HCL2688 Transformer Short-Circuit Impedance Tester

1. Product Overview

Short circuit impedance is one of the important parameters of transformer. Short-circuit impedance method is a traditional way to judge winding deformation in accordance with IEC60076 -5:2000 standards. Short circuit reactance variation is the only criterion of judging if there is the deformation of transformer winding or not.

2. Function Characteristics

Measure transformer’s short-circuit impedance, short-circuit reactance, three-phase impedance voltage;

Show each test parameters such as voltage, current, power, and frequency;

Use only single-phase 220 v ac power to complete measurement, in the absence of ac power, can use small power UPS power supply (on-line 500 va);

Testing power supply can choose external and internal power supply.  The internal power supply is the working power of instrument and external power supply can be imputed by the regulator;

Simple and convenient wiring and operation, one-time connection and startup then it can automatically complete Three-phase measurement and direct display measurement results;

Internal automatic control when using internal power output voltage and output current, without any external auxiliary equipment;

Automatic frequency calibration, eliminating the error caused by the frequency fluctuation;

Can store thousands times of measurement results. The instrument is built-in electric memory, which can be long-term preservation measured data;

Large-screen LCD display

Intuitive and convenient;

With function of electric clock and calendar

3. Technical parameters

Voltage measuring  range: 20 v ~ 400 v

Current: 0.5 A ~ 10 A

Accuracy:  voltage, current: 0.2

Impedance: 0.5

Power: 0.5 o (cosφ>0.15)

Overall dimensions:  350 mm * 270 mm * 170 mm

Weight: 8kg

4. Using Conditions

Ambient temperature: - 10 ℃ to 50 ℃

Environmental humidity: ≤ 85%

Work power:  AC220V plus or minus 10% (Customized)

Frequency of Power Supply: 50±1Hz or 60±1Hz (Customized)

5. Analysis of common fault of equipment 

6. Instrument Wiring

(1)Single phase measurement:

Connect the instrument panel’s Ua, Ia, Ub and Ib to the X and 0 terminals of the transformer (as shown in figure 1).

(2)Three phase measurement: 

Connect the instrument panel’s Ua, Ia, Ub, Ib, Uc and Ic respectively to the transformer A, B and C terminals (as shown in figure 2). 

If the external power supply is used, the external power supply is added to the external input terminal of the instrument panel.

Enough thick wires are used to short-circuit at the LV side of power transformer; the section area of short circuit should bear the LV rated current. In addition, the contact should be good to decrease the extra error. The grounding terminal of the instrument shall be reliably grounded.