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DC system insulation trend analysis method

A DC insulation and DC system technology, applied in the direction of measuring devices, instruments, short-circuit testing, etc., can solve problems such as high fault concealment, difficult insulation drop early alarm, and difficulty in troubleshooting, so as to alleviate potential safety hazards and reduce unreliable quality effect of factors

Pending Publication Date: 2020-10-13
HAINAN POWER GRID CO LTD ELECTRIC POWER RES INST
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AI Technical Summary

Problems solved by technology

However, some faults are gradual, not sudden; if the fault is highly concealed, it is difficult to troubleshoot
The system runs for a long time with faults, and the potential safety hazards brought to the power system will increase exponentially. In the current existing technology, the grounding fault is checked when the insulation monitoring device alarms. The fault has already threatened the safe and reliable operation of the DC system, which is difficult to achieve. Early warning and trend prediction of insulation drop

Method used

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Embodiment Construction

[0027] In order to better understand the technical content of the present invention, specific embodiments are provided below, and the present invention is further described in conjunction with the accompanying drawings.

[0028] See figure 1 , A DC system insulation trend analysis method, characterized by comprising the following steps:

[0029] S1. Set the control resistance threshold R of the DC system and the resistance compliance change ΔR. According to the industry standard "DL / T1392-2014 DC power system insulation monitoring device technical conditions", set the control resistance threshold R to 300KΩ, and the resistance will change in compliance The amount ΔR is 30KΩ.

[0030] S2. The DC system insulation monitoring unit collects the DC insulation resistance value three times in a row within the time T, and the interval time t for each collection is the same;

[0031] S3. The control center of the DC system judges whether the three DC insulation resistance values ​​are all abn...

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Abstract

The invention provides a DC system insulation trend analysis method. The DC system insulation trend analysis method comprises the following steps of: S1, setting a reference resistance threshold R anda resistance compliance variable quantity delta R of a DC system; S2, continuously collecting direct current insulation resistance values for three times within the time T by means of a direct current system insulation monitoring unit; and S3, judging whether the three times of direct current insulation resistance values are all abnormal values or not by the control center of the direct current system, if the three times of direct current insulation resistance values are all abnormal values, establishing an insulation resistance trend curve according to the three times of direct current insulation resistance values by means of the control center, and giving an alarm according to the insulation resistance trend curve by means of the control center.

Description

Technical field [0001] The invention relates to the technical field of insulation failure prediction, in particular to a direct current system insulation trend analysis method. Background technique [0002] In power plants and substations, the DC system provides reliable DC power for control signals, relay protection, automatic devices, circuit breaker tripping and closing operating circuits, etc. under normal conditions; it is an accident in the event of an AC power loss accident Lighting, AC uninterrupted power supply and accident lubricating oil pump provide DC power supply. The reliability of the DC system plays a vital role in the safe operation of power plants and substations, and is a guarantee for safe operation. Due to the important position of the DC power supply in the secondary system, the reliability and safety of the DC system itself directly affects the safety of the entire system. Although the DC power supply is very stable and reliable, in practical applications...

Claims

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Application Information

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IPC IPC(8): G01R31/52G01R27/02G08B21/18
CPCG01R31/52G01R27/025G08B21/185
Inventor 吴强陈川刚朱姣符小桃陈飞段振斌程冰
Owner HAINAN POWER GRID CO LTD ELECTRIC POWER RES INST
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