PSC 113.0701 PSC 113.0701 Definitions. In ss. PSC 113.0701 to 113.0707, the following definitions apply:

PSC 113.0701(1) (1) “Flicker” or “voltage flicker” means a variation of input voltage sufficient in duration to allow visual observation of a change in electric light intensity.

PSC 113.0701(2) (2) “Harmonic distortion” means the mathematical representation of the distortion of the pure sine waveform. Distortion of the pure sine waveform is typically caused by loads that draw current discontinuously or whose impedance varies during the cycle of the input ac voltage waveform.

PSC 113.0701(3) (3) “Point of service” means the connection point between the customer electrical system and the utility electrical system.

PSC 113.0701(4) (4) “Power quality” means the concept of powering and grounding sensitive electronic equipment in a manner that is suitable to the operation of that equipment.

PSC 113.0701(5) (5) “Retail power service” means service furnished principally for electromotive or industrial purposes and may include service for lighting incidental thereto, as defined in the utility’s rates and rules.

PSC 113.0701(6) (6) “Sag” means an rms reduction in the ac voltage, at the power frequency, for durations from a half-cycle to a few seconds.

PSC 113.0701(7) (7) “Swell” means an rms increase in the ac voltage, at the power frequency, for durations from a half-cycle to a few seconds.

PSC 113.0701(8) (8) “Transient” means a subcycle disturbance in the ac waveform that is evidenced by a sharp but brief discontinuity of the wave form. A transient may be of either polarity and may be additive to or subtractive from the nominal waveform.

PSC 113.0701 Note Note: The definitions used in subsections (1), (2), (4), (7), and (8) are based on the definitions in Authoritative Dictionary of IEEE Standards Terms-7th Ed.

PSC 113.0701(9) (9) “Steady state voltage” means the rms voltage after all sags, swells and transients have decayed to a negligible value.

PSC 113.0701(10) (10) “Service voltage” means the steady state voltage at the point of service.

PSC 113.0701 History History: Cr. Register, July, 2000, No. 535, eff. 8-1-00; correction in (intro.) made under s. 13.93 (2m) (b) 7., Stats., Register, January, 2001, No. 541; CR 02-027: am. (1), (2), (4) and (6) to (8), Register December 2002 No. 564, eff. 1-1-03.

PSC 113.0702 PSC 113.0702 Standard and maintenance of a service voltage. Each utility shall adopt standard nominal service voltages for each of the several areas into which the distribution system or systems may be divided and shall file with the commission a statement of the standard voltages adopted. The service voltage shall be reasonably constant within the following limits:

PSC 113.0702(1) (1) For all retail service, except retail power service, the service voltage shall not vary by more than 5% above or below the standard voltage.

PSC 113.0702(2) (2) For retail power service furnished to customers having demands of 500 kilowatts or less, the service voltage shall be no more than 5% above or 10% below the standard nominal voltage.

PSC 113.0702(3) (3) For retail power service furnished to customers having demands of more than 500 kilowatts, the service voltage shall not vary by more than 10% above or 10% below the standard nominal voltage.

PSC 113.0702(4) (4) For polyphase voltage unbalance issues, ANSI C.84.1-1989 Appendix D is the reference that will be followed. The utility and its customers may agree to not be constrained to the reference if it is economically beneficial to the customer.

PSC 113.0702(5) (5) For service rendered to public utilities and others for resale the standard nominal voltage shall be as mutually agreed upon by the parties concerned. If no formal agreement exists, the standard nominal voltage shall vary by no more than 10% above or below the secondary nominal voltage.

PSC 113.0702(6) (6) The variation in service voltage referred to in subs. (1) to (3) inclusive shall refer to a steady state voltage.

PSC 113.0702(7) (7) Upon customer request, the utility shall investigate line voltage variations and disturbances, associated with voltage sags, swells and transients, at the point of service. Requests for tests may be limited in availability, number or frequency for the same customer at the same location where previous tests have indicated that the variations and disturbances are within acceptable industry limits. The utility may establish rules for certain customers to decrease the incidents of these variations and disturbances as seen by other customers.

PSC 113.0702 History History: Cr. Register, July, 2000, No. 535, eff. 8-1-00.

PSC 113.0703 PSC 113.0703 Variations of voltage.

PSC 113.0703(1) (1) Service interruptions, or voltage sags, swells and transients caused by the action of the elements, temporary separation of parts of the system from the main system, infrequent or unavoidable fluctuations of short duration, equipment failure, normal system operations necessary operations to safeguard employees or the general public, or other causes beyond the control of the utility shall not be considered a violation of these rules.

PSC 113.0703 Note Note: Voltage fluctuations, transients, sags and swells may affect the performance of certain types of equipment or operations and should be considered by the customer. Customers having equipment or operations that are sensitive to such voltage fluctuations, or that require service other than that specified by these rules may find it necessary to install, at their own expense, power conditioning equipment or other modifications to protect, mitigate or otherwise provide the type of service needed.

PSC 113.0703(2) (2) In order to limit the impact of voltage variations, utilities may establish starting and operating criteria for equipment on customer premises. Customer loads shall be sized and operated in accordance with such criteria.

PSC 113.0703(3) (3) If procedures for voltage reduction during emergency operating conditions have been filed with and accepted or approved by the commission, variations of voltage in excess of those specified in ss. PSC 113.0702 and 113.0703, resulting from implementation in accordance with the specified procedures, shall not be considered a violation of these rules.

PSC 113.0703 History History: Cr. Register, July, 2000, No. 535, eff. 8-1-00.

PSC 113.0704 PSC 113.0704 Harmonics of 60 Hz voltage waves. Utilities shall make reasonable efforts to investigate equipment operating problems suspected to be associated with harmonic distortion of the 60 Hz voltage sinewave at the point of service. When the source of the harmonic distortion is determined to be equipment operated by a specific customer, the utility shall notify the customer and it shall be the customer’s responsibility to correct the problem. When corrective action is necessary, the guideline to be used is the 1992 IEEE Standard 519.