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ShTT-0.95 Current Transformer

Contents:

The ShTT-0.95 current measurement transformers are designed for use in circuits for commercial and technical electricity metering in electrical networks with a nominal voltage up to 0.95 kV.

Design Features

Transformer Design
The ShTT-0.95 current transformer was specifically developed to simplify and accelerate installation in switchgear of various types and technical conditions.

Transformer Secondary Circuits
The ShTT-0.95 current transformer features factory-ready secondary circuits (custom length up to 5 meters). The secondary circuit cable is an integral part of the transformer’s construction and does not require additional connections or sealing on the transformer side. The secondary circuit is terminated with U-shaped cable lugs (optional upon order), simplifying connection to the electricity meter or test terminal block (TTB).

Mounting on Electrical Busbar
The ShTT-0.95 current measurement transformer provides the possibility of installation on an electrical busbar. The ShTT-0.95 kit includes a bushing (bushing dimensions: height 37 mm, diameter 30 mm), which is placed inside the transformer and provides the connection for electrical busbars or between an electrical busbar and a cable lug. Connection is made using an M10 bolt and its associated set of hardware: flat washers, split lock washer, nut (not included in the delivery set). The bushing is fixed inside the transformer.
Technical Specifications
Current Transformer Characteristics
Maximum nominal/operating voltage, kV0.95 / 1.0
Number of secondary windings1
Nominal primary current Inom, A150, 200, 250, 300, 400, 500, 600
Nominal secondary current, A5
Accuracy class per GOST 77460.5S
Nominal safety factor of secondary winding, Kb nom10
Thermal withstand current (1 sec.), A60· Inom
Cross-section of secondary cable cores, mm² (for standard secondary circuit lengths)2.5
Standard secondary cable lengths, m (other lengths agreed with manufacturer)0.5 / 2.0 / 4.0 / 5.0
Nominal secondary load at cos φ = 1, VA* (for corresponding secondary cable length)2.5 / 2.0 / 1.0 / 1.0

* – nominal secondary load at the end of the secondary circuit cable is indicated.

Dimensions (mm)
Compliance with Regulatory Requirements

The ShTT-0.95 current transformers are entered into the State Register of Measuring Instruments (GRSI) under number 57345-14. Calibration interval – 8 years.
The current measurement transformers comply with the requirements of GOST 7746 and TR TS 004/2011.

Application Experience of ShTT-0.95

Installation experience with the ShTT-0.95 has shown that its use reduces the time and quantity of materials required by more than half. The greatest benefit is achieved in old switchgear (minimizing the number of affected switchgear components) or in switchgear with installation space limitations for transformers (due to the transformer’s compactness and mounting method, numerous additional possibilities for its installation arise).

Order Specification

ShTT – 0.95-I-[AAA]/5-0.5S-[L]-[M]

[AAA] – primary current in A: 150, 200, 250, 300, 400, 500, 600;
[L] – length of pre-terminated secondary circuits in m.;
[M] – accessories:
        V – mounting on a bushing (the kit includes an internal bushing and a fastener)

Packaging

The standard packaging is a cardboard box for 9 transformers of the same type, with mounting accessories and datasheets.
Alternative packaging forms or sets are agreed upon when ordering.

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