Glossary of Electric Utility Industry Terms


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E

Earth – As a verb, to connect to the ground, or earth, with an electrical conductor. As a noun, the connection between a piece of equipment and the earth or ground. (or the connection between a conductor and ground) (EUSO-photo, EDS, CAEDS, IESO-photo)

Earthing – Connecting to the ground, or earth, with an electrical conductor. In North American the term grounding in commonly used, but in many countries the term earthing is used. (EUSO-photo, EDS, CAEDS, IESO-photo)

Edison Electric Institute – A Washington, DC-based organization for investor-owned electric utilities that was formed in 1933. It represents its members’ interests in legislative and regulatory issues. The Edison Electric Institute (EEI) has developed one of the standards for using upper-and-low-case letters for electrical units. The EEI standard states that any unit based on a person’s name must be capitalized. For instance, when writing kVA, kilo represents kilo and so it is lower case. V is named after Mr. Volta and A is named after Mr. Ampere and so both V and A are upper case. www.eei.org

EEI – See for Edison Electric Institute.

E-Tag – An electronic label, or tag, placed on an energy transaction. These labels provide the source of the power, where the power is going, and the beginning and ending time of the transaction. These labels assist transmission operators to minimize congestion problems while maximizing reliability. (EUSO)

Elbow – A 90-degree connector used in pad mounted transformers. Elbows are designed to be pulled off with a hot stick with full-load current flowing and are also called load-break elbows. (EDS)

Electric Reliability Organization – An organization authorized by the federal Energy Policy Act of 2005 with authority to enforce compliance with reliability standards within North America. Prior to this Act, compliance with reliability standards were voluntary. This allowed utilities to pick and choose which reliability they wanted to adhere to. Utilities choosing to not adhere to these standards resulted in the August 2003 Northeast U.S. blackout. (EUSO, System operator classes)

Electric Reliability Council of Texas, The - (ERCOT). See the North American Electric Reliability Council. (EUSO, System operator classes)

Electrical Potential – The force that causes electrons to flow. It is more commonly called voltage. (EUSO, IESO)

Electromotive Force – The force that causes electrons to flow. It is more commonly called voltage. (EUSO, IESO)

EMC – Electric membership corporation.

EMF – An acronym for ElectroMotive Force - A force that causes electrons to flow. It is more commonly called voltage. (EUSO, IESO)

EMF – An acronym for Electric and Magnetic Fields which is also called ElectroMagnetic Fields. Electric and magnetic fields are the two fields produced, respectively, by voltage being present and the flow of current. (EUSO, CAEDS, EDS, IESO)

EMS – An acronym for Energy Management System. An EMS is a computer system used to remotely monitor and control an electrical or electromechanical system. The computer has the capability to analyze the system in real time, compare it to past trends or preset indicators, and then adjust the operation in order to maximum reliability and efficiency, all with minimum human interaction. (EUSO)

Energizing – The process of applying electrical power to a piece of equipment or to a customer.

Energy – The quantity produced when power is produced, or consumed, over a period of time. In the electrical power world, it is expressed in kilowatt-hours and Megawatt-hours. (EUSO)

Energy Management System – A computer system used to remotely monitor and control an electrical or electromechanical system. The computer has the capability to analyze the system in real time, compare it to past trends or preset indicators, and then adjust the operation in order to maximum reliability and efficiency, all with minimum human interaction. (EUSO)

EPR – Ethylene Propylene Rubber – The second most common primary underground cable insulation. (The most common is XLP) EPR is not as good an insulator as XLP. EPR is softer and more flexible. It has higher current-carrying capability when rated at 105°C. EPR when rated at 105°C is also called MV-105, with MV representing medium voltage. (EUSO, CAEDS, EDS, IESO)

ERO – See Electric Reliability Organization. (EUSO, CAEDS, EDS, IESO)

ERCOT – An acronym for the Electric Reliability Council of Texas. See North American Electric Reliability Council. (EUSO, System operator classes)

Excitation System – The direct-current system in a generating plant used to make the rotating part of a generator into a magnet. (EUSO-photo)

Exciter – The source of the direct current in a generating plant. The direct current is used to make the rotating part of a generator into a magnet. (EUSO)

Exponential Decay – Usually refers to the rate voltage decreases, or decays, on a capacitor or on shielded underground cable. The term exponential refers to a family of curves called exponential curves that are mathematically defined. (EUSO, IESO)


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