Transformer Automatic Calibration Device

The primary function of the transformer calibrator is to test the technical performance of voltage and current transformers used in field applications or laboratory settings. To achieve this, the transformer calibrator must be integrated with relevant equipment to form a complete transformer calibration system. Due to the close technical relationship between the performance indicators of the transformer calibrator and the associated equipment, a basic understanding of the transformer calibration system is essential for accurately studying and comprehending the overall concept of the transformer calibrator.

China's transformer testers can be roughly divided into three generations:No Chinese content provided..A Generation of Electrical Testing Instruments,The system is cumbersome to operate, with a complex wiring setup.No content provided for translation..The second-generation verification instrument utilizes more advanced electronic circuits, making it more convenient to use than the previous generation. However, it requires manual switching of range positions during measurement, and displays limited information during testing.No Chinese content provided..The third-generation verification instruments are predominantly equipped with single-chip microcontrollers, enhancing the level of intelligence in the devices. Some of the instruments feature computer communication interfaces, thereby improving office automation.

Here, we primarily introduce...No Chinese content provided..Key Features of the Third-Generation Transformer Calibration Instrument:

⑴.Utilizing a microcontroller for measurement, control, and display functions.

⑵.Equipped with a computer interface, it enhances office automation and reduces manual labor intensity.

⑶.Featuring a large screen display, providing an intuitive user interface, and comprehensive measurement data.

⑷.The system can automatically measure transformer current and voltage loads, and can automatically switch between current and voltage load boxes.

⑸.Equipped with robust error capture measures, it can promptly inform users of error messages.

⑹.Instrument can reach2Most validation instruments on the market currently use resistive-capacitive phase shift..90°The method for measuring data is susceptible to environmental temperature and power frequency. Once these conditions change, the measured data will be significantly affected.

EDHGQA-CTransformer Calibration Instrument employs a unique circuit principleDSPTechnology has addressed the aforementioned issues. The transformer calibrator, from a measurement principle perspective, can be divided into two categories: direct comparison and differential measurement.

Early transformer testers were primarily designed based on the direct comparison principle, involving the direct comparison of the secondary voltage or current of the standard transformer with that of the transformer under test. These values are separately input into the transformer tester, where they are measured through circuits such as resistive voltage dividers, capacitive voltage dividers, and magnetic potential comparators. The resulting difference in voltage or current, after calibration, represents the ratio and phase differences between the transformer under test and the standard transformer.

The advantage of this transformer ratio meter is that the ratio between the standard transformer and the transformer under test does not need to be equal. As long as the rated primary voltage or current of the standard transformer is greater than or equal to the rated value of the transformer under test, a direct calibration can be performed, making it convenient to use.

This transformer tester has the drawback that it cannot calibrate secondary loads less than1VAThe transformer; secondly, the inherent errors of this transformer calibrator are directly added to the errors of the standard transformer, thereby limiting the accuracy class of the tested transformer due to the component errors of the transformer calibrator. For instance, a transformer calibrator's measurement error limit is restricted due to the limitations of its components.±0.05%,Even with the use of higher accuracy standard transformers,Only for verification0.5Lower-level transformers limit the scope of application for direct comparison transformer calibrators.

The Differential Principle Transformer Calibration Meter sends the secondary voltage or current of the standard transformer and the transformer under test into the transformer calibration meter's differential circuit, and then it is re-sent into the measurement circuit, where it is compared with the secondary working voltage or current of the transformer. This comparison provides the ratio and phase differences of the transformer under test from the standard transformer.

Due to the fact that this transformer calibrator is solely used to measure the difference between the standard transformer and the transformer under test, the error of the transformer calibrator is merely the error of the difference between the two transformers being tested. Therefore, its impact on the measurement results is naturally much smaller. Generally speaking, regardless of the level of transformer being tested, as long as the standard transformer meets the specifications, and the error limit of the transformer calibrator does not exceed...±2%This not only makes the transformer calibrator easy to manufacture and reduces costs, but also greatly expands its range of applications.

EDHGQA-CThe Transformer Calibrator is a differential type of calibration instrument.

EDHGQA-CThe Transformer Error Signal Analyzer is a novel automated testing instrument that utilizes advanced electronic technology to directly decompose the error signals of transformers. After appropriate calculations, it simultaneously displays the transformer's percentage error, phase error, and quadrature error in digital form. The instrument is easy to operate, features intuitive readings, and rapid measurements, capable of reducing energy consumption and labor intensity. It is compact, lightweight, convenient for carrying and on-site testing; the instrument can...5%The test was conducted under rated working current (voltage); in addition, it is required that our company also be able to produce and inspect.SLevel Current Transformers and Secondary Voltage100/3VOur voltage transformer calibrator, which is currently capable of...1%Measure the error of current transformers under rated working current; the instrument can easily perform self-calibration at any time during the detection process to ensure precision; key components use imported parts, which are stable and reliable, widely used in departments such as metrology and power supply, and among transformer manufacturers, making it an ideal instrument for transformer testing.

EDHGQA-CTransformer Calibrator, and Accuracy Grade Verification Equipment0.01Level Up10No Chinese content provided., Rated secondary current5A、1ACurrent Transformers and Rated Secondary Voltage of100V、100/V、150V（100/3V、220VOur voltage transformers. Measurement results are displayed directly in digital format.,Please provide the Chinese content to be translated.RSC232Interface,Easily connect with computers.

During the calibration of transformers, the instrument can measure the active and reactive components of the impedance or admittance of the secondary circuit of the transformer under test at any time.

During the calibration of transformers, the instrument automatically indicates the polarity. In case of incorrect polarity, the instrument automatically disconnects the differential current (differential pressure) circuit, ensuring the safety of the instrument's input circuit. An alarm is also triggered to alert the calibrator to take notice.

The equipment can be used as an AC potential meter in a rectangular coordinate system for measuring small AC currents or voltages.

Equipment can be isolatedPTMeasure the secondary voltage drop of voltage transformers along with the operation box.

During the calibration of transformers, instruments can be calibrated using standard current transformers or standard voltage transformers as references, or with dual-stage current transformers, dual-stage voltage transformers, or inductive voltage dividers as proportional standards.

Equipment can be subjected to periodic verification using either the holistic method or the component method.

Welcome to using our equipment. Although it is user-friendly, please take the time to carefully read the manual before operating the instrument.