The variable frequency series resonance tester can meet the requirements of the field test high pressure system well and has the following advantages:
(1) The test power supply has a small capacity, which reduces the constraints on the field test due to the lack of power supply capacity;
(2) The test device is small in size, and the reactor adopts multi-stage or stacking structure, which is convenient for transportation and on-site installation;
(3) Test wiring is convenient, operation is simple, test time is greatly shortened; cable fault tester
(4) High safety and reliability, the distortion of the output waveforms of the IGBT and drive circuit used in the frequency conversion device is small, and the frequency output stability is good;
(5) It has good IGBT, over-current, over-voltage and discharge protection functions, and can protect equipment and personal safety. If a breakdown occurs during the withstand voltage, the output current of the power supply will automatically decrease as the circuit loses its resonant condition. The voltage at both ends of the product suddenly drops, no overvoltage will be generated, and the discharge energy is small, so it will not cause great harm to the test device and the test sample;
(6) The equivalence of the test is good. Using an AC voltage close to the power frequency (30-300 Hz) as the test power supply, it is very close to the 50 Hz/60 Hz power frequency power supply both in terms of equivalence and consistency. Guaranteed the authenticity and reliability of the test results.
1 PCB Screw Terminal Block 2 Plug-in Terminal Block 3 PCB Spring Terminal Block 4 Barrier Terminal Block 5 Feed Through Terminal Block.
Terminal block consists of fixed terminal block (hereinafter referred to as socket) and free terminal block (hereinafter referred to as plug). The socket is fixed on the electric parts through its square (round) plate (welding method is also adopted for some), the plug is generally connected with the cable, and the plug and socket are connected by connecting nuts.
The terminal block consists of three basic units: shell, insulator and contact body.
Strictly speaking, terminal block refers to a solid device composed of an insulating base and more than one live part. Each conductive member can be used as a joint point for connecting two or more conductors (wires), and also as a tool for connecting or not connecting conductors (wires) individually. In the literal sense, the terminal block can be thought of as a wiring platform providing terminal or wire connection. The terminal block can be a combination type or a single-piece design. The combined terminal block is stacked in the way similar to the block combination, and the two ends are added with side covers and locked and fixed with screws. As for the single terminal block, the combination process mentioned above is not necessary, and it can be used alone.
Terminal Block Series
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