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Busbar specification Protection and control unit Since the Protection and Control unit is installed in the switchgear, it must meet the severest environmental withstand requirements, in particular: IEC standards: 60255-5 impulse withstand: 5 kV 60255-22-1 1Mhz wave: Class III 60255-22-4 fast transients: Class IV 61000-4-3 electromagnetic radiation: class III 60529 degree of protection: IP 52 on front panel 60255-21-1,2,3 vibration, shocks, earthquakes: class II The operating temperature shall be between -25°C and + 70° C. One unit shall be designed to accommodate all types of control power supply voltages: 24, 48, 127 & 220 Vdc and 110 & 230 Vac. The design and manufacturing process shall be ISO 9001 certified. The Protection and Control Unit shall have UL and CSA certification. It should be possible to withdraw the unit without prior current circuit short-circuiting The control output relays shall be capable of withstanding steady state current of 8 A. Operating dependability The Protection and Control unit shall include: an internal function self-monitoring mechanism, which activates one fail-safe watchdog changeover contacts an automatic device for switching to the fail-safe position, disabling output controls when a major internal failure is detected indication of self test status of the device by LED and text. Installation The Protection and Control unit should be compact and easy to install reduced depth (<100 mm) remote optional modules shall be prewired Protection The Protection and Control Unit shall contain all the necessary protections for the specific application: Busbar protection 27D/47 Positive sequence undervoltage 27R Remanent undervoltage 27 Phase-to-phase undervoltage 27S Phase-to-neutral undervoltage 59 Phase-to-phase overvoltage 59N Neutral voltage displacement 81H Overfrequency 81L Underfrequency 81R Rate of change of frequency Setting shall be performed by the direct input of actual current values. Protection tripping shall be indicated on the front of the device by a LED and text indicating the cause of the fault. Metering Man Machine Interface (front panel) Each Protection and Control unit shall include the measurements needed for operation and commissioning, i.e. at least the following : phase to phase and phase to neutral voltage measurement residual voltage measurement positive sequence voltage measurement frequency The unit shall provide one of the measurement on an analog output The Protection and Control unit shall include a display unit that indicates: measurement values operating messages (choice of language English or local) device maintenance messages The display unit shall have as a minimum 2 lines for clear annunciation of alarm conditions. 8 Signals LEDs will be available for alarms and status, including: breaker position (open/closed), relay self test, phase fault and earth fault alarms. It shall be possible to customize the assignment of the signal LEDs. The display indication shall be in 2 languages English Local The Protection and Control unit shall include a keypad to allow to perform the following operations: display of metering and operating data, alarm messages clearing of alarms and resetting, acknowledgement access to protection settings access to the unit parameter settings Access to setting mode will be protected by 2 different customized passwords of at least 4 characters: 1 to protect access to the protection settings, the other to protect access to the unit parameter settings. It shall be possible to remote the MMI to allow installation of the Protection and Control unit in a different place than the MMI for the most advantageous location for operation & monitoring. Control and monitoring The Protection and Control unit shall include the logic inputs and outputs resources required for control of the breaking device (circuit-breaker or contactor) and for interfacing with the monitoring or logic process. The unit shall have at least 4 relay outputs, with extension capability up to 10 logic inputs and 8 relay outputs Extension of the number of logic inputs and outputs will be possible to : CB open and close control, whatever the type of shunt trip or undervoltage release coil control ANSI 69 / Inhibit closing Remote tripping As an option, monitoring of the circuit breaker for maintenance statistics purpose: operating time, charging time, trip circuit supervision (covering power supply, wiring and coil) cumulative total of tripping currents for 5 current ranges, operation counter, pressure (for SF6 circuit breakers) As an option, monitoring the temperature (motors, transformers) storage of information (even during control power supply outages). 1 analog output will be available as an extension to the Protection and Control unit. Disturbance recording: Triggered on event (automatic or manual) Each record will allow to store data for at least 80 periods, 12 values per period, with a number of periods before the event according to the setup The content of the record will be, as a minimum, the date, channel characteristics, 4 current channels (I1, I2, I3, I0) and the digital inputs The number of records will be as a minimum 2 events The event format shall be COMTRADE 97 The unit will provide time-tagging of minimum 64 events within an accuracy of 1ms. Communication The Protection and Control unit will be supplied with a Communication interface option of the RS 485 type, up to 38 400 baud speed, Modbus Protocol. The response time for a control order will be less than 15 ms (time from order sent to the unit up to order acknowledgement) The Protection and Control unit will communicate the metering data, enable the remote readings of the protection settings, the remote setting of protection and the transfer of the disturbance recorded data. Remote control orders shall be carried out in 2 modes : Direct mode "SBO" (select before operate) mode A RS232 connection port shall be available in the front of the relay, allowing to communicate between the relay and a PC with the appropriate software. Software Appropriate software (using standard Windows 95 or NT operating system) will allow to collect: all metering and operating data, alarm messages breaker diagnostics data (cumulative tripping current, operating counter…) protection and parameter settings, logic status of inputs, outputs and signal LEDs. (download to/from the relay) disturbance recording: single or multi curve display, 2 pointers for differential measurement, zooming, printing.