Stable status zero-sequence current increase and assistance device and method

A zero-sequence current and zero-sequence voltage technology, which is applied in the field of steady-state zero-sequence current booster devices, can solve problems such as small fault electrical magnitudes that are difficult to detect, shorten fault processing time, strengthen fault degrees, and improve transition resistance The effect of resistive capacity
CN101055986AInactive Publication Date: 2007-10-17UNIV OF JINAN
0 Cites 20 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF JINAN
Publication Date
2007-10-17
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a steady-state zero-sequence current increase-support apparatus and method. It has solved the shortcoming that the system fault electric amplitude of its own is small and difficult to detect, which occurs in the exsiting method of using the steady-state component in route selection and positioning. It has advantages such as transient amplification of the fault signal steady-state component after the single-phase ground fault occurs in the power network, which allows the route selection and positioning device based on the single-phase ground fault steady-state quantity, to accurate position, so at to achieve the purpose of positioning and route selection. Its structure is that: it includes a protected bus of the distribution system, and a steady-state zero-sequence current increase-support apparatus installed on the bus, which is connected to a voltage transformer, while the voltage transformer is connected to the bus; the increase-support apparatus is composed of a power capacitor group, on-off switches and a control device which monitors whether the single-phase ground fault occurs in the distribution system, while the power capacitor group help to increase the ground current, and the control device controls the on-off state of the power switch control group through the on-off switches.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a grounding fault detection technology in a power system, in particular to a steady-state zero-sequence current boosting device and method for a neutral point ungrounded or arc suppression coil grounded system. Background technique

[0002] At present, for the power distribution system in operation, since the neutral point of the system is not grounded or grounded through the arc suppression coil, no short-circuit loop will be formed after a single-phase ground fault occurs, and only a small zero-sequence current caused by the distributed capacitance of the system. Various devices for finding single-phase ground faults at home and abroad are based on these relatively small quantities as the judgment basis, and the misjudgment rate is relatively large. In this regard, there is no accurate and reliable microcomputer line selection device that can act on tripping at present.

[0003] Universities and manufacturers at home and abr...

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