CN204154872U - A kind of device detecting fossil power plant auxiliary engine system low-voltage ride-through capability - Google Patents

A kind of device detecting fossil power plant auxiliary engine system low-voltage ride-through capability Download PDF

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Publication number
CN204154872U
CN204154872U CN201420316424.4U CN201420316424U CN204154872U CN 204154872 U CN204154872 U CN 204154872U CN 201420316424 U CN201420316424 U CN 201420316424U CN 204154872 U CN204154872 U CN 204154872U
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China
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tested
capability
power plant
auxiliary engine
voltage ride
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CN201420316424.4U
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Inventor
吴水军
李胜男
陈晶
杨杨
刘明群
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Yunnan Power Grid Corp Technology Branch
Yunnan Electric Power Experimental Research Institute Group Co Ltd of Electric Power Research Institute
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Yunnan Power Grid Corp Technology Branch
Yunnan Electric Power Experimental Research Institute Group Co Ltd of Electric Power Research Institute
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Abstract

The utility model discloses a kind of device detecting fossil power plant auxiliary engine system low-voltage ride-through capability.Adopt impedance voltage divider principle, be connected between tested auxiliary system and its electric power incoming line, current limiting reactor is utilized to access the different of capacity of short circuit from short-circuit reactance device, by between bypass breaker and circuit breaker point, combined floodgate cooperation control, make tested auxiliary system Voltage Drop to specified level, thus reach the object that tested auxiliary system low voltage ride-through capability is detected.This covering device adopts modular design, is packaged in internal container, has that structure is simple, on-site installation work amount is little, and detecting electric amount easily obtains, convenient transportation, the feature of applied range.

Description

A kind of device detecting fossil power plant auxiliary engine system low-voltage ride-through capability
Technical field
The utility model relates to relay protection in electric system, electric and electronic technical field, particularly relates to the pick-up unit of fired power generating unit 400V, 6kV auxiliary system low voltage ride-through capability.
Background technology
The feeder of fired power generating unit, powder-feeder frequency are important subsidiary engine equipment; frequency control way is mostly adopted to run at present; locking exports when electrical network low voltage by such frequency converter, thus causes fired power generating unit all flames lost to protect (MFT) action chaser.What Northeast China Power Grid once occurred causes system voltage low because of 500kV electrical network single-phase earthing earth fault, Yimin Power Plant, generating plant, Hulun Buir unit feeder are out of service, boiler extinguishment, causes genset to trip and just belongs to the typical case of such problem with grid disconnection.
In order to solve such problem, mainly start with from transformation and detection two aspects, namely one side is transformed the current transformer of involved auxiliary system and control system thereof, makes it possess low voltage ride-through capability; Namely the current and improved low voltage ride-through capability of current transformer involved by auxiliary system is detected on the other hand, guarantee that the auxiliary system transformation of being correlated with can reach the object of expection, thus possess low voltage ride-through capability.
Utility model content
The purpose of this utility model is to provide a kind of device detecting fossil power plant auxiliary engine system low-voltage ride-through capability, and auxiliary system low voltage ride-through capability of can being correlated with to paid close attention to fired power generating unit detects.
In order to achieve the above object, the utility model adopts following technical scheme:
Detect a device for fossil power plant auxiliary engine system low-voltage ride-through capability, the utility model is characterised in that, this device serial connection is between tested fossil power plant auxiliary engine system and its inlet wire, comprise system side disconnector, system side isolating switch, system side grounding switch, bypass breaker, current limiting reactor, tested side isolating switch, tested side disconnector, tested side grounding switch, short-circuit reactance device, circuit breaker, short circuit grounding switch; Wherein, system side disconnector, system side isolating switch, bypass breaker, tested side isolating switch, tested side disconnector sequentially connects; At system side disconnector, connected system side grounding switch between system side isolating switch, at tested side isolating switch, connects tested side grounding switch between the disconnector of tested side; System side disconnector and system side grounding switch, and tested side disconnector and tested side grounding switch all adopt disjunctor operating mechanism; With short-circuit reactance device after current limiting reactor is in parallel with bypass breaker, circuit breaker, short circuit grounding switch sequentially connects.
Above-mentioned for detecting in the device of fossil power plant auxiliary engine system low-voltage ride-through capability, device is adapted to the 400V system at fossil power plant auxiliary engine system place, 6kV in interior system.
This device for detecting fossil power plant auxiliary engine system low-voltage ride-through capability, adopt impedance voltage divider principle, be connected between tested auxiliary system and its electric power incoming line, current limiting reactor is utilized to access the different of capacity of short circuit from short-circuit reactance device, by between bypass breaker and circuit breaker point, combined floodgate cooperation control, make tested auxiliary system Voltage Drop to specified level, thus reach the object that tested auxiliary system low voltage ride-through capability is detected.
Above-mentioned for detecting in the device of fossil power plant auxiliary engine system low-voltage ride-through capability, utilize supporting master control system, to bypass breaker and circuit breaker point, close a floodgate and carry out cooperation control, and needs according to auxiliary system the low voltage crossing index that possesses, to relative breaker point, the combined floodgate duration controls;
Above-mentioned for detecting in the device of fossil power plant auxiliary engine system low-voltage ride-through capability, the current limiting reactor of device access and the change of short-circuit reactance device capacity of short circuit are manually carried out, thus ensure that the correctness that reactor gear changes and reliability.
Above-mentioned for detecting in the device of fossil power plant auxiliary engine system low-voltage ride-through capability, the current transformer of matched with devices and voltage transformer (VT), realize the correct progress of disease of electric parameter in auxiliary system low voltage ride-through capability testing process, carry out record by the electricity recorder analyser of routine.
Above-mentioned for detecting in the device of fossil power plant auxiliary engine system low-voltage ride-through capability, utilizing supporting disconnector, grounding switch, realizing effective isolation and the reliable ground of proving installation and tested node live part respectively.
Effective effect of the present utility model is:
The utility model is for detecting in the device of fossil power plant auxiliary engine system low-voltage ride-through capability, adopt impedance voltage divider principle, by accessing this calibrating installation between tested fossil power plant auxiliary engine system and electric power incoming line thereof, by controlling current limiting reactor and the short-circuit reactance device capacity of short circuit of access, make tested auxiliary system Voltage Drop to specified level, thus reach the object that fossil power plant auxiliary engine system low-voltage ride-through capability is detected and passed judgment on.
Device for detecting fossil power plant auxiliary engine system low-voltage ride-through capability of the present utility model is provided by following example and accompanying drawing.
Accompanying drawing explanation
Fig. 1 is the main wiring diagram of the device of fossil power plant auxiliary engine system low-voltage ride-through capability.
Embodiment
Below the device for detecting fossil power plant auxiliary engine system low-voltage ride-through capability of the present utility model is described in further detail:
Detect a device for fossil power plant auxiliary engine system low-voltage ride-through capability, the utility model is characterised in that, this device serial connection is between tested fossil power plant auxiliary engine system and its inlet wire, comprise system side disconnector, system side isolating switch, system side grounding switch, bypass breaker, current limiting reactor, tested side isolating switch, tested side disconnector, tested side grounding switch, short-circuit reactance device, circuit breaker, short circuit grounding switch; Wherein, system side disconnector, system side isolating switch, bypass breaker, tested side isolating switch, tested side disconnector sequentially connects; At system side disconnector, connected system side grounding switch between system side isolating switch, at tested side isolating switch, connects tested side grounding switch between the disconnector of tested side; System side disconnector and system side grounding switch, and tested side disconnector and tested side grounding switch all adopt disjunctor operating mechanism; With short-circuit reactance device after current limiting reactor is in parallel with bypass breaker, circuit breaker, short circuit grounding switch sequentially connects.
Above-mentioned for detecting in the device of fossil power plant auxiliary engine system low-voltage ride-through capability, device is adapted to the 400V system at fossil power plant auxiliary engine system place, 6kV in interior system.。
Fig. 1 is the primary connection circuit figure of this device for detecting fossil power plant auxiliary engine system low-voltage ride-through capability, this device for detecting fossil power plant auxiliary engine system low-voltage ride-through capability, comprise a group system side disconnector, system side grounding switch, bypass breaker, circuit breaker, current limiting reactor, short-circuit reactance device, tested side disconnector and relevant supporting stube cable.
Supporting corresponding current transformer TA, voltage transformer (VT) TV, device master control system in Fig. 1, the electric secondary signal needed for fossil power plant auxiliary engine system low-voltage ride-through capability detects is got from secondary terminals, carries out record by the electricity recorder analyser of routine.
For detecting the device of fossil power plant auxiliary engine system low-voltage ride-through capability before testing in Fig. 1, bypass breaker closes, circuit breaker disconnects, tested auxiliary system from station service after tested device main circuit breaker, bypass breaker normally work, thus the access of assurance device does not affect the normal operation of tested auxiliary system.
For detecting the device of fossil power plant auxiliary engine system low-voltage ride-through capability after test start button is pressed in Fig. 1, separately bypass breaker is controlled by proving installation master control system, after bypass breaker auxiliary node returns, close circuit breaker, because the parallel connection of short-circuit reactance device accesses, cause tested auxiliary system Voltage Drop to specified level, and due to the access of current limiting reactor, ensure that tested fired power generating unit service power voltage maintains normal level, proving installation master control system starts timing, treat that timing time arrives, master control system controls separately circuit breaker, after circuit breaker auxiliary node returns, close bypass breaker, test process terminates, tested auxiliary system power supply is powered by bypass breaker, with normal operating mode without any difference, tested auxiliary system recovers normal and runs.
For detecting the device of fossil power plant auxiliary engine system low-voltage ride-through capability in test process in Fig. 1, get test relevant electric current, voltage signal by the electricity record analysis of routine from test secondary terminals row.
Although the utility model discloses as above with preferred embodiments, but and be not used to limit the utility model.Have in the utility model art and usually know the knowledgeable, not departing from spirit and scope of the present utility model, when doing various change and retouching.Therefore protection domain of the present utility model is when being as the criterion depending on those as defined in claim.

Claims (2)

1. detect a device for fossil power plant auxiliary engine system low-voltage ride-through capability, it is characterized in that, this device serial connection is between tested fossil power plant auxiliary engine system and its inlet wire, comprise system side disconnector, system side isolating switch, system side grounding switch, bypass breaker, current limiting reactor, tested side isolating switch, tested side disconnector, tested side grounding switch, short-circuit reactance device, circuit breaker, short circuit grounding switch; Wherein, system side disconnector, system side isolating switch, bypass breaker, tested side isolating switch, tested side disconnector sequentially connects; At system side disconnector, connected system side grounding switch between system side isolating switch, at tested side isolating switch, connects tested side grounding switch between the disconnector of tested side; System side disconnector and system side grounding switch, and tested side disconnector and tested side grounding switch all adopt disjunctor operating mechanism; With short-circuit reactance device after current limiting reactor is in parallel with bypass breaker, circuit breaker, short circuit grounding switch sequentially connects.
2. a kind of device detecting fossil power plant auxiliary engine system low-voltage ride-through capability as claimed in claim 1, it is characterized in that, tested fossil power plant auxiliary engine system comprises the system of 400V system, 6kV.
CN201420316424.4U 2014-06-13 2014-06-13 A kind of device detecting fossil power plant auxiliary engine system low-voltage ride-through capability Active CN204154872U (en)

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Application Number Priority Date Filing Date Title
CN201420316424.4U CN204154872U (en) 2014-06-13 2014-06-13 A kind of device detecting fossil power plant auxiliary engine system low-voltage ride-through capability

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Application Number Priority Date Filing Date Title
CN201420316424.4U CN204154872U (en) 2014-06-13 2014-06-13 A kind of device detecting fossil power plant auxiliary engine system low-voltage ride-through capability

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104833879A (en) * 2015-05-08 2015-08-12 国家电网公司 Low-voltage crossing testing system for low-voltage auxiliary frequency converter of thermal power plant
CN105022384A (en) * 2015-07-01 2015-11-04 国家电网公司 LVRT (Low Voltage Ride Through) closed-loop simulation test method of controller of high-voltage frequency converter of thermal plant
CN105334412A (en) * 2015-10-13 2016-02-17 国网安徽省电力公司 Auxiliary machine high/low voltage rid-through test method based on voltage disturbance generator
CN107843838A (en) * 2017-10-24 2018-03-27 国网山西省电力公司电力科学研究院 A kind of detection method of low voltage ride-through capability of wind turbine generator system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104833879A (en) * 2015-05-08 2015-08-12 国家电网公司 Low-voltage crossing testing system for low-voltage auxiliary frequency converter of thermal power plant
CN104833879B (en) * 2015-05-08 2018-05-15 国家电网公司 A kind of thermal power plant's low pressure subsidiary engine frequency converter low-voltage ride through detection system
CN105022384A (en) * 2015-07-01 2015-11-04 国家电网公司 LVRT (Low Voltage Ride Through) closed-loop simulation test method of controller of high-voltage frequency converter of thermal plant
CN105334412A (en) * 2015-10-13 2016-02-17 国网安徽省电力公司 Auxiliary machine high/low voltage rid-through test method based on voltage disturbance generator
CN107843838A (en) * 2017-10-24 2018-03-27 国网山西省电力公司电力科学研究院 A kind of detection method of low voltage ride-through capability of wind turbine generator system

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