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Fault removal method for dual-power supply line

A dual power supply and line fault technology, applied to circuit devices, emergency protection circuit devices, electrical components, etc., can solve problems such as failure to correctly remove faults, and achieve the effect of improving accuracy

Pending Publication Date: 2022-03-11
GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is not suitable for power supply-load-power dual power supply conditions, and the fault cannot be removed correctly; when a fault occurs at a certain point of the line under the dual power supply mode, it is urgent to remove the fault location correctly

Method used

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  • Fault removal method for dual-power supply line
  • Fault removal method for dual-power supply line
  • Fault removal method for dual-power supply line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] refer to figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 with Image 6 , is the first embodiment of the present invention, and this embodiment provides a method for removing a fault in a dual power supply line.

[0040] Connect each ring network cabinet through the cable junction box M to form a path; ensure the normal operation of the dual power supply lines.

[0041] The communication between the tested switch, the left adjacent switch and the right adjacent switch is normal; the tested switch, the left adjacent switch and the right adjacent switch are respectively in the closed position; the tested switch, The state of the adjacent switch on the left and the adjacent switch on the right is detected. The first state is that the relay protection device is not activated, and the second state is that the relay protection device is activated to determine whether there is a short circuit between the lines;

[0042] The dual power supply line fails, and the te...

Embodiment 2

[0061] refer to figure 1 with figure 2 , is the second embodiment of the present invention, and this embodiment takes the fault at point F3 of the 10kV Dangyan line as an example.

[0062] Adjacent switches refer to switches that have a direct electrical connection relationship. refer to figure 2 , the adjacent switches of switch 3 are 2 and 4, but switches 1 and 5 are not.

[0063] The switch that needs fault removal is "Switch 000 of Ring Main Unit No. 1 on Dangcai Line (Switch 3)", that is, a certain switch in the principle refers to "Switch 000 of RMU No. 1 on Dangcai Line".

[0064] The adjacent switch refers to the switch with direct electrical connection relationship. The adjacent node switch on the left side of "Dangcai Line No. 1 Ring Main Unit 000 Switch" includes "Dangcai Line No. 1 Ring Main Unit 011 Switch (Switch 2)", " Dangcai Line No. 1 RMU 001 switch (switch 7)", "Dangcai Line No. 1 RMU 002 switch (switch 8)", "Dangcai Line No. 1 RMU 003 switch", "Dangca...

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Abstract

The invention discloses a dual-power supply line fault removal method, which comprises the following steps of: butting each ring main unit through a cable junction box to form an access; the communication among the tested switch, the left adjacent switch and the right adjacent switch is normal; the two switches are in a switching-on position; the states of the detected switch, the left adjacent switch and the right adjacent switch are detected, and whether short circuit occurs between lines is judged; when the dual-power supply line breaks down, the detected switch detects that the phase current is larger than a setting fixed value or the zero-sequence current is larger than the setting fixed value, and after intelligent distributed fault tripping time, only one of the adjacent switches on the left side and the right side of the detected switch is in a first state; and judging that the detected switch is a fault removal switch. According to the invention, under the condition that a fault occurs at a certain point of the line in a dual-power supply mode, the specific position of the fault point on the line can be easily judged, and the correctness of removing the fault point on the line is improved.

Description

technical field [0001] The invention relates to the technical field of line faults, in particular to a dual power supply line fault removal method. Background technique [0002] After the power line fails, the relay protection device closest to the fault point on the power point side is usually used to remove the fault. This method judges the action behavior of the single-side switch protection device, which is suitable for power supply-load, that is, under the condition of single power supply. This method is not suitable for power supply-load-power dual power supply conditions, and the fault cannot be removed correctly; when a fault occurs at a certain point of the line under the dual power supply mode, it is urgent to remove the fault location correctly. Contents of the invention [0003] The purpose of this section is to outline some aspects of embodiments of the invention and briefly describe some preferred embodiments. Some simplifications or omissions may be made in...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H1/00
CPCH02H7/26H02H1/0007
Inventor 宁楠陈怀蔺金正饶赟王磊杨政校陈克洋
Owner GUIZHOU POWER GRID CO LTD