CN104155578A - T-type pole-mounted-switch-based 10 KV distribution line fault detection method - Google Patents

T-type pole-mounted-switch-based 10 KV distribution line fault detection method Download PDF

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Publication number
CN104155578A
CN104155578A CN201410407472.9A CN201410407472A CN104155578A CN 104155578 A CN104155578 A CN 104155578A CN 201410407472 A CN201410407472 A CN 201410407472A CN 104155578 A CN104155578 A CN 104155578A
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China
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pole
switch
pole switch
shaped
current value
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CN201410407472.9A
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Chinese (zh)
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CN104155578B (en
Inventor
任国威
任瑞
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国家电网公司
国网河南省电力公司信阳供电公司
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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 T-type pole-mounted-switch-based 10 KV distribution line fault detection method. The method comprises the following steps: the step 1) each 10 KV distribution line is divided into a plurality of sections of lines, each section of line is provided with a pole-mounted switch, two 10 KV distribution lines meet to form a T-shaped structure, and each section of line of the T-shaped structure is provided with one pole-mounted switch; the step 2) the 10 KV distribution lines begin to supply power, and a controller of each pole-mounted switch reads current value of each section of line of the distribution lines; and the step 3) when the read current value of the pole-mounted switch DLN arranged under the T node of the T-shaped structure is larger than a setting valve, the step 4) is executed. According to the detection method of the pole-mounted switches with the T-shaped pole-mounted-switch lines and arranged under the T node, the problems of complex protection setting and poor adaptation mode capability of the pole-mounted switches in the power supply lines can be effectively solved; and the advantages of simple setting, low action setting value, fast fault removal, and no maloperation are achieved.

Description

The fault detection method of the T-shaped 10KV distribution line based on on-pole switch
Technical field
The present invention relates to a kind of 10KV distribution line, especially relate to a kind of fault detection method of the T-shaped 1 0KV distribution line based on on-pole switch.
Background technology
The on-pole switch protective device of installing in existing 10KV distribution line; the annexation complexity of distribution line between different substation; cause the complexity of adjusting; and can not adapt to the problem that protection domain and direction of current change after same section of circuit switching power supply of distribution, cause the complexity of adjusting, a set of setting valve can only adapt to a kind of mode of connection; easily tripping or misoperation; because distribution line switch is on the electric pole of circuit, or be distributed on the distribution box in different locations in suburbs, adjust setting valve difficulty.In the time there is line fault, the near terminal fault electric current big-movement time is short, and the far-end fault fault current little trick time is long.On-pole switch protection is adjusted; a kind of protection Baoding setting valve can only adapt to a kind of power supply mode; once mode change only reliable artificial again to the protection definite value of on-pole switch again by the protection fixed value adjusting and the setting that adapt; changing to another kind of power supply mode from a kind of power supply mode changes because of electrical distance; existing protection definite value can not adapt to mode after changing, may produce malfunction or tripping.Or change quick-break and become the time that extends disconnection, the time of disengagement failure circuit is longer, and the current disturbing causing is larger, and the stability of power distribution network is just poorer.
Summary of the invention
In view of this; the object of the present invention is to provide a kind of fault detection method of the T-shaped 1 0KV distribution line based on on-pole switch; propose to be arranged in three on-pole switchs on T intersection road; be positioned at the on-pole switch of T node lower position; there is T-shaped on-pole switch circuit and be arranged on the detection method of the on-pole switch of T node lower position; the on-pole switch protection that can effectively solve in supply line is adjusted loaded down with trivial details; the problems such as accommodation mode ability; have and adjust simply; the setting valve of action is low, failure removal fast, the feature of not malfunction.
For achieving the above object, the present invention by the following technical solutions:
A fault detection method for the T-shaped 1 0KV distribution line based on on-pole switch, comprises the steps:
Step 1, every 10KV distribution line is divided into multistage, and an on-pole switch is set on every section of circuit, and two 10KV distribution lines intersect T-shaped structure, all have an on-pole switch on every section of circuit of T-shaped structure;
Step 2,10KV distribution wire starts power supply, and the controller of each on-pole switch reads respectively the current value of each section of distribution line;
Step 3, when T-shaped structure is positioned at the on-pole switch of T node lower position dL n when the current value reading is greater than setting valve, perform step 4; If not, perform step 2;
Step 4, reads on-pole switch dL n+1 current value, in the time that the current value reading is greater than setting valve, execution step 2; In the time that the current value reading is less than setting valve, execution step 5;
Step 5, reads on-pole switch dL n-1a with dL n-1b current value, when reading on-pole switch dL n-1a or dL n-1b current value while being greater than setting valve, dL n tripping operation, open failure line circuit.
As preferably, described setting valve is 1.3 times of CT no-load voltage ratio.
The invention has the beneficial effects as follows:
T-shaped distribution line of the present invention is provided with three on-pole switchs, in the time that T-shaped structure breaks down, not only to consider the current value of the on-pole switch of this section, also consider other two on-pole switchs of T-shaped structure and the current value of a rear circuit on-pole switch, whether their current value meets the demands as the barring condition of adjacent elements, disengagement failure circuit rapidly and sensitively.Method of the present invention is in the time that the power supply mode of circuit changes; do not need to recalculate setting valve; the far-end of circuit and near terminal fault all can quick break switch; as long as the CT no-load voltage ratio of on-pole switch does not change; after the protection domain of on-pole switch or direction change; do not need to readjust setting valve, while having avoided fault, protect the possibility of tripping or malfunction.The present invention can solve on-pole switch in the supply line protection problems such as loaded down with trivial details, accommodation mode ability of adjusting effectively, has to adjust simply, and the setting valve of action is low, failure removal fast, the feature of not malfunction.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of one embodiment of the present invention;
Fig. 2 is method flow diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in Figure 1, in the present embodiment, the distribution line of A transformer station is by on-pole switch DL1, DL2, DL n-1a,dL n,dL n+1be divided into L 1, L 2, L n-1, L n, L n+1five sections.The distribution line of B transformer station is by DL3, DL n-1bbe divided into L 3, L n-1two sections, the T-shaped structure of the crossing composition of distribution line of B transformer station and A transformer station.
In the time of normal operation, on-pole switch DL n-1bdisconnect the power supply L of A transformer station 1, L 2, L n-1, L n, L n+1five sections of line loads; The power supply L of B transformer station 3section line load.When A station, on-pole switch DL closes n-1b, the protection domain that DL2 post is opened dwindles, and direction of current is reverse; on-pole switch DL3 protection domain expands; therefore protection domain or the direction opened because of post change, and former protection definite value can not adapt to new power supply mode, protect tripping or malfunction all likely to occur when fault.
Based on above-mentioned situation, the present invention proposes the detection method that does not need to readjust setting valve, as shown in Figure 2, fault detection method of the present invention adopts following steps:
Step 1, every 10KV distribution line is divided into multistage, and an on-pole switch is set on every section of circuit, and two 10KV distribution lines intersect T-shaped structure, all have an on-pole switch on every section of circuit of T-shaped structure;
Step 2,10KV distribution wire starts power supply, and the controller of each on-pole switch reads respectively the current value of each section of distribution line;
Step 3, when T-shaped structure is positioned at the on-pole switch of T node lower position dL n when the current value reading is greater than setting valve, perform step 4; If not, perform step 2;
Step 4, reads on-pole switch dL n+1 current value, in the time that the current value reading is greater than setting valve, execution step 2; In the time that the current value reading is less than setting valve, execution step 5;
Step 5, reads on-pole switch dL n-1a with dL n-1b current value, when reading on-pole switch dL n-1a or dL n-1b current value while being greater than setting valve, dL n tripping operation, open failure line circuit.
Above-mentioned setting valve is 1.3 times of CT no-load voltage ratio.
Work as circuit l n+1 certain some fault that is short-circuited, the on-pole switch on circuit dL n-1a (or DL n-1b ) , dL n, dL n+1 experience fault current simultaneously, dL n controller automatic blocking.As circuit L nthe end point fault that is short-circuited, only have on-pole switch dL n-1a (or DL n-1b ) , dL n experience fault current, and dL n+1 do not flow through fault current.As circuit L n-1the end point fault that is short-circuited, only have on-pole switch dL n-1a (or DL n-1b )experience fault current, and dL n+1, dL n do not flow through fault current.
As distribution line DL 1switch disconnects, and all part of paths change B transformer station power supply L1, L into by A transformer station 2, l n-1a , L n, l n+1 on five sections of circuits, the protection definite value of DL need recalculate and adjusts to the electrical distance of fault electricity its protection setting valve that changes because of power supply point; If overcurrent is too short actuation time, the fluctuation of distribution customer charge will cause false tripping, form power-off event.The present invention increases detection for this reason dL n-1a, dL n-1b and DL n+1 whether the electric current of switch reaches dL n trip Logic is as the barring condition of adjacent elements, once on-pole switch DL n on the electric current of experiencing of protective device be greater than 1.3 times of CT no-load voltage ratio, detect simultaneously dL n-1a, (or dL n-1b )electric current be greater than setting valve and DL detected n+1 electric current be less than setting valve dL n without delay tripping; this protection is because starting current is little, actuation time is short; can excise soon and with sensitivity the line fault that various faults are brought; can avoid reliably again the misoperation of other section of line fault simultaneously, change selectivity, the sensitivity solution of existing relay protection setting and failure removal that current value coordinate differential by the time.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, other amendments that those of ordinary skill in the art make technical scheme of the present invention or be equal to replacement, only otherwise depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of claim scope of the present invention.

Claims (2)

1. a fault detection method for the T-shaped 1 0KV distribution line based on on-pole switch, is characterized in that: comprise the steps:
Step 1, every 10KV distribution line is divided into multistage, and an on-pole switch is set on every section of circuit, and two 10KV distribution lines intersect T-shaped structure, all have an on-pole switch on every section of circuit of T-shaped structure;
Step 2,10KV distribution wire starts power supply, and the controller of each on-pole switch reads respectively the current value of each section of distribution line;
Step 3, when T-shaped structure is positioned at the on-pole switch of T node lower position dL n when the current value reading is greater than setting valve, perform step 4; If not, perform step 2;
Step 4, reads on-pole switch dL n+1 current value, in the time that the current value reading is greater than setting valve, execution step 2; In the time that the current value reading is less than setting valve, execution step 5;
Step 5, reads on-pole switch dL n-1a with dL n-1b current value, when reading on-pole switch dL n-1a or dL n-1b current value while being greater than setting valve, dL n tripping operation, open failure line circuit.
2. the fault detection method of a kind of T-shaped 1 0KV distribution line based on on-pole switch according to claim 1, is characterized in that: described setting valve is 1.3 times of CT no-load voltage ratio.
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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Citations (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
CN102270836A (en) * 2011-01-30 2011-12-07 武汉百叡电力技术有限公司 Wide-area over-current protection method and system for power distribution network
CN102761108A (en) * 2012-07-18 2012-10-31 积成电子股份有限公司 Logic operation-based distributed feeder automatization fault judgment method
CN102790383A (en) * 2012-08-20 2012-11-21 山东大学 Automatic rapid protection control method of novel feeder
CN102830328A (en) * 2012-08-23 2012-12-19 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

Patent Citations (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
CN102270836A (en) * 2011-01-30 2011-12-07 武汉百叡电力技术有限公司 Wide-area over-current protection method and system for power distribution network
CN102761108A (en) * 2012-07-18 2012-10-31 积成电子股份有限公司 Logic operation-based distributed feeder automatization fault judgment method
CN102790383A (en) * 2012-08-20 2012-11-21 山东大学 Automatic rapid protection control method of novel feeder
CN102830328A (en) * 2012-08-23 2012-12-19 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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