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Grounding protection method for power generator and auxiliary power for accurate partition of thermal power plant

A technology for ground protection and generators, which is applied in emergency protection circuit devices for limiting overcurrent/overvoltage, protection that responds to fault currents, emergency protection circuit devices, etc., can solve the problems of few applications in domestic power plants, To achieve the effect of reducing the scope of failure, improving reliability and ensuring continuous operation

Pending Publication Date: 2022-04-12
CEEC JIANGSU ELECTRIC POWER DESIGN INST
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] For the grounding operation mode of the power consumption of the power plant, it is not described in detail in DL / T 5153-2014 "Technical Regulations for Design of Power Consumption of Thermal Power Plants", and it is rarely used in domestic power plants

Method used

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  • Grounding protection method for power generator and auxiliary power for accurate partition of thermal power plant
  • Grounding protection method for power generator and auxiliary power for accurate partition of thermal power plant
  • Grounding protection method for power generator and auxiliary power for accurate partition of thermal power plant

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Embodiment 1

[0025] The primary wiring of a thermal power plant in an industrial park in Yantai, Shandong, such as Figure 1-2 As shown, the 50MW pumped back steam turbine generator set is transmitted to the 110kV bus section of the existing 110KV main substation in the industrial park through a 10 / 110kV step-up transformer, and a 110kV cable line, and a 35 / 10kV starting backup power supply for the factory is installed. The high-voltage start / standby transformer uses 35kV cable lines to lead from the 35kV bus section of the substation in the industrial park.

[0026] In terms of primary system configuration: In order to provide the reliability of the factory power, and the generator failure will not affect the stable operation of the factory power, a generator outlet circuit breaker is installed between the generator and the main transformer. Due to the large capacity of the thermal power plant’s external heat supply boilers and the large scale of the plant power system, the total capaciti...

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Abstract

The invention discloses a power generator and plant power grounding protection method for accurate partitioning of a thermal power plant, which is used for distinguishing internal and external grounding faults of a power generator and each plant branch and forming a set of innovative whole-plant grounding protection scheme in combination with flexible CT (Current Transformer), PT (Potential Transformer), generator-transformer group protection and low-current wiring line selection devices. Any grounding fault point of the whole plant can be reliably judged, the power failure range is reduced through accurate protection action, and reliable continuous operation of a generator and power for the plant is ensured. According to the power generator and service power grounding protection method for accurate partitioning of the thermal power plant, the power supply reliability of a service power system of the thermal power plant is improved, so that the heat supply reliability is improved, the heavy loss of heat consumers caused by heat supply interruption is reduced, and the economic benefits of the thermal power plant are also improved.

Description

technical field [0001] The invention relates to a generator used for precise subdivision of a thermal power plant and a grounding protection method for utility power, belonging to the technical field of electric power generation in the electric power industry. Background technique [0002] There are three main ways of generator grounding: the neutral point of the generator is not grounded, the neutral point of the generator is grounded through high resistance, and the neutral point of the generator is grounded through the arc suppressing coil. There are three main grounding methods for the high-voltage plant power system of a thermal power plant: no grounding, high-resistance grounding, and low-resistance grounding. [0003] The neutral point ungrounded system is allowed to run for a period of time when the capacitive current to the ground is small, and the reliability of the power supply is guaranteed. However, once the capacitive current exceeds the allowable value, the ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H7/22H02H7/06H02H9/08H02H3/16
Inventor 陈海良孙若笛高雅潘晓烨殷佳尉翁海峰梁文军
Owner CEEC JIANGSU ELECTRIC POWER DESIGN INST
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