Earthfault-Detection-Relay EOR-D - a. eberle - #1

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1 A. Eberle GmbH&CoKG Technical Data Earthfault- Detection- Relay T_EOR_D_20040206_1 EOR-D * as wall-mounting version * as modular version * as 19" mounting rack version Application To make use of the advantages of the various detection methods in different earthfault-situations, the freely programmable earthfault-detection-relay EOR-D makes it possible to select and combine the following earthfault detection methods: .. Transient-Method with qu-algorithm • Up to fault resistance of some kOhm • Restriking and intermittent earthfaults .. Harmonics-Method • Compare of amounts • Direction of reactive power .. Wattmetric-Method • Direction of active power • Increase of active current .. Pulse-Method ( => location in depth ) The basic unit has been designed for the supervision of up to 4 feeders; a 19"- rack can be equipped with up to 4 relays. Therefore at present up to 16 feeders can be monitored using one 19"-rack. Additional digital inputs or outputs can be easily obtained by using REGSys components. In combination with the PC-software WinEOR the following functions can be realized: .. Parameterisation of the relay • Detection method • Trigger level • Configuration of signalling • Test of current transformer direction .. Fault-analysis • Logbook • Record of transients ( 10 kHz ) • qu-algorithm .. Net-analysis • Data logger • Evaluation of the line capacity per each feeder Characteristics of the Methods Transient-method using qu-algorithm .. Suitable for earthfaults up to some kOhms .. Suitable for restriking and intermittent earthfaults .. The threshold voltage of the zero-sequence voltage VNE can be adjusted .. The equivalent threshold current of the zero-sequence capacity can be adjusted .. Suppression of the earthfault-indication depending on a selectable minimum duration of the earthfault .. Suppression of earthfault-indications in direction to busbar .. Reset of the indication by an external signal or automatically after a certain period or at the end of the earthfault ( can be selected or combined ) .. Recording of the transient event in the logbook .. Recording of the transients over 10 periods with a sampling rate of 10.24 kHz Figure 1: Functions of the earthfault-detection-relay EOR-D 1 voltage transformer ( 4 x zero-sequence-voltage) 2 current transformer ( 4 x zero-sequence-current ) 3 binary inputs ( 16 x ) 4 power supply 5 measured value signal conditioning and analysis 6 relay-outputs ( 6 x ) 7 E-LAN connection (2 x RS485 with repeater ) 8 COM1, RS232 9 COM2, RS232 ( optional ) 10 COM3, RS485 ( optional ) RS232 RS232 RS485 E-LAN RS485 1 2 3 4 5 6 7 8 9 10 COM 1 COM 2 COM 3 ìP LED RAM ROM Clock DSP