Three-phase energy meters must be wired in a positive phase sequence. This is a problem that many people ignore. Because the three-phase energy meter is verified in the positive phase sequence in the check, if the phase sequence is wrongly connected during installation, additional errors will be added. The following small series introduces three-phase energy meter installation.
Three-phase energy meter installation wiring method:
In the power system, according to the need of safe operation, the neutral point of the transformer is divided into three situations: direct grounding, ungrounding and incomplete grounding. The three-phase and three-wire active energy metering methods are widely used for electric energy metering of power systems and power users. The proportion of electric energy measured by them is relatively large. Except for a few high-supply and low-meter methods, three-phase three-wire active energy metering devices are important. Electric energy metering device.
Three-phase three-wire energy meter wiring is mainly divided into two types, one is a direct access type, the other is through the transformer access type.
(1) Direct access:
The three-phase three-wire active energy meter uses and does not have the neutral system three-phase electric energy measurement, regardless of the nature of the load and whether the load is balanced, can measure. As shown below.
(2) Through the transformer access type:
The voltage and current terminals of the transformer connected three-phase three-wire energy meter are also divided into two types: public and separate.
Three-phase three-wire watt-hour meter is connected via current transformer (current and voltage lines are shared)
Three-phase three-wire power meter is connected by current transformer (current and voltage lines are separated)
In the same way, it is based on the method of sharing and separating current and voltage lines when transformers are connected in the case of low voltage metering.
What are the causes of the three-phase power meter alarm light:
The long warning light of the household smart meter may be a problem with the meter, and it may be that the power does not meet the standard.
There are many reasons for the alarm: lack of phase, loss of pressure, reverse sequence, battery alarm, of course, does not rule out the cause of the meter, and sometimes the circuit of the alarm lamp that there is a problem will also appear the alarm light is always on.
1, first of all to correctly distinguish between the meter's light display, is the role of alarm or live display.
2. If the alarm light is on, it means that there is a fault and it will be extinguished after eliminating the fault. This usually requires manual intervention. Such as arrears, battery undervoltage, remote control system operation, lack of phase, loss of pressure, etc., if it is arrears, need to pay electricity; if the battery is under voltage, need to replace the battery; if it is a remote control system action, lack of phase, Loss of pressure, etc., need to call the power department to repair service calls to resolve.
3. If the lamp with the live display function is on, then the lamp will always be on or it will flash periodically as long as there is power supply. This is a normal display and can be ignored.
The above is related to the introduction of three-phase energy meter installation wiring method, if you want to learn more relevant information, please pay more attention to this site, will provide you with more complete, more detailed, updated information information.
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