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The accuracy is unchanged for a long time, and there is no need to run the school, no installation and transportation, etc.

1) Trademark 2) The name and model of the electric energy meter (such as a single -phase fee control intelligent power meter). 3) Measurement License (CMC) Electric energy meters are used for measurement and settlement. It must have a measurement of measurement products issued by the National Technical Supervision Bureau to be legally produced.

The current transformer is flexible in the secondary time. You can also use soft cables to plug a pins. It can be installed with a fixed lead.

​Magnetic latching relay factory condition for contact closure state,but because carry or installed when subjected to impact,may change state,therefore before use to make its reset.

​The relay coil is represented in the circuit by a long box symbol, and if the relay has two coils, two long boxes are drawn side by side. At the same time, mark the relay word symbol "J" in or beside the long box. There are two ways to represent the contacts of relays: one is to draw them directly on one side of the long box, which is more intuitive. The other is to draw each contact into its own control circuit according to the needs of the circuit connection. Usually, the contact of the same relay and the coil side are marked with the same text symbol, and the contact group is numbered to show the difference.

Electromagnetic Voltage Transformer (PT) and Capacitive Voltage Transformer (CVT) are widely used in power system. Although capacitive voltage transformers and electromagnetic current transformers commonly used in power grids have mature technology and long-term operation and maintenance experience, their measurement linearity is poor, the transient response speed is slow, and the transient error characteristics of electromagnetic current transformers are not ideal.

The current transformer adopts the method of reduced polarity labeling, that is, when the current in the same direction passes through the same polarity section of the primary and secondary windings at the same time

A power transformer is a static machine used for transforming power from one circuit to another without changing the frequency. As there is no rotating or moving parts, a transformer is classified as a static device. Transformer operates on an AC supply. Transformers operate based on the principle of mutual induction.

In the power system, the role of the current transformer is to change the large current into the small current, isolate the secondary loop connected to the relay and measuring instrument from the high voltage system of the primary current, and convert the primary current to the secondary current value of 5A or 1A standards.

In order to ensure the safe and economical operation of the power system, the operation of the power equipment must be monitored and measured.