Idaho Power’s Rule K: Customer’s Load and Operations Tariff, approved by the Idaho and Oregon public utility commissions, outlines limitations related to power quality and reliability.
Idaho Power’s commission-approved “Rule K: Customer’s Load and Operations Tariff,” outlines limitations and responsibilities as they relate to your power quality and reliability, including:
- Equipment that may interfere with service to other customers
- Harmonic control of electronic loads that produce higher current and voltage frequencies than our electrical system can allow
- Requirement for customers to give notice before making significant changes to their electrical equipment
- l汽车服务arger than 7½ horsepower
Knowing your responsibilities under Rule K helps ensure power quality and reliability for your operation and all Idaho Power customers.
Rule K applies to all Idaho Power customers. Harmonics generally affects the large commercial, industrial and irrigation rate classes.
Idaho Power is concerned about harmonic voltage distortion and equipment stresses related to harmonic current distortion. Harmonic voltage distortions occur when a customer’s electronic equipment uses current at frequencies other than Idaho Power’s voltage; these types of currents are called harmonic currents. Harmonic currents interact with Idaho Power’s electrical system and produce harmonic voltage distortion.
Idaho Power’s commission-approved Tariff No. 101 “Rule K” requires all harmonic generating equipment to comply with the Institute of Electrical and Electronics Engineers, Inc. (IEEE) Standard 519-1992, “Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems.” This standard has been approved by the public utility commissions in both Idaho and Oregon.
Many new electronic devices, including those designed to save power, use complicated and rapid electronic switching that causes harmonic interference and disrupts power quality to all customers.
Devices that can cause harmonics include:
- Electrical devices using short duration pulses
- Static power converters (static power converters of electric power are the largest nonlinear loads and are used in industry for a variety of purposes, such as electrochemical power supplies, adjustable speed drives, and uninterruptible power supplies)
- Arc discharge devices
- Induction arc furnaces
- Over voltage transformers (rotating machines to a lesser degree)
- Compact-fluorescent lighting
In order to comply with Rule K, customers using harmonic generating equipment may be required to install additional filters or other harmonic mitigation methods to avoid damaging their own equipment and Idaho Power’s system. These are available from your electrical equipment supplier.
Idaho Power has a responsibility to limit harmonics on its system and will be testing to ensure customer compliance. Customer cooperation with harmonics rules will help Idaho Power improve power quality at customer locations and meet our commitment to provide reliable, responsible energy services, today and tomorrow.
Currently, Idaho Power is testing remaining large industrial loads and non-agriculture water supplies of 50 horsepower or greater that are operated with a variable speed drive (VSD, VFD, ASD).