Q:What is the voltage imbalance of smart energy meters?
When any of the three-phase voltages is greater than the critical voltage of the energy meter, the voltage imbalance rate is greater than the set voltage imbalance rate limit, and the duration is greater than the set voltage imbalance rate judgment delay time, this This working condition is voltage unbalance.
Q:What is the current imbalance of smart energy meters?
When any of the three-phase currents is greater than 5% of the rated (basic) current, the current imbalance rate is greater than the set current imbalance rate limit, and the duration is greater than the set current imbalance judgment delay , This working condition is current unbalance.
Q:What is the voltage (current) imbalance rate of smart energy meters?
In a three-phase power supply system, the voltage (current) unbalance rate is the difference between the maximum phase voltage (current) and the minimum phase voltage (current) as a percentage of the maximum phase voltage (current).
Q:What is starting current of meter?
The starting current is the current value that determines the relevant characteristics of the meter, also called the calibration current value, which is determined by the starting current of the electric energy meter. Generally, the greater the multiple of the meter, the more accurate the measurement at low current. The multiple algorithm of the meter is based on the maximum rating. Current/basic current. That is, the current that the meter needs to reach when it starts.
Q:What are the general minimum starting currents?
Generally there are 0.2%, 0.4%, 0.5%. Take the current of 10 (80) A, IB 0.5% as an example. The starting current of this electric meter is 10*0.5%=0.05, which means that the electric current must reach 0.05 before the electric meter starts to work and start measuring.
Q:What is the starting current value for direct and mutual inductance?
For the direct connection type electric energy meter, the starting current is: 0.004Ib
For the electric energy meter with mutual inductance access, the starting current is: 0.002In.