During the installation of the 10kV switch cabinet bus bar of a 1100kV substation, the bolts and nuts are not facing the maintenance side, which does not meet the requirements of Article 3 of the Code for the Construction and Acceptance of Bus Devices in Electrical Installation Engineering GB501493.Article 3 states:
The nut should be placed on the maintenance side, and the length of the bolt should be exposed 2-3 buckles".
Figure 1-1 The 10kV switch cabinet busbar nut is not facing the maintenance side.
Cause analysis. 1. The construction personnel do not have a strong sense of responsibility, and mistakenly believe that the live safety distance of the nut towards the maintenance side does not meet the specifications.
requirements, the actual safety distance meets the requirements of the specification;
2. The on-site guidance of the manufacturer's technical service personnel is not in place, and the standardized technical guidance is not provided;
3. The technical and quality management personnel of the construction project department are not in place, and the installation technology quality is in shape.
The construction personnel are not clear about the relevant specification requirements.
Processing. 1. After the supervision project department inspects and finds problems, it will issue a supervision notice in time to request the construction project department.
According to the requirements of the specification, the bus bar nut is oriented to the maintenance side, and the safety distance review meets the requirements of the specification;
2. The construction project department is required to organize the construction personnel to re-disclose the technical quality and clarify the specifications;
3. The supervision project department tracks the rectification process, reviews the rectification results, and requires the construction project department to draw inferences from one case to avoid similar problems.
Figure 1-2 The nut of the 10kV switch cabinet busbar has been oriented towards the maintenance side.
Precautionary measures. 1. Before the start of the installation of the switch cabinet busbar, the construction project department should organize the operators to carry out the relevant standard process publicity and learning and the disclosure of the procedures and specifications, and strengthen the quality control and tracking management of the installation process in the process.
and carry out self-inspection and self-inspection;
2. Supervise the construction project department to strictly implement the concealed engineering inspection system, and the supervision project department earnestly carries out concealment.
Project acceptance work, found problems in a timely manner issued supervision notice to require rectification.
3. If it is found that the safety distance of the switch cabinet bus bar nut facing the maintenance side does not meet the specifications.
Timely take supervision instructions and report to the owner's project department, contact the manufacturer for processing.