CN218335426U

CN218335426U - Distribution network automation terminal with expandable module

Info

Publication number: CN218335426U
Application number: CN202221392897.3U
Authority: CN
Inventors: 乐世成; 侯杰; 王超
Original assignee: Shanghai Zenitek Intelligent Technology Co ltd
Current assignee: Shanghai Zenitek Intelligent Technology Co ltd
Priority date: 2022-06-06
Filing date: 2022-06-06
Publication date: 2023-01-17
Anticipated expiration: 2032-06-06

Abstract

The application relates to a distribution network automation terminal with an expandable module, which relates to the field of distribution network automation terminal equipment, and comprises a main module and further comprises: the telemetry module is in signal connection with the main module and is externally arranged on the main module through a first communication line, and the telemetry module collects a voltage signal or a current signal and forwards the voltage signal or the current signal to the main module; the remote signaling module is in signal connection with the main module and is externally arranged on the main module through a second communication line, and the remote signaling module is in signal connection with the switching value wiring terminal and used for collecting state signals and forwarding the state signals to the main module; the remote control module is in signal connection with the main module and the relay, is externally arranged on the outer side of the main module through a third communication line, and receives a control signal output by the main module to control the state of the switch; the telemetry module, the remote signaling module and the remote control module can be independently installed at the outer side of the main module. The present application has the effect of being suitable for use in a confined environment.

Description

Distribution network automation terminal with expandable module

Technical Field

The application relates to the field of distribution network automation terminal equipment, in particular to a distribution network automation terminal with an expandable module.

Background

The distribution network automation terminal is a general name of various remote monitoring and control units arranged on a distribution network and completes functions of data acquisition, control, communication and the like. The distribution automation terminal of the power distribution room is generally provided with a set of independent communication power supply centralized screen assembly installation, can directly acquire real-time operation data of the distribution network and upload the real-time operation data to the distribution network automation system, so that the superior master station system can monitor the operation condition of the distribution network at any time and make a correct decision. Some of the devices can also receive remote control signals of a master station system to carry out remote operation, so that the fault processing time is shortened and the manual maintenance cost is reduced.

In the related art, the network distribution automation terminal is configured with a main module, and one or more of a telemetry module, a remote signaling module, a remote control module, and the like are configured according to the use requirement. But the system is limited by part of old cells in a city or other use environments with limited space, so that on one hand, the existing distribution network automation terminal cannot realize the setting and installation of all functions due to volume limitation; on the other hand, once the demand of the area changes in the later period and the number of lines to be monitored increases, the required modules cannot be added to the automation equipment due to space problems, and the required functions cannot be realized.

SUMMERY OF THE UTILITY MODEL

In order to make distribution network automation terminal be applicable to in the restricted environment, realize the purpose of required function, this application provides the distribution network automation terminal who has expandable module.

The application provides a distribution network automation terminal with can extend module adopts following technical scheme:

distribution network automation terminal with can extend module includes the primary module, still includes:

the telemetering module is in signal connection with the main module and is externally arranged on the main module through a first communication line, and the telemetering module collects a voltage signal or a current signal and forwards the voltage signal or the current signal to the main module;

the remote signaling module is in signal connection with the main module and is externally arranged on the main module through a second communication line, and the remote signaling module is in signal connection with the switching value wiring terminal and used for collecting state signals and forwarding the state signals to the main module; and

the remote control module is in signal connection with the main module and the relay, is externally arranged at the outer side of the main module through a third communication line, and receives a control signal output by the main module to control the state of a switch;

the telemetry module, the remote signaling module and the remote control module can be independently installed at the outer side of the main module.

By adopting the technical scheme, the telemetry module, the remote signaling module and the remote control module are externally connected with the main module and are respectively and independently installed, so that the main module can be arranged in an environment with limited space. On one hand, the functions of the main module can be fully expanded to meet the use requirements, or one or two of the telemetering module, the remote signaling module and the remote control module can be selected according to the requirements, and the number of the main module can be set according to the requirements, so that the required functions can be realized no matter in the environment with limited space during installation or in the environment with limited space during later-stage function addition; on the other hand, the screen group arrangement of each module has great flexibility, and the observation is convenient.

Preferably, the telemetry module comprises a voltage acquisition unit, a current acquisition unit, a data conversion unit, a first control unit, a first DC/DC conversion unit and a first communication unit;

the voltage acquisition unit is provided with a voltage transformer PT, the voltage transformer PT is in signal connection with the data conversion unit, and the voltage transformer PT acquires voltage signals and forwards the voltage signals to the data conversion unit;

the current acquisition unit is configured as a current transformer CT, the current transformer CT is in signal connection with the data conversion unit, and current signals acquired by the current transformer CT are forwarded to the data conversion unit;

the data conversion unit is in signal connection with the first control unit, the data conversion unit outputs a converted conversion signal, and the first control unit receives the conversion signal and forwards the conversion signal to the main module;

the output end of the first control unit is respectively in signal connection with the first DC/DC conversion unit and the first communication unit, the first DC/DC conversion unit receives the signal output by the first control unit and converts the signal to output a first converted signal, and the first converted signal is forwarded to the main module by the first communication unit.

By adopting the technical scheme, the voltage and the current can be respectively acquired, then the acquired data are converted, and then the data are transmitted to the main module through the communication mode formed by the first communication unit after being converted by the first control unit through the first DC/DC conversion unit, so that the acquisition of voltage and current signals is completed.

Preferably, the voltage acquisition unit comprises two acquisition channels, and each acquisition channel acquires and outputs signals of 3 phase voltages and zero voltage;

the voltage acquisition unit comprises two acquisition channels, and each acquisition channel acquires and outputs signals of 3 phase voltages and zero voltage.

Through adopting above-mentioned technical scheme, can gather 2 way voltages and 2 way electric currents respectively, and every way voltage acquisition and every way electric current collection all can gather multiple different signals, and the first control unit of being convenient for calculates and obtains more relevant data according to the multiple signal of gathering.

Preferably, the input end of the voltage transformer PT is in signal connection with a voltage to be collected, a ferrite bead FB is in signal connection between the voltage to be collected and the voltage transformer PT, the output end of the voltage transformer PT is in signal connection with a test point TP, and the test point TP is in signal connection with the input end of the data conversion unit.

By adopting the technical scheme, the voltage signal can be effectively collected and output to the test point TP, and the collection operation in the module to be tested is completed.

Preferably, the remote signaling module comprises a plurality of acquisition terminals, a remote signaling input unit, a first optical coupling isolation unit, a second control unit, a second DC/DC conversion unit and a second communication unit;

the acquisition terminal is connected with the switching value wiring terminal in a signal mode and outputs an acquisition signal; the output end of the acquisition terminal is connected with the input end of the remote signaling input unit in a signal mode; the output end of the remote signaling input unit is in signal connection with the input end of the first optical coupling isolation unit; the output end of the first optical coupling isolation unit is connected with the second control unit in a signal mode;

the output end of the second control unit is respectively connected with the second DC/DC conversion unit and the second communication unit through signals, the second DC/DC conversion unit receives the signal output by the second control unit and converts the signal to output a second conversion signal, and the second conversion signal is forwarded to the main module through the second communication unit.

By adopting the technical scheme, the on-site state information can be collected according to the switching value wiring terminal, and then the on-site state information is forwarded to the first optical coupling isolation unit by the remote communication input unit, the first optical coupling isolation unit achieves the purpose of protecting the circuit, and then the state information is forwarded to the main module by the second control unit in a communication mode formed by the second communication unit after being converted by the second DC/DC conversion unit, so that the collection of the state signal is completed.

Preferably, the remote signaling input unit includes a plurality of resistors, the plurality of resistors are connected in series or in parallel, and an output end signal of the resistor is connected to an input end of the first optical coupling isolation unit.

By adopting the technical scheme, the state signals acquired preliminarily are filtered and then forwarded to the first optical coupling isolation unit, so that the purpose of filtering and stabilizing the signals acquired preliminarily is achieved.

Preferably, the remote signaling modules are provided in plurality, and the connection modes between the remote signaling modules and the main module are all set to be cascade expansion.

By adopting the technical scheme, more data can be collected through the plurality of remote signaling modules, the collection operation can be simultaneously carried out, the collection operation time is reduced, and the collection efficiency is improved.

Preferably, the remote control module comprises a third DC/DC conversion unit, a signal decoding unit, a second optical coupling and isolation unit, and a relay action unit;

the signal decoding unit and the third DC/DC conversion unit are connected with a power supply signal and a control input signal, receive the control signal and decode in real time to output a decoding signal to the second optical coupling isolation unit;

the output end signal of the second optical coupling isolation unit is connected with the relay action unit, the second optical coupling isolation unit forwards a decoding signal to the relay action unit, and the relay action unit receives the decoding signal to control the relay to act.

By adopting the technical scheme, after the control signal is received, the relay can be controlled to be communicated with the on or off action; the signal decoding unit decodes the control signal to ensure the safety of the signal in the transmission process; the second optical coupling isolation unit achieves the purpose of protecting the circuit.

Preferably, the input end of the second optical coupling and isolation unit is connected with a resistor connected in series and a capacitor connected in parallel by signals.

By adopting the technical scheme, the decoding signal received by the second optical coupling isolation unit can be stabilized, so that the transmission of the circuit signal is more stable.

Preferably, the relay action unit comprises 16 output channels, and each output channel is in signal connection with a relay.

Through the technical scheme, 16 relays can be controlled respectively, so that the state of the control circuit is more accurate.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the telemetry module, the remote signaling module and the remote control module are externally connected to the main module and are respectively and independently installed, so that the main module can be arranged in an environment with limited space. On one hand, the functions of the main module can be fully expanded to meet the use requirements, or one or two of the telemetry module, the remote signaling module and the remote control module can be selected according to the requirements, and meanwhile, the number can be set according to the requirements, and on the other hand, the main module has great flexibility in screen assembly arrangement of the modules and is convenient to observe.

Drawings

FIG. 1 is a block diagram of an embodiment of the present application;

FIG. 2 is a schematic diagram of a telemetry module according to an embodiment of the present application;

FIG. 3 is a circuit diagram of a voltage acquisition unit according to an embodiment of the present application;

FIG. 4 is a circuit diagram of a current collection unit according to an embodiment of the present application;

FIG. 5 is a schematic diagram of communication between a telemetry module and a main module according to an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a remote signaling module according to an embodiment of the present application;

fig. 7 is a circuit diagram of a remote signaling input unit according to an embodiment of the present application;

FIG. 8 is a schematic diagram illustrating communication between a remote signaling module and a master module according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of a remote control module according to an embodiment of the present application;

FIG. 10 is a schematic diagram of the communication between the remote control module and the master module according to an embodiment of the present application;

fig. 11 is a circuit diagram of a relay operating unit according to an embodiment of the present application.

Reference numerals: 1. a telemetry module; 11. a voltage acquisition unit; 12. a current collection unit; 13. a data conversion unit; 14. a first control unit; 15. a first DC/DC conversion unit; 16. a first communication unit; 2. a remote signaling module; 21. a collection terminal; 22. a remote signaling input unit; 23. a first optical coupling isolation unit; 24. a second control unit; 25. a second DC/DC conversion unit; 26. a second communication unit; 3. a remote control module; 31. a third DC/DC conversion unit; 32. a signal decoding unit; 33. a second optical coupling isolation unit; 34. a relay operation unit; 4. and a main module.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The embodiment of the application discloses a distribution network automation terminal with an expandable module. Referring to fig. 1, the distribution automation terminal having expandable modules includes a telemetry module 1, a remote signaling module 2, a remote control module 3, and a main module 4, which can be independently installed outside the main module 4. The three remote modules are independently installed on the outer side of the main module 4, and different numbers, positions and whether all the modules are installed and connected can be set according to requirements.

The main module 4 is used for completing data conversion, the telemetry module 1 is used for collecting voltage signals and current signals, the remote signaling module 2 is used for collecting state signals, and the remote control module 3 is used for forwarding control signals to the relay so as to control the relay to perform on-off actions. The state signal refers to the state information of 32 paths of collected fields, including the switch, the position of the ground knife, the energy storage state, the remote and local opening amount and the like; the working state of the power supply is as follows: the alternating current is lost, the battery is under voltage, and the battery is in an activated state; and (4) abnormal alarming: such as signals of device failure, communication anomalies, over-current faults, and over-voltage faults.

The three-remote module is described in detail below.

Referring first to fig. 1 and 2, telemetry module 1 is in signal connection with main module 4 through a first communication line, and telemetry module 1 is externally disposed on main module 4 to form an independent installation.

Specifically, the telemetry module 1 includes a voltage acquisition unit 11, a current acquisition unit 12, a data conversion unit 13, a first control unit 14, a first DC/DC conversion unit 15, and a first communication unit 16.

Referring to fig. 2, the telemetry module 1 is provided with two channels, the voltage acquisition unit 11 can acquire voltage signals of 2 lines, where the voltage signals include 3 phase voltages and 1 zero sequence voltage UA/UB/UC/U0, the current acquisition unit 12 can acquire current signals of 2 lines, and the current signals include 3 phase currents and 1 zero sequence current IA/IB/IC/I0; therefore, each bus loop can realize the acquisition and calculation of phase voltage, line voltage, zero sequence voltage (when no external zero sequence channel exists), positive sequence voltage and negative sequence voltage, and can realize the calculation of parameters such as active power, reactive power, power factor and the like by matching with the bus voltage. The three-phase four-wire and three-wire modes can be selected through configuration.

Further, referring to fig. 2 and 3, the voltage acquisition unit 11 is provided with 8 voltage transformers PT, which are in signal connection with the data conversion unit 13, and the voltage transformers PT acquire voltage signals and forward the voltage signals to the data conversion unit 13, so as to realize the voltage signal acquisition function.

And two input ends of the voltage transformer PT are in signal connection with ferrite beads FB for resisting interference and ensuring the stable operation of the voltage acquisition unit 11. The output end signal of the voltage transformer PT is connected to a test point TP, and the test point TP signal is connected to the input end of the data conversion unit 13. Meanwhile, the resistor and the capacitor are arranged in a matching mode and used for achieving the effects of stabilization, filtering and the like.

Similarly, referring to fig. 2 and 4, the current collecting unit 12 is configured as a current transformer CT, the current transformer CT is in signal connection with the data converting unit 13, and the current signal collected by the current transformer CT is forwarded to the data converting unit 13, so as to realize the current signal collecting function. Two input ends of the current transformer CT are connected with a resistor in parallel for stabilizing voltage.

The input ends of the voltage acquisition unit 11 and the current acquisition unit 12 can be in signal connection with the alternating current wiring terminal so as to realize the purpose of acquisition.

Referring to fig. 2, the data conversion unit 13 is configured as an analog-to-digital converter, and receives the voltage signal collected by the voltage collection unit 11 and the current signal collected by the current collection unit 12. The data conversion unit 13 converts the voltage signal and the current signal into digital signals and outputs them. The output end of the data conversion unit 13 is in signal connection with the first control unit 14, and the converted digital signals are all input into the first control unit 14.

The first control unit 14 is configured as an MCU, and the first control unit 14 is in signal connection with the main module 4 through a first communication unit 16. The first communication unit 16 may be configured as an ethernet, specifically, a LAN, and the first communication line may be configured as a network cable, so that the network signal transmission between the first communication unit 16 and the main module 4 is completed through a network socket.

Meanwhile, the first control unit 14 adjusts the magnitude of the signal through the first DC/DC conversion unit 15 according to the signal requirement, so as to meet the requirement. The first DC/DC conversion unit 15 and the main module 4 complete signal transmission via the air interface.

Referring to fig. 5, in the present embodiment, main module 4 has the capability of extended 4-way telemetry, and the extended modules are connected to main module 4 with their respective independent signals. The main module 4 configures the telemetry parameters of the corresponding lines for each expansion module, after the configuration is completed, the expansion modules start to work, and the telemetry data is transmitted to the main module 4 by each expansion module in real time. In fig. 5, a connection using 1 and 3 two-way telemetry modules is illustrated.

Further, referring to fig. 1 and 6, the remote signaling module 2 is signal-connected to the outside of the main module 4 through a second communication line, thereby being implemented to be independently installed to the outside of the main module 4.

Specifically, the remote signaling module 2 comprises a plurality of acquisition terminals 21, a remote signaling input unit 22, a first optical coupling and isolation unit 23, a second control unit 24, a second DC/DC conversion unit 25 and a second communication unit 26.

Referring to fig. 6 and 7, the collection terminal 21 is connected to the switching value connection terminal in a signal manner, and outputs a collection signal; the open light amount terminal is mainly a signal terminal such as a terminal of a relay.

The output end signal of the acquisition terminal 21 is connected to the input end of the remote signaling input unit 22, and the remote signaling input unit 22 receives the acquisition signal and then forwards the acquisition signal. The remote signaling input unit 22 is configured with a plurality of resistors, capacitors, and diodes for voltage stabilization, filtering, and the like.

The output end signal of the remote signaling input unit 22 is connected to the input end of the first optical coupling isolation unit 23, and the first optical coupling isolation unit 23 is used for isolation, so that the stability of the circuit is ensured.

The output end of the first optical coupler isolation unit 23 is connected to the second control unit 24 through a signal, and the second control unit 24 is configured as an MCU. The output end of the second control unit 24 is respectively connected to the second DC/DC converting unit 25 and the second communication unit 26, and the second DC/DC converting unit 25 receives the signal output by the second control unit 24 and converts the signal to output a second converted signal.

Referring to fig. 8, the second communication unit 26 is configured as RS485, and forms network communication between the second control unit 24 and the main module 4, and the second communication line is set as an RS485 communication line and is connected to the main module 4 by using an extended connection terminal. The second switching signal is forwarded to the main module 4 by the second communication unit 26, so as to complete the status signal collection function.

Since the number of the remote signaling modules 2 may be plural, the connection mode between the plural remote signaling modules 2 is set to be cascade expansion.

Further, referring to fig. 1 and 9, the remote control module 3 is in signal connection with the main module 4 through a third communication line, while being independently disposed outside the main module 4. And meanwhile, the output end of the remote control module 3 is in signal connection with the relay and is used for controlling the action of the relay.

In detail, the remote control module 3 includes a third DC/DC conversion unit 31, a signal decoding unit 32, a second light coupling and isolation unit 33, and a relay action unit 34.

Referring to fig. 9, the third DC/DC converting unit 31 may be configured as a suitable DC/DC converter, and the third DC/DC converting unit 31 is connected to the power signal and the control input aviation plug signal for converting the power signal to ensure the normal operation of the circuit.

The signal decoding unit 32 corresponds to a signal encoding unit provided in the main module 4, and the signal decoding unit 32 is in signal connection with the power signal and the control input aerial plug so as to decode the control signal output by the main module 4 in real time and output the decoded signal.

Referring to fig. 9 and 10, the control signal of the main module 4 has a module distinguishing function, and the extended remote control module can identify a unit required to perform an action in the instruction of the main module 4 according to the control signal decoding, and complete the switching action of the relay.

Referring to fig. 9 and 11, the input end of the second optical coupling and isolating unit 33 is respectively connected to the output end of the third DC/DC converting unit 31 and the output end of the signal decoding unit 32, and is used for receiving the decoded signal and achieving the purpose of isolation protection.

In an actual circuit, the input end of the second optical coupling isolation unit 33 is connected with a resistor connected in series and a capacitor connected in parallel by a signal, so as to achieve the purpose of voltage stabilization. And a diode is connected to the output end signal of the second optical coupling isolation unit 33, so that the signal flow direction is ensured.

The output end signal of the second optical coupling isolation unit 33 is connected to the relay action unit 34, the second optical coupling isolation unit 33 forwards the decoding signal to the relay action unit 34, and then the relay action unit 34 receives the decoding signal to control the relay to act. The relay operating unit 34 is connected to the relay via a switch terminal.

In the embodiment of the present application, the relay action unit 34 includes 16 output channels, and each output channel is connected with a relay in signal connection so as to control a plurality of relays respectively.

The implementation principle of the distribution network automation terminal with the expandable module in the embodiment of the application is as follows: the telemetry module 1, the remote signaling module 2 and the remote control module 3 are externally connected to the main module 4 and are respectively and independently installed, so that the main module 4 can be arranged in an environment with limited space. On one hand, the functions of the main module 4 can be fully expanded to meet the use requirements, or one or two of the telemetry module 1, the remote signaling module 2 and the remote control module 3 can be selected according to the requirements, and meanwhile, the number can be set according to the requirements, and on the other hand, the screen combination arrangement of the modules has great flexibility and is convenient to observe.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. Distribution network automation terminal with expandable module, including main module (4), characterized by still includes:

the telemetry module (1) is in signal connection with the main module (4) and is externally arranged on the main module (4) through a first communication line, and the telemetry module (1) collects a voltage signal or a current signal and forwards the voltage signal or the current signal to the main module (4);

the remote signaling module (2) is in signal connection with the main module (4) and is externally arranged on the main module (4) through a second communication line, the remote signaling module (2) is in signal connection with the switching value wiring terminal, and the collected state signals are forwarded to the main module (4); and

the remote control module (3) is in signal connection with the main module (4) and the relay, is externally arranged on the outer side of the main module (4) through a third communication line, and receives a control signal output by the main module (4) to control the state of a switch;

the telemetry module (1), the remote signaling module (2) and the remote control module (3) can be independently installed on the outer side of the main module (4).

2. The distribution network automation terminal with expandable module according to claim 1, characterised in that the telemetry module (1) comprises a voltage acquisition unit (11), a current acquisition unit (12), a data conversion unit (13), a first control unit (14), a first DC/DC conversion unit and a first communication unit (16);

the voltage acquisition unit (11) is provided with a voltage transformer PT, the voltage transformer PT is in signal connection with the data conversion unit (13), and the voltage transformer PT acquires voltage signals and forwards the voltage signals to the data conversion unit (13);

the current acquisition unit (12) is configured as a current transformer CT which is in signal connection with the data conversion unit (13), and current signals acquired by the current transformer CT are forwarded to the data conversion unit (13);

the data conversion unit (13) is in signal connection with the first control unit (14), the data conversion unit (13) outputs the converted conversion signal, and the first control unit (14) receives the conversion signal and forwards the conversion signal to the main module (4);

the output end of the first control unit (14) is respectively connected with the first DC/DC conversion unit and the first communication unit (16) through signals, the first DC/DC conversion unit receives the signal output by the first control unit (14) and converts and outputs a first conversion signal, and the first conversion signal is forwarded to the main module (4) through the first communication unit (16).

3. The distribution network automation terminal with expandable modules of claim 2,

the voltage acquisition unit (11) comprises two acquisition channels, and each acquisition channel acquires and outputs signals of 3 phase voltages and zero voltage;

the voltage acquisition unit (11) comprises two acquisition channels, and each acquisition channel acquires and outputs signals of 3 phase voltages and zero voltage.

4. The distribution network automation terminal with expandable modules of claim 2,

the input end signal of the voltage transformer PT is connected to a voltage to be collected, a ferrite bead FB is connected between the voltage to be collected and the voltage transformer PT in a signal mode, the output end signal of the voltage transformer PT is connected with a test point TP, and the test point TP is connected to the input end of the data conversion unit (13) in a signal mode.

5. The distribution network automation terminal with expandable module according to claim 1, characterised in that the remote signalling module (2) comprises a plurality of acquisition terminals (21), a remote signalling input unit (22), a first opto-isolation unit (23), a second control unit (24), a second DC/DC conversion unit and a second communication unit (26);

the acquisition terminal (21) is in signal connection with the switching value wiring terminal and outputs an acquisition signal; the output end of the acquisition terminal (21) is in signal connection with the input end of the remote signaling input unit (22); the output end of the remote signaling input unit (22) is in signal connection with the input end of the first optical coupling isolation unit (23); the output end of the first optical coupling and isolation unit (23) is in signal connection with the second control unit (24);

the output end of the second control unit (24) is respectively connected to a second DC/DC conversion unit and a second communication unit (26) through signals, the second DC/DC conversion unit receives the signal output by the second control unit (24) and converts the signal to output a second conversion signal, and the second conversion signal is forwarded to the main module (4) through the second communication unit (26).

6. The distribution network automation terminal with expandable modules according to claim 5, characterised in that the remote signalling input unit (22) comprises a plurality of resistors, arranged in series or in parallel, the output of which is signally connected to the input of the first opto-isolation unit (23).

7. The distribution network automation terminal with expandable module according to claim 1, characterized in that the number of the remote signaling modules (2) is multiple, and the connection mode between the plurality of remote signaling modules (2) and the main module (4) is set to cascade expansion.

8. The distribution network automation terminal with expandable module according to claim 1, characterised in that the remote control module (3) comprises a third DC/DC conversion unit, a signal decoding unit (32), a second light-coupling isolation unit (33) and a relay action unit (34);

the signal decoding unit (32) and the third DC/DC conversion unit are connected with a power supply signal and a control input signal, receive the control signal and decode and output a decoding signal to the second optical coupling isolation unit (33) in real time;

the output end signal of the second optical coupling isolation unit (33) is connected to the relay action unit (34), the second optical coupling isolation unit (33) forwards a decoding signal to the relay action unit (34), and the relay action unit (34) receives the decoding signal to control the relay to act.

9. The distribution network automation terminal with expandable modules according to claim 8, characterised in that the input of the second opto-isolation unit (33) is signally connected with a series resistor and a parallel capacitor.

10. The distribution network automation terminal with expandable module according to claim 8, characterized in that the relay action unit (34) comprises 16 output channels, each of which is signal connected to a relay.