Pre-control Measures for Hazardous Points in Electrical Equipment Patrol Inspection

Thunderstorm Day

Hazard Points

• Lightning rod drop and back - strike injuring people
• Arrester explosion injuring people
• Outdoor terminal box and gas relay getting rainwater

 Control Measures

• Wear qualified insulating boots and stay at least 5m away from the lightning rod.
• Wear safety helmets properly and do not approach arresters to check action values.
• Keep terminal boxes and mechanism box doors tightly closed, and ensure the gas - proof rain shields are in good condition.
• Prohibit holding umbrellas when patrolling high - voltage equipment in thunderstorm weather.

Foggy Day

Hazard Points

• Sudden equipment pollution flashover (fog flashover) and grounding injuring people
• Reduced air insulation level, prone to discharge
• Low visibility leading to straying into non - safety areas

 Control Measures

• Should patrol in insulating boots.
• When arranging measures or patrolling equipment outdoors, refrain from raising hands.
• Be cautious and careful during patrol.

Icy and Snowy Day

Hazard Points

• Snow melting and dampness in terminal boxes and mechanism boxes, DC grounding or protection malfunction
• Excessively low temperature in battery rooms, unable to work normally
• Slippery patrol paths, prone to falling and straying into snow - covered pits
• Snow on equipment falling and injuring people
• Slipping and falling when going up and down outdoor stairs

Control Measures

• Check that box doors are closed well. If damp, immediately use a hot air blower for drying treatment.
• Keep doors and windows tightly closed, and the temperature should not be lower than the specified value.
• Wear insulated rubber shoes, walk slowly, and clear snow in a timely manner.
• Wear cotton safety helmets.
• Clear snow in a timely manner and hold handrails to walk slowly.

Night

Hazard Points

• Low visibility at night, prone to causing injuries.
• During patrol after a power grid strike, incorrect power transmission may easily lead to electric shock to personnel.
• Uneven patrol path covers, risk of slipping and falling into empty spaces, resulting in contusions and sprains.

Control Measures

• Use lighting batteries with qualified illuminance, and have two people conduct patrol simultaneously, looking out for each other.
• Before patrolling and inspecting after a power grid strike, hang a "No Closing, Personnel Working" sign on the operating handle of the power isolation switch, or have a dedicated person guard it to prevent incorrect power transmission.
• Carefully inspect. The covers should be flat and without movement to ensure walking safety during night patrols.

Hot Weather

Hazard Points

• The oil level of oil - filled equipment rises, and the internal pressure increases, causing oil spraying and serious oil leakage.
• Abnormal oil pressure of the hydraulic mechanism, and the circuit breaker cannot operate safely and reliably.

 Control Measures

• Monitor the change of the oil level. If necessary, request to stop the power and adjust the oil level.
• Monitor that the pressure does not exceed the limit pressure. Manually release the pressure completely, and establish a dedicated record for monitoring and analysis.

Flood Season

Hazard Points

There is accumulated water on the site operating platform and patrol path, threatening the safety of operators.

Control Measures

• Do a good job in pavement drainage, dredge the drainage pipes, and prepare flood - discharge water pumps to ensure they are available at any time.
• Promptly remove the accumulated water on the operating platform. When contacting the equipment, you must wear insulating boots and insulating gloves.

System Grounding

Hazard Points

• Resonance caused by grounding faults is likely to cause PT explosion.
• Step voltage and contact voltage generated at the grounding point may injure people.

Control Measures

• When inspecting the equipment in the station, wear a safety helmet well to prevent injury from explosion fragments. At the same time, stay away from PT.
• During patrol, wear insulating boots and insulating gloves, and keep a distance of more than 8m from the grounding point.

CT Open - Circuit

Hazard Points

CT explosion injures people.

Control Measures

• Wear insulating boots, safety helmets, and insulating gloves.
• Handle it with people simultaneously.

Unusual Sound of Oil - Filled Equipment

Hazard Points

• Equipment explosion injures people.
• Splashed oil catches fire and injures people.

Control Measures

Wear a safety helmet well during patrol, and it should be carried out by 2 people simultaneously.