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Due to the lack of related technologies for switchgear power-on test benches in China, most of them rely on imports. Therefore, the difference is not obvious from the purchase channels. However, you can choose a product with a relatively high degree of integration. The simpler the hardware structure is, the higher the integration is. The cost may also be higher. Whether the switchgear power-on test bench is produced by itself is an agent product or a branded product, and the user must identify it clearly. The user can identify through clues such as trademarks, random accessories, service commitments, and instrument internal application software. Switchgear Energization Test Bench The grading ring currently used on composite insulators is further divided into two kinds: "open" ring and "closed" ring. The only difference between the two rings is that the open ring has a discharge opening on the ring body. As far as the pressure equalization effect is concerned, there is no significant difference between the two. The open-type pressure-equalizing ring of the switchgear power-on test bench has a strong arc-striking effect due to its high field strength at its opening. When the line generates an overvoltage and the overvoltage value is in a critical state, it promotes its discharge. This shortens the discharge time and protects the surface of the umbrella skirt from electric burns.
Switchgear power-on test bench In some foreign composite insulator manufacturers, the equalizing rings used in conjunction with composite insulators are almost all open-type pressure equalizing rings. In addition, a significant difference between the open ring and the closed ring is that the discharge of the open ring occurs in the direction of the opening, while there is no obvious rule in the closed ring. Some developed countries attach great importance to the protection of insulator surfaces in the operation of transmission lines. Even in some porcelain or glass insulator transmission lines, a “discharge gap†device is designed and installed. The switchgear power-on test bench is in the switchgear power test. A pair of metal rods are correspondingly mounted on a certain side of the insulator string, and the length of the metal rods is determined according to the requirements of the discharge voltage of the wiring. Obviously, the insulator string after installing the “discharge gap†device will have lower discharge voltage than when the device is not installed, but the protection of the insulator surface will be strengthened because once the line is over-voltage discharge, the discharge will inevitably occur in the discharge. The gap does not occur on the insulator surface.
Switch cabinet power test bench output line terminal string in front of 10A, 16A air switch as a short circuit protection. According to the user's special requirements, it is best to have only one set of power output work at a time. Do not mistakenly connect other air switches and cause multiple outputs at the same time. Switchgear power-on test-bed contactor and relay controls require that the “total control power switch†be closed and the “control power supply†be activated, and then close the relay of the corresponding circuit to output the power of each parameter. When switch cabinet power-on test bench needs to switch the four-way output, one of the relays should be opened and disconnected, and then the relay of the other circuit should be closed, otherwise the relay of the next-row relay will refuse to move. Switchgear power-on test bench items are not controlled by contactors and relays, as long as the total control power switch is closed, single-phase AC220V output (fixed value), three-phase AC380V output (fixed value) can be output, through the total control power switch and the respective The air switches are switched on and off, respectively, and are not controlled by contactors and relays.
Switch cabinet power test bench manufacturing process development oriented to diversification
The high-precision, low-temperature-resistance container parts of the switchgear power-on test bench have a very important influence on the instrument performance, especially the stability.