A lighting control system for long distance large factory building

Abstract

A kind of lighting control system of long distance large workshop, including host computer, control unit and multiple lighting control boxes, the host computer is located in control room, control unit is located in electrical room, multiple lighting control boxes are evenly distributed in workshop site, wherein, the lighting control box is divided into nearby lighting control box and remote lighting control box according to the distance from electrical room, the host computer is connected with control unit, the control unit is connected with nearby lighting control box, nearby lighting control box is connected with remote lighting control box, and nearby lighting control box and remote lighting control box are connected with several lighting fixtures.

Description

Technical Field

[0001] This utility model relates to the field of factory lighting control technology, specifically to a lighting control system suitable for long-distance large factory buildings. Background Technology

[0002] For long-distance, large-scale factory lighting systems, lighting control boxes are often evenly distributed on-site to facilitate operation. However, the distance between each lighting control box is relatively far, and manually turning the lighting switches on and off consumes a lot of manpower. Utility Model Content

[0003] In view of the technical defects and drawbacks existing in the prior art, this utility model provides a lighting control system suitable for long-distance large factory buildings that overcomes or at least partially solves the above problems. The specific solution is as follows:

[0004] A lighting control system for a long-distance large factory building includes a host computer, a control unit, and multiple lighting control boxes. The host computer is located in a control room, the control unit is located in an electrical room, and the multiple lighting control boxes are evenly distributed throughout the factory site. The lighting control boxes are divided into nearby lighting control boxes and remote lighting control boxes according to their distance from the electrical room. The host computer is connected to the control unit, the control unit is connected to the nearby lighting control boxes, the nearby lighting control boxes are connected to the remote lighting control boxes, and each of the nearby and remote lighting control boxes is connected to several lighting fixtures.

[0005] Furthermore, the host computer is a host computer of MCGS or WINCC system. The host computer of MCGS or WINCC system is equipped with a unified light-on button, a unified light-off button and multiple independently controlled light-on / off buttons. The display interface of MCGS or WINCC system is also equipped with a pop-up window for adjusting the light-on / off time.

[0006] Furthermore, the control unit is a programmable logic controller (PLC).

[0007] Furthermore, the lighting control box includes a signal transmission unit, a main circuit power supply unit, a control circuit unit, and a signal transfer unit; the signal transmission unit is connected to the control unit, the main circuit power supply unit is connected to several lighting fixtures, the control circuit unit is connected to both the signal transmission unit and the main circuit power supply unit, the signal transfer unit is connected to the signal transmission unit, and the signal transfer unit of the nearest lighting control box is also connected to the signal transmission unit of the remote lighting control box.

[0008] Furthermore, the main circuit power supply unit includes a main power molded case circuit breaker, multiple 3P contactors, and multiple 1P miniature circuit breakers. The input terminal of the main power molded case circuit breaker is connected to a three-phase power supply, and the output three-phase power is connected to three 1P miniature circuit breakers respectively. The three corresponding 1P miniature circuit breakers are connected to one 3P contactor. Among them, one 1P miniature circuit breaker is connected to one phase line of the 3P contactor, and the three 1P miniature circuit breakers are used to connect the three phase lines of the 3P contactor respectively. The three phase lines of each 3P contactor are connected to three sets of lamps respectively. The main power molded case circuit breaker, the three 1P miniature circuit breakers, and the 3P contactor connected in sequence form a main circuit.

[0009] Furthermore, the control circuit unit includes a control power supply, a selector switch, and multiple local control circuits corresponding one-to-one with the main circuit. Each local control circuit includes a light-on button, a light-off button, and an indicator light. The input terminal of the control power supply is connected to one phase of the main circuit power supply unit, and the output terminal is connected to the input terminal of the selector switch. The first output terminal of the selector switch is sequentially connected to the light-on button, the light-off button, and the coil of a 3P contactor of the corresponding main circuit. The indicator light is connected in parallel with the coil of the 3P contactor.

[0010] Furthermore, the system also includes multiple remote control circuits corresponding one-to-one with the main circuit and the local control circuit. Each remote control circuit includes two intermediate relay contacts controlled by the control unit, namely a light-on intermediate relay contact and a light-off intermediate relay contact. The second output terminal of the selector switch is connected in sequence to the light-on intermediate relay contact and the light-off intermediate relay contact in the remote control circuit, and then connected to the node between the light-on button and the light-off button of the corresponding local control circuit. The node between the two intermediate relay contacts of the remote control circuit is also connected to one end of the normally open contact of a 3P contactor corresponding to a main circuit. The other end of the normally open contact of the 3P contactor is connected to the input terminal of the selector switch.

[0011] Furthermore, the signal switching unit includes a first signal switching unit, which includes multiple switching on-light circuits and multiple switching off-light circuits corresponding one-to-one with the remote control circuits of the remote lighting control box. Each switching on-light circuit and each switching off-light circuit includes a switching intermediate relay. The switching intermediate relay of each switching on-light circuit is connected to the output terminal of the control power supply through an intermediate relay contact that controls the remote lighting control box to turn on via a corresponding control circuit. The switching intermediate relay of each switching off-light circuit is connected to the output terminal of the control power supply through an intermediate relay contact that controls the remote lighting control box to turn off via a corresponding control circuit.

[0012] Furthermore, the signal switching unit also includes a second signal switching unit, which includes a switching main circuit closing circuit, a switching remote selection circuit, and multiple switching a-phase lamp lighting circuits, multiple switching b-phase lamp lighting circuits, and multiple switching c-phase lamp lighting circuits corresponding one-to-one with the main circuit. The switching main circuit closing circuit includes a switching main circuit closing intermediate relay, which is connected to the output terminal of the control power supply sequentially through the normally open contact of the miniature circuit breaker of the remote lighting control box control circuit and the normally open contact of the main power molded case circuit breaker. The switching remote selection circuit includes... A remote selection intermediate relay is provided, which is connected to the output terminal of the control power supply through a normally open contact of the remote selection intermediate relay in the remote lighting control box. The transition circuits for phase A, phase B, and phase C lighting circuits each include a phase A, phase B, and phase C lighting intermediate relays in the remote lighting control box, respectively. Each of these intermediate relays is connected to the output terminal of the control power supply through a corresponding normally open contact of a remote lighting control box lighting intermediate relay.

[0013] Furthermore, the signal transmission unit includes a first signal transmission unit and a second signal transmission unit. The normally open contacts of the miniature circuit breaker in each control circuit, the normally open contacts of the main power molded case circuit breaker, the normally open contacts of the remote selection intermediate relay, and the normally open contacts of the intermediate relays for each phase A, phase B, and phase C light-on circuit are all connected to the control unit through the first signal transmission unit. The normally open contacts of the transfer main circuit closing intermediate relay, the transfer remote selection intermediate relay, and the multiple transfer phase A, phase B, and phase C light-on intermediate relays are connected to the control unit through the second signal transmission unit.

[0014] This utility model has the following beneficial effects:

[0015] This utility model provides a lighting control system for long-distance large factory buildings, which can individually control the required lighting fixtures through a host computer and control unit, or perform unified control of all lighting fixtures. Attached Figure Description

[0016] Figure 1 A connection diagram of a lighting control system for a long-distance large factory building provided for an embodiment of this utility model;

[0017] Figure 2 A schematic diagram showing the connection between a nearby lighting control box and a remote lighting control box provided for an embodiment of this utility model;

[0018] Figure 3A circuit diagram of the main circuit power supply unit of the lighting control box provided for an embodiment of this utility model;

[0019] Figure 4 A circuit diagram of the control circuit unit of the lighting control box provided in this embodiment of the utility model;

[0020] Figure 5 A circuit diagram of the first signal transfer unit of the lighting control box provided in this embodiment of the utility model;

[0021] Figure 6 Circuit diagram of the second signal transfer unit of the lighting control box provided in this embodiment of the utility model

[0022] Figure 7 A circuit diagram of the first signal transmission unit of the lighting control box provided in this embodiment of the utility model;

[0023] Figure 8 The circuit diagram of the second signal transmission unit of the lighting control box provided in this embodiment of the utility model. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the present utility model, and not all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] This utility model provides a lighting control system for a long-distance large factory building, mainly including a host computer, a control unit, and multiple lighting control boxes. The host computer is located in the control room, the control unit is located in the electrical room, and the multiple lighting control boxes are evenly distributed on the factory site. The lighting control boxes are divided into nearby lighting control boxes and remote lighting control boxes according to their distance from the electrical room. The host computer is connected to the control unit, the control unit is connected to the nearby lighting control box, the nearby lighting control box is connected to the remote lighting control box, and both the nearby and remote lighting control boxes are connected to several lighting fixtures.

[0026] See Figure 1 As shown, 1 is the host computer, 2 is the control unit, 3 and 4 are two nearby lighting control boxes, 5 and 6 are two remote lighting control boxes, and 7 is the lighting fixture. Lighting control boxes 3 and 4 are closer to the electrical room, while lighting control boxes 5 and 6 are farther from the electrical room. The lighting fixtures 7 are evenly distributed throughout the factory building, and each lighting control box controls the same number of lighting fixtures.

[0027] The host computer is an MCGS or WINCC system host computer, which is equipped with a unified light-on button, a unified light-off button, multiple independently controlled light-on / off buttons, and multiple independently controlled light-on / off time setting knobs; the control unit is a programmable logic controller (PLC).

[0028] Operators can manually switch lights on and off for each circuit in the four lighting control boxes on the screen, or set on / off times for automatic switching after the set time. The screen also displays the power gain / loss information for each circuit's three phases. Control unit 2 uses a Schneider 340 PLC with corresponding terminal blocks and a 24V intermediate relay, connecting to the host computer 1 and lighting control boxes 3 and 4 for bidirectional signal transmission. Control unit 2 is not directly connected to lighting control boxes 5 and 6; signal transmission is handled through lighting control boxes 3 and 4.

[0029] See Figure 2 As shown, the lighting control box includes a signal transmission unit, a main circuit power supply unit, a control circuit unit, and a signal transfer unit. The signal transmission unit is connected to the control unit, the main circuit power supply unit is connected to several lighting fixtures, the control circuit unit is connected to both the signal transmission unit and the main circuit power supply unit, and the signal transfer unit is connected to the signal transmission unit. The signal transfer unit of the nearest lighting control box is also connected to the signal transmission unit of the remote lighting control box.

[0030] Based on the lighting control system for long-distance large factory buildings provided by this utility model, the control unit can transmit signals bidirectionally between the host computer and the lighting control box. The operation signals of the operator on the host computer are transmitted to the control unit, and the control unit then transmits the switching command signals of the lighting fixtures to the lighting control box. The lighting control box then controls the switching of the relevant lighting fixtures based on the switching command signals.

[0031] In addition, the lighting control box of this utility model can also feed back the power gain and loss information of the corresponding circuit to the control unit and display the information through the host computer; and the lighting control box of this utility model is equipped with a signal transfer unit in the nearby lighting control box, and the distant lighting control box is not directly connected to the control unit, but is connected to the signal transfer unit of the nearby lighting control box to achieve bidirectional signal transmission.

[0032] Preferably, the main circuit power supply unit includes a main power molded case circuit breaker, multiple 3P contactors, and multiple 1P miniature circuit breakers. The input terminal of the main power molded case circuit breaker is connected to a three-phase power supply, and the output three-phase power is connected to three 1P miniature circuit breakers respectively. The three corresponding 1P miniature circuit breakers are connected to one 3P contactor. Among them, one 1P miniature circuit breaker is connected to one phase line of the 3P contactor, and the three 1P miniature circuit breakers are used to connect the three phase lines of the 3P contactor respectively. The three phase lines of each 3P contactor are connected to three sets of lamps respectively. The main power molded case circuit breaker, the three 1P miniature circuit breakers, and the 3P contactor connected in sequence form a main circuit.

[0033] See Figure 3 As shown, the lighting control box is divided into three main circuits, and each main circuit is further divided into three branches according to the three-phase voltage (a, b, c). Q100 is the main power molded case circuit breaker (MCCB), a 3P circuit breaker capable of controlling the three-phase power supply. Q101-Q109 are 1P miniature circuit breakers. KM11-KM13 are 3P contactors. K11-K19 are intermediate relays for the main circuit. This embodiment includes three 3P contactors and nine 1P miniature circuit breakers. The main power molded case circuit breaker, three 1P miniature circuit breakers, and one 3P contactor connected in sequence form a main circuit, thus constituting three main circuits. The main power... The main circuit consists of molded case circuit breaker Q100, 1P miniature circuit breakers Q101-Q103, and 3P contactor KM11. The main circuit consists of main power supply molded case circuit breaker Q100, 1P miniature circuit breakers Q104-Q106, and 3P contactor KM12. The main circuit consists of main power supply molded case circuit breaker Q100, 1P miniature circuit breakers Q107-Q109, and 3P contactor KM13. K11-K13 are the main circuit intermediate relays for phases a, b, and c of main circuit one, respectively. K14-K16 are the main circuit intermediate relays for phases a, b, and c of main circuit two, respectively. K17-K19 are the main circuit intermediate relays for phases a, b, and c of main circuit three, respectively.

[0034] Preferably, the control circuit unit includes a control power supply, a selector switch, and multiple local control circuits corresponding one-to-one with the main circuit. Each local control circuit includes a light-on button, a light-off button, and an indicator light. The input terminal of the control power supply is connected to one phase of the main circuit power supply unit, and the output terminal is connected to the input terminal of the selector switch. The first output terminal of the selector switch is sequentially connected to the light-on button, the light-off button, and the coil of a 3P contactor of the corresponding main circuit. The indicator light is connected in parallel with the coil of the 3P contactor.

[0035] The system also includes multiple remote control circuits corresponding one-to-one with the main circuit and the local control circuit. Each remote control circuit includes two intermediate relay contacts controlled by the control unit, namely a light-on intermediate relay contact and a light-off intermediate relay contact. The second output terminal of the selector switch is connected in sequence to the light-on intermediate relay contact and the light-off intermediate relay contact in the remote control circuit, and then connected to the node between the light-on button and the light-off button of the corresponding local control circuit. The node between the two intermediate relay contacts of the remote control circuit is also connected to one end of the normally open contact of a 3P contactor corresponding to a main circuit. The other end of the normally open contact of the 3P contactor is connected to the input terminal of the selector switch.

[0036] See Figure 4 The diagram shown is a circuit schematic of a control loop unit provided in an embodiment of this utility model. It includes three local control loops and three remote control loops. Q21 is a miniature circuit breaker for the control loop; SA21 is a local / remote selector switch used to switch between local and centralized control; S21, S23, and S25 are buttons for turning on the lights; S22, S24, and S26 are buttons for turning off the lights; K21 is a remote selection intermediate relay coil; and K01 to K06 are contacts of intermediate relays controlled by the control unit. Specifically, K01, K03, and K05 are contacts for turning on the lights, and K02, K04, and K06 are contacts for turning off the lights. Normally, the contacts for turning on the lights are normally open, and the contacts for turning off the lights are normally closed. Each contactor coil is connected in parallel with an indicator light. These three indicator lights indicate whether the contactors in the three main circuits are engaged. Figure 4 In the middle, K01 to K06 come from the control unit.

[0037] Preferably, the signal switching unit includes a first signal switching unit, which includes multiple switching on-light circuits and multiple switching off-light circuits corresponding one-to-one with the remote control circuits of the remote lighting control box. Each switching on-light circuit and switching off-light circuit includes a switching intermediate relay. The switching intermediate relay of each switching on-light circuit is connected to the output terminal of the control power supply through an intermediate relay contact that controls the remote lighting control box to turn on via a corresponding control circuit. The switching intermediate relay of each switching off-light circuit is connected to the output terminal of the control power supply through an intermediate relay contact that controls the remote lighting control box to turn off via a corresponding control circuit.

[0038] See Figure 5The diagram shown is a circuit diagram of the first signal switching unit of the signal switching unit provided in this embodiment of the present invention. It includes three switching circuits for turning on the lights and three switching circuits for turning off the lights. K31 to K36 are intermediate relays for the corresponding circuits. K22 to K27 are contacts of intermediate relays controlled by the control unit. K22, K24 and K26 are intermediate relay contacts for controlling the remote lighting control box to turn on the lights. K23, K25 and K27 are intermediate relay contacts for controlling the remote lighting control box to turn on the lights. Under normal conditions, K22 to K27 are all normally open contacts.

[0039] Preferably, the signal switching unit further includes a second signal switching unit, which includes a switching main circuit closing circuit, a switching remote selection circuit, and multiple switching a-phase lamp lighting circuits, multiple switching b-phase lamp lighting circuits, and multiple switching c-phase lamp lighting circuits corresponding one-to-one with the main circuit. The switching main circuit closing circuit includes a switching main circuit closing intermediate relay, which is connected to the output terminal of the control power supply sequentially through the normally open contact of the miniature circuit breaker of the remote lighting control box control circuit and the normally open contact of the main power molded case circuit breaker. The switching remote selection circuit includes a switching remote selection intermediate relay, which is connected to the output terminal of the control power supply through the remote lighting control box control circuit. The normally open contact of the remote selection intermediate relay of the control box is connected to the output terminal of the control power supply. The switching circuits for phase A, phase B, and phase C lighting respectively include intermediate relays for phase A, phase B, and phase C lighting in the remote lighting control box. Each of these intermediate relays is connected to the output terminal of the control power supply through a corresponding normally open contact of the remote lighting control box intermediate relay. The normally open contacts of the miniature circuit breaker, the main power molded case circuit breaker, and the multiple normally open contacts of the intermediate relays are all connected to the control unit, which controls their opening and closing.

[0040] Figure 5 and Figure 6 Together, they constitute the signal transfer unit of the lighting control box, mainly composed of several 220V intermediate relays. Their 220V power supply is taken from the control circuit unit. Taking lighting control box 3 as an example, it is responsible for transferring signals from lighting control box 5. Figure 4 The relay signal consists of the switch signals for the three main circuits sent by control unit 2. Figure 5 The relay signals are the centralized control signal fed back from the lighting control box 5 and the power supply signals of the 9 branches;

[0041] See Figure 5As shown, it includes three switching light-on circuits and three switching light-off circuits. K31 to K36 are intermediate relays for the corresponding circuits, and K22 to K27 are the contacts of the intermediate relays controlled by the control unit. Figure 5 In the middle, K22 to K27 come from the control unit.

[0042] See Figure 6 As shown, it includes: one main circuit closing circuit, one remote selection circuit, three phase A lighting circuits, three phase B lighting circuits, and three phase C lighting circuits. Specifically, Q21 is the normally open contact of the miniature circuit breaker in the remote lighting control box control circuit; Q100 is the normally open contact of the main power molded case circuit breaker in the remote lighting control box; K401 is the intermediate relay for closing the main circuit; K402 is the intermediate relay for remote selection; K21 is the normally open contact of the intermediate relay for remote selection in the remote lighting control box; K403, K404, and K405 are the intermediate relays for phase A, phase B, and phase C lighting in circuit one, respectively; and K11, K12, and K13 are the normally open contacts of the intermediate relays for phase A, phase B, and phase C lighting in circuit one of the remote lighting control box, respectively. Points; K406, K407, and K408 are the intermediate relays for phase A, phase B, and phase C of the lamp illumination circuit in transfer circuit two, respectively; K14, K15, and K16 are the normally open contacts of the intermediate relays for phase A, phase B, and phase C of the lamp illumination circuit in circuit two of the remote lighting control box, respectively; K409, K410, and K411 are the intermediate relays for phase A, phase B, and phase C of the lamp illumination circuit in transfer circuit three, respectively; K17, K18, and K19 are the normally open contacts of the intermediate relays for phase A, phase B, and phase C of the lamp illumination circuit in circuit three of the remote lighting control box, respectively. Figure 6 Q100, Q21, and K11 to K19 in the diagram come from the transition lighting control box, i.e., the remote lighting control box.

[0043] Preferably, the signal transmission unit includes a first signal transmission unit and a second signal transmission unit. The normally open contacts of the miniature circuit breaker, the normally open contacts of the main power molded case circuit breaker, the normally open contacts of the remote selection intermediate relay, and the normally open contacts of the intermediate relays for the multiple phase A, phase B, and phase C light-on circuits are all connected to the control unit through the first signal transmission unit. The normally open contacts of the transfer main circuit closing intermediate relay, the transfer remote selection intermediate relay, and the multiple transfer phase A, phase B, and phase C light-on intermediate relays are connected to the control unit through the second signal transmission unit.

[0044] See Figure 7-8The image shows the signal transmission unit of the lighting control box provided in this embodiment of the present invention. Figure 7 The grades Q100, Q21, K21, K11-K19 are... Figure 3 and Figure 4 Normally open contacts of each component; Figure 8 K401 to K411 are Figure 6 The normally open contact of the corresponding intermediate relay, Figure 7 and Figure 8 The circuit closing signals, centralized control signals, and power-on signals of a total of 18 branches from lighting control boxes 3 and 5 are respectively fed back to control unit 2. Figure 7 The Q100, Q21, and K11-K19 components are located in the nearest lighting control box, i.e., this lighting control box. Figure 8 K401 to K411 in the picture also come from the local lighting control box.

[0045] The main working principle of this utility model is as follows:

[0046] Taking the lighting control of circuit 1 in lighting control box 5 as an example, the operator clicks the light-on button of circuit 1 in lighting control box 5 on the WINCC screen of the host computer 1. After receiving this operation information, control unit 2 outputs a 24V logic signal for the light-on command, which is then converted into a passive dry contact closing signal by the internal 24V intermediate relay. This passive dry contact closing signal is then transmitted to the signal transfer unit of lighting control box 3, which drives the corresponding transfer intermediate relay to be energized, causing the normally open contact to close. This normally open contact closing signal is then transmitted to the control circuit unit of lighting control box 5, which drives the contactor coil of circuit 1 to be energized, causing the contactor of circuit 1 to engage, thereby realizing the entire process of turning on the light. After the three phases (abc) of circuit 1 in lighting control box 5 are energized, the corresponding lamp-lighting intermediate relay in drive circuit 1 is energized, and its normally open contact closes. This signal is then fed back to the signal transfer unit of lighting control box 3 to drive the corresponding transfer intermediate relay to energize, causing its normally open contact to close. Afterwards, the signal transmission unit of lighting control box 3 feeds back the normally open contact closure signal of the corresponding transfer intermediate relay to control unit 2. After receiving the signal, control unit 2 processes the logic and sends the variable corresponding to the energization information of the three phases (abc) of circuit 1 in lighting control box 5 to host computer 1. Then, the energization information of the three phases (abc) of circuit 1 in lighting control box 5 can be displayed on the WINCC screen of host computer 1.

[0047] Although this document frequently uses terms such as host computer, control unit, relay, circuit breaker, and contactor, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model. Furthermore, the claimed solution of this utility model lies in the selection and connection relationship of various hardware devices, and those skilled in the art, upon learning of the hardware solution of this application, can obtain the corresponding program without any objection. Therefore, the claimed solution of this application does not involve any improvement of the program.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lighting control system for a long distance large factory building, characterized by, The system includes a host computer, a control unit, and multiple lighting control boxes. The host computer is located in the control room, the control unit is located in the electrical room, and the multiple lighting control boxes are evenly distributed throughout the factory. The lighting control boxes are divided into nearby lighting control boxes and remote lighting control boxes according to their distance from the electrical room. The host computer is connected to the control unit, the control unit is connected to the nearby lighting control box, and the nearby lighting control box is connected to the remote lighting control box. There is no direct connection between the control unit and the remote lighting control box; signal transmission is relayed through the nearby lighting control box. Both the nearby and remote lighting control boxes are connected to several lighting fixtures. The lighting control box includes a signal transmission unit, a main circuit power supply unit, a control circuit unit, and a signal transfer unit. The signal transmission unit is connected to the control unit, the main circuit power supply unit is connected to several lighting fixtures, the control circuit unit is connected to both the signal transmission unit and the main circuit power supply unit, and the signal transfer unit is connected to the signal transmission unit. The signal transfer unit of the nearest lighting control box is also connected to the signal transmission unit of the remote lighting control box. The main circuit power supply unit includes a main power molded case circuit breaker, multiple 3P contactors, and multiple 1P miniature circuit breakers. The input terminal of the main power molded case circuit breaker is connected to a three-phase power supply, and the output three-phase power is connected to three 1P miniature circuit breakers respectively. The three 1P miniature circuit breakers are connected to one 3P contactor. Each 1P miniature circuit breaker is connected to one phase of the 3P contactor, and the three 1P miniature circuit breakers are used to connect to the three phases of the 3P contactor respectively. The three phases of each 3P contactor are connected to three sets of lamps respectively. The main power molded case circuit breaker, the three 1P miniature circuit breakers, and the 3P contactor connected in sequence form a main circuit. The control circuit unit includes a control power supply, a selector switch, and multiple local control circuits corresponding to the main circuit. Each local control circuit includes a light-on button, a light-off button, and an indicator light. The input terminal of the control power supply is connected to one phase of the main circuit power supply unit, and the output terminal is connected to the input terminal of the selector switch. The first output terminal of the selector switch is sequentially connected to the light-on button, the light-off button, and the coil of a 3P contactor in the corresponding main circuit. The indicator light is connected in parallel with the coil of the 3P contactor. The system also includes multiple remote control circuits corresponding one-to-one with the main circuit and the local control circuit. Each remote control circuit includes two intermediate relay contacts controlled by the control unit, namely a light-on intermediate relay contact and a light-off intermediate relay contact. The second output terminal of the selector switch is connected in sequence to the light-on intermediate relay contact and the light-off intermediate relay contact in the remote control circuit, and then connected to the node between the light-on button and the light-off button of the corresponding local control circuit. The node between the two intermediate relay contacts of the remote control circuit is also connected to one end of the normally open contact of a 3P contactor corresponding to a main circuit. The other end of the normally open contact of the 3P contactor is connected to the input terminal of the selector switch.

2. The lighting control system for long-distance large factory buildings according to claim 1, characterized in that, The host computer is an MCGS or WINCC system host computer. The MCGS or WINCC system host computer is equipped with a unified light-on button, a unified light-off button and multiple independently controlled light-on / off buttons. The MCGS or WINCC system display interface is also equipped with a pop-up window for adjusting the light-on / off time.

3. The lighting control system for long-distance large factory buildings according to claim 1, characterized in that, The control unit is a programmable logic controller (PLC).

4. The lighting control system for long-distance large factory buildings according to claim 1, characterized in that, The signal switching unit includes a first signal switching unit. The first signal transfer unit includes multiple transfer-on lighting circuits and multiple transfer-off lighting circuits, each corresponding to a remote control circuit of the remote lighting control box. Each transfer-on lighting circuit and transfer-off lighting circuit includes a transfer intermediate relay. The intermediate relay of each transfer-on lighting circuit is connected to the output terminal of the control power supply through an intermediate relay contact that controls the remote lighting control box to turn on via a corresponding control circuit. The intermediate relay of each transfer-off lighting circuit is connected to the output terminal of the control power supply through an intermediate relay contact that controls the remote lighting control box to turn off via a corresponding control circuit.

5. The lighting control system for long-distance large factory buildings according to claim 4, characterized in that, The signal switching unit further includes a second signal switching unit, which includes a switching main circuit closing circuit, a switching remote selection circuit, and multiple switching phase a lamp lighting circuits, multiple switching phase b lamp lighting circuits, and multiple switching phase c lamp lighting circuits corresponding one-to-one with each main circuit. The switching main circuit closing circuit includes a switching main circuit closing intermediate relay, which is connected to the output terminal of the control power supply in sequence through the normally open contact of the miniature circuit breaker of the remote lighting control box control circuit and the normally open contact of the main power molded case circuit breaker. The remote selection circuit includes a remote selection intermediate relay, which is connected to the output of the control power supply via a normally open contact of the remote selection intermediate relay in the remote lighting control box. The a-phase lighting circuit, b-phase lighting circuit, and c-phase lighting circuit each include an a-phase lighting intermediate relay, a b-phase lighting intermediate relay, and a c-phase lighting intermediate relay in the remote lighting control box, respectively. Each of these relays is connected to the output of the control power supply via a normally open contact of a corresponding remote lighting control box lighting intermediate relay.

6. The lighting control system for long-distance large factory buildings according to claim 5, characterized in that, The signal transmission unit includes a first signal transmission unit and a second signal transmission unit. The normally open contacts of the miniature circuit breaker, the normally open contacts of the main power molded case circuit breaker, the normally open contacts of the remote selection intermediate relay, and the normally open contacts of the intermediate relays for the multiple phase A, phase B, and phase C light-on circuits are all connected to the control unit through the first signal transmission unit. The normally open contacts of the transfer main circuit closing intermediate relay, the transfer remote selection intermediate relay, and the multiple transfer phase A, phase B, and phase C light-on intermediate relays are connected to the control unit through the second signal transmission unit.

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