Method for realizing fault location based on FTUs (Feeder Terminal Units) and fault indicators
A fault indicator and fault location technology, applied in the fault location, fault detection according to conductor type, instrument, etc., can solve problems such as small fault current, weak fault signal, difficult fault detection, line selection, and positioning, and achieve reliability High and low cost effect
Inactive Publication Date: 2018-03-27
CHENGDU HANDU TECH
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is that when a small current single-phase grounding fault occurs in the system, the fault current is very small and the fault signal is weak, which makes fault detection, line selection, and positioning very difficult. The purpose is to provide fault indicators based on FTU The method of realizing fault location solves the problem that when a small current single-phase ground fault occurs in the system, the fault current is very small and the fault signal is weak, which makes fault detection, line selection and location very difficult
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Embodiment 1
[0023] The method for realizing fault location based on FTU and fault indicator of the present invention includes the following steps:
[0024] A: Segment the distribution ring network, match the fault indicator for each segment, and connect the fault indicator to the control center of the distribution ring network;
[0025] B: Monitor the working status of each fault indicator. If the fault indicator is working normally, go to step B. If the fault indicator shows a line fault, record the fault information and start the feeder terminal device of the corresponding line. Go to step C for the next step Processing and calculation;
[0026] C: T after the start of the feeder terminal device calculation failure 0 The amplitude of internal transient zero sequence current I f ; Compare the transient zero-sequence current amplitude I at each detection point on each route f , Select the transient zero sequence current amplitude I f The largest line
[0027] D: According to the change of the tra...
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The invention discloses a method for realizing fault location based on FTUs (Feeder Terminal Units) and fault indicators. The method comprises the following steps that: a power distribution looped network is segmented, each segment is matched with a fault indicator, the fault indicators are connected into the control center of the power distribution looped network; the working status of each faultindicator is monitored, if the fault indicators work normally, step B is repeated, if a certain fault indicator displays that a fault occurs on a line, fault information is recorded, the feeder terminal unit of the corresponding line is started, the method shifts to a next step of processing and calculation; the amplitude If of transient zero-sequence current within T0 after the fault occurs is calculated; the amplitude If of the transient zero-sequence current of each detection point on each line is compared with each other, and a line with the highest transient zero-sequence current amplitude If is selected; and small-current grounding fault location is performed according to the change condition of the amplitude of the transient zero-sequence current of each detection point on the selected line.
Description
Technical field [0001] The invention relates to a fault location method, in particular to a method for implementing fault location based on an FTU and a fault indicator. Background technique [0002] Feeder terminal equipment (abbreviated as FTU), has remote control, remote signaling, fault detection functions, and communicates with the distribution automation master station to provide the operation status of the distribution system and various parameters, that is, the information required for monitoring and control, including switch status and electrical energy parameters , Phase-to-phase fault, ground fault and fault parameters, and execute the command issued by the power distribution master station to adjust and control the power distribution equipment, realize the functions of fault location, fault isolation and fast power restoration in non-fault areas. FTU is an intelligent terminal device installed in the power distribution room or feeder. It can communicate with the remo...
Claims
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IPC IPC(8): G01R31/02G01R31/08
CPCG01R31/086G01R31/50
Inventor 代辉李御空刘永强温海康李文超
Owner CHENGDU HANDU TECH