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Soft starter for medium and high-voltage thyristors of motor

A technology of soft starter and thyristor, which is applied in the direction of single multi-phase induction motor starter, motor generator/starter, etc., to achieve the effect of good operation reliability, long service life and reliable overvoltage protection performance

Inactive Publication Date: 2015-01-21
SHANDONG YUANSI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method adopts the traditional external power supply to connect the trigger pole and the cathode of each tube respectively through each pulse transformer. The data requirements are very strict, which is very difficult in material selection, so that it is still difficult to form mass production. In addition, the technical parameters of each tube used in series and the rising edge and width of the pulse transformer pulse are easy to change, resulting in triggering. The inconsistency of each tube's turn-on and turn-off time can easily cause breakdown damage to the entire string of thyristors

Method used

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  • Soft starter for medium and high-voltage thyristors of motor

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Embodiment Construction

[0017] The present invention will be further described below with reference to the drawings and embodiments.

[0018] Such as figure 1 As shown, the present invention includes a control circuit 10 for controlling the voltage output of the starter. The control circuit 10 may be such as figure 1 The circuit shown can also be a variable resistor, or other types of control circuits for controlling the voltage output of the starter. The control circuit 10 has a first access point 10-1 and a second access point 10-2. In this embodiment, the first access point 10-1 is the positive terminal of the control circuit, and the second access point 10- 2 is the negative terminal of the control circuit.

[0019] The present invention also includes the A phase used to connect the medium and high voltage three-phase power supply and the D of the medium and high voltage three-phase motor. A Phase A is reversed in parallel thyristor series component circuit 1, A is reversed in parallel thyristor s...

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Abstract

The invention discloses a soft starter for medium and high-voltage thyristors of a motor. The soft starter is characterized in that anti-parallel thyristor serial module circuits are connected with switch transformer combinational circuits, the switch transformer combinational circuits are connected with rectifier bridge combinational circuits, and the rectifier bridge combinational circuits are connected with a control circuit. The soft starter has the advantages that the overvoltage protection performance of the soft starter is reliable, an integral thyristor string cannot be broken down and damaged due to change of parameters of various serial thyristors, and the soft starter is good in running reliability and long in service life.

Description

technical field [0001] The invention relates to a thyristor soft starter for medium and high voltage motors. Background technique [0002] Compared with reactive and resistive step-down starters, thyristor soft starters for medium and high voltage motors have technical advantages such as large starting torque and short starting time. However, since the withstand voltage value of the currently produced thyristors does not meet the requirements of being directly connected to the power grid, the method of multi-level and multi-transistor series application is adopted. The above method adopts the traditional external power supply to connect the trigger pole and the cathode of each tube respectively through each pulse transformer. The data requirements are very strict, which is very difficult in material selection, so that it is still difficult to form mass production. In addition, the technical parameters of each tube used in series and the rising edge and width of the pulse tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P1/28
Inventor 李亭
Owner SHANDONG YUANSI TECH CO LTD
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