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A dual-machine parallel device and control method for an emergency DC oil pump starter in a power plant

A technology of starters and main starters, which is applied in the reduction gear of AC motors, starters of single DC motors, motor generators/starters, etc., and can solve problems such as limited anti-overload capacity, easy open circuit or short circuit, etc. Achieve the effects of strong overload resistance, simple structure, and reduced maintenance costs

Inactive Publication Date: 2017-07-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inherent fragility of power electronic components, this type of equipment has limited anti-overload capability, and is prone to open or short circuit failures under extreme conditions.

Method used

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  • A dual-machine parallel device and control method for an emergency DC oil pump starter in a power plant
  • A dual-machine parallel device and control method for an emergency DC oil pump starter in a power plant
  • A dual-machine parallel device and control method for an emergency DC oil pump starter in a power plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] like Figure 1-3 shown.

[0050] A two-machine parallel device for emergency DC oil pump starters in power plants, including a remote command module, a main starter U1, a backup starter U2 and a logic control module; the main circuit of the main starter U1 and the main circuit of the backup starter U2 are connected in parallel ;The main starter U1 is a BUCK conversion type DC oil pump soft starter. The main starter U1 is equipped with a "stop state" contact KM1, a start-up command interface and a shutdown command interface; the backup starter U2 is a resistive DC oil pump starter. The starter U2 is provided with a "shutdown command state" contact KM2, a power-on command interface and a shutdown command interface; the remote command module is provided with a power-on command contact S1 and a power-off command contact S2; The command contact S2, the "shutdown state" contact KM1, and the "shutdown command state" contact KM2 are respectively connected to the logic control ...

Embodiment 2

[0060] The dual-machine parallel device of the emergency DC oil pump starter of the power plant described in Embodiment 1 is different in that: the main starter U1 is provided with a fuse F1. When the internal short-circuit fault occurs in the BUCK conversion type DC oil pump soft starter, the fuse can be blown quickly to prevent the fault from spreading and the DC screen DC circuit breaker from overcurrent tripping.

Embodiment 3

[0062] The dual-machine parallel device of the emergency DC oil pump starter of the power plant as described in Embodiment 2 is different in that: the time relay K3 controls the coil to be energized and the normally open contact K3-2 is closed after a delay of 4 seconds.

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PUM

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Abstract

The invention provides a double-unit parallel connection device of a power plant emergency direct-current oil pump starter and a control method thereof. The double-unit parallel connection device comprises a distant instruction module, a main starter U1, a standby starter U2 and a logic control module, wherein a main circuit of the main starter U1 is connected with a main circuit of the standby starter U2 in parallel; the main starter U1 is a BUCK transform type direct-current oil pump soft starter and is provided with a 'stopped state' contact KM1, a starting-up instruction interface and a shutdown instruction interface; the standby starter U2 is a resistance type direct-current oil pump starter. The double-unit parallel connection device of the power plant emergency direct-current oil pump starter can effectively eliminate current shock generated when a direct-current oil pump is started, greatly reduces influences and damage to the direct-current oil pump, a power supply direct-current screen and other electric equipment, and has high overload resistance capability.

Description

[0001] Technical field: [0002] The invention relates to a dual-machine parallel device and a control method for a soft starter of an emergency DC oil pump in a power plant, and belongs to the technical field of relay protection. [0003] Background technique: [0004] In order to buffer the starting current of the DC oil pump, when the emergency DC oil pump (motor) of the power plant is started, a high-power resistor needs to be connected in series in the starting circuit, and then cut off after the DC motor starts normally. This kind of resistive DC motor soft starter is characterized by simple structure and strong overload resistance, but the mechanical switch has a short life, there is a problem of adhesion, the impact current is large when the motor starts, and it is easy to damage the DC oil pump itself, the power supply DC screen and other power consumption. Equipment causing severe shock. [0005] With the development of power electronics technology in recent years, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P1/18
CPCH02P1/18
Inventor 李建文
Owner SHANDONG UNIV
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