--- description: Buy a reliable Variable-Frequency Resonance Voltage Withstand Device from a trusted China factory. Perfect for testing and industrial applications. title: Variable-frequency Resonance Voltage Withstand Device - DEMIKS image: https://demikspower.com/wp-content/uploads/2025/05/1-100.png --- [Skip to content](#content) ## Top VFSR Variable-frequency Resonance Voltage Withstand Device Manufacturer in China # Variable-frequency Resonance Voltage Withstand Device If you’re searching for the best variable frequency resonance voltage withstand devices (VFSR) in China, look no further than DEMIKS. As an industry-leading manufacturer and supplier, we guarantee reliable, high-quality products and services tailored to your requirements. Our variable frequency resonance voltage withstand devices are unmatched for precision and safety during your operations. Rely on DEMIKS for all your testing equipment. ![Variable-frequency power source](https://demikspower.com/wp-content/uploads/2025/05/1-104.png) ## VFSR Variable-frequency power source DBP-DL-6kVA * Operation is managed through a built-in touch screen which enhances control and boosts effectiveness. Sufficient permitting of safeguards permits automated testing along with test program creation. The entire process is harmless, stable, and failsafe. * Autonomously tracks the fluctuation of the system to manage the voltage during the full range of output (20—300Hz). Meanwhile protecting from under/over-voltage, over current, flash-over, and power loss safeguarding constructs, the entire operation remains efficient. * Permits enhanced tracking for mic monitoring with current/voltage supply alongside high voltage output frequency. These parameters, along with many others, are displayed on a clear LCD screen enhancing user experience. Tracking further aids in control, thus all data is automatically saved. * Sufficient transportation, paired with protective housing from over-voltage, over-current, flash-over aids in providing long term internal structural robustness. | Item | Value | | --------------------------------------------------------------------------------------------------- | ------------------------------------- | | Rated output capacity | 6kW | | Working Power supply | 220V/380V | | Output Voltage | 0 \~400V | | Output waveform | sine wave | | Voltage resolution | 0.01kV | | Voltage Measuring Accuracy | 0.50% | | Frequency Adjusted Range | 30 \~300Hz | | Frequency Adjusted Resolution | ≤0.1Hz | | Frequency Stability | 0.10% | | Running time | continuous 60min under rated capacity | | The maximum temperature of components running continuously for 60min under the rated capacity≤ 65k; | | ## Variable-frequency Series Resonance power source DBP-DL-15kVA * **Easy Operation**: There is an embedded touch screen for selection which with menus simplifies the operation, gives a human-machine interaction design ergonomics, and an intuitive interface. * **Higher Order Testing Functions**: There are automatic frequency scanning (20-300Hz), resonance tracking, customizable test programs, and automatic data saving with query functions enabled. * **Complete Safety Protections Available**: Covers over-voltage, over-current, flash-over, and power-off protections providing additional safeties for the users, the equipment and the components. * **Dependable Performance**: Ensures the operation is stable, safe, and becomes durable with the simulation testing done, a robust structure internally, and the clear LCD display showing parameters real time ![DBP-DL-15kVA](https://demikspower.com/wp-content/uploads/2025/05/1-105.png) [ DXC-101 Transformer Control Box - 1 ](https://demikspower.com/wp-content/uploads/2025/05/2-74.jpg) [ DXC-101 Transformer Control Box - 2 ](https://demikspower.com/wp-content/uploads/2025/05/3-65.jpg) [ DXC-101 Transformer Control Box - 3 ](https://demikspower.com/wp-content/uploads/2025/05/4-74.jpg) [ DXC-101 Transformer Control Box - 4 ](https://demikspower.com/wp-content/uploads/2025/05/5-60.jpg) [ DXC-101 Transformer Control Box - 5 ](https://demikspower.com/wp-content/uploads/2025/05/9-9.jpg) [ DXC-101 Transformer Control Box - 6 ](https://demikspower.com/wp-content/uploads/2025/05/10-6.jpg) | Item | Value | | --------------------------------------------------------------------------------------------------- | ------------------------------------- | | Rated output capacity | 15kW | | Working Power supply | 220V/380V | | Output Voltage | 0 \~400V | | Output waveform | sine wave | | Voltage resolution | 0.01kV | | Voltage Measuring Accuracy | 0.50% | | Frequency Adjusted Range | 30 \~300Hz | | Frequency Adjusted Resolution | ≤0.1Hz | | Frequency Stability | 0.10% | | Running time | continuous 60min under rated capacity | | The maximum temperature of components running continuously for 60min under the rated capacity≤ 65k; | | ![DBP-DL-270kVA/270kV/45kV](https://demikspower.com/wp-content/uploads/2025/05/1-106.png) ## DBP-DL-270kVA/270kV/45kV VFSR AC Resonant System * **Product Purpose**: The DBP-DL series device performs voltage withstand testing on primary electrical apparatuses which includes transformers and GIS systems, SF6 switches, CT/PT devices, insulators, cables, and within the voltage levels of 220 kV and below. * **Core Technology**: Series resonance technology and a variable frequency power supply control box, excitation transformer, reactor, capacitor divider, and compensation capacitor are some of the core technologies used. * **Key Features**: Innovations in the electrical insulation and mechanical strength features of the variable frequency power control box provided improved functionality for its stable output and more flexible modes of operation. * **Versatility**: Each control box is equipped with a single-phase 220V three-phase 380V input making them versatile with multi-purpose functionality. [ DBP-DL-270kVA/270kV/45kV -1 ](https://demikspower.com/wp-content/uploads/2025/05/1-97.jpg) [ DBP-DL-270kVA/270kV/45kV -2 ](https://demikspower.com/wp-content/uploads/2025/05/2-99.jpg) [ DBP-DL-270kVA/270kV/45kV -3 ](https://demikspower.com/wp-content/uploads/2025/05/3-101.jpg) [ DBP-DL-270kVA/270kV/45kV -4 ](https://demikspower.com/wp-content/uploads/2025/05/4-94.jpg) | Technical Description | Parameter(Value) | | ------------------------ | ------------------------------------------------------------------------------------------------------- | | Rated Capacity | 270kVA | | Input Power Supply | 220/380V 50/60Hz | | Rated Voltage | 45kV;90kV; 135KV; 270KV | | Rated Current | 6A;3A; 2A;1A | | Working Frequency | 0\~300Hz | | Waveform Distortion Rate | output voltage waveform distortion rate≤1% | | Working Time | continuous operation 60min is allowed under rated load; Over-voltage 1.1 times for 3 minutes | | Temperature Rise | The temperature rise ≤65k after continuous operation under rated load for 60min; | | Quality Factor | Device itself Q≥30(f=45Hz) | | Protection Function | Over-current,over-voltage and flash-over protection (see frequency conversion power supply for details) | | Measurement accuracy | Effective value of the system is at level 1.5 | ## Variable-frequency AC Resonant test system DBP-DL-108kVA/108kV/27kV * **Product Purpose**: With regard to the voltage withstand tests for primary electrical equipment in 220kV and below substations, the DBP-DL series device serves the primary voltage supervising transformers, GIS systems, SF6 switches, CT/PT, insulators, cables and others. * **Core Technology**: Series resonance methods are applied with the following components: variable frequency power supply control box, excitation transformer, reactor, capacitor divider and compensation capacitor. * **Key Features**: High strength to weight ratio fusible reactors and strength and electrical isolation to weight ratio power control boxes. * **Versatility**: Allows for single-phase 220V and three-phase 380V inputs, provides numerous configurations tailored to different test needs, as well as high versatility and functionality at a lower cost ![Variable-frequency power source DBP-DL-108kVA/108kV/27kV](https://demikspower.com/wp-content/uploads/2025/05/1-107.png) [ Variable-frequency power source DBP-DL-108kVA/108kV/27kV -1 ](https://demikspower.com/wp-content/uploads/2025/05/1-98.jpg) [ Variable-frequency power source DBP-DL-108kVA/108kV/27kV -2 ](https://demikspower.com/wp-content/uploads/2025/05/2-100.jpg) [ Variable-frequency power source DBP-DL-108kVA/108kV/27kV -3 ](https://demikspower.com/wp-content/uploads/2025/05/3-102.jpg) [ Variable-frequency power source DBP-DL-108kVA/108kV/27kV -4 ](https://demikspower.com/wp-content/uploads/2025/05/5-78.jpg) | Technical Description | Parameter(Value) | | ------------------------ | ------------------------------------------------------------------------------------------------------- | | Rated Capacity | 108kVA | | Input Power Supply | 220/380V 30/60Hz | | Rated Voltage | 45kV;90kV; 135KV; 270KV | | Rated Current | 6A;3A; 2A;1A | | Working Frequency | 0\~300Hz | | Waveform Distortion Rate | output voltage waveform distortion rate≤1% | | Working Time | continuous operation 60min is allowed under rated load; Over-voltage 1.1 times for 3 minutes | | Temperature Rise | The temperature rise ≤65k after continuous operation under rated load for 60min; | | Quality Factor | Device itself Q≥30(f=45Hz) | | Protection Function | Over-current,over-voltage and flash-over protection (see frequency conversion power supply for details) | | Measurement accuracy | Effective value of the system is at level 1.5 | ![DBP-DL-216kVA/108kV/27kV](https://demikspower.com/wp-content/uploads/2025/05/1-108.png) ## DBP-DL-216kVA/108kV/27kV VFSR AC series Resonance system * **Purpose & Application**: The DBP-DL series is used for voltage withstand testing of primary electrical equipment in substations (up to 220kV) such as transformers, GIS systems, SF6 switches, CT/PT, insulators, and cables. * **Technology & Components**: Employs series resonance technology, power supply control box for variable frequency, excitation transformer, reactor, capacitor divider, and compensation capacitor. * **Key Features**: Lightweight and compact design of the reactor with high mechanical strength and insulation; versatile and robust controllable non-sparking variable frequency power supply equipped with reliable protection, high output stability, and multi-function mode multi-channel flexible operation. * **Versatility & Efficiency**: Accepts single-phase 220V or three-phase 380V as input, gives appropriate flexible arrangements for multiple test items, and maintains low cost and multifunctional efficiency [ DBP-DL-216kVA/108kV/27kV -1 ](https://demikspower.com/wp-content/uploads/2025/05/1-99.jpg) [ DBP-DL-216kVA/108kV/27kV -2 ](https://demikspower.com/wp-content/uploads/2025/05/2-101.jpg) [ DBP-DL-216kVA/108kV/27kV -3 ](https://demikspower.com/wp-content/uploads/2025/05/3-103.jpg) [ DBP-DL-216kVA/108kV/27kV -4 ](https://demikspower.com/wp-content/uploads/2025/05/4-95.jpg) | Technical Description | Parameter(Value) | | ------------------------ | ------------------------------------------------------------------------------------------------------- | | Rated Capacity | 216kVA | | Input Power Supply | 220/380V 30/60Hz | | Rated Voltage | 45kV;90kV; 135KV; 270KV | | Rated Current | 6A;3A; 2A;1A | | Working Frequency | 0\~300Hz | | Waveform Distortion Rate | output voltage waveform distortion rate≤1% | | Working Time | continuous operation 60min is allowed under rated load; Over-voltage 1.1 times for 3 minutes | | Temperature Rise | The temperature rise ≤65k after continuous operation under rated load for 60min; | | Quality Factor | Device itself Q≥30(f=45Hz) | | Protection Function | Over-current,over-voltage and flash-over protection (see frequency conversion power supply for details) | | Measurement accuracy | Effective value of the system is at level 1.5 | ## VFSR Variable-frequency Series Resonant System DBP-DL-540kVA/270kV/27kV * **Product Purpose**: The scope of the DBP-DL series device covers voltage withstand tests for primary electrical equipment in substations (220kV and below) like transformers, GIS, SF6 switches, CT/PT devices, insulators, as well as cables. * **Key Features**: Comprising a variable frequency power supply control box, excitation transformer, reactor, capacitor divider, and compensation capacitor, the equipment utilizes the series resonance principle. * **Advantages**: Offers elevated tangible value with regard to compactness and weight of the reactor, high mechanical strength, exceptional electrical insulation, and versatile operational modes with strong power control box output. * **Power Flexibility**: Cost-effective three-phase 380V multi-purpose enhancement for on-site work. ![Variable-frequency power source DBP-DL-540kVA/270kV/27kV](https://demikspower.com/wp-content/uploads/2025/05/1-109.png) [ Variable-frequency power source DBP-DL-540kVA/270kV/27kV -1 ](https://demikspower.com/wp-content/uploads/2025/05/2-102.jpg) [ Variable-frequency power source DBP-DL-540kVA/270kV/27kV -2 ](https://demikspower.com/wp-content/uploads/2025/05/3-104.jpg) [ Variable-frequency power source DBP-DL-540kVA/270kV/27kV -3 ](https://demikspower.com/wp-content/uploads/2025/05/4-96.jpg) [ Variable-frequency power source DBP-DL-540kVA/270kV/27kV - 4 ](https://demikspower.com/wp-content/uploads/2025/05/6-55.jpg) | Technical Description | Parameter(Value) | | ------------------------ | ------------------------------------------------------------------------------------------------------- | | Rated Capacity | 270kVA | | Input Power Supply | 220/380V 50/60Hz | | Rated Voltage | 45kV;90kV; 135KV; 270KV | | Rated Current | 6A;3A; 2A;1A | | Working Frequency | 0\~300Hz | | Waveform Distortion Rate | output voltage waveform distortion rate≤1% | | Working Time | continuous operation 60min is allowed under rated load; Over-voltage 1.1 times for 3 minutes | | Temperature Rise | The temperature rise ≤65k after continuous operation under rated load for 60min; | | Quality Factor | Device itself Q≥30(f=45Hz) | | Protection Function | Over-current,over-voltage and flash-over protection (see frequency conversion power supply for details) | | Measurement accuracy | Effective value of the system is at level 1.5 | ## Understanding the Variable Frequency aC resonant test Drive: A Comprehensive Guide Reconfigurable Electric Drives (VFDs) are an industrial and commercial necessity for the meticulous management of electric motors because of their economical use of energy and flexibility. It enhances process efficiency whilst minimizing equipment wear and tear and reducing overall energy consumption. ![995f9ce8 line4 1](https://demikspower.com/wp-content/uploads/2025/05/995f9ce8-line4-1.png) [ enquiry now ](#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6IjI1MyIsInRvZ2dsZSI6ZmFsc2V9) [ More details ](https://demikspower.com/blog/what-is-vfd/) Featured Blog Topics ## Insights, Tips & Trends [ View All Blog ](https://demikspower.com/blog/) [ ![Partial Discharge Testing Equipment](https://demikspower.com/wp-content/uploads/2025/07/3-3.png) ](https://demikspower.com/blog/a-customer-from-wuhan-ordered-a-set-of-demiks-power-digital-withstand-voltage-partial-discharge-test-system/) [ A customer from Wuhan ordered a set of DEMIKS Power digital withstand voltage partial discharge test system ](https://demikspower.com/blog/a-customer-from-wuhan-ordered-a-set-of-demiks-power-digital-withstand-voltage-partial-discharge-test-system/) July 2, 2026 A customer from Wuhan, Hubei, ordered a set of DEMIKS Power digital withstand voltage partial discharge test [ Read More ](https://demikspower.com/blog/a-customer-from-wuhan-ordered-a-set-of-demiks-power-digital-withstand-voltage-partial-discharge-test-system/) [ ![3 1](https://demikspower.com/wp-content/uploads/2026/06/3-1.jpg) ](https://demikspower.com/blog/distribution-and-development-of-chinese-manufacturers-of-power-frequency-withstand-voltage-equipment/) [ Distribution and Development of Chinese Manufacturers of Power-Frequency Withstand Voltage Equipment ](https://demikspower.com/blog/distribution-and-development-of-chinese-manufacturers-of-power-frequency-withstand-voltage-equipment/) July 1, 2026 CONTENTS What is an IEC standard power frequency voltage withstanding test? What is the difference between an [ Read More ](https://demikspower.com/blog/distribution-and-development-of-chinese-manufacturers-of-power-frequency-withstand-voltage-equipment/) [ ![Grading Ring](https://demikspower.com/wp-content/uploads/2026/06/Grading-Ring.jpg) ](https://demikspower.com/blog/the-difference-between-the-grading-ring-and-the-grading-ball-in-the-high-voltage-bushing-and-their-respective-functions/) [ The difference between the grading ring and the grading ball in the high-voltage bushing and their respective functions ](https://demikspower.com/blog/the-difference-between-the-grading-ring-and-the-grading-ball-in-the-high-voltage-bushing-and-their-respective-functions/) June 30, 2026 As a key equipment in the AC transmission and transformation system of the power industry, the [ Read More ](https://demikspower.com/blog/the-difference-between-the-grading-ring-and-the-grading-ball-in-the-high-voltage-bushing-and-their-respective-functions/) × ###### Contents Contents Scroll to Top WhatsApp us Get in touch with DEMIKS company Contact Form 在用 Your Name \* Email Phone/WhatsApp Your Message Submit Form ```json {"@context":"https://schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https://demikspower.com/high-voltage-test-equipment/ac-resonant-test-system/#breadcrumb","itemListElement":[{"@type":"ListItem","position":"1","item":{"@id":"https://demikspower.com","name":"Home"}},{"@type":"ListItem","position":"2","item":{"@id":"https://demikspower.com/high-voltage-test-equipment/","name":"High Voltage Test Equipment"}},{"@type":"ListItem","position":"3","item":{"@id":"https://demikspower.com/high-voltage-test-equipment/variable-frequency-resonance-voltage-withstand-device/","name":"Variable-frequency Resonance Voltage Withstand Device"}}]}]} ```