Multi-Differential Relay, MDR-2
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TCM-2 Thyristor Control Module TCM-2 Thyristor Control Module DATA SHEET DATA SHEET DATA SHEET Multi differential protection relay, MDR-2 Relay for generators/electric motors 3-phase AC measurements Dynamic compensation for ext. failures Short response time (70 ms) Display indicating all measurements

Data sheet Multi differential protection relay, MDR-2 The MDR-2 differential protection relay is a microprocessor-based control unit containing all necessary functions for monitoring of the differential currents for a synchronous/asynchronous generator or motor (the object). Via current transformers the MDR-2 measures each phase current on both sides of the object. The current transformers determine the limits of the protection area. Any failure within these limits (2- or 3-phase short circuits or earth leaks) will be detected as an error Id: Differential currents, the currents flowing...

Data sheet Multi differential protection relay, MDR-2 Principle diagram, option C4 AC CURRENT MEASUREMENT SECONDARY SIDE AC CURRENT MEASUREMENT SECONDARY SIDE AC CURRENT MEASUREMENT PRIMARY SIDE AC CURRENT MEASUREMENT PRIMARY SIDE

Data sheet Multi differential protection relay, MDR-2 Available variants MDR-2 with display and display cable MDR-2 with display, display cable and option C3 MDR-2 with display, display cable and option C4 Generator add-on protection package Available options Overcurrent/short circuit protection (option C3): - Option type 2 x definite time or inverse time (curve with six programmable points) overcurrent protection (400% overcurrent max.) 1 x definite time short circuit protection (500% short circuit current max.) Block differential current protection (option C4): The block differential...

Data sheet Multi differential protection relay, MDR-2 Technical specifications Galv. separation: Between AC inputs and others: 3250V AC – 50 Hz – 1 min. EMC/CE: Current: Max. 4 mm2 (multi-stranded) 6 mm2 (single-stranded) (UL/cUL Listed: Max. surrounding air temp.: 55°C/131°F) Climate: Tightening torque: 0.5-0.6 Nm (4.4-5.3 lb-in) Meas. frequency: 30...70 Hz (nominal 50 Hz or 60 Hz) Aux. supply: Tightening torque: 0.5-0.6 Nm (4.4-5.3 lb-in) The aux. supply inputs are to be protected by a 2 A slow blow fuse (UL/cUL Listed: AWG 24) Binary inputs: Input voltage: 6...32V DC (bi-directional)...

Data sheet Multi differential protection relay, MDR-2 Dimensions Order specifications Variants Mandatory information Item no. Additional options to the standard variant Variant no. Example: Mandatory information Additional options to the standard variant Accessories Mandatory information Item no. Example: Mandatory information Item no. Due to our continuous development we reserve the right to supply equipment which may vary from the described. DEIF A/S, Frisenborgvej 33 DK-7800 Skive, Denmark Tel.: +45 9614 9614, Fax: +45 9614 9615 E-mail: deif@deif.com, URL: www.deif.com