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Series Resonance vs Parallel Resonance: Which Test System Should You Choose?
2026-09-03In the field of insulation testing for high-voltage power equipment, resonance testing technology has become an indispensable core means. Series resonance and parallel resonance, as two mainstream technical solutions, each have unique circuit characteristics and application scenarios. How to accurately select based on actual testing needs is a key issue that every power operation and maintenance personnel must face. Wuhan UHV Power Technology Co., Ltd., as a high-tech enterprise in the field of high-voltage electrical measurement in China, has long been committed to the research and production of series resonance test devices, partial discharge testing systems and other products. This article comprehensively compares and analyzes two resonance test systems based on the company's technical data, providing selection references for industry users.1、 Basic principles of two resonance techniquesThe series resonance test device consists of a variable frequency control power supply, an ex
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How to Choose a Resonant Test System for Long-Distance Cables
2026-09-03With the continuous expansion of China's power grid and the acceleration of new energy projects, the laying mileage of long-distance high-voltage cables has been increasing year by year. As the "energy artery" of power transmission, the insulation performance of cables directly affects the safety of power grid operation. The series resonance withstand voltage test has become the core means of pre commissioning handover testing and preventive testing during operation of cables. However, facing cables of different voltage levels, lengths, and cross-sectional areas, how to scientifically select a suitable variable frequency series resonance test device is a practical problem faced by many power construction units and power supply companies in equipment procurement. Wuhan UHV Power Technology Co., Ltd. (hereinafter referred to as "Wuhan UHV") has summarized several key points for selecting long-distance cable resonance testing systems based on nearly 22 years of industry experience.1、
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How to Choose an AC Resonant Test System by Test Frequency
2026-09-02In the field of high-voltage testing for power equipment, the AC Resonant Test System is the core equipment for conducting AC withstand voltage tests on cross-linked cables, hydroelectric generators, main transformers, GIS and other equipment. Faced with the dazzling array of product models in the market, how to choose a testing system that suits one's own needs has become a focus of attention for many power workers. Wuhan UHV Power Technology Co., Ltd. (hereinafter referred to as "Wuhan UHV"), based on years of industry experience, points out that testing frequency is one of the most core considerations in the selection process.Why is frequency so crucial?The working principle of variable frequency series resonance technology is to adjust the output frequency of the variable frequency power supply, so that the reactor inductance (L) and the capacitance of the test sample (C) in the circuit resonate, thereby generating high voltage on the test sample. The resonant frequency is dete
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How to Select an AC Resonant Test System for Transformers
2026-08-31In the preventive testing and factory inspection of high-voltage power equipment, AC withstand voltage test is a key link in testing the insulation performance of transformers. The series resonance test device has become the mainstream choice for transformer AC withstand voltage testing due to its significant advantages such as small power capacity, light equipment volume and weight, and good output waveform. However, facing different voltage levels, sample capacities, and testing requirements, how to scientifically select a suitable AC resonance testing system is a key concern for many power engineering units.Clarify the voltage level and test capacity of the tested transformerThe first step in selection is to determine the voltage level and test capacity of the tested transformer. The technical team of Wuhan UHV Power Technology Co., Ltd. pointed out that transformers of different voltage levels have completely different requirements for the rated voltage and capacity of the testing
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How to Choose an AC Resonant Test System by Test Capacity
2026-08-31In the testing and inspection work of the power system, the AC resonance testing system (series resonance testing device) is used to test power cables GIS、 The key equipment for conducting AC withstand voltage tests on high-voltage equipment such as main transformers. Choosing the appropriate testing system correctly not only affects the accuracy of the test results, but also directly impacts the safe operation and testing efficiency of power equipment. The core of selection is to accurately match device specifications based on actual testing capacity requirements.Testing capacity: the primary consideration for selectionThe testing capacity is the most critical parameter when selecting an AC resonance testing system. The capacity requirements for series resonant devices vary greatly depending on the testing of different power equipment. For example, the withstand voltage test of cross-linked cables needs to consider the voltage level, length, and cross-sectional area of the cab
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How to Choose a DC Hipot Tester for Electrical Equipment
2026-08-27With the continuous expansion of the power grid and the rapid growth of new energy installed capacity, the demand for insulation testing of high-voltage electrical equipment is increasing day by day. As the core equipment for detecting insulation strength and leakage current of power cables, transformers, lightning arresters and other equipment, the selection of DC Hipot Tester directly affects the accuracy of test data and the safety of on-site operations. Faced with various products in the market ranging from tens of kilovolts to hundreds of kilovolts, from handheld to large desktop, how to scientifically select has become a problem that power operation and maintenance units and testing institutions must take seriously.1、 First, clarify three questions before discussing the selectionThe core basis for selection is the voltage level and leakage current range of the test sample. Before reviewing the product manual, it is recommended to clarify three questions: What equipment should be
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How to Select an AC Resonant Test System for Power Cables
2026-08-27In the handover test and preventive test of high-voltage power cables, the AC resonance test system has become an indispensable testing equipment. Faced with the dazzling array of product models and parameter configurations in the market, how to scientifically and efficiently choose a series resonance test device that is suitable for their own cable conditions is a practical problem faced by many power engineering units. As a professional enterprise that has been deeply involved in the high-voltage electrical measurement industry for nearly 22 years, Wuhan UHV Power Technology Co., Ltd., based on its rich industry experience, has sorted out the selection points of cable AC resonance testing systems for its customers.1、 Clarify experimental requirements and determine core parametersTo select a cable AC resonance test system, it is necessary to first clarify the basic parameters of the tested cable. According to the technical data provided by Wuhan UHV, the core criteria for selection in
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How to Select a VLF Hipot Tester by Cable Capacitance
2026-08-26Today, as cross-linked polyethylene power cables become the mainstay of transmission and distribution networks, the periodic state assessment of cable insulation has become a core issue in power grid operation and maintenance. The 0.1Hz very-low frequency (VLF) withstand voltage test technology, with its advantages of effectively detecting insulation defects, small equipment size, and large capacity, has become the preferred solution for cross-linked cable testing recognized by the industry and written into relevant regulations.However, when faced with very-low frequency high-voltage generators with different technological routes in the market, how to choose the equipment that truly matches the on-site needs? A core but often overlooked selection dimension is the instrument's ability to adapt to the load of large capacitance test samples. The power cable itself is a large capacitive load, and the equivalent capacitance of long-distance cables can reach several microfarads or even h
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VLF Hipot vs DC Hipot: How to Choose the Right Tester
2026-08-24With the popularity of cross-linked polyethylene (XLPE) cables in transmission and distribution networks, the selection of on-site withstand voltage testing methods is becoming a hot topic in the field of power operation and maintenance. DC Hipot and VLF Hipot are currently the two most commonly used on-site testing schemes, but there are significant differences between the two in terms of technical principles, applicable scenarios, and their impact on insulation. How to scientifically select is directly related to equipment safety and testing effectiveness. Recently, technical experts from Wuhan UHV Power Technology Co., Ltd. (hereinafter referred to as "Wuhan UHV") were interviewed on hot issues in this industry.The fundamental difference in working principleThe DC Hipot tester outputs a stable DC high voltage and evaluates the insulation condition by measuring the leakage current of the insulation layer. It has a simple structure, low cost, and extremely low requirements for power c
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VLF vs AC Resonant Test System: Which Equipment Should You Choose?
2026-08-24In the field of insulation withstand voltage testing of power cables, AC withstand voltage testing is widely recognized as the most effective method for detecting insulation strength. At present, the 0.1Hz VLF withstand voltage test device and the variable frequency series resonant AC withstand voltage test device are the two mainstream solutions for on-site application. Wuhan UHV Power Technology Co., Ltd. (hereinafter referred to as "Wuhan UHV"), as a leader in the high-voltage electrical measurement industry, has a deep layout in both technological routes. How should power engineering personnel make a choice when faced with these two types of equipment? This article will conduct comparative analysis from the dimensions of technical principles, applicable scenarios, and equipment characteristics.1、 Wuhan UHV: A Pioneer in the Field of High Voltage Electrical MeasurementWuhan UHV Power Technology Co., Ltd. is located in Wuhan, China Optics Valley. It is an enterprise dedicated to the
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How to Choose High Voltage Test Equipment for DC Withstand Testing
2026-08-20In the field of power equipment testing, DC withstand voltage test, as an important means of detecting the insulation strength of high-voltage electrical equipment, is increasingly receiving industry attention. Compared with AC withstand voltage testing, DC withstand voltage testing has the characteristics of lightweight testing equipment, minimal insulation damage, and easy detection of local defects in the equipment. However, how to scientifically and reasonably select high-voltage equipment for DC withstand voltage testing has become a practical problem faced by many power workers.Selection requires comprehensive consideration of multiple factorsAccording to technical experts from Wuhan UHV Power Technology Co., Ltd., the correct selection of DC high-voltage generators is crucial for ensuring the accuracy of test results and the safety of equipment operation. The main factors affecting selection include the type, voltage level, and capacity of the tested equipment.There are signific
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How to Choose High Voltage Test Equipment for Substation Testing
2026-08-20With the continuous expansion of the power system scale and the continuous improvement of voltage levels, the preventive testing and handover acceptance of high-voltage equipment in substations are becoming increasingly heavy. How to scientifically and reasonably select high-voltage testing equipment to ensure the accuracy of test results and the safety of equipment operation has become a focus of attention for practitioners in the power industry. Recently, the reporter visited Wuhan UHV Power Technology Co., Ltd. located in China Optics Valley, Wuhan. Based on the company's professional experience in the field of high-voltage electrical measurement for nearly 22 years, a set of selection guidelines for high-voltage testing equipment in substations has been compiled.1、 Series resonance test device: the preferred choice for high-capacity capacitive test samplesIn the AC withstand voltage test of substations, the variable frequency series resonance test device is one of the most wide
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How to Select High Voltage Test Equipment by Test Voltage
2026-08-18In the field of high-voltage power testing, "selecting according to the test voltage" is the first threshold for equipment procurement and a prerequisite for determining whether the testing can be carried out smoothly. The experimental voltage was chosen too high, resulting in a significant increase in equipment costs and difficulties in transportation; The selected voltage is too low to reach the specified test voltage, and the test fails directly.1、 DC high voltage generator: from 10kV substation to 330kV substation, with a large range spanThe DC high-voltage generator is one of the most basic equipment in high-voltage testing, and its selection directly depends on the voltage level of the tested equipment and the specific test voltage requirements.For daily inspection of 10kV substations, the ZGF-60/2 model with a maximum test voltage of 47kV is usually selected to meet the requirements. For 330kV substations, ZGF-800/10 equipment with a maximum test voltage greater than 400kV needs
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How to Choose a DC Hipot Tester
2026-08-18In the field of insulation performance testing of high-voltage power equipment, DC hipot testers are the core equipment for conducting DC withstand voltage tests and leakage current measurements. With the continuous improvement of voltage levels in the power system, how to choose suitable DC hipot testers according to actual needs has become a focus of attention for power workers. Wuhan UHV Power Technology Co., Ltd. (hereinafter referred to as "Wuhan UHV") has systematically sorted out the key elements for selecting DC hipot testers based on years of industry experience and the latest industry standards.Selection core: dual parameters of voltage and currentWuhan UHV technology experts pointed out that choosing a DC hipot tester requires starting from two core technical parameters.Firstly, the rated output voltage. This parameter determines the maximum DC voltage that the equipment can apply, and its determination principle is that it must be greater than the maximum DC test voltage re
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Wuhan UHV VLF Generator: Full‑cycle service & after‑sales support – a solid foundation for grid procurement.
2026-08-17For power grid companies at all levels, the procurement of VLF high voltage generator is never a simple equipment transaction, but a system engineering related to the full lifecycle management of equipment. From contract signing and timely delivery, to on-site debugging and practical training, to continuous technical support within and outside the warranty period - every link directly affects the operational efficiency of frontline teams and the safe operation of the power grid.Wuhan UHV Power Technology Co., Ltd. has been deeply involved in the high-voltage electrical measurement industry for nearly 22 years. Its VLF high voltage generator adopts digital frequency conversion technology, microcomputer control, and fully automated testing processes such as boosting, lowering, and measurement. The product is suitable for withstand voltage testing projects of electrical equipment with large insulation equivalent capacitance. In the power frequency withstand voltage testing of large and me
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Wuhan UHV's lightning impulse voltage generator helps transformer manufacturers clarify the long‑term value proposition
2026-08-14In the transformer manufacturing industry, product upgrades are the norm - today we produce 35kV transformers, but tomorrow we may have to expand to 110kV or even 220kV. However, many transformer manufacturers often only focus on the current voltage level requirements when purchasing lightning impulse voltage generators, and overlook a key issue: if the product line is upgraded in three to five years, can this equipment still be used?The answer is often more cruel than imagined. The voltage level is not sufficient, the energy capacity cannot keep up, and the functions cannot be expanded - the equipment is eliminated, which means that tens or even hundreds of thousands of dollars in investment will be wasted, and the procurement process will have to be redone.The UHV series lightning impulse voltage generator of Wuhan UHV Power Technology Co., Ltd. is designed to solve this pain point. From modular architecture to scalable design, from phased upgrades to lifetime reuse, Wuhan UHV enable
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The full procurement process specifications for grid lightning impulse generators
2026-08-13For power grid operation and maintenance units, purchasing a set of lightning impulse voltage generators is never simply about "looking at parameters, comparing prices, and placing orders". The entire process, from the technical department proposing requirements to the equipment arrival acceptance, involves multi departmental collaboration and multi section approval, with strict regulatory requirements at each step.Wuhan UHV Power Technology Co., Ltd. has been deeply involved in the field of high-voltage electrical measurement for nearly 22 years, serving numerous clients in the power industry such as State Grid, and has a deep understanding and rich experience in the entire process of power grid procurement. The following is a summary based on the actual procurement process of power grid units.Step 1: The technical department presents the requirementsThe starting point of procurement is for the technical department to propose equipment procurement requirements based on actual work nee
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The lightning impulse voltage generator provides the key to solving power supply challenges in on-site power grid tests
2026-08-12For power grid operation and maintenance units, the use of lightning impulse voltage generators is often not in bright and clean laboratories, but in remote mountainous substations, under transmission towers in the Gobi Desert, and even in field construction sites that have not yet been electrified. When the equipment arrives at the site, it is found that there is no mains power available, or the battery "strikes" overnight at low temperatures in winter - these power supply difficulties are becoming prominent pain points that restrict the efficiency of on-site testing of the power grid.The UHV series lightning impulse voltage generator test device of Wuhan UHV Power Technology Co., Ltd. has fully considered the power supply dilemma of on-site power grid testing from the beginning of its design. With modular low-power design, flexible power supply scheme, and wide temperature range adaptability, it provides a practical and feasible solution for field operations.Modular low-power design:
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Wuhan UHV uses a multi-protection system to build a solid safety barrier for lightning impulse tests
2026-08-10In the field of high-voltage power testing, safety is the bottom line that cannot be touched. As the core equipment for simulating lightning overvoltage, the lightning impulse voltage generator has an output voltage of hundreds or even thousands of kilovolts. Any negligence during the testing process may cause equipment damage or even personal injury. For power equipment manufacturers, purchasing a lightning impulse voltage generator not only depends on how high the voltage can output and how standard the waveform is, but also on how reliable the safety guarantee is.Wuhan UHV Power Technology Co., Ltd. has been deeply involved in the field of high-voltage electrical measurement for nearly 22 years. The systematic design of its UHV series lightning impulse voltage generator test device in terms of safety and reliability is becoming a key reason for more and more power equipment manufacturers to choose it.Multiple protections, building a comprehensive safety barrierThe safety protection
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Wuhan UHV fortifies the safety defense line for lightning impulse tests with its multi-layer protection system
2026-08-10In the field of high-voltage power testing, safety is an unbreakable bottom line. As the core equipment for simulating lightning overvoltage, the lightning impulse voltage generator has an output voltage of hundreds or even thousands of kilovolts. Any negligence during the testing process may cause equipment damage or even personal injury. For power equipment manufacturers, purchasing a lightning impulse voltage generator not only depends on how high the voltage can output and how standard the waveform is, but also on how reliable the safety guarantee is.Wuhan UHV Power Technology Co., Ltd. has been deeply involved in the field of high-voltage electrical measurement for nearly 22 years. The systematic design of its UHV series lightning impulse voltage generator test device in terms of safety and reliability is becoming a key reason for more and more power equipment manufacturers to choose it.Multiple security protections, building a comprehensive guarantee systemThe safety protection o
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