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Intelligent auto-reclosing valve suitable for bus of 220kV voltage grade or above

An automatic reclosing and voltage level technology, applied in electrical components, emergency protection circuit devices, etc., can solve the problem of not having the ability to identify transient faults and permanent faults, and achieve significant practical significance, easy implementation, and technical methods. simple effect

Inactive Publication Date: 2009-03-11
XIAN XIRUI CONTROL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is to provide an intelligent automatic reclosing switch suitable for buses with a voltage level of 220kV and above, so as to overcome the problem that the prior art does not have the ability to identify transient faults and permanent faults, so it cannot be applied to the bus.

Method used

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  • Intelligent auto-reclosing valve suitable for bus of 220kV voltage grade or above
  • Intelligent auto-reclosing valve suitable for bus of 220kV voltage grade or above
  • Intelligent auto-reclosing valve suitable for bus of 220kV voltage grade or above

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: An intelligent automatic reclosing switch applicable to buses with a voltage level of 220kV and above, and a discrimination process in the case of single-phase grounding or two-phase grounding short circuit.

[0041] Step 1. When the busbar fails, the busbar protection action trips all the circuit breakers connected to the busbar for three phases, so as to quickly extinguish the arc and eliminate the instantaneous fault.

[0042] Step 2. Use bus differential protection, zero-sequence current and phase voltage to obtain the fault type of the fault, including AG, BG, CG, ABG, BCG, CAG, that is, single-phase to ground short circuit or two-phase to ground short circuit;

[0043] Step 3. Use the voltage transformer on the bus to obtain the voltage, first perform single-phase closing, and close the relevant power supply according to the following table

[0044] Fault type AG BG CG ABG BCG CAG Closing phase B or C C or A A or B C ...

Embodiment 2

[0052] Embodiment 2: An intelligent automatic reclosing switch applicable to buses with a voltage level of 220kV and above, and a discrimination process in the case of a two-phase short circuit.

[0053] Step 1. When the busbar fails, the busbar protection action trips all the circuit breakers connected to the busbar for three phases, so as to quickly extinguish the arc and eliminate the instantaneous fault.

[0054] Step 2. Use bus differential protection, zero-sequence current and phase voltage to obtain the fault types of the faults, which are AB, BC, and CA respectively, that is, two-phase short circuit.

[0055] Step 3. Use the voltage transformer on the bus to obtain the voltage, first perform single-phase closing, and close the relevant power supply according to the following table

[0056] Fault type AB BC CA Closing phase A or B B or C C or A

[0057] Then judge according to the formula, the condition for judging as a transient fault is:...

Embodiment 3

[0061] Embodiment 3: An intelligent automatic reclosing switch applicable to buses with a voltage level of 220kV and above, and a discrimination process in the case of a three-phase short circuit.

[0062] Step 1. When the busbar fails, the busbar protection action trips all the circuit breakers connected to the busbar for three phases, so as to quickly extinguish the arc and eliminate the instantaneous fault;

[0063] Step 2, using busbar differential protection, zero-sequence current and phase voltage, it is obtained that the fault type of the fault is ABC, that is, a three-phase short circuit (ABC) fault;

[0064] Step 3. According to the table below, turn on the relevant power supply to determine the nature of the fault (instantaneous or permanent).

[0065] Fault type ABC Closing phase any phase

[0066] For the discrimination of the nature of the three-phase short-circuit (ABC) fault, refer to the accompanying drawings, including the three situatio...

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Abstract

The invention relates to the field of an auto recloser of an electrical system, particularly relates to an intelligent type auto recloser which is applicable for a bus line with the voltage grade of 220 kV and more than 220kV. The invention aims at overcoming the problem that the prior art can not be applied on the bus line because of the failure of distinguishing temporary faults from permanent faults. The invention provides the technical proposal that the intelligent type auto recloser which is applicable for the bus line with the voltage grade of 220 kV and more than 220 kV is finished by making use of the following steps: 1. when the bus line is broken down, three phases of all circuit breakers that are connected with the bus line are tripped off through the bus-line protecting action so as to facilitate the fast arc extinction and ensure the temporary faults to be eliminated; 2. the bus-line differential protection, the zero-sequence current and the phase voltage are utilized to obtain fault types; 3. a relevant power supply is closed so as to distinguish fault properties (temporary or permanent); 4. the corresponding operations are carried out according to fault properties.

Description

technical field [0001] The invention relates to the field of automatic reclosing gates of power systems, in particular to an intelligent automatic reclosing gate suitable for buses with a voltage level of 220kV and above. Background technique [0002] Automatic reclosing is widely used on the power lines of the power system (including power supply lines and transmission lines), and it plays a role in improving the reliability of power supply and the stability of the power system. However, the automatic reclosing technology on the bus has not been practically applied. Once the bus fails, the power supply cannot be restored quickly. [0003] One of the important reasons why automatic reclosing is not used on the high-voltage bus is because the bus occupies an important position in the system, and the automatic reclosing that can be seen at present is blind reclosing, and does not have the ability to identify transient faults and permanent faults. The ability of failure, if it...

Claims

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Application Information

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IPC IPC(8): H02H7/22
Inventor 宋国兵贠保记葛耀中索南加乐
Owner XIAN XIRUI CONTROL TECH CO LTD
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