CN103326339A - Method for reducing influence of saturated-core-type superconductivity current limiter on high-voltage network relay protection - Google Patents

Method for reducing influence of saturated-core-type superconductivity current limiter on high-voltage network relay protection Download PDF

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Publication number
CN103326339A
CN103326339A CN2013102827211A CN201310282721A CN103326339A CN 103326339 A CN103326339 A CN 103326339A CN 2013102827211 A CN2013102827211 A CN 2013102827211A CN 201310282721 A CN201310282721 A CN 201310282721A CN 103326339 A CN103326339 A CN 103326339A
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CN
China
Prior art keywords
relay protection
current
current limiter
core
saturated
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.)
Pending
Application number
CN2013102827211A
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Chinese (zh)
Inventor
彭俊臻
王斐宏
宋萌
曹昆南
胡南南
王达达
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Yunnan Power Grid Corp Technology Branch
Yunnan Electric Power Experimental Research Institute Group Co Ltd of Electric Power Research Institute
Original Assignee
Yunnan Power Grid Corp Technology Branch
Yunnan Electric Power Experimental Research Institute Group Co Ltd of Electric Power Research Institute
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Application filed by Yunnan Power Grid Corp Technology Branch, Yunnan Electric Power Experimental Research Institute Group Co Ltd of Electric Power Research Institute filed Critical Yunnan Power Grid Corp Technology Branch
Priority to CN2013102827211A priority Critical patent/CN103326339A/en
Publication of CN103326339A publication Critical patent/CN103326339A/en
Pending legal-status Critical Current

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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Abstract

The invention provides a method for reducing the influence of a saturated-core-type superconductivity current limiter on high-voltage network relay protection. The method is characterized by comprising the following steps of: (1) arranging the saturated-core-type superconductivity current limiters at the inner sides of all line voltage transformers and current transformers, and ensuring that the electric quantities measured by the voltage transformers and current transformers doe not pass through the current limiters; and reducing the influence of the current limiters on the relay protection of a system by changing the arrangement points of the conventional saturated-core-type superconductivity current limiters from the point of engineering; (2) ensuring that the reliability of relay protection of the system is unchanged under the condition that the protective parameters and the setting values originally set by a relay protection system are unchanged; and (3) ensuring that an enough electric safety distance is left in each electric equipment in the engineering proposal. The method has the advantages that the reliability and the power swing of a line impedance relay are ensured, known through calculation, the influence on the distance protection of adjacent lines is very little, and the reliability of the whole relay protection system is basically unchanged.

Description

A kind of saturable core type superconductive current limiter that reduces continues on high voltage network and protects the method for impact
Technical field
The method belongs to the utilization field of superconducting power apparatus in electric power system.
Background technology
Along with electric power system scale development enlarges, installed capacity grows with each passing day, and voltage levvl improves constantly, and system impedance is more and more less, has caused the system short-circuit electric current increasing.The safe operation of power system device has been arrived in serious threat, and restriction grid short circuit electric current is imperative.
Saturable core type superconductive current limiter is a kind of comparatively desirable high voltage flow restricter, it is simple in structure, unshakable in one's determination by AC magnetic field and D.C. magnetic field acting in conjunction, when system works, iron core is in magnetization degree of depth saturation region, and during fault, iron core enters limited current state without the time limit automatic trip from the saturation region.Excitation winding reduces the power of dc constant flowing power greatly by the superconductor coiling, and during the limiting short-circuit current, the superconduction winding is quench not, does not therefore have superconductor problem recovery time.The repeatedly self-starting of this flow restricter is suitable for the requirement of reclosing operation.
Because superconductive current limiter application meeting in electric power system exerts an influence to relaying protection; especially comparatively obvious for the distance protection impact; present numerous experts and scholars just be devoted to research by the whole bag of tricks (as, recomputate setting value etc.) reduce it to the adverse effect of system protection.
Summary of the invention
Because this method has both guaranteed the good confinement effect of flow restricter to the high-voltage system short circuit current by changing saturable core type superconductive current limiter connecting system position, reaching, and reduces greatly the impact on the original system relaying protection.This method purpose is to solve the access of saturable core type superconductive current limiter to the adverse effect of system relay protection, the reliability that the system of assurance continues and protects.
The present invention realizes by following technical proposal:
A kind of saturable core type superconductive current limiter that reduces continues on high voltage network and protects the method for impact, and feature of the present invention is:
1) mounting points of saturable core type superconductive current limiter is chosen at all circuit PT (voltage transformer), CT(current transformer) inboard, guarantee the PT(voltage transformer), the CT(current transformer) electric parameters measured do not pass through flow restricter; Reduce flow restricter from the angle of engineering and introduce impact on system relay protection by changing traditional saturable core type superconductive current limiter mounting points;
2) do not change Protection parameters and the setting value of the former setting of insurance system that continues, guarantee that the reliability of system relay protection is constant;
3) each electric equipment need guarantee to leave enough electrical safety distances (seeing Table 1) in the engineering proposal.
The safe distance of the various different electric pressures of table 1
On China 220kV and above circuit and important 110kV interconnector; the main relaying protection that comes into operation has distance protection; pilot protection and zero-sequence current direction protection etc.; by present existing superconductive current limiter access scheme; flow restricter will be connected on change shop station track way outlet side (being flow restricter A point position among Fig. 2) this moment because current transformer and the voltage transformer (2a and 7 among Fig. 2) of outgoing line side; electric current and the flow restricter pressure drop of the flow restricter of flowing through taken into account in measurement; to cause measuring impedance magnitude larger than actual track; impedance angle is also large than the line impedance angle; Figure 1 shows that the operating characteristics that adds saturable core type superconductive current limiter fore-and-aft direction impedance relay, Z among Fig. 1 SetBe the impedance of adjusting, Z mFor measuring impedance, Z SfclBe the current-limiting impedance of SCFCL, when short trouble occured, the current-limiting impedance that flow restricter produces became Z Sfcl, changed the original impedance operator of circuit.After adding flow restricter, the measurement impedance Z of script in the characteristic circle mMay become the outer measurement impedance Z of circle m'; this will cause directional impedance relay can't detect in the circle fault and so that protect among the malfunctioning Fig. 2 of being the circuit breaker 1a can not tripping; the flow restricter current limiting performance is better; the impact of the larger generation of current-limiting impedance is larger; this impact greatly reduces the sensitivity of relaying protection; simultaneously, adjust the distance the reliability of protection produce unfavorable.
In the existing documents and materials, usually with the directional impedance relay of again the adjusting impedance Z of adjusting SetThe method of value is to guarantee the reliability and sensitivity of protection action.Yet, know according to the impedance operator of saturable core type superconductive current limiter, for the short circuit current of different sizes, the flow restricter current-limiting impedance is different, makes troubles for the impedance of again adjusting.In addition, should guarantee that two sets of plan guarantees that flow restricter rear relaying protection out of service continues normal operation.Obviously, bring burden to relay protection devices on the one hand by changing the system relay impedance of adjusting, on the other hand the reliability service of relaying protection brought risk.
A kind of saturable core type superconductive current limiter that reduces continues on high voltage network and protects the method for impact; can be by changing the flow restricter on-position; well solve the access of saturable core type superconductive current limiter to the adverse effect of system relay protection, the reliability that the system of assurance continues and protects, specific as follows:
Because flow restricter often is connected on line outlet place (A point position among Fig. 2); so the inevasible protection of adjusting the distance is exerted an influence; by analyzing and investigation; if with the flow restricter reconfiguration to measuring component PT(voltage transformer); the CT(current transformer) and go out line side isolating switch (3a among Fig. 2) afterwards (B point position among Fig. 2); both can guarantee the normal operation of bus (among Fig. 2 6) side circuit breaker (1a among Fig. 2) and both sides isolating switch (4a and 4b among Fig. 2); the current transformer of while outgoing line side and voltage transformer (2a and 7 among Fig. 2) then measurement result are the circuit practical impedance; no matter short circuit current is much; the variation of flow restricter impedance can not impact it, guarantees that this circuit continues to protect original reliability and sensitivity.It should be noted that main transformer side current transformer (2b among Fig. 2) is measured takes into account the electric current that flows through flow restricter; But the access that studies show that flow restricter is very little on the transformer differential protection impact, thus main transformer side circuit breaker (1b among Fig. 2) and main transformer side isolating switch (3b among Fig. 2) but still normal reliable work.
The beneficial effect of the inventive method is:
1) simple, change the flow restricter on-position by engineering mode, reach the impact that reduces protection.
2) effective, the access of flow restricter suppresses the growth of short circuit current fast, avoids the impact on impedance relay.
3) reliable, this project method can not have a negative impact to the normal operation of other equipment substantially, and it is reliable and stable that the system that guarantees fully continues and protects.
Description of drawings
Fig. 1 accesses the performance chart behind the SCFCL;
Fig. 2 is saturable core type superconductive current limiter mounting points design diagram;
Fig. 3 is invention instance system figure;
Embodiment
A kind of saturable core type superconductive current limiter that reduces continues on high voltage network and protects the method for impact, and feature of the present invention is:
1) mounting points of saturable core type superconductive current limiter is chosen at all circuit PT (voltage transformer), CT(current transformer) inboard, guarantee the PT(voltage transformer), the CT(current transformer) electric parameters measured do not pass through flow restricter; Reduce flow restricter from the angle of engineering and introduce impact on system relay protection by changing traditional saturable core type superconductive current limiter mounting points;
2) do not change Protection parameters and the setting value of the former setting of insurance system that continues, guarantee the reliability of system relay protection not
Become;
3) each electric equipment need guarantee to leave enough electrical safety distances (seeing Table 1) in the engineering proposal.
The safe distance of the various different electric pressures of table 1
Example 1. is the system schematic of transmission line such as Fig. 3, and M side and N side system parameter are: M side capacity S M=200MVA, voltage U M=500kV; N side capacity S N=150MVA, voltage U N=500kV; The rated frequency f=50Hz of system, power-factor cos ψ=0.8; Transformer T M, T NCapacity is 200MVA, and no-load voltage ratio is 220/525kV and 200/500kV, and short-circuit voltage compares U k=14%; The transmission line impedance is 0.42 Ω/km, length 200km; Approximately 3.1 ohm of flow restricter stable state impedances, approximately 12.1 ohm of failure current limit impedances.As shown in Figure 2 flow restricter is installed respectively in the drawings A, the B place, when the upper diverse location of power transmission line L breaks down, continue to protect and measure impedance magnitude | Z m|, phase place ψ is as shown in table 2.
Table 2 different faults continues during apart from flow restricter packing A, B place to protect and measures impedance
Calculate according to theory:
50km length line impedance is: | Z 50|=0.42 Ω/km * 50km=21 Ω
100km length line impedance is: | Z 100|=0.42 Ω/km * 100km=42 Ω
150km length line impedance is: | Z 150|=0.42 Ω/km * 150km=63 Ω
To sum up, flow restricter is attached to A shown in Figure 2 place's meeting so that the faulty line impedance that relay protection devices is surveyed is excessive.The sensitivity of protecting that continues is caused adverse effect, if flow restricter is attached to B shown in Figure 2 place, then can avoid preferably the impact of flow restricter access on continuing and protecting.

Claims (1)

1. one kind is reduced saturable core type superconductive current limiter and high voltage network is continued protects the method for impact, it is characterized in that:
1) mounting points of saturable core type superconductive current limiter is chosen at all line voltage distribution instrument transformers, and current transformer is inboard, guarantees voltage transformer, and the electric parameters that current transformer is measured is not passed through flow restricter; Reduce flow restricter from the angle of engineering and introduce impact on system relay protection by changing traditional saturable core type superconductive current limiter mounting points;
2) do not change Protection parameters and the setting value of the former setting of insurance system that continues, guarantee that the reliability of system relay protection is constant;
3) each electric equipment need guarantee to leave enough electrical safeties apart from as follows in the engineering proposal:
The safe distance of various different electric pressures
CN2013102827211A 2013-07-06 2013-07-06 Method for reducing influence of saturated-core-type superconductivity current limiter on high-voltage network relay protection Pending CN103326339A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110032650A1 (en) * 2009-08-07 2011-02-10 Sungkyunkwan University Foundation For Corporate Collaboration Reclosing control system and method using superconducting fault current limiter
CN102684308A (en) * 2012-05-18 2012-09-19 上海交通大学 Superconducting state information-based power distribution network self-healing system and method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110032650A1 (en) * 2009-08-07 2011-02-10 Sungkyunkwan University Foundation For Corporate Collaboration Reclosing control system and method using superconducting fault current limiter
CN102684308A (en) * 2012-05-18 2012-09-19 上海交通大学 Superconducting state information-based power distribution network self-healing system and method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
何妍等: "比较两种SFCL对电力系统的影响", 《稀有金属材料与工程》, vol. 37, 31 October 2008 (2008-10-31), pages 236 - 240 *
夏毅等: "超导限流器对电力系统继电保护和暂态稳定的影响", 《电工电能新技术》, vol. 26, no. 2, 30 April 2007 (2007-04-30) *

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Application publication date: 20130925