CN204538802U - Middle pressure power transmission and distribution automatic switching control system - Google Patents

Abstract

The utility model relates to middle pressure power transmission and distribution automatic switching control system, comprise and control rack and PLC, the cabinet of control rack is arranged the select button of touch-screen and switching/releasing, PLC is arranged at and controls in rack, be connected by communication cable with touch-screen, and control cable with select button by first and be connected; PLC controls cable by second and feeds out with first via bus, the second road bus, the first incoming power, the second incoming power, first respectively to feed out with circuit breaker, second and be connected with circuit breaker, the first lead-in circuit breaker, the second lead-in circuit breaker and bus, with according to their state to the first incoming power, the second incoming power, the first transmission line circuit, the second transmission line circuit or/and bus closes a floodgate or sub-switching operation.The utility model can make at least for subsequent use each other between two-way incoming power automatically.

Description

Medium voltage transmission and distribution automatic switching control system

technical field

The utility model relates to the technical field of electric power automation, in particular to an automatic switching control system for medium-voltage power transmission and distribution.

Background technique

At present, in some important power consumption places, such as data centers, in order to ensure the reliability of power consumption, the medium voltage primary system generally uses a medium voltage generator set as a backup power supply in addition to the dual mains power supply.

As shown in Figure 1, a medium-voltage primary system of the prior art is a control system for two incoming power supplies and one bus connection, including a first bus 1, a second bus 2, a first incoming power 3, The second incoming power supply 4 and the bus tie circuit breaker 7 . The first bus 1 is connected with a plurality of first outlet circuits L11-L117, and each first outlet circuit is provided with a first feed-out circuit breaker 8. The second bus 2 is connected with a plurality of second outlet circuits L21 - L217 , and each second outlet circuit is provided with a second feed-out circuit breaker 9 . The first incoming power supply 3 is connected to the first bus 1 through a first incoming circuit breaker 5 . The second incoming power supply 4 is connected to the second bus 2 through a second incoming circuit breaker 6 . The bus tie circuit breaker 7 is connected between the first bus 1 and the second bus 2 .

As shown in Figure 2, another medium-voltage primary system of the prior art is a control system for four incoming lines and one bus tie, including a first bus 1, a second bus 2, a first incoming power supply 3, The second incoming power supply 4 and the bus tie circuit breaker 7 . The first bus 1 is connected with a plurality of first outlet circuits L11-L117, and each first outlet circuit is provided with a first feed-out circuit breaker 8. The second bus 2 is connected with a plurality of second outlet circuits L21 - L217 , and each second outlet circuit is provided with a second feed-out circuit breaker 9 . The first incoming power supply 3 is connected to the first bus 1 through a first incoming circuit breaker 5 . The second incoming power supply 4 is connected to the second bus 2 through a second incoming circuit breaker 6 . The bus tie circuit breaker 7 is connected between the first bus 1 and the second bus 2 . The first line power supply 3 includes a first mains power supply 31 of 6-35kV and a first emergency power supply 32, and the second line power supply 4 includes a second mains power supply 41 of a 6-35kV and a second emergency power supply 42. The first incoming circuit breaker 5 includes the first mains incoming circuit breaker 51 and the first emergency incoming circuit breaker 52, and the second incoming circuit breaker 6 includes the second mains incoming circuit breaker 61 and the second emergency Incoming circuit breaker 62.

As shown in Figure 3, another medium-voltage primary system of the prior art is a control system for six incoming lines and one bus tie, including a first bus 1, a second bus 2, a first incoming power supply 3, and a second bus connection. Two incoming power supply 4 and bus tie circuit breaker 7. The first bus 1 is connected with a plurality of first outlet circuits L11-L117, and each first outlet circuit is provided with a first feed-out circuit breaker 8. The second bus 2 is connected with a plurality of second outlet circuits L21 - L217 , and each second outlet circuit is provided with a second feed-out circuit breaker 9 . The first incoming power supply 3 is connected to the first bus 1 through a first incoming circuit breaker 5 . The second incoming power supply 4 is connected to the second bus 2 through a second incoming circuit breaker 6 . The bus tie circuit breaker 7 is connected between the first bus 1 and the second bus 2 . The first line power supply 3 includes a first mains power supply 31 of 6-35kV and two first emergency power supplies 32, and the second line power supply 4 includes a second mains power supply 41 of a 6-35kV and two second emergency power supplies. Emergency power supply 42, the first incoming circuit breaker 5 includes a first mains incoming circuit breaker 51 and two first emergency incoming circuit breakers 52, and the second incoming circuit breaker 6 includes a second mains incoming circuit breaker 61 and two second emergency incoming circuit breakers 62.

The medium-voltage primary systems mentioned above all adopt segmented single busbars. Each busbar is introduced with one mains power supply, one generator set power supply, and a bus-tie circuit breaker is set between the two busbar sections. During normal operation, the two sections of busbars are powered by two commercial power sources respectively, and the bus tie circuit breaker is in the opening position. The circuit breaker performs closing operation, and one power supply supplies power to the two busbars. Because the control is manually operated, it is impossible to deal with the power failure in time. Because of this, there must be a defect that the load cannot run for a long time due to a power failure. Moreover, when both power sources fail, there is a defect that the load cannot run completely. Moreover, there is also the defect that the load usage cannot be flexibly adjusted according to the bus condition.

Utility model content

The purpose of the utility model is to provide an automatic switching control system for medium-voltage power transmission and distribution in view of the problems existing in the existing power transmission and distribution system.

In order to achieve the above purpose, the medium voltage power transmission and distribution automatic switching control system provided by the utility model is used in the medium voltage primary system, and the medium voltage primary system includes the first bus bar, the second bus bar, the first incoming power supply , the second incoming power supply and the bus tie circuit breaker, the first bus is connected with a plurality of first outgoing circuits, and each first outgoing circuit is provided with a first feed-out circuit breaker; the second There are multiple second outlet circuits connected to the bus, and each second outlet circuit is provided with a second feed-out circuit breaker; the first incoming power supply is connected to the first bus through a first incoming circuit breaker. connection; the second incoming power supply is connected to the second bus through a second incoming circuit breaker; the automatic switching control system for medium-voltage power transmission and distribution includes:

A control cabinet, the cabinet body is provided with a touch screen and selection buttons for switching/disengaging; and

The PLC controller is arranged in the control cabinet, connected with the touch screen through a communication cable, and connected with the selection button through a first control cable;

Wherein, the PLC controller is respectively connected to the first busbar, the second busbar, the first incoming power supply, the second incoming power supply, and the first feeder through the second control cable. The outlet circuit breaker, the second feed-out circuit breaker, the first incoming line circuit breaker, the second incoming line circuit breaker and the bus tie circuit breaker are connected to control the first The first incoming power supply, the second incoming power supply, the first outgoing line circuit, the second outgoing line circuit or/and the bus tie circuit breaker are closed or opened. the

In the above-mentioned automatic switching control system for medium-voltage power transmission and distribution, the PLC controller is connected to a power monitoring system through a third control cable.

In the above-mentioned automatic switching control system for medium-voltage power transmission and distribution, there are two sets of PLC controllers.

In the above-mentioned medium-voltage power transmission and distribution automatic switching control system, the PLC controller is connected to a UPS power supply, and the UPS power supply is arranged in the control cabinet.

In the above-mentioned automatic switching control system for medium-voltage power transmission and distribution, the first incoming power supply includes a 6-35kV first mains power supply and at least one first emergency power supply, and the second incoming power supply includes a 6-35kV second mains power supply and at least one second emergency power supply, the first incoming circuit breaker includes the first mains incoming circuit breaker and the first emergency incoming circuit breaker, the second incoming circuit breaker The switch includes a second mains incoming circuit breaker and a second emergency incoming circuit breaker, the first mains power supply, the first emergency power supply, the second mains power supply, the second emergency power supply, the The first mains incoming circuit breaker, the first emergency incoming circuit breaker, the second mains incoming circuit breaker, and the second emergency incoming circuit breaker communicate with each other through their corresponding second control cables The PLC controller is connected.

The beneficial effect of the utility model is that, with the help of the medium-voltage power transmission and distribution automatic switching control system of the utility model, the normal power supply is used when there is a normal mains power supply, and when a normal power supply fails, it is automatically used through the bus tie circuit breaker Another kind of normal power supply, when all the normal power sources are out of power, the corresponding emergency power supply can be automatically enabled, not only can timely respond to power failures, but also, when both power supplies fail, the load can also run normally, Moreover, the load usage can be flexibly adjusted according to the bus condition.

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the utility model.

Description of drawings

Fig. 1 is a structural block diagram of a medium voltage primary system of the prior art;

Fig. 2 is a structural block diagram of another medium-voltage primary system of the prior art;

Fig. 3 is a structural block diagram of another medium-voltage primary system in the prior art;

Fig. 4 is a structural block diagram of the medium voltage transmission and distribution automatic switching control system of the present invention;

Fig. 5 is a flowchart of the automatic switching control method for medium-voltage power transmission and distribution of the present invention.

Among them, reference signs

1—the first busbar

2—the second busbar

3—The first incoming power supply

31—the first mains power supply

32—first emergency power supply

4—Second incoming power supply

41—Second mains power supply

42—second emergency power supply

5—The first incoming circuit breaker

51—the first mains incoming circuit breaker

52—The first emergency incoming circuit breaker

6—Second incoming circuit breaker

61—Second mains incoming circuit breaker

62—Second emergency incoming circuit breaker

7—Bus tie circuit breaker

8—The circuit breaker for the first feed-out

9—The circuit breaker for the second feed-out

L11～L117—the first outlet circuit

L21～L217—the second outlet circuit

100—control cabinet

101—Select button

102——touch screen

10—PLC controller

20—UPS power supply

200—Power monitoring system

Detailed ways

The technical scheme of the utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments, so as to further understand the purpose, scheme and effect of the utility model, but not as a limitation of the scope of protection of the appended claims of the utility model.

The main utility model point of the utility model is to set up two incoming power supplies, and set a bus tie circuit breaker so that the two incoming power supplies can serve as backups for each other. Each incoming power supply can be divided into normal mains power supply and emergency power supply. (such as generator power supply, UPS power supply, solar power generation power supply, water power generation power supply, etc.) The medium voltage primary system is equipped with an automatic switching control system, and the automatic switching of the medium voltage primary system is realized through the PLC controller of the automatic switching control system Control to use the normal mains power supply when there is a normal mains power supply. When one normal mains power supply fails, use the normal mains power supply of other roads to supply power through the bus tie circuit breaker. When all normal mains power supplies are out of power , enable the corresponding emergency power supply.

As shown in Figure 4, the medium voltage transmission and distribution automatic switching control system of the present utility model includes a control cabinet 100 and a PLC controller 10, and a touch screen 102 and a selection button 101 for switching/removing are arranged on the cabinet body of the control cabinet 100 , the PLC controller 10 is arranged in the control cabinet 100, is connected with the touch screen 102 through a communication cable, and is connected with the selection button 101 through a control cable (in order to show a difference, the control cable here is also called the first control line cable). In order to realize the automatic switching control of the medium-voltage primary system, the PLC controller 10 communicates with the first One bus 1, second bus 2, first incoming power supply 3, second incoming power supply 4, first outgoing circuit breaker 8, second outgoing circuit breaker 9, first incoming circuit breaker 5 , the second incoming line circuit breaker 6 and the bus tie circuit breaker 7 are connected to the first incoming line power supply 3, the second incoming line power supply 4, the first outgoing line circuit, the second outgoing line circuit or/and the bus tie according to their state The circuit breaker 7 performs a closing or opening operation. the

The control method of the present invention will be introduced in detail below in conjunction with specific embodiments.

first embodiment

This embodiment is mainly aimed at the control of the medium-voltage primary system of the two-way incoming power supply and one bus-connection shown in FIG. 1 . In this embodiment, both the first incoming power supply and the second incoming power supply are 6-35kV commercial power supplies (that is, medium-voltage power supplies), preferably, the first incoming power supply and the second incoming power supply are both 10kV mains power supply.

Referring to Figure 5, when the control system of this embodiment performs automatic switching control of medium-voltage power transmission and distribution, it includes steps:

S100, switch on the medium-voltage power transmission and distribution automatic switching control system, put the first incoming power supply and the second incoming power supply into operation, and make the bus tie circuit breaker in the opening state;

S200, respectively collect the voltages of the first incoming power supply, the second incoming power supply, the first busbar and the second busbar, and at the same time collect the voltages of the first incoming line circuit breaker, the second incoming line circuit breaker, and the first outgoing line The state signal of the circuit breaker and the second feed-out circuit breaker (the state signal here includes that the current is less than a set value and is in a fault state);

S300, judging whether automatic switching is required according to the collected voltage and status signals, if not, return to step S200 or give an alarm; if automatic switching is required, proceed to step S400;

S400, for automatic switching.

Specifically, it is divided into the following situations:

(1) Under normal circumstances: Remote operation of closing or opening can be performed on incoming lines, bus couplers and feeders in the system.

(2) When one incoming line power supply loses power, automatically disconnect the incoming line circuit breaker that has lost power, and then simultaneously disconnect all the feed-in circuit breakers in the bus section that has lost power, close the bus tie circuit breaker, and then close in sequence according to the procedure Open all feed-in circuit breakers earlier. Specifically, in step S300, if the voltage of the first incoming power supply 3 is less than a set value (for example, when it is zero), it can certainly be judged according to the state signal of the first incoming circuit breaker 5, if the first When the current of the incoming circuit breaker 5 is less than a set value (for example, zero) or the first incoming circuit breaker 5 is in a fault state (subsequent relevant criteria are similar to this), it is determined that automatic switching is required, and then step S401 is performed : Disconnect the first incoming line circuit breaker 5 and all the first outgoing line circuits L11~L117, then close the bus tie circuit breaker 7, and then close the disconnected first outgoing line circuits L11~L117 in sequence according to a set sequence The circuit breaker 8 is used for the first feed-out. In step S300, if the voltage of the second incoming line power supply 4 is less than a set value (for example, when it is zero), it can also be judged according to the state signal of the second incoming line circuit breaker 6, if the second incoming line circuit breaker When the current of 6 is less than a set value (for example, zero) or the second incoming circuit breaker 6 is in a fault state (subsequent relevant criteria are similar to this), it is judged that automatic switching is required, and the step S401 to be performed is: break Open the second incoming line circuit breaker 6 and all the second outgoing line circuits L21~L217, then close the bus tie circuit breaker 7, and then close the disconnected second outgoing line circuit breakers on the second outgoing line circuits L21~L217 in sequence according to a set sequence. Feed-out circuit breaker 9.

(3) When a section of the bus fails, the program will be locked without any operation, and an alarm message will be sent to the monitoring center at the same time.

(4) In order to prevent the circuit breaker from closing and opening after the control system issues the operation command, the control system will automatically send the operation command again. If the circuit breaker still does not perform the operation, the control system will automatically send an alarm message to the monitoring center. The following operations will also be done: if the circuit breaker is an incoming line or a bus tie, the system will lock the program. If the circuit breaker is feed-out, the system will skip this circuit breaker and continue with other operations.

Second embodiment

This embodiment is mainly aimed at the control of the medium-voltage primary system of the four-way incoming power supply and one bus-connection shown in FIG. 2 . In this embodiment, both the first commercial power supply 31 and the second commercial power supply 41 are 10kV commercial power supplies. The first emergency power supply 32 and the second emergency power supply 42 are generator power supply, UPS power supply, solar power generation power supply or water power generation power supply, the first bus 1, the second bus 2, the first commercial power Power supply 32, second mains power supply 41, second emergency power supply 42, first feed-out circuit breaker 8, second feed-out circuit breaker 9, first mains incoming circuit breaker 51, first emergency incoming circuit breaker The breaker 52, the second mains incoming circuit breaker 61, the second emergency incoming circuit breaker 62, and the bus tie circuit breaker 7 are connected to the PLC controller 10 through respective second control cables.

Referring to Figure 5, when the control system of this embodiment performs automatic switching control of medium-voltage power transmission and distribution, it includes steps:

S100, switch on the medium-voltage power transmission and distribution automatic switching control system, put the first incoming power supply and the second incoming power supply into operation, and make the bus tie circuit breaker in the opening state;

S200, respectively collect the voltages of the first incoming power supply, the second incoming power supply, the first busbar and the second busbar, and at the same time collect the voltages of the first incoming line circuit breaker, the second incoming line circuit breaker, and the first outgoing line Status signals of the circuit breaker and the circuit breaker for the second outfeed;

S300, judging whether automatic switching is required according to the collected voltage and status signals, if not, return to step S200 or give an alarm; if automatic switching is required, proceed to step S400;

S400, for automatic switching.

Specifically, it is divided into the following situations:

(1) Under normal circumstances (the first mains power supply 31 and the second mains power supply 41 are charged, the first mains incoming circuit breaker 51 and the second mains incoming circuit breaker 61 are closed, the first emergency incoming line Circuit breaker 52, second emergency incoming line circuit breaker 62 and bus tie circuit breaker 7 opening positions): remote operation of closing or opening of incoming line, bus tie and feeder in the system can be performed.

(2) One line of mains incoming power supply (the first mains power supply 31) loses power: automatically disconnect the de-energized incoming circuit breaker (the first mains incoming circuit breaker 51), and then disconnect the de-energized bus at the same time All the feed-out circuit breakers (the first feed-out circuit breaker 8) of the section (the first bus 1), close the bus tie circuit breaker 7, and then close all the feed-out circuit breakers that were disconnected in the early stage according to the procedure. Specifically, in step S300, if the voltage of the first commercial power supply in the first incoming power supply/the first commercial power supply in the second incoming power supply is less than a set value (such as zero), it is judged If automatic switching is required, proceed to step S402: disconnect the first mains incoming circuit breaker in the first incoming line circuit breaker/the second mains incoming line circuit breaker in the second incoming line circuit breaker and all first mains incoming circuit breakers Outgoing circuit/second outgoing circuit, then close the bus tie circuit breaker, and then close the disconnected first outgoing circuit/second outgoing circuit circuit breaker/second feeding circuit breaker in sequence according to a set sequence Use circuit breaker.

(3) In the case of two-way mains power failure: automatically disconnect the incoming circuit breaker (the first mains incoming circuit breaker 51, the second mains incoming circuit breaker 61), and then disconnect all feeders at the same time. Out of circuit breakers 8, 9 and bus tie circuit breaker 7, at the same time send the generator start signal, after receiving the generator parallel completion signal, close the first emergency incoming line circuit breaker 52 and the second emergency incoming line circuit breaker 62, and then close the feeder circuit in turn according to the program requirements. Specifically, in step S300, if the voltages of the first commercial power supply in the first incoming power supply and the first commercial power supply in the second incoming power supply are both less than a set value (such as zero), If it is judged that automatic switching is required, proceed to step S403: disconnect the first mains incoming circuit breaker in the first incoming line circuit breaker, the second mains incoming line circuit breaker in the second incoming line circuit breaker, and all the second mains incoming circuit breakers. The first outgoing line circuit, the second outgoing line circuit, and then close the bus tie circuit breaker, and at the same time send the emergency power start signal, close the first emergency incoming line circuit breaker and the second emergency incoming line circuit breaker, and then close them in sequence according to a set sequence The circuit breaker for the first feed-out on the first outlet circuit and the circuit breaker for the second feed-out on the second outlet circuit.

(4) During normal operation, in case of bus failure: automatically disconnect all feed-out circuits and incoming line switches on the faulty bus. Specifically, in step S300, if the voltage of the first commercial power supply in the first incoming power supply is within a normal range, if the voltage of the second commercial power supply in the second incoming power supply is within a normal range , the voltage of the first busbar is less than a set value (for example, zero), and when the voltage of the second busbar is less than a set value (for example, zero), it is judged that automatic switching is required, and then proceed to step S406: disconnection Turn on all circuit breakers.

(5) One line of mains power failure (such as the first mains power supply 31), and the other busbar (such as the second busbar 2) fails:

Power failure first and then failure: power failure first and then handle according to (2). In this case, if another bus fails, the second mains incoming circuit breaker 61 and bus tie circuit breaker 7 of the faulty incoming line will be disconnected first. And all feed-in circuits, send the generator start signal, close the first emergency incoming circuit breaker 52 after the parallel machine is completed, and then close the outgoing circuit on the first bus 1 in sequence according to the procedure.

Fault first and then power loss: the fault will be dealt with according to ⑷. In this case, if another section of the incoming line loses power, the system will first disconnect the power-off incoming line circuit breaker and all feed-in circuits, and at the same time send the generator to start After the parallel machine is completed, close the first emergency incoming line circuit breaker 52, and then close the outgoing line circuit on the first road bus 1 in sequence according to the program.

The specific steps are: in step S300, if the voltage of the second commercial power supply in the second incoming power supply is less than a set value, the voltage of the first commercial power supply in the first incoming power supply is within a normal value range , when the voltage of the first busbar is less than a set value or/and the state signal of the first incoming circuit breaker is abnormal, it is judged that automatic switching is required, and then proceed to step S405: disconnect the second incoming circuit breaker The second mains incoming line circuit breaker and all the first outgoing line circuit and the second outgoing line circuit, then send the emergency power start signal, close the second emergency incoming line circuit breaker, and then close the disconnected first line circuit breaker in sequence according to a set sequence The second feed-out circuit breaker on the second-outlet circuit.

(6) When the emergency power supply (such as diesel generator) is running and the diesel generator fails:

Generally, the control system with diesel generators will have multiple sets of generators, and each set will send a running signal to the PLC controller. When the diesel generator fails, the PLC controller will receive the number of faulty machines and will The quantity is graded according to the program to disconnect the quantity of feed-in circuits successively, so as to ensure the power consumption demand of important loads.

Specifically, after the two mains power failures, steps are also included:

S310, collecting the emergency power supply signal and judging whether the first emergency power supply or/and the second emergency power supply is faulty according to the emergency power supply signal, if the first emergency power supply or/and the second emergency power supply are faulty, sending the emergency power supply failure signal, and then Proceed to step S410: according to the failure of the emergency power supply and the predetermined load shedding scheme, cut off the corresponding outlet circuit.

After one line of mains loses power and another line of bus fails, it also includes steps:

S320, collecting the emergency power supply signal and judging whether the first emergency power supply has a fault according to the emergency power supply signal, if the first emergency power supply has a fault, then sending the emergency power supply failure signal, and then proceed to step S420: according to the failure of the first emergency power supply According to the situation and the pre-determined load shedding scheme, cut off the corresponding outgoing circuit;

Or S330, collecting the emergency power supply signal and judging whether the second emergency power supply is faulty according to the emergency power supply signal, if the second emergency power supply is faulty, then sending the emergency power supply failure signal, and then proceed to step S430: According to the situation and the pre-determined load shedding scheme, cut off the corresponding outgoing circuit.

(7) When the mains power supply is restored:

After one line of mains power failure recovers: first disconnect all the feed-out circuits and bus couplers on the power-off bus, close the breaker of the power-off incoming line, and then close the feed-out circuits in sequence according to the procedure.

In the case of emergency power supply, there is one line of mains recovery: first send the generator stop command, and at the same time disconnect the first emergency incoming circuit breaker 52, the second emergency incoming circuit breaker 62 and the bus circuit breaker 7. Close the mains incoming circuit breaker (the first mains incoming circuit breaker 51, the second mains incoming circuit breaker 61), detect that the incoming circuit breaker is not in position for power restoration, and close the bus tie circuit breaker .

(8) In order to prevent the circuit breaker from closing and opening after the system issues an operation command, the controller will automatically send the operation command again. If the circuit breaker still does not perform the operation, the system will automatically send an alarm message to the monitoring center, and will Do the following operations: If the circuit breaker is an incoming line or a bus tie, the system will lock the program. If the circuit breaker is feed-out, the system will skip this circuit breaker and continue with other operations.

third embodiment

This embodiment is mainly aimed at the control of the medium-voltage primary system of the six-way incoming power supply and one bus-connection shown in FIG. 3 . In this embodiment, both the first commercial power supply 31 and the second commercial power supply 41 are 10kV commercial power supplies. Two first emergency power supplies 32 are generator power supply, UPS power supply, solar power generation power supply or water power generation power supply, and the two first emergency power supplies can be the same or different; two second emergency power supplies 32 are generator power supply, UPS power supply power supply, solar power supply or water power supply, and the two second emergency power supplies can be the same or different. The first bus 1, the second bus 2, the first mains power supply 31, the two first emergency power supplies 32, the second mains power supply 41, the two second emergency power supplies 42, the first feed-out circuit breaker 8 , the second feed-out circuit breaker 9, the first mains incoming circuit breaker 51, the first emergency incoming circuit breaker 52, the second mains incoming circuit breaker 61, the second emergency incoming circuit breaker 62 and the bus tie The circuit breakers 7 are respectively connected to the PLC controller 10 through respective second control lines.

For the detailed control method of six incoming lines and one bus tie, refer to the control of four incoming lines and one bus tie. The difference is that there are priorities in automatic switching. Specifically, in step S403, close the first The emergency incoming line circuit breaker and the second emergency incoming line circuit breaker include the steps of: closing at least one of the multiple first emergency incoming line circuit breakers according to the priority and closing the multiple second emergency incoming line circuit breakers according to the priority at least one of the line breakers. In step S404, when switching on the first emergency incoming circuit breaker, it includes the step of: switching on at least one of the plurality of first emergency incoming circuit breakers according to priority. In step S405, when closing the second emergency incoming circuit breaker, it includes the step of: closing at least one of the plurality of second emergency incoming circuit breakers according to the priority.

The above are just a few preferred embodiments. For the control system of one bus connection with eight lines of incoming lines (three lines for the first emergency power supply and three lines for the second emergency power supply), ten lines of incoming lines (three lines for the first emergency power supply) It is four-way, and the second emergency power supply is four-way) the control system of one way bus tie, etc. are all similar to the above, and will not give examples one by one here.

And, in order to ensure reliability, the utility model adopts two sets of PLC controllers to carry out redundant operation, that is to say, one set of PLC controllers is used as the main processor, and the other set of PLC controllers is used as the slave processor. , the main processor executes the program, controls the I/O device, and the slave processor constantly monitors the state of the main processor. If the master processor fails, the slave processor will immediately take over the control of I/O and continue to execute the program, thus realizing redundant control of the system.

Referring again to FIG. 4 , the PLC controller 10 in the present invention is connected to an electric power monitoring system 200 through a control cable (for distinction, the control cable here is also called a third control cable). The PLC controller 10 is connected to a UPS power supply 20, and the UPS power supply 20 is arranged in the control cabinet 100 to supply power to the PLC controller 10. The automatic switching control system for medium-voltage power transmission and distribution of the present invention also includes steps : the PLC controller 10 uploads the collected voltages and state signals to the power monitoring system. That is to say, the information in the PLC controller 10 can be uploaded to the power monitoring system, and the PLC controller 10 can also receive commands from the power monitoring system through the network.

In the utility model, the PLC controller selects Siemens PLC412-5H.

Of course, the utility model can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the utility model without departing from the spirit and essence of the utility model, but These corresponding changes and deformations should all belong to the protection scope of the appended claims of the present utility model.

Claims (5)

1. press power transmission and distribution automatic switching control system in one kind, for middle pressure primary system, described middle pressure primary system comprises first via bus, the second road bus, the first incoming power, the second incoming power and bus, described first via bus is connected with multiple first transmission line circuit, each first transmission line circuit is provided with one first and feeds out with circuit breaker; Described second road bus is connected with multiple second transmission line circuit, each second transmission line circuit is provided with one second and feeds out with circuit breaker; Described first incoming power is connected with described first via bus by one first lead-in circuit breaker; Described second incoming power is connected with described second road bus by one second lead-in circuit breaker; It is characterized in that, described middle pressure power transmission and distribution automatic switching control system comprises:

Control rack, its cabinet is arranged the select button of touch-screen and switching/releasing; And

PLC, is arranged in described control rack, is connected with described touch-screen by communication cable, and controls cable with described select button by first and be connected;

Wherein, described PLC controls cable by second and feeds out with described first via bus, described second road bus, described first incoming power, described second incoming power, described first respectively to feed out with circuit breaker, described second and be connected with circuit breaker, described first lead-in circuit breaker, described second lead-in circuit breaker and described bus, with according to their state to described first incoming power, described second incoming power, described first transmission line circuit, described second transmission line circuit or/and described bus closes a floodgate or sub-switching operation.

2. middle pressure power transmission and distribution automatic switching control system according to claim 1, is characterized in that, described PLC controls cable by the 3rd and is connected with an electric power monitoring system.

3. middle pressure power transmission and distribution automatic switching control system according to claim 1 and 2, it is characterized in that, described PLC is two covers.

4. middle pressure power transmission and distribution automatic switching control system according to claim 1 and 2, it is characterized in that, described PLC connects a ups power, and described ups power is arranged in described control rack.

5. middle pressure power transmission and distribution automatic switching control system according to claim 1 and 2, it is characterized in that, described first incoming power comprises first mains supply of a 6-35kV and at least one first emergency power supply, described second incoming power comprises second mains supply of a 6-35kV and at least one second emergency power supply, described first lead-in circuit breaker comprises the first civil power lead-in circuit breaker and the first emergent lead-in circuit breaker, described second lead-in circuit breaker comprises the second civil power lead-in circuit breaker and the second emergent lead-in circuit breaker, described first mains supply, described first emergency power supply, described second mains supply, described second emergency power supply, described first civil power lead-in circuit breaker, described first emergent lead-in circuit breaker, described second civil power lead-in circuit breaker, described second emergent lead-in circuit breaker controls cable by each self-corresponding second and is connected with described PLC.