ZGF(S) Intelligent DC Hipot tester

• 1、The fully automatic lightning arrester test and stage test fully display the voltage rise and fall process, as well as the withstand voltage time.

• 2、Grounding detection function: If the instrument is not safely grounded, a grounding reminder will be displayed.

• 3、Automatic voltage withstand test, fully displaying the voltage rise and fall process, as well as the voltage withstand time.

• 4、By adopting AIPWM technology, adjustments have been made to the inaccurate linearity of PWM, resulting in a significant improvement in accuracy. The ripple factor is ≤0.2%.

• 5、The instrument has been enhanced with a perpetual calendar and time function, ensuring that experimental reports include the time and date.

• 6、The pressure doubling cylinder adopts new materials, making it lightweight and sturdy. The bottom is equipped with three built-in pressure doubling cylinders.

• 1、Intelligent Automated Testing: The system features fully automatic voltage withstand test and zinc oxide arrester test functions. During testing, it fully displays the voltage rise and fall process, as well as the withstand voltage time, providing complete transparency of the test procedure.

• 2、Advanced AIPWM Technology: It uses proprietary AIPWM (Artificial Intelligence Pulse Width Modulation) technology, which corrects the non-linear inaccuracies of conventional PWM. This significantly enhances the instrument's overall measurement accuracy and results in an exceptionally low ripple factor of ≤0.2%.

• 3、Enhanced Safety with Grounding Detection: A key safety feature is the built-in grounding detection function. If the instrument is not connected to a safe, reliable ground, it will display a prominent grounding reminder to alert the operator, preventing unsafe operation.

• 4、AI-Based Protection Settings: Replacing traditional analog dials, the instrument uses AI technology to set overvoltage and overcurrent protection values. This allows for precise digital setting of both voltage and current limits, overcoming the limitations of older methods that were prone to drift and could only set voltage.

• 5、Dual Operation Modes: It offers both an intelligent automatic mode for standardized tests and a retained manual mode for experienced operators who require more direct control over the voltage output.

• 6、Data Management and Reporting: The instrument includes a perpetual calendar and time function, ensuring that all test reports automatically include the precise date and time of the test. It can also directly print and save test reports for easy documentation.

• 7、Robust and Portable Construction: The pressure doubling cylinder (voltage multiplier) is constructed from new, lightweight, yet sturdy materials. Its bottom is designed with a three-legged built-in support for stability. Despite its high ratings, the control box weighs only 4.5 kg across all models.

• 1、Superior Accuracy and Low Ripple: The advanced AIPWM technology delivers exceptional measurement accuracy (±1.0% of reading + 1 digit) and a very low ripple factor (≤0.2%), providing more reliable and stable test data.

• 2、Enhanced Intelligence and Automation: The full automation of standard tests (arresters, withstand voltage) simplifies operation, reduces the potential for human error, and improves testing efficiency.

• 3、Improved Safety: The standout feature is the active grounding detection system, which provides a critical safety check before high voltage is applied. The precise, digitally-set overvoltage and overcurrent protection adds another layer of safety.

• 4、User-Friendly Data Management: The ability to print and save reports directly, complete with a time and date stamp, simplifies record-keeping and ensures data traceability.

• 5、Excellent Portability: The low weight of the control box and the improved design of the voltage doubler make the system easy to transport and set up in the field.

• 1、DC Withstand and Leakage Current Testing of Power Cables: It is used for testing various cable types, including oil-paper insulated (PILC) cables and rubber and plastic insulated cables.

• 2、Fully Automatic Testing of Zinc Oxide Lightning Arresters: The instrument's dedicated automatic mode is specifically designed to perform the complete test sequence on zinc oxide arresters, measuring the leakage current at the reference voltage (U1mA) and other parameters.

• 3、Testing of Other High-Voltage Equipment: It is suitable for DC withstand and leakage current tests on transformers, circuit breakers, and generators.

• 4、Substation Maintenance and Commissioning: The instrument is ideal for routine maintenance, fault diagnosis, and commissioning tests on equipment in substations of various voltage levels (10kV up to 400kV).

• 1、What is the main difference between this "Intelligent" (ZGF(S)) model and the standard "ZGF" DC Hipot Tester?
  The key differences are the advanced intelligence and automation features. The ZGF(S) incorporates AIPWM technology for higher accuracy and lower ripple, adds an active grounding detection function for safety, uses AI for precise digital protection settings, and offers fully automatic test modes (especially for arresters). It also includes a perpetual calendar for time-stamped reports and can directly print and save data.
• 2、What is AIPWM technology and what are its benefits?
  AIPWM stands for Artificial Intelligence Pulse Width Modulation. It is an advanced control technology that corrects the non-linear inaccuracies found in traditional PWM circuits. The primary benefits are a significant improvement in overall measurement accuracy (both voltage and current) and a very low ripple factor (≤0.2%) , which results in a purer DC output for more reliable testing.
• 3、How does the grounding detection feature work?
  The instrument has an internal safety check that tests the integrity of the ground connection before the high-voltage output can be activated. If the system detects an unsafe or missing ground, it will stop the test and display a clear "grounding reminder" on the screen, alerting the operator to correct the issue. This prevents operation without a proper ground, which is a critical safety measure.
• 4、What test modes are available?
  The instrument offers two primary modes:
  Intelligent Automatic Mode: Designed for specific test types, it automates the entire process (voltage ramp-up, timing, ramp-down) for standardized tests like zinc oxide arrester testing and general voltage withstand tests.
  Manual Mode: Retained for experienced operators who need to manually adjust the voltage output for non-standard tests or specific diagnostic procedures.
• 5、How does this instrument support data management and reporting?
  The instrument includes a built-in perpetual calendar, so all test records are automatically stamped with the exact date and time. It can directly print test reports via a built-in printer (as indicated by its features) and also save reports internally, simplifying documentation, traceability, and record-keeping.

Enterprise products in strict accordance with international and national standards and rules of industry production, through the national, provincial and municipal electric power research institute and electric power authorities detection, measuring center, fully passed the ISO9001 international quality management system certification, the licence for manufacturing measuring instruments of the People's Republic of China, GB/T19001-2016 quality management system requirements, GB/T24001-2016 environmental management system requirements, GB/T45001-2020 occupational health and safety management system requirements.

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