JSY-03 : Precision Dielectric Loss Measurement for Power Systems

Introduction

The stable operation of high-voltage power equipment is the fundamental guarantee for the safety and reliability of power grids. The dielectric loss factor (tanδ) is a core technical indicator for evaluating the insulation performance of power equipment, which can effectively reflect potential insulation defects such as dampness, aging, and partial discharge inside transformers, bushings, capacitors, lightning arresters and other equipment. However, on-site tanδ testing in power plants and substations is often affected by strong power frequency electromagnetic interference, which seriously reduces the accuracy and stability of measurement results. To solve this industry pain point, the JSY-03 Transformer Tan Delta Tester is developed based on advanced frequency conversion digital measurement technology, providing a high-precision, anti-interference, easy-to-operate professional solution for on-site insulation diagnosis in the power industry.

Core Working Principle

The JSY-03 Tester integrates modern automatic frequency conversion technology, high-precision analog-to-digital conversion technology and intelligent digital calculation algorithms. Its core measurement system adopts the complex number current method, which can realize high-accuracy and fully automatic measurement of capacitance, tanδ and other key parameters of the tested equipment.

To suppress power frequency electromagnetic interference, the instrument is equipped with a high-power switching power supply module, which can output high-stability 45Hz and 55Hz pure sine wave signals, and supports automatic boosting with a maximum output voltage up to 10kV. Through the variable frequency test design, the instrument can effectively eliminate the interference of power frequency signals on the measurement results, ensuring that it can still obtain stable and reliable test data in the environment with strong electromagnetic interference, which is very suitable for on-site testing in complex power field scenarios.

Key Functional Features and Advantages

Superior Anti-Interference and High-Precision Measurement Performance

The JSY-03 Tester has excellent anti-interference capability, with an anti-interference index within 200%, and can maintain reliable measurement data in heavy electromagnetic interference environments. For grounded specimen tests, it adopts IVDDV technology to further improve the stability of data acquisition.

In terms of measurement accuracy, the instrument achieves a capacitance (Cx) measurement accuracy of ±(reading×1%+1pF), and a tanδ measurement accuracy of ±(reading×1%+0.00040). It has a maximum capacitance resolution of 0.001pF (4 valid figures) and a tanδ resolution of 0.001%, with an unlimited tanδ measurement range. It can also automatically identify the type of the tested specimen, including capacitor, inductor and resistor, covering the test requirements of different types of power equipment.

High Integration and Rich Test Functions

With a compact integrated structure, the tester integrates a standard high-voltage capacitor and high-voltage power supply inside, which greatly simplifies the on-site wiring process and reduces the difficulty of on-site operation. It is equipped with a variety of professional test functions:

It can complete the dielectric loss measurement of insulating oil when matched with a dedicated oil cup and test lines;

It has a CVT self-excited test function, which can obtain the capacitance and dielectric loss parameters of C1 and C2 through one-time measurement;

It supports low-voltage shielding function, which can disconnect C11 for 10kV GST test when the 220kV CVT bus is grounded;

It can expand the HV (+10kV) dielectric loss factor test function when matched with external HV transformers or resonance devices.

Intelligent Operation and User-Friendly Design

The whole machine is controlled by a high-performance microprocessor, which realizes fully automatic measurement after the user selects the corresponding measurement mode, with a single measurement duration of about 40s (depending on the selected measurement method). It is equipped with a large-screen LCD display with clear menu prompts, which is easy to read and operate, and reduces the professional threshold for on-site operators. In addition, the instrument is equipped with a standard RS232 computer interface and a WH-A7 mini thermal printer, which is convenient for data storage, transmission and on-site printing of test reports, meeting the needs of standardized test management.

Comprehensive Safety Protection Mechanism

Aiming at the safety risks of high-voltage field tests, the JSY-03 Tester is designed with a multi-level safety protection system, including grounding protection function, over-current protection function, and electric shock protection function. When the operator accidentally gets an electric shock during the test, the instrument can automatically cut off the power supply immediately, which maximizes the safety of the operator and the tested equipment, and effectively avoids safety accidents.

Core Technical Specifications

The main technical indicators of the JSY-03 Transformer Tan Delta Tester are as follows:

High Voltage Output: Internal HV voltage setting range 0.5-10kV, maximum output current 200mA, with continuous smooth regulation; test frequency supports 45, 50, 55, 65Hz single frequency, and 45/55Hz, 55/65Hz, 47.5/52.5Hz automatic dual frequency modes.

Measurement Range: Capacitance range 3pF-60000pF/10kV (internal HV), 3pF-1.5μF/10kV (external HV); test current range 10μA-1A.

Power Supply: 180V-270VAC, 50Hz±1%, compatible with mains supply and generator power supply, adapting to on-site power supply conditions.

Environmental Adaptability: Operating temperature range -10℃ to 50℃, relative humidity <90%, suitable for harsh on-site working conditions.

Mechanical Parameters: Overall dimension 460×360×350mm, weight 28kg, with a portable design for on-site transfer.

Application and Conclusion

The JSY-03 Transformer Tan Delta Tester is widely used in the dielectric loss factor measurement of transformers, bushings, capacitors, lightning arresters and other high-voltage equipment in power systems. Its excellent anti-interference performance, high measurement accuracy, simple operation and comprehensive safety protection make it an ideal core instrument for on-site preventive tests, insulation condition diagnosis and equipment maintenance in power plants, substations and power equipment manufacturing enterprises.

With the continuous development of global power grids towards high voltage, large capacity and high intelligence, the requirements for the insulation performance and operation reliability of power equipment are becoming more and more stringent. The JSY-03 Tester provides an efficient, reliable and safe technical solution for the insulation state evaluation of power equipment, which can help power operation and maintenance personnel to find potential insulation defects in time, avoid equipment failure and large-scale power outage accidents, and provide strong technical support for the safe, stable and high-quality operation of the power system.
     GDZX is a manufacturer of power detection equipment, offering a diverse range of products with comprehensive models and providing professional technical support. Contact us at +86-27-6552607 or +86-17396104357.Website: http://en.gdzxdl.com/