Related Manuals for Seg HighTECH MRR1
Summary of Contents for Seg HighTECH MRR1
- Page 1 MANUAL HighTECH Line PROTECTION TECHNOLOGY MADE SIMPLE MRR1 MULTIFUNCTIONAL GENERATOR ROTOR PROTECTION RELAY MULTIFUNCTIONAL GENERATOR ROTOR PROTECTION RELAY Original document English Revision: B...
- Page 2 SEG Electronics GmbH Manual MRR1 SEG Electronics reserves the right to update any portion of this publication at any time. Information provided by SEG Electronics is believed to be correct and reliable. However, no responsibility is assumed by SEG Electronics unless otherwise expressly undertaken.
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Page 3: Table Of Contents
Manual MRR1 SEG Electronics GmbH 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 3.1.3 External reset input ......................5 Display ..........................6 LEDs ............................ -
Page 4: Introduction And Application
SEG Electronics GmbH Manual MRR1 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
Manual MRR1 SEG Electronics GmbH 3. Design Connections 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. -
Page 6: Display
SEG Electronics GmbH Manual MRR1 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 SEG Electronics GmbH 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
SEG Electronics GmbH Manual MRR1 4. Working principle Rotor earth fault protection A single earth fault on the field windings of a synchronous generator produces no immediate dam- aging effect. It must be detected and removed be-cause of the possibility of a second earth fault that could short a part of the field winding and cause severe damage. - Page 9 Manual MRR1 SEG Electronics GmbH Figure 4.2 explains the measuring principle: Figure 4.2: Measuring principle DOK-TD-MRR1, Rev. B...
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Page 10: Excitation Current Supervision
SEG Electronics GmbH Manual MRR1 Excitation current supervision Failures in the excitation system of a synchronous generator may cause severe damage to the ro- tor of the generator as well as undesirable operating conditions: Failure Effect AVR failure; undercurrent Excessive reactive current flow to the generator ... - Page 11 Manual MRR1 SEG Electronics GmbH 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: �� − ��...
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Page 12: Operation And Settings
SEG Electronics GmbH Manual MRR1 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 SEG Electronics GmbH 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
SEG Electronics GmbH Manual MRR1 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 SEG Electronics GmbH 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
SEG Electronics GmbH Manual MRR1 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 SEG Electronics GmbH 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
SEG Electronics GmbH Manual MRR1 6.4.2 Example of a test circuit Figure 6.1 shows a simple example of a test circuit with variable current source for testing the re- lay. Figure 6.1: Test circuit 6.4.3 Checking the insulation measuring circuit For checking the insulation measuring circuit a resistor with a defined value is simply connected to terminals A2 - A3/A4 (A3 and A4 are to be bridged). -
Page 19: Checking The Pickup Value And Reset Value
Manual MRR1 SEG Electronics GmbH 6.4.5 Checking the pickup value and reset value For testing these values a current smaller than the adjusted pickup value has to be injected (termi- nals B1 - B2). The current is now to be increased until the relay picks up, which is indicated by lighting up of LEDs le and le>. -
Page 20: Technical Data
SEG Electronics GmbH Manual MRR1 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 SEG Electronics GmbH 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) 3% or +0...2.2 s Tripping delay for R<... -
Page 22: Order Form
SEG Electronics GmbH Manual MRR1 Order Form Rotor earth fault relay MRR1- Housing (12TE) 19“-rack Flush mounting Technical data subject to change without notice! DOK-TD-MRR1, Rev. B... - Page 23 Manual MRR1 SEG Electronics GmbH Setting-list MRR1 Project: 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 SEG Electronics GmbH reserves the right to update any portion of this publication at any time. Information provided by SEG Electronics GmbH is believed to be correct and reliable. However, SEG Electronics GmbH assumes no responsibility unless otherwise expressly undertaken.
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