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MRR1 – Multifunctional Generator Rotor

Protection Relay

Manual MRR1 (Revision A)

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Summary of Contents for MRR1

Page 1: ...MRR1 Multifunctional Generator Rotor Protection Relay Manual MRR1 Revision A...

Page 2: ...the right to update any portion of this publication at any time Information provided by Woodward Governor Company is believed to be correct and reliable However no responsibility is as sumed by Woodw...

Page 3: ...tive functions and assignment of the output relays 15 5 3 1 Blocking of protective functions 15 5 3 2 Assignment of the output relays 16 6 Relay testing and commissioning 17 6 1 Power On 17 6 2 Testin...

Page 4: ...ver current and ripple detection for diode failure protection 2 Features and characteristics Besides features described in the general MR description MRR1 provides Detection of high impedance earth fa...

Page 5: ...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 S...

Page 6: ...Tripping time for insulation resistance trip element s tR red Setting for excitation undercurrent element A Ie green Delay time setting for excitation undercurrent element s tIe red Setting for excita...

Page 7: ...e LEDs beyond the push button SELECT RESET are lit green during setting and inquiry pro cedure of the setting values which are printed on the left side next to the LEDs The LEDs will light up red afte...

Page 8: ...or earth ref to connection diagram The low frequency of the test voltage is used to avoid malfunction due to the field to earth capacitance CE which can reach values up to 1 F on large generators The...

Page 9: ...Manual MRR1 GB Woodward DOK TD MRR1 Rev A 9 Figure 4 2 explains the measuring principle Figure 4 2 Measuring principle...

Page 10: ...system Table 4 1 Effects of different failures Excitation current supervision The excitation current supervision comprises of three elements under and over current and ripple component measurement Th...

Page 11: ...ula 100 Typical values for Ir All diodes all right Ir 15 20 One diode open Ir 110 One diode short Ir 200 The setting of Ir should be chosen at about 40 to 50 The tripping time tIr should be instanta n...

Page 12: ...the display WW appears again Measuring value LED R Insulation resistance green Ie Exciter current green Ir Ripple component of the exciter current green Table 5 1 Measuring values Setting values LED...

Page 13: ...the pickup value and tripping de lay can be adjusted When the set pickup value is either exceeded or falls below the corresponding LED flashes After elaps of the tripping delay trip of the relay is in...

Page 14: ...button SELECT RESET for some time approx 3 seconds Electrical reset by applying aux voltage to C8 D8 Software reset software reset has the same effect as the SELECT RESET push button Please also refer...

Page 15: ...de failure protection By repeatedly pressing the SELECT RESET push button the functions to be blocked are selected one after another The corresponding LED lights up simultaneously The display shows BL...

Page 16: ...element When the display shows _ _ _ _ no alarm relay is assigned to this element The assignment of output relays 1 4 can be changed by pressing and push buttons The selected assignment can be stored...

Page 17: ...shows the first part of the software version of the relay e g D08 By pressing the push button TRIP twice the display shows the second part of the software version of the relay e g 4 01 The software ve...

Page 18: ...t circuit For checking the measuring values a current must be injected terminals B1 B2 which is below the set pickup current of the MRR1 After renewed pressing the SELECT RESET push button measuring v...

Page 19: ...ources above described Since the cost and potential hazards are very high for such a test especially if staged fault tests are in tended these tests are usually limited to very important protective re...

Page 20: ...nuous current 20 A DC Nominal current IN 10 A DC measuring range up to 25A DC Power consumption in current circuit 1 VA 7 2 Common data Dropout to pickup ratio 98 Returning time 30ms Minimum operating...

Page 21: ...value Tripping delay for R tR 1 50 sec EXIT 0 1 0 2 0 5 1 0 3 or 0 2 2 s Pickup value of ex citer undercurrent element Ie EXIT 0 2 20 A 0 05 0 1 0 2 0 5 2 of setting value or 0 01A Tripping delay for...

Page 22: ...Woodward Manual MRR1 GB 22 DOK TD MRR1 Rev A 7 5 Order Form Rotor earth fault relay MRR1 Housing 12TE 19 rack Flush mounting A D Technical data subject to change without notice...

Page 23: ...ercurrent element A 0 50 tIe Tripping delay for I s 0 10 Ie Pickup value exciter over current element A 5 00 tIe Tripping delay for I s 0 1 Ir Pickup value for ripple voltage supervision 50 tIr Trippi...

Page 24: ...ermany Postfach 10 07 55 P O Box D 47884 Kempen Germany Phone 49 0 21 52 145 1 Internet www woodward com Sales Phone 49 0 21 52 145 216 or 342 Telefax 49 0 21 52 145 354 e mail salesEMEA_PGD woodward...

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