Closing busbars include out-of-phase shut-off buss, co-box (including co-box phase isolation) shut-off busbars and cable busbars, which are used for power plants, substations, industrial and civil power supply leads.
Phase-off busbar
1. Usefulness
The out-of-phase shut-off bus is a kind of high-current transmission device applied to the outgoing circuit of generators of 50MW and above and the branch circuit of the factory
2. Features
The out-of-phase closing bus conductor and shell are all made of aluminum plate coil welding, with the following characteristics
1. Reduce the grounding fault, avoid the phase-to-phase short circuit, and the phase-off busbar can eliminate the grounding fault caused by external moisture, dust and foreign objects due to the shell protection, and the bus bar is divided into phases to close and also eradicate the occurrence of interphase short circuit
2. Eliminate the heat of the steel structure, close the phase, close the busbar, and choose the shell shielding, which can fundamentally solve the problem of induced heating of the steel structure
3. Reduce the interphase short-circuit electrodynamic force due to the two-layer shielding effect of eddy current and circulation on the shell, so that the short-circuit electrodynamic force of the interphase conductor is greatly reduced
4. To improve the safety and reliability of operation, the basin insulator of the plant is made of SMC limitation, and then avoid condensation of the insulator after the bus is closed, and at the same time, hydrogen measurement and temperature measurement devices are selected, and the measurement signal can be displayed on the spot or transmitted to the DCS system, and the safety and reliability of the progressive operation of the bus bar is also invented after the bus is closed, and the conditions for the selection of ventilation and cooling are also invented
5. Close the busbar, the factory has a complete set of production quality, operation protection, small workload, simple construction device, and no need to set up a fence, simplifying the requirements for civil engineering
6. The shell is in the same phase, including the branch circuit, the electrically fully connected type is selected, and the multi-point grounding is selected, so that the shell is basically at the equipotential grounding method, which greatly simplifies and eliminates the risk of personal electric shock
7. The insulation level of the out-of-phase closed bus produced by our factory is higher than that of China's national standard GB/T8349 United States national standard ANSIC37.23 and United Kingdom national standard BS159
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