CN104155578B - The fault detection method of the T-shaped 10kV distribution lines based on on-pole switch - Google Patents

The fault detection method of the T-shaped 10kV distribution lines based on on-pole switch Download PDF

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Publication number
CN104155578B
CN104155578B CN201410407472.9A CN201410407472A CN104155578B CN 104155578 B CN104155578 B CN 104155578B CN 201410407472 A CN201410407472 A CN 201410407472A CN 104155578 B CN104155578 B CN 104155578B
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China
Prior art keywords
pole switch
current value
distribution
circuit
setting valve
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CN201410407472.9A
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CN104155578A (en
Inventor
任国威
任瑞
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State's Net Henan Province Power Co Ltd Xinyang Power Supply Co ltd
State Grid Corp of China SGCC
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State's Net Henan Province Power Co Ltd Xinyang Power Supply Co ltd
State Grid Corp of China SGCC
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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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52Outage or fault management, e.g. fault detection or location

Abstract

The invention discloses a kind of fault detection method of the T-shaped 10kV distribution lines based on on-pole switch, step 1, every 10kV distribution lines are divided into multistage, one on-pole switch is set on every section of circuit, two 10kV distribution lines intersect T-type structure, there is an on-pole switch on every section of circuit of T-type structure;Step 2,10KV distribution wires start to power, and the controller of each on-pole switch reads the current value of each section of distribution line respectively;Step 3, when T-type structure is located at the on-pole switch DL of T node lower positionsNWhen the current value of reading is more than setting valve, then step 4 is performed.The present invention proposes the detection method of the on-pole switch with T-shaped on-pole switch circuit and installed in T node lower positions; the on-pole switch protection seting that can be efficiently solved in supply line is cumbersome; the problems such as accommodation mode ability; it is simple with adjusting; the characteristics of setting valve of action is low, and failure removal is quick, not malfunction.

Description

The fault detection method of the T-shaped 10kV distribution lines based on on-pole switch
Technical field
The present invention relates to a kind of 10kV distribution lines, more particularly, to a kind of T-shaped 1 0kV distribution wires based on on-pole switch The fault detection method on road.
Background technology
The on-pole switch protection device installed in existing 10kV distribution lines, the company of distribution line between different substation Relation complexity is connect, causes to adjust complexity, and do not adapt to protection domain and electric current side after same section of circuit switching power supply of distribution To the problem of change, cause to adjust complexity, a set of setting valve can only adapt to a kind of mode of connection, easy tripping or malfunction, because matching somebody with somebody Netting twine way switch is on the electric pole of circuit, or is distributed on the distribution box in different locations in suburbs, and adjustment setting valve is difficult.When During generation line fault, the near terminal fault electric current big-movement time is short, far-end fault fault current little trick time length.On-pole switch Protection seting, one kind protection Baoding setting valve can only adapt to a kind of power supply mode, only be relied on manually again once mode changes Protection definite value to on-pole switch is changed to another again by adaptable protection fixed value adjusting and setting from a kind of power supply mode Kind power supply mode is existing to protect definite value not adapt to the mode after change, it is possible to create malfunction because electrical distance changes Or tripping.Or change quick-break be changed into extend disconnect time, the time of disengagement failure circuit is longer, caused by current disturbing get over Greatly, the stability of power distribution network is poorer.
The content of the invention
In view of this, it is an object of the invention to provide a kind of failure of the T-shaped 10kV distribution lines based on on-pole switch Detection method, it is proposed that in three on-pole switch on T intersections road, positioned at the on-pole switch of T node lower positions, tool There is the detection method of T-shaped on-pole switch circuit and the on-pole switch installed in T node lower positions, supply lines can be efficiently solved On-pole switch protection seting in road is cumbersome, the problems such as accommodation mode ability, has and adjusts simple, and the setting valve of action is low, The characteristics of failure removal is quick, not malfunction.
To reach above-mentioned purpose, the present invention uses following technical scheme:
A kind of fault detection method of the T-shaped 10kV distribution lines based on on-pole switch, comprises the following steps:
Step 1, every 10kV distribution line is divided into multistage, and an on-pole switch, two 10kV are set on every section of circuit Distribution line intersects T-type structure, there is an on-pole switch on every section of circuit of T-type structure;
Step 2,10kV distribution wires start to power, and the controller of each on-pole switch reads the electricity of each section of distribution line respectively Flow valuve;
Step 3, when T-type structure is located at the on-pole switch DL of T node lower positionsNThe current value of reading is more than setting valve When, then perform step 4;If it is not, then perform step 2;
Step 4, on-pole switch DL is readN+1Current value, when the current value of reading is more than setting valve, perform step 2; When the current value of reading is less than setting valve, step 5 is performed;
Step 5, on-pole switch DL is readN-1aAnd DLN-1bCurrent value, as reading on-pole switch DLN-1aOr DLN-1bElectric current When value is more than setting valve, DLNTripping operation, disconnect faulty line.
Preferably, described setting valve is 1.3 times of CT no-load voltage ratios.
The beneficial effects of the invention are as follows:
The T-shaped distribution line of the present invention is provided with three on-pole switch, when T-type structure breaks down, not only to consider The current value of this section of on-pole switch, also consider other two on-pole switch of T-type structure and latter circuit on-pole switch Current value, whether their current value meet the barring condition that requirement is adjacent elements, being capable of disengagement failure rapidly and sensitively Circuit.The method of the present invention is when the power supply mode of circuit changes, it is not necessary to recalculate setting valve, the distal end of circuit with Near terminal fault can quick break switch, as long as the CT no-load voltage ratios of on-pole switch do not change, the protection domain of on-pole switch or direction After changing, it is not necessary to readjust setting valve, relay fail or the possibility of malfunction when avoiding failure.The present invention can be effective The on-pole switch protection seting that ground is solved in supply line is cumbersome, the problems such as accommodation mode ability, has and adjusts simple, action Setting valve it is low, the characteristics of failure removal is quick, not malfunction.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of one embodiment of the present invention;
Fig. 2 is flow chart of the method for the present invention.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
As shown in figure 1, in the present embodiment, the distribution line of A transformer stations is by on-pole switch DL1, DL2, DLN-1a、DLN、 DLN+1It is divided into L1、L2、LN-1、LN、LN+1Five sections.The distribution line of B transformer stations is by DL3, DLN-1bIt is divided into L3、LN-1Two sections, B transformer stations Intersect composition T-type structure with the distribution line of A transformer stations.
When normal operation, on-pole switch DLN-1bDisconnect, A transformer stations power supply L1、L2、LN-1、LN、LN+1Five sections of circuits are born Lotus;B transformer stations power supply L3Section line load.When A stations, on-pole switch DL is closedN-1b, the contracting of protection domain that DL2 posts are opened Small, the sense of current is reverse, and on-pole switch DL3 protection domains expand, therefore the protection domain opened by post or direction change, former Protect definite value not adapt to new power supply mode, during failure relay fail or malfunction be likely to occur.
Based on the above situation, the present invention proposes the detection method that need not readjust setting valve, as shown in Fig. 2 this The fault detection method of invention uses following steps:
Step 1, every 10kV distribution line is divided into multistage, and an on-pole switch, two 10kV are set on every section of circuit Distribution line intersects T-type structure, there is an on-pole switch on every section of circuit of T-type structure;
Step 2,10kV distribution wires start to power, and the controller of each on-pole switch reads the electricity of each section of distribution line respectively Flow valuve;
Step 3, when T-type structure is located at the on-pole switch DL of T node lower positionsNThe current value of reading is more than setting valve When, then perform step 4;If it is not, then perform step 2;
Step 4, on-pole switch DL is readN+1Current value, when the current value of reading is more than setting valve, perform step 2; When the current value of reading is less than setting valve, step 5 is performed;
Step 5, on-pole switch DL is readN-1aAnd DLN-1bCurrent value, as reading on-pole switch DLN-1aOr DLN-1bElectric current When value is more than setting valve, DLNTripping operation, disconnect faulty line.
Above-mentioned setting valve is 1.3 times of CT no-load voltage ratios.
As circuit LN+1Certain point short trouble occurs, the on-pole switch DL on circuitN-1a(or DLN-1b)DLN、DLN+1Simultaneously Experience fault current, DLNController automatic blocking.As circuit LNEnd point short trouble, only on-pole switch occurs DLN-1a(or DLN-1b)DLNExperience fault current, and DLN+1Fault current is not flowed through.As circuit LN-1End point occur short circuit Failure, only on-pole switch DLN-1a(or DLN-1b) experience fault current, and DLN+1、DLNFault current is not flowed through.
As distribution line DL1Switch off, all part of paths are changed to B transformer stations power supply L1, L by A transformer stations2、LN-1a、LN、 LN+1On five sections of circuits DL protection definite value because power supply point to failure electricity electrical distance change its protection seting value need again Calculating is adjusted;If excessively stream actuation time is too short, the fluctuation of distribution customer charge will cause false tripping, form power-off event.For this Invention increase detection DLN-1a、DLN-1bAnd DLN+1Whether the electric current of switch reaches DLNLocking bar of the Trip Logic as adjacent elements Part, once on-pole switch DLNOn the electric current of experiencing of protection device be more than 1.3 times of CT no-load voltage ratios, be detected simultaneously by DLN-1a、 (Or DLN-1b)Electric current be more than setting valve and detect DLN+1Electric current be less than setting valve then DLNNo-delay tripping operation, this protection Because starting current is small, actuation time is short, line fault caused by various failures can be cut off soon and with sensitivity, while again The malfunction of other sections of line fault can be reliably avoided, it is differential and current value is matched somebody with somebody by the time to change existing relay protection setting Selectivity, the sensitivity solution of the failure removal of conjunction.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, this area is common Other modifications or equivalent substitution that technical staff is made to technical scheme, without departing from technical solution of the present invention Spirit and scope, all should cover among scope of the presently claimed invention.

Claims (1)

  1. A kind of 1. fault detection method of the T-shaped 10kV distribution lines based on on-pole switch, it is characterised in that:Including following step Suddenly:
    Step 1, every 10kV distribution line is divided into multistage, and an on-pole switch, two 10kV distribution are set on every section of circuit Circuit intersects T-type structure, there is an on-pole switch on every section of circuit of T-type structure, and 10kV distribution lines start to power;
    Step 2, the controller of each on-pole switch reads the current value of each section of distribution line respectively;
    Step 3, when T-type structure is located at the on-pole switch DL of T node lower positionsNWhen the current value of reading is more than setting valve, then hold Row step 4;If it is not, then perform step 2;
    Step 4, on-pole switch DL is readN+1Current value, when the current value of reading is more than setting valve, perform step 2;Work as reading When the current value taken is less than setting valve, step 5 is performed;
    Step 5, on-pole switch DL is readN-1aAnd DLN-1bCurrent value, as reading on-pole switch DLN-1aOr DLN-1bCurrent value be more than During setting valve, DLNTripping operation, disconnect faulty line.
CN201410407472.9A 2014-08-19 2014-08-19 The fault detection method of the T-shaped 10kV distribution lines based on on-pole switch Active CN104155578B (en)

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CN104155578B true CN104155578B (en) 2018-01-05

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Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08172719A (en) * 1994-12-19 1996-07-02 Sumitomo Electric Ind Ltd Method of detecting fault of transmission line
CN102104246A (en) * 2011-01-30 2011-06-22 武汉百叡电力技术有限公司 Method and device for reducing time limit combination step progression of distribution network relaying protection
CN102761108B (en) * 2012-07-18 2014-10-08 积成电子股份有限公司 Logic operation-based distributed feeder automatization fault judgment method
CN102790383B (en) * 2012-08-20 2015-02-25 山东大学 Automatic rapid protection control method of novel feeder
CN102830328B (en) * 2012-08-23 2014-11-19 上海交通大学 Distributed fault location method for T-circuit
KR20140056964A (en) * 2012-11-02 2014-05-12 한국전력공사 Method for deciding direction of recloser for distribution line

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