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Summary of Contents for Woodward MRR1
- Page 1 MRR1 – Multifunctional Generator Rotor Protection Relay Manual MRR1 (Revision A)
- Page 2 Woodward Manual MRR1 GB Woodward Governor Company reserves 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 Woodward Governor Company unless otherwise expressly undertaken.
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Page 3: Table Of Contents
Manual MRR1 GB Woodward Contents Introduction and application ............... 4 Features and characteristics ..............4 Design ......................5 Connections ........................5 3.1.1 Output relays ........................5 3.1.2 Blocking input ........................5 ... -
Page 4: Introduction And Application
Manual MRR1 GB 1. Introduction and application The generator rotor protection relay MRR1 com-bines rotor earth fault protection, excitation over- and undercurrent protection as well as rotating diode failure protection. Thus providing a powerful protection regarding the rotor of synchronous generators, covering the... -
Page 5: Design
Figure 3.1: Connection diagram 3.1.1 Output relays 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... -
Page 6: Display
Woodward Manual MRR1 GB Display Function Anzeige LED / colour Measuring Measuring value of the insulation resistance R green k values Measuring value of the excitation current green Ripple component of the excitation current green Setting val- Insulation resistance alarm element green k... -
Page 7: Leds
Manual MRR1 GB Woodward LEDs All LEDs (except LED RS) are two-colored. The LEDs on the left side, next to the alphanumerical display light up green during measuring and red after tripping. The 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. -
Page 8: Working Principle
MRR1 provides an alarm and a trip element for the rotor earth fault protection. The insulation resistance measurement system of the MRR1 can be used for synchronous genera- tors of both types, with and without brushes. - Page 9 Manual MRR1 GB Woodward Figure 4.2 explains the measuring principle: Figure 4.2: Measuring principle DOK-TD-MRR1 Rev.A...
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Page 10: Excitation Current Supervision
AVR response time (e.g. 2 s), to allow transient de-excitation of the genera- tor due to voltage regulator action. If required the MRR1 may be blocked by connecting supply voltage to terminals D8/E8. This might be necessary during start up of the generator. - Page 11 Manual MRR1 GB Woodward Diode failure protection: The diode failure protection is based on the measurement of the ripple component of the excitation current related to the mean value of the excitation current as per following formula: · 100 Typical values for Ir: ...
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Page 12: Operation And Settings
Woodward Manual MRR1 GB 5. Operation and settings Setting and measuring values By pressing push button <SELECT/RESET> al-ways the next value in sequence is displayed. At first measuring values are shown followed by the setting values. If the relay is in trip condition, dis- play of setting values can only be achieved after pressing push button <ENTER>. -
Page 13: Setting Procedure
Manual MRR1 GB Woodward Setting procedure Before changing a parameter a password has to be entered first (see chapter 4.4 of description "MR-digital multifunctional relay). The gradual changing procedure is clearly explained in the following table: Display Procedure Relevant push... -
Page 14: Reset
Woodward Manual MRR1 GB 5.2.3 Reset MRR1 has the following 3 possibilities to reset the display as well as the output relays at jumper position J3 = ON. (see also chapter 4.2 of description "MR-Digital Multifunctional Relays". Manual reset ... -
Page 15: Blocking Of Protective Functions And Assignment Of The Output Relays
Manual MRR1 GB Woodward Blocking of protective functions and assignment of the output relays By pressing the <ENTER> and <TRIP> push buttons simultaneously the menu for blocking of pro- tective functions and assignment of the output relays is activated. The assignments can either be done by using the push buttons on the front plate or via serial interface RS485. -
Page 16: Assignment Of The Output Relays
5.3.2 Assignment of the output relays Unit MRR1 has five output relays. The fifth output relay is provided as permanent normally on alarm relay for self supervision. Output relays 1 - 4 are normally off and can be assigned as alarm- or trip-ping relays to the different supervision functions which can either be done by using the push buttons on the front plate or via serial interface RS485. -
Page 17: Relay Testing And Commissioning
Manual MRR1 GB Woodward 6. Relay testing and commissioning The following test instructions should help to verify the protection relay performance before or dur- ing commissioning of the protection system. To avoid a relay damage and to ensure a correct relay operation, be sure that: ... -
Page 18: Example Of A Test Circuit
Example : For this test circuit the dc current is generated from a single-pulse rectification. If a cur- rent of IAV = 5A is fed to the MRR1, this value has to be indicated at the display. By repeatedly pressing the <SELECT/RESET> push button, measuring value Ir is displayed. -
Page 19: Checking The Pickup Value And Reset Value
(see chapter 5.3.2) trips. The value shown at the ammeter must not vary more than 2 % from the adjusted pickup value of the MRR1. The resetting value is ascertained by slowly de- creasing the test current until the output relay re-leases. Check that the resetting current is 0.98 times smaller than the operating current. -
Page 20: Technical Data
Woodward Manual MRR1 GB 7. Technical data Measuring input circuits Insulation resistance measuring: 24 V Measuring aux. voltage UH: Measuring frequency: = 0.51 Hz Measuring resistance range: 1 k to 1 M Max. input voltage: 600 V DC Exciter DC current measuring Max. -
Page 21: Setting Ranges And Steps
Manual MRR1 GB Woodward Setting ranges and steps Function Parameter Setting ranges Steps Tolerance < 5% of setting Pickup value of insu- 20...50: 1,0 20 k...200 k / lation resistance su- 50...100: 2,0 (EXIT) value pervision (warning) Tripping delay for R<... -
Page 22: Order Form
Woodward Manual MRR1 GB Order Form Rotor earth fault relay MRR1- Housing (12TE) 19“-rack Flush mounting Technical data subject to change without notice! DOK-TD-MRR1 Rev.A... - Page 23 Manual MRR1 GB Woodward Setting-list MRR1 Project: Woodward job.-no.: Function group: = Location: + Relay code: - Relay functions: Password: Default Actual Function Unit settings settings Pickup value of insulation resistance supervision (warning) 80.0 k Tripping delay for R< 1.00 R<...
- Page 24 Woodward Manual MRR1 GB Woodward Kempen GmbH Krefelder Weg 47 D – 47906 Kempen (Germany) 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.com...
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