Voltage Transmitter Quality Identification

voltage transmitter takes signal conversion and isolation transmission as its core principles. By optimizing input range adaptability, output accuracy and anti-interference ability, it achieves high-fidelity conversion and stable transmission of voltage signals. It is widely used in the fields of power monitoring, industrial automation and energy measurement. In high-voltage power grid monitoring, it is used for linear isolation and standardized output of voltage signals; in complex electromagnetic environments, it meets the requirements for signal immunity and long-term stability. Compared with ordinary sensors, voltage transmitters have the characteristics of high accuracy, wide temperature range adaptability, and multiple protections (such as overvoltage and surge protection), and are key components for the safe operation of power systems.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide voltage transmitter quality appraisal services. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for voltage transmitter quality appraisal.

With the advancement of power equipment standardization, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: output accuracy deviation, temperature drift coefficient exceeds the standard;

2, material defects: insufficient copper layer thickness of the PCB board, and the shell protection level does not meet the standard;

3. Process problems: Welding spots are weak and hysteresis loss of magnetic core materials is abnormal;

4. Contract performance disputes: core modules (such as imported isolation chips and high-precision ADCs) are inconsistent with the technical agreement.

voltage transmitter quality identification technical methods mainly include:

1, appearance inspection

Appearance inspection is the first step in identification, mainly checking whether the appearance of the voltage transmitter is damaged, deformed, corroded, etc. For example, observe whether there are cracks in the shell of the transmitter, whether the screws are loose, whether the markings are clear, etc. Appearance damage may affect the internal structure and performance of the product, so it is one of the important aspects of identification.

2, performance test

Performance test is the core content of the identification, mainly testing the measurement accuracy, stability, linearity and other performance indicators of the voltage transmitter. By using professional testing equipment and methods, the actual performance data of the transmitter is obtained, and compared with the technical contract and national standards to determine whether it meets the requirements. For example, use a standard voltage source to input the transmitter, measure its output voltage value, and calculate the measurement error.

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A power company of the applicant signed a "10kV Voltage Transmitter Procurement Contract" with an equipment manufacturer of the respondent, agreeing that the output accuracy is ±0.2%. After being put into production, the measured deviation exceeded ±1.5%. The manufacturer argued that it was caused by on-site electromagnetic interference.

identification analysis results:

The quality analysis expert group conducted relevant data on the "voltage transmitter", contract technical agreement, on-site investigation case materials and other data. After discussion and comprehensive technical analysis, the following quality analysis opinions were made:

The copper layer thickness of the PCB board of the voltage transmitter involved was less than 30% of the agreed value, the isolation chip withstand voltage level was lower than the nominal parameters, and there was a large area of soldering joints.

The appraisal conclusion identified material defects and process control failures as the main causes of loss of precision.

Voltage transmitter quality appraisal report should include:

1, appraisal purpose and reference standards;

2, equipment model involved, technical agreement and operation log;

3, detection method and equipment list;

4, test data and failure correlation analysis;