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Summary of Contents for Seg MRU3-2
- Page 1 MRU3-2 Voltage relay with evaluation of symmetrical components...
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Page 2: Table Of Contents
Adjustment of the slave address Output relays 5.4.7 Setting of Baud-rate (applies for Modbus- 8 Order form Protocol only) 5.4.8 Setting of parity (applies for Modbus- Protocol only) Parameter for the fault recorder 5.5.1 Adjustment of the fault recorder TB MRU3-2 12.00 E... -
Page 3: Introduction And Application
Introduction and application Features and characteristics • Microprocessor technology with watchdog, The MRU3-2 is a relay for voltage supervision with • digital filtering of the measured values by using dis- universal application, it protects the three-phase net- work against voltage unbalance or earthfaults in iso- crete Fourier analysis to suppress higher harmonics lated networks. -
Page 4: Design
Selbstüberwachung tU0> selfsupervision Serielle Schnittstelle Serial Interface Figure 3.2: Delta connection of the voltage transformers Attention ! If the input transformers are connected in delta circuit no detection of zero phase sequence (U ) is possible. TB MRU3-2 12.00 E... -
Page 5: Analog Input Circuits
• Relay 2; C3, D3, E3 and C4, D4, E4 and finally fed to the analog digital converter. De- • Relay 3; C5, D5, E5 pending upon the demands the MRU3-2 can be con- nected directly to the mains or via external voltage • Relay 4; C6, D6, E6 transformers in star- or delta connection. -
Page 6: Parameter Settings
Month M = 04 event. D = 18 Hour h = 07 Minute m = 59 Second s = 23 Additional functions Blocking function Relay configuration Fault memory TB MRU3-2 12.00 E... -
Page 7: Display
"Reset" key (refer to chapter 5.9.2) or suppressed by the FLASH/NO_FLASH func- tion. The active parameter set is indicated by LED "P2". LED D/Y lights up during parameter setting for the in- terlinking of the input voltage CTs. TB MRU3-2 12.00 E... -
Page 8: Working Principle
50 Hz. Sec. winding of Digital circuits mains V.T. The essential part of the MRU3-2 relay is a powerful microcontroller. All of the operations, from the analog )" digital conversion to the relay trip decision, are carried out by the microcontroller digitally. -
Page 9: Voltage Supervision
So an asymmetrical voltage vector system is formed. In a compensated or isolated grid a single-phase With the MRU3-2 the highest voltage is always evalu- earthfault will hardly cause a significant earth current. ated for overvoltage supervision and the lowest volt- Because, however, the faulty phase takes on the earth age for undervoltage supervision. -
Page 10: Measuring Principle
This reference star point is generally the earth poten- tial. The residual voltage in the zero sequence system is calculated as: U0 = | ( U TB MRU3-2 12.00 E... -
Page 11: Negative Sequence System Of A
Figure 4.3 shows a symmetrical vector system. As in- and adds them. Acc. to definition the result of the vec- dicated in the calculation the MRU3-2 forms the nega- tor must be multiplied by 1/3. In this example the sum equals zero. -
Page 12: Zero Sequence System
Usually this point is the earth potential. the MRU3-2 are wired in star connection. The star points must be earthed, furthermore the MRU2-2 must When an earthfault occurs in an isolated or compen- be set to Y-connection. -
Page 13: Operations And Settings
<ENTER> for about 3 s Delete failure memory wait <-> <SELECT/RESET> Enquiry failure memory FLT1; FLT2..<-><+> L1, L2, L3 U<, U<<, U>, U>> Trigger signal for the fault recorder TEST, P_UP, A_PI, TRIP <SELECT/RESET> <+><-> only Modbus TB MRU3-2 12.00 E... - Page 14 <TRIP> three times Inquire password PSW? <SELECT/RESET>/ <+>/<->/<ENTER> Relay tripped TRIP <TRIP> or fault tripping Secret password input XXXX <SELECT/RESET>/ <+>/<->/<ENTER> SEG System reset <SELECT/RESET> for about 3 s Table 5.1: Possible indication messages on the display TB MRU3-2 12.00 E...
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Page 15: Setting Procedure
** Sample rate is variably adjusted to the momentarily measured frequency. 16 samples are always measured in one period. *** Sample rate setting is fixed to 50 Hz or 60 Hz. 16 samples per 20 ms or 16.67 ms are always measured. TB MRU3-2 12.00 E... -
Page 16: Display Of The Activation Storage
B_S2 Parameter switch RESET input Note R_S2 Blocking input Parameter When the MRU3-2 is to be used for measuring the re- switch sidual voltage in systems with isolated or compensated B_FR Externe Trig- Reset input neutral or as generator earth fault protection, the gerung des Stör-... -
Page 17: Parameter Setting Of Over- And Under
5.5.1 Adjustment of the fault recorder overvoltage (U2>) The MRU3-2 is equipped with a fault recorder (refer to This parameter determines the treshold for the rms chapter 3.1.5). Three parameters can be determined. value of the negative sequence system. As described in 5.4.2, the entire stage can be blocked or set as... -
Page 18: Number Of The Fault Recordings
It is possible to adjust a time between 0.05s and the max. recording interval (2, 4 and 8s at 50 Hz and 1.33; 3.33 and 6.66 s at 60 Hz). With keys <+> and <-> the values can be changed and with <ENTER> be saved. TB MRU3-2 12.00 E... -
Page 19: Indication Of Measuring Values
Table 5.4: Units of the display 5.7.3 Indication in faultless condition In normal operation the display always shows |SEG. After pressing the pushbutton <SELECT/RESET> the display switches cyclically to the next value. After the measuring values had been indicated the setting pa- rameters are displayed. -
Page 20: Indication Of The Phase Sequence
Display "123" means that the connected rotating field has the positive sequence system of unit MRU3-2 and thus is considered as correct. If these voltages are ad- ditionally symmetrical, there will be no negative se- quence system and the positive sequence system has the same rms value as the phase voltages. -
Page 21: Fault Memory
When the relay is energized or is energized or trips, Recorded fault data: all fault data and times are stored in a non-volatile memory manner. The MRU3-2 is provided with a fault Measuring Displayed values Correspon- value recorder for max. five fault occurrences. In the... -
Page 22: Additional Functions
By pressing push button <SELECT/RESET> in blocking mode again, the assignment mode is selected. The blocking function of the MRU3-2 can be set ac- The relays are assigned as follows: LEDs U<, U<<, cording to requirement. By applying the aux. voltage U>, U>>, U1>, U1<, U2>... -
Page 23: Reset
Tripping _ _ 3 _ tU2> red U0> Alarm _ _ _ _ U0> green tU0> Tripping _ _ _ 4 tU0> red Table 5.4: Example of assignment matrix of the output relay (defaults settings) TB MRU3-2 12.00 E... -
Page 24: Relay Testing And Commissioning
As relay input energizing quantities, three phase volt- up red). An undervoltage condition has been detected ages should be applied to MRU3-2 relay input cir- after power-on, because no input voltages are applied cuits. Depending on the system conditions and the to the relay. -
Page 25: Secondary Injection Test
• Test leads and tools 6.4.1 Example of the test circuit For testing of the MRU3-2 relay, a three phase volt- age source is required. Figure 6.1 shows an example of a three-phase test circuit energizing the MRU3-2 re- lay during test. The three phase voltages are applied to the relay in Y-connection. -
Page 26: Checking The Input Circuits And Measuring Functions
For this test two phases must be reversed to the monics will be rejected by the internal DFFT-digital fil- MRU3-2. The third phase and the star point N are ter. Whereas the RMS-metering instrument measures connected as usual. The theoretical indicating values the RMS-value of the input signals. -
Page 27: Checking The Operating And Resetting Values Of The Over/Undervoltage
The star point N from the mains is not con- nected. Instead the star point of the MRU3-2 is con- Care must be taken that these terminals are also as- nected with phase L1. This type of connection simu- signed the blocking function (refer to chapter 5.9.1). -
Page 28: Primary Test
In actual service, for example, the measured voltage values on the MRU3-2 relay display may be com- pared phase by phase with the concerned indications of the instruments of the switchboard to verify that the relay works and measures correctly. -
Page 29: Technical Data
< U < 1.5 U , no influence Temperature influence: -20 °C ... 70 °C, < 1 % Auxiliary voltage influence: no influence within the admissible range GL-Approbation: 98776-96HH Bureau Veritas Approbation: 2650 6807 A00 H TB MRU3-2 12.00 E... -
Page 30: Setting Ranges And Steps
0.2; 0.5; 1.0; 2.0 s 7.3.1 Interface parameter Function Parameter Modbus-Protocol RS485 Open Data Protocol Slave-Adresse 1 - 32 1 - 32 Baud-Rate* 1200, 2400, 4800, 9600 9600 (fixed) Parity* even, odd, no „even Parity“ (fixed) * only Modbus Protocol TB MRU3-2 12.00 E... -
Page 31: Parameter For The Fault Recorder
Savings of the recording at the occurence P_UP; TRIP; A_PI; TEST Pre-trigger-time 0.05 s – 8.00 s * is written over when a new trigger signal arrives Output relays Trip relays/change-over contacts Alarm relaya/change-over contacts MRU3 TB MRU3-2 12.00 E... -
Page 32: Order Form
Rated voltage 100 V 230 V 400 V Housing (12TE) 19“- rack Flash mounting RS 485 Alternatively with Modbus protocol Technical data subject to change without notice! TB MRU3-2 12.00 E... - Page 33 Trip value for overvoltage in zero.phase sequence system 0.04 U0> Slave address of the serial interface RS** Baud-Rate 9600 RS** Parity-Check even * thresholds dependent on rated voltage 100 V / 230 V / 400 V **only Modbus TB MRU3-2 12.00 E...
- Page 34 U< alarm tripping U< U<< alarm tripping U<< U> alarm tripping U> U>> alarm tripping U>> U1< alarm tripping U1< alarm 1> tripping U1> alarm 2> tripping U2> alarm 0> tripping U0> TB MRU3-2 12.00 E...
- Page 35 Low/High-range for reset input Low/High-range for blockage input Default settings Actual settings Werkseinstellung Eigene Einstellung Low=plugged High=not plugged This technical manual is valid for For software-Version number: D06-7.01 (MRU3-1) D07-8.01 (MRU3-2) Modbus-version number: D56-1.01 (MRU3-1-M) D57-1.01 (MRU3-2-M) TB MRU3-2 12.00 E...
- Page 36 TB MRU3-2 12.00 E...
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