Fictitious load source for in-situ checking electric energy meter
A technology for simulating load and electric energy, applied in the direction of measuring electrical variables, measuring devices, instruments, etc., to achieve the effect of strong safety protection, complete functions, and easy portability
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[0030] see figure 1 , the electric energy meter on-site verification simulation load source device of the present invention aims at solving the field error verification problem of the electric energy meter when there is no load or a small current load and a low power factor on site. The device is mainly composed of several parts such as voltage zero-crossing comparison, alarm unit, power supply, single-chip microcomputer system, current power amplifier output, current signal phase-shifting amplification, and current protection. The device is provided by an external working power supply of 220V, which is converted into DC ±5V and ±30V through the power supply part to provide working power for the single-chip system, various electronic circuits and current output power amplifiers; in addition, any phase voltage of the terminal boxes A, B, and C of the electric energy metering screen ( The size is 57.7V / 100V / 220V, which can also be output from the meter voltage terminal of the el...
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