Electric energy metering instrument capable of changing meter in electrified mode

Abstract

The invention discloses an electric energy meter capable of changing a meter in an electrified mode. The electric energy meter comprises: a current sampling module, wherein the current sampling moduleis responsible for collecting secondary current, a current loop flowing through the current sampling module is connected with a current loop flowing through the electric energy meter in parallel, andthe secondary current can only flow through the current loop of the current sampling module after a current connecting piece is disconnected; a voltage sampling module responsible for providing working voltage, wherein each phase voltage terminal of the voltage sampling module is connected to a voltage region of the junction box and forms parallel connection with a voltage terminal of the electric energy meter, and the voltage of the voltage sampling module is always equal to secondary voltage; a clock module responsible for calculating the meter changing time; a multiplier responsible for calculating electric quantity; a multiplying power input module used for providing multiplying power of a voltage and current transformer so as to calculate actual electric quantity; a time-sharing voltage module used for providing electricity prices at different moments so as to calculate the electric charge in the meter changing period; and an output module responsible for outputting electric charge data. The electric energy meter does not need to start a threshold, and can calculate the receivable electric quantity in the live-line meter changing period by 100%.

Description

technical field [0001] The invention relates to the field of electric energy metering, in particular to an electric energy meter for a live meter exchange. Background technique [0002] In the case of no power outage failure, the replacement of the electric energy meter generally needs to be replaced with power on. Although this meets the needs of the normal production of the power consumer, but currently the electric energy cannot be accurately measured during the meter replacement period when the power is on. loss. At present, the estimation method is generally used to calculate the power during the live meter change, that is, the power is calculated by multiplying the average power before the user changes the meter by the time for changing the meter. However, because the user power changes from time to time, the average power is not accurate, and the safety work in the early stage of the meter change is not It is completed in an instant, so the time for changing the mete...

AI Technical Summary

Problems solved by technology

[0002] In the case of no power outage failure, the replacement of the electric energy meter generally needs to be replaced with power on. Although this meets the needs of the normal production of the power consumer, but currently the electric energy cannot be accurately measured during the meter replacement period when the power is on. loss

At present, the estimation method is generally used to calculate the power during the live meter change, that is, the power is calculated by multiplying the average power before the user changes the meter by the time for changing the meter. However, because the user power changes from time to time, the average power is not accurate, and the safety work in the early stage of the meter change is not It is completed in an instant, so the time for changing the meter is not accurate. The estimation of the power will cause huge differences between the power supply and the consumer, and it is often impossible to charge the fee during the meter change period.

In addition, safety measures need to be taken before changing the meter with electricity. First, the current of each phase of the junction box is short-circuited phase by phase, and then the three-phase voltage is disconnected one by one to form electrical isolation; and the junction box has one row of terminals for each phase voltage; each phase There are 3 rows of terminals for the current, of which 12 rows of terminals are connected to the incoming line of the junction box, and 13 rows of terminals are connected to the watt-hour meter and the junction box; it can be seen that the existing method of live replacement of the watt-hour meter is complicated to operate and has low work efficiency

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