This fabrication and erection specification of Commissioning High Voltage Circuit Breakers Contactors Switches defines the work practices that are required to properly commission and maintain high voltage circuit breakers/contactors/switches and control. It is not intended to serve as a work scope or limit the extent of work required to operate this equipment.

We will discuss to the visual and mechanical inspections, as well as the electrical and function testing of high voltage circuit breakers/contactors/switches and control.

Commissioning High Voltage Circuit Breakers Contactors Switches

Switches, circuit breakers, and contactors are used to control what parts of an electrical system are energized or de-energized. Fuses are used to protect the electrical system when something goes wrong, and can isolate the faulted parts from the normal parts.

Engineering Documents

• Electrical Equipment Commissioning
• Commissioning: High Voltage Switchgear and/or Contactor Cubicles
• Electrical Work

Commissioning task types

This section defines the responsible personnel types for each of the specific commissioning tasks that appear on the Electrical Commissioning Start-up Checklist. All tasks shall be completed. If a type A or B task is not completed during its appropriate commissioning time, then the A and B task shall be included in the type C commissioning responsibilities.

1.  “A” – Tasks performed by the contractor, authorized supplier, or electrical technician personnel. Test reports must be provided and available.
2. “B” – Pre-energization tasks performed or witnessed by electrical technician personnel. These tasks may be performed by an approved supplier without electrical technical personnel present. Supplier approval shall be given by the appropriate electrical engineering operation support group and Electrical Engineering. Test reports must be provided and available.
3. C” – Tasks performed by electrical technician personnel during the commissioning of the equipment.

Electrical commissioning/start-up checklist

High Voltage Circuit Breakers/Contactors/Switches Nameplate Data

Date:___________  Facility:_____________________ Equipment Location:______________________ Project #: _____________

Equipment Designation:______________________________________ Unit # _______ of _______ Units

Manufacturer:_______________________________

Serial number:______________________________

Model number:______________________________ Type:_____________________________________

Equipment Rating:_______________ Volts:_________________ Amps:__________ Amps S/C:___________

Technician:_________________________________________ Sheet # ____ of ____

Visual and Mechanical Inspection for all Equipment

• Upon receipt of the equipment, inspect for physical damage caused by shipping. Report incidences as per shipper’s instructions.
• Compare equipment nameplate information with the latest single line diagram and equipment specifications.
• Ensure proper cell fit and alignment.
• Perform all mechanical operation and contact checks on both the breaker and its operating mechanism in accordance with the manufacturer’s instruction literature.
• Perform normal preventative maintenance using the manufacturer’s instruction literature.
• Verify contact wipe, alignment, spacing, and other parameters which are vital to satisfactory operation. Verify operation of charging mechanism, cutoff switches, and auxiliary relay and/or interlocks. See addition tasks for appropriate special types of equipment.
• Upon completion of above tasks, clean and lubricate the primary and secondary contacts with approved lubricant. Insulation resistance (Megger) test and function test using the remote test stand. Use the test position if the remote test stand is not available.
• Verify the proper and complete operation of all mechanical and electrical interlocks including any key-type system.

Operational and Electrical Testing for all Equipment

• Perform physical wire check and electrically function check each field device to verify that it drops out the proper shutdown relay or starter.
• Calibrate all protective relays in accordance with the latest International Electrical Testing Association (NETA) Acceptance Testing Specification Section 7.9.1 for Electromechanical Relays and 7.9.2 for Microprocessor based relays and applicable manufacturer’s recommendations; Relay software revision and setting file software revision must match. Utilize Electrical Engineering job specific relay settings. Record results. Send as left files to Electrical Engineering.
• Verify that each fail-safe and/or protective relay trips the breaker or starter. Record results.
• Set, check and verify all time delay relays for proper timing and operation.
• Perform contact resistance with the breaker/switch in the closed position using a digital low resistance ohmmeter (Ductor). Refer to the manufacturer’s instruction literature for the maximum value. If there is none listed, use 300 micro-ohms (0003 ohms). Calculate the average of three readings for each phase. The value should be within 10% of each other. Record results:
• Insulation resistance (Megger) test each pole with the breaker/contactor/switch closed. Test phase-to-phase and phase-to-ground for one minute. Record results:
• During the start-up period a jumper log must be maintained. Following control circuit testing check for any “test” jumpers that may have inadvertently been left on.

High Voltage Switch Checks

• Check blade alignment and arc interrupter operation and clearances. Refer to the manufacturer’s instruction literature.
• Check fuse/ linkage and element for proper holder and current rating.
• Exercise switch 2 to 3 times to verify proper operation.
• Ensure line side of switch is terminated on the stationary contact of the switch. Where this is not the case, consult Electrical Engineering.
• Verify spare fuses are the correct rating and the fuse puller is provided.

Vacuum Circuit Breaker/Contactor Checks

• Perform a high potential test on each interrupter for one (1) minute.
• Caution: Read manufacturer’s instruction literature concerning the X-radiation hazards and voltage levels. Record results.
• Verify tolerances for erosion, contact travel, and overtravel as per manufacturer’s instruction literature.
• Verify initial contact wear position indicator.
• Refer to the manufacturer’s instruction literature under the installation and maintenance sections to describe procedures and checks recommended.

SF6 Circuit Breakers Checks

• Refer to the manufacturer’s instruction literature under the installation and maintenance sections to describe procedures and checks recommended.
• Verify SF6 low pressure alarm in accordance with manufacturer’s published data.

Documentation

Complete nameplate data information and test results.

Complete Report 1, Electrical Protective Device Verification Report.

Complete Report 2, Circuit Breaker/Contactor/ Switch Test and Inspection Report.

One copy of the completed documentation shall be filed on site for future reference and one copy shall forwarded to Air Products PDO Electrical Engineering.

Report 1

Electrical Protective Device Verification Report

Date:__________

Facility:__________________ Equipment Location: __________________ Project :______________

Equipment Designation/Tag #:__________________________ Unit # ________ of ____________ Units

Manufacturer:_____________________________ Serial number:______________________________

Model number:____________________________ Type:______________________________

Equipment Rating:____________________ Volts:_________________ Amps:___________________

Technician:___________________________ Test Set:________________ Sheet # ______ of ______

Device Function	Function		Trip Function		Phase		Tested
Number			86 L0.	Breaker		By Date
50	Instantaneous Overcurrent (IIT) 51 Time Overcurrent (ITH&CO)
74	Time Overcurrent Alarm (CO)
47	Undervoltage Phase Sequence
87	Current Differential
40/48	DC Field Failure/ Incomplete Sequence 55/48 Power Factor/ Incomplete Sequence 46 Phase Balance Current Relay
27	Breaker D.C. Undervoltage Release (Emergency Trip)
27	DC Control Circuit Undervoltage
81	Underfrequency
26	D.C. Field Thermal Trip
49	Stator Temperature
62-1	Auxiliary Device Time Delay Trip 62-2 Auxiliary Device Time Delay Trip 50 GS Instantaneous Ground Current (ITH) Remarks:__________________________________________________________________ _________________________________________________________________________________ Report 2 Circuit Breaker/Contactor/Switch Test and Inspection Report Date:__________ Facility:__________________ Equipment Location: __________________ Project #:______________ Equipment Designation/Tag #:__________________________ Unit # ________ of ____________ Units Manufacturer:_____________________________ Serial number:______________________________ Model number:____________________________ Type:______________________________ Equipment Rating:_____________ Volts:_____________ Amps:___________ Amps S/C: _____________ Technician:___________________________ Test Set:________________ Sheet # ______ of ______ OUTAGE TYPE EQUIPMENT FUNCTION Equipment Designation Scheduled Distribution Feeder/Breaker/Switch Unscheduled Motor Feeder Breaker/Contractor Manufacturer Starting Breaker/Contactor Running Breaker/Contactor Voltage Neutral Breaker/Contactor PROTECTIVE RELAY INSPECTION I.B. Calibrated Other: Function Tested Drive Motor Type Visual Inspection Only N/A Induction Synchronous N/A FAIL-SAFE CIRCUIT CHECKLIST Device Number Specification As Found As Left Circuit Revisions or Changes Switchgear Counter Reading Start Finish Switchgear Unit Number Switchgear Checklist Inspected Adjusted_____________________________________________ Cleaned Tested Meggered ( to and to GND) Contact Condition Lubricated Tightened Connections ____________________ Repaired Remarks Field Excitation Equipment Stand Alone Rectifier – E.P.M. Complete Yes No Field Application Panel – E.P.M. Complete Yes No Like this: Like Loading… Discover more from PAKTECHPOINT Subscribe to get the latest posts sent to your email. Type your email… Subscribe Electrical Field Testing Share this article WhatsApp LinkedIn Facebook Copy link Advertisement Keep reading Jan 31, 2024Polarity Check Procedure of Voltage Transformer Jan 31, 2024Voltage Withstand Test Procedure of Voltage Transformer Jan 31, 2024Winding Resistance Test Procedure of Voltage Transformer Leave a Comment Cancel reply Comment Name Email Website Notify me of follow-up comments by email. Notify me of new posts by email. %d