SCR Electric Drive Automation Device

Description

Overview

This equipment is a DC speed control system, which is alternating current of AC bus rectified into adjustable DC voltage through Silicon Controlled Rectifier (SCR), for the use of adjusting DC motor revolving speed. SCR control system successfully applied for several decades in electric drive oil drilling rig and favored by clients because of its mature, reliability, and less investment.

Main Features

DC-type one to one control system, easy and reliable control structure, individual SCR drive for each motor, using master-slave control manner when operating two motors to realize the synchro-speed and balance of road.

DC-type one to two control system, backup SCR supplied for each motor, flexible drive choose, maintenance with uninterruptible power supply.

Parameter

Output voltage	0～750V
Output amperes	“one for one drive” 0~1400A
Output amperes	“one for two drive” 0~2300A
DC motor	DC separately excited motor adopts (adding excitation)
DC motor	DC series motor adopts
Driving mode	DC separately excited motor adopts “one to one” manner
Driving mode	DC series motor adopts “one to one” or “one to two” manner
Using environment	land, desert, polar region, ocean
Depth	2000 meters~9000 meters

Typical Configuration Solutions

> “One for one” control Features: Control structure is simple and reliable, each motor driven by an independent SCR, when operating dual-motor, adopting master-slave control method to achieve speed synchronization and load balance.

> “One for two” control Features: Each motor has back SCR power supply, with flexible drive mode, repairing with no power outages.

> “Compound” control Features: The dual-motor of each mud pump driven by high power SCR cabinet, DW and RT separately driven by smaller power SCR cabinet.

> “12-pulse rectifier” control

Features: Two sets of three-phase rectifier bridge in series or in parallel to form 12-pulse rectifier circuit, which provided power supply for motor, reduced interference on the power grid, in particular to reduce harmonics. More commonly adopted in parallel proposals, suitable for occasions high quality requirements on the grid.