Current transformer error check test system

Abstract

The present invention discloses a current transformer error check test system. The system comprises: P1 and S1 experiment terminals which are respectively accessed into the primary side and the secondary side of the current transformer; A, B, C and N test terminals which are accessed into the load side of the current transformer for automatic test of A, B and C single phase direct current resistance data and AB, BC and AC interphase direct current resistance data through program control; a database which comprises a power system basic data and a calculating formula through recording; a CPU capable of intelligently reading test data, taking the power system basic data and the calculating formula, rapidly calculating whether the current transformer accords with a relay protection requirement or not and automatically generating a form through adoption of the experiment data and the conclusion; a display configured to display test data and the form; and a USB port configured to export the form. The current transformer error check test system can effectively change the present situations that the current transformer error check test workload is large and it is easy to make mistake, and greatly mitigate the complicated workload.

Description

technical field [0001] The invention relates to the field of power system control and protection, in particular to a current transformer error checking test system. Background technique [0002] The size of the secondary load impedance of the current transformer has a great influence on the accuracy of the transformer. When the secondary load impedance exceeds the allowable secondary load impedance, the core of the transformer enters a saturated state, and the error of the transformer increases greatly, resulting in a malfunction of the relay protection. [0003] At present, the current transformer error test work is divided into current transformer side characteristic test and load side direct resistance test. The test devices on both sides are independent of each other, and the test data results are simply listed, and it is impossible to draw conclusions about whether the data is qualified or not through effective data calculation and analysis. When checking manually, mo...

AI Technical Summary

Problems solved by technology

There are thousands of pieces of data that need to be checked, the work is complicated and inefficient

[0004] In addition, when performing the load side direct resistance test, the test device can only test single-phase data, and it is necessary to manually plug and unplug the test line repeatedly to complete the three-phase and phase-to-phase direct resistance test

Due to the large number of current transformer winding loads in the entire substation, the task of this test is heavy

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