Analysis of the reasons for sudden calls from power outage equipment
Why are the equipments for power outages accidentally called? What are the possible sudden calls? According to the analysis of the relevant situation and the summary of the accident lessons, the main reasons for the sudden power failure of the power outage equipment are:
1 The power outage equipment is charged due to misadjustment of power transmission or misoperation;
2 Reverse power transmission to the power outage equipment due to erroneous operation of the self-generating, dual-supply users and the transformers used in the power plant substation and the secondary circuit of the voltage transformer;
3 Induction of nearby live equipment, especially when the live line parallel to the power failure maintenance line flows through the single-phase ground short-circuit current (referring to the large ground current system), or flows through the two-phase ground short-circuit current, causing the power outage equipment to be accidental. The ground is exposed to dangerous voltage.
4 The power-off line and the live line are erected or cross-over on the same pole, and accidental contact or near discharge occurs between the two, causing the power-off work equipment to be suddenly charged.
From the above analysis of the sudden call cause, there are unsafe factors for sudden incoming calls at any time on the power outage site. We must conduct professional analysis on the status of the work object and the environment before any work, analyze the danger, identify the dangerous points, and take precautions for dangerous points. Do not operate before taking safety measures, and find danger in work. , to immediately withdraw from the scene.
1. Protective measures for sudden calls
At present, the protective measures taken for sudden calls have necessary safety organization measures and possible technical measures to improve the level of equipment automation and take blocking measures. More importantly, the power outage work equipment may be grounded at three-phase short-circuit grounding. The main technical measures for power outage work - hanging the ground wire.
(1) Organizational measures to ensure safety:
Organizational measures such as work ticket system, work permit system, job guardianship system, work interruption, transfer and termination system are preventive measures to prevent sudden calls.
The work ticket system is a written order that permits work on electrical equipment. Work tickets can clarify safety responsibilities, perform work permits, work interruptions, transfers and terminations, and serve as a written basis for completing other safety measures. Except for certain specific circumstances, work tickets must be filled out for work on electrical equipment.
The work permit system refers to work on electrical equipment, and must obtain the consent of the work licensor in advance, and is not allowed to work without permission. The work licensor must clarify that the equipment has been transferred to the inspection state as required, and then the order for permitting work is allowed. This is an effective measure to prevent sudden incoming call factors.
The work guardianship system is the main measure to ensure personal safety and correct operation. The duty of the guardian is to ensure the safety of the staff at work. The work guardian (responsible person) shall explain the site safety measures, live parts and other precautions to the work class.
The work interruption and transfer system is a provision for whether the work permit procedure needs to be performed separately after the work interruption and transfer. For the interruption and transfer of work, it is necessary to carry out the work interruption process.
(2) Technical measures to prevent sudden calls:
1 preventive technical measures:
a. Power outage. In the event of power outages, power outages of power outages, and the correct implementation of power outages and careful implementation are an essential measure to prevent sudden accidents.
b. Power inspection. The use of an electroscope with an appropriate voltage level and qualified electroscope to inspect the power outage is one of the important means to verify the system and implementation of the power outage measures. Since there is a lot of electricity that is considered to be unpowered but actually charged, it is necessary to perform a power test before installing the ground wire to determine that the device is voltage-free.
c. Hanging the signboard is to remind the relevant personnel to correct the wrong operation and practice to be carried out in time. In order to prevent the erroneous operation of the equipment to be turned on and off due to misoperation, it is required to be connected to the operating handle of the circuit breaker and the disconnector of the working place once closed, and the suspension should be suspended. !"nameplate.
2 Protective measures to prevent sudden calls:
For the protection of sudden incoming calls, the main protective measures or the only protective measures taken are to install the grounding wire. Installing the grounding wire includes closing the grounding knife gate and suspending the temporary grounding wire.
The safety awareness of the staff is poor, the security thinking is weak, and the safety and technical quality is low. No matter how careful and detailed the safety measures are, there is nothing to do. Therefore, we should strengthen safety ideological education, safety technical training, and resolutely put an end to habitual violations while doing a good job of sudden call protection, and truly implement the principle of "safety first, prevention first" and improve staff in an all-round way. The quality is the top priority.
Concerned about surprises
Label: Analysis of the cause of sudden call failure of power outage equipment
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