Hardware Composition of HYG-103 Microcomputer Relay Protection Tester
Microcomputer for Controlling Digital Signal Processor
In this device, a high-speed and high-performance digital control processor is used as the control computer. In software, a double-precision algorithm is used to generate arbitrary high-precision waveforms of each phase. Because of the integrated structure, each part is closely integrated, the data transmission distance is short and the structure is compact. It overcomes the problem that the number of output waveform points in the notebook computer direct control measurement and control instrument is small due to the long data communication line and narrow frequency band.
D/A Conversion and Low Pass Filtering
High-speed high-bit D/A converter ensures the accuracy and linearity of current and voltage in the whole range.
Because of the high resolution and fitting density of D/A, the distortion of waveform is small and the harmonic component is small, the requirement of low-pass filter is very low, so it has good transient characteristics, phase-frequency characteristics and amplitude-frequency characteristics. It is easy to achieve accurate phase shift and harmonic superposition, and high accuracy can be guaranteed at high frequency.
Voltage and Current Amplifiers
The current and voltage of each phase do not use up-current or booster, but use direct output mode, so that the current and voltage sources can directly output waveforms from DC to various frequency components, such as square wave, combined waveforms of each harmonic superposition, fault transient waveforms, etc., which can better simulate the current and voltage characteristics of various short-circuit faults.
Power amplifier circuit uses imported high-power and high-fidelity modular power devices as power output stage, combined with carefully and reasonably designed heat dissipation structure, it has enough power redundancy and thermal capacity. The power amplifier circuit has complete overheating, overcurrent, overvoltage and short circuit protection. When the current circuit is over-current and the voltage circuit is overloaded or short-circuit, the output power is automatically limited, the whole power amplifier circuit is turned off, and the alarm signal is displayed. In order to prevent overheating of power amplifier circuit caused by long-term operation under high current, the software time limit under high current is set. When the current exceeds 10A, the software starts within a time limit. When the time limit arrives, the software automatically turns off the power output and gives warning instructions. The larger the output current, the shorter the time limit.
Open-in and open-out volume
Switch input circuit can be compatible with empty contacts and 0-250V potential contacts. In the potential mode, 0-6V is combined and 11-250V is fraction. The switching quantity can conveniently measure the action time and action time difference of each phase switch contacts.
The open part is isolated from the main working power supply and power discharge power supply. The open ground is suspended ground, so the open part of the common terminal is not connected with the current, voltage part of the common terminal UN, IN, etc.
The input of switching potential is directional. The positive end of the common terminal potential should be turned into the negative end of the terminal potential to ensure that the potential of the common terminal is higher than that of the open terminal. In the field connection, the public terminal + KM and the negative terminal should be opened into the terminal. If it is reversed, it will not be able to detect correctly.
The open part is the output of the relay empty contacts. The output capacity is DC:220V/0.2A, AC:220V/0.5A. Switch output is completely isolated from voltage, current, on-off and other parts. The action process of each output is different in each test module. Please refer to the software operation instructions of each module in detail.
The following are two common wiring diagrams of outgoing volume:
Potential contact time
Empty contact time
LCD Display and Rotating Mouse Operation
The device uses 320 x 240 dot matrix high resolution blue backlight liquid crystal display as display. The whole process of the test and the results of the test are displayed on the display screen. The whole set of Chinese character operation interface is clear and beautiful. The operation control is carried out by a rotating mouse and two keys. All data and the test process are set by a rotating mouse on the display screen. It is easy to operate and master.
Baseboard of relay protection tester
The relay protection tester is equipped with an adjustable DC power supply output on the chassis floor, which is divided into 110V and 220V. It can be used as auxiliary power supply for field test. The maximum output current of the power supply can reach 1.5A. A cooling fan, a power outlet, a ground terminal and three insurance are installed on the bottom plate. One of the three insurance is auxiliary DC power supply insurance (2A/250V), and the other is voltage circuit insurance (2A/250V).
