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Intelligent identification method of 10kV line short-circuit fault voltage

A fault voltage and intelligent identification technology, applied in the direction of measuring current/voltage, measuring electrical variables, and using digital measurement technology to measure, etc., can solve problems such as complex hardware circuits, inability to warn in time, tight internal space, etc., and achieve single software functions , good social benefits, and the effect of improving the detection rate

Active Publication Date: 2017-05-31
JIANGSU DAYBRIGHT INTELLIGENT ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1) The FTU cannot judge whether the 10kV power supply PT is faulty, and cannot give early warning in time, because the FTU collects the 10kV voltage signal through the EVT module. FTU cannot achieve fault isolation;
[0007] 2) The failure of the FTU's internal hardware detection circuit cannot be detected by the relay scheme. In this case, the FTU cannot achieve fault isolation;
[0008] 3) Due to the relatively tight internal space of the FTU, if the relay detection scheme is adopted, the hardware circuit is complicated, the debugging is complicated, and the installation space is tight, especially the internal space of the cover-type FTU is even more tight;

Method used

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  • Intelligent identification method of 10kV line short-circuit fault voltage
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  • Intelligent identification method of 10kV line short-circuit fault voltage

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with accompanying drawing.

[0043] figure 2 The schematic diagram of the primary wiring of the 10kV distribution network is shown, with figure 2 A brief description of the 10kV line short-circuit fault voltage detection technology, figure 2 CB1 and CB2 are the reclosers of the two substations, S is the switch on the pole of the subsection point, and L is the switch on the pole of the ring network point.

[0044] Before the 10kV line is powered on, the switch on the pole of the ring network point is in the opening state. figure 2 There is no electricity on side A and side B on the medium 10kV line. 10kV line power transmission starts, CB1 closes, FTU1 judges after X timing (7 seconds in general), confirms that there is no fault on the power supply side (that is, immediately cuts off power after no incoming power), and issues a closing command. Such as figure 2 , at this time the switch on the...

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Abstract

The invention provides an intelligent identification method of 10kV line short-circuit fault voltage. The method is characterized in that a double-CPU feeder terminal formed by a main CPU and a detecting CPU is built, the residual voltage or instantaneous voltage during a 10kV line short-circuit fault is fast identified through the feeder terminal, a locking condition is provided for feeder terminal fault isolation, intelligent diagnosing can be performed and corresponding fault information can be provided when a 10kV power supply voltage transformer outside the feeder terminal and a related detecting loop fail, and a user can be timely reminded to turn on or turn off complete equipment to guarantee that the equipment is in a good operation state. By the intelligent identification method good in social benefit, local feeder automatic fault isolation and power restoration success rate increasing are benefited.

Description

technical field [0001] The invention relates to a detection technology for a line short-circuit fault voltage in an on-site feeder automation in the field of intelligent distribution networks, in particular to an intelligent identification method for a 10kV line short-circuit fault voltage. Background technique [0002] At present, in the domestic on-site feeder automation field, the most widely used feeder automation technology adopts the on-site coincidence mode. The executive body to complete fault isolation and restore power supply is mainly composed of voltage-time feeder terminal (FTU) or similar products, electromagnetic The pole-mounted load switch and the power transformer on both sides will be referred to as "pole-mounted switch complete set" in the future, and the power transformer will be referred to as "PT" for short. [0003] In the prior art, the "feeder terminal" uses a secondary voltage transformer installed inside it, which converts the voltage signal outpu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
CPCG01R19/2503
Inventor 高明
Owner JIANGSU DAYBRIGHT INTELLIGENT ELECTRIC CO LTD
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