Although both network power meters and electric energy meters have the function of "electric energy measurement", it is improper to identify them as the same product or include them in the category of electromagnetic meters. The reasons are as follows: First, there are many products with "electric energy metering" functions, which are newly added every year; second, power meters (Figure 1) and electric energy meters (Figure 2) do face different application objects.
The main distinctions are as follows:
1), use
Power meters are mainly used for power grids, especially for low-voltage electrical parameter measurement, power metering, fault diagnosis, electrical control, alarms, protection and other functions at the user’s end; power meters are used for power settlement between various links in the power grid and between users and users, with additional There is electrical parameter measurement, no diagnosis, control and protection functions.
2), standard
The power meter standard complies with GB/T22264-2008 "Installed digital electrical measuring instrument", JB/T10710-2007 "Low-voltage electrical power monitor", etc.; the electric energy meter standard complies with GB/T17215-2002 "Class 1 and Class 2 static AC Electric Energy Meter, JJG596-1999 "Verification Regulations for Electronic Electric Energy Meters", etc.
3), symbol
The power meter symbol is "", it is a box, and the box is the product model of each enterprise, such as ACR220EL, PM870; the energy meter symbol is, the box has a horizontal "one", which means there is a storage function, and there is a "one" horizontal for Electric energy meters, if not, are other products.
4), model naming
Electric power meter companies can name themselves, or refer to the Electrician Standards Committee to name them as follows:
PAxxx—Digital Display Ammeter
PDxxx—digital display multi-function meter, etc.
"Xxx" is the enterprise record number.
The electric energy meter is uniformly tied by the National Electrical Engineering Standards Committee, and the models are DDSDxxx, DTSFxxx, etc.
"Xxx" is the enterprise record number.
5), product structure
The power monitoring instrument terminal is plug-in type, no "lead seal" structure, no anti-theft measures; the electric energy meter has an anti-theft mechanism-"lead seal". The detachable parts of the electric energy meter are "lead sealed" to prevent man-made opening, operation and modification to prevent electricity theft.
6), the electric energy is cleared
When the power meter is in use, the user can conveniently set the PT and CT transformation ratios, change the energy readings, or clear the electrical energy according to management needs; after the electrical energy meter is "lead sealed", the electrical energy readings are not allowed to be cleared.
7), system compatibility
Power meters are dedicated to smart power distribution systems, and the communication protocol is compatible with power distribution, and is internationally used. Electric energy meters are mainly sold to power grid companies, and power grid companies have their own communication system, mainly DL/T645 protocol.
8), installation method
The power meter is embedded installation, and various sizes of meters can be easily installed in all links of the power distribution system to "monitor" the internal power operation status of the unit; the power meter is installed at the unit's incoming line and is responsible for the settlement of power trade. For wall-mounted installation, it can be installed in a large-space switch cabinet, or an electric meter box can be installed separately.
9), installation environment
The electric meter is installed indoors; the electric energy meter can be installed indoors or outdoors.
