CN201570896U

CN201570896U - PLC-implemented three-way power source three-section bus independent operation BZT sectioning device

Info

Publication number: CN201570896U
Application number: CN2009202889753U
Authority: CN
Inventors: 唐伟凯; 寇永江; 汪鹏程; 付炜炜; 孙钧
Original assignee: Wuhan Iron and Steel Group Corp
Current assignee: Wuhan Iron and Steel Group Corp
Priority date: 2009-12-09
Filing date: 2009-12-09
Publication date: 2010-09-01
Anticipated expiration: 2019-12-09

Abstract

The utility model relates to a PLC-implemented three-way power source three-section bus independent operation BZT sectioning device which comprises an executing device, a controlling device and a signal acquiring device. The sectioning device is characterized in that the signal acquiring device is used for detecting system faults such as the decompression, the over voltage, the low current, the over current and the like of a system bus, and transferring a detecting signal to a controlling part; the controlling device is a PLC, which is used for logically judging the detecting signal and transferring a controlling signal to the executing device; the executing device is used for realizing the BZT of at least three sections of the bus; the bus is divided into three sections which are independently operated; the each section of the bus is provided with an incoming switch as well as a bus sectioning switch I, a bus sectioning switch II and a bus sectioning switch III which are brake separating positions; and each section of the bus incoming switch is a brake closing position. By adopting the structure, the sectioning device has the advantages of simpler logic control, convenient use, strong interference resistance and long service life.

Description

PLC realizes three sections bus fanout operations of three-way power prepared auto restart sectioning

Technical field

The utility model relates to a kind of backup auto-activating device, and particularly a kind of PLC realizes three sections bus fanout operations of three-way power prepared auto restart sectioning.

Background technology

Present domestic employed backup auto-activating device, extensive use be still traditional electromagnetic type mechanical contact relay, finishing the female connection of the most basic two-period form prepared auto restart mode all must be realized jointly by a plurality of relays, when running into three the road or the prepared auto restart of multichannel inlet wire when requiring, because the logical relation complexity of reciprocal interlocking, the mode that female connection is hauled oneself willingly into is more, makes secondary connection very complicated, the workload of plant maintenance is bigger, and the reliability of hauling oneself willingly into success is not high on the contrary.Simultaneously, also cause the each several part of transformer station may be connected to a complete automated system hardly.Therefore, traditional electromagnetic mechanical contact relay obviously can not satisfy the service requirement that the female connection of multiple power supplies multistage is hauled oneself willingly into.At present, microcomputer protective relay has extensively been promoted in electric power system, is characterized in that protection philosophy realized that by algorithm the control logic function is solidified basically in chip, can not arbitrarily change.Therefore, the microcomputer backup auto-activating device of current application also only is adapted to the comprehensive prepared auto restart of two-period form, and logic is in a single day fixing, can not change flexibly.

The utility model content

Technical problem to be solved in the utility model provides a kind of operational reliability height, control mode three sections bus fanout operations of PLC realization three-way power prepared auto restart sectioning flexibly.

For solving the problems of the technologies described above, the utility model comprises final controlling element, control device, signal pickup assembly, it is characterized in that, described signal pickup assembly is used for the system failures such as detection system bus loss of pressure, overvoltage, low current, overcurrent, and detection signal is transferred to described control section; Described control device is the PLC programmable controller, and detection signal is carried out logic determines, and control signal is transferred to described final controlling element; Described final controlling element is used to realize three sections and three sections prepared auto restarts with Up Highway UHW.

In the such scheme, described bus is three sections and fanout operation, is provided with service entrance switch simultaneously on every section bus, also is provided with I, II and II, III busbar sectional izing switch.

In the such scheme, described I, II and II, III busbar sectional izing switch are the separating brake position, and every section bus service entrance switch is a closing position.

The utility model is owing to adopted said structure, and logic control is simpler, easy to use, interference resistance strong, the advantage of long working life so have.

Description of drawings

Below in conjunction with the drawings and specific embodiments the technical solution of the utility model is further described in detail.

Fig. 1 is the circuit connection diagram of a specific embodiment;

Fig. 2 is a schematic diagram of the present utility model.

Embodiment

As shown in Figure 1; when one, two road power supplys simultaneously during decompression; at this moment; one, two female lower voltage components actions; should judge simultaneously in logic that G111, G211 isolation knife roll whether to be in and close the position; to judge simultaneously also then whether 1DL, the overcurrent protection of 2DL inlet wire move, if the 2DL action, closed bite 5DL, 4DL segmentation.If the 1DL action, 2DL is not moving, closes 5DL, closed bite 4DL.It is all moving that 1DL closes 2DL, closes 5DL earlier, after close 4DL.Before the section breaker logic is closed in execution, should cut off 1DL, 2DL circuit breaker earlier respectively.Simultaneously, charging process is to finish in the 15S under normal operating mode.

Concrete several standby modes are as follows under above logical foundations is judged:

Standby mode 1:T1, T2, T3 fanout operation, 4DL is closed automatically by the AAT device action after the 1DL tripping, and bus I is powered by T2;

Standby mode 2:T1, T2, T3 fanout operation, 5DL is closed automatically by the AAT device action after the 3DL tripping, and bus I is powered by T2;

Standby mode 3:T1, T2, T3 fanout operation, after the 2DL tripping: 1 system is closed by the AAT device action automatically according to setting I-II section 4DL, and bus II is closed by the AAT device action automatically by the T1 power supply or according to setting II-III section 5DL, and bus II is powered by T3; 2 by system according to present load situation decision, the low 4DL that drops into earlier of load is closed automatically by the AAT device action, bus II is closed by the AAT device action automatically by T1 power supply or 5DL, bus II is powered by T3;

Standby mode 4:T1, T2, T3 fanout operation, 1DL, after the 2DL tripping, 5DL is at first closed automatically by the AAT device action, and bus II is powered by T3, has the back of pressure 4DL to be closed automatically by the AAT device action according to bus II afterwards, and bus I is powered by T3;

Standby mode 5:T1, T2, T3 fanout operation, 2DL, after the 3DL tripping, 4DL is at first closed automatically by the AAT device action, and bus II is powered by T1, has the back of pressure 5DL to be closed automatically by the AAT device action according to bus II afterwards, and bus III is powered by T1;

Standby mode 6:4DL closes, and after 1DL disconnected, bus I and bus II were powered by T2, and after the 2DL tripping, 1DL is closed automatically by the AAT device action, and bus I and bus II are powered by T1;

Standby mode 7:3DL closes, and after 2DL disconnected, bus I and bus II were powered by T1, and after the 1DL tripping, 2DL is closed automatically by the AAT device action, and bus I and bus II are powered by T2;

Standby mode 8:5DL closes, and after 2DL disconnected, bus II and bus III were powered by T3, and after the 3DL tripping, 2DL is closed automatically by the AAT device action, and bus II and bus III are powered by T2;

Standby mode 9:5DL closes, and after 3DL disconnected, bus II and bus III were powered by T2, and after the 2DL tripping, 3DL is closed automatically by the AAT device action, and bus II and bus III are powered by T3.

As shown in Figure 2, the utility model comprises stand-by power supply automatic switchover part, control section, signal deteching circuit, described signal deteching circuit is used for the system failures such as detection system bus loss of pressure, overvoltage, low current, overcurrent, and detection signal is transferred to described control section; Described control section is the PLC programmable controller, and detection signal is carried out logic determines, and control signal is transferred to described stand-by power supply automatic switchover part; Described stand-by power supply automaticallyes switch and partly is used to realize three sections and three sections prepared auto restarts with Up Highway UHW.

It should be noted last that, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims

1. a PLC realizes three sections bus fanout operations of three-way power prepared auto restart sectioning, comprise final controlling element, control device, signal pickup assembly, it is characterized in that, described signal pickup assembly is used for the system failures such as detection system bus loss of pressure, overvoltage, low current, overcurrent, and detection signal is transferred to described control section; Described control device is the PLC programmable controller, and detection signal is carried out logic determines, and control signal is transferred to described final controlling element; Described final controlling element is used to realize three sections and three sections prepared auto restarts with Up Highway UHW.

2. PLC according to claim 1 realizes three sections bus fanout operations of three-way power prepared auto restart sectioning, it is characterized in that, described bus is three sections and fanout operation, is provided with service entrance switch simultaneously on every section bus, also is provided with I, II and II, III busbar sectional izing switch.

3. PLC according to claim 2 realizes three sections bus fanout operations of three-way power prepared auto restart sectioning, it is characterized in that described I, II and II, III busbar sectional izing switch are the separating brake position, and every section bus service entrance switch is a closing position.