Substation Relay Technician

About CORE

CORE Electric Cooperative is the largest member-owned electric distribution cooperative in Colorado dedicated to providing reliable, affordable, clean, and safe electric service to our communities.

With a commitment to innovation and member satisfaction, we strive to meet the evolving needs of our members while maintaining the highest standards of service excellence.

Job Summary 

This position reports to the Substation Manager and is primarily responsible for programming, testing, and commissioning of protection and control systems.

The position educates all Substation department classifications regarding protection and control systems programming, testing, and commissioning.

Additional responsibilities include the operation, maintenance, and commissioning of substation apparatus including interrupting devices, isolating devices, power transformers, and voltage regulators.  Procedures are applied to determine the best course of action within the limits of standard practice.

Essential Duties and Responsibilities


* Program, test, and commission protection and control systems following the latest NERC PRC-005 – Protection System, Automatic Reclosing, and Sudden Pressure Relaying Maintenance Standard for the following Protection System Components.
+ Protective Relays
+ Communications Systems
+ Voltage and Current Sensing Devices
+ Protection System Station DC Supply
+ Control Circuitry Associated with Protective Functions


* Programming, testing, and commissioning of the following protection schemes.
+ Feeder overcurrent, under-frequency, and automatic reclosing
+ Transformer differential and overcurrent
+ High-impedance bus differential
+ Breaker failure
+ Transmission line directional and distance protection
+ Transmission line communications-assisted tripping (POTT, DCB)
+ Transmission line current differential (two- and three-terminal)
+ Others as required


* Educate all Substation department classifications regarding protection and control systems programming, testing, and commissioning. 


* Interpret electrical prints including one-line, three-line, schematic, and wiring diagram drawings for testing, troubleshooting, and modification purposes.


* Informs Substation Working Foreman of daily work progress and problems encountered.


* Conduct and/or participate in Job Briefings on the worksite daily and any time scope or method of work changes.


* Perform vehicle pre-trip inspections and report issues.


* Assists in the training of Substation Technician I (Apprentice).


* Perform testing, maintenance, and commissioning of substation equipment involving routine inspection, repair, and modification or addition as needed.


* Perform switching on substation and transmission line equipment.


* Perform routine maintenance, minor repairs, and adjustments of hi...