I. Core Technology Principles and Advantages
Modern DC high-voltage generators generally adopt mature intermediate-frequency voltage boosting circuit technology, featuring standardized core working procedures. The equipment first converts the conventional AC power supply into an intermediate-frequency power supply through PWM pulse width modulation technology, then undergoes voltage boosting processing through a high-frequency transformer, and finally converts the AC high voltage into stable and controllable DC high voltage through a voltage doubling rectifier circuit.
This technical solution relies on high-power IGBT devices and a precise voltage closed-loop feedback control system, completely replacing the traditional AC voltage boosting method. With the support of technological upgrades, the equipment has completely solved the problems of traditional equipment being heavy, large in size, and inconvenient to carry, and has outstanding advantages such as small size, light weight, and suitability for on-site operations, better meeting the needs of various outdoor and on-site testing scenarios.
II. Core Key Characteristics of the Equipment
A high-quality DC high-voltage generator must have two core characteristics: high-precision measurement and high safety protection to ensure accurate test data and stable equipment operation:
1. High-precision measurement performance: The measurement accuracy of the equipment’s output voltage and current is better than 1%, and the ripple coefficient is strictly controlled within 0.5%, which can largely avoid test data errors and ensure the authenticity and reliability of various insulation tests and parameter detections.
2. Ultra-fast comprehensive protection function: Equipped with complete overvoltage, overcurrent, zero-position startup, and grounding protection mechanisms, the circuit action accuracy reaches microsecond to nanosecond level. It can quickly respond to sudden conditions such as specimen breakdown and line abnormalities, effectively avoiding equipment damage and test safety risks.
III. Typical Application Scenarios
(1) Power System Test Applications
The power system is the core application field of DC high-voltage generators, mainly used for preventive insulation tests of various power equipment. Specific application scenarios are as follows:
1. Power Cable Test: It can conduct DC withstand voltage tests and leakage current detection on mainstream power cables such as cross-linked polyethylene cables and oil-impregnated paper insulation cables. By applying DC high voltage beyond the equipment’s rated voltage, the dynamic trend of leakage current can be monitored, accurately detecting concealed defects such as cable insulation moisture, aging, and mechanical damage, which is the core detection method for ensuring cable operation safety.
2. Zinc Oxide Surge Arrester Test: This is the most targeted application scenario of the equipment. By accurately detecting the DC reference voltage (U1mA) and the leakage current under 0.75 times U1mA conditions, it can effectively determine whether the non-linear working characteristics of the valve plate of the surge arrester meet the standards, and accurately assess whether the overall protection performance of the equipment complies with grid operation standards.
3. Other High-Voltage Equipment Tests: Widely applicable to transformers, generators, circuit breakers, voltage transformers, etc., it can complete various equipment’s DC withstand voltage tests and leakage current detections, and is an important supporting equipment for regular preventive tests and fault detection of power equipment.
(2) Research and Industrial Field Applications
This equipment can be used as a stable and adjustable high-voltage DC power supply, suitable for multiple industrial production and scientific research scenarios, mainly covering insulation material performance research, power supply for electron microscopes, X-ray equipment support, industrial electrostatic dust removal, laser power supply supply, etc. It has strong versatility and practicality.
IV. Selection Key Points and Principles
Scientific and reasonable selection is the core prerequisite for ensuring test accuracy, equipment operation safety, and extending equipment service life. It needs to be comprehensively considered from voltage level, core technology, function configuration, performance indicators, and production qualifications.
1. Voltage Level Determination: As the core first step of selection, it must strictly follow the higher voltage level of the tested equipment to choose a DC high-voltage generator with a higher rated output voltage. Industry standards have standardized standardized voltage levels, and common specifications include 60kV, 120kV, 200kV, 300kV, 400kV, etc. For scenarios that require testing across multiple voltage levels, the sectionalized structure equipment is preferred. Through the parallel and series combination of voltage boost chambers, one machine can be used for multiple purposes, meeting the requirements of various high and low voltage tests.
2. Core technology assessment: The equipment should prioritize the use of devices equipped with medium-frequency voltage boost circuits and PWM pulse width modulation technology, and employing large-power IGBT components. This type of equipment has a mature technical system, strong voltage output stability, and outstanding volume and weight advantages. It is currently the mainstream and highly reliable technical solution in the industry.
3. Essential function check: For the high-frequency application scenarios of lightning arresters, the equipment must be equipped with a dedicated function key of 0.75U1mA, which can automatically adjust to 0.75 times the reference voltage and accurately read the leakage current. This simplifies the test operation process and improves the detection efficiency. At the same time, the equipment must be equipped with complete automatic protection functions such as overvoltage, overcurrent, zero position startup, and open circuit protection.
4. Key indicators review: During the equipment selection and procurement stage, it is necessary to clearly define the core performance indicators requirements: the output voltage is negative polarity; the voltage and current measurement error is no more than 1.0%; the ripple coefficient is no more than 1%; the equipment should be able to work continuously and stably for at least 30 minutes under rated voltage and rated current conditions.
5. Production qualification assessment: Prioritize choosing products that have passed formal type tests and have enterprise standards higher than industry general standards. At the same time, carefully verify the equipment’s after-sales guarantee system and industry usage reputation to ensure stable equipment quality and reliable subsequent operation.
Five, Test Standards and Procedures System
The design, manufacturing, quality inspection, and on-site use of DC high-voltage generators all need to strictly follow national and industry-specific standards. The core specification system is as follows:
1. Core equipment standard: DL/T 848.1 “General Technical Conditions for High Voltage Test Equipment – Part 1: DC High Voltage Generator” is the core industry-specific standard, clearly stipulating the technical parameters, test methods, inspection rules, identification and packaging requirements of the equipment in all dimensions. The current valid version is DL/T 848.1-2019. Compared with the old version, it has completed comprehensive optimization and upgrading in core technical indicators, safety protection requirements, etc.
2. On-site test guidelines: DL 474.2 “Implementation Guidelines for On-site Insulation Tests – DC High Voltage Tests” provides standardized operation basis for on-site test operations, detailing the wiring methods, charging procedures, data measurement methods, and on-site safety protection measures for practical operations.
3. General basic standards: GB/T 16927.1 “High Voltage Test Technology – Part 1: General Test Requirements” is a basic general standard in the field of high voltage tests, uniformly stipulating the generation methods of high voltage, measurement standards, waveform specifications, etc. as basic requirements for various high voltage tests.
4. Measurement calibration specifications: Localities have already issued local special calibration specifications, including JJG (Yue) 040-2017, JJF (Meng) 5013-2025, etc., which clearly specify the equipment’s measurement characteristics, calibration environmental conditions, calibration items, and test methods, and can be used as important compliance basis for regular equipment calibration, performance evaluation.
Post time: Jun-30-2026