Single-phase pre-payment electric energy control device and electric energy metering system

Abstract

The invention provides a single-phase prepayment electric energy control device and an electric energy metering system, which is suitable for the electric energy metering field. The single-phase prepayment electric energy control device comprises a prepayment controller, a double-loop magnetic holding relay arranged outside the prepayment controller, wherein, the prepayment controller is used formetering and monitoring the electric power consumption of users in real time, and when the electric power consumption of the users exceeds the set value, a warning switch-off signal is output; and the double-loop magnetic holding relay is connected with the prepayment controller and receives the warning switch-off signal, and meanwhile, live line and null line loops are disconnected. Since the single-phase prepayment electric energy control device adopts the external double-loop magnetic holding relay, when the electric quantity purchased in advance is used up, the null line loop and the liveline loop can be simultaneously disconnected, and the invention has the advantages of high reliability, good security, low cost and tamper preventing function.

Description

technical field [0001] The invention belongs to the field of electric energy metering, in particular to a single-phase prepaid electric energy control device and an electric energy metering system. Background technique [0002] With the continuous improvement of living standards, the electricity load of residents is also increasing, from 5 (20) A in the past to 10 (40) A or 10 (60) A, or even 20 (80) A now. The current of the electric load exceeding 60A is called large current; there are usually two ways to measure the user's electricity consumption of the large current load: one way is to install two 10 (40) A single-phase prepaid energy meters, using this method It is necessary to measure and calculate the electricity load first, and then distribute it equally to the two energy meters; at the same time, it is necessary to use two prepaid cards to buy electricity, and it is inconvenient to use single-circuit metering and single-circuit switching; another way is to introduce...

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Problems solved by technology

[0002] With the continuous improvement of living standards, the electricity load of residents is also increasing, from 5 (20) A in the past to 10 (40) A or 10 (60) A, or even 20 (80) A now. The current of the electric load exceeding 60A is called large current; there are usually two ways to measure the user's electricity consumption of the large current load: one way is to install two 10 (40) A single-phase prepaid energy meters, using this method It is necessary to measure and calculate the electricity load first, and then distribute it equally to the two energy meters; at the same time, it is necessary to use two prepaid cards to buy electricity, and it is inconvenient to use single-circuit metering and single-circuit switching; another way is to introduce three-phase Electricity, using 3×30(100)A prepaid energy meters, this method leads to high cost

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