三进二联道理图(国外英文资料).docVIP

三进二联原理图 The power supply system and its working principle SanJin line 2 bus coupler power supply system with general binary line a bus coupler compared to power supply system has certain advantages, it can master both by a master one, two or three main circuit and power supply and so on the many kinds of schemes can satisfy the demands of high power supply. Now many power users to power supply continuity requirement is higher and higher, so the design of power supply scheme, besides considering parallel power supply transformer 2 road, also in parallel on standby generator power supply, 1 road between 3 road power supply into line with contact circuit, this is mother SanJin line 2 power supply system.  One third to the second one The power supply plan for the third line is shown in figure 1. SanJin line 2 bus coupler the power requirement of the power supply system is the five and three, namely the five main circuit breaker in the power supply system, allowing only and must have three main circuit breaker at the same time in the closing state.  The interlocking circuit of the two-parent power supply system Design thinking Using the main circuit breaker often closed and normally open auxiliary contact (main circuit breaker auxiliary contact is not enough when increasing intermediate relay) move and move us, to control the main circuit breaker closing coil power on or off. The circuit main circuit breaker can be connected when the coils are connected. Otherwise the main circuit breaker cannot be closed, which is that the circuit cannot be powered. Based on this idea, the two main circuit breaker interlocking circuit breaker is designed, as shown in figure 2. 2.2 circuit analysis The function of the interlocking control circuit: when the control circuit is connected, the main circuit breaker is controlled by the circuit. When the control circuit is broken, the main circuit breaker is unable to switch. The main circuit breaker is shown in table 1. In state 1, QF1, QF