Name: MRR1-D Multifunctional Generator Rotor Protection Relay
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MRR1-D Multifunctional Generator Rotor Protection Relay

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Description

Overview

Essential details：MRR1-D Multifunctional Generator Rotor Protection Relay

Product Description

The generator rotor protection relay MRR1 com-bines rotor earth fault protection, excitation overand undercurrent protection as well as rotating diode failure protection.
Thus providing a powerful protection regarding the rotor of synchronous generators, covering the following ANSI codes:
37 DC undercurrent relay
40 Field relay
58 Rectification failure relay
64 Ground detector relay
76 DC over current relay
The MRR1 is recommended for synchronous generators and motors above 1 MVA rating.
The rotor earth fault element detects high- and low resistance earth faults of the rotor winding. It is equipped with two stages, one for alarm, one for trip.
The excitation current protection element super-vises the DC excitation current of brushless excitor machines. The protective functions are: Undercurrent, over current and ripple detection for diode failure protection.

MRR1-D

Product parameter

Besides features described in the general MR-description, MRR1 provides:
 Detection of high impedance earth faults with a test frequency of 0.5 Hz
 Short circuit and overvoltage proof measuring input for the earth fault protection
 Excitor current measurement galvanically isolated via Hall-transducer, measuring range 0 to 20 A
 Display of insulation resistance
 Display of the excitation current
 Excitation current over- and undercurrent protection with independent settings for current and delay time
 Detection of diode failures by supervision of the ripple component of the excitation current
 Two stage supervision of the rotor insulation resistance with independent settings for resistance and time delay
 Two trip relays, one for excitation under- and over current, one for diode failure detection
 Digital inputs for blocking and for remote reset
 Programmable function of the blocking input
 Programmable assignment of protective functions to output relays
 Remote interfacing via RS485

APPLICATION

The MRR1 has 5 output relays. Relays 1 and 2 are provided with two change-over contacts each, the other relays with one change-over contact each.
Function of relays 1 – 4 is programmable. Status of self-supervision is indicated by relay 5. The relays are allocated to the following contacts :
Output relay 1: C1, D1, E1 and C2, D2, E2
Output relay 2: C3, D3, E3 and C4, D4, E4
Output relay 3: C5, D5, E5
Output relay 4: C6, D6, E6
Output relay 5: Self-supervision (internal fault of the relay) C7, D7, E7
All relays are normally off, only the self-supervision relay is normally on.

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