CN201260077Y - Arc extinguishing device grounded through high frequency damp element - Google Patents
Arc extinguishing device grounded through high frequency damp element Download PDFInfo
- Publication number
- CN201260077Y CN201260077Y CNU2008200417908U CN200820041790U CN201260077Y CN 201260077 Y CN201260077 Y CN 201260077Y CN U2008200417908 U CNU2008200417908 U CN U2008200417908U CN 200820041790 U CN200820041790 U CN 200820041790U CN 201260077 Y CN201260077 Y CN 201260077Y
- Authority
- CN
- China
- Prior art keywords
- phase
- current
- voltage
- arc
- damping element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
Disclosed is an arc extinguishing device grounded by a high-frequency damping element, compared with the existing arc extinguishing device, the arc extinguishing device comprises a high voltage isolating switch, a high voltage current-limiting fuse, a three-phase voltage transformer, a three-phase overvoltage protector, a phase controlled vacuum contactor and a generator zero sequence current transformer, and also includes: a charged-current input intelligent controller, a high-frequency damping element and an earth current transformer. One end of the high-frequency damping element is connected with a phase splitting controller, and the other end thereof is connected to ground, and the earth current transformer converts capacitance current flowing across the high-frequency damping element into current signals that are input to the intelligent controller for data processing and being recorded and stored for facilitating accident analysis. The utility model reduces the probability of fuse failure, and solves the problem of select action of an arc extinguishing cabinet when single-phase arc grounding takes place in active equipment such as generators, the system capacitance current can be accurately recorded after the action, thereby providing accident analysis data.
Description
Technical field
The utility model belongs to the technical field of relay protection of power equipment, is specifically related to a kind of arc-extinction device by high frequency damping element ground connection.
Background technology
Existing technology status: neutral point non-direct grounding system, forming the superpotential basis of arc grounding is intermittent electric arc.When neutral point non-direct grounding system generation single phase intermittent arc grounding (hereinafter to be referred as " arc grounding ") fault, because electric arc repeatedly constantly extinguishes and restrikes, cause the repeatedly constantly accumulation and reallocation again of electric charge on system's direct-to-ground capacitance, on the inductance-capacitor loop of non-fault phase, cause higher-order of oscillation overvoltage.For overhead transmission line, the overvoltage amplitude generally can reach 3.1～3.5 times of phase voltages.Improve greatly based on the power supply network insulation breakdown of cable line or the possibility of electric arc high-frequency current zero crossing arc extinction, during the cable line arc grounding, the overvoltage of non-fault phase can reach 4～71 times.
The overvoltage of high amplitude has been aggravated the accumulation destruction of solid insulations such as cable, and the arc grounding overvoltage also will cause burning voltage transformer or fuse melting simultaneously, and even more serious will cause Explosion of on Arrester.
What solution arc grounding problem adopted in early time is to change the system neutral earthing mode, utilizes low resistance grounding, sacrifices power supply reliability and solves arc grounding; Developed into afterwards and adopted the arc suppression coil principle, utilize the voltage-current characteristic of inductance and electric capacity different, adopt inductive current to come the building-out capacitor electric current, because arc grounding is a high frequency content, so the arc suppression coil by the power frequency design can't compensate high-frequency current, opposite because the access of coil also will produce many side effects, such as: route selection is inaccurate, be easy to generate resonance, transmit overvoltage or the like.
In view of above analysis, adopting many elimination arc grounding products at present still is extinguishing arc and overvoltage protection cabinet.But device mainly is made up of high-pressure vacuum contactor, microcomputerized controller, the high-voltage and current-limitation fuse assembly of three phase combined over-voltage protector phase-splitting control and the voltage transformer pt etc. that has an auxiliary secondary winding.In case single-phase arc grounding takes place in system, discriminating fault types is with separate and send action command to fault vacuum contactor mutually immediately for microcomputerized controller, and vacuum contactor changes arc grounding into metal ground connection fast mutually.
The weak point that existing product exists: 1; because this product causes two relative ground circuits when preventing that other two-phase has certain mutually ground connection to be taken place again behind the device action; device adopts high-voltage and current-limitation fuse to protect in support; because the selection of high-tension fuse design is the capacitance current selection during by the Single Phase Metal ground connection the power frequency state under; and device is to move when system's generation arc grounding; this time, system existed powerful high frequency voltage and electric current; if do not add a high frequency damping element; to there be a very big high-frequency percussion electric current to flow through high-voltage and current-limitation fuse the instantaneous of combined floodgate; cause fuse blows; fuse in this case belongs to improper fusing, so this series products causes fuse blows behind the frequent generating means regular event when moving at the scene.2, this device only is to judge to be arc grounding by system voltage, therefore can't distinguish active device generation arc grounding, during such as high-voltage power machine stator arc grounding,, form short circuit if device action will cause 2 of different potentials by short circuit.So the system at the band house generator can't use this product.3, because device is not introduced electric current as Rule of judgment, return if therefore behind device action, move, device can't be noted the system capacitive current when moving at that time, brings difficulty for operation and accident analysis.
The utility model content
The purpose of this utility model is to solve following three problems: 1, solve the vacuum contactor instantaneous high-frequency percussion electric current that closes a floodgate and cause the problem of high-tension fuse fusing easily; 2, introduce current signal as important criterion, in device, design high-voltage generator 100% stator ground fault protection logic, on same program, realize the cooperation of two kinds of logics, like this can 100% realize that the logic of action cooperates.3, with system capacitive current signal introducing device, when realizing action signal record is got off, be convenient to accident analysis.
Technical solution of the present utility model is as follows:
Arc-extinction device by high frequency damping element ground connection comprises: vacuum contactor 5, the generator zero sequence current mutual inductor 8 of high voltage isolator 1, high-voltage and current-limitation fuse 2, threephase potential transformer 3, three-phase overvoltage protection device 4, phase-splitting control, arc-extinction device by high frequency damping element ground connection also comprises intelligent controller 6, high frequency damping element 7 and earth current instrument transformer 9;
Connection lead between phase-splitting control vacuum contactor 2 and the high frequency damping element 7 passes high frequency damping element 7 other end ground connection from earth current instrument transformer 9 centers;
High-pressure vacuum contactor 5 other ends of phase-splitting control are connected with high-voltage and current-limitation fuse 2 one ends; Phase-splitting high-pressure vacuum contactor 5 is normal opening structure; High-voltage and current-limitation safety fuse 2 other ends are connected with three-phase bus;
High voltage isolator 1 one ends are connected with three-phase bus, and high voltage isolator 1 is normal opening structure;
Three-phase overvoltage protection device 4 is connected between three-phase bus and the ground;
The output of earth current instrument transformer 9 is connected with intelligent controller 6;
Three-phase bus is passed by generator zero sequence current mutual inductor 8 centers, and the output signal electric current I 0 of generator zero sequence current mutual inductor 8 inserts intelligent controller 6;
Voltage transformer 3 is used to detect three-phase bus and residual voltage, and its output voltage signal Ua, Ub, Uc, U0 insert intelligent controller 6;
Intelligent controller 6 comprises signal processing unit, arithmetic logic unit, performance element, the input of signal processing unit is connected with the input voltage and input current signal respectively, the output of signal processing unit is connected with arithmetic logic unit, the output of arithmetic logic unit is connected with performance element, and the performance element output is connected with the control coil of the high-pressure vacuum contactor 5 of phase-splitting control; Signal processing unit carries out data processing and record storage to input signal under the software support;
The data processing unit of intelligent controller 6 and arithmetic logic unit all adopt 32 bit DSP microprocessors.
The device quick acting is converted into high frequency damping ground connection with arc grounding during system generation arc grounding.
Good effect of the present utility model is:
Fusing probability when 1, having reduced regular event;
2, solve when active equipment such as generator is inner, and single-phase arc grounding takes place the selection action of arc extinction cabinet.
3, with system capacitive current signal introducing device, when realizing action signal record is got off, be convenient to accident analysis.
Description of drawings
Fig. 1 is existing extinguishing arc and over-pressure safety device;
Fig. 2 is the utility model extinguishing arc and overvoltage protection;
Fig. 3 is the utility model intelligent controller principle block diagram.
Specific embodiments
Below in conjunction with Figure of description the utility model is described further
Arc-extinction device by high frequency damping element ground connection comprises: vacuum contactor 5, the generator zero sequence current mutual inductor 8 of high voltage isolator 1, high-voltage and current-limitation fuse 2, threephase potential transformer 3, three-phase overvoltage protection device 4, phase-splitting control, arc-extinction device by high frequency damping element ground connection also comprises intelligent controller 6, high frequency damping element 7 and earth current instrument transformer 9;
Connection lead between phase-splitting control vacuum contactor 2 and the high frequency damping element 7 passes high frequency damping element 7 other end ground connection from earth current instrument transformer 9 centers;
High-pressure vacuum contactor 5 other ends of phase-splitting control are connected with high-voltage and current-limitation fuse 2 one ends; Phase-splitting high-pressure vacuum contactor 5 is normal opening structure; High-voltage and current-limitation safety fuse 2 other ends are connected with three-phase bus;
High voltage isolator 1 one ends are connected with three-phase bus, and high voltage isolator 1 is normal opening structure;
Three-phase overvoltage protection device 4 is connected between three-phase bus and the ground;
The output of earth current instrument transformer 9 is connected with intelligent controller 6;
Three-phase bus is passed by generator zero sequence current mutual inductor 8 centers, and the output signal electric current I 0 of generator zero sequence current mutual inductor 8 inserts intelligent controller 6;
Voltage transformer 3 is used to detect three-phase bus and residual voltage, and its output voltage signal Ua, Ub, Uc, U0 insert intelligent controller 6;
Intelligent controller 6 comprises signal processing unit, arithmetic logic unit, performance element, the input of signal processing unit is connected with the input voltage and input current signal respectively, the output of signal processing unit is connected with arithmetic logic unit, the output of arithmetic logic unit is connected with performance element, and the performance element output is connected with the control coil of the high-pressure vacuum contactor 5 of phase-splitting control; Signal processing unit carries out data processing and record storage to input signal under the software support;
The data processing unit of intelligent controller 6 and arithmetic logic unit all adopt 32 bit DSP microprocessors.
Fig. 1 is existing extinguishing arc and overvoltage protection; what adopt is to be converted into metal ground connection principle; and whole device is not gathered any current signal; course of action is: when device detects arc grounding; controller closes a floodgate the vacuum contactor of corresponding phase fast; arc grounding is converted into metal ground connection; because contactor combined floodgate instantaneous system is in the arc grounding state; system will produce the high frequency capacitance electric current and be far longer than the power frequency capacitance current; and the high-tension fuse parameter of device is by the design of power frequency capacitive earth current, so be difficult to guarantee that fuse does not fuse under this high-frequency current impacts.Therefore the fuse failure phenomenon often takes place in this class arc-extinction device.
Situation when also having us to analyze on Fig. 1 A point and B point generation arc grounding, as can be seen from Figure 1, when A point and B point generation ground connection, without any difference.Again as can be seen from Figure 3, whole arc-suppressing controller does not have the current acquisition element, and for the arc-extinction device of only using voltage as criterion, device all moves no matter the A point still is B point generation arc grounding.
Result after the action: as can be seen from Figure 1, the earth point C point after the action of A point and arc-extinction device is equipotential, at this moment utilize arc-extinction device with A point arc light ground connection be converted into metal ground connection to system without any harm, can not form circulation.See the B point again; the earth point C point of B point and arc-extinction device is not an equipotential; if arc grounding takes place in the B point; arc-extinction device moves again; to form different potentials B point and C point so at two by short circuit; to produce very big circulation this time, and generator unit stator is produced very big short-circuit impact, and the backup protection fuse of arc extinction cabinet also will fuse simultaneously.
Existing many producers do not take any measure for above this problem, also there is part producer to adopt the closedown mode of Fig. 1: zero-sequence current is passed through a zero sequence current mutual inductor, contact introducing device with instrument transformer carries out locking then, as if this mode reasonable from principle, can find that this scheme can't realize but anatomize, because the operate time of extinguishing arc is about 40ms, and need 100ms at least by zero phase-sequence relay, this does not also comprise the processing time after device receives relay signal, so this scheme can't realize reliable fit.
As can be seen from Figure 1, earth current is directly introduced ammeter, and device action recovers after-current and disappears, and can't note.
Fig. 2 is novel patent extinguishing arc and overvoltage protection; what adopt is by high frequency damping element ground connection principle; the high frequency damping element closes a floodgate instantaneous at contactor; high-frequency signal is played certain damping action; reduce the probability of fuse blows; simultaneously the high frequency damping element is lower to the impedance of power frequency component, does not influence the system's operation under the stable state behind the device action.The damping element setting is similar to the R-L protector; with resistance R be serially connected with after iron-core inductance L is in parallel vacuum contactor and and ground between; pulsactor value just often unshakable in one's determination is less, and pressure drop and loss are all very low, does not influence the operation of system under stable state behind the device action.When the arc reignition vibration took place, high-frequency current increased reactance unshakable in one's determination, suppresses overvoltage, and resistance then plays damping and metering function, guaranteed that the high-frequency percussion electric current does not return to cause fuse blows.
Solving on the generator stator ground problem, as can be seen from Figure 2, device is directly directly introduced intelligent arc-suppressing controller with the generator zero-sequence current, Fig. 3 is the structured flowchart of novel arc-suppressing controller, from the figure as can be seen, novel arc-suppressing controller is introduced the input of 6 road electric currents simultaneously not only with three-phase voltage and residual voltage introducing device.Three-phase voltage like this; residual voltage also has zero-sequence current all to introduce intelligent arc-suppressing controller; be easy to once cover generator 100% stator ground fault protection in the design of arc-suppressing controller the inside like this; this generator protection for earthing program is embedded in the arc grounding defence program; call with same DSP by a main program and to control; like this; can accurately judge at A point and B point ground connection arc-suppressing controller; at A point arc light earthing device action message; in the reliable locking of B point earthing device, can accomplish 100% reliable fit.
As can be seen from Figure 2, earth current is directly introduced intelligent controller, and when device action, at that time system capacitive current under the instantaneous record is convenient to analyze.
Claims (2)
1, passes through the arc-extinction device of high frequency damping element ground connection, comprise: vacuum contactor (5), the generator zero sequence current mutual inductor (8) of high voltage isolator (1), high-voltage and current-limitation fuse (2), threephase potential transformer (3), three-phase overvoltage protection device (4), phase-splitting control, it is characterized in that: the arc-extinction device by high frequency damping element ground connection also comprises intelligent controller (6), high frequency damping element (7) and earth current instrument transformer (9);
Connection lead between phase-splitting control vacuum contactor (2) and the high frequency damping element (7) passes high frequency damping element (7) other end ground connection from earth current instrument transformer (9) center;
High-pressure vacuum contactor (5) other end of phase-splitting control is connected with high-voltage and current-limitation fuse (2) one ends; Phase-splitting high-pressure vacuum contactor (5) is normal opening structure; High-voltage and current-limitation safety fuse (2) other end is connected with three-phase bus;
High voltage isolator (1) one end is connected with three-phase bus, and high voltage isolator (1) is normal opening structure;
Three-phase overvoltage protection device (4) is connected between three-phase bus and the ground;
The output of earth current instrument transformer (9) is connected with intelligent controller (6);
Three-phase bus is passed by generator zero sequence current mutual inductor (8) center, and the output signal electric current I 0 of generator zero sequence current mutual inductor (8) inserts intelligent controller (6);
Voltage transformer (3) is used to detect three-phase bus voltage, its output voltage signal Ua, and Ub, Uc, U0 inserts intelligent controller (6);
Intelligent controller (6) comprises signal processing unit, arithmetic logic unit, performance element, the input of signal processing unit is connected with the input voltage and input current signal respectively, the output of signal processing unit is connected with arithmetic logic unit, the output of arithmetic logic unit is connected with performance element, and the performance element output is connected with the control coil of the high-pressure vacuum contactor (5) of phase-splitting control; Signal processing unit carries out data processing and record storage to input signal under the software support.
2, the arc-extinction device by high frequency group Buddhist nun element ground connection according to claim 1, it is characterized in that: the data processing unit and the arithmetic logic unit of intelligent controller (6) all can be handled 6 road current signals, and microprocessor adopts 32 bit DSPs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200417908U CN201260077Y (en) | 2008-09-03 | 2008-09-03 | Arc extinguishing device grounded through high frequency damp element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200417908U CN201260077Y (en) | 2008-09-03 | 2008-09-03 | Arc extinguishing device grounded through high frequency damp element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201260077Y true CN201260077Y (en) | 2009-06-17 |
Family
ID=40774314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200417908U Expired - Lifetime CN201260077Y (en) | 2008-09-03 | 2008-09-03 | Arc extinguishing device grounded through high frequency damp element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201260077Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290805A (en) * | 2011-08-12 | 2011-12-21 | 四川电器集团股份有限公司 | Electric arc grounding overvoltage limiting device applied to medium-voltage distribution system |
| 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 |
| CN107394763A (en) * | 2017-07-01 | 2017-11-24 | 合肥东玖电气有限公司 | A kind of electric wire netting arc extinguishing and overvoltage protection system |
-
2008
- 2008-09-03 CN CNU2008200417908U patent/CN201260077Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290805A (en) * | 2011-08-12 | 2011-12-21 | 四川电器集团股份有限公司 | Electric arc grounding overvoltage limiting device applied to medium-voltage distribution system |
| 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 |
| CN107394763A (en) * | 2017-07-01 | 2017-11-24 | 合肥东玖电气有限公司 | A kind of electric wire netting arc extinguishing and overvoltage protection system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105356441B (en) | The method and apparatus of intelligent PT harmonic eliminations phase selection | |
| CN101726692B (en) | Single-phase ground fault positioning method for ground protective device of low-current system | |
| CN101719660B (en) | Method for automatically resetting grounding protection device of small-current system | |
| CN101183788A (en) | Power network controlled reactance and small resistor combination type earthing device | |
| CN110389276A (en) | A kind of singlephase earth fault management system and method | |
| CN205544206U (en) | Intelligence PT harmonic elimination selects device of looks | |
| CN201138751Y (en) | Earthing set equipment combining power grid controllable reaction with small resistance | |
| CN213484514U (en) | Active intervention type arc suppression device for single-phase earth fault treatment | |
| CN108879645A (en) | A kind of arc suppression coil and pro-active intervention arc-extinction device paired running device and method | |
| CN202424162U (en) | Microcomputer arc and harmonic elimination and overvoltage protection device | |
| CN203278210U (en) | Busbar residual voltage maintaining device | |
| CN104518506A (en) | Arc suppresser allowing distinguishing of intra-station arc grounding, extra-station grounding and motor stator arc grounding | |
| CN2884641Y (en) | Overvoltage limit and small current earthing selective integrator of power transfer and distribution system | |
| CN201146387Y (en) | Arc-extinguishing cabinet | |
| CN201260077Y (en) | Arc extinguishing device grounded through high frequency damp element | |
| CN201008096Y (en) | Arc extinguishing compensation mechanism for neutral point non-effective earthing power network | |
| CN201004553Y (en) | Arc over voltage limit for power transmission and distribution system and integrated device for small current grounding and line selection | |
| CN203180508U (en) | System overvoltage inhibition apparatus | |
| CN102290805A (en) | Electric arc grounding overvoltage limiting device applied to medium-voltage distribution system | |
| CN202488131U (en) | Grounding conversion device for neutral points of power distribution network | |
| CN201887537U (en) | Arc extinguishing cabinet | |
| CN201774233U (en) | Novel protection device special for low voltage generator | |
| CN201562955U (en) | Small-current system grounding protection device with automatic reset function | |
| CN212210481U (en) | Distribution network initiative intervention type arc extinction device | |
| CN202696141U (en) | Arc-extinction resonance-elimination device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170407 Address after: 230001 Anhui science and technology zone, Hefei high tech Avenue, No. 168, science and Technology Industrial Park, building B-6, floor second Patentee after: Hefei Ruida Software Technology Co., Ltd. Address before: 230022 Anhui province Hefei city cooperation Road No. 1-703 city high heaven and earth Patentee before: Wei Fudao |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090617 |
|
| CX01 | Expiry of patent term |