheme; Said microcomputer extinguishing arc harmonic elimination and overvoltage protection also comprise fuse; One end of said fuse is electrically connected at said voltage transformer, and the other end of said fuse is electrically connected between said high-voltage and current-limitation fuse and the said three phase combined over-voltage protector.
As the further improvement of such scheme, the outer wall of said cabinet is provided with the controller panel that electrically connects with said microcomputerized controller.
The microcomputer extinguishing arc harmonic elimination that the utility model provides and the advantage of overvoltage protection are following:
1, device action speed is fast, shortens the duration of single-phase earthing electric arc greatly;
2, extinguish arcs immediately behind the device action, and can effectively limit the arc light grounding surge;
3, behind the device action, the capacitance current that allows 200A is continuously through more than at least two hours, and the user can be at the handling failure circuit after the grid switching operation of accomplishing transfer load;
4, the defencive function of this device does not receive the influence of electric scale and operational mode;
5, this device has high cost performance;
6, the maximum characteristics of faulty line zero-sequence current sudden change amount were carried out route selection before and after this device utilized arc extinction, can improve the route selection accuracy rate greatly.
Description of drawings
The microcomputer extinguishing arc harmonic elimination that Fig. 1 provides for the utility model preferred embodiments and the front view of overvoltage protection.
Fig. 2 is the left view of microcomputer extinguishing arc harmonic elimination and overvoltage protection among Fig. 1.
Symbol description
| Microcomputer extinguishing arc harmonic elimination and |
100 |
| |
200 |
| Voltage transformer | 1 |
| |
2 |
| The AC vacuum rapid contactless | 3 |
| High energy holds three phase combined over-voltage |
4 |
| |
5 |
| High-voltage and current- |
6 |
| Zero sequence current mutual inductor and earth |
7 |
| Change over |
8 |
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Please consult Fig. 1 and Fig. 2 in the lump; The microcomputer extinguishing arc harmonic elimination that it provides for the utility model preferred embodiments and the circuit of overvoltage protection (MREX) 100 are formed sketch map, and MREX microcomputer extinguishing arc harmonic elimination and overvoltage protection 100 comprise cabinet 200 and the electric connection that is installed on the cabinet 200 becomes voltage transformer 1, microcomputerized controller 2, AC vacuum rapid contactless 3, the high energy in loop to hold three phase combined over-voltage protector (MRTB) 4, high voltage isolator 5, high-voltage and current-limitation fuse (FU) 6, zero sequence current mutual inductor (CT) and earth current meter 7 and change over switch 8.Voltage transformer 1 is arranged on the sidewall of cabinet 200 with change over switch 8, and microcomputerized controller 2, AC vacuum rapid contactless 3, high energy hold the inside that three phase combined over-voltage protector 4, high voltage isolator 5, high-voltage and current-limitation fuse 6, zero sequence current mutual inductor and earth current meter 7 are arranged on cabinet 200.
Voltage transformer 1 is electrically connected between microcomputerized controller 2 and the high-voltage and current-limitation fuse 6; The contact jaw of AC vacuum rapid contactless 3 is electrically connected at the other end of high-voltage and current-limitation fuse 6; Its connecting lever is electrically connected at microcomputerized controller 2; Said zero sequence current mutual inductor is electrically connected at the earth cable of AC vacuum rapid contactless 3, and said zero sequence current mutual inductor also is connected in series (so said zero sequence current mutual inductor and said earth current meter of in this execution mode, combining with label 7 expressions) with said earth current meter.The end that high energy holds three phase combined over-voltage protector 4 is electrically connected between said voltage transformer and the high-voltage and current-limitation fuse 6 the electrical ground connection of its other end.One end of high voltage isolator 5 electrically connects via main inlet wire, and its other end is electrically connected between said voltage transformer and the high-voltage and current-limitation fuse 6.
Three phase combined over-voltage protector 4 comprises a plurality of nonlinear resistances; Wherein one the electrical ground connection of an end in said a plurality of nonlinear resistance, its other end is via being electrically connected between said voltage transformer and the high-voltage and current-limitation fuse 6 in said a plurality of nonlinear resistances.
Microcomputer extinguishing arc harmonic elimination and overvoltage protection 100 also comprise fuse, and an end of said fuse is electrically connected at said voltage transformer, and the other end of said fuse is electrically connected between high-voltage and current-limitation fuse 6 and the three phase combined over-voltage protector 4.The outer wall of cabinet 200 is provided with the controller panel that electrically connects with microcomputerized controller 2.
High energy holds three phase combined over-voltage protector (MREB) 4 and mainly has the following advantages:
I, MREB overvoltage protection device adopt high energy to hold the ZnO nonlinear resistance and discharging gap combines, and both protect each other.It is zero that discharging gap makes the chargeability of ZnO nonlinear resistance, and the ZnO nonlinear resistance can not wear out;
The impact coefficient of II, MREB overvoltage protection device is 1, and the discharge voltage value equates under the various voltage waveforms, not pressurized waveform influence of protective value;
III, REB discharge moment duration is close with residual voltage, does not have a section ripple, helps protecting the turn-to-turn insulation of coiled pipe type equipment;
IV, MREB overvoltage protection device adopt four star connections, and alternate overvoltage is reduced greatly, compare with conventional lightning arrester, and alternate overvoltage reduces about 70%, and the reliability of protection greatly improves.The MREB overvoltage protection device is first device of over-voltage in this device, the contact JC do not move before with voltage limit in safe range.
But AC vacuum rapid contactless 3 is the high pressure vacuum rapid contactless JC of phase-splitting control; Vacuum contactor one end in contact bus, the direct ground connection of the other end, JC all is in off-state when normally moving; Receive the control of microcomputerized controller 2 and close a floodgate; The mutual locking of each item vacuum contactor operation circuit, after wherein each combined floodgate made this busbar grounding, other two any one mutually can be in action in mutually.The effect of JC is when system's generation arc grounding, makes by unsettled arc grounding to be transformed into the direct ground connection of stable metallicity rapidly, thereby has protected equipment, and it is without prejudice.
High-voltage and current-limitation fuse 6 is backup protection devices of whole arc-extinction device, causes the fault of phase fault in the time of can preventing to cause erroneous judgement disconnected because of mis-wired or plant failure, has following specific function: I, to cut-off capacity big, can reach 63KA; II, cut-off rapidly, switch off time is generally 1-2ms; III, current limitation effect are good, can be limited in below 1/5 of maximum dash impulse current to fault current.
Said zero sequence current mutual inductor is the voltage transformer pt that has auxiliary secondary winding, and when protected system generation single-phase earthing, the open delta voltage U △ of voltage transformer pt becomes high potential by electronegative potential immediately, and controller is devoted oneself to work.
Microcomputer extinguishing arc harmonic elimination and overvoltage protection 100 have following function: when system's generation single phase ground fault, and can be fast with the direct mutually ground connection of fault; When the PT broken string took place, device output contact signal was so that the user is to causing the relaying protection of misoperation to carry out locking because of the PT broken string; Behind the device action, panel shows fault type (PT broken string, metal ground connection or arc grounding) and separate, exports passive contact point signal simultaneously, and device configuration RS485 interface can carry out transfer of data according to the communication protocol that the user provides; Device can with occur between phase and phase and and ground between various voltage limit about 3.5 times; Voltage transformer in this device can provide voltage signal to measuring instrument and relaying protection, the PT cabinet that instead is conventional; This device has the accident memory function, can write down the time and the device action state of 18 incident generations.
The advantage of microcomputer extinguishing arc harmonic elimination and overvoltage protection 100 is following: 1, device action speed is fast, shortens the duration of single-phase earthing electric arc greatly; 2, extinguish arcs immediately behind the device action, and can effectively limit the arc light grounding surge; 3, behind the device action, the capacitance current that allows 200A is continuously through more than at least two hours, and the user can be at the handling failure circuit after the grid switching operation of accomplishing transfer load; 4, the defencive function of this device does not receive the influence of electric scale and operational mode; 5, this device has high cost performance; 6, the maximum characteristics of faulty line zero-sequence current sudden change amount were carried out route selection before and after this device utilized arc extinction, can improve the route selection accuracy rate greatly.
In sum, microcomputer extinguishing arc harmonic elimination and overvoltage protection are when its system normally moves; Open delta voltage U △ is very little; Control its panel and show " RUN ", when U △ becomes high level by low level, show that system breaks down; This moment, microcomputerized controller KZ started interruption immediately; Carry out fault type and mutually judgement according to PT secondary output voltage signal Ua, Ub, Uc:, and export passive contact point signal if single-phase PT disconnection fault then installs and shows the separate and disconnection signal of fault on the panel; If single phase ground fault then installs the separate and earthing type model of demonstration fault on the panel, to fault phase vacuum contactor the order of closing a floodgate takes place simultaneously, and export passive contact point signal; When the PT open delta voltage becomes high level by low level; Little electric current route selection module is carried out data acquisition to the zero-sequence current of each bar circuit immediately; If no single phase ground fault; Then recover normal,, then after fault phase vacuum contactor combined floodgate and extinguish arcs, once more the circuit zero-sequence current is carried out data acquisition if single phase ground fault takes place.According to faulty line maximum principle of sudden change amount before and after ground arc extinguishes, select faulty line and on panel, show the fault wire size, export passive contact point signal simultaneously.
This device is applicable to the 3-35kv intermediate voltage electric power system, and isolated neutral, neutral by arc extinction coil grounding or neutral point are through the electric power system of high resistance ground.This device also is applicable to the electrical network of cable box Lu Weizhu, the electrical network that mixes of cable and overhead transmission line, and overhead transmission line is main electrical network.
Microcomputer extinguishing arc harmonic elimination and overvoltage protection are when metal ground connection; Main amplitude route selection according to the circuit zero-sequence current; Mainly carry out route selection during arc grounding according to the sudden change amount of circuit zero-sequence current before and after the device action; Overcome the slow low problem of route selection accuracy rate during with arc grounding of conventional line selection apparatus route selection speed, not only fundamentally destroyed the condition of ferro resonance, avoided " the burning PT " and the accident of " quick-fried insurance " that cause because of overvoltage simultaneously.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (5)
1. microcomputer extinguishing arc harmonic elimination and overvoltage protection; It is characterized in that; It comprises cabinet and is installed in voltage transformer, microcomputerized controller, AC vacuum rapid contactless, the high energy that electric connection on the said cabinet becomes the loop and holds three phase combined over-voltage protector, high voltage isolator, high-voltage and current-limitation fuse, zero sequence current mutual inductor, earth current meter and change over switch; Said voltage transformer and said change over switch are arranged on the sidewall of said cabinet, and said microcomputerized controller, said AC vacuum rapid contactless, said high energy hold the inside that three phase combined over-voltage protector, said high voltage isolator, said high-voltage and current-limitation fuse, said zero sequence current mutual inductor and said earth current meter are arranged on said cabinet.
2. microcomputer extinguishing arc harmonic elimination as claimed in claim 1 and overvoltage protection; It is characterized in that; Said voltage transformer is electrically connected between said microcomputerized controller and the said high-voltage and current-limitation fuse; The contact jaw of said AC vacuum rapid contactless is electrically connected at the other end of said high-voltage and current-limitation fuse; Its connecting lever is electrically connected at said microcomputerized controller, and said zero sequence current mutual inductor is electrically connected at the earth cable of said AC vacuum rapid contactless, and said zero sequence current mutual inductor also is connected in series with said earth current meter; The end that said high energy holds three phase combined over-voltage protector is electrically connected between said voltage transformer and the said high-voltage and current-limitation fuse; The electrical ground connection of its other end, an end of said high voltage isolator electrically connects via main inlet wire, and its other end is electrically connected between said voltage transformer and the said high-voltage and current-limitation fuse.
3. according to claim 1 or claim 2 microcomputer extinguishing arc harmonic elimination and overvoltage protection; It is characterized in that; Said three phase combined over-voltage protector comprises a plurality of nonlinear resistances; Wherein one the electrical ground connection of an end in said a plurality of nonlinear resistance, its other end is via being electrically connected between said voltage transformer and the said high-voltage and current-limitation fuse in said a plurality of nonlinear resistances.
4. according to claim 1 or claim 2 microcomputer extinguishing arc harmonic elimination and overvoltage protection; It is characterized in that; Said microcomputer extinguishing arc harmonic elimination and overvoltage protection also comprise fuse; One end of said fuse is electrically connected at said voltage transformer, and the other end of said fuse is electrically connected between said high-voltage and current-limitation fuse and the said three phase combined over-voltage protector.
5. microcomputer extinguishing arc harmonic elimination as claimed in claim 1 and overvoltage protection is characterized in that, the outer wall of said cabinet is provided with the controller panel that electrically connects with said microcomputerized controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204540227U CN202424162U (en) | 2011-11-16 | 2011-11-16 | Microcomputer arc and harmonic elimination and overvoltage protection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204540227U CN202424162U (en) | 2011-11-16 | 2011-11-16 | Microcomputer arc and harmonic elimination and overvoltage protection device |
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|---|---|
| CN202424162U true CN202424162U (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204540227U Expired - Fee Related CN202424162U (en) | 2011-11-16 | 2011-11-16 | Microcomputer arc and harmonic elimination and overvoltage protection device |
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| CN (1) | CN202424162U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052019A (en) * | 2014-05-30 | 2014-09-17 | 安徽三和电力技术有限公司 | Arc extinction, resonance elimination and overvoltage protection device |
| CN104518506A (en) * | 2014-11-24 | 2015-04-15 | 安徽泰瑞通达机电设备有限公司 | Arc suppresser allowing distinguishing of intra-station arc grounding, extra-station grounding and motor stator arc grounding |
| 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 |
| CN104868462A (en) * | 2015-06-01 | 2015-08-26 | 安徽禄讯电子科技有限公司 | Microcomputer arc-extinguishing, harmonic-eliminating and overvoltage-protecting device |
| CN106230621A (en) * | 2016-07-22 | 2016-12-14 | 安徽亚辉电气自动化有限公司 | A kind of monitoring analysis system based on overvoltage protection device |
| CN107727990A (en) * | 2017-10-23 | 2018-02-23 | 云南电网有限责任公司电力科学研究院 | A kind of distribution arc grounding fault identification method |
| CN113791344A (en) * | 2021-11-17 | 2021-12-14 | 西安西电高压开关有限责任公司 | Switching test loop and method for switching current of high-voltage isolating switch |
-
2011
- 2011-11-16 CN CN2011204540227U patent/CN202424162U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052019A (en) * | 2014-05-30 | 2014-09-17 | 安徽三和电力技术有限公司 | Arc extinction, resonance elimination and overvoltage protection device |
| CN104518506A (en) * | 2014-11-24 | 2015-04-15 | 安徽泰瑞通达机电设备有限公司 | Arc suppresser allowing distinguishing of intra-station arc grounding, extra-station grounding and motor stator arc grounding |
| 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 |
| CN104868462A (en) * | 2015-06-01 | 2015-08-26 | 安徽禄讯电子科技有限公司 | Microcomputer arc-extinguishing, harmonic-eliminating and overvoltage-protecting device |
| CN106230621A (en) * | 2016-07-22 | 2016-12-14 | 安徽亚辉电气自动化有限公司 | A kind of monitoring analysis system based on overvoltage protection device |
| CN107727990A (en) * | 2017-10-23 | 2018-02-23 | 云南电网有限责任公司电力科学研究院 | A kind of distribution arc grounding fault identification method |
| CN113791344A (en) * | 2021-11-17 | 2021-12-14 | 西安西电高压开关有限责任公司 | Switching test loop and method for switching current of high-voltage isolating switch |
| CN113791344B (en) * | 2021-11-17 | 2022-06-28 | 西安西电高压开关有限责任公司 | Switching test loop and method for switching current of high-voltage isolating switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20120905 Termination date: 20151116 |