Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Full fault automatic stop relay protection circuit of steam turbine digital electrohydraulic control system master control modular unit

A technology of automatic shutdown and relay protection, applied in the direction of machines/engines, engine components, mechanical equipment, etc., can solve problems such as safety accidents, self-resetting of solenoid valves, abnormal re-activation of steam turbines, etc., to achieve the effect of ensuring safety

Active Publication Date: 2009-05-20
DONGFANG TURBINE CO LTD +1
View PDF0 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the stop button signal disappears, the high-voltage blocking solenoid valve may reset itself, causing the turbine to hang up again abnormally, which is very likely to cause a safety accident

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Full fault automatic stop relay protection circuit of steam turbine digital electrohydraulic control system master control modular unit
  • Full fault automatic stop relay protection circuit of steam turbine digital electrohydraulic control system master control modular unit
  • Full fault automatic stop relay protection circuit of steam turbine digital electrohydraulic control system master control modular unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] see figure 2 , Image 6 : The main control module of this MEH control system is fully fault automatic shutdown relay protection circuit is connected by a time relay SR and a conventional relay R according to "AND" logic.

[0020] Its working principle is: the configuration logic of the engineer station of the MEH control system sends two pulse signals, which are respectively output through one channel of the two output modules (dry contact output), and the two pulse signals are respectively connected to the The start signal input terminal of the time relay SR. When the main control unit (DPU) of the MEH control system is working normally, the pulse signal will also be continuously sent out. At this time, the wire package of the time relay SR is always charged, and its normally closed contact SR 1 In the disconnected state, the conventional relay R does not act. If the main control module of the MEH control system fails completely, the pulse signal will disappear im...

Embodiment 2

[0022] see image 3 , Image 6 : The main control module of this MEH control system is fully fault automatic shutdown relay protection circuit is connected by two time relays 1SR, 2 SR according to "OR" logic, and then connected with a conventional relay R according to "AND" logic.

[0023] Its working principle is: the configuration logic of the engineer station of the MEH control system sends two pulse signals, which are respectively output through one channel of the two output modules (dry contact output), and the two pulse signals are respectively connected to the The start signal input terminal of time relays 1SR and 2 SR. When the main control unit (DPU) of the MEH control system is working normally, the pulse signal will also be continuously sent out. At this time, the wire packages of the time relays 1SR and 2 SR are always charged, and their normally closed contact 1SR 1 , 2 SR 1 In the disconnected state, the conventional relay R does not act. If the main contro...

Embodiment 3

[0025] see Figure 4 , Image 6 : The main control module of this MEH control system is fully fault automatic shutdown relay protection circuit by two time relays 1SR, 2 SR connected by "AND" logic, and then connected with a conventional relay R by "AND" logic.

[0026] Its working principle is: the configuration logic of the engineer station of the MEH control system sends two pulse signals, which are respectively output through one channel of the two output modules (dry contact output), and the two pulse signals are respectively connected to the The start signal input terminal of time relays 1SR and 2 SR. When the main control unit (DPU) of the MEH control system is working normally, the pulse signal will also be continuously sent out. At this time, the wire packages of the time relays 1SR and 2 SR are always charged, and their normally closed contact 1SR 1 , 2 SR 1 In the disconnected state, the conventional relay R does not act. If the main control module of the MEH c...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a total failure autostop relay protection circuit for a master control module of a digital electro-hydraulic control system of a steam turbine. The circuit has an autostop relay controlled by soft logic. The autostop relay protection circuit which adopts hardware electric elements is formed by a time relay and the prior relay which are connected according to the 'AND' logic. A wire pad of the time relay is connected with an output module of a master control member; and a normally-open contact of the prior relay is connected in parallel with a normally-open contact of the autostop relay controlled by the soft logic. The total failure autostop relay protection circuit has the advantages that under the condition that a soft logic control system of the steam turbine has failure, the steam turbine is automatically stopped through hard wiring relay logic, thereby ensuring the safety of the steam turbine.

Description

technical field [0001] The invention relates to a digital electro-hydraulic control system of a steam turbine, in particular to a relay protection circuit for automatic shutdown of a main control module of the system in full failure. Background technique [0002] The conventional steam turbine digital electro-hydraulic (MEH) control system automatically stops the relay logic such as figure 1 As shown, since the relay R3 is controlled by soft logic, when the main control module of the MEH control system is completely faulty (for example, both DPUs are faulty), the relay R3 will not act, and the control system will not be able to output the MEH automatic shutdown signal, thus making the A steam turbine spinning at high speed is in a dangerous runaway state. At this time, the state of all open signals of the MEH control system will keep the state before the failure of the main control module, and the relay controlling the high-voltage shut-off solenoid valve will not act. . ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): F01D21/00
Inventor 王强彭敏
Owner DONGFANG TURBINE CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com