Insulation monitoring method for switching type direct current system

A DC system, insulation monitoring technology, applied in the direction of grounding resistance measurement, etc., can solve problems such as abnormality, inability to accurately monitor busbar or load bipolar insulation, etc.

Inactive Publication Date: 2013-11-06
DELTA GREENTECH CHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a switch-type insulation monitoring method, which is used to solve the problem that the prior art cannot accurately monitor the busbar or the bipolar insulation abnormality of the load

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  • Insulation monitoring method for switching type direct current system
  • Insulation monitoring method for switching type direct current system
  • Insulation monitoring method for switching type direct current system

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Embodiment Construction

[0026] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0027] Please refer to attached drawings 1-5. It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of ​​the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be c...

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Abstract

The invention provides an insulation monitoring method for a switching type direct current system. The insulation monitoring method for the switching type direct current system comprises measuring the bus voltage; measuring the voltage to the ground from a positive pole and a negative pole of a bus; measuring insulation resistance to the ground from the positive pole and the negative pole of the bus according to the voltage to the ground from the positive pole and the negative pole of the bus; judging whether the insulation resistance to the ground from the positive pole and the negative pole of the bus is less than an insulation alarm valve value or not; judging the bus to be free of insulation fault if not; outputting or storing information of bus insulation abnormal alarm and abnormal polarity insulation resistance if yes; starting measuring of the insulation resistance to the ground from a positive pole and a negative pole of a load shunt circuit. According to the insulation monitoring method for the switching type direct current system, the insulation resistance to the ground of the positive poles and the negative poles of the bus and the load shunt circuit can be accurately measured, the accuracy is less than 5%, and an HVDC (High Voltage Direct Current) requirement for outputting suspension cannot be damaged.

Description

technical field [0001] The invention relates to an online DC insulation monitoring method, in particular to occasions requiring online real-time insulation monitoring, such as high-voltage direct current (hereinafter referred to as HVDC) systems for communication, electric vehicle charging systems, and DC in intelligent insulation monitoring instruments. Insulation monitoring methods. Background technique [0002] As a new type of power supply for the communication room of the modern Internet data center, the HVDC system is a huge multi-branch power supply network that uses a suspended, non-safe DC voltage (generally 240V or 336V). In the application process, the insulation faults with the most safety hazards are single-point grounding or single-pole insulation drop faults. Single-point grounding or single-pole insulation drop will not affect the normal operation of the HVDC system and is concealed. If the ground fault point cannot be quickly found and repaired, it may caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/20
Inventor 董玉兵张永
Owner DELTA GREENTECH CHINA CO LTD
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