Device and method for finding faults of loop current in direct current system

Abstract

The invention discloses a device and method for searching for a loop channeling electric fault in direct current systems. The device comprises an insulation monitoring device, wherein the insulation monitoring device comprises a processer, a bus connection interface, an axle type resistance control circuit, an adjustable resistance control circuit and a current transformer. The method includes the steps that according to the difference between the voltage to ground of the positive electrode of the first direct current system and the voltage to ground of the positive electrode of the second direct current system, and therefore whether the loop channeling electric fault exists between the two direct current systems or not is judged; when the loop channeling electric fault exists between the two direct current systems, an adjustable resistor is connected in according to the voltages to ground of the positive electrodes and the negative electrodes of the direct current systems, and the resistance value of the adjustable resistor is adjusted; current data acquisition is conducted on the current transformer connected to a feeder wire, and the feeder wire where the loop channeling electric fault occurs is positioned according to the preset change rules and the change rules of the obtained current data. By means of the device and method, the loop channeling electric fault can be found and positioned rapidly, accurately and safely. The device and method can be widely applied to the field of electric systems.

Description

technical field

[0001] The invention relates to a direct current system fault finding technology, in particular to a device and method for finding a direct current system loop current fault finding. Background technique

[0002] At present, during the operation of the DC power system of the substation, there will be a loop fault between the two DC systems, which will affect the normal operation of the DC power system of the substation. In order to ensure the reliable operation of the DC power system of the substation, the staff must detect the loop current fault in time and accurately select and locate the line. However, the existing detection methods basically rely on manual operations, so this will not only increase the workload of the staff, but also have low efficiency. In addition, there are still hidden dangers in the existing detection methods, such as the AC signal injection method. Contents of the invention

[0003] In order to solve the above-mentioned technica...

Examples

Embodiment Construction

[0049] Such as figure 1 As shown, a DC system loop current fault finding device includes insulation monitoring equipment, the insulation monitoring equipment includes a processor, and the processor is respectively connected with a bus connection interface, a bridge resistance control circuit, an adjustable resistance control circuits and current transformers. The processor is also connected with a host computer, and the processor is connected with the host computer through communication.

[0050] As a further preferred embodiment, the bridge circuit control circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first switch, and a second switch;

[0051] One end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to a connection end of the second switch, so The other connection end o...

technical field

[0001] The invention relates to a direct current system fault finding technology, in particular to a device and method for finding a direct current system loop current fault finding. Background technique

[0002] At present, during the operation of the DC power system of the substation, there will be a loop fault between the two DC systems, which will affect the normal operation of the DC power system of the substation. In order to ensure the reliable operation of the DC power system of the substation, the staff must detect the loop current fault in time and accurately select and locate the line. However, the existing detection methods basically rely on manual operations, so this will not only increase the workload of the staff, but also have low efficiency. In addition, there are still hidden dangers in the existing detection methods, such as the AC signal injection method. Contents of the invention

[0003] In order to solve the above-mentioned technica...

Examples

Embodiment Construction

[0049] Such as figure 1 As shown, a DC system loop current fault finding device includes insulation monitoring equipment, the insulation monitoring equipment includes a processor, and the processor is respectively connected with a bus connection interface, a bridge resistance control circuit, an adjustable resistance control circuits and current transformers. The processor is also connected with a host computer, and the processor is connected with the host computer through communication.

[0050] As a further preferred embodiment, the bridge circuit control circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first switch, and a second switch;

[0051] One end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to a connection end of the second switch, so The other connection end o...

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