The instrument transformers type CT36-xx.xxX, are designed for indoor use in electric distribution panels, for measuring and protection.
They are designed to be resistant up to 36 kV insulation level, molded in epoxy resin under vacuum. The mounting of transformer inside the panel, is realizing through the base metal plate with four screws.
Product available upon customer request
Ask for an offerCurrent transformers for measuring type CTX-xx.xxX are transformers of support type, dry, cast in epoxy resin, under vacuum, having the role of both electrical insulation and to ensure mechanical resistance. These are intended for indoor users, for measurement and protection, in medium voltage cells and substations, for insulation levels from 3.6 / 10/40 kV to 24/50 / 125 kV.
The value of the secondary nominal currents is 5 A or 1 A, there is also the possibility to be combined. The accuracy classes of the measuring secondary can also be 0.2S, 0.2, 0.5S, 0.5, 1, 3, and for the protective secondary they are 5P and 10P. For measuring secondary, the required accuracy class is guaranteed in the range of 25% - 100% of the nominal load, and for protection secondary the accuracy class is guaranteed at 100% of the nominal load.
The working limit current of these transformers is 120% of the rated current. Upon request, the value of this current can be exceeded by an agreement between the manufacturer and the beneficiary, for example 200% of the rated current.
Transformers are designed with the possibility of being reconnected in primary or secondary.
The number of secondary windings can be from 1 to 6, depending on the accuracy class, power and the nominal primary thermal current.
Mandatory, one terminal of each secondary winding must be connected to earth, and unused secondary windings are short-circuited and also connected to ground.
The connections to the secondary windings are made inside a terminal box, provided with a sealable transparent cover and supports for cable glands, type PG16.
The primary windings of CTX-xx.xxX type transformers are built with one or more turns. The primary winding can be simple - with a single transformation ratio or reconnectable - with two transformation ratios. The reconnection in the primary circuit is made with the help of two brass tiles which are mounted with the help of M8 screws with hexagonal head. Changing the transformation ratio for this type of transformer is done without the need to disassemble the transformer connection beers in the circuit.
The secondary windings are made on magnetic cores with oriented grains, made of different alloys, depending on the accuracy class required. These transformers can also be reconnected in the secondary, the reconnection being done by changing the cable from terminal S2 to terminal S3.
Transformers can be mounted in any position. Fixing the transformers is done with the help of four screws in the holes provided in their motherboard.
The transformers are delivered with all the screws and accessories necessary for the connection in the circuit
The connection to the ground will be made with an M8 screw, provided on the metal fixing sole.
Transformers are designed, made and tested according to standards IEC 61869-1, IEC 61869-2.
The shape and dimensions of some transformers are according to DIN 42600-8
Metrological verification bulletins can be issued upon request.
For parameters that are not specified in this documentation, we expect you to contact us by e-mail or telephone.
Highest voltage for equipment: 3.6; 7.2; 12 kV
Test with applied voltage 50 Hz - 1 min; 10; 20; 28 kV
Lightning pulse test - 1.2 / 50 µs: 40; 60; 75 kV
Primary rated current - In: 5 ÷ 3200 A
Possibility of reconnection in the mayor: YES
Secondary rated current - Is: 5 and / or 1 A
Possibility of reconnection in secondary: YES
Frequency: 50 Hz
Thermal current - Ith: 0.5 ÷ 100 kA
Dynamic current - Idyn: 2.5 x Ith
Rated thermal current - Icth: 1.2 x In
Secondary winding power: 1 ÷ 60 VA
Accuracy class secondary winding measurement: 0.2S; 0.2; 0.5S; 0.5; 1; 3 %
Security factor - FS: 5; 10; 15
Accuracy class secondary winding protection: 5P; 10P
Accuracy limit factor - ALF: 5; 10; 15; 20; 25; 30
Insulation class: E
Altitude: maximum 1000 m.
Ambient working temperature: - 5… + 40 ° C.
Storage transport temperature: - 25… + 40 ° C.
Force in the console on the primary terminals: 5 kN
Standards: IEC 61869-1: IEC 61869-2; DIN 42600-8
Current transformers for measuring type CTX-1x.xxX, executed and supplied with a primary winding (P1-P2), with barriers (B) or without barriers (N), may have one or more secondary windings (1S1-1S2, 2S1-2S2,…).
Terminals “S2” of all secondary windings, must be connected to ground.
Attention! The product is delivered with secondary windings with shorted start and end terminals.
When only one secondary winding is used, but the second secondary winding is not used in the load, the start and end terminals of the unused secondary winding must be short-circuited and connected to ground. When it is desired to use the secondary in this situation, the starting terminal of the winding must be disconnected from the ground, following the diagram below.
type CTX-2x.xxX
Current transformers for measuring type CTX-2x.xxX, executed and supplied with two reconnectable primary windings (P1-C2; C1-P2), with barriers (B) or without barriers (N), may have one or more secondary windings (1S1-1S2, 2S1-2S2,…) .
The primary windings can be connected as follows:
Series - connect C1 with C2, for primary current 1 x Ip
Parallel - connect P1 with C1 and P2 with C2, for primary current 2 x Ip
Terminals “S2” of all secondary windings, must be connected to ground.
Attention! The product is delivered with secondary windings with shorted start and end terminals.
When only one secondary winding is used, but the second secondary winding is not used in the load, the start and end terminals of the unused secondary winding must be short-circuited and connected to ground. When it is desired to use the secondary in this situation, the starting terminal of the winding must be disconnected from the ground, following the diagram below.
type CTX-3x.xxX
Current transformers for measuring type CTX-3x.xxX, executed and supplied with a primary winding (P1-P2), with barriers (B) or without barriers (N), may have one or more reconnectable secondary windings (1S1-1S2-1S3, 2S1-2S2-2S3,…) .
Secondary windings can be connected as follows:
Great report - 1S1-1S3 is connected and 1S2 remains unconnected for 2 x Ip
Small ratio - 1S1-1S2 is connected and 1S3 remains unconnected, for 1 x Ip
Terminals “S1” of all secondary windings, must be connected to ground.
Attention! The product is delivered with secondary windings with shorted start and end terminals.
When only one secondary winding is used, but the second secondary winding is not used in the load, the start and end terminals of the unused secondary winding must be short-circuited and connected to ground. When it is desired to use the secondary in this situation, the starting terminal of the winding must be disconnected from the ground, following the diagram below.
Permissible force limit for tightening screws:
M 4 = 0,8 …1,2 Nm
M 5 = 2,8 … 3,5 Nm
M 8 = 16 … 20 Nm
M 12 = 40 … 50 Nm
Instructions for handling, transport, storage and commissioning
of current transformers for measurement, type CTX-xx.xxX
Manipulation:
Type transformers CTX-xx.xxX they are heavy objects in relation to their volume. Therefore, the handling and transport of such products will be done with care, so as not to cause injuries to the body of the maneuverer of any kind. The rules of labor protection regarding the handling of heavy objects will be strictly observed. Direct contact with the ground of the transformers will be avoided, especially in conditions of high humidity.
Transport:
Transportation of type transformers CTX-xx.xxX it will be done in normal atmospheric conditions, avoiding contact with atmospheric precipitation and following the special specifications ("avoid rain", "attention to fragile object", "no overlaying", etc.) marked by a label on transformer package, where applicable.
Storage conditions:
Storage of type transformers CTX-xx.xxX it will be done in closed spaces with environments free of humidity, highly corrosive substances, chemically active substances, flammable or explosive vapors and without electrically conductive dusts.
Putting into service:
At the time of commissioning of the type transformers CTX-xx.xxX, their location in a space that respects the ambient temperature level will be considered in order to be included in the insulation class in which they were made, elements that are specified on the product label.
When commissioning, the corresponding circuit connection must be observed, in accordance with the markings on the transformer terminals and the connection instructions for these types of transformers. Only multi-wire (corded) cables or connecting rods, the section of which corresponds to the rated current specified on the product label, electric slippers of appropriate dimensions, with the insulation distance on the surface between the slippers, etc., shall be used.
Information available on request
Information available on request
