Current Transformer Testers

APPLICATION AND BRIEF DESCRIPTION

The CTS-1 test system is designed for a precise verification of the basic parameters – turns ratio and phase shift angle – of all types current transformers according to the requirements in IEC 44-1/1996 standard. The system is offered in modules, which can be fixed on a carriage; this enables the measurements to be carried out as well in a laboratory as on site. The modules are provided in versions up to 1200 A (CTS-1/1000)
and up to 2400 A (CTS- 1/2000).

By means of the CTS-1 system, demagnetization of the current transformer, loading at different cos φ and S (apparent power), measurement and indication of the Z-burden values, etc., can be carried out. The system operates in manual mode, or under computer control via RS 232. When controlled by computer, a fully automatic mode of operation with preliminarily given parameters can be achieved.

The CTS-1 test system consists of four basic modules:

Programmable current source up to 1200 A (2400 A)
Precision measurement instrument (class 0.04) for current transformer parameters
Compensated standard current transformer with sub-ranges
Z-burden – for loading at powers from 1 VA to 60 VA, cos φ = 1 and 0.8.

Each system module is an independent device and can be purchased separately.

CTS-1 FUNCTIONAL PERFORMANCES

CTS-1/G1000 and CTS-1/G2000

Current Sources up to 1200 A (2400 A)

The generated current is entered from a keyboard or via RS232
Current range – from 0.1 A to 1200 A (2400 A)
Current transformer demagnetization mode
Indication of the actual values of the input voltage, the generated current and the output power
Idle- and overloading protection provided
Power supply required – 220/230 V, 50/60 Hz, 2000 VA max

CTS-1/S Precision Measurement Instrument for Current Transformer Parameters

Measurement inputs – for the standard current transformer current (CT), for secondary current and voltage of the measured CT.
Keyboard or computer (via RS232) control facilities
“Transformation Ratio” screen: Parameters of the tested CT and the range of the standard CT are entered and r.m.s. values are indicated of primary and secondary current, turns ratio, phase shift angle and the error of the tested CT
“Load Parameters Measurement” screen: Indication of the secondary side apparent power, cos φ, Z-burden, etc., of the tested CT
Measurement errors: ±0.02 % for magnitude, ±0.04 % for transformation ratio and ±0.1' for phase shift angle

Compensated Standard Current Transformer (CTS-1/C)

Terminals for 5 sub-ranges provided
Magnetic core losses compensation
Magnitude guaranteed error: < 0.01%
Phase shift guaranteed error: < 0.2’

Z-burden (CTS-1/Z)

Multi-positional switch-over for the load – 1, 2, 5, 10, 20, 40 and 60 VA
Cos φ switch over – with 1 and 0.8 positions
Switch-over for secondary current 1 A / 5 A