How to deal with the tripping fault of the box type substation.
The tripping of the box type substation may be caused by the line or equipment failure. It is prohibited to put it into operation until the cause is identified. The capacitor switching device for landscape type buried substations can be composed of controllable silicon load switches or capacitor specific switching contactors. Thyristors are contactless switching devices, and when the voltage points at both ends are zero (equipotential), they are connected to the filtering branch. Cut off the filtering branch when the current crosses zero. During the switching process, there is no transient impact on the power grid and no surge impact when closing. Low voltage distribution equipment for polycrystalline silicon ingots is widely used in engineering applications, mainly due to the use of AC induction heating for melting. The main reason is that through AC disturbance stirring, the growth of grains is continuously interrupted, causing the grains to become small and polycrystalline, resulting in grain refinement.
1. When the 10kV switch trips, analyze from the fault point and check the operation of the protection action. If no abnormalities are found, then check the trip switch, check the condition of the arc suppression coil, switch indicator lights, etc. If there are no abnormalities in the above checks, it is necessary to check whether the energy storage of the switch is normal and whether the power fuse contact of the switch is good. Remember, if forced power transmission is required, it is necessary to ensure that the protection signal is reset before forced power transmission can be carried out.
2. If the circuit breaker trips due to human error in collision protection; Protection against obvious misoperation tripping; The transformer only has low-voltage overcurrent or time limited overcurrent protection activated, and at the same time, the protection of the next level equipment of the tripped transformer fails but its protection is not activated, and the fault has been cut off, but only one trial power transmission is allowed; In these cases, with the consent of the leadership, power can be tested without inspection. The controller of the high-voltage distribution cabinet calculates the active power, reactive power, and required compensation capacity based on the collected voltage and current. The controller automatically switches on and off according to the set filtering and compensation branch data.
3. When the main switch on the low-voltage side of the box type substation trips, a detailed inspection of the primary and secondary equipment on the low-voltage side is required to determine the possible cause of the fault.
If the overcurrent protection action occurs on the low-voltage side of the box transformer by the complete electrical manufacturer, it can be judged by checking the protection action. If only the overcurrent protection action is on the low-voltage side of the box transformer, two situations can be ruled out: switch misoperation or line fault switch refusal to operate. By further inspecting the secondary equipment, check whether the protective pressure plate is missing, whether the fuse core is burnt out, and determine the cause of the malfunction.
If a box type substation trips, it will stop running and greatly delay its use. The measures taken vary in different situations, and we should treat them one by one.
