Relay protection for cogenerator/utility interface at the distribution voltage level

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:405468

Scheuer, S; Hisey, D C

When a cogeneration plant is connected to a utility power system at distribution voltage levels of 2.4 KV to 34.5 KV, it is subject to system disturbances of various types, duration and degrees of severity. Area utility substation equipment will respond to system upsets by isolating failed or faulted system elements. Though the utility`s protective actions are engineered to maintain customer service, they may inadvertently result in a cogeneration plant going down just when it is most needed by the Owner. Protective Relay schemes for the cogeneration plant must meet the Owner`s expectations for uninterrupted service yet not compromise the utility distribution system. A critical focus of the schemes should be the circuits and equipment interconnecting the plant with the utility. Utilities typically furnish comprehensive interconnection requirements defining the protective relays required on cogeneration plant generators and incoming service components. Compliance is necessary before connection to the utility is permitted. The interconnection requirements often specify relay settings, maximum allowable disconnecting device operating times and acceptable models of the protective relays. While the utility interests are protected by these provisions, the Owner`s needs require further consideration.

• OSTI ID: 405468
• Report Number(s): CONF-951208--
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
24 POWER TRANSMISSION AND DISTRIBUTION
DIAGRAMS
DUAL-PURPOSE POWER PLANTS
EQUIPMENT INTERFACES
EQUIPMENT PROTECTION DEVICES
POWER SYSTEMS
RELAYS