Pamatan-on ug Pagsakop sa mga Item sa 10kV High-Voltage Switchgear

I. Paghigayon nga Pagpangamuyo ug Inspeksyon

(1) Biswal nga Inspeksyon sa Switchgear Enclosure

• Walay pagbag-o o pisikal nga danyo sa enclosure.

• Ang protective paint coating walay severe rust, peeling, o flaking.

• Ang cabinet maayo nga gisulod, clean sa surface, ug walay foreign objects.

• Ang nameplates ug identification labels maayo nga gipasabot ug dili mosagbot.

(2) Pagsusi sa Switchgear Operating Parameters

• Ang instruments ug meters nagpakita og normal nga values (comparable sa typical operating data, walay significant deviation ug consistent sa equipment status).

(3) Temperature Check sa mga Components, Electrical Connections, Wires, ug Cables

• Gamiton ang infrared thermometer aron masukod ang accessible components, electrical joints, wires, ug cables: operating temperature ≤ 60°C.

• Walay unusual odor sa cabinet.

(4) Pagsusi sa Switch Positions, Indicator Lights, Meter Displays, ug Selector Switch Positions

• Ang circuit breaker open/closed position correct.

• Walay alarm indications.

• Tanang selector switches maayo nga gisulod.

II. Annual Scheduled Maintenance

(1) Pagsusi, Pagkalinis, ug Pagbutang sa Defect sa Enclosure

• Wipe gamit ang alcohol ug clean cotton cloth aron siguraduhon nga walay dust accumulation o stains.

• Pagsusi sa protective paint para sa severe rust o peeling; kon makita, isulod ang rust removal ug repaint.

(2) Cable Compartment Inspection ug Maintenance

• Ang cable entry seals intact.

• Ang cable plug fixing screws walay loose.

• Ang cable identification tags ug phase color markings present ug walay missing o detached.

• Ang cable compartment dry, walay condensation; clean ug dust-free.

• Wipe ang insulators gamit ang alcohol ug clean cotton cloth aron siguraduhon nga walay dust o contamination.

• Ang grounding conductor secure walay looseness.

(3) Grounding Switch Inspection

• Manually operate ang grounding switch pinaagi sa usa ka full open-close cycle.

• Ang operation smooth, walay jamming.

• Ang switch position must match the indicator on the front panel.

(4) Circuit Breaker Compartment Inspection ug Maintenance

• Withdraw ang main circuit breaker sa test position ug gamit ang trolley ipuli sa labas sa compartment. Pagsusi sa primary isolation contacts ug connected copper busbars para sa signs of burning or arcing. Kon kinahanglan, polish gamit ang sandpaper ug clean gamit ang alcohol-soaked cloth.

• Apply uniform layer of conductive grease (0.5–1 mm thick) sa main circuit breaker’s isolation contacts.

• Tighten tanang primary circuit bolts sa specified torque values. Pagkatighten, check nga flat ang spring washers. Mark anti-loosening lines sa tanang tightened bolts.

• Wipe tanang components sa circuit breaker compartment gamit ang alcohol ug clean cotton cloth aron siguraduhon nga walay dust o contamination.

• Reinsert ang circuit breaker trolley sa compartment ug move sa test position. Perform one manual close-open operation cycle. Verify smooth operation, correct mechanical position indication, breaker position indication, ug spring charged/uncharged status.

• Pagkatapos verify, move ang breaker sa service position ug perform power on/off operations as required.

(5) Secondary Circuit Compartment Inspection ug Maintenance

• Check secondary wiring: connections must be tight ug wire labels clear.

• Ensure compartment clean: walay dust o foreign objects.

• Kon kinahanglan, clean ug re-tighten secondary terminals.

III. Annual Electrical Testing

(1) Main Circuit Insulation Resistance Test

• Gamiton ang 2500 V megohmmeter.

• Measured value > 50 MΩ.

(2) Power Frequency Withstand Voltage Test
(Test sa main circuit: phase-to-ground, phase-to-phase, ug across open contacts)

• Pagkahuman sa major maintenance: apply test voltage as per standard.

• During service: apply 80% sa standard test voltage.

(3) Insulation Test sa Auxiliary ug Control Circuits

• Gamiton ang 500 V megohmmeter.

• Measured value > 2 MΩ.

IV. Fault-Based Maintenance (When Required)

(1) Circuit Breaker Operating Position Alignment

• Apply conductive grease o Vaseline sa inner ring sa moving contact.

• Insert ang trolley sa service position ug then withdraw it.

• Use caliper aron masukod ang effective engagement depth sa moving ug stationary contacts sa visible part: should be 15–25 mm.

(2) Circuit Breaker Repair o Replacement

• Carry out in accordance sa manufacturer’s specific technical specifications.

(3) Instrument ug Meter Repair o Replacement

• Carry out in accordance sa manufacturer’s specific technical specifications.