【Daily Topic】【Electrical Edition 20160712】
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Participation reward: 2 Wealth. Reward for correct answer: 9 Wealth. Quiz: What are the steps to detect direct current grounding?
Upon identifying a DC ground fault, based on analysis and assessment, the method of isolating the faulty section is used. Following the principle of addressing the signal and lighting systems first before the operational components, and the outdoor areas before the indoor areas, the steps are as follows: 1. Determine whether it is a ground fault in the control system or the signal system. 2. Signal and lighting circuits. 3. Control and protection circuits. 4. The sequence for removing fuses is as follows: when the positive terminal is grounded, first disconnect (+) and then (-); when restoring the fuses, first reconnect (-) and then (+).
Based on the operating mode, operational conditions, and climate effects, identify the areas where grounding may occur; then use methods such as searching along the circuits and handling them in segments, following the principle of addressing the signaling and lighting components first before the operational components, and the outdoor parts first before the indoor parts. When cutting off each dedicated DC circuit, the cut-off time shall not exceed 3 seconds, and the circuit shall be reconnected regardless of whether it is grounded or not. When a ground fault is detected in a specific DC circuit, the grounding point should be located promptly and eliminated as soon as possible.
Based on the operating mode, operational conditions, and climate impacts to identify areas that may become grounded, a method of searching by dividing the circuit into sections is adopted, following the principle of addressing the signaling and lighting components first before the operational components, and the outdoor parts first before the indoor parts. When cutting off each dedicated DC circuit, the cutting time should be as short as possible, and the circuit should be reconnected regardless of whether it is grounded or not.
Upon identifying a DC ground fault, based on analysis and assessment, the method of isolating the faulty section is used. Following the principle of addressing the signal and lighting systems first before the operational components, and the outdoor areas before the indoor areas, the steps are as follows: 1. Determine whether it is a ground fault in the control system or the signal system. 2. Signal and lighting circuits. 3. Control and protection circuits. 4. The sequence for removing fuses is as follows: when the positive terminal is grounded, first disconnect (+) and then (-); when restoring the fuses, first reconnect (-) and then (+).
Based on the operating mode, operational conditions, and climate effects, identify the areas where grounding may occur; then use methods such as searching along the circuits and handling them in segments, following the principle of addressing the signaling and lighting components first before the operational components, and the outdoor parts first before the indoor parts. When cutting off each dedicated DC circuit, the cut-off time shall not exceed 3 seconds, and the circuit shall be reconnected regardless of whether it is grounded or not. When a ground fault is detected in a specific DC circuit, the grounding point should be located promptly and eliminated as soon as possible.
Based on the operating mode, operational conditions, and climate effects, identify the areas where grounding may occur; then use methods such as searching along the circuits and handling them in segments, following the principle of addressing the signaling and lighting components first before the operational components, and the outdoor parts first before the indoor parts. When cutting off each dedicated DC circuit, the cut-off time shall not exceed 3 seconds, and the circuit shall be reconnected regardless of whether it is grounded or not. When a ground fault is detected in a specific DC circuit, the grounding point should be located promptly and eliminated as soon as possible.
Determining the cause of DC grounding should be based on factors such as the operating mode of the DC system, operational conditions, and the influence of climate conditions. Generally, it involves searching along the route and using a segmented approach. Adhere to the principle of signal part first, protection part later; outdoor part first, indoor part later. When cutting off each dedicated DC circuit, the cutoff time must not exceed 3 seconds; the switch should be closed immediately regardless of whether the circuit is grounded or not. When a ground fault is detected in a particular dedicated DC circuit, the grounding point should be identified as soon as possible and the fault resolved promptly.
Determining the cause of DC grounding should be based on factors such as the operating mode of the DC system, operational conditions, and the influence of climate conditions. Generally, it involves searching along the route and using a segmented approach. Adhere to the principle of signal part first, protection part later; outdoor part first, indoor part later. When cutting off each dedicated DC circuit, the cutoff time must not exceed 3 seconds; the switch should be closed immediately regardless of whether the circuit is grounded or not. When a ground fault is detected in a particular dedicated DC circuit, the grounding point should be identified as soon as possible and the fault resolved promptly.
For DC grounding, based on analysis and judgment, the method of tracing the circuit to identify the affected sections is used. Following the principle of addressing the signal and lighting systems first before the operational components, and the outdoor areas before the indoor areas, the steps are as follows: (1) Determine whether it is a grounding issue in the control system or the signal system; (2) Check the signal and lighting circuits; (3) Examine the control and protection circuits; (4) When removing fuses, disconnect the (+) terminal first and then the (-) terminal, and when reinserting fuses, insert the (-) terminal first and then the (+) terminal
For DC grounding, based on analysis and judgment, the method of tracing the circuit to identify the affected sections is used. Following the principle of addressing the signal and lighting systems first before the operational components, and the outdoor areas before the indoor areas, the steps are as follows: (1) Determine whether it is a grounding issue in the control system or the signal system; (2) Check the signal and lighting circuits; (3) Examine the control and protection circuits. (4) Regarding fuses, in the case of positive-grounding, disconnect (+) first and then (-); when reinserting fuses, insert (-) first and then (+)