Prefabricated box transformer

Abstract

A prefabricated box transformer belongs to the technical field of power distribution, and in particular to a prefabricated box transformer. The present invention provides a prefabricated box transformer with good use effect. The present invention comprises a box body and a control circuit, wherein a high-voltage chamber (102), a transformer chamber and a control chamber are arranged in the box body, and the transformer chamber is provided with a transformer (1), and a ring network cabinet (2) is provided in the high-voltage chamber (102); the box body is two, and the two boxes are arranged in a transverse direction, and the front box body is provided with a first control chamber (103), a first transformer chamber (104), and a second transformer chamber (105) in sequence from front to back, and the rear box body is provided with a second control chamber (100), a third transformer chamber (101), and a high-voltage chamber (102) in sequence from front to back; the control circuit comprises a primary system part, a fire extinguisher and a safety trip control circuit, a transformer temperature control circuit, an electric energy monitoring part, a protection control circuit, a leakage protection module and a remote I / O module.

Description

Technical Field

[0001] The invention belongs to the technical field of power distribution, and in particular relates to a prefabricated box transformer. Background Art

[0002] The shield machine, whose full name is shield tunnel boring machine, is a special engineering machinery for tunnel excavation. It integrates optical, mechanical, electrical, hydraulic, sensor and information technology, and has the functions of excavating and cutting soil, conveying soil residue, assembling tunnel lining, measuring and guiding deviation correction, etc. Shield tunnel boring machines have been widely used in tunnel projects such as subways, railways, highways, municipal engineering, and hydropower. Shield machines are generally used in tunnels, mostly in warm, humid, muddy, earthquake-resistant environments, as well as rugged but simple environments.

[0003] The design of shield machine substation is usually suitable for 6-meter shield machines, and the box transformer capacity is only 2500KVA. With the continuous upgrading of shield machine equipment, conventional box transformers can no longer meet user needs. Summary of the invention

[0004] The present invention aims at solving the above problems and provides a prefabricated box transformer with good use effect.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme. The present invention comprises a box and a control circuit. A high-voltage chamber (102), a transformer chamber and a control chamber are arranged in the box. The present invention is characterized in that a transformer (1) is arranged in the transformer chamber, and a ring main unit (2) is arranged in the high-voltage chamber (102). There are two boxes, which are arranged in a transverse direction. The front box is arranged with a first control chamber (103), a first transformer chamber (104) and a second transformer chamber (105) in sequence from front to back, and the rear box is arranged with a second control chamber (100), a third transformer chamber (101) and a high-voltage chamber (102) in sequence from front to back.

[0006] The control circuit includes a primary system part, a fire extinguisher and safety trip control circuit, a transformer temperature control circuit, an electric energy monitoring part, a protection control circuit, a leakage protection module and a remote I / O module. The power ports of the fire extinguisher and safety trip control circuit are respectively connected to the power ports of the electric energy monitoring part, the power ports of the protection control circuit, the power ports of the leakage protection module and the power ports of the remote I / O module. The feedback signal output port of the primary system part is connected to the feedback signal input port of the remote I / O module, the control signal output port of the transformer temperature control circuit is connected to the control signal input port of the leakage protection module, the control signal output port of the electric energy monitoring part is connected to the control signal input port of the leakage protection module, the control signal output port of the protection control circuit is connected to the control signal input port of the fire extinguisher and safety trip control circuit, and the feedback signal output port of the leakage protection module is connected to the feedback signal input port of the remote I / O module.

[0007] As a preferred solution, the first control room (103) of the present invention is divided into two compartments from front to back, and a double door is arranged at the front end of each compartment; three sets of double doors are arranged at the front end of the first transformer room (104) and the second transformer room (105) from front to back;

[0008] The second control room (100) is divided into three compartments from front to back, each compartment is provided with a double door at the front end, and a plurality of mounting holes (3) are evenly distributed vertically on both sides of each compartment;

[0009] The front end of the third transformer room (101) is provided with three sets of double doors from front to back; the front end of the high-voltage room (102) is provided with a double door.

[0010] The invention has beneficial effects.

[0011] The present invention divides the transformers into three groups and places them in two box-type transformers, and at the same time reasonably arranges the control room and the high-voltage room to meet the requirements of equipment capacity and usage space. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. The protection scope of the present invention is not limited to the following description.

[0013] Figure 1 It is a schematic diagram of the rear box structure of the present invention.

[0014] Figure 2 It is a schematic diagram of the front box structure of the present invention.

[0015] Figure 3 This is a bottom view of the fan cover of the present invention.

[0016] Figure 4 It is a top view of the bottom of the box body of the present invention.

[0017] Figure 5 It is a top view of the rear side box of the present invention.

[0018] Figure 6 It is a top view of the front box body of the present invention.

[0019] Figure 7 This is a front view of the rear box body of the present invention.

[0020] Figure 8 This is a front view of the front box body of the present invention.

[0021] Fig. 9 This is a rear view of the rear side box of the present invention.

[0022] Fig.10 This is a rear view of the front box body of the present invention.

[0023] Fig.11 This is a primary system diagram of the present invention.

[0024] Fig.12 It is the fire extinguisher control circuit and safety trip control circuit, in which MX is the opening coil, SB1~8 are emergency stop buttons, N1~2, 7~9 LIMIT are threshold switches, and N3~4, 10~11 FIRE are fire extinguisher linkage contacts. When a fire or other emergency occurs, the corresponding contacts are closed, and the opening coil is activated to disconnect the incoming cabinet.

[0025] Fig.13 It is the transformer temperature monitoring and control loop, where 29DK is the transformer temperature controller, 1~2 contacts are the temperature controller control power supply, 3~10 are fan interfaces, 13~14 are alarm interfaces, 15~16 are trip interfaces, 19~22 are analog interfaces. When the transformer temperature exceeds the set value, 15~16 points are closed, 29KA1 relay is activated, all low-voltage circuit breakers are cut off, and the signal is transmitted to the background.

[0026] Fig.14 It is an electric energy monitoring system, in which 11P1 is a multi-function meter, 1-4 are sampling voltages, 5-10 are sampling currents, 11-13 are controller power supplies, and 34-35 are relay output points. In addition to displaying electric energy parameters, the multi-function meter (11) also has undervoltage, overvoltage, and phase sequence monitoring protection functions. When a certain electric energy parameter exceeds the set value, 34-35 points are closed, 11KA1 relay is activated, all low-voltage circuit breakers are cut off, and the signal is transmitted to the background.

[0027] Fig.15 It is a safety protection control circuit, in which 27KAU is a safety relay, A1~A2 is the relay power supply, 13~14, 23~24 are relay output interfaces, S11~S12, S21~S22 are relay forced output interfaces, S33~S34 are relay fault reset interfaces. When a control circuit fails, 13~14, 23~24 contacts are closed, cutting off all low-voltage circuit breakers. After the fault is eliminated, the safety relay needs to be manually restored.

[0028] Fig.16 , Fig.17 , Fig.18 It is a leakage protection control circuit, in which 25GF is a residual current controller that can monitor 4 circuits, 12~13 are power supplies, 34~41 are relay output interfaces, 1~5 are residual current transformer interfaces, and each low-voltage molded case circuit breaker is equipped with a residual current transformer. A pressure loss coil is installed inside the molded case. When a circuit breaker leaks electricity, the leakage signal is transmitted to the controller through the residual current transformer, and the corresponding relay is actuated to cut off the corresponding molded case circuit breaker.

[0029] Figure 19 to Figure 23 It is a remote I / O module. According to the actual needs of the on-site equipment, two groups of 32-bit I / O modules (31A3~4) are selected to transmit the molded case circuit breaker, micro-break, leakage alarm signal, transformer temperature alarm signal, etc. in the box transformer to the background. Since the 8-meter shield has three groups of transformers that need to collect temperature signals, it is equipped with two groups of analog modules (31A1~2). Each module can collect two groups of analog signals. It is also equipped with an Ethernet interface (31A0) to facilitate communication with the background. DETAILED DESCRIPTION

[0030] As shown in the figure, the present invention comprises a box body, in which a high voltage chamber (102), a transformer chamber and a control chamber are arranged, a transformer (1) is arranged in the transformer chamber, and a ring main unit (2) is arranged in the high voltage chamber (102).

[0031] There are two boxes, which are arranged in a transverse direction. The front box is arranged with a first control room (103), a first transformer room (104), and a second transformer room (105) in sequence from front to back, and the rear box is arranged with a second control room (100), a third transformer room (101), and a high-voltage room (102) in sequence from front to back.

[0032] The first control room (103) is divided into two compartments from front to back, and each compartment is provided with a double door at the front end; the first transformer room (104) and the second transformer room (105) are each provided with three sets of double doors at the front end from front to back;

[0033] The second control room (100) is divided into three compartments from front to back, each compartment is provided with a double door at the front end, and a plurality of mounting holes (3) are evenly distributed vertically on both sides of each compartment;

[0034] The front end of the third transformer room (101) is provided with three sets of double doors from front to back; the front end of the high-voltage room (102) is provided with a double door.

[0035] The bottom (10) of the box body is provided with a vent (51), fans (5) are provided on both sides of the box body, a semi-U-shaped fan cover is provided on the outside of the fan, the opening of the fan cover faces downward, a dustproof sponge (50) is provided inside the fan cover, and a mesh plate is provided at the opening of the fan cover.

[0036] The mesh size of the mesh plate is 10mm×10mm.

[0037] Fire extinguishers (6) are provided in the first control room (103), the second control room (100) and the third transformer room (101).

[0038] The fire extinguisher adopts an ultra-fine dry powder automatic fire extinguishing device, the fire signal output port of the ultra-fine dry powder automatic fire extinguishing device is connected to the control port of the incoming load switch, and the incoming load switch is connected to the incoming end of the ring network cabinet (2).

[0039] The transformers in the first transformer room (104), the second transformer room (105) and the third transformer room (101) are all 2000KVA dry-type transformers.

[0040] The box body is made of 8KD open steel.

[0041] The box body is provided with a limit switch for detecting whether the box door is opened or closed, the detection signal output port of the limit switch is connected to the control port of the incoming load switch, and the incoming load switch is connected to the incoming terminal of the ring network cabinet (2).

[0042] The diameter of the mounting holes (3) is 9.2 mm, and the spacing between adjacent mounting holes (3) is 20 mm.

[0043] A device mounting beam (20) is provided in the second control room (100), and a guide rail (21) is installed on the mounting beam (20).

[0044] The residual current controller 7, the safety relay 8, the I / O module 9, the molded case circuit breaker 12, the micro-circuit breaker 13, the residual current detector 14, the intermediate relay 15, the switching power supply 16, the terminal block 17, the isolating switch fuse group 18, and the dual power supply 19 are installed on the mounting beam (20).

[0045] The front end of the box body is provided with a box door, and the box door is provided with a tempered glass display window (4).

[0046] The transformer room is provided with a transformer temperature detection part (22) and a heat dissipation device (23); a control signal input port of the heat dissipation device is connected to a control signal output port of the controller; and a signal transmission port of the controller is connected to a signal transmission port of a display control panel on the box door.

[0047] Once the temperature exceeds the alarm limit, the power supply will be cut off and an alarm will be sounded. The controller sends a control signal to the incoming load switch, the load switch trips, and the alarm is sounded through the panel.

[0048] The transformer temperature detection part (22) adopts a PT100 platinum resistor, and the PT100 platinum resistor is pre-buried in the dry-type transformer winding.

[0049] The heat dissipation device (23) uses six heat dissipation fans, which are arranged on the transformer, three at the front and three at the back.

[0050] The controller adopts LD-B10-10 controller.

[0051] The control circuit includes a primary system part, a fire extinguisher and safety tripping control circuit, a transformer temperature control circuit, an electric energy monitoring part, a protection control circuit, a leakage protection module and a remote I / O module. The power ports of the fire extinguisher and safety tripping control circuit are respectively connected to the power ports of the electric energy monitoring part, the power ports of the protection control circuit, the power ports of the leakage protection module and the power ports of the remote I / O module. The feedback signal output port of the primary system part is connected to the feedback signal input port of the remote I / O module, the control signal output port of the transformer temperature control circuit is connected to the control signal input port of the leakage protection module, the control signal output port of the electric energy monitoring part is connected to the control signal input port of the leakage protection module, the control signal output port of the protection control circuit is connected to the control signal input port of the fire extinguisher and safety tripping control circuit, and the feedback signal output port of the leakage protection module is connected to the feedback signal input port of the remote I / O module.

[0052] The primary system part includes frame circuit breakers 05Q1~05Q4, one end of the lower-level distribution box MCC02 (the primary circuit is a single-line diagram, and the two lines connected to MCC02 in the diagram, each line represents the three live wires) is connected to the first voltmeter, the first ammeter, one end of the first transformer, and one end of the frame circuit breaker 05Q3 through the frame circuit breaker 05Q1, and the other end of the lower-level distribution box MCC02 is connected to the second voltmeter, the second ammeter, one end of the second transformer, and one end of the frame circuit breaker 05Q4 through the frame circuit breaker 05Q2, the other end of the frame circuit breaker 05Q3 is connected to one end of the lower-level distribution box MCC03, and the other end of the frame circuit breaker 05Q4 is connected to the other end of the lower-level distribution box MCC03; 05Q1~05Q4 provide power to the lower-level distribution box.

[0053] The other end of the first transformer is connected to one end of the main switch, one end of switch V2, and one end of switch V3 through switch V1, and the other end of V2 is connected to the other end of the second transformer;

[0054] The other end of V3 is connected to one end of the third transformer, the first connector of the other end of the third transformer is respectively connected to the third voltmeter, the third ammeter, one end of the single-pole double-throw toggle terminal, one end of 13Q1, one end of 13Q2, one end of 13Q3, and one end of 13Q4, and the second connector of the other end of the third transformer is respectively connected to the fourth voltmeter, the fourth ammeter, one end of 17Q1, and one end of 17Q2;

[0055] The fixed end of the single-pole double-throw is respectively connected to the fifth voltmeter, the fifth ammeter, one end of the fuse, and one end of 15Q7. The other end of the fuse is connected to one end of the control transformer (24) (the control transformer (24) converts the 380V voltage into a 110V-0V-110V voltage, which is used as a control circuit power supply). The other end of the control transformer (24) is respectively connected to one end of 15Q1, one end of 15Q2, and one end of 15Q3. The other end of 15Q1 is connected to PDE30, the other end of 15Q2 is connected to PDE31, the other end of 15Q3 is connected to PDE32, the other end of 15Q7 is connected to MCC10, the other end of 13Q1 is connected to MCC05, the other end of 13Q2 is connected to PDE11, the other end of 13Q3 is connected to MCC09, the other end of 13Q4 is connected to MCC08, the other end of 17Q2 is connected to MCC04, and the other end of 17Q1 is connected to MCC01.

[0056] 13Q1-13Q4, 15Q1-15Q3, 15Q7, 17Q2, 17Q1 are molded case circuit breakers used to provide power to the lower-level distribution box. PDE30-PDE32, MCC10, MCC05, PDE11, MCC09, MCC08, MCC04, MCC01 are lower-level distribution boxes.

[0057] In the figure, PDE30 is only connected to one line, which represents 3 live wires. The MCC02 box is a lower-level distribution box. The user needs 2 incoming lines, so there are 2 lines, each with 3 live wires.

[0058] The 10KV power supply first reaches the incoming cabinet C. When the C cabinet is closed, the feeder cabinets V1~V3 are energized. When V1~V3 are closed, the corresponding three sets of transformers are energized at high voltage. At the same time, the 10KV high voltage is converted into 0.4KV low voltage. The low-voltage side of the transformer is connected to the molded case circuit breaker and the frame switch. These switches provide power for the lower-level distribution box. After any switch is closed, the lower-level distribution box is energized. The current and voltage of the transformer are monitored, and an electric power meter is used. The control transformer in the figure converts the 0.4KV power supply into 110V-0V-110V to provide power to the electric power meter.

[0059] The fire extinguisher and safety trip control circuit includes a trip coil MX (controls the shutdown of the incoming load switch), one end of MX is connected to 1L0 through a fuse, and the other end of MX is respectively connected to one end of the right emergency stop switch SB4 of SUB30 rear, one end of the left emergency stop switch SB3 of SUB30 rear, one end of the right emergency stop switch SB2 of SUB30 front, one end of the left emergency stop switch SB1 of SUB30 front, one end of the N1# SUB30 transformer room door limit switch N1# LIMIT, one end of the N2# SUB30 transformer room door limit switch N2# LIMIT, one end of the N3# SUB30 fire extinguisher linkage point switch (a fuse is set on the fire extinguisher body. When a fire occurs, the fuse is ignited, and the fire extinguisher linkage point is actuated to cut off the incoming load switch) N3# FIRE, one end of the N4# SUB30 fire extinguisher linkage point switch N4# FIRE end, SUB31 rear right emergency stop switch SB8 end, SUB31 rear left emergency stop switch SB7 end, SUB31 front right emergency stop switch SB6 end, SUB31 front left emergency stop switch SB5 end, N7# SUB31 transformer room door limit switch N7# LIMIT end, N8# SUB31 transformer room door limit switch N8# LIMIT end, N9# SUB31 transformer room door limit switch N9# LIMIT end, N10# SUB31 fire extinguisher linkage point switch N10# FIRE end, N11# SUB31 fire extinguisher linkage point switch N11# FIRE end are connected;

[0060] The other end of SUB30 rear right emergency stop switch SB4, the other end of SUB30 rear left emergency stop switch SB3, the other end of SUB30 front right emergency stop switch SB2, the other end of SUB30 front left emergency stop switch SB1, the other end of N1# SUB30 transformer room door limit switch N1# LIMIT, the other end of N2# SUB30 transformer room door limit switch N2# LIMIT, the other end of N3# SUB30 fire extinguisher linkage point switch N3# FIRE, the other end of N4# SUB30 fire extinguisher linkage point switch N4# FIRE, the other end of SUB31 rear right emergency stop switch SB8, the other end of SUB31 rear left emergency stop switch SB7, the other end of SUB31 front right emergency stop switch SB6, the other end of SUB31 front left emergency stop switch SB5, the other end of N7# SUB31 transformer room door limit switch N7# LIMIT, the other end of N8# SUB31 transformer room door limit switch N8# LIMIT, N9# The other end of the SUB31 transformer room door limit switch N9# LIMIT, the other end of the N10# SUB31 fire extinguisher linkage point switch N10# FIRE, and the other end of the N11# SUB31 fire extinguisher linkage point switch N11# FIRE are connected to one end of the ring network cabinet switch, and the other end of the ring network cabinet switch is connected to 1N0.

[0061] Front, back, left, and right indicate the position of the emergency stop switch. In the panel diagram, 08SB1 to 08SB4 are emergency stop buttons. Emergency stop switches are set at the four positions of front, back, left, and right. When a safety problem occurs on site, the incoming load isolation switch can be cut off immediately to ensure that the box-type transformer is powered off as a whole. That is, the emergency stop plays the role of cutting off the power supply and cutting off the power supply of the primary circuit. If a switch action is detected, MX controls the overall power off of the incoming load isolation switch.

[0062] The transformer temperature control circuit includes a transformer temperature controller 29DK, wherein the 1st and 2nd feet of 29DK are connected to 1L20.2 and 1L20.1 respectively, the 3rd to 5th feet of 29DK are connected to the L ends of fans fan1 to fan3 (assembly drawing number 23 is a heat dissipation fan, which is installed on the transformer, 3 of which are symmetrical in front and back, and can be connected to the power supply in any order, and can start and stop at the same time), the 6th foot of 29DK is connected to the N ends of fans fan1 to fan3, the 6th foot of 29DK is connected to the N ends of fans fan4 to fan6 (assembly drawing number 23 is a heat dissipation fan, which is installed on the transformer, 3 of which are symmetrical in front and back, and can be connected to the power supply in any order, and can start and stop at the same time), the 8th to 10th feet of 29DK are connected to the L ends of fans fan4 to fan6 respectively, the 15th foot of 29DK is connected to 1L20.1, and the 16th foot of 29DK is connected to 1L20.2 through the control terminal of relay 29KA1.

[0063] The transformer temperature controller (10) is a LD-B10-10 type temperature controller.

[0064] The electric energy monitoring part includes a multi-function electric power meter (panel icon number 11) 11P1, the 35th pin of 11P1 is connected to the 13th pin of 1N0 and 11P1 respectively through the control end of the relay 11KA1, the 34th pin of 11P1 is connected to the 1L0 and one end of the fuse 11Q3 respectively, and the other end of 11Q3 is connected to the 12th pin of 11P1; the 11th pin of 11P1 is grounded;

[0065] Pins 5 to 6 of 11P1 are connected to the output port of a three-phase current transformer (to detect the current on the low-voltage side of the transformer), and pins 1 to 4 of 11P1 are connected to three-phase electricity through fuse 11Q1. The three-phase electricity is then connected to ground through contactor 11Q2 and surge protector 11PRD in turn.

[0066] The multifunctional electric power meter adopts an APMD electric power meter.

[0067] The protection control circuit includes a safety relay (assembly drawing number 8) 27KAU, and the A1 and A2 ports of 27KAU are respectively connected to 15L04 and 15N04 (A1 and A2 are power supplies of the safety relay, 15L04 and 15N04 represent that a 110V power supply is connected to A1 and A2, which is actually from the control transformer), the 13th pin of 27KAU is connected to 1L0, and the 23rd pin of 27KAU is connected to SUB31 (the pre-installed box transformer of the present invention is a product of 2 sets of 1 set, one box is called SUB30, and the other is called SUB31), the S11 port of 27KAU is connected to the S12 port of 27KAU through six emergency stop buttons (used to cut off all low-voltage circuit breakers, these 6 emergency stops are no longer in the box transformer, but are interfaces reserved for the site), and the S21 port of 27KAU is connected to the S22 port of 27KAU through the emergency stop button;

[0068] The S24 port of 27KAU is connected to SUB31, the 14th pin of 27KAU is connected to 18-1 (which is the signal to cut off all circuit breakers), the Y36 and Y37 ports of 27KAU are connected, and the S34 port of 27KAU is connected to the S33 port of 27KAU through switch 27SB1.

[0069] The safety relay adopts a PILZ type relay.

[0070] The leakage protection module includes residual current controllers 25GF and 26GF. The L and N ports of 25GF are connected to 1L0 and 1N0 respectively. The J1 port of 25GF is connected to 1L0 through the control terminal of relay 25K1, the J2 port of 25GF is connected to 1L0 through the control terminal of relay 25K2, the COM port of 25GF is connected to 1N0, the J3 port of 25GF is connected to 1L0 through the control terminal of relay 25K3, the J4 port of 25GF is connected to 1L0 through the control terminal of relay 25K4, and the COM port of 25GF is connected to 1N0.

[0071] The I1, I2, I3, and I4 ports of 25GF are connected to the CM1 port of 25GF through the residual current transformer probes 13T1, 13T2, 13T3, and 13T4 respectively;

[0072] The L and N ports of 26GF are connected to 1L0 and 1N0 respectively. The J1 port of 26GF is connected to 1L0 through the control terminal of relay 26K1, the J2 port of 26GF is connected to 1L0 through the control terminal of relay 26K2, the COM port of 26GF is connected to 1N0, the J3 port of 26GF is connected to 1L0 through the control terminal of relay 26K3, and the COM port of 26GF is connected to 1N0;

[0073] The I1, I2, and I3 ports of 26GF are connected to the CM1 port of 26GF through the residual current transformer probes 15T1, 17T1, and 17T2 respectively;

[0074] 1L0 is connected to one end of the controlled normally closed switch of the protection relay 11KA1, one end of the controlled normally closed switch of the relay 14KA1, and one end of the controlled normally closed switch of the relay 12KA1 respectively through the controlled normally open switch of the safety relay 27KAU and the controlled normally closed switch of the transformer over-temperature protection relay 29KA1;

[0075] The other end of the controlled normally closed switch of 11KA1 is respectively connected to one end of the controlled normally closed switch of relay 25K1, one end of the controlled normally closed switch of relay 25K2, one end of the controlled normally closed switch of relay 25K3, and one end of the controlled normally closed switch of relay 25K4. The other end of the controlled normally closed switch of 25K1 is respectively connected to one end of 13UV1 and one end of the indicator light 18D1. The other end of 13UV1 is respectively connected to the other end of 18D1 and 1N0.

[0076] The other end of the controlled normally closed switch 25K2 is connected to one end of 13UV2 and one end of the indicator light 18D2, and the other end of 13UV2 is connected to the other end of 18D2 and 1N0;

[0077] The other end of the controlled normally closed switch 25K3 is connected to one end of 13UV3 and one end of the indicator light 18D3, and the other end of 13UV3 is connected to the other end of 18D3 and 1N0;

[0078] The other end of the controlled normally closed switch 25K4 is connected to one end of 13UV4 and one end of the indicator light 18D4, and the other end of 13UV4 is connected to the other end of 18D4 and 1N0;

[0079] The other end of the controlled normally closed switch of 14KA1 is connected to one end of 15UV7 and one end of indicator light 18D5 through the controlled normally closed switch of relay 26K1, and the other end of 15UV7 is connected to the other ends of 1N0 and 18D5 respectively;

[0080] The other end of the controlled normally closed switch of 12KA1 is connected to one end of the controlled normally closed switch of relay 26K2 and one end of the controlled normally closed switch of relay 26K3 respectively. The other end of the controlled normally closed switch of 26K2 is connected to one end of 17UV1 and one end of indicator light 18D6 respectively. The other end of 17UV1 is connected to the other ends of 1N0 and 18D6 respectively.

[0081] The other end of the controlled normally closed switch of 26K3 is connected to one end of 17UV2 and one end of the indicator light 18D7, and the other end of 17UV2 is connected to the other ends of 1N0 and 18D7.

[0082] 13UV1, 13UV2, 13UV3, 13UV4, 15UV7, 17UV1, and 17UV2 are undervoltage coils, which control circuit breakers 15Q1~15Q4, 15Q7, 17Q1, and 17Q 2 respectively. When the primary circuit voltage is too low, the undervoltage coil will operate and the corresponding circuit breaker will be disconnected.

[0083] 26GF is used to control 26K1, 26K2, and 26K3, and its usage is the same as 25K1~25K3.

[0084] The residual current detector is an ARCM type detector.

[0085] The remote I / O module includes a switching power supply 31U1 (AC 110V converted to DC 24V), the input end of 31U1 is connected to 1L0 and 1N0 respectively, and the output end of 31U1 is connected to the power supply end of CONTROLNET SINGLE MEDIA ADAPTOR MODULE (network adapter 1794-ACN15);

[0086] The 0 port of 31A3 is connected to the AO port of the transformer temperature controller 29DK, the 17 port of 31A3 is connected to the 19 port of 31A3, the 21 port of 31A3, and the COM port of 29DK, the BO port of 29DK is connected to the 2 port of 31A3, and the CO port of 29DK is connected to the 4 port of 31A3;

[0087] The 0 port of 31A4 is connected to the AO port of the transformer temperature controller 46DK, the 17 port of 31A4 is connected to the 19 port of 31A4, the 21 port of 31A4, and the COM port of 46DK respectively, the BO port of 46DK is connected to the 2 port of 31A4, and the CO port of 46DK is connected to the 4 port of 31A4;

[0088] The 6th port of 31A4 is connected to the AO port of the transformer temperature controller 47DK. The 23rd port of 31A4 is connected to the 25th port of 31A4, the 27th port of 31A4, and the COM port of 47DK. The BO port of 47DK is connected to the 8th port of 31A4, and the CO port of 47DK is connected to the 10th port of 31A4.

[0089] Port 0 of 31A1 is connected to the 17Q1-SED (CBM01) switch, port 17 of 31A1 is connected to the 26K2 MCC01 Ground fault trip switch, port 1 of 31A1 is connected to the 05Q1-SDE (CBM02Y) switch, port 18 of 31A1 is connected to the 48KA1 48KA2 Ground fault trip switch, port 2 of 31A1 is connected to the 05Q2-SDE (CBM02D) switch, port 19 of 31A1 is connected to the 05Q3-SDE (CBM03Y) switch, port 3 of 31A1 is connected to the 05Q4-SDE (CBM03D) switch, port 20 of 31A1 is connected to the 26K3 MCC04 Ground fault trip switch, port 4 of 31A1 is connected to the 17Q2-SDE (CBM04) switch, and port 21 of 31A1 is connected to the 25K1 MCC05 Ground fault trip switch. trip switch, port 22 of 31A1 is connected to 25K3 MCC09 Ground fault trip switch, port 6 of 31A1 is connected to 16Q3-SDE (CBM07) switch, port 23 of 31A1 is connected to 25K4 MCC08 Ground fault trip switch, port 7 of 31A1 is connected to 16Q4-SDE (CBM08) switch, port 24 of 31A1 is connected to 25K2 PDE11 Ground faulttrip switch;

[0090] Port 0 of 31A2 is connected to the 20Q1-SDE (CBM50-01) switch, port 17 of 31A2 is connected to the 24Q3-SDE (CBM50-18) switch, port 1 of 31A2 is connected to the 21Q1-SDE (CBM50-02) switch, port 18 of 31A2 is connected to the 24Q4-SDE (CBM50-19) switch, port 2 of 31A2 is connected to the 21Q2-SDE (CBM50-03) switch, port 19 of 31A2 is connected to the 24Q5-SDE (CBM50-20) switch, port 3 of 31A2 is connected to the 21Q3-SDE (CBM50-04) switch, port 4 of 31A2 is connected to the 21Q4-SDE (CBM50-05) switch, and port 5 of 31A2 is connected to the 22Q1-SDE (CBM50-07) Switch, port 6 of 31A2 is connected to 22Q2 (CBM50-08) switch, and port 7 of 31A2 is connected to CBM50-09-SDE switch.

[0091] The transformer temperature controller adopts LD-B10-10 type temperature controller.

[0092] The switches connected to 31A1 and 31A2 are used for signal feedback.

[0093] 31A0, 31A1, 31A2, 31A3, and 31A4 are all PLC acquisition devices, among which 31A0 is a network adapter 1794-ACN15 used as a communication module, 31A1 and 31A2 are digital input modules 1756-IB32, and 31A3 and 31A4 are analog input modules 1756-IE16.

[0094] The present invention is applicable to an 8-meter shield machine and is used as a prefabricated box transformer with a transformer capacity of 6000KVA.

[0095] The height and depth of the box transformer can be within H*D=2200mm*2000mm. The box transformer has the functions of easy installation and disassembly, ventilation and anti-corrosion, transformer temperature monitoring, electrical monitoring, fire alarm and fire extinguishing.

[0096] Under the condition of meeting the equipment capacity, the present invention divides a 6000KVA transformer into three groups of 2000KVA transformers and places them in two box transformers (1), thereby meeting the equipment capacity and occupying a small space.

[0097] The present invention adopts a ring main unit (2) whose frame can adopt 8KD type open steel. Two sides of the steel have mounting holes (3) with a module of 20 mm and φ9.2 respectively. Components are mounted on a mounting beam. The mounting beam is provided with a guide rail, which is convenient for mounting, disassembling and repairing the components. The overall assembly capability is strong, and the front panel has a display and a tempered glass display window (4).

[0098] The ventilation design includes a vent (51) punched at the bottom of the box-type transformer, and fans are added on both sides of the box-type transformer for forced ventilation. The fan is covered by a semi-U-shaped structure on the outside, a sponge is placed inside, and a mesh plate is used for installation at the bottom. This structure has the effect of preventing rain and dust.

[0099] The whole box can be painted with high gloss white paint, RAL9010 pure white or similar colors. The metal surface is clean and has strong corrosion resistance.

[0100] The present invention uses an ultra-fine dry powder automatic fire extinguishing device (6) and places a fire extinguisher inside each unit. The top of the fire extinguisher has a fuse and a pair of normally open contacts. Once a fire occurs, the fire extinguisher is opened by the fuse to extinguish the fire. At the same time, the normally open point of the fire extinguisher closes and sends a signal to the shunt coil of the incoming load switch, immediately cutting off the high voltage part and minimizing the loss.

[0101] The box-type transformer is divided into a high-voltage room (102), a transformer room and a control system unit. All units must be placed separately from each other, that is, ideally each has its own area.

[0102] A set of ring main cabinets is used in the high voltage room (102), in which the incoming line cabinet is equipped with a shunt coil connected to the limit switches on the doors of the transformer room and the low voltage room. Once someone opens the transformer room door or the safety baffle, the high voltage part will be immediately tripped and cut off. At the same time, emergency stop buttons are set around the box transformer to cut off the high voltage part at any time. Fig.12 shown.

[0103] The transformer room is equipped with a dry-type transformer, which will generate high heat when the equipment is running. The temperature of the transformer is monitored in real time, and the heat dissipation equipment is used to reduce the temperature of the transformer. A transformer temperature controller is used, and the controller is connected to 6 radiators to reduce the temperature of the transformer. The transformer temperature is monitored in real time through the serial port line, and the temperature of the three phases of the transformer is displayed on the panel. The high temperature and ultra-high temperature alarm limits can be set on the controller. Once the temperature exceeds the alarm limit, the power supply will be cut off and an alarm will be issued. Fig.13 shown.

[0104] The control system unit is equipped with leakage and power display monitoring and safety protection modules.

[0105] The electric energy display monitoring uses a multi-function meter to detect the transformer output end, displaying three-phase current, voltage, active power, reactive power, electroplating, harmonics, etc. In addition, the function meter has undervoltage, overvoltage, phase sequence monitoring and other protection functions. Fig.14 shown.

[0106] The safety protection module uses a safety relay. When an electrical circuit fails, all low-voltage circuit breakers will trip immediately and the circuit breakers cannot be closed again until the fault is cleared, thus avoiding further damage to the equipment. Fig.15 shown.

[0107] The leakage protection module uses a residual current controller combined with a current transformer. Once leakage occurs in the line passing through the current transformer, the corresponding relay will immediately operate to cut off the main power supply of the circuit. At the same time, the leakage current value is displayed on the module and an alarm is issued. Fig.17 shown.

[0108] The remote I / O module transmits the status of each switch, fault location, and power quality in the box transformer to the backend through communication, reducing personnel management and maintenance time. Fig.18 shown.

[0109] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the protection scope of the present invention.

Claims

1. A prefabricated box transformer, comprising a box body and a control circuit, wherein a high voltage room (102), a transformer room and a control room are arranged in the box body, and the characteristics are as follows: A transformer (1) is arranged in the transformer room, and a ring main unit (2) is arranged in the high-voltage room (102); the two boxes are arranged in a transverse direction, the front box is arranged with a first control room (103), a first transformer room (104), and a second transformer room (105) in sequence from front to back, and the rear box is arranged with a second control room (100), a third transformer room (101), and a high-voltage room (102) in sequence from front to back; The control circuit includes a primary system part, a fire extinguisher and safety trip control circuit, a transformer temperature control circuit, an electric energy monitoring part, a protection control circuit, a leakage protection module and a remote I / O module. The power ports of the fire extinguisher and safety trip control circuit are respectively connected to the power ports of the electric energy monitoring part, the power ports of the protection control circuit, the power ports of the leakage protection module and the power ports of the remote I / O module. The feedback signal output port of the primary system part is connected to the feedback signal input port of the remote I / O module. The control signal output port of the transformer temperature control circuit is connected to the control signal input port of the leakage protection module. The control signal output port of the electric energy monitoring part is connected to the control signal input port of the leakage protection module. The control signal output port of the protection control circuit is connected to the control signal input port of the fire extinguisher and safety trip control circuit. The feedback signal output port of the leakage protection module is connected to the feedback signal input port of the remote I / O module. The first control room (103) is divided into two compartments from front to back, and each compartment is provided with a double door at the front end; the first transformer room (104) and the second transformer room (105) are each provided with three sets of double doors at the front end from front to back; The second control room (100) is divided into three compartments from front to back, each compartment is provided with a double door at the front end, and a plurality of mounting holes (3) are evenly distributed vertically on both sides of each compartment; The front end of the third transformer room (101) is provided with three sets of double doors from front to back; the front end of the high-voltage room (102) is provided with a double door; The primary system part includes frame circuit breakers 05Q1-05Q4. One end of the lower distribution box MCC02 is respectively connected to the first voltmeter, the first ammeter, one end of the first transformer, and one end of the frame circuit breaker 05Q3 through the frame circuit breaker 05Q1. The other end of the lower distribution box MCC02 is respectively connected to the second voltmeter, the second ammeter, one end of the second transformer, and one end of the frame circuit breaker 05Q4 through the frame circuit breaker 05Q2. The other end of the frame circuit breaker 05Q3 is connected to one end of the lower distribution box MCC03, and the other end of the frame circuit breaker 05Q4 is connected to the other end of the lower distribution box MCC03. 05Q1-05Q4 provide power to the lower distribution box. The other end of the first transformer is connected to one end of the main switch, one end of switch V2, and one end of switch V3 through switch V1, and the other end of V2 is connected to the other end of the second transformer; The other end of V3 is connected to one end of the third transformer, the first connector of the other end of the third transformer is respectively connected to the third voltmeter, the third ammeter, one end of the single-pole double-throw toggle terminal, one end of 13Q1, one end of 13Q2, one end of 13Q3, and one end of 13Q4, and the second connector of the other end of the third transformer is respectively connected to the fourth voltmeter, the fourth ammeter, one end of 17Q1, and one end of 17Q2; The fixed end of the single-pole double-throw is respectively connected to the fifth voltmeter, the fifth ammeter, one end of the fuse, and one end of 15Q7; the other end of the fuse is connected to one end of the control transformer (24); the other end of the control transformer (24) is respectively connected to one end of 15Q1, one end of 15Q2, and one end of 15Q3; the other end of 15Q1 is connected to PDE30; the other end of 15Q2 is connected to PDE31; the other end of 15Q3 is connected to PDE32; the other end of 15Q7 is connected to MCC10; the other end of 13Q1 is connected to MCC05; the other end of 13Q2 is connected to PDE11; the other end of 13Q3 is connected to MCC09; the other end of 13Q4 is connected to MCC08; the other end of 17Q2 is connected to MCC04; and the other end of 17Q1 is connected to MCC01; 13Q1-13Q4, 15Q1-15Q3, 15Q7, 17Q2, 17Q1 are molded case circuit breakers used to provide power to the lower-level distribution box; PDE30-PDE32, MCC10, MCC05, PDE11, MCC09, MCC08, MCC04, and MCC01 are lower-level distribution boxes.

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