With the development of power system , the capacity of the operating equipment is larger, such as thermal power generating units whose capacity is more than 1000MW, and hydraulic power unit which the largest single capacity has reached 800MW; To do AC power frequency withstand voltage test of these devices, if you use the traditional test equipment (frequency test transformer), due to the need of larger capacity , transformer and voltage regulator are very heavy. The power frequency resonance device has great advantages in the aspects of test power supply capacity, equipment weight, test waveform and investment. The device is mainly designed for the AC voltage withstand test of the generator with a capacity of 250MW or less. Specific methods of operation are as follows:
Over current protection setting, 1.2 times the rated current of high voltage side of transformer. For example: the high voltage side rated current of exciting transformer is 50A, the configuration of the transformer is 50/5, so the current relay should be adjusted to 5A.
Over voltage protection settings, according to the test voltage 1.1 times set.
For example: When the test voltage is 39kV, the display should be adjusted to 43kV.
The divider wire is connected to the high voltage current two terminal of the console. Note: All wire must be connected, firm and reliable.
The high voltage current on the exciting transformer is connected to the high voltage current two terminal of the console.
Pressure time setting: set the test time on the time relay to the required test time.
According to the above connection that test wiring is correct, close circuit breaker of the console . At this time if the regulator is not zero, the regulator will automatically return to zero. Do not turn on the main power source, adjust the reactor core clearance, observe the lifting and clearance limit protection function to make sure whether it is normal.
Close the main power source, push the "boost" button to boost on the reactor gain hundreds of volts, by changing the air gap to tune the output voltage to reach the maximum. At this time it can be tuned, and boost to the value of the test voltage. When the voltage reaches the set value , the equipment will automatically return to zero.
Disconnect main power source.
During the test, the relevant personnel should strengthen the monitoring of the test equipment. Once the abnormal phenomenon occurs, the voltage regulator should be quickly reduced, and the power source will be cut off.
The article is powered by Shanghai Himalayal Co.,Ltd
Himalayal,high voltage test equipment expert; we will always by your side.
No comments:
Post a Comment