Comprehensive tester of current transformer

Abstract

The invention relates to a comprehensive tester of a current transformer, comprising a DSP (Digital Signal Processor) control calculation module, a power amplification output module, an AD (Analog-Digital) sampling module and a data processing module, wherein the DSP control calculation module is used for sending a control signal according to testing parameters set by the data processing module to control the power amplification output module to generate a required voltage source for the current transformer, and is used for controlling the AD sampling module to collect required current transformer data; and the data processing module is used for setting the testing parameters according to a DSP, reading a testing result which is calculated by the DSP control calculation module according to the collected current transformer data, and storing testing data. The comprehensive tester disclosed by the invention adopts a frequency conversion technology to generate required needed voltage source for the current transformer to be detected; the parameters needing to be measured are calculated by sampling module data of the current transformer; and a booster and a current raising device are not required, so that the volume of tester is greatly reduced, the test parameters are complete, the accuracy is high and beneficial guarantees are provided for safe operation of a power grid.

Description

technical field [0001] The invention relates to the technical field of testing instruments, and more specifically relates to an all-digital current transformer comprehensive testing instrument that can be used on site. Background technique [0002] A current transformer is a transformer whose secondary current is substantially proportional to the primary current under normal use conditions, and whose phase difference is close to zero when the connection method is correct. Current transformers are widely used in power systems. The primary winding of the current transformer is connected in series in the power line, and the external circuit of the secondary winding is connected to measuring instruments, meters or relay protection and automatic control devices. Therefore, the accuracy of the current transformer is related to the normal operation of the secondary equipment and the safe and stable operation of the entire power grid. [0003] The traditional current transformer te...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for generating test signals under low voltage conditions to automatically test current transformers for the defects that the existing current transformer testing equipment is large in size and cannot test high saturation voltage current transformers. Comprehensive tester for current transformers for testing

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