CN203277136U - Novel busbar earthing knife-switch control system - Google Patents

Abstract

A novel busbar earthing knife-switch control system comprises a bus coupler isolation knife-switch, circuit isolation knife-switches and busbar earthing knife-switches, and also comprises an alternating current power supply and a mechanism case of the above busbar earthing knife-switches. The bus coupler isolation knife-switch and the circuit isolation knife-switches are all provided with auxiliary switch contacts. The novel busbar earthing knife-switch control system also comprises a PLC. One end of each auxiliary switch contact of the bus coupler isolation knife-switch and the circuit isolation knife-switches is correspondingly connected with each X input terminal of the PLC, and the other ends of the auxiliary switch contacts are connected in parallel and access to a COM input terminal of the PLC. One input end of the mechanism case of the busbar earthing knife-switches is correspondingly connected with Y output terminals of the PLC, and the other input ends are connected in parallel and access to a zero line of the alternating current power supply. A live wire of the alternating current power supply accesses to a corresponding output terminal of the PLC. By the adoption of the novel busbar earthing knife-switch control system, wiring of an electrical operating circuit of the busbar earthing knife-switches can be effectively simplified, and it is convenient for subsequent overhauling and refitting of the electrical operating circuit of the busbar earthing knife-switches.

Description

A kind of novel bus grounding switch control system

Technical field

The utility model relates to the disconnecting link control technology field in electric power system, is specifically related to a kind of bus grounding disconnecting link control system system of the PLC of utilization decision operation condition.

Background technology

Disconnecting link is a kind of isolating switch that can see cut-off point.Disconnecting link in electric power system comprises isolation switch and grounding switch.By separating isolation switch, power failure equipments and charging equipment are separated in electric power system; By the grounding switch that closes, power failure equipments is communicated with the earth again, makes the staff can contact safely this power failure equipments.

Fig. 1 represents the disconnecting link connection diagram (situation of bus 2M does not draw) of bus 1M.As shown in Figure 1, the initial and end of bus 1M all is connected to bus grounding disconnecting link, be respectively first 0G and second 0G, between the tie point of bus 1M Up Highway UHW 1M and two bus grounding disconnecting link first 0G, second 0G, be connected to many circuits, bus 1M is by circuit isolation switch 1G, 2G ... the NG realization is connected and disconnection with respective lines.Bus 1M is connected by bus connection switch GBM with 2M, is in series with 1 bus bar side mother isolation switch M1G between the tie point of bus connection switch GBM and bus 1M, is in series with 2 bus bar side mother isolation switch M2G between the tie point of bus connection switch GBM and bus 2M.

Stipulate according to electric operation, before the bus grounding disconnecting link operation of deciliter certain bus, must guarantee that this bus does not connect any power supply, namely must first disconnect all circuits and other bus of being connected with this bus, specifically must disconnect all circuit isolation switchs and the mother isolation switch that is connected with this bus.

In prior art, to the control of above-mentioned bus grounding disconnecting link divide-shut brake condition, be to realize by the auxiliary switch contact of connect corresponding circuit isolation switch and mother isolation switch.Auxiliary switch contact is generally paired appearance, be used for judging the positional information switching value of the divide-shut brake situation of corresponding disconnecting link.As shown in Figure 2, the circuit theory diagrams in the electric operation loop of two bus grounding disconnecting link first 0G, second 0G in Fig. 2 presentation graphs 1.In figure, first group of auxiliary switch contact of circuit isolation switch 1G, 2G, NG and 1 bus bar side mother isolation switch M1G in 1G ', 2G ', NG ', M1G ' difference presentation graphs 1; Second group of auxiliary switch contact of circuit isolation switch 1G, 2G, NG and 1 bus bar side mother isolation switch M1G in 1G ' ', 2G ' ', NG ' ', M1G ' ' difference presentation graphs 1, before they are connected on the mechanism case of corresponding bus grounding disconnecting link first 0G or second 0G as shown in Figure 2, consist of the condition of power supply being sent into mechanism case.When corresponding isolation switch disconnected, its auxiliary switch contact was closed.As shown in Figure 2, only have when the auxiliary switch contact of relevant isolation switch is all closed, power supply L could arrive the mechanism case of respective bus bars grounding switch first 0G or second 0G, after power supply access corresponding mechanism case, just can operate the dividing of this bus grounding disconnecting link, combined floodgate.

In Fig. 2, also be in series with five anti-lock before the mechanism case of bus grounding disconnecting link first 0G or second 0G.Five anti-lock be a kind of P cock that prevents misoperation.Five anti-lock normal open switch are connected in disconnecting link electric operation loop, and when using five correct anti-lock keys to insert this five when anti-lock, five anti-lock normal opened contacts are closed, the electric operation loop conducting of this disconnecting link, but normal running this moment disconnecting link opening and closing.Use five anti-lockly, can prevent staff's misoperation disconnecting link, avoid accident to occur.

Fig. 3 is the physical cabling figure in electric operation loop corresponding to Fig. 2, and as can be seen from Figure 3, there is following drawback in existing bus grounding disconnecting link electric operation loop:

1) auxiliary switch contact can not be reused, tie up that to establish cable too much, as shown in Figure 3: because the operating power of first 0G, two bus grounding disconnecting links of second 0G is separate, so upper all circuit isolation switch 1G, 2G, NG and the 1 bus bar side mother isolation switch M1G of bus 1M need configuration at least two group auxiliary switch contacts, so that the electric operation loop of access respective bus bars grounding switch, and the wiring in the electric operation loop of each bus grounding disconnecting link is also independently;

2) change barring condition difficulty: when new installation circuit or remove old circuit, when needing the barring condition of certain grounding switch of change, need the wiring of change circuit, need to dig out cable in cable trough, again be linked into the auxiliary switch contact of relevant disconnecting link;

3) electric operation loop maintenance difficult: the electric operation loop of the bus grounding disconnecting link auxiliary switch ground connection of the isolation switch of all circuits on this bus of having connected, as long as any auxiliary switch contact fault, operation circuit is with not conducting, the staff need to find out loop diagram, the test of auxiliary switch contact one by one, for some old transformer stations, if drawing is lost, breakdown maintenance is difficulty especially.

The utility model content

Technical problem to be solved in the utility model, just be to provide a kind of novel bus grounding disconnecting link control system, this bus grounding disconnecting link control system can effectively be simplified the wiring in the electric operation loop of this bus grounding disconnecting link, and convenient follow-up maintenance and repacking to this bus grounding disconnecting link electric operation loop.

solve the problems of the technologies described above, the technical scheme that the utility model is taked is as follows: a kind of novel bus grounding switch control system, comprise the mother isolation switch that is connected with certain bus, the circuit isolation switch, bus grounding disconnecting link, the mechanism case that also comprises AC power and above-mentioned bus grounding disconnecting link, described mother isolation switch, the circuit isolation switch all has auxiliary switch contact, it is characterized in that, described novel bus grounding switch control system also comprises PLC, described mother isolation switch, one end of the auxiliary switch contact of circuit isolation switch is corresponding connected one by one with the X input terminal of described PLC, their other end parallel connection accesses the COM input terminal of PLC afterwards, one input of the mechanism case of described bus grounding disconnecting link is corresponding connected one by one with the Y lead-out terminal of described PLC, another input parallel connection accesses the zero line of described AC power afterwards, the upper corresponding COM lead-out terminal of live wire access PLC of AC power,

PLC judges when the divide-shut brake condition of the bus grounding disconnecting link of this bus satisfies, and described AC power is accessed the mechanism case of the bus grounding disconnecting link of this bus.

PLC: English program logic control, programmable logic controller (PLC) is a kind of electric controller by the programmable chip decision logic.Its main feature is with inner a large amount of defined various output relays, replaces traditional mechanical contact relay, replaces actual circuit connecting wire by the software programming mode with the internal logic relation again.

The mechanism case of disconnecting link is the electric operation mechanism of disconnecting link.Being connected between disconnecting link and its mechanism case belongs to prior art.Access the mechanism case of this disconnecting link at external power after, but this disconnecting link of normal running deciliter.

The utility model is introduced PLC, utilize the operating condition of PLC judgement bus grounding disconnecting link, not only can replace the electric operation loop of bus grounding disconnecting link of the prior art fully, and can effectively simplify the wiring in bus grounding disconnecting link electric operation loop, make the electric operation loop of bus disconnecting link more reliable, and maintenance and reequip convenient.When PLC detects the operating condition that satisfies grounding switch, in PLC, the normal opened contact of corresponding output relay is closed, the mechanism case of respective bus bars grounding switch is switched on power, namely gives the mechanism case energising of this bus grounding disconnecting link, so can operate this bus grounding disconnecting link deciliter; When the operating condition that this bus grounding disconnecting link detected as PLC does not all satisfy, the output relay that is connected with the mechanism case of this bus grounding disconnecting link in PLC just can be not closed, power supply can't arrive the mechanism case of this bus grounding disconnecting link, can not operate this bus grounding disconnecting link deciliter.The operating condition of bus grounding disconnecting link refers to: before operating the bus grounding disconnecting link divide-shut brake of this bus, must disconnect all the circuit isolation switchs and the mother isolation switch that are connected with this bus.

Be in series with the First Five-Year Plan between the Y lead-out terminal of the mechanism case of described bus grounding disconnecting link and coupled PLC anti-lock, be used for strengthening the fail safe of native system, prevent misoperation.

Relative prior art the utlity model has following beneficial effect:

1) be conducive to reduce the quantity of auxiliary switch contact, simplify circuit connection: the operating condition of utilizing PLC judgement bus grounding disconnecting link, only need the position signalling switching value of circuit isolation switch, bus isolation switch on bus is linked in PLC, make primary connection, software realization in PLC is all passed through in the judgement of the operating condition of bus grounding disconnecting link, need not to described mother isolation switch, circuit isolation switch, many group auxiliary switch contacts to be set, also need not to lay many cable lines;

2) the circuit repacking easily: increase the circuit isolation switch on bus newly or remove old circuit isolation switch, when needing the divide-shut brake condition of change bus grounding disconnecting link operation circuit, only need being connected or removing being connected of old circuit isolation switch and PLC of corresponding increase new line isolation switch and PLC, and the program in corresponding modify PLC get final product, and it is simple and clear that circuit is reequiped;

3) maintenance of electric operation loop easily: on bus, the auxiliary switch contact of circuit isolation switch, mother isolation switch is linked into separately respectively PLC, need not mutual series connection, and the auxiliary switch contact of each disconnecting link is independent mutually, and wiring is clear, and the line inspection is easy.

4) possesses the microcomputer anti-error operating function: use at present electric loop wiring, the anti-upper misoperation disconnecting link of the two method for preventing misoperation of supervisory control comuter.After adopting PLC to control disconnecting link, electric loop wiring access PLC by PLC innernal CPU Rule of judgment, namely realizes the microcomputer anti-error operating function.

Description of drawings

Fig. 1 represents the disconnecting link connection diagram of bus 1M;

The circuit theory diagrams in the electric operation loop of two bus grounding disconnecting link first 0G, second 0G in Fig. 2 presentation graphs 1;

Fig. 3 is the physical cabling figure in electric operation loop corresponding to Fig. 2;

Fig. 4 is the better enforcement of the corresponding novel bus grounding switch of Fig. 1 median generatrix grounding switch control system

The wiring schematic diagram of example.

Embodiment

Be further described below in conjunction with accompanying drawing 1,4 pairs of a kind of novel bus grounding switch control system of the present utility model.

Stipulate according to electric operation, before the bus grounding disconnecting link divide-shut brake of operation bus 1M, must disconnect the line side isolation switch that all are connected with bus 1M, i.e. line side isolation switch 1G, 2G ... NG, also must disconnect 1 bus bar side mother isolation switch M1G, not charged to guarantee bus 1M.

For Fig. 1, we can build following novel bus grounding switch control system for it in this way.This system comprises mother isolation switch M1G, circuit isolation switch 1G, the 2G that is connected with bus 1M ... NG, bus grounding disconnecting link first 0G, second 0G also comprise the mechanism case 2 and five anti-lock 3 and PLC of AC power 1 and above-mentioned bus grounding disconnecting link first 0G, second 0G.Mother isolation switch M1G, circuit isolation switch 1G, 2G ... NG has respectively auxiliary switch contact M1G ', 1G ', 2G ' ... NG ', when corresponding isolation switch disconnected, its corresponding auxiliary switch contact was closed.

As described in Figure 4, mother isolation switch M1G, circuit isolation switch 1G, 2G ... auxiliary switch contact M1G ', the 1G ' of NG, 2G ' ... the end of NG ' is corresponding connected one by one with input terminal X1～X4 of PLC, and their other end parallel connection accesses the COM input terminal of PLC afterwards; One input of the mechanism case 2 of first 0G, second 0G bus grounding disconnecting link is corresponding connected one by one with lead-out terminal Y1～Y2 of PLC, the zero line N of incoming transport power supply 1 after another input parallel connection, the upper COM lead-out terminal corresponding to above-mentioned lead-out terminal Y1～Y2 of live wire L access PLC of AC power 1.Also be in series with respectively the First Five-Year Plan between lead-out terminal Y1～Y2 of the mechanism case 2 of first 0G, second 0G bus grounding disconnecting link and coupled PLC anti-lock 3, be used for strengthening the fail safe of native system, prevent misoperation.

Programme in PLC according to the situation of the circuit isolation switch that is connected with bus 1M in Fig. 1, mother isolation switch, the switching condition of definition bus grounding disconnecting link first 0G, second 0G.As circuit isolation switch 1G, 2G ... the position of NG, mother isolation switch M1G is a minute position entirely, be that their auxiliary switch contact is entirely when the co-bit, the output relay adhesive that is connected with lead-out terminal Y1～Y2 in PLC, the COM lead-out terminal of PLC is communicated with Y1～Y2 lead-out terminal, even power firestreak L is switched to the five anti-lock of first 0G, second 0G, after inserting five correct anti-lock keys, power supply namely is switched to the mechanism case of first 0G, second 0G.At circuit isolation switch 1G, 2G ... in NG, mother isolation switch M1G, any one is not when dividing the position, the not adhesive of output relay that is connected with lead-out terminal Y1～Y2 in PLC, power supply can't arrive the mechanism case of respective bus bars grounding switch, and the respective bus bars grounding switch can not carry out breaking-closing operating.

The PLC Programming principle of the present embodiment sees the following form:

Each operation disconnecting link is complete, should disconnect AC power, takes out five anti-lock keys, guarantees that the mechanism case of disconnecting link can be by misoperation.

Claims (2)

1. novel bus grounding switch control system, comprise the mother isolation switch that is connected with certain bus, the circuit isolation switch, bus grounding disconnecting link, the mechanism case that also comprises AC power and above-mentioned bus grounding disconnecting link, described mother isolation switch, the circuit isolation switch all has auxiliary switch contact, it is characterized in that, described novel bus grounding switch control system also comprises PLC, described mother isolation switch, one end of the auxiliary switch contact of circuit isolation switch is corresponding connected one by one with the X input terminal of described PLC, their other end parallel connection accesses the COM input terminal of PLC afterwards, one input of the mechanism case of described bus grounding disconnecting link is corresponding connected one by one with the Y lead-out terminal of described PLC, another input parallel connection accesses the zero line of described AC power afterwards, the upper corresponding COM lead-out terminal of live wire access PLC of AC power,

PLC judges when the divide-shut brake condition of the bus grounding disconnecting link of this bus satisfies, and described AC power is accessed the mechanism case of the bus grounding disconnecting link of this bus.

2. novel bus grounding switch control system according to claim 1, is characterized in that, is in series with the First Five-Year Plan between the Y lead-out terminal of the mechanism case of described bus grounding disconnecting link and coupled PLC anti-lock.

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