Woodward XRI1-IR User manual

XRI1-IR –Digital multifunctional relay for
time overcurrent protection
Manual XRI1-IR (Revision C)

Woodward Manual XRI1-IR
2 DOK-TD-XRI1-IR, Rev. C
Woodward reserves the right to update any portion of this publication at any time.
Information provided by Woodward is believed to be correct and reliable.
However, no responsibility is assumed by Woodward unless otherwise expressly undertaken.
© Woodward 1994–2019

Manual XRI1-IR Woodward
DOK-TD-XRI1-IR, Rev. C 3
Contents
1. Introduction and application........................................................................................5
2. Features and characteristics .......................................................................................6
3. Design............................................................................................................................7
3.1 Connections.............................................................................................................................................7
3.1.1 Analog input circuits.............................................................................................................................7
3.1.2 Blocking input.......................................................................................................................................7
3.1.3 External reset input..............................................................................................................................7
3.1.4 Output relays (default settings)............................................................................................................8
3.1.5 Data communication............................................................................................................................9
3.2 Front plate..............................................................................................................................................10
3.2.1 Indication and operation elements.....................................................................................................10
3.2.2 Display...............................................................................................................................................11
3.2.3 LEDs..................................................................................................................................................12
3.2.4 Parameter settings (see chapter 6) ...................................................................................................12
4. Working principle........................................................................................................13
4.1 Analog circuits .......................................................................................................................................13
4.2 Digital circuits.........................................................................................................................................13
4.3 Directional feature..................................................................................................................................14
4.4 Requirements on the main current transformers...................................................................................15
5. General operations and settings...............................................................................16
5.1 Push buttons..........................................................................................................................................16
5.1.1 Indication of measuring values and fault data ...................................................................................17
5.2 Dip switches...........................................................................................................................................18
5.2.1 Function of the output relays .............................................................................................................18
5.3 Reset......................................................................................................................................................19
5.4 Password...............................................................................................................................................19
5.4.1 Password programming.....................................................................................................................19
5.4.2 Using the password ...........................................................................................................................19
5.5 Relay setting principle............................................................................................................................20
5.5.1 Setting of default parameters.............................................................................................................20
5.5.2 Blocking the protection function.........................................................................................................20
5.6 Display of software version and test-TRIP ............................................................................................21
5.7 Low/high range of functions blocking and reset ....................................................................................21
6. Operations and settings.............................................................................................22
6.1 Setting procedure ..................................................................................................................................22
6.1.1 Pickup current for phase overcurrent element (I>)............................................................................22
6.1.2 Time current characteristics for phase overcurrent element (CHAR I>) ...........................................22
6.1.3 Trip delay or time multiplier for phase overcurrent element (tI>).......................................................22
6.1.4 Reset setting for inverse time tripping characteristics in the phase current path..............................23
6.1.5 Current setting for high set element (I>>)..........................................................................................23
6.1.6 Trip delay for high set element (tI>>).................................................................................................23
6.1.7 Relay characteristic angle RCA.........................................................................................................24
6.1.8 Nominal frequency.............................................................................................................................24
6.1.9 Adjustment of the slave address........................................................................................................24
6.1.10 Circuit breaker failure protection tCBFP ...........................................................................................24
6.1.11 Display of the activation storage (FLSH/NOFL) ............................................................................24
6.1.12 Blocking the protection functions and assignment of the output relays ........................................25
6.2 Setting value calculation........................................................................................................................26
6.2.1 Definite time overcurrent element......................................................................................................26
6.2.2 Inverse time overcurrent element......................................................................................................27
6.3 Indication of measuring and fault values ...............................................................................................27
6.3.1 Measuring values...............................................................................................................................27
6.3.2 Indication of fault data........................................................................................................................27
6.3.3 Fault recorder.....................................................................................................................................28
6.4 Reset......................................................................................................................................................29

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4 DOK-TD-XRI1-IR, Rev. C
7. Relay testing and commissioning.............................................................................30
7.1 Power-On...............................................................................................................................................30
7.2 Testing the output relays and LEDs ......................................................................................................30
7.3 Checking the set values.........................................................................................................................30
7.4 Secondary injection test.........................................................................................................................31
7.4.1 Test equipment..................................................................................................................................31
7.4.2 Test circuit of XRI1-IR........................................................................................................................31
7.4.3 Checking the input circuits and measured values.............................................................................33
7.4.4 Checking the operating and resetting values of the relay .................................................................33
7.4.5 Checking the relay operating time.....................................................................................................33
7.4.6 Checking the high set element of the relay .......................................................................................33
7.4.7 Checking the external blocking and reset functions..........................................................................34
7.4.8 Test of the CB failure protection........................................................................................................34
7.5 Primary injection test .............................................................................................................................35
7.6 Maintenance ..........................................................................................................................................35
8. Technical data.............................................................................................................36
8.1 Measuring input circuits.........................................................................................................................36
8.2 Common data ........................................................................................................................................36
8.3 Setting ranges and steps.......................................................................................................................37
8.3.1 Time overcurrent protection...............................................................................................................37
8.3.2 Switch failure protection.....................................................................................................................37
8.3.3 Interface parameter ...........................................................................................................................37
8.3.4 Inverse time overcurrent protection relay..........................................................................................37
8.3.5 Direction unit for phase overcurrent relay..........................................................................................38
8.4 Inverse time characteristics...................................................................................................................39
8.5 Output relays .........................................................................................................................................41
8.6 Power supply .........................................................................................................................................41
8.7 Inputs, Blockage and Reset...................................................................................................................41
8.8 System data and test specifications ......................................................................................................42
8.9 Relay case.............................................................................................................................................43
9. Order form...................................................................................................................44

Manual XRI1-IR Woodward
DOK-TD-XRI1-IR, Rev. C 5
1.Introduction and application
The digital relay type XRI1-IR as time overcurrent protection has been designed for the use in electrical ma-
chines, lines and grids.
The protective functions of XRI1-IR that are implemented in only one device are summarized as follows:
Independent (Definite) time overcurrent relay.
Inverse time overcurrent relay with selectable characteristics.
Integrated determination of fault direction for application to doubly infeeded lines or
meshed systems.
Furthermore, the relay XRI1-IR can be employed as a back-up protection for distance and differential protective
relays.

Woodward Manual XRI1-IR
6 DOK-TD-XRI1-IR, Rev. C
2.Features and characteristics
Digital filtering of the measured values by using discrete Fourier analysis to suppress the
high frequency harmonics and DC components induced by faults or system operations
Selectable protective functions between:
- definite time overcurrent relay and
- inverse time overcurrent relay
Selectable inverse time characteristics according to BS 142 and IEC 255-4:
- Normal Inverse (type A)
- Very Inverse (type B)
- Extremely Inverse (type C)
Reset setting for inverse time characteristics selectable
High set overcurrent unit with instantaneous or de-finite time function.
Two-element (low and high set) overcurrent relay both for phase and earth faults.
Directional feature for application to the doubly in-feeded lines or meshed systems.
Numerical display of setting values, actual measured values and their active, reactive
components, memorized fault data, etc.
Blocking e.g. of high set element (e.g. for selective fault detection through minor
overcurrent protection units after unsuccessful AR).
Relay characteristic angle for phase current directional feature selectable
Switch failure protection
Storage of tripping values and shut-down times of eight failure events
Free assignment of output relays
Serial data exchange via RS485 interface possible with Woodward RS485-Pro Open Data
Protocol
Suppression of indication after an activation (LED flash)

Manual XRI1-IR Woodward
DOK-TD-XRI1-IR, Rev. C 7
3.Design
3.1 Connections
Figure 3.1: Connection diagram XRI1-IR
3.1.1 Analog input circuits
The protection unit receives the analog input signals of the phase currents IL1 (1S1-1S2), IL2 (2S1-2S2), IL3
(3S1-3S2), phase voltages U1 (L1-N1), U2 (L2-N2), U3 (L3-N3) each via separate input transformers. The N1,
N2 and N3 are bridged externally. The constantly detected current measuring values are galvanically decou-
pled, filtered and finally fed to the analog/digital converter.
3.1.2 Blocking input
The blocking functions adjusted before will be blocked if an auxiliary voltage is connected to (terminals) C1/C1L
or C1/C1H. (See chapter 6.2.12)
3.1.3 External reset input
By applying the aux. voltage C2/C2L or C2/C2H, indication and output relays are reset. (see chapter 6.4)

Woodward Manual XRI1-IR
8 DOK-TD-XRI1-IR, Rev. C
3.1.4 Output relays (default settings)
The XRI1-IR is equipped with 5 output relays. Apart from the relay for self-supervision, one relay with 2 change-
over contacts for signaling, all protective functions can be optionally assigned:
Output relays 1;
11, 12, 14 and 21, 22, 24
Signal overcurrent (I>);
31, 32, 34 und 41, 42, 44
Signal „Short Circuit Tripping“ (I>>)
51, 52, 54
Aux. Relays
61, 62, 64
Signal self-supervision
71, 72, 74
All trip and alarm relays are working current relays, the relay for self supervision is an idle current relay.
See connection diagram relay outputs.
Except the self-supervision, all relays can be assigned to different functions. (see 6.1.12).

Manual XRI1-IR Woodward
DOK-TD-XRI1-IR, Rev. C 9
3.1.5 Data communication
For data communication with a central control system the XRI1-IR relay is provided with a serial interface
RS485. Simplified and fast reading and changing of parameters and measuring values can be achieved by
HTL/PL-Soft3, which will be provided on request together with the relay.
The XRI1-IR can be connected to other units of
PROFESSIONAL LINE via interface. If there is more than 1 relay in the system, the last relay of the chain has to
be provided with a resistor line termination.
Figure 3.2: Connection example with 3 users XR ... as linked device
Figure 3.3: Connection example with 3 users, XR ... as last device

Woodward Manual XRI1-IR
10 DOK-TD-XRI1-IR, Rev. C
3.2 Front plate
3.2.1 Indication and operation elements
The front plate of protection relays comprises the following operation and indication elements:
Alphanumerical display (4 Digits)
Push buttons for setting and other operations
LEDs for measured value indication and setting
Figure 3.4: Front plate XRI1-IR

Manual XRI1-IR Woodward
DOK-TD-XRI1-IR, Rev. C 11
3.2.2 Display
Function
Display shows
Pressed push button
Corresponding
LED
Normal operation
WW
Measured operating values
Actual measured
values,
<SELECT/RESET>
one time for each
L1, L2, L3 IP/IQwith
regard to directional
feature
Measuring range overflow
max.
<SELECT/RESET>
L1, L2, L3
Setting values: phase (I>; CHAR
I>; tI>; I>>; tI>>)
Current settings
Trip delay Charac-
teristics
<SELECT/RESET> one
time for each parameter
I >; CHAR I>; tI>;
I>>; tI>>; LED →←
Reset setting (only available at
inverse time characteristics)
0s / 60s
<SELECT/RESET><+><->
I>; CHAR I>; tI>
Relay characteristic angle for
phase current directional feature
RCA in degree (°)
<SELECT/RESET><+><->
LED →← (green)
Warning reverse direction
no warning
warning
NOWA WBAK
<SELECT/RESET><+><->
LED →← (red) + I>
Switch failure protection
tCBFP
<SELECT/RESET><+><->
Tripping protection switch failure
protection
CBFP
After fault tripping
Nominal frequency
f=50 / f=60
<SELECT/RESET><+><->
Switch-over LED flash No
LED flash
FLSH NOFL
<SELECT/RESET><+><->
Blocking of function
EXIT
<+> until max. setting
value
LED of blocked pa-
rameter
Slave address of serial interface
1 - 32
<SELECT/RESET><+><->
RS
Recorded fault data
Tripping currents
and other fault da-
ta
<SELECT/RESET>
one time for each phase
L1, L2, L3, E I>, I>>,
IE>, IE>>, UE>
Save parameter?
SAV?
<ENTER>
Delete failure memory
wait
<-><SELECT/RESET>
Enquiry failure memory
FLT1; FLT2.....
<-><+>
L1, L2, L3, E I>, I>>,
IE>, IE>>,
Save parameter!
SAV!
<ENTER> for about 3 s
Software version
First part (e.g.
D01-) Sec. part
(e.g. 8.00)
<TRIP>
one time for each part
Manual trip
TRI?
<TRIP> three times
Inquire password
PSW?
<TRIP><ENTER>
Relay tripped
TRIP
<TRIP> or after fault trip-
ping
Secret password input
XXXX
<SELECT/RESET><+><->
<ENTER>
System reset
WW
<SELECT/RESET>
for about 3 s
Table 3.1: Possible indication messages on the display

Woodward Manual XRI1-IR
12 DOK-TD-XRI1-IR, Rev. C
3.2.3 LEDs
The LEDs left from the display, L1, L2, L3, are partially bi-colored, the green indicating measuring, and the red
fault indication.
XRI1-IR with directional feature have a LED (green- and red arrow) for the directional display. At pickup/trip and
parameter setting the green LED lights up to indicate the forward direction, the red LED indicates the reverse di-
rection.
The LED marked with letters RS lights up during setting of the slave address of the device for serial data com-
munication.
The LEDs arranged at the characteristic points on the setting curves support the comfortable setting menu se-
lection. In accordance with the display 5 LEDs for phase fault overcurrent indicate the corresponding menu point
selected.
3.2.4 Parameter settings (see chapter 6)
Relay-type XRI1-IR
I>
CHAR I>
tI>
0s/60s 1)
I>>
tI>>
RCA
tCBFP
50/60 Hz
LED-Flash
RS485/Slave address
Table 3.2: Parameter values
1) Reset setting for inverse time characteristics in phase current path
Additional parameters:
Relay-type XRI1-IR
Blocking mode
Relay parameterizing
Fault recorder
Table 3.3

Manual XRI1-IR Woodward
DOK-TD-XRI1-IR, Rev. C 13
4.Working principle
4.1 Analog circuits
The incoming currents from the main current transformers on the protected object are converted to voltage sig-
nals in proportion to the currents via the input transformers and burden. The noise signals caused by inductive
and capacitive coupling are suppressed by an analog R-C filter circuit.
The analog voltage signals are fed to the A/D-converter of the microprocessor and transformed to digital signals
through Sample- and Hold-circuits. The analog signals are sampled at 50 Hz (60 Hz) with a sampling frequency
of 800 Hz (960 Hz), namely, a sampling rate of 1.25 ms (1.04 ms) for every measuring quantity. (16 scans per
period).
4.2 Digital circuits
The essential part of the XRI1-IR 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. The relay program is located
in an EPROM (Electrically-Programmable-Read-Only-Memory). With this program the CPU of the microcontrol-
ler calculates the three phase currents and ground current in order to detect a possible fault situation in the pro-
tected object.
For the calculation of the current value an efficient digital filter based on the Fourier Transformation (DFFT -
Discrete Fast Fourier Transformation) is applied to sup-press high frequency harmonics and DC components
caused by fault-induced transients or other system disturbances.
The calculated actual current values are compared with the relay settings. If a phase current exceeds the pickup
value, an alarm is given and after the set trip delay has elapsed, the corresponding trip relay is activated.
The relay setting 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
interrupted.
The microprocessor is supervised by a built-in "watch-dog" timer. In case of a failure the watchdog timer re-sets
the microprocessor and gives an alarm signal, via the output relay "self supervision".

Woodward Manual XRI1-IR
14 DOK-TD-XRI1-IR, Rev. C
4.3 Directional feature
A built-in directional element in XRI1-IR is available for application to doubly infeeded lines or to ring networks.
The measuring principle for determining the direction is based on phase angle measurement and therefore also
on coincidence time measurement between current and voltage. Since the necessary phase voltage for deter-
mining the direction is frequently not available in the event of a fault, whichever line-to-line voltage follows the
faulty phase by 90° is used as the reference voltage for the phase current. The characteristic angle at which the
greatest measuring sensitivity is achieved can be set to precede the reference voltage in the range from 15° to
83°.
Figure 4.1: Relay characteristic angle
The TRIP region of the directional element is determined by rotating the phasor on the maximum sensitivity an-
gle for ±90°, so that a reliable direction decision can be achieved in all faulty cases.
Figure 4.2: TRIP/NO-TRIP region for directional element in XRI1-IR. In this case the advance direction is defined as
TRIP region and the reverse direction as NO-TRIP region.
By means of accurate hardware design and by using an efficient directional algorithm a high sensitivity for the
voltage sensing circuit and a high accuracy for phase angle measurement are achieved so that a correct direc-
tional decision can be made even by close three-phase faults.
As an addition, to avoid mal-operations due to disturbances, at least 2 periods (40 ms at 50 Hz) are evaluated.

Manual XRI1-IR Woodward
DOK-TD-XRI1-IR, Rev. C 15
For the MRI1-overcurrent relays with directional feature different time delays or time multipliers can be set for
forward and backward faults (ref. to chapter 6.1.3 and 6.1.6).
If the trip delay for backward faults is set longer than the one for forward faults, the protective relay works as a
"backup"-relay for the other lines on the same busbar. This means that the relay can clear a fault in the back-
ward direction with a longer time delay in case of refusal of the relay or the circuit breaker on the faulted line.
If the trip delay for backward faults is set out of range (on the display "EXIT"), the relay will not trip in case of
backward faults.
4.4 Requirements on the main current transformers
The current transformers have to be rated in such a way, that a saturation should not occur within the fol-lowing
operating current ranges:
Independent time overcurrent function: K1 = 2
Inverse time overcurrent function: K1 = 20
High-set function: K1 = 1.2 - 1.5
K1 = Current factor related to set value, at which the C.T. is not yet saturated
Moreover, the current transformers have to be rated according to the maximum expected short circuit current in
the network or in the protected objects.
The low power consumption in the current circuit of XRI1-IR, namely <0.2 VA, has a positive effect on the selec-
tion of current transformers. It implies that, if an electromechanical relay is replaced by XRI1-IR, a high accuracy
limit factor is automatically obtained by using the same current transformer.

Woodward Manual XRI1-IR
16 DOK-TD-XRI1-IR, Rev. C
5.General operations and settings
For adjustment of the unit the transparent cover has to be opened as illustrated. Do not use force! The trans-
parent cover has two inserts for labels.
Figure 5.1: How to open the transparent cover
5.1 Push buttons
Push buttons are used for calling up the parameters to be processed, for selection of measuring parameters to
be indicated and for changing and storing the parameters.
The individual setting and measuring values can be selected one after another by pressing push button
<SELECT/RESET>. This push button is also used for re-setting the display by pressing approx. 3s.
As for an individual case (relay version D) the push button can also be operated when the front cover of the re-
lay is closed and sealed with lead.
Push buttons <+> <-> are used for in-/decrementing of the parameter indicated on the display. They can be
pressed step-by-step or continuously.
After the selected parameter is set by the <+> <-> push button it may be stored using the <ENTER> push but-
ton.
Through the push button <ENTER> the set value indicated on the display will be transferred to the internal pa-
rameter memory. An unintented or unauthorized change of the selected parameter is avoided by means of a
password identification (see 5.4.2).
The <TRIP>-push button is used to test the output relay circuits both for tripping and signalling. During normal
operation it is also interlocked by means of the pass-word identification.

Manual XRI1-IR Woodward
DOK-TD-XRI1-IR, Rev. C 17
5.1.1 Indication of measuring values and fault data
Indication in faultless condition
In normal operation the display always shows |WW. After pressing the push button <SELECT/RESET> the dis-
play switches cyclically to the next measuring value. After the measuring values had been indicated the set-ting
parameters are displayed. Hereby the LEDs in the upper section signalize which measured value is indicated,
the LEDs in the lower section signalize which setting parameter is indicated on the display. Longer actuating the
push button resets the relay and the display changes into normal operation (|WW).
Indication after pickup/tripping
All of the faults detected by the relay are indicated on the front plate optically. Here not only the faults are indi-
cated but also the faulty phase(s) and the protection function in operation. At pickup the LEDs are flashing, after
tripping this changes to continuous light.
In tripped condition "TRIP" appears on the display and the LEDs of the operating measuring data light up red
together with the LEDs of the tripping parameter. All operating data, which were measured at the moment of
tripping, can now be called one after another by pressing push button <SELECT/RESET>. If in this condition
setting parameters are to be indicated, push but-ton <ENTER> has to be pressed.
The graphic below shows again the difference between the different display modes.
Figure 5.2: Switching over of the display in dependence of the operating mode

Woodward Manual XRI1-IR
18 DOK-TD-XRI1-IR, Rev. C
5.2 Dip switches
Behind the front plate of the XRI-IR relay there is one dip switch to preset the following functions:
Password programming
Output relay functions
The following table 5.1 shows the position and designation of the code jumpers:
5.2.1 Function of the output relays
The alarm relays are activated according to the preset-ting:
Dip switch 3 OFF:
All output relays will be reset automatically after the fault has been cleared, (e.g. when the fault current is inter-
rupted).
Dip switch 3 ON:
All output relays remains activated and must be reset after fault clearance.
Manually: By pressing push button <SELECT/RESET>
External: By connecting aux. voltage to C2/C2L or C2/C2H
Via RS 485 interface
To let the parameter change take effect, the auxiliary voltage has to be switched on and off again after the dip
switches are plugged or unplugged.
Dip switches
Function
Code jumper
position
Operation mode
1
Password
OFF
Normal position
ON
Password selection
2
none
3
Reset
OFF
Output relays will be reset automatically
ON
Output relays will be reset manu-
al/external/via software
4
none
Table 5.1: Summary of coding possibilities

Manual XRI1-IR Woodward
DOK-TD-XRI1-IR, Rev. C 19
5.3 Reset
Manual reset
By pressing push button <RESET/SELECT> for some time (about 3 s).
External reset-input C2/C2L or C2/C2H
The external reset input has the same function as the <SELECT/RESET> push button on the front plate. Con-
necting auxiliary voltage to this input, the unit can be reset, provided that the fault is removed.
Software reset via serial interface RS 485
Software reset has the same function as push button <SELECT/RESET>. Please refer to open data protocol of
RS 485 interface named RS485-PRO.
5.4 Password
5.4.1 Password programming
The XRI1-IR-relay is delivered with the preset password "++++", it can be programmed new with dip switch 1:
Switch on dip switch 1. After power on and pressing any push button, the relay XRI1-IR inquires for a new
password. The text "PSW?" appears on the display. The new password is entered by any combination of the
push buttons <SELECT> <-> <+> <ENTER>. After the new password is given, the dip switch 1 must be
switched off.
5.4.2 Using the password
Step by step, a new relay setting is made according to the following sequence:
After the present setting value is changed with <+><-> push button, <ENTER> push button
should be pressed.
A message "SAV?" appears on the display to inquire if the new setting value is really
wanted to be stored.
After pressing the <ENTER> push button again, the password will be inquired by means of
the message "PSW?" on the display.
After the password is given correctly, which is prompted by message "SAV!" on the display,
the new setting value can be stored by pressing the <ENTER> push button for about
3 seconds.
The new setting value for the selected parameter appears on the display again.
A password consists of four push button operations. The pressed push buttons and their sequences define the
password.
<SELECT/RESET> = S
<-> = -
<+> = +
<ENTER> = E
then a password "-E+S" means pressing push buttons according to the following sequence:
<-> <ENTER> <+> <SELECT/RESET>

Woodward Manual XRI1-IR
20 DOK-TD-XRI1-IR, Rev. C
After the password is given correctly, parameter setting is permitted for five minutes. This means: For a subse-
quent parameter setting, as long as it is made within five minutes after the password input, a renewed password
input is not required. Moreover, the valid period for parameter setting is automatically extended to further 5
minutes after each new push button operation.
If no push button operation follows within the five minute period after password input, the validity for parameter
setting will be suspended.
For entering further parameters the password is then called up again. During the validity for parameter set-ting a
new set value, after having acknowledged "SAV" two times, is stored by just pressing push button <ENTER> for
some time.
As to parameter setting via RS 485 interface: see open data protocol.
5.5 Relay setting principle
By pressing push button <ENTER>, the parameter menu can be called up. By pressing push button
<SELECT/RESET> the parameter to be set is reached. The corresponding LED lights up. The actual set value
of the selected parameter is indicated on the display. The indicated set value can then be changed by pressing
push buttons <+><-> (in-/decrementing) see figure 5.2).
The selected set value is stored by pressing push button <ENTER> and by input of the authority code (pass-
word) which means the adjustment of the unit is only possible after the password had been put in. (see 5.4.2)
After a trip the push button <SELECT/RESET> is re-served for the indication of fault data. Now new parameter
setting by means of push button <SELECT/RESET> is only possible by pressing <ENTER> first.
5.5.1 Setting of default parameters
Setting of the XRI1-IR default parameters can be done as follows:
switch off the auxiliary voltage supply
press simultaneously push buttons <+><-> and <SELECT/RESET> and
switch on the auxiliary voltage supply again.
5.5.2 Blocking the protection function
The blocking function of the XRI1-IR-relays can be set according to requirement. When pressing push buttons
<ENTER> and <TRIP> at the same time the blocking mode is entered.