CN204651898U - A kind of air core reactor turn-to-turn fault protective device - Google Patents
A kind of air core reactor turn-to-turn fault protective device Download PDFInfo
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- CN204651898U CN204651898U CN201520371112.8U CN201520371112U CN204651898U CN 204651898 U CN204651898 U CN 204651898U CN 201520371112 U CN201520371112 U CN 201520371112U CN 204651898 U CN204651898 U CN 204651898U
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Abstract
The utility model relates to electric power system Microcomputer Protection field; in particular to a kind of air core reactor turn-to-turn fault protective device; comprise low pressure induction coil, balancing transformer, Microcomputer Protection device; described low pressure induction coil is arranged on reactor bottom potential place; described balancing transformer is arranged on below low pressure induction coil, and described Microcomputer Protection device is arranged on reactor end.The utility model is shunt reactor, series connection current limiting reactor, filter reactor, the most frequently used inductor turn-to-turn fault protective devices such as capacitor current limiting reactor, and strong adaptability is respond well, is widely used.
Description
Technical field
The utility model relates to electric power system Microcomputer Protection field, particularly a kind of air core reactor turn-to-turn fault protective device and method thereof.
Background technology
Reactor is the indispensable power equipment of electric power system, is widely used in reactive power compensator, restriction impulse current or fault current, compensated line capacity current.Along with developing rapidly of China's power grid construction, the application of high pressure reactance is also more and more general.
At present, high voltage reactor generally adopts single-phase absolute construction, the pattern that high-capacity adopts single-phase 2 platform independent to install often; In addition, for effectively reducing accident scope, existing explicit stipulation (such as State Grid Corporation of China's " 18 great anti-accident measures of electrical network ") explicitly calls for new construction air core reactor according to flatwise layout, closed assembly should do not taked to place.Reactor Fault mainly contains: turn-to-turn short circuit, single-phase earthing.Turn-to-turn short circuit is Reactor Fault the most common; because its fault current is passing through property electric current, longitudinal difference protection lost efficacy, domestic also imperfect specially safeguard measure in addition; the overwhelming majority reactor all protection is not set, this to power system safety and stability run and unfavorable.If reactor breaks down, do not adopt and protect timely and effectively, reactor can reach fusing point in the short time to be caused and seriously burns, and even impacts other power equipments.According to relevant statistics, 1999 ~ 2003, nationwide integrated power grid high voltage reactor protection accuracy was only 27.27%, and these several years, Reactor Fault occurred again and again, and rose year by year.Current, the domestic research to reactor interturn protection achieves some achievements, proposes based on terminal voltage change, changed power, flux change, the achievement in research of variations in temperature.As a consequence of an irresistible cause, a lot of theoretical research is only in the laboratory proofing stage, and on-the-spot most reactor does not arrange effective protective device.
From practical operation situation, the domestic interturn protection device main bugbear configured is the determination to setting value, usually occurs malfunction, tripping, does not reach actual effect.
Given this, market has started special, the effective interturn protection device of requirement reactor configuration.So a whole set of detection scheme of current turn-to-turn short circuit in the urgent need to address, can, at fault initial stage Timeliness coverage, accident be avoided to expand further.
Summary of the invention
The utility model provides a kind of air core reactor turn-to-turn fault protective device and method thereof; by setting up protective device to scene operating reactance device, energy Real-Time Monitoring protection reactor internal operation situation, apparatus structure is simple; detection sensitivity is high, and operation is simple and feasible.
The technical solution of the utility model is as follows:
The utility model proposes a kind of air core reactor turn-to-turn fault protective device; it is characterized in that; comprise low pressure induction coil, balancing transformer, Microcomputer Protection device; described low pressure induction coil is arranged on reactor bottom potential place; described balancing transformer is arranged on below low pressure induction coil, and described Microcomputer Protection device is arranged on reactor end.
Described low pressure induction coil is three-phase induction coil, described low pressure induction coil utilizes number of ampere turns and the change thereof of the leakage flux indirect inspection air core reactor of air core reactor, air core reactor guard method induction coil adopts two kinds of modes of connection, dissimilar reactor can be protected, as both-end star-star connection current protection is applicable to filter reactor protection, open delta voltage method is applicable to the large-scale shunt reactor of protection; Described balancing transformer is for eliminating foozle and the alignment error of three-phase reactor; Described microcomputer protecting device is used for judging whether turn-to-turn fault occurs.
Described air core reactor turn-to-turn fault guard method, is characterized in that, comprise following steps:
Step one: air core reactor turn-to-turn fault judges, induction coil is installed by air core reactor, the uneven situation of the voltage utilizing induction coil to respond to or electric current, accurately judges turn-to-turn fault and evolution thereof; Calculate induction coil induced voltage, utilize balancing transformer to eliminate foozle and the alignment error of three-phase reactor, judge Reactor Fault situation;
Step 2: the interturn protection of air core reactor judges: adopt two groups of coils, 22 methods of getting are adopted to judge, increase the reliability of protection, described determination methods can take different judgement signals according to application scenario difference, power-frequency voltage or electric current are adopted for conventional parallel reactor, harmonic voltage or electric current are adopted for filter reactor;
Step 3: the faulty action preventing measure of air core reactor guard method:
(1) unbalanced fault preventing circuit from occurring by number of ampere turns rate of change size causes false protection (if external fault number of ampere turns rate of change can become very large, inductor turn-to-turn fault number of ampere turns rate of change is less);
(2) prevent harmonic wave from causing false protection by the multiple subharmonic of filtering 3;
(3) line attachment three-phase current, from line current instrument transformer access Microcomputer Protection, the inductance change of auxiliary judgment phase-splitting reactor, with this auxiliary judgment condition the most.
The beneficial effects of the utility model: be shunt reactor, series connection current limiting reactor, filter reactor, the most frequently used inductor turn-to-turn fault protective device and the methods thereof such as capacitor current limiting reactor, strong adaptability, respond well, be widely used.
Accompanying drawing explanation
Fig. 1: hollow reactor interturn short circuit protection induction coil open delta wiring voltage protection mode;
Fig. 2: hollow reactor interturn short circuit protection induction coil both-end star-star connection current protection mode;
Fig. 3: hollow reactor interturn short circuit protection induction coil scheme of installation.
Embodiment
Air core reactor turn-to-turn fault guard method described in the utility model patent; there is clear principle; judge simple directly feature; utilize low pressure induction coil to measure the operating state of high voltage reactor, be namely equivalent to add open circuit secondary coil (becoming transformer) to shielded reactor.Low pressure induction coil layout is ground potential place bottom reactor, and measuring equipment is simple and reliable, and equipment manufacturing cost is low, and concrete operation step is as follows:
Step one: the uneven situation of the voltage utilizing induction coil to respond to or electric current, accurately judges turn-to-turn fault and evolution thereof:
(1) voltage method, utilize protected three-phase reactor ampere-turn under normal circumstances symmetrical consistent, induction coil induced voltage three-phase symmetrical balances, open delta voltage is zero (or being a certain fiducial value), after certain phase reactor generation turn-to-turn fault, there is larger change in the ampere-turn of this its leakage flux of phase reactor, the coil-induced voltage arrived of three-phase induction occurs uneven, be reflected in the open delta mode of connection and just occurred comparatively large unbalance voltage, can accurately judge turn-to-turn fault and evolution thereof thus;
(2) current methods, three-phase reactor ampere-turn is symmetrical consistent under normal circumstances, the induced voltage three-phase symmetrical balance of induction coil is sensed by leakage flux, the three-phase loop short circuit current three-phase symmetrical of star shortening contact mode is consistent, its short circuit two ends output current is zero (or being a certain fiducial value), when after certain phase reactor generation turn-to-turn fault, there is larger change in the ampere-turn of this its leakage flux of phase reactor, the coil-induced voltage arrived of three-phase induction occurs uneven, be reflected in and will export unsymmetrical current at star short dot two ends in star shortening contact mode, turn-to-turn fault and evolution thereof is judged with this.
Step 2: calculate induction coil induced voltage, utilizes balancing transformer to eliminate foozle and the alignment error of three-phase reactor, judges Reactor Fault situation:
The number of ampere turns of induction coil passes through protected reactor mean turn, line bag diameter, line bag height, the centre distance of reactor and induction coil, and the technical parameters such as induction coil diameter calculate gained, according to law of magnetic induction, and induction coil induced voltage:
Induced voltage ε
a,ε
b,ε
cafter balancing transformer, eliminate the manufacture of three-phase reactor itself, alignment error, then three-phase joins end to end and forms open delta protection and both-end star-star connection current protection, by unbalance voltage (U
o=ε
a+ ε
b+ ε
c) and electric current (I
o=I
a+ I
b+ I
c) judge Reactor Fault situation, can effectively distinguish outside and internal fault condition.
Described air core reactor guard method is: adopt two groups of coils, adopts 22 methods of getting to judge, increases the reliability of protection.Wherein said determination methods can take different judgement signals according to application scenario difference, for conventional parallel reactor, can adopt power-frequency voltage or electric current, can adopt harmonic voltage or electric current for filter reactor.
Following faulty action preventing measure is taked in wherein said air core reactor guard method:
(1) unbalanced fault preventing circuit from occurring by number of ampere turns rate of change size causes false protection (if external fault number of ampere turns rate of change can become very large, inductor turn-to-turn fault number of ampere turns rate of change is less);
(2) prevent harmonic wave from causing false protection by the multiple subharmonic of filtering 3;
(3) line attachment three-phase current, from line current instrument transformer access Microcomputer Protection, the inductance change of auxiliary judgment phase-splitting reactor, with this auxiliary judgment condition the most.
Claims (2)
1. an air core reactor turn-to-turn fault protective device; it is characterized in that; comprise low pressure induction coil, balancing transformer, Microcomputer Protection device; described low pressure induction coil is arranged on reactor bottom potential place; described balancing transformer is arranged on below low pressure induction coil, and described Microcomputer Protection device is arranged on reactor end.
2. air core reactor turn-to-turn fault protective device as claimed in claim 1, it is characterized in that, described low pressure induction coil is three-phase induction coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520371112.8U CN204651898U (en) | 2015-06-02 | 2015-06-02 | A kind of air core reactor turn-to-turn fault protective device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520371112.8U CN204651898U (en) | 2015-06-02 | 2015-06-02 | A kind of air core reactor turn-to-turn fault protective device |
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| CN204651898U true CN204651898U (en) | 2015-09-16 |
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| CN201520371112.8U Expired - Fee Related CN204651898U (en) | 2015-06-02 | 2015-06-02 | A kind of air core reactor turn-to-turn fault protective device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953545A (en) * | 2015-06-02 | 2015-09-30 | 珠海蓝瑞盟电气有限公司 | Air-core reactor interturn fault protection device and air-core reactor interturn fault protection method |
| CN109818333A (en) * | 2019-03-25 | 2019-05-28 | 北京国网富达科技发展有限责任公司 | A kind of reactor short circuit monitoring method and device |
| CN110568302A (en) * | 2019-09-16 | 2019-12-13 | 杭州电力设备制造有限公司 | Transformer turn-to-turn fault detection method and device |
| CN113675819A (en) * | 2020-05-14 | 2021-11-19 | 南京南瑞继保电气有限公司 | Reactor turn-to-turn protection method and device and electronic equipment |
-
2015
- 2015-06-02 CN CN201520371112.8U patent/CN204651898U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953545A (en) * | 2015-06-02 | 2015-09-30 | 珠海蓝瑞盟电气有限公司 | Air-core reactor interturn fault protection device and air-core reactor interturn fault protection method |
| CN104953545B (en) * | 2015-06-02 | 2019-07-02 | 珠海蓝瑞盟电气有限公司 | A kind of air reactor turn-to-turn fault protective device and its method |
| CN109818333A (en) * | 2019-03-25 | 2019-05-28 | 北京国网富达科技发展有限责任公司 | A kind of reactor short circuit monitoring method and device |
| CN109818333B (en) * | 2019-03-25 | 2020-05-08 | 北京国网富达科技发展有限责任公司 | Short circuit monitoring method and device for reactor |
| CN110568302A (en) * | 2019-09-16 | 2019-12-13 | 杭州电力设备制造有限公司 | Transformer turn-to-turn fault detection method and device |
| CN113675819A (en) * | 2020-05-14 | 2021-11-19 | 南京南瑞继保电气有限公司 | Reactor turn-to-turn protection method and device and electronic equipment |
| CN113675819B (en) * | 2020-05-14 | 2023-11-17 | 南京南瑞继保电气有限公司 | Inter-turn protection method and device of reactor and electronic equipment |
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| 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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150916 Termination date: 20200602 |