CN100403041C - Automatic tuning and small current grounding failure wire selection system of master slave extinction coil - Google Patents
Automatic tuning and small current grounding failure wire selection system of master slave extinction coil Download PDFInfo
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- CN100403041C CN100403041C CNB2005101300517A CN200510130051A CN100403041C CN 100403041 C CN100403041 C CN 100403041C CN B2005101300517 A CNB2005101300517 A CN B2005101300517A CN 200510130051 A CN200510130051 A CN 200510130051A CN 100403041 C CN100403041 C CN 100403041C
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- 230000008033 biological extinction Effects 0.000 title claims description 13
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 3
- 230000001629 suppression Effects 0.000 claims description 35
- 238000013461 design Methods 0.000 claims description 2
- 230000009466 transformation Effects 0.000 claims description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims 2
- 239000002184 metal Substances 0.000 claims 1
- 229960001296 zinc oxide Drugs 0.000 claims 1
- 239000011787 zinc oxide Substances 0.000 claims 1
- 230000007935 neutral effect Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
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- 230000005622 photoelectricity Effects 0.000 description 1
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Abstract
The present invention belongs to an automatic tuning arc extinguishing coil used in the way that a neutral point of 3kV to 66kV of an electric network is grounded by an arc extinguishing coil and a line selection complete device. The arc extinguishing coil uses a master-slave type structures, a master arc extinguishing coil is preset in the mode of 15% of over compensation when a system runs normally, and the slave arc extinguishing coil is composed of four reactors, wherein the reactive capability of the four reactors is dispensed in the proportion of 1/2/4/8; each reactor and a vacuum high voltage contact or are connected in parallel to the system so as to control the reactors in a switch way. The slave arc extinguishing coil has 16 combination modes so as to form 16 gears if evenly distributed reactor capacity. At the time of normal running, the slave arc extinguishing coil retreats the system, and the system runs in the mode of over compensation. When the system is in the fault of single-phase grounding, a line selection controller is input the slave arc extinguishing coil in the optimum combination mode, and the system runs in the mode of full compensation so as to guarantee reliable arc extinguishing. If the condition of single-phase permanently grounding occurs, the line selection controller correctly selects lines by suing a current abrupt change method. The state information of the arc extinguishing coil and the result information of line selection are displayed on a liquid crystal screen, and are simultaneously sent to an integrated automation background of a substation by hard nodes or serial ports.
Description
Affiliated field:
The present invention is mainly used in 66kV and following neutral point of electric network in arc suppression coil earthing system, when electrical network generation single-phase earthing, this system can be automatically extinguish arcs and select earth fault line automatically fast.
Technical background:
Past 3～66kV electric system adopts the isolated neutral mode usually, in recent years along with expanding economy, the expansion of electric system scale, the increase of line length and power cable line increases, extends in the system, the capacitive earth current of electrical network is risen significantly, the capacitance current value is increasing, and the capacitance current of many systems reaches more than the 50A.When neutral point ungrounded electric net work generation singlephase earth fault, the effectively blow-out of trouble spot electric arc, electric arc promptly allows to extinguish automatically, also must be through the long time, fault is enlarged form disconnection fault or permanent earth fault, more seriously develop into the major accident of phase fault; Increasing instantaneous singlephase earth fault can not be eliminated automatically, the intermittent arc grounding superpotential frequently occurs, weak insulator arrangement in the system is constituted a threat to, accidents such as easy generation systems cable is blown out, the blast of switch insulation, the safe operation of system in serious threat.
Arc suppression coil is installed is guaranteed the fast and reliable blow-out, thereby rules regulation, when the ground current of electric network single-phase earth fault surpasses certain value, just arc suppression coil must be installed extinguishes automatically fast to impel ground arc, prevent that fault from further enlarging, guarantee safety, the reliability service of electric system, this tallies with the national condition.
Domestic priority is developed multiple arc suppression coil since nearly ten years, comprises turn-adjusting, adjusting gapped-core type, magnetic biasing type, secondary side induction-regulated, secondary side capacitor tuning type etc.Though having done to improve in some aspects, improve these arc suppression coils, but simultaneously also and depositing certain problem, what for example domestic use was maximum is automatic turn-adjusting arc suppression coil, but owing to exist each gear inductance value to have big difference, response speed is slow, can not operate in shortcomings such as full compensation point, the extinguishing arc effect is relatively poor.Other arc suppression coils also exist complex structure, generation harmonic wave and cost than problems such as height.In addition, the route selection problem of permanent earth fault does not obtain fine solution so far.
Therefore optimizing the resonance grounding technology still has very big development space, and we also invent this patented technology just under such technical background.
Summary of the invention:
In order to overcome the deficiency of existing arc suppression coil, we have invented master slave extinction coil.Our this invention will solve three problems that present resonant earthed system exists: 1. system's residual flow is big; 2. blow-out is slow; 3. route selection accuracy is low, nearly one-step optimization resonance grounding technology.
The technical solution used in the present invention is: a kind of master slave extinction coil hands-off tuning and small current grounding failure wire selection system are provided, specifically comprise: 1. primary equipment comprises main arc suppression coil, load ratio bridging switch, from arc suppression coil and high-pressure vacuum contactor; 2. secondary device comprises data acquisition and route selection control device.
Characteristics of the present invention are:
(1) be made up of four reactors from arc suppression coil, the reactive capability of four reactors was in 1: 2: 4: 8 ratio is distributed, and an every reactor and a vacuum high-pressure contactor connecting system in parallel can carry out switching control to reactor like this.Four reactors have 16 kinds of array modes, can form 16 grades of equally distributed reactor capacity.
(2) adopt primary and secondary structure, advantage that will " preset " and " with accent " combines, and logs off from arc suppression coil when normally moving, and system operates in over-compensation 15% mode.The real-time image data of route selection controller calculates the earthing capacitance current of system and the optimum composition method of shunt reactor.
(3) the route selection controller is according to optimum composition method switching reactor when system's generation singlephase earth fault, and system operates in full compensation way, guarantees reliable blow-out.
(4) if single-phase permanent earth takes place, controller can adopt the jump-value of current method to carry out correct route selection.
(5) arc suppression coil status information and route selection object information can show in LCD screen, can send to integrated automation of transformation stations backstage by rhabdion point or serial ports simultaneously.
(6) realized that route selection and extinguishing arc are integrated, utilized prominent quantity method route selection, the route selection accuracy reaches 100%, has thoroughly solved a neutral by arc extinction coil grounding system route selection difficult problem.
(7) do not need frequently to adjust shunting switch, change the variation that realizes from the motion tracking capacitance current by switching from arc suppression coil.
(8) do not need easy out of order damping resistance, guaranteed the safety of system.
Description of drawings
Fig. 1 is the structural drawing of master slave extinction coil primary equipment;
Fig. 2 is the master slave extinction coil secondary device, i.e. data acquisition and route selection control device schematic diagram;
Fig. 3 is master slave extinction coil hands-off tuning and route selection program flow diagram.
Embodiment:
The master slave extinction coil structure as shown in Figure 1.L1, L2, L3, L4 are four shunt reactors, and the reactive capability of four reactors was in 1: 2: 4: 8 ratio is distributed.K1, k2, k3, k4 are the vacuum high-pressure contactor, and connecting system in parallel with reactor respectively like this can be by operation realizes the switching of reactor is controlled to the vacuum high-pressure contactor.Four reactors have 16 kinds of array modes, can form 16 grades of equally distributed reactor capacity.From the design of each reactor of arc suppression coil is (if 2 from arc suppression coil, then ground current is less than 2A) that carries out less than the principle of 1A according to the ground current that makes after the compensation, and such gear distributes and satisfies tuning needed precision.
Arc suppression coil adopts primary and secondary structure, and master's arc suppression coil was being mended 15% mode excessively in system's operation preset just often when system normally moved, and four vacuum high-pressure contactor closures log off from arc suppression coil.After singlephase earth fault took place, from arc suppression coil, system operated in full compensation way to controller according to the optimum composition method input, guarantees reliable blow-out.
The master slave extinction coil secondary device, i.e. data acquisition and route selection control device principle are as shown in Figure 2.This data acquisition and route selection control device are controlled this shunt reactor combined type arc suppression coil comprehensively, and its CPU calls real time data and carries out hands-off tuning from isa bus, in real time controls such as monitoring and route selection computing.This device partly is made up of mainboard (comprising CPU, internal memory), active low-pass filter integrated circuit board, A/D sampling card, DO card, relay integrated circuit board, voltage current transducer integrated circuit board, power of alterating and direct current, liquid crystal giant-screen, modulator-demodular unit, hard disk etc.Bus residual voltage, each bar circuit zero-sequence current, arc suppression coil voltage and arc suppression coil electric current are received on the terminal row of device rear panel, adopt high-precision miniature voltage current transducer that secondary current, the voltage signal unification of each passage are transformed to low voltage signal.Voltage signal carries out filtering by a preposition active low-pass filter, has effectively removed various high frequency interference, and this helps handling for our programmed algorithm greatly.Be converted to digital signal through filtered simulating signal through A/D sampling card, deliver on the isa bus of industrial computer, industrial control computer mainboard CPU calls real time data and carries out hands-off tuning and the route selection computing from isa bus.Result of calculation directly shows by LCD screen on the one hand, send the DO signal to the DO card by isa bus on the other hand, the DO signal is sent the switching value signal through photoelectricity isolation drive relay, drives load ratio bridging switch and four vacuum high-pressure contactor actions, or carries out fault alarm.Device is furnished with RS232 serial ports and Modem communication mode simultaneously, and it is mutual to make the device and the external world carry out teledata.
Except voltage current transducer integrated circuit board, active low-pass filter integrated circuit board and relay integrated circuit board, other device (comprising isa bus) all is standardized card for industrial computer, and is easily assembled based on the line selection apparatus of industrial computer; Because the industrial computer memory size is big, therefore can carries out complex mathematical and calculate.Device utilizes big capacity hard disk can carry out mass data storage, and every table apparatus can be stored the fault waveform data more than 100,000.Device also is equipped with anti-deadlock watchdog circuit, has prevented the deadlock problem after industrial computer is subjected to strong the interference effectively.
Hands-off tuning and route selection program circuit are as shown in Figure 3.Master routine is made up of three threads, first thread is the hands-off tuning thread, program is gathered the arc suppression coil voltage and current in real time, and judge whether that according to image data needs carry out tuning calculating, as think and need carry out tuning calculating, then enter the tuning algorithm flow process, calculate system's capacitive earth current, the control load ratio bridging switch makes main arc suppression coil be adjusted to the state of over-compensation 15%, and obtains best from the arc suppression coil assembled scheme.Second thread is the self check thread, and self-check program is regularly judged arc suppression coil, and whether ground connection is good, and whether each vacuum high-pressure contactor breaks down etc., then reports to the police immediately as finding fault.The 3rd thread is the failure line selection thread, program is gathered the residual voltage of bus zero-sequence current and each bar circuit in real time, as find the out-of-limit route selection flow process that then enters immediately of residual voltage, at first control the vacuum high-pressure contactor from arc suppression coil best of breed scheme according to what autotuning algorithm calculated, make system be in full compensating coefficient, realize reliable blow-out.If fault does not disappear, illustrate that fault is the continuous earth fault, route selection this moment program utilizes multiple line selection algorithms such as jump-value of current method, quintuple harmonics method to carry out comprehensive route selection, and the route selection result exports by rhabdion point or serial ports.Postpone certain hour (for example 1 second) if the back fault does not disappear, then carry out route selection again, if fault disappears then controls the vacuum high-pressure contactor, make the equal input coefficient of all reactors, the system of assurance is in the over-compensation mode.Master routine guarantees that by setting interrupt priority level three threads do not clash.
Claims (7)
1. master slave extinction coil hands-off tuning and small current grounding failure wire selection system comprise:
Primary equipment comprises master slave extinction coil;
Secondary device comprises data acquisition and route selection control device;
It is characterized in that:
(1) described master slave extinction coil is composed in series by main arc suppression coil with from arc suppression coil;
(2) describedly be composed in series by four reactors from arc suppression coil, the reactive capability of four reactors was in 1: 2: 4: 8 ratio is distributed, an every reactor and a vacuum high-pressure contactor connecting system in parallel;
(3) described data acquisition and route selection control device comprise:
CPU, four reactors of control all log off when being used for normally moving, and make system operate in over-compensation 15% mode;
Data collecting card is used for real-time image data;
Isa bus is used for data are sent to described CPU, calculates the earthing capacitance current of system and the optimum composition method of shunt reactor by described CPU;
Wherein, according to optimum composition method switching reactor, system operated in full compensation way, guarantees reliable blow-out when singlephase earth fault took place; With and when single-phase permanent earth takes place, adopt the jump-value of current method to carry out correct route selection and wherein,
The tuning manner of this system combines for " preset " and " with transferring " formula.
2. system according to claim 1, wherein said four reactors have 16 kinds of array modes, can form 16 grades of equally distributed reactor capacity.
3. system according to claim 1, wherein said design from each reactor of arc suppression coil is according to the ground current after the compensation is carried out less than the principle of 1A.
4. system according to claim 1, wherein said from arc suppression coil employing vacuum high-pressure contactor switching reactor, every reactor is equipped with a Zinc-Oxide Arrester, is used to eliminate the superpotential that belt current excision reactor produces.
5. system according to claim 1 wherein saidly also can adopt electronic switch zero crossing switching reactor from arc suppression coil.
6. system according to claim 1, wherein arc suppression coil status information and route selection object information can show in LCD screen, can send to integrated automation of transformation stations backstage by rhabdion point or serial ports simultaneously.
7. system according to claim 1, wherein said data acquisition and route selection control device comprise: mainboard, wave filter card, data collecting card, switching value card, event attitude relay, PT/CT version, power of alterating and direct current, liquid crystal giant-screen, modulator-demodular unit, metal cabinet.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101300517A CN100403041C (en) | 2005-12-12 | 2005-12-12 | Automatic tuning and small current grounding failure wire selection system of master slave extinction coil |
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| CNB2005101300517A CN100403041C (en) | 2005-12-12 | 2005-12-12 | Automatic tuning and small current grounding failure wire selection system of master slave extinction coil |
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| CN1793996A CN1793996A (en) | 2006-06-28 |
| CN100403041C true CN100403041C (en) | 2008-07-16 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101719662B (en) * | 2009-11-06 | 2012-08-08 | 北京衡天北斗科技有限公司 | Fault line selection device for distribution line of small-current grounding system |
| CN108832609B (en) * | 2018-07-11 | 2019-08-27 | 云南电网有限责任公司电力科学研究院 | A method of singlephase earth fault is solved based on turn-adjusting arc-extinguishing winding |
| CN109142968B (en) * | 2018-07-18 | 2019-12-03 | 国网湖北省电力有限公司武汉供电公司 | A kind of fault line selection for indirectly grounding power system method compared based on stable status zero-sequence current |
| CN111864715A (en) * | 2020-07-21 | 2020-10-30 | 梁志瑞 | Normalization module combined arc suppression coil |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2296087Y (en) * | 1996-04-04 | 1998-10-28 | 李健生 | Automatic aligning arc blast device |
| CN2387653Y (en) * | 1999-07-29 | 2000-07-12 | 上海思源电气有限公司 | Arc-eliminating coil microcomputer auto-tuning and earthing line-selecting device |
| CN2438257Y (en) * | 2000-05-24 | 2001-07-04 | 顺德特种变压器厂 | Automatic tuning arc suppression oil earthing device |
| CN1136638C (en) * | 2000-05-23 | 2004-01-28 | 上海思源电气有限公司 | Total-state compensating arc-extinguishing coil automatic tuning device |
-
2005
- 2005-12-12 CN CNB2005101300517A patent/CN100403041C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2296087Y (en) * | 1996-04-04 | 1998-10-28 | 李健生 | Automatic aligning arc blast device |
| CN2387653Y (en) * | 1999-07-29 | 2000-07-12 | 上海思源电气有限公司 | Arc-eliminating coil microcomputer auto-tuning and earthing line-selecting device |
| CN1136638C (en) * | 2000-05-23 | 2004-01-28 | 上海思源电气有限公司 | Total-state compensating arc-extinguishing coil automatic tuning device |
| CN2438257Y (en) * | 2000-05-24 | 2001-07-04 | 顺德特种变压器厂 | Automatic tuning arc suppression oil earthing device |
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| CN1793996A (en) | 2006-06-28 |
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