7. 4. 3 Connection variants for voltage measurement 24
7. 5 Current measurement 24
7. 5. 1 Current measurement connection variants 25
7. 5. 2 Direction of the current 26
7. 5. 3 Total current measurement 26
7. 5. 4 Ammeter 26
8. Interface 27
8. 1 Screening 27
8. 2 Termination resistors 28
8. 3 Bus structure 29
9. Digital inputs and outputs 30
9. 1 Digital inputs 30
9. 1. 1 S0 pulse input 31
9. 2 Digital outputs 31
9. 3 LED status bar 32
10. Analog output 33
11. Operation 34
11. 1 Key assignment 34
11. 2 Measurement value display
"Overview" 34
11. 3 Option menu 34
11. 4 Overview of menu displays 35
3
UMG 96-PA www.janitza.de
12. Configuration 36
12. 1 Language 36
12. 2 Communication 36
12. 3 Measurement 37
12. 3. 1 Rated current 37
12. 3. 2 Current and voltage transformers / Nominal current 39
12. 4 System 40
12. 4. 1 Firmware / Serial number 40
12. 4. 2 Time 40
12. 4. 3 Password 40
12. 4. 4 Reset 41
12. 5 Display 43
12. 6 Colors 44
12. 5. 1 Brightness 44
12. 5. 2 Standby 44
12. 5. 3 Brightness (standby) 44
13. Putting the device into service 45
13. 1 Supply voltage 45
13. 2 Measured voltage 45
13. 3 Frequency measurement 46
13. 4 Rotary field direction 46
13. 4. 1 Phasor diagram basics 47
13. 5 Measurement current 48
13. 6 Measurement range violation 49
13. 7 Checking the power measurement 49
13. 8 Checking communication 50
13. 9 Delete min./max. values
individually 50
13. 10 Harmonics 51
13. 11 Communication in the bus system 52
13. 11. 1 RS485
52
13. 12 Digital inputs/outputs 53
13. 12. 1 Digital
inputs 53
13. 12. 2 Digital
outputs 55
13. 13 Analog output 60
13. 14 “Drag indicator” function 61
13. 14. 1 Internal synchronization 61
13. 14. 2 External synchronization 62
13. 14. 3 Synchronization priority 64
13. 15 Recordings 65
13. 16 Tariff switching 66
4
www.janitza.deUMG 96-PA
14. Overview of measurement value displays 68
15. Service and maintenance 74
15. 1 Repairs 74
15. 2 Front film 74
15. 3 Disposal 74
15. 4 Service 74
15. 5 Device calibration 74
15. 6 Re-calibration 74
15. 7 Firmware update 74
15. 8 Battery 75
15. 9 Procedure in the event of an error 76
16. Technical Data 77
16. 1 Function performance characteristics 80
16. 2 Modbus address list of frequently used measurement values: 82
16. 3 Number formats 83
16. 4 Dimension views 84
16. 5 Connection example 1 85
5
UMG 96-PA www.janitza.de
1. General
1. 1 Disclaimer
Compliance with the information products
for the devices is a precondition for the safe
operation and for achieving the stated performance and product characteristics. Janitza
electronics GmbH does not accept any
liability for personal injury, material damage
or financial loss incurred as a result of not
complying with the information products.
Ensure that your information products are
kept easily accessible to read.
We welcome your comments. If anything in
this manual seems unclear to you, please let
us know by sending an e-mail to:
info@janitza.de
• Ensure that your device corresponds to the
installation guide.
• First, read and understand the documents
included with the product.
• Keep the product documents available
for the entire life cycle of the product and
provide them to any subsequent users.
• Learn about device revisions and the corresponding updates to the product documentation at www.janitza.de.
1. 4 Declaration of Conformity
The laws, norms and guidelines applied by
Janitza electronics GmbH in the production
of this product can be found in the declaration of conformity at www.janitza.de.
6
www.janitza.deUMG 96-PA
7
UMG 96-PA www.janitza.de
2. Safety
Please read this user manual as well as all
other publications that must be referred to
for working with this product. This applies
especially to installation, operation and maintenance.
Please follow all safety instructions and warnings. Not following the instructions may result
in personal injury or damage to the product.
Any unauthorized modifications to or use of
this device that exceeds its stated mechanical, electric or other operational limits may
result in personal injury or damage to the
product.
Any such unauthorized modification constitutes "misuse" and/or "negligence" in the
meaning of the warranty for this product,
and therefore invalidates the warranty for the
coverage of possible damages occurring as
a result.
The User Manual:
2. 1 Safety Instructions
Symbols used:
As an addition to the safety in-
c
C
Safety instructions are marked with a warning
triangle and depicted as follows depending
on the degree of hazard:
m
HAZARD!
structions, this symbol indicates
an electrical hazard.
Together with the word "Instructions," this symbol describes:
• Procedures that do not entail
any risk of injury.
• Important information, procedures or actions.
Indicates an immediate hazard
that results in serious or fatal
injury.
• Read before operating the device.
• Keep available for the entire life cycle of
the product and for reference.
Comply with the legal and safety guidelines
required additionally for the specific instance
of application when using the device.
m
WARNING!
m
CAUTION!
Indicates a possibly hazardous
situation that may result in serious or fatal injury.
Indicates a possibly hazardous
situation that may result in minor injury or material damage.
8
www.janitza.deUMG 96-PA
2. 2 Safety Measures
When electrical devices are in operation,
certain parts of these devices are necessarily subject to dangerous levels of voltage.
Serious bodily harm or material damage
may therefore result if they are not handled
properly:
c
WARNING!
Serious bodily harm or death may result
from hazardous voltages.
For this reason, please note the following:
• Before making connections, ground
the device on the protective earth terminal, if available.
• Hazardous voltages can occur in any
of the circuits connected to the voltage supply.
• There may be hazardous voltages inside the device even after disconnecting the voltage supply.
• Outfit single-wire leads with ferrules.
• Only connect screw terminals with the
same number of poles that are of the
same make.
• Before starting to work, de-energize
the system.
Risk of injury from electric
voltage!
2. 3 Qualified Staff
This device is to be operated and maintained
only by qualified staff.
Qualified staff are people who are able to
recognize risks and avoid possible hazards
that the operation or maintenance of the
device may cause, based on their specialized
training and their experience.
c
WARNING!
If the device is not operated in accordance
with the documentation, safety is no longer
ensured and the device may pose a risk.
Risk of Injury from
Improper Use
9
UMG 96-PA www.janitza.de
3. Intended Use
3. 1 Input Check
Proper transport and professional storage,
installation and assembly, as well as careful
control and maintenance, are all preconditions for the proper and safe operation of this
device.
Perform unpacking and packing with the usual care and without the use of force, and only
use suitable tools.
Perform a visual inspection of the devices to
ensure a proper mechanical condition.
Check the delivery contents for completeness before starting to install the device.
If it is to be assumed that safe operation
is no longer possible, the device is to be
placed out of order immediately and protected against unintended operation. It is to
be assumed that safe operation is no longer
possible if the device e.g.:
3. 2 Intended Use
The device is:
• intended to be built into control cabinets
and small distribution boards.
• not intended to be built into vehicles! The
use of the device in mobile equipment is
considered an exceptional environment
condition, and is only admissible with a
separate agreement.
• not intended to be built into environments
with hazardous oils, acids, gases, fumes,
dust, radiation, etc.
C
ATTENTION!
All of the screw terminals included in
the delivery contents are connected
to the device.
• shows visible signs of damage,
• no longer functions despite an intact power supply,
• has been exposed to longer periods of
adverse conditions (e.g. storage not consistent with the admissible climate limits
without an adjustment of the room climate,
thawing, etc.) or transport stresses (e.g.
fall from a great height even without any
outward visible signs of damage, etc.).
C
ATTENTION!
All of the delivered options and
design variants are described on the
delivery note.
Screw terminal, pluggable, 10-pole
(digital inputs/outputs, analog output)
152.22.251Mounting Kit
1)
See delivery note for item number
3. 4 Deliverable accessories
Item no.Name
21.01.058
Lithium battery CR2032, 3 V
(Authorization as per UL 1642)
29.01.065Seal, 96 x 96
15.06.015Interface converter RS485 <-> RS232
15.06.025Interface converter RS485 <-> USB
11
UMG 96-PA www.janitza.de
4. Product Description
The device is intended for:
• the measurement and calculation of electrical quantities such as voltage, current,
power, energy, harmonics in the building
installation, on distributors, circuit breakers
and busbar distributors.
• the measurement of measuring voltages and currents originating in the same
network.
• measurements in low-voltage networks
in which rating voltages of up to 600 V
conductor to ground and surges of overvoltage category III may occur.
• Measurement in medium and high-voltage
networks usually does not occur through
current or voltage transformers.
• being built into non-mobile control cabinets or small distribution boards. The
position at which it is built in is arbitrary.
• measurement in medium- and high-voltage
networks with current and voltage transformers.
• use in domestic and industrial settings.
• the measurement of current via external
../1 A or ../5 A current transformers.
• Directly on the device using the 6 keys
and the display.
• Via the programming software GridVis®.
• You can change and open data with the
help of the Modbus address list via the
Modbus protocol. You can find this list at
www.janitza.de.
This user manual only describes the 6-key
operation of the device. The network analysis
software GridVis® has its own "Online Help
Guide."
4. 3 Network Analysis Software
GridVis®
You can program the device and read out the
data with the network analysis software GridVis® available at www.janitza.de. To do this,
a PC must be connected to the device e.g.
via a serial interface (RS485) or via a gateway
connection.
With the network analysis software GridVis®,
you can:
The measurement results can be displayed
and read out via the device interface for further processing.
4. 1 Measurement Procedure
The device:
• continuously measures and calculates all
effective values over a 200 ms interval.
• measures the real effective value (TRMS)
of the voltages and currents connected to
the measurement inputs.
4. 2 Operating Design
You can program the device in many ways
and/or recall measurement values.
• program the device.
• configure and read out recordings.
• analyze the data you read out.
• save data in the database.
• display measurement values graphically.
• program client-specific applications.
Malfunction can result
c
CAUTION!
If the device is connected improperly, it may
deliver measurement values with errors.
For this reason, please note the following:
• Measurement voltages and measurement currents must come from the
same network.
• Do not use the device to measure
direct current.
• Earth the conducting patch boards.
from an improper
connection
12
www.janitza.deUMG 96-PA
4. 4 Performance characteristics
General
• Front board installation device measuring 96 x 96 mm
• Expansion by modules
• Connection via plug-in terminals with screw connections
• Color graphics display 320 x 240 px
• Control via 6 keys
• 3 voltage measurement inputs (600 V, CAT III)
• 3 current measurement inputs (via current transformer)
• 3 digital outputs
• 3 digital inputs
(configured as impulse counters with simultaneous power calculation
• 1 analog output (0 - 20 mA)
• Data storage 4 MByte Flash
• RS485 interface (Modbus RTU, Slave, up to 115 kbps)
• Recording of more than 2,000 measurement values
• Clock and battery
• Operating temperature range -10 °C .. +55 °C
Measurement uncertainty
• Active energy, measurement uncertainty class 0.5S for ../5A transformers
• Active energy, measurement uncertainty class 1 for ../1A transformers
• Reactive energy class 1
Measurement
• Recording of more than 800 measurement values
• Measurement in TN and TT networks
• Measurement in networks with rated voltages of up to L-L 720 Vrms and L-N 417 Vrms
(as per IEC)
• Measurement range for current 0.005 .. 6 Arms
• Real active value measurement (TRMS)
• continuous sampling of voltage and current measurement inputs
• Frequency range of the fundamental oscillation 45 Hz .. 65 Hz
• Measurement of the harmonics 1 to 25 for ULN and I
• ULN, ULL, I, P (drawn/delivered), Q (ind./cap.)
• 2 tariffs (switching via Modbus or digital input 1)
13
UMG 96-PA www.janitza.de
4. 5 Product Overview
1
2
Fig. Front view of UMG 96-PA
3
4
5
8
7
6
1 Device Type
2 Description of the function keys
3 Key 1: Configuration menu, Back (ESC)
4 Key 2: Select digit, set option field ()
5 Key 3: Lower digit by 1, select menu item (), set option field ()
6 Key 4: Increase digit by 1, select menu item (), set option field ()
7 Key 5: Select digit, set option field ()
8 Key 6: Open option menu, activate entry, confirm selection (Enter)
14
www.janitza.deUMG 96-PA
1
8
Fig. Back view of UMG 96-PA
2
345
6
7
1 Supply voltage
2 RS485 interface
3 Digital inputs
4 Digital outputs
5 Analog output
6 Module connector
7 Current measurement inputs I1 to I3
8 Voltage measurement inputs V1 to V3
15
UMG 96-PA www.janitza.de
5. Installation
5. 1 Installation site
The device is suitable for installation in
non-mobile and weather-protected control
panels in indoor environments.
Plan on an earth for conducting control panels.
Material damage may
m
CAUTION!
result if the installation in-
structions are not followed!
Not following the installation instructions
may damage or destroy your device.
Comply with the details on the installation
position in sections „Installation“ and
„Technical Data“.
5. 2 Installation position
The cut-out dimensions of the control panel
are 92
+0,8
mm x 92
+0,8
mm.
To achieve sufficient ventilation, take the
following measures:
• Install the device vertically.
• Maintain a minimum clearance of 50 mm
above and below.
• Maintain a minimum clearance of 20 mm
on each side.
5. 3 Securing the device
The device is secured in the control panel
with the side mounting brackets. The brackets are to be removed e.g. using a screwdriver as a horizontal level before the device
is put in.
Fig. Side view of UMG 96-PA with mounting brackets.
The brackets can be loosened by leveraging them horizontally with a screwdriver.
Then slide in and snap the brackets into
place, and finally screw in the screws to secure the device.
• Turn the clamping screws until they just
touch the assembly plate.
• Then tighten the clamping screws with two
more rotations each (the mounting brackets may be destroyed if the screws are
tightened too much).
16
Fig. Back view of the installation posi-
tion of the UMG 96-PA
Assembly plate
Mounting
brackets
Clamping screw
Once the clamping screws
touch the surface of the
assembly plate: use two further
rotations at most to secure
the device
Screwdriver
www.janitza.deUMG 96-PA
L1
E
L1L2
L3E
N
R
L1
L2L3EE
L1
L2L3EE
6. Network systems
Network systems and maximum rated voltages as per DIN EN 61010-1/A1:
Three-phase four-wire systems
with earthed neutral conductor
L2
N
L3
IEC U
UL U
L-N
L-N
/ U
417 VLN / 720 VLL
L-L:
/ U
347 VLN / 600 VLL
L-L:
EE
The device can be used in
• TN and TT networks
• domestic and industrial areas.
c
WARNING!
Risk of injury from
electric voltage!
If the device is exposed to measurement
voltage surges above the admissible overvoltage category, safety-related insulations
in the device may be damaged, whereupon
the safety of the product can no longer be
guaranteed.
Only use the device in environments in
which the admissible measurement surge
voltage is not exceeded.
17
UMG 96-PA www.janitza.de
6. 1 Voltage measurement
You can use the UMG 96-PA to measure voltage in TN and TT systems.
Voltage measurement in the UMG 96-PA is
designed for the overvoltage category 600V
CATIII (measurement surge voltage 6 kV).
347V/600V 50/60Hz
L1
L2
L3
N
PE
L1
240V
50/60Hz
N
In systems without N, the measurement values that require an N are based on a calculated N.
c
WARNING!
Risk of injury from electric
voltage!
If voltage transformers are used, the connections on the secondary side may not be
short-circuited!
For this reason, please note the following:
• Check that the
voltage transformers have been properly installed. To do this, read the respective information about the voltage
transformers.
V1V3V2VN
AC/DC
4M
4M
4M
Voltage measurement
UMG 96-PA
Fig. Principle circuit diagram - Measurement in three-
phase 4-wire systems.
4M
Auxiliary energy
DC
18
www.janitza.deUMG 96-PA
6. 2 Rated voltages
The following figures show lists of the networks and the corresponding network rated
voltages at which the device can be used.
6. 2. 1 Three-phase 4-wire network with
earthed neutral conductor
Fig. Network rated voltages as per EN 60664-1:2003
suited for measurement inputs
19
UMG 96-PA www.janitza.de
7. Installation
7. 1 Connection to a PC
There are various options for connecting the
device to a PC:
1. Connection via an
interface converter:
PC with GridVis®
UMG 96-PA
RS232
RS232
RS485
RS485
PC with GridVis®
UMG 96-PA
USB
USB
RS485
RS485
2. Use of the UMG 96-PA (slave) via a UMG
(master) with gateway functionality (e.g.
UMG 512)
PC with GridVis®
Ethernet
Ethernet
20
UMG 512-PRO
as gateway
UMG 96-PA
Slave 1
ModbusModbusModbus
UMG 96-PA
Slave 2
UMG 103
Slave 3
www.janitza.deUMG 96-PA
7. 2 Circuit breaker
For building installation, plan for a suitable
circuit breaker for the supply voltage to
de-energise the device.
• The circuit breaker must be installed near
the device and easily accessible to the
user.
• The switch must be marked as the circuit
breaker for this device.
7. 3 Supply voltage
The device needs a supply voltage to operate. The type and amount of supply voltage
required for your device can be found on the
ratings plate.
The supply voltage is connected on the rear
of the device via terminal blocks.
Before connecting the supply voltage, ensure
that the voltage and frequency correspond to
the details on the ratings plate.
Connect the supply voltage through a UL/IEC
approved fuse.
After the supply voltage has been connected, an indicator will appear on the display. If
no indicator appears, check that the supply
voltage is within the rated voltage range.
m
CAUTION!
result from failure to com-
ply with the connection
requirements.
Noncompliance with the connection requirements may result in your device being
damaged or destroyed.
For this reason, please note the following:
• Comply with the details on voltage and
frequency on the ratings plate.
• Connect the supply voltage through a
fuse in accordance with the technical
specifications.
• Do not source the supply voltage on
the voltage transformers.
• Plan for a fuse for the neutral conductor if the neutral conductor connection
to the source is not earthed.
L
N
PE/FE
1.)
Material damage may
1.)
2.)
Fuse
(UL/IEC listed)
2.)
Disconnector
(Circuit breaker)
Functional earth
c
WARNING!
Risk of injury from electric
voltage!
Serious bodily harm or death may result
from:
• Touching bare or stripped wires that are
live.
• Inputs on the device that are dangerous
to touch.
For this reason, please note the
following:
• The inputs for supply voltage are
dangerous to touch.
• De-energise your system before
starting work!
Fig. Connection example for supply voltage
ATTENTION!
C
If the functional earth is not
connected, the device displays a
non-applied residual voltage.
21
UMG 96-PA www.janitza.de
Overcurrent protective device for the
line protection of the supply voltage
Recommendation for the overcurrent protective device for the line protection of the
supply voltage, depending on the variants:
• Option 230 V:
6 - 16 A (Char. B)
• Option 24 V:
1 - 6 A (Char. B)
C
Recommendation for the maximum number
of devices on one miniature circuit breaker,
depending on the variants:
• Option 230 V:
• Option 24 V:
ATTENTION!
The circuit breaker serves only as
line protection - it does not provide
protection for the device!
For one miniature circuit breaker B6A,
maximum of 4 devices.
For one miniature circuit breaker B16A,
maximum of 11 devices.
For one miniature circuit breaker B6A,
maximum of 3 devices.
For one miniature circuit breaker B16A,
maximum of 9 devices.
7. 4 Measured voltage
The device has 3 voltage measurement inputs (V1 to V3) on the back of the device.
7. 4. 1 Overvoltage
The voltage measurement inputs are suitable for measurement in networks in which
overvoltage of category 600 V CAT III (voltage
measurement surge of 6 kV) may occur.
7. 4. 2 Frequency
The device:
• requires the network frequency to measure
and calculate the measurement values.
• is suitable for measurement in networks
in which the fundamental oscillation of the
voltage is within the range of 45 to 65 Hz.
The network frequency is derived from the
measured voltage in phase L1. The sampling
rate of the voltage and current measurement
inputs is derived from the network frequency.
If the measurements have severely distorted voltages, it will no longer be possible to
precisely determine the frequency of the
fundamental oscillation of the voltage. I.e. the
corresponding network frequency should be
stipulated for measured voltages that exhibit
severe distortions.
(Voltage distortions occur e.g. in measurements of consumers operated with a phase
angle control). Current distortions do not
affect the determination of the frequency.
22
More information can be found in Section 12
Configuration / Rated frequency"
www.janitza.deUMG 96-PA
1.)
Fuse
1)1)1)
2)2)2)
Fig. Connection example for voltage measurement.
(UL/IEC listed)
2.)
Disconnector
(Circuit breaker)
L1
L2
L3
N
c
WARNING!
Risk of injury from electric
voltage!
Serious bodily harm or death may result
from not complying with the connection
requirements for the voltage measurement
inputs.
For this reason, please note the following:
• De-energise your system before
starting work! Check that it has been
de-energised!
• Connect voltages that are over the
admissible network rated voltages
through voltage transformers.
• The voltage measurement inputs on
the device are dangerous to touch!
• Install a circuit breaker as described in
Section „7. 2 Trennschalter“.
• Use a UL/IEC approved overvoltage
protective device with a rating value
that is measured for short-circuit current at the point of connection.
c
CAUTION!
Malfunction can result from
an improper connection
If the device is connected improperly, it may
deliver measurement values with errors.
For this reason, please note the following:
• Measurement voltages and currents
must come from the same network.
• The device is not suitable for measuring direct current.
ATTENTION!
C
The device can only determine measurement values if there is a voltage
L1-N greater than 20 Veff (4-wire
measurement) or a voltage L1-L2
greater than 34 Veff (3-wire measurement) at the voltage measurement
input V1.
As an overvoltage
protective device for the voltage
measurement, use a line protection
(1 - 10 A) with IEC/UL approval.
23
UMG 96-PA www.janitza.de
7. 4. 3 Connection variants for voltage
measurement
V1
V2
Fig. Voltage measurement in the three-phase
four-wire system
V1
V2
V3
V3
VN
VN
7. 5 Current measurement
The device:
• is designed to be connected to current
transformers with secondary currents of
../1 A and ../5 A.
• is only approved for measuring current
through current transformers.
• does not measure direct currents.
The factory preset current transformer ratio
is 5/5 A, and may need to be adjusted to the
current transformer in use.
Fig. Voltage measurement in the three-phase
four-wire system
V1
V2
Fig. Voltage measurement in the single-phase
three-wire system
V3
VN
L1
L2
L3
N
Fig. Connection example "Current measurement through
a current transformer."
S1 S2
S1 S2
S1 S2
24
www.janitza.deUMG 96-PA
7. 5. 1 Current measurement connection
m
WARNING!
tric voltage on the current
transformers!
Voltage peaks that are extremely dangerous
to touch may occur on current transformers
operated with an open secondary side
that may result in serious bodily harm or
death.
For this reason, please note the following:
• De-energise your system before starting work! Check that it has been de-energised!
• Avoid open operation of the current
transformers.
• Short-circuit uncharged current transformers.
• The secondary terminals of the current
transformer must be short-circuited
before the power supply lines are disconnected.
• If a test switch that automatically
short-circuits the current transformer
secondary leads is available, it is sufficient to put this into the "test" position
provided the short-circuiters have been
checked beforehand.
• Only use current transformers
that have a base insulation as per
IEC 61010-1:2010.
• Ensure that the attached screw terminal is sufficiently secured to the device
with the two screws.
• Even "open-safe" current transformers are dangerous to touch if they are
operated openly.
Risk of injury from elec-
variants
Fig.
Current measurement
via current transformer in three-phase
four-conductor
system
Fig.
Current measurement in
single-phase three-conductor system
Fig.
Current measurement via
2 current transformers in
three-phase four-conductor
system
m
WARNING!
Risk of injury from electric
voltage!
At high measurement currents, temperatures
of up to 80 °C can develop at the terminals.
Therefore, use leads that are designed to
have an operating temperature of at least
80 °C.
25
UMG 96-PA www.janitza.de
7. 5. 2 Direction of the current
The current direction can be individually corrected on the device or via the serial interfaces for each phase.
In the case of incorrect connection, the current transformer does not need to be subsequently reconnected.
7. 5. 3 Total current measurement
If the current measurement takes place via
two current transformers, the total transformer ratio of the current transformer must be
programmed on the device. Setting the current transformer ratios is described in Section
„Messwandler“.
Example:
The current measurement is performed via
two current transformers. Both current transformers have a transformer ratio of 1000/5 A.
The total measurement is then carried out
with a total current transformer 5+5/5 A .
7. 5. 4 Ammeter
If you want to measure the current not only
with the UMG but also with the ammeter,
the ammeter must be connected in series to
the UMG.
UMG
I
S2
1
S
A
Einspeisung
Supply
(k)S
1S2(l)
2(L)(K)P1
P
Fig. Circuit diagram with additional ammeter connected
in series
Verbraucher
Consumer
The device must then be set as follows:
Primary current:
1000 A + 1000 A = 2000 A
Secondary current: 5 A
UMG
I
S
S2
1
Einspeisung 1
Supply 1
1P1
1S1
(K)
(k)
(l)
(L)
1S
1P2
Verbraucher A
Consumer A
2
P1
1S1 1S22S1 2S2
Fig. Example of voltage measurement via a total current
transformer
P2
Einspeisung 2
Supply 2
2S1
(k)
(l)
2S2
Verbraucher B
Consumer B
2P
(K)
(L)
2P2
1
26
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