A disconnection alarm device and alarm method suitable for 6-35kv distribution network
A disconnection alarm and distribution network technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of people and animals being electrocuted, low response sensitivity, and low sensitivity
Active Publication Date: 2015-08-12
SHANDONG UNIV
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Problems solved by technology
If the line is disconnected and then falls to the ground (called a broken ground point fault), it will burn the land, ignite the forest, and cause more serious consequences such as electrocuting people and animals.
[0003] There are two situations for broken ground point faults: first, the ground point is on the load side, and there is no countermeasure in China; very low
For such a dangerous situation where a charged high-voltage line falls on the ground and involves personal safety, there is a 50% chance that there will be no response, and a 50% chance that the response sensitivity is very low. Therefore, no one knows about the landing of high-voltage lines in domestic rural areas for 4 or 5 days. Human and animal situations happen from time to time
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[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0039] The working principle of the disconnection detector 15: when the power distribution outlet is in normal operation, only the positive sequence component of the A-phase current Positive sequence component of phase B current Positive sequence component of phase C current Its vector diagram is shown in Figure 1(a), the three-phase currents are equal in magnitude, and the phase difference is 120°;
[0040] As shown in Figure 1(b), when the main line of the distribution line is disconnected, (taking phase A as an example), the current of the distribution line Indicates the phase A current, Indicates the phase B current, Indicates the C-phase current.
[0041] As shown in Figure 2(a), when the branch line of the distribution line breaks, the branch line current is Indicates the phase A current of the broken branch, Indicates the B-p...
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The invention discloses a wire-breakage alarming device and method suitable for a 6-35kV power distribution network. The device comprises a host machine which is installed on a transformer substation master-control room, wherein the host machine is connected with each wire-breakage detector through a three-core cable. An A-phase current mutual inductor and a C-phase current mutual inductor are installed on outgoing wires which are connected with a busbar, and the wire-breakage detectors are installed inside switch cabinets of the outgoing wires of the 6-35kV power distribution network respectively. The input ends of the wire-breakage detectors are connected with the A-phase current mutual inductor and the C-phase current mutual inductor of the corresponding outgoing wires respectively. Input currents of the wire-breakage detectors are secondary currents of the outgoing wire inductors and the host machine is used for supplying power to the wire-breakage detectors. The wire-breakage alarming device and method suitable for the 6-35kV power distribution network have the advantages that when wire breakage occurs on a main wire or branch wires on a 6-35KV circuit, an alarming signal of wire breakage of a certain outgoing wire is sent out and is transmitted to be scheduled through the device, and then maintenance personnel are reminded of conducting disposal timely.
Description
technical field [0001] The invention relates to a disconnection alarm device and an alarm method suitable for a 6-35kV distribution network. Background technique [0002] my country's 6-35kV distribution network is at the end of the power system, widely distributed, and exposed to nature. It is attacked by wind, sun, rain, ice, snow, lightning, etc., and disconnection faults occur from time to time. The disconnection fault causes a large amount of negative sequence current in the system, causing the motor to heat up or burn out. If the line is disconnected and then falls to the ground (called a broken line ground point fault), it will burn the ground, ignite the forest, and cause more serious consequences such as electrocuting people and animals. [0003] There are two situations for broken ground point faults: first, the ground point is on the load side, and there is no countermeasure in China; very low. For such a dangerous situation where a charged high-voltage line fa...
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IPC IPC(8): G01R31/02
Inventor 王慧桑在中
Owner SHANDONG UNIV