Transformer Calibration Tester

Sensor Calibration Meters: Classification

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

China's transformer testers can be roughly divided into three generations:No Chinese content provided..One-Generation Electrical Test InstrumentThe system is cumbersome to operate and the wiring is complex.The.The second-generation verification instrument utilizes more advanced electronic circuits, offering greater convenience than its predecessor. However, it requires manual switching of range positions during the measurement process, and displays limited information during testing.The.The third-generation verifiers mainly utilize single-chip microcontrollers, enhancing the level of intelligence in the instruments. Some of the instruments are equipped with computer communication interfaces, thereby improving the level of office automation.

Here, we mainly introduce...No Chinese content provided..Key Features of the Third-Generation Transformer Calibrator:

⑴ The system utilizes a single-chip microcontroller to achieve measurement, control, and display functions.

Our computer interface enhances office automation and reduces the intensity of manual labor.

Large screen display with user-friendly interface and comprehensive measurement information provided.

④ Automatically performs transformer measurements and can automatically switch current-voltage load boxes.

Our system features robust error capture measures, ensuring timely notification of users regarding any issues.

⑹ The instrument can reach Level 2 accuracy. Currently, most calibration meters on the market use a 90° phase shift method based on resistance and capacitance for data measurement. This method is susceptible to environmental temperature and power frequency fluctuations. Once these conditions change, the measurement data can be significantly affected.

Transformer Calibration Instrument utilizes a unique circuit principle andDSP technology avoids the aforementioned issues.

The transformer testing instrument, from the perspective of its measurement principle, can be divided into two categories: direct comparison and differential measurement.

Early transformer calibrators were primarily designed using a direct comparison principle, which involves sending the secondary voltage or current of the standard transformer and the transformer under test into the transformer calibrator. By using measurement circuits such as resistive voltage dividers, capacitive voltage dividers, and magnetic potential comparators, the difference in voltage or current between the two is measured. After processing, this results in the ratio and phase differences of the transformer under test with respect to the standard transformer.

The advantage of this transformer tester 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 that of the transformer under test, it can be directly calibrated for convenient use.

This transformer tester's drawback is that it cannot calibrate secondary loads less thanVA's transformers; secondly, the inherent errors of this transformer calibrator are directly added to the standard transformer's errors, as the component errors of the transformer calibrator limit the accuracy class of the transformer under test. For instance, a transformer calibrator's measurement error limit is ±0.05% due to its own component restrictions, even if a higher accuracy standard transformer is used, it can only be used to calibrate transformers below 0.5 accuracy class. Therefore, this drawback limits the application scope of the direct comparison transformer calibrator.

The transformer ratio tester based on the differential principle sends the secondary voltage or current of the standard transformer and the transformer under test into the differential circuit of the transformer tester, then the differential section sends it to the measurement section for comparison with the secondary working voltage or current of the transformer, providing 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. 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% is sufficient. This not only makes the transformer calibrator easy to manufacture and reduces costs, but also significantly expands its range of applications. The transformer calibrator is a differential-type calibrator.

The 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 points, phase error, and orthogonal error in digital form. The instrument is easy to operate, with intuitive readings, rapid measurements, and can reduce energy consumption and labor intensity. It is compact, lightweight, easy to carry, and suitable for on-site testing.The test was conducted at a fixed working current (voltage) of 5%; in addition, it is required that our company be able to produce a verification instrument for S-class current transformers and voltage transformers with a secondary voltage of 100/3V, which can measure the error of current transformers at 1% of the rated working current. During the detection process, the instrument can easily perform self-calibration at any time to ensure the accuracy of the instrument; key components use imported components, which are stable and reliable, and are widely used in departments such as metrology and power supply, as well as by transformer manufacturers, making it an ideal instrument for transformer detection.

Transformer Calibrator, and Accuracy Grade Verification Equipment0.01 to 10 levels, rated secondary current of 5A and 1A current transformers, and rated secondary voltage of 100V, 100/V, 150V (100/3V, 220V) voltage transformer. Measurement results are displayed digitally and can be equipped with an RSC232 interface for easy connection to a computer.

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 current transformers, the instrument automatically indicates polarity. In case of incorrect polarity, the instrument automatically breaks the differential (pressure) circuit, ensuring the safety of the instrument's input circuit. It also emits an alarm to alert the calibration personnel.

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

Equipment can be isolatedThe PT and the operating box are measured together to determine the secondary voltage drop of the voltage transformer.

During the calibration of transformers, the instrument can be calibrated using a standard current transformer or a standard voltage transformer as the reference, or with a two-stage current transformer, two-stage voltage transformer, or an inductive voltage divider as the proportional standard.

Equipment can be inspected on a periodic basis using either the whole equipment method or the component method.

Welcome to our company's instruments. Although they are quite easy to operate, please take the time to carefully read through this manual before using the instruments.