Full-automatic SPD (Surge Protective Device) thermal stabilizer based on FPGA (Field Programmable Gate Array) control and a testing method thereof

Abstract

The invention discloses a full-automatic SPD (Surge Protective Device) thermal stabilizer based on FPGA (Field Programmable Gate Array) control and a testing method thereof, wherein the which the full-automatic SPD thermal stabilizer comprises an overcurrent protector, an alternating current contactor, a variable-frequency power source, a measurement and control system, a step-up transformer, a range switch, a sampling resistor and a voltage-dividing capacitor, and the measurement and control system is composed of a host computer, a temperature collector, an FPGA, an AD (Analog to Digital) converter, an external clock and a DA (Digital to Analog) converter, and is a system based on the FPGA. An actually measured value is compared with a setting valve through the FPGA, and simultaneously, current waveform data are processed by utilizing an over-sampling and software filter technology to automatically adjust a voltage control port of the variable-frequency power source so that loop current reaches the setting value. The collected sample temperature is transmitted to the host computer through a communication interface of the temperature collector to provide constant alternating current, which changes according to a flow, to thermal stability test. Simultaneously, the voltage, the current and the temperature of the SPD can be monitored and the sample eligibility can be automatically judged according to the collected data and motion condition of a disconnector so that the efficiency of the thermal stability test is greatly improved and a higher application value is achieved.

Description

technical field [0001] The invention relates to a test device for thermal stability test of a surge protector (hereinafter referred to as SPD), in particular to a full-automatic SPD thermal stability instrument based on FPGA control. Background technique [0002] With the improvement of the quality requirements for lightning protection projects, the quality and safety of surge protective devices (SPDs) are getting more and more attention. In the process of use, SPD should not only play a good role in lightning protection, but also avoid fire hazards caused by its own quality problems. Connect the SPD to the power line in parallel. When the power supply voltage fluctuates or is overvoltage for a long time, a large leakage current will flow through the SPD module, which will generate quite high heat, and even smoke and fire may spread, causing power failure. Serious accidents such as system breakdown or fire. The thermal stability test is a test to simulate the thermal stabi...

AI Technical Summary

Problems solved by technology

Then it is time-consuming to judge whether it is qualified according to the action of the SPD disconnector, the surface temperature of the SPD or the burning trace, and the phenomenon of component ejection.

[0004] After searching the existing thermal stability test technology, it is found that although the current domestic thermal stability instrument can provide the standard current for the test, but the equipment is manually operated and controlled, it is easily affected by human factors in the qualification judgment, and there are Low test efficiency, insufficient current stability, poor objectivity of judgment, etc.

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