DC system short circuit protection device

A DC system and short-circuit protection technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of difficulty in setting DC current and time, long time to remove faults, and inability to realize automatic adjustment of operation mode, to overcome the disappearance of DC power. , the effect of protecting reliability and improving reliability
CN1402404AInactive Publication Date: 2003-03-12STATE GRID GANSU ELECTRIC POWER CORP +1
0 Cites 20 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
STATE GRID GANSU ELECTRIC POWER CORP
Publication Date
2003-03-12
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 protection device is suitable to the on-line protection of the short circuit failure at DC 220 voltage, + / - 110 voltage in power plants and transformer substations. The invention is realized through following steps. The detection circuit for the short circuit in the branch through the data collection circuit, A / D conversion circuit is connected to the industrial control computer. The detection circuit for the bus voltage through the data collection circuit, A / D conversion circuit is connected to the industrial control computer. The detection circuit for the state of the breaker through the optical isolation input circuit is connected to the industrial control computer. The current criterion is I is greater than or equal to Id, and the voltage criterion is U is less than or equal to Ud.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a short-circuit protection device, which belongs to a short-circuit protection device of a DC system suitable for on-line protection of short-circuit faults in power plants and substations with DC 220 volts and ±110 volts. Background technique

[0002] The DC system is the power source for control, protection, signal and automatic devices in the power system, and its reliability is directly related to the safety of the power system. However, at present, the traditional fuse method is still used for fault removal after a short circuit in the DC system, and due to a series of legacy problems such as the dispersion and thermal brittleness of the fuse, the leapfrog action of the fuse to the total fuse of the DC power supply has repeatedly occurred. Cause the DC power supply to disappear, lead to the rapid spread and expansion of power system accidents, and cause catastrophic equipment damage and system accidents in the power system...

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