Junction-free box type feeder terminal

Abstract

A junction-free box type feeder terminal belongs to the field of feeder wiring and comprises a box body, a PCB (printed circuit board) module arranged in the box body, a power supply module connected with the PCB module and an aviation socket group, the PCB module is divided into a first circuit board, a second circuit board and a third circuit board, the first circuit board is provided with a power supply module row seat, an analog quantity acquisition module, a switching value output module, an aviation socket group and a first row seat connected with the second circuit board, and the second circuit board is provided with an input signal processing module, a first row pin connected with the first circuit board and a second row seat connected with the third circuit board. The third circuit board is provided with a CPU module, a 5V-to-3. 3V module, an analog quantity signal processing post-stage circuit, an input quantity signal processing post-stage circuit, an on-off output control pre-stage circuit and a second pin header connected with the second circuit board. By improving the wiring mode of the feeder terminal, the terminal wiring number is reduced, errors are not easy to occur, and the cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of feeder wiring, and specifically relates to a junction box-type feeder terminal. Background Technology

[0002] The distribution automation feeder terminal unit (FTU) is an intelligent device designed for users of 10kV overhead distribution lines. It can quickly isolate faulty users, preventing a single user's power failure from affecting the entire distribution network and causing unnecessary losses to power supply companies. As a feeder terminal unit, it needs to bring in the secondary signals from the pole-mounted switch body of the overhead distribution line via connectors and cables. This involves numerous signal line connectors, a large amount of welding work on the connectors, and is prone to errors. Furthermore, when connecting the connectors to the core unit inside the box-type terminal, the large number of wires makes wiring time-consuming, error-prone, and difficult to troubleshoot. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a junction box-free feeder terminal. By improving the wiring method of the feeder terminal, the number of terminal wires is reduced and errors are less likely to occur, thereby reducing costs.

[0004] The technical solution adopted by this utility model is: a junction box-type feeder terminal, including a box, the terminal further including a PCB board module, a power module and an aviation socket group connected to the PCB board module. The PCB board module is divided into a first circuit board, a second circuit board and a third circuit board. The first circuit board is provided with a power module socket, an analog signal acquisition module, a digital signal output module, and a first row of sockets connected to the second circuit board. The second circuit board is provided with an input signal processing module, a first row of pins connected to the first circuit board, and a second row of sockets connected to the third circuit board. The third circuit board is provided with a CPU module, a 5V to 3.3V module, an analog signal processing stage circuit, an input signal processing stage circuit, a digital signal output control stage circuit, and a second row of pins connected to the second circuit board.

[0005] Furthermore, the navigation socket is divided into voltage navigation socket, current navigation socket, and output and input signal navigation socket.

[0006] Furthermore, the analog quantity acquisition module includes a current transformer T1 and a transient diode Z1 connected in parallel with the output terminal of the current transformer T1. The current transformer T1 is a voltage transformer or a current transformer.

[0007] Furthermore, the switch output module includes a first start-up circuit and a first output circuit. The first start-up circuit consists of resistors R1 and R2 and transistor Q1, and the first output circuit consists of resistors R3 and R4, transistor Q2, relay JDQ1, and diode D1.

[0008] Furthermore, the input signal processing module includes resistors R5, R6, and R7 connected in series, a Zener diode D2, and an optocoupler U1. One end of a varistor RY1 is connected between resistors R5 and R6. A transient diode Z2 and a capacitor C1 are connected in parallel, with one end connected between resistors R6 and R7. The other end of the varistor RY1, transient diode Z2, and capacitor C1 is connected to the other input terminal of the optocoupler U1.

[0009] Furthermore, the analog signal processing stage circuit includes a sampling resistor R8, a first filter capacitor C2, a second filter capacitor C3 connected in parallel, a resistor R9 disposed between the first filter capacitor C2 and the second filter capacitor C3, one end of the second filter capacitor C3 connected to the 3rd contact of the first operational amplifier U2A, a resistor R10 connected between the 1st contact of the first operational amplifier U2A and the 2nd contact of the second operational amplifier U3A, a resistor R11 connected between one end of resistor R10 and the 1st contact of the second operational amplifier U3A, and resistors R12 and R13 respectively connected to the 3rd contact of the second operational amplifier U3A.

[0010] Furthermore, the input signal processing stage circuit comprises resistor R14, resistor R15, and capacitor C4.

[0011] Furthermore, the switching output control pre-stage circuit includes a second start-up circuit and a second output circuit. The second start-up circuit consists of resistors R16 and R17 and transistor Q3, and the second output circuit includes resistor R18 and capacitor C5.

[0012] The beneficial effects of this utility model are as follows: by improving the wiring method of the feeder terminal, the number of terminal wires is reduced and errors are less likely to occur, thereby reducing costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0015] Figure 3 This is a diagram showing the connection between the aviation plug and the aviation socket;

[0016] Figure 4 This is the circuit diagram of the analog signal acquisition module;

[0017] Figure 5 This is the circuit diagram of the digital output module;

[0018] Figure 6 This is the circuit diagram of the input signal processing module;

[0019] Figure 7This is the circuit diagram of the analog signal processing stage circuit;

[0020] Figure 8 This is the circuit diagram of the input signal processing stage circuit;

[0021] Figure 9 This is the circuit diagram of the front-end circuit for switch output control;

[0022] In the attached diagram: 1 is the power module, 2 is the first circuit board, 3 is the second circuit board, 4 is the third circuit board, 5 is the first pin header, 6 is the aviation socket, 7 is the aviation plug, 8 is the power module socket, 9 is the first socket, 10 is the second socket, and 11 is the second pin header. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0024] See appendix Figure 1-3 A junction box-type feeder terminal includes a housing. The terminal further includes a PCB board module housed within the housing, a power module 1 connected to the PCB board module, and six sets of navigation sockets. The PCB board module is divided into a first circuit board 2, a second circuit board 3, and a third circuit board 4. The first circuit board 2 includes a power module header 8, an analog signal acquisition module, a digital signal output module, and six sets of navigation sockets connected to the second circuit board via a first header 9. The second circuit board 3 includes an input signal processing module, a first header 5 connected to the first circuit board, and a second header 10 connected to the third circuit board. The third circuit board includes a CPU module, a 5V to 3.3V module, an analog signal processing stage circuit, an input signal processing stage circuit, a digital signal output control stage circuit, and a second header 11 connected to the second circuit board. The navigation sockets 6 are divided into voltage navigation sockets, current navigation sockets, and output and input signal navigation sockets.

[0025] This invention replaces the traditional wire-bonded aviation connector with a separate connector for the connector and socket. The socket 6 is directly soldered onto the PCB board, and the secondary signals from the switch body are transmitted to the terminal CPU for processing via PCB board traces. The traditional terminal-type power module is replaced with a pin-type power module. A socket is pre-installed on the PCB board, and the power module is directly plugged into the PCB board. The power signals required by the device are transmitted directly through PCB board traces.

[0026] The aforementioned feeder terminal comprises three circuit boards. The first circuit board 2 mainly includes power and voltage connectors, current connectors, output and input signal connectors, a power module socket 8, an analog signal acquisition module, a digital signal output module, and a socket connected to the second circuit board 3. The power signal from the connector is transmitted to the input terminal of the power module 1 through the PCB board. The voltage and current signals from the connector are transmitted to the analog signal acquisition transformer through the PCB board. The input signal from the connector is transmitted to the second circuit board 3 through the PCB board and the first socket 9. The digital signal output from the output relay is transmitted to the connector through the PCB board. The 24V output from the power module 1 is converted to 5V by a 24V to 5V circuit and then transmitted to the second circuit board 3 via the first socket 9. The analog signal from the transformer is transmitted to the second circuit board 3 through the PCB board and the first socket 9.

[0027] The second circuit board 3 mainly includes an input signal processing module, a first pin header 5 connected to the first circuit board 2, and a second connector 10 connected to the third circuit board 4. The input signals from the aviation connector are processed on the second circuit board 3 after passing through the first circuit board 2 and the first pin header 5. The analog signal and 5V power supply from the first circuit board 2, after processing, are transmitted from the third circuit board 4 to the output relay control signal of the first circuit board 2. The signal is then collected on the second circuit board 3 via the second connector 10 and connected to the third circuit board 4.

[0028] The third circuit board 4 includes a CPU module, a 5V to 3.3V module, an analog signal processing stage circuit, an input signal processing stage circuit, a digital output control stage circuit, and a second pin header 11 connected to the second circuit board 3. The control signal of the output relay of the third circuit board 4 is transmitted to the output relay of the first circuit board 2 through the second circuit board 3 and the pin header.

[0029] See appendix Figure 4 The analog signal acquisition module includes a current transformer T1 and a transient diode Z1 connected in parallel with the output of the current transformer T1. The current transformer T1 is either a voltage transformer or a current transformer. The YCXH signal output by the current transformer T1 passes through the first circuit board 2, the first header 9 of the first circuit board 2, and the pin header of the second circuit board 3 to reach the third circuit board 4.

[0030] See appendix Figure 5 The switch output module includes a first start-up circuit and a first output circuit. The first start-up circuit consists of resistors R1 and R2 and transistor Q1. The first output circuit consists of resistors R3 and R4, transistor Q2, relay JDQ1, and diode D1.

[0031] One end of resistor R1 is connected to signal QD from the third circuit board 4, and the other end is connected to the 5V power supply. One end of resistor R2 is connected to signal QD from the third circuit board 4, and the other end is connected to the base of transistor Q1. The emitter of transistor Q1 is connected to the 5V power supply, and the collector of transistor Q1 is connected to the first output circuit. One end of resistor R3 is connected to signal KZXH from the third circuit board 4, and the other end is connected to the base of transistor Q2. One end of resistor R4 is connected to signal KZXH from the third circuit board 4, and the other end is connected to the emitter of transistor Q2. The emitter of transistor Q2 is also connected to GND. The positive terminal of relay JDQ1 is connected to the collector of transistor Q1, and the negative terminal is connected to the collector of transistor Q2. Diode D1 is connected between the positive and negative terminals of relay JDQ1. The normally open contact of relay JDQ1 is the external output node, connected to the input and output signal socket.

[0032] See appendix Figure 6 The input signal processing module includes resistors R5, R6, and R7 connected in series, a Zener diode D2, and an optocoupler U1. One end of a varistor RY1 is connected between resistors R5 and R6. A transient diode Z2 and a capacitor C1 are connected in parallel, with one end connected between resistors R6 and R7. The other end of the varistor RY1, transient diode Z2, and capacitor C1 is connected to the other input terminal of the optocoupler U1.

[0033] The resistors R5, R6, R7, Zener diode D2, and optocoupler U1 connected in series are connected to the input signals of the output and input aviation sockets. One end of the varistor RY1 is connected to the busbar of resistors R5 and R6, and the other end is connected to the common input signal terminal of the output and input aviation sockets. One end of the transient diode Z2 is connected to the busbar of R6 and R7, and the other end is connected to the common input signal terminal of the output and input aviation sockets. Capacitor C1 is connected in parallel with transient diode Z2 and is positioned after transient diode Z2 and before resistor R7. The other end of the input of optocoupler U1 is connected to the common input signal terminal of the output and input aviation sockets. One end of the output of optocoupler U1 is connected to signal YXXH, and the other end is connected to GND. Signal YXXH reaches the third circuit board 4 after passing through the socket of the second circuit board 3.

[0034] See appendix Figure 7The analog signal processing stage circuit includes a sampling resistor R8, a first filter capacitor C2, and a second filter capacitor C3 connected in parallel. A resistor R9 is positioned between the first filter capacitor C2 and the second filter capacitor C3. One end of the second filter capacitor C3 is connected to contact 3 of the first operational amplifier U2A. A resistor R10 is connected between contact 1 of the first operational amplifier U2A and contact 2 of the second operational amplifier U3A. A resistor R11 is connected between one end of resistor R10 and contact 1 of the second operational amplifier U3A. Resistors R12 and R13 are connected to contact 3 of the second operational amplifier U3A, respectively. The output of the second operational amplifier U3A is connected to the CPU. The parallel sampling resistor R8, the first filter capacitor C2, and the second filter capacitor C9 are connected to the YCXH signal from the first circuit board 2.

[0035] See appendix Figure 8 The input signal processing stage circuit includes resistors R14 and R15, and capacitor C4. One end of resistor R14 is connected to signal YXXH from the second circuit board 3, and the other end is connected to a 3.3V power supply. One end of resistor R15 is connected to signal YXXH from the third circuit board 4, and the other end is connected to capacitor C4. The other end of capacitor C4 is connected to GND. The CPU pin CPU_GPIO3 is connected to the bus between R15 and C4.

[0036] See appendix Figure 9 The switching output control pre-stage circuit includes a second start-up circuit and a second output circuit. The start-up circuit consists of resistors R16 and R17 and transistor Q3. The output circuit includes resistor R18 and capacitor C5.

[0037] The second startup circuit consists of resistors R16 and R17, and transistor Q3. One end of resistor R16 is connected to the 3.3V power supply, and the other end is connected to the base of transistor Q3. One end of resistor R17 is connected to the 3.3V power supply, and the other end is connected to the emitter of transistor Q3. The emitter of transistor Q3 is also connected to the CPU control pin CPU_GPIO1, and the collector of transistor Q3 is connected to signal QD. The second output circuit includes resistor R18 and capacitor C5. Resistor R18 is connected to signal KZXH, and one end of its other end is connected to the CPU control pin CPU_GPIO2. One end of capacitor C5 is connected to the CPU control pin CPU_GPIO2, and the other end is connected to GND. Signals QD and KZXH pass through pin 11 of row 4 on the third circuit board and socket 3 on the second circuit board before reaching the first circuit board 2.

[0038] The secondary signal of the switch body is connected to the aviation connector 7 via a cable, and the aviation connector 7 is inserted into the aviation socket on the feeder terminal circuit board. The terminal can acquire the three-phase PT voltage, three-phase CT current, zero-sequence voltage, and zero-sequence current of the switch through the analog signal acquisition and processing module; it can realize the switch's closed, open, and uncharged switch signal acquisition functions through the switch signal processing module; the CPU module uses a high-performance Cortex-M4 core ARM chip to analyze and process the acquired data, and realize the switch control through the switch output module. When a line fault occurs, the terminal sends a control signal to control the switch to open and isolate the fault. There is no internal wiring in the terminal, which solves the problem of complex process and time-consuming and labor-intensive process caused by the traditional method of connecting to the terminal by soldering wires through the aviation connector.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A junction box-type feeder terminal, comprising a housing, characterized in that: The terminal also includes a PCB board module installed inside the housing, a power module (1) connected to the PCB board module, and a group of aviation sockets (6). The PCB board module is divided into a first circuit board (2), a second circuit board (3), and a third circuit board (4). On the first circuit board (2), a power module socket (8), an analog signal acquisition module, a digital signal output module, and a group of aviation sockets (6) connected to the second circuit board are provided. On the second circuit board (3), an input signal processing module, a first row of pins (5) connected to the first circuit board, and a second row of pins (10) connected to the third circuit board are provided. On the third circuit board, a CPU module, a 5V to 3.3V module, an analog signal processing stage circuit, an input signal processing stage circuit, a digital signal output control stage circuit, and a second row of pins (11) connected to the second circuit board are provided.

2. The junction box-free feeder terminal according to claim 1, characterized in that: The navigation socket (6) is divided into voltage navigation socket, current navigation socket, and output and input signal navigation socket.

3. A junction box-free feeder terminal according to claim 1, characterized in that: The analog quantity acquisition module includes a current transformer T1 and a transient diode Z1 connected in parallel with the output terminal of the current transformer T1. The current transformer T1 is a voltage transformer or a current transformer.

4. A junction box-free feeder terminal according to claim 1, characterized in that: The switch output module includes a first start-up circuit and a first output circuit. The first start-up circuit consists of resistors R1 and R2 and transistor Q1. The first output circuit consists of resistors R3 and R4, transistor Q2, relay JDQ1, and diode D1.

5. A junction box-free feeder terminal according to claim 1, characterized in that: The input signal processing module includes resistors R5, R6, and R7 connected in series, a Zener diode D2, and an optocoupler U1. One end of a varistor RY1 is connected between resistors R5 and R6. A transient diode Z2 and a capacitor C1 are connected in parallel, with one end connected between resistors R6 and R7. The other end of the varistor RY1, transient diode Z2, and capacitor C1 is connected to the other input terminal of the optocoupler U1.

6. A junction box-free feeder terminal according to claim 1, characterized in that: The analog signal processing stage circuit includes a sampling resistor R8, a first filter capacitor C2, a second filter capacitor C3 connected in parallel, a resistor R9 disposed between the first filter capacitor C2 and the second filter capacitor C3, one end of the second filter capacitor C3 connected to the 3rd contact of the first operational amplifier U2A, a resistor R10 connected between the 1st contact of the first operational amplifier U2A and the 2nd contact of the second operational amplifier U3A, a resistor R11 connected between one end of resistor R10 and the 1st contact of the second operational amplifier U3A, and resistors R12 and R13 respectively connected to the 3rd contact of the second operational amplifier U3A.

7. A junction box-free feeder terminal according to claim 1, characterized in that: The input signal processing stage circuit consists of resistor R14, resistor R15, and capacitor C4.

8. A junction box-free feeder terminal according to claim 1, characterized in that: The switching output control pre-stage circuit includes a second start-up circuit and a second output circuit. The second start-up circuit consists of resistors R16 and R17 and transistor Q3. The second output circuit includes resistor R18 and capacitor C5.

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