To ensure the safe, continuous, and reliable operation of substations, CHH Power has established a comprehensive set of standardized procedures covering shift handover, daily operations, emergency response, and maintenance coordination. These procedures clarify responsibilities, streamline workflows, and minimize operational risks. Below is a detailed breakdown of each key process.
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1. Pre-Takeover Preparation
Before assuming duty, incoming personnel must complete the following preparatory steps in accordance with CHH Power’s safety management regulations:
- Uniform & Identification: Wear standardized on-duty uniforms and display valid job badges (with photo and position information) to ensure compliance with on-site safety protocols.
- Work Division & Equipment Familiarization:
- Clarify task assignments within the incoming team (e.g., primary equipment inspection, secondary system review, log verification).
- Review the latest operational records of critical equipment (e.g., transformers, switchgear) to understand their current status, load levels, and recent maintenance history.
2. Operational Status Briefing by Outgoing Shift
The outgoing shift team must provide a comprehensive briefing to the incoming team, covering all critical operational details:
- Primary & Secondary Equipment Status: Explain the current operating modes of primary equipment (e.g., on/off status of high-voltage circuit breakers, tap positions of transformers) and secondary systems (e.g., protection relay settings, SCADA system operation).
- Work Summary: Detail key activities during the shift, including:
- Discovery and resolution of equipment defects.
- Handling of abnormal events, accidents, or maintenance/testing work.
- Auxiliary Information:
- Status of safety tools and instruments (e.g., insulation gloves, voltage testers) and their usage records.
- Implementation progress of superior instructions (e.g., dispatch center directives, company safety notices).
3. On-Site Inspection
After the briefing, the incoming team conducts a targeted on-site inspection based on their division of labor:
- Main Control Room Check:
- Verify the normal operation of secondary equipment (e.g., control panels, communication devices, alarm systems).
- Confirm that tools (e.g., operation keys, test meters) are properly stored, complete, and in good condition.
- Field Equipment Inspection:
- Inspect primary equipment (e.g., transformers, isolating switches, GIS cabinets) for visible abnormalities such as oil leaks, abnormal noises, loose connections, or damaged insulation.
- Check that safety measures (e.g., grounding wires, warning signs, safety barriers) are correctly placed as required.
4. Formal Shift Handover Procedures
Once the incoming team confirms no issues during the inspection, the shift handover is formalized through the following steps:
- Verification & Sign-Off: Both teams review and confirm the accuracy of the Shift Duty Record Book. The outgoing and incoming shift supervisors sign the book, documenting the exact handover time (to the minute).
- Handover Announcement: The incoming shift supervisor announces that the outgoing team is officially off duty, marking the completion of the handover process.
5. Daily On-Duty Work After Takeover
Immediately after taking over, the incoming team initiates daily operational tasks as per CHH Power’s standards:
- Record Documentation: Log the takeover details (e.g., inspection results, team member names) in the Duty Record Book.
- Routine Verifications:
- Check and synchronize station clocks to ensure time consistency for operational records.
- Test communication channels with the grid dispatch center (e.g., landline, SCADA system) to confirm smooth connectivity.
- Review and sign off on the outgoing shift’s operation logs, then update the log with the current date, on-duty team, and initial equipment status.
6. Countdown Operation Procedures (Scheduled Tasks)
For scheduled operations (e.g., equipment switching, load adjustment), CHH Power enforces a strict “countdown” workflow to ensure accuracy and safety:
- Order Receipt & Recording: On-duty personnel receive the dispatch order, record key details (order time, content, issuer), and forward the task to the designated operator.
- Order Review: The operator and guardian jointly listen to the dispatch order recording to ensure full understanding.
- Document Preparation:
- The supervisor fills out the Dispatch Order Record Form.
- The operator prepares the Operation Ticket (detailing step-by-step operations, safety measures, and risk controls).
- Verification & Approval: The operator and guardian cross-verify the Operation Ticket, then submit it to the on-duty supervisor for final review and signature.
- Operation Execution: The operator carries out the task under the guardian’s supervision (adhering to CHH Power’s “two-person operation system”).
- Completion Reporting: After confirming the operation is successful, the guardian reports the result to the dispatch center and updates the operational records.
7. Accident Handling Procedures
In the event of an accident (e.g., equipment failure, power outage, short circuit), on-duty personnel follow CHH Power’s emergency response plan:
- Immediate Control: Implement measures as instructed by the dispatch center (e.g., isolating faulty equipment, activating backup power) to prevent the accident from expanding.
- Status Monitoring & Recording:
- Observe and record changes in instrument readings (voltage, current, frequency).
- Check and document the activation of light signals (fault alarms, trip indicators) and any missing signals.
- Detailed Reporting: Submit a comprehensive accident report to the dispatch center, including the time, location, affected equipment, observed symptoms, and initial handling measures. Coordinate with CHH Power’s maintenance team for on-site support if necessary.
8. Maintenance Coordination
When maintenance work is scheduled, the on-duty team coordinates closely to ensure safety and efficiency:
- Work Permit Preparation: The authorized work permit issuer (a qualified CHH Power staff member) fills out the Work Permit Form, specifying the work scope, duration, and required safety measures.
- Safety Measure Deployment: On-duty personnel arrange on-site safety measures (e.g., installing grounding wires, setting up safety barriers, posting warning signs) as per the work permit.
- On-Site Handover: The work permit issuer and maintenance team leader jointly inspect and confirm the safety setup before signing the permit and authorizing work to start.
- Process Supervision: During maintenance, on-duty personnel periodically check to ensure the maintenance team complies with safety regulations (e.g., wearing PPE, avoiding unauthorized operations) and that the work scope is not exceeded.
By strictly adhering to these standardized procedures, CHH Power ensures that substation operations are systematic, transparent, and safe—laying a solid foundation for the stable operation of the power grid.
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