The so-called creeping refers to the self-rotation of the electric energy meter. According to the regulations, when there is no current in the current line of the electric energy meter, and the voltage applied to the voltage coil is 80% to 110% of the rated value, the creeping motion should not exceed 1 full rotation within a limited time.
The creeping of the electric energy meter during operation is a phenomenon that is often seen and complicated, and the reasons are various. After careful investigation and analysis and testing on the spot, it is found that there are roughly five reasons for the potential of the electric energy meter:
(1) There is a slight load, such as the indicator light on the switchboard, the light switch, the line load doser, the voltage transformer, the transformer, the no-load operation of the welder, and the power factor is too low.
(2) The creep test failed. In general, the energy meter has a slight positive and negative error.
(3) The electric energy meter is not wired according to the positive phase sequence power supply.
(4) The three-phase voltage is seriously unbalanced.
(5) The current transformer is short-circuited or there is leakage, the insulation of the line is broken, and the current coil of the electric energy meter is burnt.
According to the above reasons, the following measures should be taken:
(1) If there is a slight load causing the sneak, check the cause of the sneak and explain to the user patiently and explain the situation.
(2) According to the electric energy meter verification procedure, the light load error is generally not excessive.
(3) Before installing the electric energy meter, the phase sequence must be measured at the site, and the power supply should be connected according to the positive phase sequence.
(4) Assist the user to adjust the power load, and achieve the relative balance of three-phase current and voltage.
(5) If the electric energy meter sneaks due to the fault, find the cause of the fault in time, check the electric energy meter, the transformer, modify the wiring, burn it with electric appliances, and so on.
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