Low-voltage grids are used to supply electricity to consumers at the lowest voltages. Zelisko’s low-voltage current and voltage transformers focus primarily on energy metering applications.
Our high-precision instrument transformers are tested and supplied in compliance with the relevant national energy metering standards (PTB; BEV; ESV; GOST). All our transformers have a completely maintenance-free, dry-type design,
and no recalibration is required at any point in the product life cycle.
Slip-On
Current Transformer
KAS - Series
Current Transformers Upto 6 kV
A completely closed mini current transformer, most appropriate
for use in low-voltage switchboard plants. Core and secondary winding are situated in a black housing of self-extinguishing material. lnsulation class E.
The secondary terminals (double terminal) are placed under a
transparent sealable cover. The transformers are built to allow
official verification and are therefore recommended for account
metering. The transformers are produced according to IEC 61869-0 (other standards on request).
Max. Rated Primary current : 100 – 4000 A
Rated Secondary Current : 1 A; 5 A
Insulation level : 0.72/3 kV; 1.2/6 kV
Standard : IEC 61869-0 (other standards on request).
Wound Primary Type Current Transformer
KLW 3/3 - Series
Current Transformers - Wound Type
A completely closed mini current transformer, most appropriate
for use in low-voltage switchboard plants. Core, secondary and primary windings are situated in a black housing of self-extinguishing material. lnsulation class E. The secondary terminals (double terminal) are placed under a transparent sealable cover. The transformers are built to allow official verification and are therefore recommended for account metering. The transformers are produced according to IEC 61869-2 (other standards on request).
Max. Rated Primary current : 10 – 200 A
Rated Secondary Current : 1 A; 5 A
Insulation level : 0.72/3 kV
Standard : IEC 61869-2 (other standards on request).
SPLIT-CORE
CT TYPE GAE
GAE - Series
Indoor Current Transformers - Split Core
The split-core CT type GAE is a separable current transformer for
indoor application. It is suitable for both, measuring and protection
application and is often used for earth-fault detection
in 3-phase-systems. CT type GAE can be mounted around bus
bars and cables fast and easily. Together with fully insulated cables,
the CTs can be used for medium voltage and high voltage
application.
Max. Rated Primary current : 50 – 1000 A
Rated Secondary Current : 1 A; 5 A
Insulation level : 0.72 / 1.2 kV
Standard : IEC 61869
RING-CORE
TYPE CT
GAR, RK - Series
Indoor Current Transformers - Ring Core
Cable Type Current Transformers Ring-Core. These current
transformers are maintenance-free low-voltage transformers
for indoor application. They comply with various national
and international standards (IEC 61869-2, VDE 0414, ANSI,
GOST etc.). Ring-Core Type: e.g. GAR3, GAR0.5 and RK with Cast Resin. Our ring-core type current transformers can be delivered with
verification in legal metrology for metering purpose.
Max. Rated Primary current : 30A – 10000 A (GAR), 20A – 4000 A (RK)
Rated Secondary Current : 1 A; 5 A
Insulation level : 0.72 / 1.2 kV
Standard : IEC 61869-2, VDE 0414, ANSI,GOST
SLIP-ON TYPE CT
RKO - Series
Indoor Current Transformers - Ring Core
The slip-on Current Transformer type RKO are suitable for both,
measuring and protection application. Due to the modular design
of the casting tools, each model allows a big variety of CT
heights and inner diameters. With this concept, multi-core CTs
can be realized easily. Together with fully insulated cables, the
CTs can be used for medium voltage and high voltage application.
Outdoor design and terminal box with cable gland on request.
The possible sizes and dimensions are shown in the table below
Max. Rated Primary current : 30A – 10000 A
Rated Secondary Current : 1 A; 5 A
Insulation level : 0.72 / 1.2 kV
Standard : IEC 61869
Low Indoor
Voltage Transformer
KTZ - Series
Indoor Voltage Transformers Upto 36 kV
A completely enclosed air-cooled voltage transformer, most appropriate for use in low-voltage switchboard plants.
Primary and secondary windings are arranged in a common
coil form and are covered by two halves of a housing of selfextinguishing material. lnsulation class E. The transformers are produced according to IEC 61869-3 (other standards on request).
Max. Rated Primary Voltage : 50 – 1000 V; 50/√3 – 1000/√3 V
Rated Secondary Voltage : 100 V; 110 V; 100/√3 V; 110/√3 V
Standard : IEC 61869-3 (other standards on request).