Static switch parallel connection method

Abstract

The invention discloses a static switch parallel connection method. According to the method, two sets of static switches STS1 and STS2 which are arranged in parallel are adopted; each set of static switch is composed of six thyristors, a set of control board PCB and a set of thyristor driving board SQ; the six thyristors in the static switch STS1 are divided into a main electric thyristor group JZ1 and a standby electric thyristor group JZ2, wherein each thyristor group comprises three thyristors; the six thyristors in the static switch STS2 are divided into a main electric thyristor group JZ3and a standby electric thyristor group JZ4, wherein each thyristor group comprises three thyristors; the static switch STS1 is a common switch; the static switch STS2 is a standby switch; the staticswitch STS1 is connected with a main power supply circuit A; the static switch STS2 is connected with a standby power supply circuit U; and the output end of the static switch STS1 and the output endof the static switch STS2 are connected in parallel. Compared with a single static switch mode, the double static switch parallel mode adopted by the method can assist in solving the problem that thefault of a single static switch affects the power supply of a rear-end important load, and can improve the reliability of the static switches.

Description

technical field [0001] The invention relates to a static switch, in particular to a method for parallel connection of a static switch. Background technique [0002] The static switch is an automatic switching device that realizes two different AC power sources (frequency, phase, and amplitude may be different). Automatic or manual switching process of main and standby power sources. [0003] The static switch has the following advantages: 1. No contact jumping; 2. Low mechanical noise; 3. Small radio frequency interference; 4. Since there are no movable parts that will be damaged, it is easy to maintain; 6. Not affected by shock and vibration; 7. Can be installed in any direction; 8. High switching speed; 9. Small size in many applications. [0004] The main circuit of the existing static switch such as figure 1 As shown, in the general static switch products, one thyristor is set for the main power and the backup power as the switching device, and the bypass maintenance ...

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Problems solved by technology

[0005] In this circuit mode, when the thyristor device fails or the static switch control board fails, the static switch will have no output, only manual switching to bypass maintenance, the entire switching process takes a long time, and the back-end load will be switched during the switching process. There is no power output, resulting in power interruption, which affects the normal operation of important back-end equipment

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