Switchgear power-on testbench relay protection is an abnormal condition that studies power system failures and endangers safe operation, and discusses countermeasures for anti-accident automatic measures. In the course of its development, relays were mainly used to protect the power system. Its components (generators, transformers, transmission lines, busbars, etc.) are protected from damage and are therefore relay protection.
Switchgear power test bench load tap-oil filtering means test charging cycle, the charging oil filtering device put into operation 24 hours, 7 days, 1 month to take oil samples tested, six months after every test oil sample time to check Assess the filter performance of the oil filter unit. Switch cabinet power test bench installs the tap switch of the charged oil filter device to check and change the oil. Switchgear power-on test bench Transformer on-load tap-changer with live oil filter unit Under the normal operation of the oil filter unit, the switchgear power-on test bench does not need to change the oil according to the cycle. Due to the operation of the oil filter device, the carbon content in the switch is small, so that the influence on the switch is small. Therefore, the time for hanging core inspection of the tap switch can be prolonged.
Switchgear power test bench and the ground line to be disconnected protection devices to ensure the accuracy of the measurement results, an abrupt change can not be measured when the time after rain absorb too much moisture and soil, and the climate, temperature, pressure, measured There should be no stray currents and polarized soil near the ground. Switchgear electricity test bench probe should be away from the groundwater pipe, cable, railway and other large metal body, in which the current pole should be more than 10m away, the voltage pole should be more than 50m away, such as the above-mentioned metal body and the grounding grid is not connected, can shorten the distance 1/2~1/3, pay attention to the position of the current pole to be inserted into the soil, and the grounding rod should be at zero potential. Switch cabinet electricity test bench connection line should use well-insulated wire to avoid leakage phenomenon, the test site can not have electrolytic material and decay body, so as to avoid illusion, the test should choose when the soil resistivity is large, such as early winter or summer dry season When carried out, check the accuracy of the instrument at any time. Avoid strong vibration when using, handling, or storing the switchgear power-on test bench.
When the switch switch power-on test stand pressure switch pressure indicator reaches the specified value, take the oil sample test from the live oil filter device drain valve if the oil insulation strength is less than 30MV/2.5m. When the on-load tap-changer oil level of the switchgear power-on test bench is too low, the oil filter unit trips. In case of other abnormal conditions, the switchgear power-on test bench and the points of anti-accident measures for safety automation devices (hereinafter abbreviated as “pointsâ€) summarize the basic experience of design and operation departments in guaranteeing the safe operation of relay protection devices for many years, and is also the lesson of accidents. Summary: Existing power plants and substation facilities must be immediately changed if they seriously threaten safe operation, and other priorities can be updated or changed in a planned manner. Manufacturing and scientific research departments must also abide by the provisions of this “pointâ€. Cabinet power test bench should be implemented according to this "point".
Switchgear power test bench load tap-oil filtering means test charging cycle, the charging oil filtering device put into operation 24 hours, 7 days, 1 month to take oil samples tested, six months after every test oil sample time to check Assess the filter performance of the oil filter unit. Switch cabinet power test bench installs the tap switch of the charged oil filter device to check and change the oil. Switchgear power-on test bench Transformer on-load tap-changer with live oil filter unit Under the normal operation of the oil filter unit, the switchgear power-on test bench does not need to change the oil according to the cycle. Due to the operation of the oil filter device, the carbon content in the switch is small, so that the influence on the switch is small. Therefore, the time for hanging core inspection of the tap switch can be prolonged.
Switchgear power test bench and the ground line to be disconnected protection devices to ensure the accuracy of the measurement results, an abrupt change can not be measured when the time after rain absorb too much moisture and soil, and the climate, temperature, pressure, measured There should be no stray currents and polarized soil near the ground. Switchgear electricity test bench probe should be away from the groundwater pipe, cable, railway and other large metal body, in which the current pole should be more than 10m away, the voltage pole should be more than 50m away, such as the above-mentioned metal body and the grounding grid is not connected, can shorten the distance 1/2~1/3, pay attention to the position of the current pole to be inserted into the soil, and the grounding rod should be at zero potential. Switch cabinet electricity test bench connection line should use well-insulated wire to avoid leakage phenomenon, the test site can not have electrolytic material and decay body, so as to avoid illusion, the test should choose when the soil resistivity is large, such as early winter or summer dry season When carried out, check the accuracy of the instrument at any time. Avoid strong vibration when using, handling, or storing the switchgear power-on test bench.
When the switch switch power-on test stand pressure switch pressure indicator reaches the specified value, take the oil sample test from the live oil filter device drain valve if the oil insulation strength is less than 30MV/2.5m. When the on-load tap-changer oil level of the switchgear power-on test bench is too low, the oil filter unit trips. In case of other abnormal conditions, the switchgear power-on test bench and the points of anti-accident measures for safety automation devices (hereinafter abbreviated as “pointsâ€) summarize the basic experience of design and operation departments in guaranteeing the safe operation of relay protection devices for many years, and is also the lesson of accidents. Summary: Existing power plants and substation facilities must be immediately changed if they seriously threaten safe operation, and other priorities can be updated or changed in a planned manner. Manufacturing and scientific research departments must also abide by the provisions of this “pointâ€. Cabinet power test bench should be implemented according to this "point".
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