When the voltage rises to 30.3kv, stop for one minute for observation
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After water and electricity are connected and there is a communication signal, actively check the electrical damage on the project
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Since there is an insulation resistance meter, it has the significance of existence, The internal output voltage of the multimeter is very low, and the gear is limited, which can not really reflect the insulation performance of electrical equipment and cables under high voltage conditions
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For all circuit breakers in the low-voltage room of the transformer, ensure that the insulation resistance of the connecting cable from the primary cabinet to the box transformer is tested when disconnected（ When communicating with a colleague some time ago, the author found that he was very dependent on and trusted in the multimeter and thought that the insulation of the cable could be measured with the ohm gear of the multimeter (there was no need to use the insulation resistance meter)
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Actively contact the power supply emergency repair personnel of the power supply company to communicate the required conditions before high-voltage power transmission
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(since there is only one 1000V insulation resistance meter on site, the insulation resistance of the high-voltage incoming line is self checked when the switching post at the upper end is completely disconnected after communication with the power supply station, Apply for pressurization test after checking the insulation resistance between three-phase and ground and between phases
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Then the high voltage can be transmitted
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Generally speaking, the greater the insulation resistance of 500 volt insulation ohmmeter telemetry cable, the better is infinity
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The so-called “pressurization” is to conduct DC withstand voltage test
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In the face of natural disasters, we can only work together to prevent and fight floods
You should know that the existence is reasonable
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The commonly used 500 volt insulation resistance meter can output 500 volt DC voltage, so it can measure the insulation resistance value in line with the actual work
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After there is no problem, issue the test report and submit it to the power supply department under its jurisdiction
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In fact, the idea of taking the world with one meter is very dangerous
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As an electrical maintenance worker in the production line, in this emergency, in addition to reporting the actual situation of the site to the leaders at the first time, it is also recommended that all the low-voltage room circuit breakers of the outdoor box transformer on the project should be pulled down, and actively organize the startup of the standby power supply to ensure the most basic survival
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We firmly believe that there must be a rainbow after the storm
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Summary: for equipment and power supply cables, long-term rain immersion is bound to reduce their insulation performance, resulting in irregular tripping of leakage protector
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Click the electrician and electrical learning above to pay attention to and star standard professional self media in the field of electrician and electrical, which can’t be missed Recently, due to the raging typhoon “fireworks”, the sudden rainstorm has caused great damage to the city where the author works
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As far as the author’s project is concerned, the on-site safety manager focuses on the temporary power supply, cooperates with the power supply company, and timely communicates with the power supply company to check whether there is water under the foundation pit of the outdoor box transformer on site
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This is a major event for the electrical workers on site
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