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TB MRU3-1 12.00 E

17

6

Relay testing and
commissioning

The following test instructions should help to verify the
protection relay performance before or during commis-
sioning of the protection system. To avoid a relay
damage and to ensure a correct relay operation, be
sure that:

 

The auxiliary power supply rating corresponds to the
auxiliary voltage on site.

 

The rated frequency and rated voltage of the relay
correspond to the plant data on site.

 

The voltage transformer circuits are connected to the
relay correctly.

 

All signal circuits and output relay circuits are con-
nected correctly.

6.1

Power-On

NOTE!

Prior to switch on the auxiliary power supply, be sure
that the auxiliary supply voltage corresponds to the
rated data on the type plate.

Switch on the auxiliary power supply to the relay and
check that the message "ISEG" appears on the display
and the self supervision alarm relay (watchdog) is en-
ergized (Contact terminals D7 and E7 closed).
It may happen that the relay is tripped because of un-
der- voltage condition after power-on. (The message
"TRIP" on the display and LED L1, L2, L3 and U< light
up red). An undervoltage condition has been detected
after power-on, because no input voltages are applied
to the relay. In this case:

 

Press the push button <ENTER>, thus entering into
the setting mode. Now set the parameters U< and
U<< to "EXIT" to block the undervoltage functions. Af-
ter that, press the <SELECT/RESET> for app. 3 s to
reset the LEDs and "TRIP" message.

 

The undervoltage tripping after power on can also
be eliminated by applying three phase rated volt-
ages after power-on and reset the LED and "TRIP"
message.

 

Apply auxiliary voltage to the external blocking input
(Terminals E8/D8) to inhibit the undervoltage func-
tions (refer to 6.5) and press the <SELECT/RESET>
for app. 3 s to reset the LEDs and "TRIP" message.

(see chapter 5.9.1)

6.2

Testing the output relays

NOTE!

Prior to commencing this test, interrupt the trip circuit to
the circuit breaker if tripping is not desired.

By pressing the push button <TRIP> once, the display
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 soft-
ware version of the relay (e.g. „4.01“. The software
version should be quoted in all correspondence. Press-
ing the <TRIP> button once more, the display shows
"PSW?". Please enter the correct password to proceed
with the test. The message "TRI?" will follow. Confirm
this message by pressing the push button <TRIP>
again. All output relays should then be activated and
the self supervision alarm relay (watchdog) be deener-
gized one after another with a time interval of 1 sec-
ond. Thereafter, reset all output relays back to their
normal positions by pressing the push button
<SELECT/RESET>.

6.3

Checking the set values

By repeatedly pressing the push button <SELECT>, all
relay set values may be checked. Set value modifica-
tion can be done with the push button <+><-> and
<ENTER>. For detailed information about that, please
refer to chapter 4.3 of the description “MR – Digital
multifunctional relays”.
As relay input energizing quantities, three phase volt-
ages should be applied to 

MRU3

 relay input circuits.

Depending on the system conditions and the voltage
transformer used, three voltages can be connected to
the relay input circuits with either star or delta connec-
tion. In case of a star connection the phase-to-neutral
voltage will be applied to the voltage input circuits,
while the phase-to-phase voltages will be connected to
the voltage input circuits in case of a delta connection.
The voltage input connection must be set as a parame-
ter, and should correspond with the actual voltage in-
put connection:

Star connection:  Phase-to-neutral voltages will be

measured and evaluated.

Delta connection:  Phase-to-phase voltages will be

measured and evaluated.

NOTE!

For 

MRU3-1

 relay used for earth fault protection be

sure that the frequency set value (f=50/60) has been
selected correctly according to your system frequency
(50 or 60 Hz).
This also applies when using the disturbance recorder
(refer to Chapter 5.3.3).

Содержание MRU3-1

Страница 1: ...MRU3 1 AC voltage relay...

Страница 2: ...only 5 5 Parameter for the fault recorder 5 5 1 Adjustment of the fault recorder 5 5 2 Number of the fault recordings 5 5 3 Adjustment of trigger occurences 5 5 4 Pre trigger time Tpre 5 6 Date and t...

Страница 3: ...Features and characteristics Microprocessor technology with watchdog digital filtering of the measured values by using dis crete Fourier analysis to suppress higher harmonics and d c components induc...

Страница 4: ...asuring circuits are shown in the connection diagram The analog input voltages are galvanically decoupled by the input transformers of the device then filtered and finally fed to the analog digital co...

Страница 5: ...riting over If 2 4 or 8 recordings are chosen the complete memory is divided into the relevant number of partial segments If this max number of fault event has been exceeded the fault recorder block a...

Страница 6: ...rameters for the fault recorder FR Number of disturbance events FR Trigger events FR Pre trigger time Tvor Date and time Year Y 00 Month M 04 Day D 18 Hour h 07 Minute m 59 Second s 23 Additional func...

Страница 7: ...ting values for all parameters are stored in a parameter memory EEPROM Electrically Erasable Programmable Read Only Memory so that the actual relay settings cannot be lost even if the power supply is...

Страница 8: ...elta connection D 7 7 7 Sec winding of mains V T Figure 4 2 Input v t s in star connection Y 4 4 Blocking function No Dynamic Behaviour U U 1 voltage to external blocking input is ap plied free pro gr...

Страница 9: ...e time for each value U tU rated frequency setting value in Hz SELECT RESET fN U U 1 phase 3 phase U 1 U 3 SELECT RESET 1 3 Blocking function EXIT until max setting value until min setting value LED o...

Страница 10: ...an be correctly meas ured between 40 Hz and 70 Hz without adverse ef fects from the frequency With the setting f 50 60 Hz the measured voltage value is influenced by the frequency see Table 5 2 Declin...

Страница 11: ...d as parameter set change over switch With the setting R_S2 the reset input D8 E8 is used as pa rameter set change over switch With the setting B_FR the fault recorder is activated immediately by usin...

Страница 12: ...this ad justment the LED RS lights up 5 4 4 Setting of Baud rate applies for Modbus Protocol only Different transmission rates Baud rate can be set for data transmission via Modbus Protocol The rate...

Страница 13: ...failures min 6 minutes Note The window for parameter setting is located behind the measured value display The parameter window can be accessed via the SELECT RESET key 5 7 Indication of measuring valu...

Страница 14: ...the latest fault data set recorded At the same time the pa rameter set active at the occurence is shown By pressing SELECT RESET the fault measuring values can be scrolled By pressing it can be scroll...

Страница 15: ...LECT RESET in blocking mode again the assignment mode is selected The relays are assigned as follows LEDs U U U and U are two coloured and light up green when the output relays are assigned as alarm r...

Страница 16: ...be reset when the pickup is not present anymore otherwise TRIP remains in display During resetting of the display the parameters are not affected 5 9 3 Erasure of fault storage To delete the trip stor...

Страница 17: ...circuit breaker if tripping is not desired By pressing the push button TRIP once the display shows the first part of the software version of the relay e g D08 By pressing the push button TRIP twice t...

Страница 18: ...gu lation Voltage adjustable from 0 to 2 x UN Timer to measure the operating time Accuracy class 10 ms Switching device Test leads and tools 6 4 2 Example of the test circuit For testing of the MRU3 1...

Страница 19: ...n must not exceed 1 of the set operating value Furthermore gradually decrease increase the volt ages until the relay resets i e the voltage alarm output relay is disengaged Check that the dropout to p...

Страница 20: ...he relay works and measures correctly 6 6 Maintenance Maintenance testing is generally done on site at regu lar intervals These intervals vary among users depend ing on many factors e g the type of pr...

Страница 21: ...ime lag error class index E 10 ms Minimum operating time 30 ms Max allowed interruption of the auxiliarxy supply without effecting the function of the device 50 ms Influences on voltage measuring Aux...

Страница 22: ...0 V 2 200 V EXIT UN 230 V 2 460 V EXIT UN 400 V 4 800 V EXIT 0 04 50 s EXIT 1 V 1 V 2 V 0 01 0 02 0 05 0 1 0 2 0 5 1 0 2 0 s 1 of set value or 0 3 UN 1 or 15 ms 7 3 1 Interface parameter Function Para...

Страница 23: ...asuring of the positive phase sequence negative phase sequence and zero phase sequence system component 1 2 Rated voltage 100 V 230 V 400 V 1 2 4 Housing 12TE 19 rack Flash mounting A D RS 485 Alterna...

Страница 24: ...ernal triggering for the fault recorder SET1 Protection parameter Function Unit Default settings Set 1 Set 2 Actual settings Set 1 Set 2 1 3 1 phase 3 phase tripping U 1 U Pickup value for undervoltag...

Страница 25: ...the minute minute m 00 Clock Setting of the second second s 00 Blocking function Default settings Actual settings Blocking Not blocking Blocking Not blocking Parameter set Set 1 Set 2 Set 1 Set 2 Set...

Страница 26: ...Plugged Not plugged X No function X Code jumper Low High range for reset input Low High range for blockage input Default settings Actual settings Default settings Actual settings Low plugged X X High...

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