Ring main unit DTU

Abstract

The invention relates to the technical field of insulator relay protection, and provides a ring main unit DTU, which can carry out non-power-failure detection and transformation without influencing the power supply of downstream users through a control loop diagnosis module, and remarkably reduces the economic loss and inconvenience caused by power failure. Meanwhile, the module can quickly identify a fault source and locate whether the fault is a control loop fault or a secondary equipment fault, so that the fault processing time is greatly shortened, and the operation and maintenance cost is reduced. The equipment adopts a modular design and is convenient to expand and upgrade. The display module displays the equipment state and management parameters in real time, and the operation convenience is improved. The control terminal remote signaling isolation detection module supports power-off direct connection and power-on isolation remote signaling output functions, and ensures safe and timely information transmission. In addition, the equipment has environmental adaptability such as water resistance and dust resistance, is suitable for being used under various severe conditions, and ensures long-term stable operation.

Description

Technical Field

[0001] The invention relates to the technical field of relay protection, in particular to a ring network cabinet DTU. Background Art

[0002] DTU (Distribution Terminal Unit) ring main unit equipment is an intelligent device used in power distribution systems, mainly used to realize the automation and intelligent management of distribution networks. Its basic functions include data acquisition, remote monitoring and control. It is mainly used in ring main unit automation, distributed power management and fault management, and improves power supply reliability and operational efficiency through operations such as fast power switching, optimizing power quality and locating fault points.

[0003] With the widespread use of power distribution automation, DTU ring main unit equipment has become a relatively mature control and management equipment for cable lines. Due to the harsh operating environment of the ring main unit and the rapid aging of secondary control equipment, the primary equipment is often intact, but the control circuit is blocked and the control device is damaged. In the power distribution system, "primary equipment" refers to equipment directly related to power transmission and conversion, including transformers, circuit breakers, disconnectors, busbars, cables and wires. These devices are the core power transmission and distribution devices that ensure that power is transmitted from the power generation end to the user end. In the application of DTU ring main unit equipment, the integrity of the primary equipment means that the basic functions of power transmission are normal, but if there is a problem with the control circuit (that is, the secondary equipment), it will affect the monitoring, protection and automatic operation functions of the equipment.

[0004] In order to solve the problem that the primary equipment is intact but the control circuit is blocked and the control device is damaged, power outage detection and modification are required. However, power outage detection and modification will have an impact on downstream users. In addition, due to the complex operating environment of the ring network cabinet and the difficulty of on-site construction, the cycle and cost of power outage detection are also high.

[0005] Based on this, the present invention provides a ring main unit DTU to solve the problem of power outage replacement and reconstruction of damaged ring main unit control devices. Summary of the invention

[0006] The purpose of the present invention is to solve the deficiencies of the prior art and provide a ring main unit DTU to achieve non-power outage detection and transformation.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A ring main unit DTU, comprising: a ring main unit wiring terminal connected to a ring main unit output interface via a signal line, a remote terminal wiring terminal connected to a remote control terminal input interface via a signal line, a control module, a display module, a control loop diagnosis module, and a control terminal remote signal isolation detection module;

[0009] The control module is electrically connected to the ring main unit wiring terminal, the remote wiring terminal, the control module, the display module, the control loop diagnostic module, and the control terminal remote signal isolation detection module; the ring main unit wiring terminal and the remote wiring terminal are both provided with a plurality of connection terminals;

[0010] The control circuit diagnosis module is used to realize several mechanism control functions according to the external ring main unit action mechanism; the control circuit diagnosis module is used to detect the control circuit, the control coil of the secondary equipment and the motor fault; the control circuit diagnosis module can directly replace the original control equipment to operate; the control terminal remote signal isolation detection module is used for the power-off direct remote signal output and the power-on isolation remote signal output function, so as to realize the control terminal and the ring main unit control equipment to collect the remote signal at the same time;

[0011] The display module is used to display the working status display interface and manage equipment parameters.

[0012] Preferably, the connection terminals of the ring network cabinet are, in sequence, the positive pole of the working power supply (Vin+), the negative pole of the working power supply (Vin-), the knife switch closed + / open-, the circuit breaker open + (motor+), the knife switch closed- / open+, the circuit breaker closed- (motor-), the circuit breaker open + (FZ2+), the circuit breaker open- (FZ2), the open position detection (FZW), the closed position detection (HZW), the grounding position detection (JDW), the energy storage position detection (CNW), and the detection common terminal (WCOM).

[0013] Preferably, the remote wiring terminals are opening control (FZC), closing control (HZC), control common terminal (CCOM), opening position output (FZWo), closing position output (HZWo), grounding position output (JDWo), energy storage position output (CNWo), and output common terminal (WCOMo).

[0014] Preferably, the control loop diagnostic module is implemented by three switch mechanisms, which are respectively a load switch mechanism, a first circuit breaker switch mechanism, and a second circuit breaker switch mechanism.

[0015] Preferably, the load switch mechanism has a single-circuit, bidirectional control circuit for the switch output, i.e., the motor is closed when it is forward and open when it is reverse; the load switch mechanism, FxC and OutC are single-chip control signals; motor+ and motor- are switch control outputs, connected to the switch mechanism switch control line; VIN+ / VIN- are input action power supplies, connected to the power supply circuit of the ring network cabinet;

[0016] FxC is the output direction control, OutC is the opening and closing action output control, VIN+ / VIN- is the input action power supply, and motor+ and motor- are the output control interfaces;

[0017] During the closing action, FxC and OutC input high level at the same time; FxC inputs high level, Q1 transistor is turned on, the direction relay is energized, the output voltage Vm1 is positive, and the output voltage Vm2 is negative; OutC inputs high level, Q2 transistor is turned on, the output control relay is energized, Vm1 and Vm2 levels are respectively turned on and output to the motor + and motor - ports. Because the motor + is connected to the positive power level and the motor - is connected to the negative power level, the motor is controlled to rotate forward, and then the closing action is performed;

[0018] When the opening action occurs, FxC inputs a low level and OutC inputs a high level; when FxC inputs a low level, the Q1 transistor does not conduct, the directional relay does not energize, the output voltage Vm1 is negative, and the output voltage Vm2 is positive; when OutC inputs a high level, the Q2 transistor conducts, the output control relay energizes, and the Vm1 and Vm2 levels are respectively conducted and output to the motor + and motor - ports. Because the motor + is connected to the negative power level and the motor - is connected to the positive power level, the motor is controlled to reverse, thereby executing the opening action.

[0019] Preferably, the first circuit breaker switch mechanism has a double-circuit control output, that is, the opening coil and the closing coil independently control the output opening and closing actions; for the first circuit breaker switch mechanism, FZ2C and OutC are single-chip control signals; motor+ and motor- are closing control outputs, connected to the closing coil control line of the switch mechanism; FZ2+ and FZ2- are opening control outputs, connected to the opening coil control line of the switch mechanism;

[0020] FZ2C is the output control for the opening action, OutC is the output control for the closing action, motor+ and motor- are the closing output control interfaces, and FZ2+ and FZ2- are the opening control output interfaces;

[0021] When closing, OutC inputs a high level; OutC inputs a high level, the Q2 transistor is turned on, the output control relay is energized, and the Vm1 and Vm2 levels are respectively turned on and output to the motor + and motor - ports. Since the motor + and motor - are energized, the control closing coil is energized and the closing action is executed;

[0022] When the opening action occurs, FZ2C inputs a high level; FZ2C inputs a high level, the Q3 transistor is turned on, the opening output control relay is energized, and the Vm1 and Vm2 levels are turned on and output to the FZ2+ and FZ2- ports respectively. Since FZ2+ and FZ2- are energized, the opening coil is energized and the opening action is executed.

[0023] Preferably, the second circuit breaker switch mechanism has a dual-circuit control output, that is, the opening coil and the closing coil independently control the output opening and closing actions, wherein the motor + and motor - outputs, the forward output is the energy storage action output, and the reverse output is the closing action output; the second circuit breaker switch mechanism, FZ2C, FxC, OutC are single-chip control signals; motor + and motor - are energy storage and closing control outputs, connected to the energy storage and closing control lines of the switch mechanism; FZ2+ and FZ2- are opening control outputs, connected to the opening coil control line of the switch mechanism;

[0024] FxC is the output direction control, OutC is the energy storage and closing action output control, VIN+ / VIN- is the input action power supply, motor+ and motor- are the output control interfaces, and FZ2+ and FZ2- are the opening control output ports;

[0025] During energy storage, FxC and OutC input high level at the same time; FxC inputs high level, Q1 transistor is turned on, the direction relay is energized, the output voltage Vm1 is positive, and the output voltage Vm2 is negative; OutC inputs high level, Q2 transistor is turned on, the output control relay is energized, Vm1 and Vm2 levels are respectively turned on and output to the motor + and motor - ports. Since the motor + is connected to the positive power level and the motor - is connected to the negative power level, the motor is controlled to rotate forward, thereby performing energy storage.

[0026] During the closing action, FxC inputs a low level and OutC inputs a high level; FxC inputs a low level, Q1 transistor is not turned on, the direction relay is not energized, the output voltage Vm1 is negative, and the output voltage Vm2 is positive; OutC inputs a high level, Q2 transistor is turned on, the output control relay is energized, Vm1 and Vm2 levels are respectively turned on and output to the motor + and motor - ports. Because the motor + is connected to the negative power level and the motor - is connected to the positive power level, the motor is controlled to perform reverse rotation, and then the closing action is performed;

[0027] When the opening action occurs, FZ2C inputs a high level; FZ2C inputs a high level, the Q3 transistor is turned on, the opening output control relay is energized, and the Vm1 and Vm2 levels are turned on and output to the FZ2+ and FZ2- ports respectively. Since FZ2+ and FZ2- are energized, the opening coil is energized and the opening action is executed.

[0028] Preferably, the control terminal remote signal isolation detection module has the functions of direct remote signal output when power is off and remote signal output isolation when power is on, which can conveniently and safely realize the function of simultaneous remote signal collection by the control terminal and the ring network cabinet control equipment; FZW, HZW, JDW, CNW, and WCOM are external mechanism remote signal input signals, which are connected to the external mechanism remote signal input interface; FZWo, HZWo, JDWo, CNWo, and WCOMo are remote signal output signals, which are connected to the remote signal detection terminal of the ring network cabinet control equipment;

[0029] FZW is the opening position detection interface, HZW is the closing position detection interface, JDW is the grounding position detection interface, CNW is the energy storage position detection interface, and WCOM is the detection common terminal interface; FZWo is the opening position output interface, HZWo is the closing position output interface, JDWo is the grounding position output interface, CNWo is the energy storage position output interface, and WCOMo is the output common terminal interface;

[0030] FZW signal detection circuit, when VIN+ / VIN- is without power, FZW signal is directly connected to FZWo signal through K5 relay normally closed point to achieve the purpose of conducting signal circuit; when VIN+ / VIN- is powered, K4 / K6 / K5 / K7 relays are energized and energized, FZW signal is conducted to FZW1 signal circuit through K4 relay (already energized), FZW1 signal outputs 2-way FZW status signals to Fzw-1 and FZWo1 by controlling K1 relay, among which Fzw-1 is used to control equipment to detect FZW signal, and FZWo1 is used to output to FZWo signal, thereby achieving isolation detection and isolation signal output functions;

[0031] The HZW, JDW, CNW, and WCOM signal detection processes are the same as the FZW signal detection circuit.

[0032] Preferably, the control module, the control loop diagnostic module, and the control terminal remote signal isolation detection module are integrated inside the waterproof shell; an end cover is provided at one end of the waterproof shell, and a quick-release ring network cabinet terminal and a remote terminal are provided on the end cover; a waterproof sealing layer is immersion-molded on the outer side of the waterproof shell, and the quick-release terminal includes a plurality of wire entry holes, and a clamping block is provided at the upper end of the wire entry hole inside the quick-release terminal, a clamping screw is provided at the upper end of the clamping block, and an elastic sealing assembly is provided at the wire entry hole; the end of the wire entry hole is provided as a conical structure, and the lower end of the clamping block is provided with an anti-slip groove; an elastic sealing ring is embedded in each wire entry hole; and the display module is provided outside the waterproof shell.

[0033] Preferably, insulating and waterproof electronic potting glue is filled between the control module, the control loop diagnostic module, the control terminal remote signal isolation detection module and the waterproof housing.

[0034] The present invention discloses a ring main unit DTU having the following beneficial effects.

[0035] The present invention uses a control loop diagnostic module to perform non-stop detection and transformation without affecting the power supply to downstream users, significantly reducing the economic losses and inconvenience caused by power outages. At the same time, the module can quickly identify the source of the fault and locate whether it is a control loop fault or a secondary equipment fault, greatly shortening the fault handling time and reducing operation and maintenance costs. The equipment adopts a modular design, which is easy to expand and upgrade. The display module displays the device status and management parameters in real time to improve the convenience of operation. The control terminal remote signal isolation detection module supports power-off direct pass and power-on isolation remote signal output functions to ensure safe and timely information transmission. In addition, the equipment has environmental adaptability such as waterproof and dustproof, and is suitable for use under various harsh conditions to ensure long-term stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a block diagram of the connection of each module of the present invention.

[0037] Figure 2 The figure is a wiring diagram of the ring main unit wiring terminal and the remote wiring terminal of the present invention.

[0038] Figure 3 It is the principle diagram of the load switch mechanism of the present invention.

[0039] Figure 4 This is a schematic diagram of the first circuit breaker switch mechanism of the present invention.

[0040] Figure 5 This is a schematic diagram of the second circuit breaker switch mechanism of the present invention.

[0041] Figure 6 It is a schematic diagram of the remote signal isolation detection module of the control terminal of the present invention.

[0042] Figure 7 It is a schematic diagram of the overall structure of the present invention.

[0043] Figure 8 It is a structural schematic diagram of the quick-release terminal block of the present invention.

[0044] Fig. 9 It is a schematic structural diagram of the internal compression block of the quick-release terminal block of the present invention.

[0045] Fig.10 It is a schematic diagram of the local structure of the wiring hole of the present invention.

[0046] In the attached drawings: 1. Waterproof shell; 2. End cover; 3. Quick-release terminal block; 301. Wire entry hole; 302. Clamping block; 303. Clamping screw; 304. Anti-slip groove; 4. Waterproof sealing layer; 5. Elastic sealing assembly; 501. Elastic sealing ring; 6. Control module; 7. Display module; 8. Control loop diagnostic module; 9. Control terminal remote signal isolation detection module. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0048] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] Example 1

[0050] Please refer to Figure 1 , a ring main unit DTU, comprising: a ring main unit wiring terminal connected to the ring main unit output interface through a signal line, a remote terminal wiring terminal connected to the remote control terminal input interface through a signal line, a control module 6, a display module 7, a control loop diagnosis module 8, and a control terminal remote signal isolation detection module 9;

[0051] The control module 6 is electrically connected to the ring main unit terminal, the remote terminal, the control module 6, the display module 7, the control loop diagnostic module 8, and the control terminal remote signal isolation detection module 9; the ring main unit terminal and the remote terminal are both provided with multiple connection terminals; the control module 6 uses a commercially available W806 single chip microcomputer.

[0052] The control loop diagnostic module 8 is used to realize several kinds of mechanism control functions according to the external ring network cabinet action mechanism; the control loop diagnostic module 8 is used to detect the control loop, the control coil and the motor fault of the secondary equipment; the control loop diagnostic module 8 can directly replace the original control equipment to run; it is worth noting that the control loop diagnostic module 8 is directly tested on the original control loop. If the control coil and the motor of the secondary equipment can work normally through the control loop diagnostic module 8 after connection, it proves that the original control loop is faulty; if the control coil and the motor of the secondary equipment cannot work normally through the control loop diagnostic module 8 after connection, it proves that the control coil and the motor of the secondary equipment are faulty. At this time, the corresponding control coil and the motor are detected, that is, the fault position is located, and the control terminal remote signal isolation detection module 9 is used for the power-off direct remote signal output and the power-on isolation remote signal output function, so as to realize the control terminal and the ring network cabinet control equipment to collect remote signal signals at the same time;

[0053] The display module 7 is used to display the working status display interface and manage equipment parameters. The display module 7 uses commercially available DC48480M040.

[0054] Please refer to Figure 2 The connection terminals of the ring main unit are the positive pole of the working power supply (Vin+), the negative pole of the working power supply (Vin-), the knife switch closed + / open-, the circuit breaker open + (motor+), the knife switch closed- / open+, the circuit breaker closed- (motor-), the circuit breaker open + (FZ2+), the circuit breaker open- (FZ2), the open position detection (FZW), the closed position detection (HZW), the grounding position detection (JDW), the energy storage position detection (CNW), and the detection common terminal (WCOM).

[0055] The remote wiring terminals are opening control (FZC), closing control (HZC), control common terminal (CCOM), opening position output (FZWo), closing position output (HZWo), grounding position output (JDWo), energy storage position output (CNWo), and output common terminal (WCOMo).

[0056] Through the control loop diagnostic module 8, it is possible to carry out power outage detection and transformation without affecting the power supply of downstream users, significantly reducing the economic losses and inconvenience caused by power outages. At the same time, the module can quickly identify the source of the fault, locate whether it is a control loop fault or a secondary equipment fault, greatly shorten the fault handling time and reduce the operation and maintenance cost. The equipment adopts a modular design, which is easy to expand and upgrade, and the electrical connection between the modules is stable and easy to maintain. The control module 6 is based on the commercially available STM32F407 single-chip microcomputer, with powerful processing capabilities, realizing intelligent decision support and optimizing operation management. The display module 7 displays the device status and management parameters in real time to improve the convenience and safety of operation. The control terminal remote signal isolation detection module 9 supports power-off direct pass and power-on isolation remote signal output functions to ensure safe and timely information transmission. In addition, the equipment has environmental adaptability such as waterproof and dustproof, suitable for use under various harsh conditions, and ensures long-term stable operation. The multiple connection terminal designs of the ring network cabinet terminal and the remote terminal simplify the wiring process, make installation and maintenance more convenient, and effectively reduce the difficulty of on-site construction.

[0057] Example 2

[0058] Based on Example 1, please refer to Figures 3 to 5 This embodiment provides a control loop diagnostic module 8 implemented by three switch mechanisms, which are a load switch mechanism, a first circuit breaker switch mechanism, and a second circuit breaker switch mechanism.

[0059] Load switch mechanism, the opening and closing output is a single circuit, a bidirectional control circuit, that is, the motor is closed when it rotates forward, and is opened when it rotates reversely; load switch mechanism, FxC, OutC are single chip control signals; motor +, motor - are opening and closing control outputs, connected to the opening and closing control line of the switch mechanism; VIN + / VIN - are input action power, connected to the power supply circuit of the ring network cabinet;

[0060] FxC is the output direction control, OutC is the opening and closing action output control, VIN+ / VIN- is the input action power supply, and motor+ and motor- are the output control interfaces;

[0061] During the closing action, FxC and OutC input high level at the same time; FxC inputs high level, Q1 transistor is turned on, the direction relay is energized, the output voltage Vm1 is positive, and the output voltage Vm2 is negative; OutC inputs high level, Q2 transistor is turned on, the output control relay is energized, Vm1 and Vm2 levels are respectively turned on and output to the motor + and motor - ports. Because the motor + is connected to the positive power level and the motor - is connected to the negative power level, the motor is controlled to rotate forward, and then the closing action is performed;

[0062] When the opening action occurs, FxC inputs a low level and OutC inputs a high level; when FxC inputs a low level, the Q1 transistor does not conduct, the directional relay does not energize, the output voltage Vm1 is negative, and the output voltage Vm2 is positive; when OutC inputs a high level, the Q2 transistor conducts, the output control relay energizes, and the Vm1 and Vm2 levels are respectively conducted and output to the motor + and motor - ports. Because the motor + is connected to the negative power level and the motor - is connected to the positive power level, the motor is controlled to reverse, thereby executing the opening action.

[0063] The first circuit breaker switch mechanism, the opening and closing output is a control double circuit, that is, the opening coil and the closing coil independently control the output opening and closing actions; the first circuit breaker switch mechanism, FZ2C, OutC are single chip control signals; motor +, motor - are closing control outputs, connected to the switch mechanism closing coil control line; FZ2+, FZ2- are opening control outputs, connected to the switch mechanism opening coil control line;

[0064] FZ2C is the output control for the opening action, OutC is the output control for the closing action, motor+ and motor- are the closing output control interfaces, and FZ2+ and FZ2- are the opening control output interfaces;

[0065] When closing, OutC inputs a high level; OutC inputs a high level, the Q2 transistor is turned on, the output control relay is energized, and the Vm1 and Vm2 levels are respectively turned on and output to the motor + and motor - ports. Since the motor + and motor - are energized, the control closing coil is energized and the closing action is executed;

[0066] When the opening action occurs, FZ2C inputs a high level; FZ2C inputs a high level, the Q3 transistor is turned on, the opening output control relay is energized, and the Vm1 and Vm2 levels are turned on and output to the FZ2+ and FZ2- ports respectively. Since FZ2+ and FZ2- are energized, the opening coil is energized and the opening action is executed.

[0067] The second circuit breaker switch mechanism, the opening and closing output is a control double circuit, that is, the opening coil and the closing coil independently control the output opening and closing actions, among which the motor + and motor - outputs, the forward output is the energy storage action output, and the reverse output is the closing action output; the second circuit breaker switch mechanism, FZ2C, FxC, OutC are single-chip control signals; motor + and motor - are energy storage and closing control outputs, connected to the switch mechanism energy storage and closing control lines; FZ2+ and FZ2- are opening control outputs, connected to the switch mechanism opening coil control line;

[0068] FxC is the output direction control, OutC is the energy storage and closing action output control, VIN+ / VIN- is the input action power supply, motor+ and motor- are the output control interfaces, and FZ2+ and FZ2- are the opening control output ports;

[0069] During energy storage, FxC and OutC input high level at the same time; FxC inputs high level, Q1 transistor is turned on, the direction relay is energized, the output voltage Vm1 is positive, and the output voltage Vm2 is negative; OutC inputs high level, Q2 transistor is turned on, the output control relay is energized, Vm1 and Vm2 levels are respectively turned on and output to the motor + and motor - ports. Since the motor + is connected to the positive power level and the motor - is connected to the negative power level, the motor is controlled to rotate forward, thereby performing energy storage.

[0070] During the closing action, FxC inputs a low level and OutC inputs a high level; FxC inputs a low level, Q1 transistor is not turned on, the direction relay is not energized, the output voltage Vm1 is negative, and the output voltage Vm2 is positive; OutC inputs a high level, Q2 transistor is turned on, the output control relay is energized, Vm1 and Vm2 levels are respectively turned on and output to the motor + and motor - ports. Because the motor + is connected to the negative power level and the motor - is connected to the positive power level, the motor is controlled to perform reverse rotation, and then the closing action is performed;

[0071] When the opening action occurs, FZ2C inputs a high level; FZ2C inputs a high level, the Q3 transistor is turned on, the opening output control relay is energized, and the Vm1 and Vm2 levels are turned on and output to the FZ2+ and FZ2- ports respectively. Since FZ2+ and FZ2- are energized, the opening coil is energized and the opening action is executed.

[0072] Example 3

[0073] Based on Example 1, please refer to Figure 6This embodiment provides a control terminal remote signal isolation detection module 9, which has the functions of direct remote signal output when power is off and remote signal output isolation when power is on, and can conveniently and safely realize the function of simultaneously collecting remote signal signals of the control terminal and the ring network cabinet control equipment; FZW, HZW, JDW, CNW, and WCOM are external organization remote signal input signals, which are connected to the external organization remote signal input interface; FZWo, HZWo, JDWo, CNWo, and WCOMo are remote signal output signals, which are connected to the remote signal detection terminal of the ring network cabinet control equipment;

[0074] FZW is the opening position detection interface, HZW is the closing position detection interface, JDW is the grounding position detection interface, CNW is the energy storage position detection interface, and WCOM is the detection common terminal interface; FZWo is the opening position output interface, HZWo is the closing position output interface, JDWo is the grounding position output interface, CNWo is the energy storage position output interface, and WCOMo is the output common terminal interface;

[0075] FZW signal detection circuit, when VIN+ / VIN- is without power, FZW signal is directly connected to FZWo signal through K5 relay normally closed point to achieve the purpose of conducting signal circuit; when VIN+ / VIN- is powered, K4 / K6 / K5 / K7 relays are energized and energized, FZW signal is conducted to FZW1 signal circuit through K4 relay (already energized), FZW1 signal outputs 2-way FZW status signals to Fzw-1 and FZWo1 by controlling K1 relay, among which Fzw-1 is used to control equipment to detect FZW signal, and FZWo1 is used to output to FZWo signal, thereby achieving isolation detection and isolation signal output functions;

[0076] The HZW, JDW, CNW, and WCOM signal detection processes are the same as the FZW signal detection circuit.

[0077] Example 4

[0078] Based on Example 1, please refer to Figure 7 and Fig.10In this embodiment, the control module 6, the control loop diagnosis module 8, and the control terminal remote signal isolation detection module 9 are integrated inside the waterproof shell 1, and an end cover 2 is provided at one end of the waterproof shell 1, and a quick-release terminal 3 composed of a ring network cabinet terminal and a remote terminal is provided on the end cover 2; a waterproof sealing layer 4 is soaked and molded on the outer side of the waterproof shell 1, and the quick-release terminal 3 includes a plurality of wire entry holes 301, and a clamping block 302 is provided at the upper end of the wire entry hole 301 inside the quick-release terminal 3, and a clamping screw 303 is provided at the upper end of the clamping block 302, and an elastic sealing component 5 is provided at the wire entry hole 301; the end of the wire entry hole 301 is provided with a conical structure, and the lower end of the clamping block 302 is provided with an anti-slip groove 304; an elastic sealing ring 501 is embedded in each wire entry hole 301; the display module 7 is arranged outside the waterproof shell 1.

[0079] Preferably, in this embodiment, insulating and waterproof electronic potting glue is filled between the control module 6 , the control loop diagnosis module 8 , the control terminal remote signal isolation detection module 9 and the waterproof housing 1 .

[0080] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The substitution may be a substitution of a part of the structure, device, method step, or a complete technical solution. The equivalent replacement or change according to the technical solution and the inventive concept of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A ring main unit DTU, characterized in that: include: Ring main unit wiring terminals connected to the output interface of the ring main unit through signal lines, remote terminal wiring terminals connected to the input interface of the remote control terminal through signal lines, control modules, display modules, control loop diagnostic modules, and control terminal remote signal isolation detection modules; The control module is electrically connected to the ring main unit wiring terminal, the remote wiring terminal, the control module, the display module, the control loop diagnostic module, and the control terminal remote signal isolation detection module; the ring main unit wiring terminal and the remote wiring terminal are both provided with a plurality of connection terminals; The control circuit diagnosis module is used to realize several mechanism control functions according to the external ring main unit action mechanism; the control circuit diagnosis module is used to detect the control circuit, the control coil of the secondary equipment and the motor fault; the control circuit diagnosis module can directly replace the original control equipment to operate; the control terminal remote signal isolation detection module is used for the power-off direct remote signal output and the power-on isolation remote signal output function, so as to realize the control terminal and the ring main unit control equipment to collect the remote signal at the same time; The display module is used to display the working status display interface and manage equipment parameters.

2. The ring main unit DTU according to claim 1, characterized in that: The connection terminals of the ring main unit are, in order, the positive pole of the working power supply (Vin+), the negative pole of the working power supply (Vin-), the knife switch closed + / open-, the circuit breaker open + (motor+), the knife switch closed- / open+, the circuit breaker closed- (motor-), the circuit breaker open + (FZ2+), the circuit breaker open- (FZ2), the open position detection (FZW), the closed position detection (HZW), the grounding position detection (JDW), the energy storage position detection (CNW), and the detection common terminal (WCOM).

3. The ring main unit DTU according to claim 1, characterized in that: The remote wiring terminals are opening control (FZC), closing control (HZC), control common terminal (CCOM), opening position output (FZWo), closing position output (HZWo), grounding position output (JDWo), energy storage position output (CNWo), and output common terminal (WCOMo).

4. The ring main unit DTU according to claim 1, characterized in that: The control loop diagnostic module is implemented by three switch mechanisms, which are a load switch mechanism, a first circuit breaker switch mechanism, and a second circuit breaker switch mechanism.

5. The ring main unit DTU according to claim 4, characterized in that: The load switch mechanism has a single-circuit opening and closing output and a bidirectional control circuit, that is, the motor is closed when it rotates forward and opened when it rotates reversely; the load switch mechanism, FxC and OutC are the microcontroller control signals; motor+ and motor- are the opening and closing control outputs, which are connected to the opening and closing control lines of the switch mechanism; VIN+ / VIN- are the input action power supplies, which are connected to the power supply circuit of the ring network cabinet.

6. The ring main unit DTU according to claim 4, characterized in that: The first circuit breaker switch mechanism has a dual-circuit control output, that is, the opening coil and the closing coil independently control the output opening and closing actions; for the first circuit breaker switch mechanism, FZ2C and OutC are single-chip microcomputer control signals; Motor+ and Motor- are closing control outputs, connected to the closing coil control line of the switch mechanism; FZ2+ and FZ2- are opening control outputs, connected to the opening coil control line of the switch mechanism.

7. The ring main unit DTU according to claim 1, characterized in that: The second circuit breaker switch mechanism, the opening and closing output is a dual-circuit control, that is, the opening coil and the closing coil independently control the output opening and closing actions, wherein the motor + and motor - outputs, the forward output is the energy storage action output, and the reverse output is the closing action output; the second circuit breaker switch mechanism, FZ2C, FxC, OutC are single-chip microcomputer control signals; Motor + and Motor - are energy storage and closing control outputs, connected to the switch mechanism energy storage and closing control lines; FZ2+ and FZ2- are opening control outputs, connected to the opening coil control line of the switch mechanism.

8. The ring main unit DTU according to claim 1, characterized in that: The control terminal remote signal isolation detection module has the function of direct remote signal output when power is off and isolated remote signal output when power is on, which can conveniently and safely realize the function of simultaneous remote signal collection by the control terminal and the ring network cabinet control equipment; FZW, HZW, JDW, CNW, and WCOM are external organization remote signal input signals, which are connected to the external organization remote signal input interface; FZWo, HZWo, JDWo, CNWo, and WCOMo are remote signal output signals, which are connected to the remote signal detection terminal of the ring network cabinet control equipment.

9. The ring main unit DTU according to claim 1, characterized in that: The control module, control loop diagnostic module, and control terminal remote signal isolation detection module are integrated inside the waterproof shell; an end cover is provided at one end of the waterproof shell, and a quick-release ring network cabinet terminal and a remote terminal are provided on the end cover; a waterproof sealing layer is immersion-molded on the outer side of the waterproof shell, and the quick-release terminal includes a plurality of wire entry holes, and a clamping block is provided at the upper end of the wire entry hole inside the quick-release terminal, a clamping screw is provided at the upper end of the clamping block, and an elastic sealing assembly is provided at the wire entry hole; the end of the wire entry hole is provided as a conical structure, and an anti-slip groove is provided at the lower end of the clamping block; the elastic sealing assembly is an elastic sealing ring embedded in each wire entry hole; the display module is provided outside the waterproof shell.

10. The ring main unit DTU according to claim 9, characterized in that: Insulating and waterproof electronic potting glue is filled between the control module, the control loop diagnosis module, the control terminal remote signal isolation detection module and the waterproof shell.

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