How to perform power outages and power supply operations on high-voltage switchgear?

Power outages and power supply operations on high-voltage switchgear are extremely serious and critical operations in power generation. Safety operating procedures and the "Five Preventions" requirements must be strictly adhered to to ensure personal and equipment safety.

1. Safety first, prevention first. All operations must be based on safety.

2. Strictly implement the operation ticket system. Operations without tickets or verbal schedules are strictly prohibited.

The overall sequence for power outage operations is: "Stop the load side first, then the power supply side; open the circuit breaker first, then pull the disconnector." The goal is to completely de-energize the equipment requiring maintenance and reliably ground it.

Step 1: Preparation and Power Outage Request

Receiving Instructions: Receive the official power outage operation instructions from the dispatcher or the competent department.

Operation:

1. Insert the dedicated operating handle into the grounding switch operating hole.

2. Turn the grounding switch firmly clockwise to close it.

Confirmation: Observe the mechanical indicator window to confirm that the grounding switch is in the "closed" position. The grounding indicator light on the instrument panel will illuminate.

Step 2: Hang Signs

Hang "Do Not Close, Personnel Working!" signs on the operating handles and buttons.

Set up a fence around the maintenance equipment and hang a "Stop, High Voltage Danger!" sign.

The switchgear is now in a safe "maintenance state" and can proceed with subsequent maintenance work.​​

Part II: Power-on Operation (Converting the Switchgear from Maintenance to Operation)

Power-on operation is the reverse of power-off operation, following the sequence: "Close the power supply side first, then the load side; close the disconnector first, then the circuit breaker."

Step 1: Remove Safety Measures

Remove Signs: Remove all temporary signs such as "Do Not Close, Personnel Working!" and "Stop, High Voltage!" Disconnect the Grounding Wire (Open the Grounding Knife Switch):

Use the dedicated operating handle to insert it into the operating hole of the grounding knife switch.

Turn it firmly counterclockwise to open the grounding knife switch. Confirmation: Observe the mechanical indicator window to confirm that the grounding switch is in the "open" position and the grounding indicator light is off.

Step 2: Crank the circuit breaker trolley to the "operating" position.

Operation:

1. Insert the crank handle and crank clockwise.

2. You will feel resistance during cranking until the crank handle stops and the mechanical indicator clearly indicates that the trolley has reached the "operating position."

Confirmation: Observe the trolley position indicator window to confirm that the trolley has fully entered the "operating position." This operation is equivalent to closing the disconnector.

Step 3: Close the circuit breaker (Switch-on).

Operation Location: On the switchgear instrument compartment door.

Operation: After reconfirming that everything is normal, press the green "Close" button.

Confirmation: Observe the OPEN/CLOSED indicator on the switchgear to confirm that the green light (open indicator) is off and the red light (closed indicator) is on. At the same time, listen for an audible confirmation that the circuit breaker is closed and the mechanical indicator shows the CLOSED state.

Step 4: Report and Record

Report the completion of the power supply operation to the dispatcher or the responsible department.

Record the operation time, equipment status, operator, supervisor, and other information in detail in the duty logbook.

All operations described above must comply with the "Five Preventions" of the high-voltage switchgear to protect lives:

1. Prevent accidental opening or closing of circuit breakers. (This is achieved through operation tickets and a monitoring system.)

2. Prevent opening or closing of disconnectors under load. (The trolley can only be moved when the circuit breaker is open.)

Prevent the connection (closing) of the grounding wire (grounding switch) while energized. (The grounding switch can only be closed when the trolley is in the test position.)

KYN28-12 indoor armored metal-enclosed switch equipment by Shaanxi West Power Tongzhong Electrical Co., Ltd (hereinafter referred to as KYN28-12 switchgear) is suitable for three-phase AC 50HZ, 7.2~17.5kV single busbar and single busbar sectionalized power system, with perfect "five-proof" function. The removable part of the switchgear cabinet can be equipped with extractable vacuum circuit breaker or vacuum contactor, isolation trolley, PT trolley and other componentsroducts Descriptioncot.

Contact: Ms.Grace Liu (Director of Sales Department)

Email:xdtz04@westpowerelectric.com

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