Author: Noyafa–CCTV Tester
What is a three-phase protection tester? The three-phase protection tester is divided into two circuits: the main circuit and the auxiliary circuit. The main circuit is adjusted by a large knob, and the auxiliary circuit is adjusted by a small knob. The main circuit controls its output through the output selection button switch on the panel. What is three-phase protection? tester? The three-phase electric protection tester is divided into two circuits: the main circuit and the auxiliary circuit. The main circuit is adjusted by a large knob, and the auxiliary circuit is adjusted by a small knob.“output selection”The key switch controls various quantities of its output, and the digital volt/ammeter on the instrument can automatically monitor its output value while switching one output. The auxiliary loop directly adjusts the output through the output switch control, and the measurement can be measured with an external multimeter. 1. Embedded host, equipped with ultra-large-scale programmable logic device (CPLD) The host adopts high-speed and high-performance embedded microcomputer system equipped with CPLD, which has fast response speed, wide transmission frequency, and can generate high-density fitting of 500 points per cycle for the fundamental wave. Sine wave, the output waveform is smooth without harmonic components.
Due to the large number of output points and the filter circuit passing through, the distortion of the waveform is extremely small. When the harmonic is output, even for the 9th harmonic and 450Hz, it can reach a high density of 55 points per cycle. The software has very strong man-machine dialogue and online help functions, which can control any test parameters. 2. The 12-channel D/A output of a single machine adopts a 16-bit high-precision DAC chip to ensure high precision and good linearity of the fitted waveform.
It can output 12 analog signals at the same time, which can meet the test of transformer protection and backup power supply. 3. High-precision linear power amplifier, simultaneously outputting 6-phase voltage and 6-phase current The well-designed voltage and current amplifier realizes AC/DC sharing, and the output stage adopts unique high-precision ultra-linear amplification technology. High precision, good reliability, output 6-phase AC voltage and 6-phase AC current at the same time, each phase AC voltage output up to 130V, 70VA, AC current output up to 180A.
DC voltage output can reach 300V, 130VA. 4. Large-screen LCD, complete interface, mainframe integrated single-chassis structure, the machine adopts 640×480 dots 8.0’’Large-screen high-resolution graphic liquid crystal display, the operation interface and test results are displayed in Chinese, and all operation processes are set on the display, which is intuitive and clear. The device can be operated with its own keyboard, and an external keyboard/mouse port is also provided.
It also provides 2 USB ports and 2 RS232 ports, which can communicate with external computers and other devices. Only need AC 220V power supply, it can work when turned on. Easy to carry, very suitable for mobile testing and field work.
5. Auxiliary DC power source (optional) The machine can be equipped with two independent DC power sources, one set of 110VDC/1.0A and the other set of 220VDC/0.6A, which can be automatically output at the same time when turned on, and can be used as a protection power supply without passing the Software settings and adjustments. 6. The intelligent self-protection adopts a newly designed heat dissipation structure to ensure good ventilation. At the same time, it can judge the phenomena that endanger the safety of the device itself, such as overcurrent, overvoltage, overload, short circuit, high temperature, abnormal data, etc. Even the operation error will not damage the device.
In addition, when a dangerous signal such as an external voltage enters the tester through the terminal, the device alarm indicator turns red, and the power amplifier is automatically cut off.
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