Ultra-low frequency high voltage dielectric loss testing is a crucial method for evaluating the insulation aging status of power equipment such as high voltage cables, generators, and transformers. Its test results directly determine whether the equipment can be safely put into operation and the maintenance cycle. Currently, similar products on the market generally suffer from issues such as limited functionality, insufficient accuracy, complex operation, and poor portability, making it difficult to meet the efficient and precise detection needs of the power field.

As a professional manufacturer with years of experience in the field of power testing instruments, Baoding Huazheng Electric Manufacturing Co., Ltd. has independently developed the HZVLF series of multi-function ultra-low frequency testers. Leveraging its core advantages of integrated design, multi-parameter synchronous detection, high-precision measurement, and intelligent operation, these testers have become the unanimous choice of power systems, industrial and mining enterprises, third-party quality inspection institutions, and university laboratories across the country.

1. Comprehensive core functions, multi-purpose use, cost reduction and efficiency improvement

The HZVLF series breaks the limitation of traditional equipment being "single-function", integrating multiple core tests into one, significantly reducing equipment procurement costs and on-site carrying burden for enterprises:

Full coverage of basic tests: Equipped with ultra-low frequency AC withstand voltage and DC withstand voltage test functions as standard, it can complete insulation strength testing for 10kV-35kV cables and motors

Professional dielectric loss test: Equipped with built-in T/CEC-243-2019, Q/CSG1205027-2020, and IEEE400.2, three major national/international standard programs, it automatically completes dielectric loss tests for three-phase cables under three voltage points: 0.5U₀, U₀, and 1.5U₀. It automatically calculates the average dielectric loss, change amount, and stability, and directly generates an insulation status evaluation report

Optional expansion functions: Support for partial discharge testing, which allows simultaneous measurement of the dielectric loss value, capacitance, insulation resistance, and partial discharge amount of the test sample during the voltage withstand process, enabling "one connection, multiple tests"

II. Precise measurement technology ensures authentic and reliable data

The instrument adopts industry-leading digital frequency conversion and direct sampling technology on the high-voltage side, eliminating measurement errors inherent in traditional equipment from the root:

Capacitance rise-free effect: Current and voltage data are directly collected from the high-voltage side, coupled with a closed-loop negative feedback control circuit, to completely eliminate voltage measurement deviations caused by capacitance rise

High-precision indicators: voltage and current measurement accuracy both reach 3%, with voltage waveform distortion ≤3%; dielectric loss measurement accuracy of 1%, resolution of 1×10⁻⁵; partial discharge resolution of 1pc, fully meeting the stringent testing standards of the power industry

Intelligent compensation design: To address waveform distortion issues in short cables within 200 meters, it supports the external connection of a dedicated compensation capacitor. The instrument automatically deducts the impact of the compensation capacitor, ensuring accurate measurement results

III. Multiple safety precautions to ensure the safety of test personnel

Safety comes first in high-voltage testing, and the HZVLF series has established a comprehensive intelligent protection system:

Automatic protection calculation: Without the need for manual setting of protection thresholds, the instrument automatically calculates the overvoltage and overcurrent protection values based on the test sample's capacitance and test voltage

Full-scene fault protection: It can achieve millisecond-level shutdown protection against abnormal conditions such as overvoltage, overcurrent, low resistance fault of the test sample, flashover, and sudden changes in voltage and current

Mandatory safety mechanism: Built-in grounding detection function, which prohibits voltage boosting when not reliably grounded; automatically discharges the test sample after the test is completed, avoiding the risk of manual operation

IV. Lightweight and intelligent design, making on-site operations more efficient

In response to the needs of mobile operations on-site in the power industry, the product has undergone deep optimization in terms of structure and operation:

Portability upgrade: For voltages up to and including 60kV, an integrated design is adopted, weighing only 30-35kg; for 80kV/90kV, a split structure of "integrated unit + booster" is used, with each individual piece weighing no more than 40kg after disassembly, allowing for easy handling by one person

Intelligent operation: Equipped with a large-screen color touch screen and a fully graphical Chinese interface, it allows for one-click parameter setting, and the instrument automatically completes the entire process of voltage boosting, pre-test, testing, and discharge

Convenient data management: It can store up to 90 sets of test data in a recyclable manner, supports on-site printing and historical data query, and automatically saves test parameters as the default values for the next time, reducing repetitive operations

V. Full specification coverage to meet the needs of different scenarios

The HZVLF series offers products across all voltage levels from 30kV to 90kV, suitable for most power equipment testing scenarios:

30kV/40kV: Applicable to voltage withstand tests of cables and motors within 10kV, with a load capacity of ≤10µF

50kV/60kV: Applicable to voltage withstand tests of 20kV-25kV cables and motors, with a load capacity of ≤6µF

80kV/90kV: Applicable to 35kV cable and motor voltage withstand tests, featuring a split design that balances load capacity and portability

The entire series supports automatic frequency conversion from 0.1Hz to 0.01Hz, adapting to the testing requirements of samples with different capacities

Manufacturer's strength and after-sales guarantee

Baoding Huazheng Electric boasts over ten years of experience in the research, development, and production of power testing instruments. All our products have passed ISO9001 quality system certification, ensuring their stability and reliability. We offer:

Directly supplied by the original factory, with ample stock available

Whole machine warranty, lifetime technical support

On-site training and debugging services

Special specifications of products can be customized according to customer needs