Current Transformer Testers

APPLICATION AND BRIEF DESCRIPTION

The CTS-1 test system is designed for 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 1000 A (CTS-1/1000) and up to 3000 A (CTS- 1/3000).

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 1000 A (3000 A)
• Precision measurement instrument (class 0.01) 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/G3000

Current Sources up to 1000 A (3000 A)

• The generated current is entered from a keyboard or via RS232
• Current range – from 0.1 A to 1000 A (3000 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
• “Turn Ratio Measurement” Mode
• parameters of the tested CT and the range of the standard CT are entered
• 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” Mode
• indicated are: the secondary side apparent power, cos φ, Zburden, etc., of the tested CT
• Measurement errors: ±0.01 % for magnitude, and ±0.1’ for phase shift angle

CTS-1/C 1000 CTS-1/ C 3000

Compensated Standard Current Transformer

• Terminals for 12 sub-ranges provided
• Magnetic core losses compensation
• Magnitude guaranteed error: < 0.01%
• Phase shift guaranteed error: < 0.2’

CTS-1/Z

Z – burden

• 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 Certificate