Application of DC Current Meters in Substation DC Measurement

At present, unmanned substations are popularized in the power system. Although the dispatch center can obtain real-time information on the operation of the substation through the telecontrol channel, only a small amount of important information can be obtained for the DC part. It cannot detect the abnormal operation of the system at the beginning, and does not send scheduling until the long-term abnormal operation develops into a fault.

If the abnormal phenomenon can be detected and dealt with in time when it first appears, the abnormal expansion can be avoided. There are many substations and few maintenance personnel, so it is impossible to guarantee the completion on schedule and quantity. In this case, the DC current meter and the DC monitoring system came into being. Its main function is to send the DC equipment information of each substation to the monitoring center, and the monitoring center can also send control commands to each station.

In this way, the maintenance personnel can not only monitor the DC equipment in the monitoring center, but also timely discover the abnormal state of the equipment operation and deal with it in time.

The system in the substation mainly includes the following key parts:

1. DC current meters for the communication channel selection

All kinds of information sent by the substation to the dispatch center are all transmitted through the telecontrol channel, and these information have high real-time requirements.

At present, in addition to the remote control channel, there is also a telephone channel in the substation. This channel is generally used by the staff when working on site, and other auxiliary systems such as security alarm systems are used when necessary. Usually this channel is in an idle state, but must be set, so it can be used as the information channel of the DC monitoring system.

2. DC current meters for the system monitoring center

The monitoring center is a background computer system, which runs on a PC. It is responsible for sending commands to the monitors of all substations, receiving their operation data, and processing and analyzing the data. The monitoring center and the monitor are a one-to-many system.

The software of the monitoring center mainly includes the following parts: the function of the communication module is to dial up the monitor modem of the substation, establish a communication link, and the data processing module organizes various data into the database to form a historical database of all DC equipment in the substation. The main control software provides a man-machine interface, displays data on the screen, and can also perform various data analysis. At the same time, it also sends the operator's control commands to the distance in the form of data packets, which is the core of the system.

3. DC current meters for the monitor

The monitor is a collection device installed in each substation. It collects the data and operating status information of each DC device, controls it, and sends the data to the monitoring center and other monitoring units. The monitor contains some functional modules. The function of its communication module is to prepare for communication for data transmission. Its data transceiver module is mainly responsible for the data transceiver business after the communication link is established. The I/o module function provides the human-machine input interface of the monitor, and the monitor collects and controls the quantity of each DC equipment.

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