Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Capacitive grounding current distributed compensation method and device for medium-voltage power supply system

A technology of ground capacitance current and decentralized compensation, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection circuit devices, etc. for limiting overcurrent/overvoltage, can solve the problems of low power supply reliability and achieve continuous solutions The effect of increasing capacity, reducing generation and development, and ensuring reliability

Active Publication Date: 2010-10-27
JILIN PROVINCE ELECTRIC POWER RES INST OF JILIN ELECTRIC POWER CO LTD +2
View PDF5 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method and device for decentralized compensation of ground capacitive current in a medium-voltage power supply system to solve the problem of increasing the capacity of the arc-suppression coil in the neutral point ungrounded power supply system of the medium-voltage power supply system and the power supply of the neutral point ungrounded power grid For the problem of low reliability, the technical solution adopted by the present invention is: scatteredly install the distributed compensation ground capacitance current transformer on the line with relatively large ground capacitance current in the system, and the distributed compensation ground capacitance current transformer installed on each line Only compensate the ground-to-ground capacitance current of the line where the line is located, and the compensation capacity is 1.1 times the ground-to-ground capacitance current of the line where the line is located. The sum of the distributed compensation ground-to-ground capacitance current of the entire power grid is 40-60% of the system's ground-to-ground capacitance current, and the rest passes through the consumption of the substation. Arc device for comprehensive compensation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Capacitive grounding current distributed compensation method and device for medium-voltage power supply system
  • Capacitive grounding current distributed compensation method and device for medium-voltage power supply system
  • Capacitive grounding current distributed compensation method and device for medium-voltage power supply system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] Dispersely install the decentralized compensation ground capacitance current transformer on the line with relatively large ground capacitance current in the system. The decentralized compensation ground capacitance current transformer installed on each line only compensates the ground capacitance current of the line where it is located, and the compensation capacity is The ground-to-ground capacitance current of the line is 1.1 times, and the sum of the ground-to-ground capacitance current of the entire grid decentralized compensation is 40-60% of the system's ground-to-ground capacitance current, and the rest is comprehensively compensated through the arc suppression device of the substation.

[0018] The device that realizes above-mentioned technical scheme of the present invention to take is:

[0019] The substation is connected with the arc-suppressing coil for centralized compensation of the substation, and the decentralized compensation ground capacitance current t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a capacitive grounding current distributed compensation method for a medium-voltage power supply system, which belongs to the technical field of the capacitive grounding current compensation of a neutral non-grounding power supply system. In the method, capacitive grounding current distributed compensation transformers are arranged on lines, with relatively greater capacitive grounding currents, of the system in a distributed way, and only compensate the capacitive grounding currents of the corresponding lines, wherein the compensation capacity of each capacitive grounding current distributed compensation transformer is 1.1 times the capacitive grounding currents of the corresponding lines; and 40 to 60 percent of the capacitive grounding currents of the system is compensated by the capacitive grounding current distributed compensation of the whole power grid, and the other is comprehensively compensated by arc extinguishing devices of transformer substations. The capacitive grounding current distributed compensation method has the advantages that: the capacitive grounding current distributed compensation transformers are adopted, so arrangement is simple and maintenance is unnecessary; operation is simple and the capacitive grounding current is compensated in real time; and the power supply reliability of the power grid is radically improved.

Description

technical field [0001] The invention is applicable to the technical field of ground-to-ground capacitance current compensation in a neutral point ungrounded power supply system. Background technique [0002] In the neutral point ungrounded power supply system, when the capacitance current of the system to the ground increases, once the single-phase of the line is grounded, the arc will not be able to stop the arc itself, and the overvoltage generated by the arc re-ignition will endanger the insulation of the sound phase and cause a two-phase short circuit Faults, for single-phase grounding faults, it is not uncommon to cause distribution network accidents, causing insulation breakdown, bushing burst, two-phase short circuit, and even causing the switchgear of the substation to be "fired"; for this reason, the existing neutral point is not Grounded power supply systems usually use arc suppression coils for grounding at the neutral point, and compensate the capacitance current...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/08
Inventor 列剑平敖明孙桂新郑良华
Owner JILIN PROVINCE ELECTRIC POWER RES INST OF JILIN ELECTRIC POWER CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products