CN1793997A - Automatic tuning and small current grounding failure wire selection system of 8421 parallel reactor composite extinction coil - Google Patents
Automatic tuning and small current grounding failure wire selection system of 8421 parallel reactor composite extinction coil Download PDFInfo
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- CN1793997A CN1793997A CN 200510130052 CN200510130052A CN1793997A CN 1793997 A CN1793997 A CN 1793997A CN 200510130052 CN200510130052 CN 200510130052 CN 200510130052 A CN200510130052 A CN 200510130052A CN 1793997 A CN1793997 A CN 1793997A
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Abstract
A line selecting system for automatic tuning if arc quenching coil in 8421 parallel reactor integrated type and earthing fault of small current includes is prepared as forming said system by five reactors with one being used always as basic volume and the other four being used in rated value, connecting each of said four reactors to a vacuum high voltage contactor to form sixteen uniform volume of reactor, operating system on over - compensation mode with said four reactors on operation and operating system on full - compensation mode to ensure arc quenching by switching on or off reactor in optimum way when single phase earthing fault is existed on system.
Description
Technical 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 8421 shunt reactor combined type arc suppression coils.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 8421 parallel reactance combined type arc-extinguishing coil automatic tuning and small current grounding failure wire selection systems are provided, specifically comprise: 1. primary equipment comprises and adopts 8421 shunt reactor combined type arc suppression coils; 2. secondary device comprises data acquisition and route selection control device.
Characteristics of the present invention are:
(1) arc suppression coil is formed (can increase as required) by five shunt reactors, wherein a reactor is as basic capacity, all the time input coefficient, the reactive capability of other four reactors was in 1: 2: 4: 8 ratio is distributed, every reactor connecting system of connecting with a vacuum high-pressure contactor 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.
Four equal input coefficients of reactor when (2) normally moving, system operates in the over-compensation mode, prevents resonance overvoltage away from tuning-points.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) compare with conventional turn-adjusting arc suppression coil, saved load ratio bridging switch, damping resistance and supporting with it fling-cut switch; The two is identical for the capacity summation of reactor; Many 4 vacuum high-pressure contactors.Cost obviously reduces.
(7) 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.
(8) every reactor is equipped with a Zinc-Oxide Arrester, has eliminated the superpotential that belt current excision reactor produces.
Description of drawings:
Fig. 1 is 8421 shunt reactor combined type arc suppression coil primary equipment structural drawing;
Fig. 2 is 8421 shunt reactor combined type arc suppression coil secondary devices, i.e. data acquisition and route selection control device schematic diagram;
Fig. 3 is 8421 shunt reactor combined type arc-extinguishing coil automatic tunings and route selection program flow diagram.
Embodiment:
8421 shunt reactor combined type arc suppression coil primary equipment structures as shown in Figure 1.L, L1, L2, L3, L4 are five shunt reactors, and the L reactor is as basic capacity, input coefficient all the time, and the reactive capability of L1, L2, L3, four reactors of L4 was in 1: 2: 4 in addition: 8 ratio is distributed.K1, k2, k3, k4 are the vacuum high-pressure contactor, and the connecting system of connecting with reactor respectively like this can be by operation realizes the switching of reactor is controlled to the vacuum high-pressure contactor, and b1, b2, b3, b4 are four lightning arresters.Four reactors have 16 kinds of array modes, can form 16 grades of equally distributed reactor capacity.
When system normally moves, four vacuum high-pressure contactor closures, reactor all puts into operation, and system operates in the over-compensation mode, prevents resonance overvoltage away from tuning-points.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.
Because inductive current can not suddenly change, so might produce superpotential in the process of switching reactor.B1, b2, b3, b4 are lightning arrester among the figure, play over-voltage.
Shunt reactor combined type arc suppression 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, sends the DO signal to the DO card by isa bus on the other hand, and the DO signal is sent the switching value signal through photoelectricity isolation drive relay, the action of control vacuum high-pressure contactor, or carry 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 to carry out tuning calculating, then enter the tuning algorithm flow process, calculate system's capacitive earth current, and obtain best reactor 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 the reactor best of breed scheme that calculates according to autotuning algorithm is controlled the vacuum high-pressure contactor, 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 (5)
1.8421 shunt reactor combined type arc-extinguishing coil automatic tuning and small current grounding failure wire selection system comprise:
Primary equipment comprises 8421 shunt reactor combined type arc suppression coils;
Secondary device comprises data acquisition and route selection control device;
It is characterized in that:
(1) arc suppression coil is made up of at least five shunt reactors, wherein a reactor is as basic capacity, all the time input coefficient, the reactive capability of other four reactors was in 1: 2: 4: 8 ratio is distributed, every reactor connecting system of connecting with a vacuum high-pressure contactor is used for reactor is carried out switching control;
(2) described data acquisition and route selection control device comprise:
CPU, four equal input coefficients of reactor of control make system operate in over-compensation 15% mode when being used for normally moving, and prevent resonance overvoltage away from tuning-points;
Data collecting card is used for real-time image data;
Isa bus; Be used for data are sent to described CPU, calculate the earthing capacitance current of system and the optimum composition method of shunt reactor by CPU;
Wherein, according to optimum composition method switching reactor, system operates in full compensation way, guarantees reliable blow-out when singlephase earth fault takes place; With
When single-phase permanent earth took place, described data acquisition and route selection control device adopted the jump-value of current method to carry out correct route selection.
2. system as claimed in claim 1, wherein every described reactor is equipped with a Zinc-Oxide Arrester, is used to eliminate the superpotential that belt current excision reactor produces.
3. system as claimed in claim 1, wherein said four reactors have 16 kinds of array modes, can form 16 grades of equally distributed reactor capacity.
4. system as claimed in 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.
5. system as claimed in 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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| CNB2005101300521A CN100390552C (en) | 2005-12-12 | 2005-12-12 | Automatic tuning and small current grounding failure wire selection system of 8421 parallel reactor composite extinction coil |
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| CNB2005101300521A CN100390552C (en) | 2005-12-12 | 2005-12-12 | Automatic tuning and small current grounding failure wire selection system of 8421 parallel reactor composite extinction coil |
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| CN1793997A true CN1793997A (en) | 2006-06-28 |
| CN100390552C CN100390552C (en) | 2008-05-28 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107681646A (en) * | 2017-10-27 | 2018-02-09 | 国网河南省电力公司漯河供电公司 | It is a kind of to be used for guard method of the arc suppression coil under chopping current |
| CN109004628A (en) * | 2018-07-26 | 2018-12-14 | 国网黑龙江省电力有限公司伊春供电公司 | Protect collocation structure and the guard method of shunt reactor equipment and system safety |
| CN110445115A (en) * | 2019-07-03 | 2019-11-12 | 中山职业技术学院 | A kind of more arc suppression coil auto parallel Connection fuzzy control methods |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| HUP0900619A2 (en) * | 2009-09-30 | 2011-12-28 | Protecta Elektronikai Kft | Protecting method and device for three-phase electric power networks |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2366954Y (en) * | 1998-09-22 | 2000-03-01 | 福建省电力勘测设计院 | Variable reactor |
| CN2605579Y (en) * | 2003-02-26 | 2004-03-03 | 罗明览 | Single-phase grounding compensation detectnig apparatus |
| CN2666009Y (en) * | 2003-10-30 | 2004-12-22 | 乐山-拉得电网自动化有限公司 | Automatic tuning protection device |
-
2005
- 2005-12-12 CN CNB2005101300521A patent/CN100390552C/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107681646A (en) * | 2017-10-27 | 2018-02-09 | 国网河南省电力公司漯河供电公司 | It is a kind of to be used for guard method of the arc suppression coil under chopping current |
| CN109004628A (en) * | 2018-07-26 | 2018-12-14 | 国网黑龙江省电力有限公司伊春供电公司 | Protect collocation structure and the guard method of shunt reactor equipment and system safety |
| CN110445115A (en) * | 2019-07-03 | 2019-11-12 | 中山职业技术学院 | A kind of more arc suppression coil auto parallel Connection fuzzy control methods |
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| CN100390552C (en) | 2008-05-28 |
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Denomination of invention: Automatic tuning and small current grounding failure wire selection system of 8421 parallel reactor composite extinction coil Effective date of registration: 20120706 Granted publication date: 20080528 Pledgee: Zhongguancun Beijing science and technology Company limited by guarantee Pledgor: Beijing Danhua Haobo Electricity Technology Co., Ltd. Registration number: 2012990000353 |
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Date of cancellation: 20130802 Granted publication date: 20080528 Pledgee: Zhongguancun Beijing technology financing Company limited by guarantee Pledgor: Beijing Danhua Haobo Electricity Technology Co., Ltd. Registration number: 2012990000353 |
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Change date: 20130802 Registration number: 2012990000353 Pledgee after: Zhongguancun Beijing technology financing Company limited by guarantee Pledgee before: Zhongguancun Beijing science and technology Company limited by guarantee |