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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Protective Relay Test Adapter Introduction The Protective Relay Test Adapter (referred to in this document as the PRTA) allows an Electric Utility relay testing device (referred to as the Tester) to verify the protective relay functions in a Capstone MicroTurbine. CAUTION The PRTA is designed for use with Electric Utility Testers that supply an output voltage in the range of 0 to 150 Vrms, measured line-to-neutral. This includes Testers made by Doble and Manta. Testers that are capable of producing higher output voltages (such as 0 to 300 Vrms, line-to-neutral) must be set to supply an output voltage in the range of 0 to 150 Vrms, measured line-to-neutral, in order to be used with the Capstone Protective Relay Test Adapter. When using a Tester with an output capability in excess of 150 volts, measured line-to-neutral, it is vital to ensure that the output voltage is not allowed to exceed this value at any time during testing. Applying more than 150 volts to the PRTA can irreparably damage the PRTA. Note that when some Testers are powered-on, they have a default output voltage in excess of 150 Vrms, line-to-neutral, and must be set to a lower output voltage range before any tests are initiated. Electric Utilities commonly require that protective relaying devices be installed with generators connected to their grids. The primary purpose of these devices is to ensure that the generator will cease to energize the Utility wires when the grid voltage or frequency falls outside of a specified range. Historically, these protective relaying devices have been dedicated relays or dedicated solid-state power analyzers that provide control signals to disconnecting relays. In contrast to this, the Capstone MicroTurbine has built-in software-controlled protective relay functions. For detailed information about the MicroTurbine’s protective relay functions, see Protective Relay Functions Application Notes, Capstone Turbine document 512723. The PRTA has two basic functions: • To multiply the voltage output of the Tester to the voltage input required by the MicroTurbine. • To decode the protective relay signal within the MicroTurbine into a signal that the Tester can use to measure the protective relay function trip response time. 410006-001 Rev A (June 2002) Page 2 of 15 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the equipment specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction. NOTE The MicroTurbine supports the Relay Test Mode only if the following software is installed: • C30: System Software v3.7x or higher • C60: System Software v3.8x or higherPDF Image | Technical Reference Protective Relay Test Adapter
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