1 relay protection troubleshooting methods (1) intuitive method to deal with some of the equipment can not be tested point by point, or a plug-in failure for a time without replacement of equipment, but also want to troubleshoot the situation. Such as 10kv switch cabinet points or reject failure handling. After the operation command was issued, it was observed that the closing contactor or the tripping coil was able to operate, indicating that the electrical circuit was normal and the failure was inside the mechanism. To the scene, if the inside of the relay is directly observed to be yellow, or which component emits a strong burnt smell, etc., the fault can be quickly confirmed and the damaged component can be replaced.
(2) The swap method replaces a suspected or deemed faulty component with the same or better component to determine whether it is good or bad and can quickly narrow down the fault. This is the most common method of handling internal failures in integrated automation protection devices. When some microcomputer protection faults, or some internal circuit complex unit relays, can be replaced with nearby plug-ins or relays that are spared or temporarily inspected.
(3) The item-by-item demolition (exclusion) method will disconnect the secondary circuits connected in parallel and then put them back in order. Once a fault occurs, it indicates which way the fault exists. Use the same method to find the smaller branch road in this road until you find the fault point. This method is mainly used to check the DC grounding, AC power fuses can not put on and other faults. Such as DC ground fault. First through the pull method, according to the importance of the load, respectively, briefly open the DC load circuit for DC load circuit, the cut off time shall not exceed 3 seconds, when the removal of a circuit failure disappears, then the fault is within the loop , Further use the pull method to determine the branch where the fault is located. Then disconnect the power terminal of the grounding branch until you find the fault point. If the secondary fuse of the voltage transformer is blown, there is a short-circuit fault in the circuit, or the secondary AC voltage is mutually connected, etc., the terminal can be separated from the total lead-out of the secondary short-circuit phase of the voltage transformer. At this time, the fault is eliminated. Then recover one by one, until the fault occurs, and then branch road investigation. If the protection fuse of the whole device is blown or the power air switch is not closed, the fault range can be narrowed by checking the plug-in and check-out of each block plug and combining the change of the observation of the fuse blowing. For another example, the protection device sends a control circuit disconnection signal, and the potential of the closing and opening circuit of the switchgear cabinet cable can be measured with a multimeter on the protection screen. It can be initially determined whether the fault point is on the switchgear cabinet or the protection device, and then the fault is further performed. exclude.
2 Measures that can be taken (1) The on-duty operating personnel regularly inspects and inspects the relay protection device, and a good record of operation should be made for the operation.
(2) Establish a post responsibility system so that everyone has a post and each post has someone.
(3) Do a good job of cleaning relay protection devices. Cleaning must be carried out by two persons to prevent accidental collision with the operating equipment, pay attention to maintaining a safe distance from live equipment, and avoid personal electric shock and secondary circuit short circuit and grounding accidents.
(4) The microcomputer-protected current and voltage sampling values ​​are recorded once a week, and the differential current must be recorded for differential protection.
(5) Regularly perform infrared temperature measurement on the terminal block of the protection device, and detect the heat caused by poor contact as soon as possible.
(6) Check and print the printer protected by the computer every month.
(7) Periodically check whether the protection device time is correct every month to facilitate fault analysis after failure.
(8) Regularly check the protection zone and check out the fixed value sheet to verify
(2) The swap method replaces a suspected or deemed faulty component with the same or better component to determine whether it is good or bad and can quickly narrow down the fault. This is the most common method of handling internal failures in integrated automation protection devices. When some microcomputer protection faults, or some internal circuit complex unit relays, can be replaced with nearby plug-ins or relays that are spared or temporarily inspected.
(3) The item-by-item demolition (exclusion) method will disconnect the secondary circuits connected in parallel and then put them back in order. Once a fault occurs, it indicates which way the fault exists. Use the same method to find the smaller branch road in this road until you find the fault point. This method is mainly used to check the DC grounding, AC power fuses can not put on and other faults. Such as DC ground fault. First through the pull method, according to the importance of the load, respectively, briefly open the DC load circuit for DC load circuit, the cut off time shall not exceed 3 seconds, when the removal of a circuit failure disappears, then the fault is within the loop , Further use the pull method to determine the branch where the fault is located. Then disconnect the power terminal of the grounding branch until you find the fault point. If the secondary fuse of the voltage transformer is blown, there is a short-circuit fault in the circuit, or the secondary AC voltage is mutually connected, etc., the terminal can be separated from the total lead-out of the secondary short-circuit phase of the voltage transformer. At this time, the fault is eliminated. Then recover one by one, until the fault occurs, and then branch road investigation. If the protection fuse of the whole device is blown or the power air switch is not closed, the fault range can be narrowed by checking the plug-in and check-out of each block plug and combining the change of the observation of the fuse blowing. For another example, the protection device sends a control circuit disconnection signal, and the potential of the closing and opening circuit of the switchgear cabinet cable can be measured with a multimeter on the protection screen. It can be initially determined whether the fault point is on the switchgear cabinet or the protection device, and then the fault is further performed. exclude.
2 Measures that can be taken (1) The on-duty operating personnel regularly inspects and inspects the relay protection device, and a good record of operation should be made for the operation.
(2) Establish a post responsibility system so that everyone has a post and each post has someone.
(3) Do a good job of cleaning relay protection devices. Cleaning must be carried out by two persons to prevent accidental collision with the operating equipment, pay attention to maintaining a safe distance from live equipment, and avoid personal electric shock and secondary circuit short circuit and grounding accidents.
(4) The microcomputer-protected current and voltage sampling values ​​are recorded once a week, and the differential current must be recorded for differential protection.
(5) Regularly perform infrared temperature measurement on the terminal block of the protection device, and detect the heat caused by poor contact as soon as possible.
(6) Check and print the printer protected by the computer every month.
(7) Periodically check whether the protection device time is correct every month to facilitate fault analysis after failure.
(8) Regularly check the protection zone and check out the fixed value sheet to verify
Shower Valve,Shower Faucet,Thermostatic Shower,Shower Handle
Moon Shower Sanitaryware Co.,Ltd , https://www.moonshowerglobal.com