Voltage Relay
REU 610
T ec h n i c al Ref er en c e M an u al
3
C on ten ts
1. I n tr od u c ti on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1. This manual.................................................................... ...... 7
1.2. Use of symbols.... .......................................................... ...... 7
1.3. Intended audience.......................................................... ...... 8
1.4. Product documentation.... .............................................. ...... 8
1.5. Document conventions.... .............................................. ...... 8
2 . S af ety i n f or m ati on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 . P r od u c t ov er v i ew . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1. Use of the relay.............................................................. .... 11
3.2. Features.......................................................................... .... 11
4 . A p p li c ati on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1. Requirements.... ............................................................. .... 13
4.2. Configuration.... .............................................................. .... 13
5 . T ec h n i c al d es c r i p ti on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1. Functional description.... ................................................ .... 15
5.1.1. Product functions............................................... .... 15
5.1.1.1. Protection functions............................ .... 15
5.1.1.2. Inputs.... .............................................. .... 15
5.1.1.3. Outputs.... ........................................... .... 16
5.1.1.4. Disturbance recorder.... ...................... .... 16
5.1.1.5. Front panel.......................................... .... 16
5.1.1.6. Non-volatile memory........................... .... 17
5.1.1.7. Self-supervision.... .............................. .... 17
5.1.1.8. Time synchronization.......................... .... 18
5.1.2. Measurements................................................... .... 19
5.1.3. Configuration.... ................................................. .... 20
5.1.4. Protection........................................................... .... 22
5.1.4.1. Block diagram..................................... .... 22
5.1.4.2. Overvoltage protection.... ................... .... 22
5.1.4.3. Undervoltage protection.... ................. .... 24
5.1.4.4. Residual overvoltage protection......... .... 27
5.1.4.5. Circuit-breaker failure protection........ .... 28
5.1.4.6. Inverse definite minimum time
characteristcs...................................... .... 29
5.1.4.7. Settings.... ........................................... .... 35
5.1.4.8. Technical data on protection
functions.............................................. .... 45
5.1.5. Trip-circuit supervision.... .................................. .... 47
5.1.6. Trip lockout function.... ...................................... .... 49
5.1.7. Trip counters for circuit-breaker condition
monitoring.... ...................................................... .... 50
Voltage Relay
Technical Reference Manual
REU 610
1M RS 7 5 5 7 69
Issued: 31.01.2006
V ersion: A / 07.02.2006
5.1.8. Indicator L E Ds and operation indication
messages.... ...................................................... .... 50
5.1.9. Demand values.... ............................................. .... 51
5.1.10. Commissioning tests.... ..................................... .... 51
5.1.11. Disturbance recorder.... ..................................... .... 51
5.1.11.1. Function.... .......................................... .... 51
5.1.11.2. Disturbance recorder data.................. .... 52
5.1.11.3. Control and indication of disturbance
recorder status.................................... .... 53
5.1.11.4. Triggering............................................ .... 53
5.1.11.5. Settings and unloading....................... .... 54
5.1.11.6. E vent code of the disturbance
recorder............................................... .... 54
5.1.12. Recorded data of the last events.... ................. .... 54
5.1.13. Communication ports.... .................................... .... 56
5.1.14. IE C 60870-5-103 remote communication
protocol.... .................................... ......... ............. .... 57
5.1.15. Modbus remote communication protocol.... ..... .... 60
5.1.15.1. Protocol overview .... ........................... .... 60
5.1.15.2. Profile of Modbus RE U 610.... ........... .... 61
5.1.16. DNP 3.0 remote communication protocol.... .... .... 74
5.1.16.1. Protocol overview .... ........................... .... 74
5.1.16.2. Protocol parameters of RE U 610.... .. .... 75
5.1.16.3. DNP 3.0 point list of RE U 610........... .... 75
5.1.16.4. DNP 3.0 device profile of RE U 610........ 77
5.1.16.5. RE U 610-specific DNP features.... .... .... 85
5.1.17. SPA bus communication protocol
parameters......................................................... .... 88
5.1.17.1. E vent codes........................................ .. 103
5.1.18. Self-supervision ( IRF) system........................... .. 107
5.1.19. Relay parameterization.... ................................. .. 109
5.2. Design description.......................................................... .. 109
5.2.1. Input/ output connections.... ............................... .. 109
5.2.2. Serial communication connections.... ............... .. 116
5.2.3. Technical data.... ............................................... .. 122
6. O r d er i n g i n f or m ati on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7
6.1. A ccessories.... ................................................................ .. 128
7 . C h ec k li s ts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9
8 . A b b r ev i ati on s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5
4
REU 610
Voltage Relay
Technical Reference Manual
1MRS755769
5
C op yr i gh ts
The information in this document is subject to change without notice and
should not be construed as a commitment by ABB Oy. ABB Oy assumes no
responsibility for any errors that may appear in this document.
In no event shall ABB Oy be liable for direct, indirect, special, incidental or
consequential damages of any nature or kind arising from the use of this
document, nor shall ABB Oy be liable for incidental or consequential
damages arising from use of any software or hardware described in this
document.
This document and parts thereof must not be reproduced or copied without
written permission from ABB Oy, and the contents thereof must not be
imparted to a third party nor used for any unauthorized purpose.
The software or hardware described in this document is furnished under a
license and may be used, copied, or disclosed only in accordance with the
terms of such license.
Copyright © 2006 ABB Oy
All rights reserved.
T r ad em ar k s
ABB is a registered trademark of ABB Group. All other brand or product
names mentioned in this document may be trademarks or registered
trademarks of their respective holders.
G u ar an tee
Please inquire about the terms of guarantee from your nearest ABB
representative.
1MRS755769
Voltage Relay
Technical Reference Manual
REU 610
6
7
1. I n tr od u c ti on
1. 1. T h i s m an u al
This manual provides thorough information on the voltage relay R E U 610
and its applications, focusing on giving a technical description of the relay.
R efer to the Operator’s M anual for instructions on how to use the human-
machine interface ( H M I) of the relay, also known as the man- machine
interface ( M M I) , and to the Installation M anual for installation of the relay.
1. 2 . Us e of s ym b ols
This publication includes the following icons that point out safety- related
conditions or other important information:
The electrical warning icon indicates the presence of a hazard
which could result in electrical shock.
The warning icon indicates the presence of a hazard which could
result in personal injury.
The caution icon indicates important information or warning
related to the concept discussed in the tex t. It might indicate the
presence of a hazard which could result in corruption of software
or damage to equipment or property.
The information icon alerts the reader to relevant facts and
conditions.
The tip icon indicates advice on, for ex ample, how to design
your project or how to use a certain function.
Although warning hazards are related to personal injury, it should be
understood that operation of damaged equipment could, under certain
operational conditions, result in degraded process performance leading to
personal injury or death. Therefore, comply fully with all warning and
caution notices.
1MRS755769
Voltage Relay
Technical Reference Manual
REU 610
1. 3 . I n ten d ed au d i en c e
This manual is intended for operators and engineers to support normal use of
as well as configuration of the product.
1. 4 . P r od u c t d oc u m en tati on
In addition to the relay and this manual, the delivery contains the following
relay- specific documentation:
Table 1.4.-1 REU 610 product docu mentation
N am e D oc u m en t I D
Certificate of verification 1MRS081662
Installation Manual 1MRS752265-MUM
Operator’s Manual 1MRS755770
Table 1.4.-2 Other reference documentation for REU 610
N am e D oc u m en t I D
Modicon Modbus Protocol Reference G uide, Rev. E PI-MBUS-300
1. 5 . D oc u m en t c on v en ti on s
The following conventions are used for the presentation of material:
*
Push button navigation in the human- machine interface ( H M I) menu
structure is presented by using the push button icons, for ex ample:
To navigate between the options, use
and .
*
H M I menu paths are presented as follows:
Use the arrow buttons to select CONFIGURATION\COMMUNICATION
\SPA SETTINGS\PASSWORD SPA.
*
Parameter names, menu names, relay indication messages and relay' s H M I
views are shown in a Courier font, for ex ample:
Use the arrow buttons to monitor other measured values in the menus
DEMAND VALUES and HISTORY DATA.
*
H M I messages are shown inside quotation marks when it is good to point
out them for the user, for ex ample:
W hen you store a new password, the relay confirms the storage by
flashing “- - -” once on the display.
8
REU 610
Voltage Relay
Technical Reference Manual
1MRS755769
9
2 . S af ety i n f or m ati on
D angerous voltages can occur on the connectors, even though
the aux iliary voltage has been disconnected.
N on- observance can result in death, personal injury or
substantial property damage.
Only a competent electrician is allowed to carry out the electrical
installation.
N ational and local electrical safety regulations must always be
followed.
The frame of the device has to be carefully earthed.
W hen the plug- in unit has been detached from the case, do not
touch the inside of the case. The relay case internals may contain
high voltage potential and touching these may cause personal
injury.
The device contains components which are sensitive to
electrostatic discharge. Unnecessary touching of electronic
components must therefore be avoided.
Breaking the sealing tape on the upper handle of the device will
result in loss of guarantee and proper operation will no longer be
insured.
1MRS755769
Voltage Relay
Technical Reference Manual
REU 610
10
11
3 . P r od u c t ov er v i ew
3 . 1. Us e of th e r elay
The voltage relay R E U 610 is a versatile multifunction protection relay
mainly designed for overvoltage and undervoltage protection and for
supervision of medium voltage distribution networks. The relay can also be
used for protecting generators, motors and transformers.
The relay is based on a microprocessor environment. A self- supervision
system continuously monitors the operation of the relay.
The H M I includes a liquid crystal display ( L CD ) which makes the local use
of the relay safe and easy.
L ocal control of the relay via serial communication can be carried out with a
computer connected to the front communication port. R emote control can be
carried out via the rear connector connected to the control and monitoring
system through the serial communication bus.
3 . 2 . F eatu r es
*
Overvoltage protection with definite- time or ID M T characteristic, low- set
stage
*
Overvoltage protection with definite- time or ID M T characteristic, high- set
stage
*
Based on phase- to- phase voltage measurement or negative phase-
sequence ( N PS ) voltage
*
Undervoltage protection with definite- time or ID M T characteristic, low-
set stage
*
Can also be used as alarm stage
*
Undervoltage protection with definite- time or ID M T characteristic, high-
set stage
*
Based on phase- to- phase voltage measurement or positive phase-
sequence ( PPS ) voltage
*
R esidual overvoltage protection with definite- time characteristic, low- set
stage
*
R esidual overvoltage protection with definite- time characteristic, high- set
stage
*
Circuit- breaker failure protection
*
Trip counters for circuit- breaker condition monitoring
*
Trip- circuit supervision with possibility to route the warning signal to a
signal output
*
Trip lockout function
*
F our accurate voltage inputs
*
User- selectable rated voltage 100/ 110/ 115 / 120 V
*
User- selectable rated frequency 5 0/ 60 H z
1MRS755769
Voltage Relay
Technical Reference Manual
REU 610
*
Three normally open power output contacts
*
Two change- over signal output contacts and three additional change- over
signal output contacts on the optional I/ O module
*
Output contact functions freely configurable for wanted operation
*
Two galvanically isolated digital inputs and three additional galvanically
isolated digital inputs on the optional I/ O module
*
D isturbance recorder:
*
R ecording time up to 8 0 seconds
*
Triggering by one or several internal or digital input signals
*
R ecords four analog channels and up to eight user- selectable digital
channels
*
Adjustable sampling rate
*
N on- volatile memory for:
*
Up to 100 event codes with time stamp
*
S etting values
*
D isturbance recorder data
*
R ecorded data of the five last events with time stamp
*
N umber of starts for protection stages
*
Operation indication messages and L E D s showing the status at the
moment of power failure
*
H M I with an alphanumeric L CD and navigation buttons
*
E ight programmable L E D s
*
M ulti- language support
*
User- selectable password protection for the H M I
*
D isplay of primary voltage values
*
All settings can be modified with a PC
*
Optical front communication connection: wirelessly or via cable
*
Optional rear communication module with plastic fibre- optic, combined
fibre- optic ( plastic and glass) or R S - 4 8 5 connection for system
communication using the S PA- bus, IE C 608 7 0- 5 - 103 or M odbus ( R TU
and AS CII) communication protocol
*
Optional D N P 3 .0 rear communication module with R S - 4 8 5 connection
for system communication using the D N P 3 .0 communication protocol
*
Battery back- up for real- time clock
*
Time synchronization via a digital input
*
Battery charge supervision
*
Continuous self- supervision of electronics and software
*
At an internal relay fault, all protection stages and outputs are locked
*
D etachable plug- in unit
12
REU 610
Voltage Relay
Technical Reference Manual
1MRS755769
13
4 . A p p li c ati on
R E U 610 is a versatile multifunction voltage relay which is used in general
voltage supervision applications. It complements the range of feeder
protection relay R E F 610 and motor protection relay R E M 610 in industrial
outgoing feeder and motor feeder applications. The relay can also be used as
back- up protection for industrial as well as utility applications.
The large number of integrated protection functions, including two- stage
overvoltage protection, two- stage undervoltage protection and two- stage
residual overvoltage protection, makes the relay a complete protection against
various voltage fault conditions.
The large number of digital inputs and output contacts allows a wide range of
applications.
4 . 1. Req u i r em en ts
To secure correct and safe operation of the relay, preventive maintenance is
recommended to be performed every five years when the relay is operating
under the specified conditions; see Table 4 .1.- 1 and
S ection 5 .2.3 . Technical data.
W hen being used for real- time clock or recorded data functions, the battery
should be changed every five years.
Table 4.1.-1 Env ironmental conditions
Recommended temperature range ( continuous) -10...+ 55°C
L imit temperature range ( short-term) -40...+ 70°C
Temperature influence on the operation accuracy of the voltage
relay w ithin the specified service temperature range
0.1% / °C
Transport and storage temperature range -40...+ 85°C
4 . 2 . C on f i gu r ati on
The appropriate configuration of the output contact matrix enables the use of
the signals from the protection stages as contact functions. The start signals
can be used for blocking co- operating protection relays and signalling.
The F ig. 4 .2.- 1 represents the relay with the default configuration: all start
signals are routed to signal outputs and all trip signals to power outputs.
1MRS755769
Voltage Relay
Technical Reference Manual
REU 610
2
3
4
5
6
1
9
10
11
13
14
15
SGB4
SGB3
SGB2
SGB1
SGB5
1
2
3
4
9
11
12
SGR4
SGR3
SGR2 SGR1
SGR5
U>
U>> / U2>
U<
U<< / U1<
U
0
>
U
0
>>
SGR7
SGR8
SGR6
10
13
1
2
3
4
9
11
12
10
13
1
2
3
4
9
11
12
10
13
1
2
3
4
9
11
12
10
13
1
2
3
4
9
11
12
10
13
1
2
3
4
9
11
12
10
13
1
2
3
4
9
11
12
10
13
1
2
3
4
9
11
12
10
13
8
7
2
3
4
5
6
1
9
10
11
13
14
15
8
7
2
3
4
5
6
1
9
10
11
13
14
15
8
7
2
3
4
5
6
1
9
10
11
13
14
15
8
7
2
3
4
5
6
1
9
10
11
13
14
15
8
7
CBFP
~
X3.1
6 5 4 3 2 1
X4.1
SO1
PO2
SO2
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
21 22 23 24
SO4
SO5
SO3
X3.1
16 17 18 19 20 21 22 23 24
X2.1
7 8 1 2 3 4 5 6
L1
L2
L3
1 2
U
aux
~
12
12 12 12 12
A
N
a
n
da
dn
5
6
5
6
5
6
5
6
5
6
5
6
5
6
5
6
7
8
7
8
7
8
7
8
7
8
7
8
7
8
7
8
0
1
O
I
-
-
+
+ +
PO3
PO1
SGF1...SGF5
SGL1...SGL8
DI3
DI2
DI1
DI4
DI5
Optional
Start
Trip
Blocking
Start
Trip
Blocking
Indications cleared
Output contacts unlatched
Mem orized values cleared
Setting group selection
Time sync
External Trip
External trip
Blocking
Blocking
Start
Trip
Blocking
Start
Trip
External Triggering
Reset
Trip lockout
Optional
External Triggering Trip
W arning
Trip lockout
Self-supervision
IRF
Blocking
IRF
Start
Trip
Start
Trip
A 051474
Fig. 4.2.-1 Connection diagram
14
REU 610
Voltage Relay
Technical Reference Manual
1MRS755769
15
5 . T ec h n i c al d es c r i p ti on
5 . 1. F u n c ti on al d es c r i p ti on
5 . 1. 1. P r od u c t f u n c ti on s
5 . 1. 1. 1. P r otec ti on f u n c ti on s
Table 5 .1.1.1.-1 I EC s y mbols and I EEE dev ice numbers
F u n c ti on d es c r i p ti on I EC s ym b ol I EEE d ev i c e
n u m b er
Overvoltage protection, low -set stage U> 59P-1
Overvoltage protection, high-set stage U> > 59P-2
Negative phase-sequence overvoltage
protection
U
2
> 47
Undervoltage protection, low -set stage U< 27P-1
Undervoltage protection, high-set stage U< < 27P-2
Positive phase-sequence undervoltage
protection
U
1
< 27D
Residual overvoltage protection, low -set stage U
0
> 59N-1
Residual overvoltage protection, high-set
stage
U
0
> > 59N-2
Circuit-breaker failure protection CBFP CBFA IL
L ockout relay 86
F or protection function descriptions, refer to S ection 5 .1.4 . Protection.
5 . 1. 1. 2 . I n p u ts
The relay is provided with four energizing inputs, two digital inputs and three
optional digital inputs controlled by an ex ternal voltage. Three of the
energizing inputs are for the phase- to- phase voltages and one for the residual
voltage.
The relay is mainly designed to measure phase- to- phase
voltages, but it can be used for measuring phase- to- earth
voltages as well. H owever, the relay does not convert the voltage
from phase- to- earth voltage to phase- to- phase voltage.
The functions of the digital inputs are determined with the S GB switches. F or
details, refer to S ection 5 .2.1. Input/ output connections and Table 5 .1.4 .7 .- 7 ,
Table 5 .2.1.- 1 and Table 5 .2.1.- 5 .
1MRS755769
Voltage Relay
Technical Reference Manual
REU 610
5 . 1. 1. 3 . O u tp u ts
The relay is provided with:
*
Three power output contacts PO1, PO2 and PO3
*
Two signal output contacts S O1 and S O2
*
Three optional signal output contacts S O3 , S O4 and S O5
S witchgroups S GR 1...8 are used for routing internal signals from the
protection stages and the ex ternal trip signal to the wanted signal or power
output contact. The minimum pulse length can be configured to be 4 0 or 8 0
ms and the power output contacts can be configured to be latched.
5 . 1. 1. 4 . D i s tu r b an c e r ec or d er
The relay includes an internal disturbance recorder which records the
momentary measured values or the R M S curves of the measured signals, and
up to eight user- selectable digital signals: the digital input signals and the
internal signals from the protection stages. Any digital signal can be set to
trigger the recorder on either the falling or rising edge.
5 . 1. 1. 5 . F r on t p an el
The front panel of the relay contains:
*
Alphanumeric 2 × 16 characters’ L CD with backlight and automatic
contrast control
*
Three indicator L E D s ( green, yellow, red) with fix ed functionality
*
E ight programmable indicator L E D s ( red)
*
H M I push- button section with four arrow buttons and buttons for clear/
cancel and enter, used in navigating in the menu structure and in adjusting
setting values
*
Optically isolated serial communication port with an indicator L E D .
An H M I password can be set to protect all user- changeable values from being
changed by an unauthorized person. The H M I password remains inactive and
is not required for altering parameter values until the default H M I password is
replaced.
E ntering the H M I password successfully can be selected to
generate an event code. This feature can be used to indicate
interaction activities via the local H M I.
F or further information on the H M I, refer to the Operator’s M anual.
16
REU 610
Voltage Relay
Technical Reference Manual
1MRS755769
17
5 . 1. 1. 6. N on - v olati le m em or y
The relay can be configured to store various data in a non- volatile memory,
which retains its data also in case of loss of aux iliary voltage ( provided that
the battery has been inserted and is charged) . Operation indication messages
and L E D s, disturbance recorder data, event codes and recorded data can all
be configured to be stored in the non- volatile memory whereas setting values
and trip counters are always stored in the E E PR OM . The E E PR OM does not
require battery backup.
5 . 1. 1. 7 . S elf - s u p er v i s i on
The self- supervision system of the relay manages run- time fault situations
and informs the user about an ex isting fault. There are two types of fault
indications; internal relay fault ( IR F ) indications and warnings. Internal relay
faults prevent relay operation. W arnings are less severe faults and continued
relay operation with full or reduced functionality is allowed.
I n ter n al r elay f au lt ( I RF )
W hen the self- supervision system detects a permanent internal relay fault, the
green indicator L E D starts to flash. At the same time, the IR F contact ( also
referred to as the IR F relay) , which is normally picked up, drops off. The tex t
INTERNAL FAULT and a fault code appear on the display.
INTERNAL FAULT
FAULT CODE :30
A 040278
Fig. 5 .1.1.7 .-1 P ermanent I R F
W ar n i n g
In case of a less severe fault ( warning) , the relay continues to operate ex cept
for those protection functions possibly affected by the fault. At this type of
fault, the green indicator L E D remains lit as during normal operation, but the
tex t WARNING with a fault code or a tex t message indicating the fault type
appears on the L CD . In case of a warning due to an ex ternal fault in the trip
circuit detected by the trip- circuit supervision, S O2 is activated ( if S GF 1/
8 = 1) .
1MRS755769
Voltage Relay
Technical Reference Manual
REU 610
W ARNING
B ATTERY LOW
A 040279
Fig. 5 .1.1.7 .-2 W arning w ith tex t mes s age
W ARNING
FAULT CODE: 33
A 040280
Fig. 5 .1.1.7 .-3 W arning w ith nu meric code
F or fault codes, refer to 5 .1.18 . S elf- supervision ( IR F ) system
5 . 1. 1. 8 . T i m e s yn c h r on i z ati on
Time synchronization of the relay’s real- time clock can be realized in two
different ways: via serial communication using a communication protocol or
via a digital input.
W hen time synchronization is realized via serial communication, the time is
written directly to the relay’s real- time clock.
Any digital input can be configured for time synchronization and used for
either minute- pulse or second- pulse synchronization. The synchronization
pulse is automatically selected and depends on the time range within which
the pulse occurs. Two detected pulses within acceptable time range are
required before the relay activates pulse synchronization. R espectively, if the
synchronization pulses disappear, the relay takes time that corresponds to the
time range of four pulses before de- activating pulse synchronization. The
time must be set once, either via serial communication or manually via the
H M I.
W hen the time is set via serial communication and minute- pulse
synchronization is used, only year- month- day- hour- minute is written to the
relay’s real- time clock, and when second- pulse synchronization is used, only
year- month- day- hour- minute- second is written. The relay’s real- time clock
will be rounded to the nearest whole second or minute, depending on whether
second- or minute- pulse synchronization is used. W hen the time is set via the
H M I, the entire time is written to the relay’s real- time clock.
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REU 610
Voltage Relay
Technical Reference Manual
1MRS755769
19
If the synchronization pulse differs more than ± 0.05 seconds for second- pulse
or ± 2 seconds for minute- pulse synchronization from the relay’s real- time
clock, the synchronization pulse is rejected.
Time synchronization is always triggered on the rising edge of the digital
input signal. The time is adjusted by accelerating or decelerating the relay' s
clock. By this way the clock neither stops nor makes sudden jumps during the
time adjustment. The typical accuracy achievable with time synchronization
via a digital input is ± 2.5 milliseconds for second- pulse and ± 5 milliseconds
for minute- pulse synchronization.
The pulse length of the digital input signal does not affect time
synchronization.
If time synchronization messages are received from a
communication protocol as well, they have to be synchronized
within ± 0.5 minutes at minute- pulse or ± 0.5 seconds at second-
pulse synchronization. Otherwise the time difference may
appear as rounding errors. If it is possible that the
synchronization messages from the communication protocol are
delayed more than 0.5 seconds, minute- pulse synchronization
must be used.
W hen the minute- pulse synchronization is active and long time
format is sent via a communication protocol, the protocol' s
second and millisecond part is ignored. The protocol' s minute
part is rounded to the nearest minute. S hort time format is
ignored altogether.
W hen the second- pulse synchronization is active and long or
short time format is sent via a communication protocol, the
protocol' s millisecond part is ignored. The protocol' s second- part
is rounded to the nearest second.
5 . 1. 2 . M eas u r em en ts
The table below presents the measured values which can be accessed through
the H M I.
Table 5 .1.2.-1 M eas ured v alues
I n d i c ator D es c r i p ti on
U
12
Measured phase-to-phase voltage U
12
U
23
Measured phase-to-phase voltage U
23
U
31
Measured phase-to-phase voltage U
31
U
0
Measured residual voltage U
0
1MRS755769
Voltage Relay
Technical Reference Manual
REU 610
Table 5 .1.2.-1 M eas ured v alues ( C ontinued)
I n d i c ator D es c r i p ti on
U
1s
Positive phase-sequence voltage
U
2s
Negative phase-sequence voltage
Ū 1_ min The average voltage of the three phase-to-phase voltages during one
minute
Ū n_ min The average voltage of the three phase-to-phase voltages during the
specified time range
Max Ū The max imum of one-minute average voltage of the Ū n_ min
U
max
The max imum voltage of the three phase-to-phase voltages since the
last reset ( w ith timestamp)
U
min
The minimum voltage of the three phase-to-phase voltages since the
last reset ( w ith timestamp)
5 . 1. 3 . C on f i gu r ati on
The F ig. 5 .1.3 .- 1 illustrates how the internal and digital input signals can be
configured to obtain the required protection functionality.
20
REU 610
Voltage Relay
Technical Reference Manual
1MRS755769
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