EFT/B (Electrical Fast Transient-Burst) noise immunity testing system under on-load condition of electric energy meter

Abstract

The invention provides an electrical fast transient-burst noise immunity testing system under an on-load condition of an electric energy meter. The electrical fast transient-burst noise immunity testing system comprises a single-phase and three-phase voltage-stabilized power supply, an electrical fast transient-burst generation device, an adjustable simulated load device, a single-phase or three-phase to-be-tested electric energy meter (hereinafter referred to as a to-be-tested object), an error checking device, a photoelectric sampling head and a single-phase or three-phase reference electric energy meter (hereinafter referred to as a reference object); the testeetested object in the system and the reference object are identical products. An output end of the single-phase and three-phase voltage-stabilized power supply is connected with the electrical fast transient-burst generation device and the adjustable simulated load device; the output end of the electrical fast transient-burst generation device is connected with the to-be-tested object; the to-be-tested object is connected with the output end of the adjustable simulated load device; photoelectric pulse output of the to-be-tested object is connected (in non-contact) with the photoelectric sampling head of the error checking device; an input end of the reference object is connected with the error checking device; the photoelectric pulse output of reference object is connected (in non-contact) with the photoelectric sampling head of the error checking device. The system can be used for safely and reliably testing; a filtering device does not need to be additionally arranged completely, so that the cost is low; a method is simple and a result is credible.

Description

technical field [0001] The invention relates to an EFT / B immunity test system under the load condition of an electric energy meter. Background technique [0002] figure 1 As shown, it is the traditional EFT / B test system. Usually, the on-load EFT / B immunity test of the electric energy meter is to add a filter device between the error checking device and the electric energy meter under test to ensure that the power applied to the electric energy meter under test is The high-frequency pulse group interference signal at the line end will not enter the error checking device, ensuring that the work of the error measuring device will not be affected, so as to accurately measure the error change of the tested electric energy meter under the condition of high-frequency pulse group interference. [0003] The disadvantages of this test method are: first, the cost of the filter device is high; second, if the filter effect of the filter device does not reach the ideal effect, then when...

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Problems solved by technology

[0003] The disadvantages of this test method are: first, the cost of the filter device is high; second, if the filter effect of the filter device does not reach the ideal effect, then when the on-load EFT test is carried out, it will be applied to the incoming terminal of the electric energy meter under test. The high-frequency pulse group interference signal will enter the error checking device through the current and voltage connecting line and the electric pulse sampling line, causing the error checking device to be affected or even abnormal. At this time, it is impossible to judge whether the working state of the error checking device is normal. Therefore, it is impossible to judge whether the error of the tested electric energy meter is really qualified, resulting in the inability to ensure that the test results are true and effective

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