HV Panel Operation SOP
1. Purpose
To ensure safe, reliable, and efficient operation of the HV panel while
protecting personnel and equipment from electrical hazards.
2. Scope
Applicable to all HV switchgear, incoming feeders, and outgoing feeders in
industrial, commercial, or utility environments.
3. Responsibilities
a) Operators: Follow SOP, conduct inspections,
maintain logs.
b) Maintenance team: Ensure panels are serviced
and tested regularly.
c) Shift supervisors: Verify compliance and
authorize switching operations.
4. Safety Precautions
a) Only trained and authorized personnel may
operate HV panels.
b) Always wear PPE: insulated gloves, helmet, face
shield, safety shoes.
c) Ensure earth switch is in proper position
before maintenance.
d) Check for live voltage before touching any
component.
e) Keep clear of moving parts and busbars.
f) Avoid operating in wet or damp conditions.
g) Maintain safe distance from HV equipment per
regulatory standards.
h) Use lockout-tagout (LOTO) procedures during
maintenance.
5. Pre-Operation Checks
1.. Visual Inspection:
a) Check for signs of overheating, oil leakage (for oil-insulated
panels), corrosion, or damage.
b) Ensure indicator lights are working.
c) Verify panel doors and interlocks are intact.
2.. Metering Check:
a) Verify voltmeters, ammeters, frequency meters, and protection
relays are operational.
3.. Environmental Check:
a) Ensure adequate ventilation.b) Confirm no water or dust accumulation inside the panel.
4.. Earthing Verification:
a) Ensure the panel and equipment are properly grounded.
6. Normal Operation Procedure
6.1 Energizing the Panel
1. Verify the incoming supply is available and
stable.
2. Check all circuit breakers are in the OFF
position.
3. Close the earth switch if performing
inspection, then open before closing the main breaker.
4. Close incoming circuit breaker slowly while
monitoring:
I.
Voltage
II.
Current
III.
Frequency
5. Confirm the panel is stable and operating within limits.
6. Close outgoing feeders sequentially as
required.
6.2 Monitoring
·
Continuously monitor:
- I. Voltage, current, frequency
- II. Power factor
- III. Temperature indicators
- IV. Protection relay status
·
Record all readings in the logbook.
6.3 Operating CBs (Circuit Breakers)
·
Operate CBs only if the
load is within rated capacity.
·
Use the remote or
local control switch as required.
·
For overload or fault, trip
the CB immediately.
7. Fault Handling
1. Identify Fault:
o
Short circuit, overload,
earth fault, or relay trip.
2. Isolate the Faulty Section:
o
Open the breaker supplying
the faulty section.
3. Inspect & Correct:
o
Follow maintenance SOP to
repair the fault.
4. Reset and Test:
o
Ensure the faulty area is
cleared before reclosing the breaker.
8. Shutdown Procedure
1. Disconnect all outgoing feeders.
2. Open incoming breaker.
3. Turn off panel lights and auxiliary systems.
4. Close the earth switch for maintenance or
inspection.
5. Record all readings and status in the logbook.
9. Maintenance & Cleaning
·
Monthly:
o
Visual inspection of
insulation, connections, and components.
o
Tighten loose connections.
·
Quarterly:
o
Test protection relays.
o
Verify insulation
resistance using a megger.
·
Annually:
o Full preventive maintenance (oil checks, vacuum/air checks, breaker servicing).
10. Documentation
·
Logbook:
Date, time, operator, readings, any abnormalities.
·
Fault report:
Description, cause, action taken.
·
Maintenance records:
Schedule and completion details.
11. Emergency Procedures
·
For fire:
o
Evacuate area, use CO₂ or
dry powder extinguishers.
·
For shock:
o
Disconnect power, apply
first aid, call medical help.
·
For major fault:
o
Isolate panel, inform
control room, follow emergency SOP.
12. Notes / Best Practices
·
Never bypass interlocks.
·
Avoid frequent switching to
prevent mechanical wear.
·
Always verify proper
coordination with downstream systems.
·
Ensure communication
with control room during switching operations.
.jpg)
0 Comments