Register January 2017 No. 733
Chapter PSC 119
RULES FOR INTERCONNECTING DISTRIBUTED GENERATION FACILITIES
Subchapter I — General
Subchapter II — General Requirements
Designated point of contact.
Application process for interconnecting DG facilities.
Insurance and indemnification.
Modifications to the DG facility.
Easements and rights-of-way.
Fees and distribution system costs.
One-line schematic diagram.
Subchapter III — Design Requirements
General design requirements.
Minimum protection requirements.
Subchapter IV — Equipment Certification
Certified paralleling equipment.
Non-certified paralleling equipment.
Subchapter V — Testing of DG Facility Installations
Commissioning tests for paralleling equipment in Categories 2 to 4.
Right to appeal.
PSC 119.01 Scope.
This chapter implements s. 196.496
, Stats. It applies to all DG facilities with a capacity of 15 MW or less that are interconnected, or whose owner seeks to have interconnected, to an electric public utility's distribution system. It also applies to all electric public utilities to whose distribution systems a DG facility is interconnected, or to which interconnection is sought. These rules establish uniform statewide standards for the interconnection of DG facilities to an electric distribution system.
PSC 119.01 History
History: CR 03-003
: cr. Register January 2004 No. 577
, eff. 2-1-04.
PSC 119.02 Definitions.
In this chapter:
“ANSI" means American National Standards Institute.
“Applicant" means the legally responsible person applying to a public utility to interconnect a DG facility to the public utility's distribution system.
“Application review" means a review by the public utility of the completed standard application form for interconnection, to determine if an engineering review or distribution system study is needed.
“Category 1" means a DG facility of 20 kW or less.
“Category 2" means a DG facility of greater than 20 kW and not more than 200 kW.
“Category 3" means a DG facility of greater than 200 kW and not more than 1 MW.
“Category 4" means a DG facility of greater than 1 MW and not more than 15 MW.
“Certified equipment" means a generating, control or protective system that has been certified by a nationally recognized testing laboratory as meeting acceptable safety and reliability standards.
“Commission" means the public service commission of Wisconsin.
“Commissioning test" means the process of documenting and verifying the performance of a DG facility so that it operates in conformity with the design specifications.
“Customer" means any person who is receiving electric service from a public utility's distribution system.
“Distribution feeder" means an electric line from a public utility substation or other supply point to customers that is operated at 50 kV or less, or as determined by the commission.
“Distribution system" means all electrical wires, equipment, and other facilities owned or provided by a public utility that are normally operated at 50 kV or less.
“Distribution system study" means a study to determine if a distribution system upgrade is needed to accommodate the proposed DG facility and to determine the cost of any such upgrade.
“Engineering review" means a study that may be undertaken by a public utility, in response to its receipt of a completed standard application form for interconnection, to determine the suitability of the installation.
“Fault" means an equipment failure, conductor failure, short circuit, or other condition resulting from abnormally high amounts of current from the power source.
“IEEE" means Institute of Electrical and Electronics Engineers.
“Interconnection" means the physical connection of a DG facility to the distribution system so that parallel operation can occur.
“Interconnection disconnect switch" means a mechanical device used to disconnect a DG facility from a distribution system.
“Inverter" means a machine, device, or system that converts direct current power to alternating current power.
“Islanding" means a condition on the distribution system in which a DG facility delivers power to customers using a portion of the distribution system that is electrically isolated from the remainder of the distribution system.
“Material modification" means any modification that changes the maximum electrical output of a DG facility or changes the interconnection equipment, including: