KUW Split-Core Current Transformer
Installation Guide
KUW 1/30
KUW 1/40
KUW 2/40
KUW 4/60
KUW 4.2/60
Janitza electronics GmbH
Vor dem Polstück 1
D-35633 Lahnau
Support tel. 0049 6441 9642-22
Fax 0049 6441 9642-30
E-mail: [email protected]
Internet: http://www.janitza.com
Read this installation guide before
installing the product
Technical Specifications
CE marking
LV directive 2006/95/EC RoHS
directive 2011/65/EU
Standard
EN 61010-2-032:2012
WEEE directive 2012/19/EU
Safety and environmental conditions
This product is designed to be safe under the following
conditions:
Location
Altitude
Ambient temperature
Storage temperature
Relative humidity
Pollution degree
Degree of protection
Indoor use
Up to 2000m
KUW 1/30: -5°C .. +40°C
KUW x/40, x/60: -10°C .. +55°C
-20°C .. +70°C
5% .. 85%, non condensing
2
IP20
The KUW is only suitable for insulated primary conductors.
Standard
Rated short-time thermal current
(Ith)
Rated dynamic current (Idyn)
Rated continuous thermal current
(Icth)
Rated insulation level
Rated frequency
Class of insulation
Material (housing)
IEC 61869-2:2012
60 x Ipr / 1s
2,5 x Ith
100%
0,72/3/-kV
50/60Hz
E (120°C)
PA 6.6, UL94: V2
Specifications
KUW
1/30
1/40
2/40
4/60
4.2/60
Suitable for
cable
Ø 18mm Ø 18mm Ø 28mm Ø 42mm
2 x Ø
42mm
../1A
Secondary
leads length
for 0,5mm2
3m
3m
3m
3m
3m
Approximate
weight
200g
360g
310g
450g
650g
../5A
Secondary
leads format
/
0.5 meter
Ø 1.5mm
0.5 meter
Ø 1.5mm
3 meter
Ø 1.5mm
3 meter
Ø 1.5mm
Approximate
weight
/
300g
250g
650g
850g
Specifications per type
Janitza reserves the right to carry out modifications on its
products, in order to improve them, without prior notice.
Safety instruction
All activities for installation, commissioning and maintenance of
this current transformer must be performed by qualified person-
nel that have the knowledge of applicable safety precautions.
This guide assumes that the reader of this document has suf-
ficient electro-technical knowledge to understand the content
of this document.
General
The KUW split-core is a current transformer (CT) and can only
be used for measuring electrical alternating currents. The KUW
is suitable only for mounting on insulated primary conductors in
a weather protected and dry location.
Explanation of symbols
This product is designed according to
the EN-IEC 61010-2-032:2012 standards and
therefore this product meets the requirements of
the Low Voltage Directive 2006/95/EC.
Do not apply around or remove from UNINSULAT-
ED HAZARDOUS LIVE conductors, which may
render electric shock, electric burn, or arc flash.
Read the installation guide before mounting the
product. Unprofessional work activities on electri-
cal installations may result in a threat of danger to
the life and health of human beings and livestock!
Under no circumstances the secondary circuit of
the CT may be opened when the CT is closed
and current is flowing in the primary circuit. High
voltages may appear on the secondary leads
when this circuit is left open.
RoHS Directive 2011/65/EU
Janitza states that they only uses qualified com-
ponents in their products from manufacturers,
whose specifications meet or exceed the require-
ments of the European Directive for the Restric-
tion of use of certain Hazardous Substances.
WEEE Directive 2012/19/EU
The ‚crossed out wheeled bin‘ symbol indicates
that the equipment should not be disposed as
unsorted municipal waste. Contact a qualified re-
cycler for disposal.
c
m
(
H
Always avoid working on live parts of an installation.
Mounting instruction
No special tools are required to install a current transformer (CT)
of the KUW series. To connect the CT to the meter correctly,
please consult the installation guide of the meter.
c
Attention
Do not touch the core surfaces by hand: skin acid may damage
the core. Avoid dust on the core surfaces.
Assembly
Under no circumstances the secondary circuit of the CT may be
opened when the CT is closed and the current is flowing in the
primary circuit. High voltages may appear on the secondary
leads when this circuit is left open.
1. Ensure a safe working area during assembly,
maintenance and inspection of the CT. If necessary, dis-
connect the power of the primary circuit and make sure it
can not be enabled unintentionally.
2. Find the power direction of the cable you want to
measure. It is recommended to mount the P1 side to
power source and the P2 side to power consumer. If the
CT is installed like this, the arrow on the CT will indicate
the direction of the power flow.
3. Open the CT and mount it on the cable by using cable ties.
Attention: Do not close the CT. Otherwise high voltages
may appear on the open secondary leads!
Wiring Diagram
../1A
Brown lead: S1
Blue lead:
S2
../5A
Black lead: S1
Red lead:
S2
P1
P2
S1
S2
primary conductor
Load
Maintenance and inspection
• Check whether the secondary leads are connected firmly.
• Check whether the CT is closed properly.
• Check whether the CT is mounted firmly.
• Remove severe pollution on the casing. Contact with
moisture, especially with the core, must be avoided.
Attention
Do not touch the core surfaces by hand: skin acid may
damage the core.
Temporarily disconnecting the CT
The secondary leads of the CT always have to be connected
to a low impedance burden such as an ammeter. When,
during maintenance, no burden is available to connect to, the
secondary leads of the CT (the two secondary terminals)
must be short-circuited.
Problem solving
e.g. unexpected or incorrect values, reversed power
• Check the settings of the meter by using the installation
guide of the meter.
• Check whether the CT is mounted on the intended cable
in the right direction.
4. Connect the secondary leads (S1, S2) to the low
impedance current input of the measurement instrument
(e.g., an ammeter or current input of kWh-meter).
5. Close the CT only when you are sure that the secondary
leads are connected to the current input of the measure-
ment instrument. The CT is properly closed when you hear
a ‘click’.
6. Enable the primary circuit if necessary.
7. Check if the CT is mounted and closed properly.
Check if the secondary leads are connected properly and
firmly.
• Check if the CT is closed properly.
• Check the value of the secondary burden (secondary leads
length/diameter and meter impendent). See product/data
sheet for the maximum burden value.
• If previous points did not solve the problem:
Check carefully whether there is dust or other pollution
present between the two parts of the core.
In case there is pollution, the core surfaces can be cleaned
with a lint free cloth and then protected with an extremely
thin layer of acid free petroleum jelly (Vaseline).
Attention
Always follow the disassembly instructions when reversing
the CT.
Disassembly instruction
Tools are only required for removing the cable ties of the CT.
1. Ensure a safe working area during disassembling the CT. If
necessary, disconnect the power of the primary circuit and
make sure it can not be enabled unintentionally.
2. Open the CT.
3. Disconnect the secondary leads from the measurement
instrument.
4. Remove the cable ties. Pay attention not to damage the in-
sulation of the primary conductor when removing the cable
ties. Remove the CT.
5. Enable the primary circuit if necessary.
Recycling
When the product has reached ‘end of life’, it must be recy-
cled. Do not dispose this product as unsorted municipal waste.
Contact a qualified recycler for disposal.
Art. no: 33.03.312 Dok.-Nr
. 2.204.010.5