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Multi-Differential Relay, MDR-2

Multi-Differential Relay, MDR-2

Product catalog summary

Overview: The document is a technical data sheet for the TCM-2 Thyristor Control Module and the MDR-2 Multi Differential Protection Relay, both designed for use with generators and electric motors. It provides detailed specifications, functionalities, and options for these devices.

TCM-2 Thyristor Control Module:

Designed for relay control in generators and electric motors.
Features include 3-phase AC measurements, dynamic compensation for external failures, and a short response time of 70 ms.
Equipped with a display indicating all measurements.

MDR-2 Multi Differential Protection Relay:

A microprocessor-based control unit for monitoring differential currents in synchronous/asynchronous generators or motors.
Measures phase currents on both sides of the object using current transformers, which define the protection area limits.
Detects errors such as 2- or 3-phase short circuits or earth leaks, providing warnings or tripping signals if preset limits are exceeded.
Features dynamic compensation curves for warning and tripping, defined by the user.
Includes a flexible, menu/PC-programmed interface with password protection.

Standard Functions:

Designed for differential current protection of 3-phase generators/motors.
Inputs include 6 currents via current transformers and 2 binary control inputs.
Outputs include 6 relay outputs, with one for "SYSTEM OK" and 5 configurable relays.
Programmable warning and trip values with delay settings.

Technical Specifications:

Accuracy varies based on current levels, with specific percentages for different ranges.
Operating temperature ranges from -25 to 70°C.
Auxiliary supply requires 12/24V DC with specific protection requirements.
Response times for differential current, block differential current, overcurrent, and short circuit are specified.
Relay outputs have a contact rating of 5 A/250V AC.
Safety and EMC standards are met according to EN and UL regulations.

Available Variants and Options:

Four variants of the MDR-2 are available, with options for display and additional protection features.
Options include overcurrent/short circuit protection and block differential current protection, with specific functionalities for transformers.

Accessories:

Includes operator panels, display gaskets, various cables, and documentation resources.

Ordering Information:

Details on mandatory information and additional options for ordering are provided.

Catalog excerpts

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

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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 through...

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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

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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 protection...

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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) Service...

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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: [email protected], URL: www.deif.com

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Multi-Differential Relay, MDR-2

Multi-Differential Relay, MDR-2

Catalog excerpts

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