Q:Are you a factory or trading company?
As a manufacturer and supplier of electricity meters.Our sales center was located in Shanghai, with factory in Tongxiang city, Zhejiang province.
Q:How is your quality and price?
We have strict and complete quality control system, and most favorable price will be given after evaluating your design and needs.
Q:What is warranty of your products?
Generally speaking,the same as our industry,usually 2 years for components,15~20 years for meters, based on pratical situation.
Q:What is the damage rates?
Around 1%, in fact we believe that's conservative estimate value, no matter how we'll pay high attention on defective products and take action to make up our loss.
Q:What is the full voltage loss condition of smart electric energy meter?
In the three-phase power supply system, if the three-phase voltage is lower than the critical voltage of the energy meter, and there is any phase or multi-phase load current greater than 5% of the rated (basic) current, and the duration is greater than 60s, this type of work The condition is called total decompression.
Q:What is the phase-off working condition of smart electric energy meter?
In a three-phase power supply system, when the voltage of a certain phase is lower than the set upper limit of the phase failure event voltage, and the phase current is less than the upper limit of the set phase failure event current, and the duration is greater than the set phase failure event To determine the delay time, this kind of working condition is called phase failure.
Q:What is the loss-of-current operating condition of smart electric energy meter?
In a three-phase power supply system, at least one of the three phases' load current is greater than the lower limit of the current trigger event, and the voltage of a certain phase is greater than the lower limit of the voltage trigger event, and the current of this phase is less than the set current trigger event. When the current triggers the upper limit value, and the duration is greater than the set delay time of the current loss event determination, this working condition is called the phase current loss.
Q:What is the power-off condition of smart energy meters?
The supply voltage of the single-phase energy meter is lower than the starting working voltage of the energy meter; the supply voltage of the three-phase energy meter is lower than the critical voltage of the energy meter, and the three-phase load current is not more than 5% of the rated (basic) current. This is called power down.
Q:What is the reverse working condition of smart electric energy meter?
In a three-phase power supply system, when the direction of the total active power changes direction, at the same time, the active power is greater than the set active power reverse event active power trigger lower limit, and the duration is greater than the set power reverse event judgment delay time This kind of working condition is called power flow reversal.
Q:What is the critical voltage of a smart energy meter?
The minimum voltage that the smart energy meter can start to work is the critical voltage, which is generally 60% of the reference voltage. The critical voltage stipulates the minimum voltage for the smart energy meter to start work, which is the specified maximum limit, and the minimum power for the start work of the energy meter design can be lower than this value. Starting the work means that the energy meter can measure, display, and record events normally. It is not mandatory to respond to backlight lighting, communication, tripping, and alarm output. For three-phase energy meters, when the voltage of each phase reaches 60% of the lower limit of the reference voltage or when the single-phase voltage reaches 85% of the reference voltage, the energy meter can start working; for single-phase energy meters, when the voltage reaches When the reference voltage is 60%, the energy meter can start working.