Janitza 333 mV Low Power Current transformers Instruction Manual
- June 13, 2024
- janitza
Table of Contents
Installation manual
for “../333 mV” Low Power Current transformers
Examples low power current transformers
GENERAL
Disclaimer
Compliance with the usage information for the devices is a prerequisite for
safe operation and attaining the stated performance characteristics and
product features. Janitza electronics GmbH assumes no liability for bodily
injury, material damage or financial losses which result from disregard of the
usage information. Ensure that the usage information for the products is
legible and accessible.
Copyright notice
© 2023 – Janitza electronics GmbH – Lahnau. All rights reserved.
Any reproduction, processing, distribution or other use of this usage
information, in whole or in part, is prohibited.
All trademarks and the rights arising from them are the property of the
respective owners of these rights. Subject to technical alterations.
First make sure you have read and understood the usage information
accompanying the product.
Keep the usage information associated with the product available for the
entire service life and pass it on to any possible subsequent users.
Find out about device revisions and the associated modifications of the usage
information associated with your product at
www.janitza.de.
Disposal
Before sending defective devices, modules or components back to the
manufacturer for testing:
- Contact the manufacturer’s Support department.
- Send devices, modules or components complete with all accessories.
- When doing so, please bear the terms for transportation in mind.
INFORMATION
Please return defective or damaged devices / components to Janitza electronics
GmbH, taking into account the shipping regulations for air freight and road
(complete with accessories).Do not attempt to open or repair the device (the
component) on your own because otherwise all warranty claims become invalid!
For the disposal of the device/component, please observe national regulations!
Dispose of individual parts, as applicable, depending on their composition and
existing country-specific regulations, e.g. as
- Electronic waste,
- Batteries and rechargeable batteries,
- Plastics,
- Metals.
Engage a certified disposal company to handle scrapping as needed
Incoming goods inspection
The prerequisites for trouble-free and safe operation of the devices and their
components include proper transport, storage, setup and assembly, as well as
proper operation and maintenance.
Exercise due caution when unpacking and packing the device, do not use force
and only use suitable tools.
Check:
- Visually inspect the devices and components for flawless mechanical condition.
- Check the scope of delivery for completeness before you begin installing your devices and components.
If it must be assumed that safe operation is no longer possible, immediately
put the device with components out of service and secure against unintentional
startup.
It can be assumed that safe operation is no longer possible, for example, if
the device with components:
- Has visible damage,
- No longer functions despite an intact power supply.
- Was subjected to extended periods of unfavorable conditions (e.g. storage outside of the permissible climate thresholds without adjustment to the room climate, condensation, etc.) or transport stress (e.g. falling from an elevated position, even without visible external damage, etc.).
SAFETY
Be certain to read and understand the documents associated with this device and its components before using it. The following safety information provides an overview of safety measures required for the operation of the device and its components. Please bserve the safety information and warning notices to ensure your personal safety and avoid material damage. Special operating conditions can require additional measures! Please also observe the special safety information that is listed in the respective documents on the devices and their components. Documentation associated with the product can be found on our website at [**www.janitza.de
Support>Downloads**](http://www.janitza.de>Support>Downloads).
Electrically qualified personnel
To avoid bodily injury and material damage, only electrically qualified personnel are permitted to work on the devices and their components, assemblies, systems and current circuits who have knowledge of:
- the national and international accident prevention regulations,
- Safety technology standards.
- Installation, commissioning, operation, disconnection, grounding and marking of electrical equipment.
- the requirements concerning personal protective equipment.
Electrically qualified persons within the scope of the technical safety
information of all documents associated with the device and its components are
persons who can furnish proof of qualification as an electrically skilled
person.
Intended use
The devices and their components are:
- Intended for installation in switchboard cabinets and small distribution boards.
- not intended for installation in vehicles! Use of the devices and their components in non-stationary equipment constitutes an exceptional environmental condition and is only permissible by special agreement.
- not intended for installation in environments with harmful oils, acids, alkalis, gases, vapors, dusts, radiation, etc.
Safe and trouble-free operation of the devices and their components
presupposes proper transport, proper storage, set-up and assembly as well as
operation and maintenance in addition to compliance with the safety
information and warning notices. Further safety information can be found on
our website at
www.janitza.de>Support>Downloads.
Safety information
The installation manual does not represent a complete set of all safety
measures required for the operation of the device. Special operating
conditions can require additional measures. The installation manual contains
information which must be observed to ensure your personal safety and avoid
material damage. Symbols used on the device:
| The additional symbol on the device itself indicates an electrical danger
that can result in serious injuries or death.
---|---
| This general warning symbol draws attention to a possible risk of injury. Be
certain to observe all of the information listed under this symbol in order to
avoidpossible injury or even death.
Safety information in the installation manual is marked by a warning triangle
and, depending on the level of danger, is displayed as follows:
DANGER
Warns of an imminent danger which, if not avoided, results in serious or fatal
injury.
WARNING
Warns of a potentially hazardous situation which, if not avoided, could result
in serious injury or death.
CAUTION
Warns of an immediately hazardous situation which, if not avoided, can result
in minor or moderate injury.
ATTENTION
Warns of an immediately hazardous situation which, if not avoided, can result
in material or environmental damage.
INFORMATION
Indicates procedures in which there is no hazard of personal injury or
material damage.
Safety measures
When operating electrical equipment and its components, certain parts are
inevitably under dangerous voltage. Consequently, severe bodily injury or
material damage can occur if they are not handled properly:
- Hazardous voltages can be present in all circuitry parts that are connected to the power supply.
- Do not exceed the limit values specified on the rating plate! This must also be observed during testing and commissioning!
- Observe the safety information and warning notices in the usage information associated with the device and its components!
WARNING
Hazard due to disregard of warning notices and safety information! Disregard
of the warnings and safety information on the device itself and in the usage
information for the device and its components can lead to injuries or even
death! Observe the safety and warning notices on the device itself and in the
usage information associated with the devices and their components.
WARNING
Risk of injury due to electrical voltage! Severe bodily injury or death
can result! Therefore please abide by the following:
- Switch off your installation before commencing work! Secure it against being switched on! Check to be sure it is de-energized! Ground and short circuit! Cover or block off adjacent live parts!
- During operation and troubleshooting (especially for DIN rail devices), check your system for dangerous voltages and switch these off if necessary!
- Wear protective clothing and protective equipment in accordance with applicable guidelines when working on electrical systems!
- Before making connections to the device/the component, ground the device by means of the ground wire connection, if present.
- Do not touching bare or stripped leads that are energized! Equip stranded conductors withwire ferrules! ·
- Hazardous voltages can be present in all circuitry parts that are connected to the power supply.
- Protect your wiring, cables and devices with a suitable line circuit breaker/fuse (for dimensioning, see the documentation for the device)!
- Never switch off, remove or tamper with safetydevices!
- There can still be hazardous voltages present in the device or in the component even after it has been disconnected from the supply volta ge (capacitor storage).
- Only connect screw terminals with the same number of poles and design!
- Do not exceed the limit values specified in the user manual and on the rating plate; this must also be observed during testing and commissioning.
- Take note of the safety and warning notices in the documents that belong to the device!
Safety information for handling current transformers The field of transformer
technology groups the totality of all devices that perform the function of a
current, voltage or measuring transformer together as sensors. In the usage
information for our devices, odules and components, the terms current
transformer, voltage transformer or transformer all refer to sensors.
A further distinction is drawn between the terms current transformer (CT) and
low-power current transformer (LP-CT) :
The term “current transformer” is used for special transformers for the
primary-proportional conversion of currents of large magnitudes to directly
measurable, smaller current values. In contrast, the term “LP current
transformer” is used for special transformers for the primary-proportional
conversion of currents of large magnitudes to directly measurable, lower
voltage values (low power). Current transformers and LP current transformers
provide safe galvanic isolation between the primary circuit and the
measurement circuit due to their design and their physical operating
principle. For Janitza measurement devices, modules and components, use only
“transformers for measuring purposes” which are suitable for the energy
monitoring of your system! bserve the corresponding warning notices.
This manual only describes the handling of current transformers for the
primary-proportional conver- sion of currents of large magnitudes to directly
measurable, lower voltage values (low power).
WARNING
Risk of injury due to large currents and high electrical voltage on the
current transformers! Improper installation can result in serious bodily
injury or death.
- Only use current transformers with continuous double insulation according to IEC 61010-1:2010 to mains or measuring circuits!
- Make sure that the connection for the current transformer connection on the device is adequately tightened!
- Comply with the information and provisions in the documentation of your current transformers!
BRIEF DESCRIPTION
A low-power current transformer (LP current transformer) is a device for measuring purposes, for generating a measured voltage that is reduced as proportionally as possible to the current within the measuring range for current measuring devices, energy meters or universal measurement devices. Transformers of this type protect themselves and the connected measurement devices in the event of overcurrent by going into saturation.
The transformers are available in two designs:
- Feedthrough current transformers (plug-in current transformers)
- Split-core transformers (separable or folding-type transformers)
Principle of operation
- A proportional conversion of currents of large magnitude to directly measurable, lower voltages takes place, i.e. a primary measured variable is adapted to suit the nominal input values of connected measurement devices.
- A low-power current transformer outputs a low voltage as an output signal.
- Due to the principle of the current transformer, there is a safe galvanic isolation between the primary circuit and the measurement circuit.
- Additional protection of the secondary circuit against excessive currents is ensured due to the physically induced saturation phenomenon of the core material.
Ratio
- The ratio is described by the quotient of primary rated current to secondary rated voltage.
- The ratio can be found on the rating plate.
Measuring accuracy
Current transformers are divided into classes according to their accuracy. The
accuracy classes of current transformers are related to the measured value.
Technical data
For technical data, please refer to the rating plate of the current
transformer. Here you will find, for example, information about the ratio.
We recommend a cross section of at least 24 AWG / 0.25 mm² for the connecting
cable.
The cable length of 5 m should not be exceeded.
INFORMATION
Further information can be found on our website in the download area at
www.janitza.de.
MOUNTING & INSTALLATION
WARNING
Risk of injury due to high currents and high electrical voltages!
Severe bodily injury or death can result from:
-
Touching bare or stripped leads that are energized.
-
Device inputs that pose a hazard when touched.
Therefore, please note for your system: -
Disconnect the supply of power before starting work!
-
Secure it against being switched on!
-
Check to be sure it is de-energized!
-
Ground and short circuit! Use the ground connection points with the ground symbol for grounding!
-
Cover or block off adjacent live parts!
WARNING
For assembly and installation, also observe the „SAFETY“ on page 11 to 13!
Ensure there is a safe working environment during assembly, maintenance and
installation work.
- Disconnect the power supply of the primary conductor and secure it against unintentional reconnection.
- Guide the primary conductor through the current transformer in such a way that ensures the direction of the energy flow is from P1 to P2.
- Fasten the current transformer directly to the primary conductor using appropriate fastening material.
- Connect the secondary side S1 and S2 of the current transformer to the meter according to the installation manual of the meter.
- If the current transformer has a grounding point, ground the secondary side of the current transformer. According to DIN EN 61869, current transformers with a series voltage of 3.6 kV and higher must be secondary-grounded. For low voltages, you can omit grounding.
- When configuring the measurement device, enter the transformer ratio of the current transformer that is used.
ATTENTION
Material damage due to disregard of the installation instructions!
Disregard of the installation instructions can damage or destroy your device.
Provide adequate air circulation in your installation environment and cooling,
as needed, when the ambient temperatures are high.
INFORMATION
Connecting cables of the low-power current transformers should not exceed a
total length of 5 m. Extensions can influence the measurement result.
WARNING
Damage to the device/module or your installation even including life-
threatening injuries due to a short circuit. Insufficient insulation of the
equipment (LP current transformers) at the current measurement inputs with
respect to the circuits can lead to life-threatening voltages or damage to
your device, module or system. · Observe the information and specifications
for your LP current transformer concerning insulation and ensure end-to-end
double insulation of your LP current transformers to mains and measuring
circuits!
INSTALLATION DIRECTION
The connections of the primary winding are marked with P1 (K) and P2 (L) and the connections of the secondary winding are marked with S1 (k) and S2 (l).
Energy flow direction
The installation direction of all current transformers (L1 to L4) is important
for the correct measurement of all currents. If you swap the connections of
the current transformers on the primary or secondary side, you will get
incorrect power values. This also applies to the neutral conductor. The cur-
rent transformer must have the same orientation as those of the phase
conductors (see “Setup example for current measurement L1, L2, L3 and N”). If
a uniform alignment is in place, you will obtain a current of 0 A as the
summation current (calculated residual current Sum L1 to L4) of all measured
conductors in an ideal system. Deviating currents indicate either residual
currents or measurement inaccuracies.
INFORMATION
Please refer to the data sheet for the color assignment of the connecting
cable.
Setup example for current measurement L1, L2, L3 and N
Connection example “Current measurement via low-power current transformer” at module 800-CT8-LP.
EXAMPLES
Split-core current transformer
Example: Fastening the primary conductor with cable ties
ATTENTION
In the case of current transformers where the metallic transformer core is
openly accessible:
- Do not touch the contact surfaces of the transformer core with your hand as they may be damaged by the acid mantle of the skin.
- Make sure that no dust is deposited on the contact surfaces.
DISMOUNTING
Prepare the dismounting of the transformer in accordance with the following
warning:
WARNING
Risk of injury due to high currents and high electrical voltages!
Severe bodily injury or death can result from:
-
Touching bare or stripped leads that are energized.
-
Device inputs that pose a hazard when touched.
Therefore, please note for your system: -
Disconnect the supply of power before starting work!
-
Secure it against being switched on!
-
Check to be sure it is de-energized!
-
Ground and short circuit! Use the ground connec- tion points with the ground symbol for grounding!
-
Cover or block off adjacent live parts!
Perform the following steps to dismount the transformer:
-
Loosen the mounting fastenings of the transformer as needed.
-
– for split-core current transformers: Open the transformer and remove the primary conductor from the transformer.
– for feedthrough current transformers: Disconnect the primary conductor at a suitable location and pull it through the transformer. -
Disconnect the test leads from the transformer on the meter.
-
Remove the transformer from the system.
Smart Energy & Power Quality Solutions
Janitza electronics GmbH
Vor dem Polstück 6
35633 Lahnau | Germany
Support Tel. +49 6441 9642-22
info@janitza.com
www.janitza.com
Documents / Resources
|
Janitza 333 mV Low Power Current
transformers
[pdf] Instruction Manual
333 mV Low Power Current transformers, 333 mV, Low Power Current transformers,
Power Current transformers, Current transformers
---|---
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>