SWITCHGEAR MAINTENANCELakeland, Florida 33810

Tel: 863-686-5667

IF YOU DON’T DO ITTHIS IS WHATHAPPENS!!!!

THIS IS ALL THAT HAS TO BE SAID!!!

ANOTHER REASON FOR MAINTENANCE

It was a cover!

ENVIRONMENT

• Mining

1.Dirt

2.Dust

3.This is the Southeast---HUMIDITY

4.Varmints

A VARMINT

Air Breaker Inspection & Testing

INSPECTION & TEST PROCEDURES1. Visual and Mechanical Inspection

– Inspect physical and mechanical condition.

– Inspect anchorage, alignment and grounding.

– Prior to cleaning, perform as-found tests.– Clean unit.– Verify correct blade/contact alignment &

penetration, travel stop and mechanical operation.

– Verity fuses are support properly, clean contact surfaces and fuse clip tension.

INSPECTION & TEST PROCEDURES cont’d

– Inspect bolted electrical connections for high resistance by: use of a DLRO meter and by checking torque with a calibrate torque wrench.

– Verify phase-barrier mounting is intact.– Verify correct operation of control

devices & interlocks.– Use appropriate lubrication on moving

current-carrying parts and on moving or sliding surfaces.

– Perform as-left tests.

INSPECTION & TEST PROCEDURES cont’d

1. Electrical tests.– Measure contact resistance across the

contacts and fuse holders.– Perform insulation-resistance tests:

• Phase to Phase• Phase to GroundWith the contacts closed & open.

– Perform primary or secondary injection testing.

Vacuum Breaker Inspection Testing

The same procedures as above with the addition of the following:

• Perform a Hi-Pot test or a vacuum bottle integrity test across each vacuum bottle, with the contact in the open position.

VACUUM BOTTLE

Rebuild Medium Voltage breaker

FS6-Gas Breaker

Inspection and Testing Procedures

Perform the same test as performed on the air and vacuum breakers with the exception of:

1. Visual and Mechanical Inspection

• Inspect and service the operating mechanism.• Take a sample for gas analysis• Leak detection • Test the alarms, pressure & limit switches, gas

charge if necessary.• Slow close & open the breaker to allow for

inspection of the contact alignment, binding or other operations.

Inspection and Testing Procedures

1. Electrical testing.– DLRO (contact resistance)– Insulation testing (Megger test)– Perform a contact/pole resistance test.– Perform a trip and close test with the

control and a trip test with the relays.– Perform a power factor test on each pole

(open and closed) and each bushing.

Breaker Schematic

Customer: Job# Date:Location: Sub ID:Make: Amp: Class:Ser #. CHARGE

CLOSE TRIP

AS FOUND

A phase B phase C phase

AS LEFT

A phase B phase C phase

AS FOUND AS LEFT

Breaker Open Breaker ClosedA phase A phase A phase A phaseB phase B phase B phase B phaseC phase C phase C phase C phase

AS FOUND AS LEFT

Breaker Open Breaker ClosedA phase A phase A phase A phaseB phase B phase B phase B phaseC phase C phase C phase C phase

Tested by: Date:Notes:

INSULATION RESISTANCE Readings in Megga-ohms

DC HIPOT TEST (AS LEFT ONLY) 22KV (1) MIN.

Breaker Open Breaker Closed

CONTACT RESISTANCE Readings in Micro-ohms

Breaker Open Breaker Closed

TAW Technical Field Services

Tel: 863-686-5667Fax: 863-683-9806

Lakeland, FL 338105070 Swindell Road

ON-SITE MEDIUM VOLTAGE TEST REPORT

Control Volts:

Addition Equipment to be Maintained

• Protective Relay calibration• Transformers testing• Transformer oil analysis• Surge/Lighting Arresters testing• Load Break Disconnect Switch• GOAB Switch inspection• Infrared Thermography

Transformer Testing• Transformer oil

analysis• Power factor testing

(Doble)• Insulation Resistance

(megger)• Turns to Turns Ratio

(TTR)• Contact Resistance • De-hydrate and De-

gas

SAFETY