Section PSC 119.25 - Minimum protection requirements(1) Each DG facility shall include protection and unintentional islanding equipment to prevent the facility from adversely affecting the reliability or capability of the distribution system. The applicant shall contact the public utility to determine any specific protection requirements.(2) The protective system functions, which may be met with microprocessor-based multifunction protection systems or discrete relays, are required. Protective relay activation shall not only alarm but shall also trip the generator breaker/contactor.(3) In addition to unintentional islanding protection, a DG facility shall meet the following minimum protection requirements:(a) A Category 1 DG facility shall include:1. Over/under frequency function.2. Over/under voltage function.4. Ground fault protection.(b) A Category 2, 3, or 4 DG facility shall include: 1. Over/under frequency function.2. Over/under voltage function.4. Ground fault protection.5. Synchronism check function.6. Other equipment, such as other protective devices, supervisory control and alarms, telemetry and associated communications channel, that the public utility determines to be necessary and is compliant with applicable codes and standards. The public utility shall advise the applicant of any communications requirements after a preliminary review of the proposed installation.(4) A DG facility certified pursuant to s. PSC 119.26 shall be deemed to meet the requirements of this section.Wis. Admin. Code Public Service Commission PSC 119.25
CR 03-003: CR Register January 2004 No. 577, eff. 2-1-04.Amended by, CR 22-077: am. (1), (3) (intro.), (b) 6. Register April 29 No. 820, eff. 5/1/2024