Neutral point grounding resistor plant for electrical power system

A technology of neutral point grounding and grounding resistors, applied in the direction of resistors, circuit devices, emergency protection circuit devices, etc., can solve problems such as inability to identify instantaneous faults, affect power reliability, and power outages for users, so as to reduce power outage maintenance The number of times, prolonging life, and solving the effects of aging

Active Publication Date: 2009-08-05
JIANGSU ELECTRIC POWER CO +1
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  • Abstract
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Problems solved by technology

[0003] After searching the prior art, it is found that the Chinese patent application number 200710108451.7 and the invention patent application with the publication number CN101055301A have recorded a "neutral point grounding resistor monitoring device". The temperature is monitored to determine whether the neutral point grounding resistor is in normal operation. If the current or temperature of the neutral point grounding resistor exceeds the thresho

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  • Neutral point grounding resistor plant for electrical power system
  • Neutral point grounding resistor plant for electrical power system

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Embodiment Construction

[0014] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

[0015] like figure 1 As shown, this embodiment includes: grounding transformer 1, isolating switch 2, voltage transformer 3, circuit breaker 4, controller 5, grounding resistor 6 and current transformer 7, wherein: the input end of grounding transformer 1 is connected to the power system The neutral point output terminal of the grounding transformer 1 is connected to the grounding resistor 6 through the isolation switch 2 and the circuit breaker 4 in turn, the other end of the grounding resistor 6 is grounded, and one input terminal of the voltage transformer 3 is con...

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Abstract

The invention provides a neutral point grounding resistor integrated device for a power system, belonging to the field of power system distribution network technology. The integrated device comprises a grounding transformer, an isolation switch, a voltage transformer, a circuit breaker, a controller, a grounding resistor and a current transformer. When the grounding does not occur, the grounding resistor is not accessed and no current passes by the grounding resistor, thus completely solving the ageing problem caused by the temperature increment during the normal running process and greatly prolonging the service life of the equipment; and after the grounding occurs, the grounding resistor is accessed with time delay, thus avoiding the transient grounding. Compared with the prior art, the integrated device can reduce the shutdown time by about a half; after the grounding resistor is accessed, the grounding resistor is cut off after a certain time, thus preventing the grounding resistor from being burned and ensuring the safety of the equipment.

Description

technical field [0001] The invention relates to a device in the technical field of power distribution network, in particular to a complete set of neutral point grounding resistors in a power system. Background technique [0002] The neutral point grounding resistor, referred to as the grounding resistor, refers to the power resistor installed between the neutral point and the grounding point of the power grid, and is a grounding protection device. With the rapid expansion of the scale of urban power grids, a large number of power lines use cable lines. When a ground fault occurs in the cable line, its ground current is relatively large, and it often develops into a permanent ground fault. The advantage of the grounding method through the grounding resistor is that it can limit the arc grounding overvoltage, which is beneficial to quickly and accurately cut off the faulty line. The disadvantage is that it cannot escape the instantaneous grounding, and every time a fault occu...

Claims

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Application Information

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IPC IPC(8): H02H9/08H02H7/26H02H3/26H01C13/02
Inventor 王建忠李长益贾俊
Owner JIANGSU ELECTRIC POWER CO
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