Ring main unit switch control box

Abstract

The utility model relates to the technical field of ring main units, in particular to an interval switch control box of a ring main unit. Incoming and outgoing line interval configurations of the ring main unit are different, the DTU cannot collect and control all interval information, and the switch control box is not connected with the DTU in a communication mode. According to the utility model, a box body is provided with a remote local knob, a switching-on button, a switching-off button, an input aviation plug and an output aviation plug; a closing and opening loop is arranged in the box body, the closing and opening loop comprises a closing loop and an opening loop, the closing loop comprises a remote closing loop and a local closing loop, and the opening loop comprises a remote opening loop and a local opening loop; the output aviation plug is connected with the DTU, and the input aviation plug is connected with the ring main unit spacing mechanism; and the remote local knob, the switching-on button, the switching-off button, the output aviation plug and the input aviation plug are respectively connected with the switching-on and switching-off loop.

Description

Technical Field

[0001] The utility model relates to the technical field of ring network cabinets, in particular to a switch control box for a ring network cabinet. Background Art

[0002] Due to the inconsistent remote control output methods of the existing ring network cabinets for incoming and outgoing lines, a centralized DTU (data terminal unit) and a panel-type FTU (feeder terminal unit) are used in combination. The incoming line interval is passively remotely controlled by the secondary terminal DTU, and the outgoing line interval is actively remotely controlled by the panel-type FTU to address the problem of inconsistent remote control output methods for the incoming and outgoing lines of the ring network cabinets.

[0003] For example, a two-incoming, four-outgoing ring main unit (RMU) uses a centralized DTU to collect three-telemetry electrical information for the first two bays, while panel-mounted FTUs collect this information for the remaining four outgoing bays, completing the three-telemetry data collection for all six bays of the RMU. The remaining four panel-mounted FTUs communicate with the centralized DTU via 232 or 485. A DTU is typically configured for six bays. Because the last four bays have active remote control outputs, the FTUs are used to configure the parameters for the last four bays. This means that the on-site DTUs only use the first two bays, leaving the parameters for the last four bays unused.

[0004] This method has the following problems: the existing panel-type FTU and the centralized DTU communicate through the serial port or network port, and the communication is prone to interruption and packet loss, which affects the three-remote data monitoring and control of the switch, and in severe cases may cause the power outage fault area to expand; the original panel-type FTU needs to be used in conjunction with the DTU, which duplicates the functions of the DTU and wastes resources; the centralized DTU cannot perform active remote control output and cannot directly control the opening and closing of the outgoing line interval. Utility Model Content

[0005] In view of the above technical problems, the utility model provides a switch control box for a ring main unit.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] A ring network cabinet switch control box includes a box body, on which a remote local knob, a closing button, an opening button, an input aviation plug and an output aviation plug are provided;

[0008] The box includes a closing and opening circuit, which includes a closing circuit and an opening circuit, wherein the closing circuit includes a remote closing circuit and a local closing circuit, and the opening circuit includes a remote opening circuit and a local opening circuit;

[0009] The output aviation plug is connected to the DTU, and the input aviation plug is connected to the spacing mechanism of the ring network cabinet; the remote local knob, closing button, opening button, output aviation plug, and input aviation plug are respectively connected to the closing and opening circuits.

[0010] Compared with the prior art, the present invention has the following technical effects:

[0011] The box is equipped with remote and local knobs, allowing users to freely switch between remote and local operation modes; the closing button and opening button provide a convenient way to operate the ring network cabinet switch locally; the box is equipped with input and output aviation plugs, and standardized aviation plug interfaces realize the connection with the DTU and the ring network cabinet interval mechanism respectively; the closing and opening circuits are set in the box, the DTU is connected to the control box, and the control box is connected to the interval to avoid serial or network port communication problems; through power conversion and intermediate relay conversion in the box, it can directly control the opening and closing of the outgoing line interval, solving the problem that the centralized DTU cannot perform active remote control output.

[0012] On the basis of the above technical solution, the following improvements can be made to the above technical solution:

[0013] Furthermore, in the remote closing circuit, the positive pole of the operating power supply is connected to the DTU remote control common terminal, the DTU remote control common terminal is connected to the remote control closing terminal of the DTU through the normally open contact of the closing relay, the remote closing of the DTU is connected to one end of the intermediate relay coil, and the other end of the intermediate relay coil is connected to the negative pole of the operating power supply; one end of the normally open contact of the intermediate relay is connected to the AC power L through the adapter terminal block X1, the normally open contact of the intermediate relay is connected to the closing coil in the spacing mechanism of the ring network cabinet through the input aviation plug, and the other end of the closing coil is connected to the AC power N through the adapter terminal X1.

[0014] The beneficial effect of adopting the above-mentioned further technical solution is that in the remote closing circuit, no matter whether the switch control box is remote or on-site, when the DTU closing relay is actuated, it will trigger the action of the intermediate relay, thereby closing the normally open contacts of the intermediate relay, so that the coil of the ring network cabinet spacing mechanism obtains the appropriate closing voltage, and the switch is closed successfully.

[0015] Furthermore, in the remote tripping circuit, the positive pole of the operating power supply is connected to the remote control common terminal of the DTU, the remote control common terminal of the DTU is connected to the remote control tripping of the DTU through the normally open contact of the tripping relay, and the remote control tripping is connected to the tripping coil in the ring network cabinet mechanism, and the tripping coil in the ring network cabinet mechanism is finally connected to the negative pole of the operating power supply.

[0016] The beneficial effect of adopting the above further technical solution is that no matter whether the switch control box is remote or local, when the DTU trip relay is activated, the trip coil in the mechanism will be energized, completing the successful tripping of the switch.

[0017] Furthermore, in the local closing circuit, the positive pole of the operating power supply is connected to one end of the remote local knob, the other end of the remote local knob is connected to one end of the closing button, the other end of the closing button is connected to one end of the intermediate relay coil, and the other end of the intermediate relay coil is connected to the negative pole of the operating power supply; one end of the normally open contact of the intermediate relay is connected to the AC power L through the adapter terminal block X1, the normally open contact of the intermediate relay is connected to the closing coil in the mechanism through the input aviation plug, and the other end of the closing coil is connected to the AC power N through the adapter terminal X1.

[0018] The beneficial effect of adopting the above-mentioned further technical solution is that, in the local closing circuit, the intermediate relay coil can only be energized when the remote local knob is in the local position and the closing button is pressed, thereby closing the normally open contacts of the intermediate relay, so that the closing coil of the mechanism obtains the appropriate closing voltage, and the switch is successfully closed.

[0019] Furthermore, in the local tripping circuit, the positive pole of the operating power supply is connected to one end of the remote local knob, the other end of the remote local knob is connected to the tripping button, the other end of the tripping button is connected to the remote control common end of the DTU, and the remote control common end of the DTU is connected to the remote control tripping of the DTU through the normally open contact of the tripping relay. The remote control tripping is connected to the tripping coil in the ring network cabinet mechanism, and the tripping coil in the ring network cabinet mechanism is finally connected to the negative pole of the operating power supply.

[0020] The beneficial effect of adopting this further technical solution is that in the local trip circuit, only when the remote local knob is in the local position and the trip button is pressed can the trip coil of the mechanism receive the appropriate trip voltage, successfully opening the switch. By operating the remote local switch, the operator can directly control the trip coil in the ring main unit mechanism to perform the trip operation, improving the directness and convenience of operation.

[0021] Furthermore, the box body is also provided with a mounting position for a closing power operation indicator light and a mounting position for an opening power operation indicator light.

[0022] The box body is also provided with a closing power operation indicator light installation position and an opening power operation indicator light installation position, which are used to install indicator lights to indicate the working status of the power supply and circuit.

[0023] In summary, compared with the prior art, the present invention has the following technical effects:

[0024] (1) The reliability and stability of the ring network cabinet switch control are improved, avoiding the problems of communication interruption or packet loss.

[0025] (2) Reduce costs and avoid functional duplication and resource waste between panel-type FTU and centralized DTU.

[0026] (3) The remote adjustment function is realized, which improves the efficiency and flexibility of power grid dispatching and operation and maintenance.

[0027] (4) Enhanced status monitoring function to ensure the reliability and safety of switch control. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is the remote control principle diagram of the utility model;

[0029] Figure 2 This is the telemetry principle diagram of the utility model;

[0030] Figure 3 This is the remote signaling principle diagram of the utility model;

[0031] Figure 4 This is the power supply principle diagram of the utility model;

[0032] Figure 5 This is the appearance diagram of the utility model.

[0033] In the accompanying drawings, the component names represented by the reference numerals are listed as follows:

[0034] 1. Remote local knob; 2. Closing button; 3. Opening button; 4. Output aviation plug; 5. Input aviation plug. DETAILED DESCRIPTION

[0035] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0036] The inlet and outlet intervals of the ring main unit are configured differently, and the DTU cannot collect and control all interval information.

[0037] This embodiment provides a ring network cabinet switch control box, which includes a box body. The box body is provided with a remote local knob 1, a closing button 2, an opening button 3, a closing power operation indicator light installation position and an opening power operation indicator light installation position. The box body is also provided with an output aviation plug 4 and an input aviation plug 5. The output aviation plug 4 is connected to the DTU, and the input aviation plug 5 is connected to the ring network cabinet spacing mechanism; the box body is also provided with a closing and opening circuit, and the remote local knob 1, closing button 2, opening button 3, output aviation plug 4, and input aviation plug 5 are respectively connected to the closing and opening circuit.

[0038] The DTU provides power for tripping operation and controls the tripping signal and closing signal through the output aviation plug; the tripping signal and closing signal are converted into voltages of corresponding levels in the box and transmitted to the internal interval mechanism of the ring network cabinet through the input aviation plug, thereby realizing control of the interval switch. In local mode, when operating the closing button and the opening button, the current or signal is transmitted to the intermediate relay through the remote local switch and the closing switch. After the intermediate relay is energized, the normally open contact closes, the closing coil is energized or the opening switch is transmitted to the opening coil, thereby realizing direct control of the ring network cabinet mechanism. In remote mode, after receiving the remote control command from the master station, the DTU controls the opening and closing operations of the ring network cabinet mechanism through the closing relay or the opening relay, thereby realizing remote monitoring and control. Specifically, the DTU is connected to the output aviation plug to provide a remote control opening and closing short-circuit output (i.e. closing the opening relay 1TJ or closing the closing relay 1HJ), so that the opening and closing circuit inside the box is closed; since there is a control power supply inside the box, at this time, the coil inside the mechanism in the circuit is energized and the circuit will be opened; or the intermediate relay is energized, the normally open contact is closed, so that the closing coil HQ inside the mechanism in the lower 220V circuit is energized and closed.

[0039] In this embodiment, the closing circuit comprises a remote closing circuit and a local closing circuit. During remote closing, the DTU controls closing via closing relay 1HJ. During local closing, pressing the closing button energizes the intermediate relay coil, closing the normally open contacts and, in turn, energizing the closing coil within the ring main unit (RMU), completing the closing process. One end of the remote local switch is connected to the positive terminal of the operating power supply, and the other end is connected between closing relay 1HJ and the internal closing coil HQ.

[0040] Specifically, such as Figure 1 In the remote closing circuit, the positive pole of the operating power supply is connected to the remote control common terminal of the DTU, and the remote control common terminal YKCOM of the DTU is connected to one end of the remote control closing terminal YKH through the closing relay 1HJ; the other end of the remote control closing terminal YKH is connected to one end of the intermediate relay; the intermediate relay will close its normally open contact after receiving the signal; after the normally open contact of the intermediate relay is closed, the AC 220V power provided by the device is supplied to the closing coil in the mechanism, thereby triggering the closing operation.

[0041] In the local closing circuit, the positive pole of the operating power supply is connected to one end of the remote local knob, the other end of the remote local knob 1 is connected to one end of the closing button, the other end of the closing button is connected to one end of the intermediate relay coil, and the other end of the intermediate relay coil is connected to the negative pole of the operating power supply; one end of the normally open contact of the intermediate relay is connected to the AC power L through the transfer terminal block X1, and the normally open contact of the intermediate relay is connected to the closing coil in the mechanism through the input aviation plug, and the other end of the closing coil is connected to the AC power N through the transfer terminal X1.

[0042] After the closing button is pressed, the intermediate relay coil is energized, and the normally open contacts JDQ:3 and JDQ:5 are closed, so that both ends of CZ1:3 and CZ1:2 receive 220V AC power, and then the coil inside the mechanism is activated to complete the closing.

[0043] The terminal block inside the control box is connected to a closing power operation indicator light, which is connected in parallel to both ends of the AC power L and AC power N to indicate the operating status of the closing power.

[0044] In this embodiment, the trip circuit includes a remote trip circuit and a local trip circuit. During remote tripping, the DTU controls the tripping via the trip relay 1TJ. During local tripping, the tripping button is pressed to energize the tripping coil within the ring main unit, completing the trip. In local mode, local opening and closing operations can be performed using the local opening and closing buttons. In remote mode, local opening and closing operations are disabled, and the DTU receives remote control commands from the master station for control.

[0045] In the remote trip circuit: The positive pole of the operating power supply is connected to the remote common terminal YKCOM of the DTU, which is then connected to the remote trip terminal of the DTU via the trip relay 1TJ. The remote trip terminal is further connected to the trip coil within the ring main unit, which is ultimately connected to the negative pole of the operating power supply, forming a complete circuit. When the DTU receives a trip command from the master station, it closes the remote common terminal YKCOM with the remote trip terminal YKF, closing the circuit and achieving tripping.

[0046] Local trip circuit: The positive pole of the operating power supply is connected to one end of the remote local knob, the other end of which is connected to the trip button. The other end of the trip button is connected to the remote common terminal of the DTU. The DTU's remote common terminal is connected to the DTU's remote trip via the normally open contact of the trip relay. The remote trip is connected to the trip coil inside the ring main unit, which is ultimately connected to the negative pole of the operating power supply. When the trip button is pressed, the DC48V or DC24V voltage provided by CZ3:3 and CZ3:4 acts on CZ1:9 and CZ1:10, actuating the trip coil inside the unit and completing the trip.

[0047] At the local location, the opening and closing operations can be realized by the local opening and closing buttons. At the remote location, the local opening and closing operations will be invalid. Figure 1 The opening and closing circuits of the central protection and remote control are not controlled by the remote local 1SK knob. This design is to prevent the circuit breaker from being opened in time to cut off the fault when the line is detected to be faulty in the local state. Whether in remote or local state, the on-site intervals can be opened and closed.

[0048] A trip power operation indicator light is connected between the positive and negative poles of the operating power supply to indicate the working status of the trip power supply.

[0049] In this utility model, the closing and opening circuit design of the ring main unit switch control box fully considers the requirements of both remote and local operation modes. Through the remote control function of the DTU and the switching of remote and local switches, flexible control of the switches within the ring main unit mechanism is achieved. Furthermore, indicator lights provide intuitive information on the operating status of the power supply and circuits. Furthermore, the 220V power supply circuit provides the necessary power support for the energy storage circuit within the ring main unit mechanism.

[0050] Specifically, refer to Figure 5 The input is a rectangular aerial plug, and the output is two circular aerial plugs. The input is a 24-inch rectangular aerial plug, with the other side connected to the ring main unit spacing mechanism. The outputs are the two circular aerial plugs on top, one for output control and one for output current, and are connected to the DTU. The input is an old, typically standard, aerial plug left behind after the old FTU is removed and plugged directly into the input of the control box. The rectangular output is a device with standardized interfaces. The DTU remote control output has only three wires: remote common, remote opening, and remote closing. The outgoing interval remote control has four wires: closing +, closing -, opening +, and opening -. These voltage levels are different, requiring an intermediate relay to connect the remote control wires of different voltage levels. The selected relay's voltage level matches the opening circuit voltage level and uses the same power supply.

[0051] In this embodiment, an input aviation plug installation position and an output aviation plug installation position are provided on the box body, and the input aviation plug and the output aviation plug are used to transfer and transmit the three remote control signals.

[0052] like Figure 2 , Figure 2 This is the telemetry principle diagram of the utility model. The current of the 24-core rectangular input aviation plug is directly transferred to the 6-core output aviation plug.

[0053] like Figure 3 , Figure 3 This is the remote signal principle diagram of the utility model. The switch closed, un-energy-stored, and open positions of the 24-core rectangular input aviation plug are directly connected to the 10-core output aviation plug. The two remote signal common terminals of the output aviation plug are connected, one to the remote signal common terminal of the secondary mechanism and the other to the DTU remote signal common terminal; the remote remote signal is collected through the normally closed contact of the remote knob.

[0054] like Figure 4 The power supply voltage of the input aviation plug is transferred to the energy storage circuit in the ring network cabinet mechanism.

[0055] The system uses reused original aviation plugs for input and standardized aviation plugs for output. This simplifies the replacement process and facilitates subsequent maintenance and troubleshooting. The switch's three remote control data is connected to the DTU via the output aviation plug cable, eliminating communication issues and preventing communication problems from affecting switch control and data collection. The system fully utilizes the DTU's multi-interval function to implement remote switch adjustment, avoiding waste of outgoing line interval functions and resources. It enables the switch's opening and closing operations, selection of remote and local remote control interlocks, and monitoring and control of power supply. It can transform centralized DTU passive remote control into active outgoing line interval remote control, reducing fault maintenance costs.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A ring main unit switch control box, characterized in that: It includes a box body, on which a remote local knob, a closing button, an opening button, an input aviation plug and an output aviation plug are provided; The box includes a closing and opening circuit, which includes a closing circuit and an opening circuit, wherein the closing circuit includes a remote closing circuit and a local closing circuit, and the opening circuit includes a remote opening circuit and a local opening circuit; The output aviation plug is connected to the DTU, and the input aviation plug is connected to the spacing mechanism of the ring network cabinet; the remote local knob, closing button, opening button, output aviation plug, and input aviation plug are respectively connected to the closing and opening circuits.

2. A ring main unit switch control box according to claim 1, characterized in that: In the remote closing circuit, the positive pole of the operating power supply is connected to the DTU remote control common terminal, the DTU remote control common terminal is connected to the remote control closing terminal of the DTU through the normally open contact of the closing relay, the remote control closing terminal of the DTU is connected to one end of the intermediate relay coil, and the other end of the intermediate relay coil is connected to the negative pole of the operating power supply; one end of the normally open contact of the intermediate relay is connected to the AC power L through the adapter terminal block, the normally open contact of the intermediate relay is connected to the closing coil in the interval mechanism of the ring network cabinet through the input aviation plug, and the other end of the closing coil is connected to the AC power N through the adapter terminal.

3. The ring main unit switch control box according to claim 1, characterized in that: In the remote tripping circuit, the positive pole of the operating power supply is connected to the remote control common terminal of the DTU, and the remote control common terminal of the DTU is connected to the remote control tripping of the DTU through the normally open contact of the tripping relay. The remote control tripping is connected to the tripping coil in the ring network cabinet mechanism, and the tripping coil in the ring network cabinet mechanism is finally connected to the negative pole of the operating power supply.

4. The ring main unit switch control box according to claim 1, characterized in that: In the local closing circuit, the positive pole of the operating power supply is connected to one end of the remote local knob, the other end of the remote local knob is connected to one end of the closing button, the other end of the closing button is connected to one end of the intermediate relay coil, and the other end of the intermediate relay coil is connected to the negative pole of the operating power supply; one end of the normally open contact of the intermediate relay is connected to the alternating current L through the adapter terminal block, the normally open contact of the intermediate relay is connected to the closing coil in the mechanism through the input aviation plug, and the other end of the closing coil is connected to the alternating current N through the adapter terminal.

5. The ring main unit switch control box according to claim 1, characterized in that: In the local tripping circuit, the positive pole of the operating power supply is connected to one end of the remote local knob, the other end of the remote local knob is connected to the tripping button, the other end of the tripping button is connected to the remote control common end of the DTU, and the remote control common end of the DTU is connected to the remote control tripping of the DTU through the normally open contact of the tripping relay. The remote control tripping is connected to the tripping coil in the ring network cabinet mechanism, and the tripping coil in the ring network cabinet mechanism is finally connected to the negative pole of the operating power supply.

6. The ring main unit switch control box according to claim 1, characterized in that: The box body is also provided with a mounting position for a closing power operation indicator light and a mounting position for an opening power operation indicator light.

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