1、 Handling methods for serious protection exceptions
In case of any of the following circumstances, the device shall be stopped immediately with the consent of the dispatcher on duty:
1. The device smokes and catches fire;
2. Discharge sound occurs inside the device;
3. Device deformation and relay overheating deformation;
4. Other situations that can cause obvious danger of maloperation or refusal to operate;
5. The device has a fault signal and cannot be reset.
2、 Processing Method for Abnormal Loss of DC Power Supply of Protection Device
If DC disappears from the individual protection device, the inverter power indicator on the device will go out. If this is not caused by the DC power switch tripping, it is often caused by the inverter damage or the disconnection of the DC circuit inside the device, the protection personnel shall be notified immediately for handling.
When DC disappears from the whole set of protection screen, first check whether the corresponding DC power switch on the DC power sub screen is separated and whether the fuse is fused. If it is not caused by the above reasons, it may be caused by the disconnection of the DC circuit inside the device or the looseness of the terminal. If it cannot be eliminated, it shall be timely notified to the protection personnel for handling.
3、 Handling method for abnormal disappearance of protection AC voltage.
When the distance protection AC disappears, the signal "* * protection AC voltage loss" will appear on the central signal screen, and the AC voltage break blocking relay on the protection screen displays the broken phase and the broken circuit alternately. When U1>U2, it means that the protection voltage disappears and the distance protection is blocked; When U1
In case of the above situations, first check whether the corresponding small AC switch is tripped (including the AC switch on the voltage transformer terminal box and the protection screen). If it is normal, then check according to the drawing.
If the defect cannot be eliminated, the protection personnel shall be notified immediately for handling.
4、 ABB protective device exception handling method
Check whether the green LED on the MMI of the protection device flashes, and whether the corresponding card dropping unit loses the card. If there is no above phenomenon, it may be a false signal, which can be reset;
If the above phenomenon occurs, it indicates that there is a fault inside the device, and the protection personnel shall be notified to handle it.
If the green LED does not light up, it means that the DC of the device disappears, and corresponding inspection shall be carried out.
5、 WXB-11 Protection Exception Handling Method
The "report" light on a CPU plug-in is on, but the "to be printed" light on the monitoring plug-in does not respond. It may be that the CPU patrol switch on the monitoring plug-in is at the "exit" position and should be set to the "input" position.
The "to be printed" light on the monitoring plug-in is always on, which may be: printer failure, print cable failure, output optocoupler failure, etc.
The "report" light of a CPU plug-in and the "to be printed" light on the monitoring plug-in are always on, which may be: the printer is powered off, the printer is offline, the printing paper is used up, etc.
When the CPU "alarm" and "general alarm" lights are on, the fault information table (see appendix) should be used to find out the cause and notify the maintenance personnel to repair.
6、 LFP-901A Protection Exception Handling Method
The "OP" light on a CPU plug-in is off, indicating the setting value or protection alarm. At the same time, the screen displays the error content, and the central light word signal of "device abnormality" is displayed.
Respond to the fault information table, analyze the causes, and disable the protection. Notify the maintenance personnel to repair.
7、 Exception handling method of YS-88 fault recorder
In case of DC disappearance, the device will send a central signal of "DC disappearance of 220KV fault recorder".
If the DC of both screens disappears, check whether the DC split screen "220KV fault recorder power supply" is separated and whether the fuse is fused.
Check whether the DC air switch in front of the screen is tripped. After tripping, try to send it. If it is tripped again, check whether the circuit is short circuited.
Check whether the DC fuse on the terminal block behind the screen is fused. If it is fused, open the DC air switch in front of the screen, measure the circuit resistance, and replace it with a new fuse. Pay attention to prevent arc damage during replacement.
If the device is abnormal, the device sends a central signal of "220KV fault recorder fault".
At this time, first determine which fault recorder is faulty, check whether the "Fault" light on the fault recorder is on, check the display content, and determine the nature of the fault.
If necessary, press the "Reset" key to restart the fault recorder. If the fault cannot be eliminated, report it to the dispatcher and relevant departments.
8、 Abnormal Handling Method of Stable Machine Cutting Device in North Jiangsu
In case of abnormal signal of the device, the display result of the device shall be checked in time to find out which part of the abnormality is and eliminate it as soon as possible.
In case of PT circuit disconnection, check the reason for disconnection as soon as possible, check whether the air switch of voltage circuit trips, check whether the protection voltage used for the same group of secondary coils is normal, check whether the terminal of voltage circuit is loose, etc., and deal with it as soon as possible according to different reasons.
If the LCD displays the fault type clearly, handle according to the prompts.
If the LCD display is abnormal or there is no display, and the cause cannot be found for a while, the device should be exited and the professional should be notified for handling.
9、 Method of Handling GPS Satellite Clock Device Abnormity
First check the power supply.
Check the panel indication of A and B devices, and then deal with them according to the panel indication.
If the "Synchronization" indicator is not on, check whether the power supply is switched off and whether the antenna is inserted normally.
If only one set of GPS device's "second signal" indicator is not on or the "fault" indicator is on, disconnect the DC power switch and AC power switch behind the device, and then close them to check whether they can be started normally.
If the DC power supply air switch and AC power supply air switch behind the screen are tripped, test run can be conducted.
If the fault still exists, it shall be reported to the dispatching and relevant departments for handling.
10、 Abnormal processing method of protection high-frequency channel
Abnormal and fault phenomena of protection high-frequency channel
1. No peer signal is received during the test.
2. Channel abnormal alarm.
3. Line carrier fault or pilot disappearance alarm, and the signal cannot be reset.
4. The receiving margin is insufficient during the test.
5. If the power supply of the power amplifier is not reset, the signal cannot be reset.
6. The high frequency channel is seriously interfered and receives messages by mistake frequently.
7. With the protection of remote signaling circuit, when the other side is normal, the local side cannot start remote signaling.
Handling of protection high frequency channel abnormity and fault
1. When the protection channel fails, it shall be reported to the dispatcher immediately. In the report, it shall be clear which line and which set of protection high-frequency channel is abnormal.
2. For the locking type high-frequency directional protection, when the channel is abnormal, it shall apply for shutdown to prevent misoperation caused by external faults.
3. For the permissive high-frequency directional protection, if the channel is abnormal, it will lose the quick break function, and it will be given back according to the dispatching command.
4. When the high-frequency phase difference protection channel is abnormal, it shall be applied for shutdown to prevent the protection from maloperation.
5. When the channel is abnormal, the high frequency blocking distance and zero sequence protection will fail to operate correctly, so the normal distance and zero sequence protection shall be applied for.
6. The transceiver sends messages for a long time, which may be due to the failure of internal components of the transceiver, so it should apply for deactivation; If the opposite side sends messages for a long time and the local side receives messages for a long time, it may be the internal fault of the opposite transceiver, which shall be reported to the dispatcher for handling.
7. If the operator cannot handle it, he/she shall report it to the superior and notify the professional personnel for maintenance.
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