DC Thermal Stability Tester for SPD

Function of control system

• AC power source controlled by computer is adopted, automatic regulate the voltage (through RS232);
• PLC controls the electric voltage regulator and adjust the current;
• Automatic control with analyzing software, continuously monitor the running condition;
• Alarming if the temperature reaches over the set value;
• Indication of over current;
• With Japan made Mitsubishi PLC, Schneider relays and switches, Dell computer screen and Advantech industrial computer.

Function of measurement system

• It can set the test parameters, current value through the software;
• Automatically record the test time, test current, voltage and temperature, save the test data;
• The computer will show the curve of test time, test current, test voltage and temperature.
• With Omega thermocouple;
• RS232 communication, with 8 K series measuring channels, can continuously monitor the temperature;
• Export excel test report automatically;
• The curve can be saved as bmp format;
• The test data can be automatically saved according to test time.

The thermal stability tester is applicable for the thermal stability test of SPDs. It is for indoor operation. One DC power source with a constant current between 2mA ~5A is applied on the SPD. The current through the SPD and the surface temperature of the SPD are continuously monitored to check if it reaches thermal equilibrium, and the disconnectors act.

• Requirement of input power: L1-L2, AC220V, 60Hz, 18kVA;
• Output AC voltage: maximum DC 3500V with measuring accuracy of ±10%;
• Output current: maximum 5A with measuring accuracy of ±10%;
• Voltage and current measurement: RMS;
• Voltage waveform: AC sine wave, waveform distortion rate less than 5%;
• Current adjustment range for AC:2mA~5A (4 ranges: 2~10mA, 10mA~100mA, 100mA~1A, 1A~5A);
• Operation time: more than 15 minutes @ maximum output current;
• Temperature measurement range: 0~200℃, measuring accuracy is ±1℃;
• Temperature measurement: 8 channels (K series), Omega thermocouple;
• Dimension of the control cabinet is W*D*H=1200*900*1700mm, weight is about 300kgs;

IEC61643-21 Low voltage surge protective devices-Part 21: surge protective devices connected to telecommunications and signalling networks-Performance requirements and testing methods