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# Electricity meter general knowledge introduction

Views: 0     Author: Site Editor     Publish Time: 2019-09-29      Origin: Site

Our daily life can not be separated from electricity, but many people do not know much about electricity, in order to better use this ubiquitous energy, changsha she for electronic technology co., ltd. now to popularize some of the electricity related knowledge.

Q: what is the unit of electrical energy?

Answer: the unit of electric energy is "kilowatt-hour" (kWh), commonly known as "Celsius" or "degree" (℃)

Q: what instrument is used to measure "how much electricity is used"?

Answer: the measure appliance that records how much electric energy the customer USES is called electric energy measure device. It includes various types of electricity meters, voltage and current transformers for metering and their secondary circuits, electrical energy metering cabinets (boxes), etc. Electric energy metering device is the "scale lever" for electric energy metering and settlement between power supply enterprises and power customers. General residential customers only use single-phase meters to record electricity consumption.

Q: what kinds of electricity meters do you have?

Answer: the meter that USES to measure electric energy calls watt-hour meter, call watt-hour meter again, kilowatt hour meter. Electricity meters can be classified into:(1) by phase: single-phase, three-phase three-wire, three-phase four-wire, etc.(2) by function and purpose: active power meter, reactive power meter, maximum demand meter, multiple rate meter, multi-function meter, copper loss meter, iron loss meter, etc.(3) according to the working principle: induction type, electronic type, electromechanical type, etc.

Q: what is the difference between electronic and mechanical watches?

A: there is no difference in the measurement methods and results. But there is a fundamental difference in the internal structure, one called static (or electronic), one called inductive (or mechanical). Induction table as the name suggests is the use of electromagnetic induction principle made. Static meter is based on the principle of electrical energy measurement using electronic circuit to achieve measurement.Ask: what call time division charge electricity meter?Answer: time-of-use billing watt-hour meter also calls much rate table or compound rate table, it is a kind of measure measure that in recent years is needed for meeting the demand of price of time-of-use of peak valley and offer. It can be divided according to the predetermined peak, peak, valley, peacetime section, respectively measure the electricity consumption of peak, peak, valley, peacetime section, so as to use different electricity prices for different periods of electricity consumption. The use of multiple rate table can give play to the regulating role of electricity price, encourage customers to adjust the load of electricity, shift the peak and fill in the valley, make rational use of power resources, and fully tap the potential of power distribution, supply and electrical equipment.

Q: what is the watt-hour meter constant?

A: the number of turns required to turn the turntable of an energy meter per kilowatt · hour (kWh) is called the constant r/kWh or revolution/(kWh) of the meter. If the watt-hour meter constant is 1200r/kWh, it means that the watt-hour meter will measure 1kWh for each revolution of 1200r/kWh.

Q: what do you mean by current 5 (10) A, 10 (20) A, 5 (20) A on the nameplate of the electricity meter? What's the difference?

Answer: the current value before bracket calls basic current, it is the current value that serves as computation load cardinal number, the current inside bracket calls rated maximum current, it is to be able to make electric energy meter works normally for a long time, and error and temperature rise satisfy the maximum current value of regulation requirement completely.According to the requirements of the regulations, the basic current of the direct-access watt-hour meter should be determined according to the rated maximum current and overload factor, among which, the rated maximum current should be determined according to the approved load capacity of the customer; Overload multiple: if the actual load current of the watt-hour meter in normal operation reaches more than 30% of the maximum rated current, 2 times of the meter shall be taken. If the actual load current is lower than 30%, take 4 times table. Guangzhou GENY Electric Co.,Ltd
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