What Is Communications Management?

The communication management machine is also called DPU. The communication management machine is generally divided into three parts.

Communication management machine

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The communication management machine is also called DPU. The communication management machine is generally divided into three parts.

Communication management machine is also called DPU

It has multiple downlink communication interfaces and one or more uplink network interfaces, which is equivalent to a front-end computer, that is, a monitoring computer. It is used to organize and summarize the communication data of all intelligent monitoring / protection devices in a substation and send them to the superior in real time. The main station system (monitoring center background machine and DCS), completes the functions of remote signaling and telemetry. On the other hand, it receives the order from the background machine or DCS and forwards it to the intelligent series units in the substation, and completes the setting and closing of remote control or device parameters of each switchgear in the plant, and realizes remote control and remote adjustment functions. It should also be equipped with multiple serial interfaces to communicate with other intelligent devices in the plant.

The communication management machine is generally used in the substation, dispatching station, and the communication management machine controls the downstream Rtu equipment through the control platform to realize the collection of remote signaling, telemetry, remote control and other information, and feedback the message back to the dispatch center. Then, the control center administrator Through the processing and analysis of the message, the command to be executed is selected to achieve the goal of the remote output scheduling command.

The communication management machine is generally divided into three parts:

1. Scheduling platform operator

2. Service section

3. Management part

The ultimate goal of the communication management machine is to realize the output of the remote control table. Through the output of the remote control table, communication between different manufacturers and communication machines can be realized.

1) With multi-network function, users can configure different communication interface cards according to the actual network conditions to form a variety of network structures required by users.

Can form RS232 full duplex star network structure;

Can form a half-duplex bus structure of RS485 bus;

Can form a full-duplex bus structure of RS422 bus;

Can form the main bus structure of CAN bus;

can form a local area network through the Ethernet function provided by TXJ-2.

2) Multi-serial port function The communication management machine has the function of flexibly configuring the serial port. It can configure the serial port according to the needs of the user. The configuration range is 1-23, and the number of different serial ports for different interface cards.

3) The communication management machine with multi-protocol functions can implement a variety of international and domestic communication protocols and internal communication protocols provided by other equipment manufacturers. The specific protocols are as follows:

DL / T 643-1997 transmission protocol 101 supporting standard protocols for basic telecontrol tasks;

DL / T 667-1999 transmission protocol 103 standard specifications for supporting relay protection equipment information interface;

DL / T 645-1997 transmission protocol multi-function energy meter communication protocol;

DL 451-91 Circular Telecontrol Protocol (CDT)

Disa system telecontrol protocol;

1801 protocol;

DNP3.0 protocol;

MODBUS protocol;

Internal dedicated protocols of other manufacturers

4) The host and communication interface card of the communication management machine with hot-swap function have hot-swap function. When a certain board is found to be faulty, you can remove this board and insert a spare board of the same model. To achieve zero-on-line system maintenance and system failure recovery. This function is especially important for a dual-system hot standby redundant system, because it does not affect system operation when the host is replaced

5) GPS satellite time synchronization function When the GPS satellite time synchronization function board is configured, the communication management machine can receive the satellite clock and can time synchronize the equipment connected to the communication management machine.

6) The power supply system with hot standby redundancy can be configured with two power supplies at the same time on the communication management machine. When one power supply fails, the other power supply can immediately supply power to the system without stopping the system.

7) Flexible and convenient configuration tool Complete Chinese-made configuration tool software, which is convenient for commissioning personnel to configure the communication management machine.

8) Rich debugging methods The communicator provides two communication ports on the front panel for debugging. You can perform maintenance and debugging by connecting to the HyperTerminal that comes with Windows, without the need to install additional debugging software. At the same time, it provides the operation functions of monitoring communication messages, viewing, modifying the system remote signaling, telemetry, electricity and other databases. And some other special debugging features.

8) With remote debugging and maintenance function, it can remotely monitor the receiving and sending data of each communication interface of the communication management machine; it can remotely monitor and modify the database data of each communication interface; it can remotely upload and download configuration data and download and run program.

9) With five-proof lockout functionWhen background monitoring, remote dispatching and other equipment or systems want to operate other control equipment through the communication management machine, the communication management machine will make five-proof logic judgments on the control operation. Only the control operation can be executed, otherwise it will be rejected.

10) Black box function According to the configuration, the communicator can have a black box function, which can record the operation of the communicator, capture all the control commands controlled by the communicator, and can also record the SOE generated by all the sub-stations for accident analysis.

11) Remote signal collection and remote control output function If the switch input and output board is configured, the communicator can also perform a small amount of remote signal collection and remote control output, which is used for certain specific occasions, which is convenient for users and saves investment.