Product Details

Variable Frequency Resonance 

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Variable Frequency Resonance English name: Frequency Series Resonan Variable Frequency Resonance consists of an isolation transformer, a frequency and voltage regulating power supply, an excitation transformer, a reactor, and a capacitive voltage divider.The capacitance of the test object and the reactor form a series resonant connection; the voltage divider is connected in parallel with the test object to measure the resonant voltage across it and provide overvoltage protection signals; the frequency-modulated power output is coupled to the series resonant circuit through the excitation transformer to provide the excitation power for variable frequency resonance.

Technical Features

1. One of the few in the country to pass the strict type test appraisal by the national authoritative department - the Electric Power Industry Electrical Equipment Quality Inspection and Testing Center (Wuhan High Voltage Research Institute), ensuring reliable quality and the safety of test personnel, test objects, and test equipment itself;

2. In the 2008 national equipment competition organized by Northeast Electric Power Research Institute, it passed all test items in one go, being the only one to meet all national standard requirements including the 60Min temperature rise, and ranked among the top again;

* Selected by many well-known enterprises (such as Guangxi Electric Power Test and Research Institute, Mudanjiang Electric Power Bureau, China Chemical Thirteenth Construction Group, China Water Conservancy and Hydropower Sixteenth Bureau, Hulunbuir Electric Power Bureau, etc.), with visible use effects and after-sales service.

* Small size, light weight, especially suitable for on-site use;

* Meets national standard requirements: has peak/√2 monitoring function, can monitor test waveforms in real time;

* Overvoltage, overcurrent, discharge, overheating, and zero-start protection are comprehensive and reliable, with an action time of 1 microsecond;

* The equipment comes with a built-in micro printer, which can print and save test data in time;

* Designed with military-standard vibration resistance and dust prevention, able to withstand long-distance transportation and harsh operating environments;

* One-key mouse-style knob "foolproof" operation, with large-screen LCD display;

* Unique software calibration function, convenient for users to calibrate meters, ensuring high voltage value accuracy;

* German Rittal design all-aluminum alloy chassis, can be used upright or horizontal, lightweight and beautiful, greatly facilitating on-site use;

* Keep promises, professional and timely service, do our best to serve customer needs;

* Products are stable and reliable, with a three-year warranty (main unit guaranteed for ten years) and lifetime maintenance;

Attachment: Some common models and typical configuration tables

(Only some common models are listed below)

Configuration Table

Model interpretation: 44/22, capacity 44KVA, voltage 22KV

I. Cable AC Withstand Voltage Test Series

Model	Test items that can be satisfied	Equipment reactor configuration	Remarks
DFVF3000-44/22	10kV (300mm) cable 1KM	22kV Ⅹ1 unit	Portable
DFVF3000-132/66	1. 10kV (300mm) cable 3KM	22kV Ⅹ3 units	Portable
DFVF3000-264/52	1. 10kV (300mm) cable 5KM	22kV Ⅹ6 units	Portable
DFVF3000-1560/66	110kV (300mm) cable 3KM	130kV Ⅹ2 units	Portable

II. Generator Power Frequency Withstand Voltage Test Series

Model	Test items that can be satisfied	Equipment reactor configuration	Remarks
DFVF3000-44/22	1. Generators up to 100MW, phase capacitance 0.1-0.3uF 2. 10kV (300mm) cable 1KM	22kV Ⅹ1 unit	Portable
DFVF3000-100/36	1. Generators up to 600MW, phase capacitance 0.1-0.25uF 2. 10kV (300mm) cable 1.5KM	18kV Ⅹ2 units	Portable
DFVF3000-176/44	1. Generators up to 600MW, phase capacitance 0.1-0.3uF 2. 10kV (300mm) cable 3KM 3. Can also handle generator busbars, main transformers, etc.	22kV Ⅹ4 units	Portable

III. GIS and SF6 Switchgear AC Withstand Voltage Test Series

Model	Test items that can be satisfied	Reactor configuration	Remarks
DFVF3000-250/200	1. AC withstand voltage test for 110kV GIS 2. 35kV (300mm) cable 1KM 3. 10kV (300mm) cable 3KM 4. Power frequency withstand voltage for transformers below 220kV 5. AC withstand voltage for 110kV instrument transformers	40kV Ⅹ5 units	Portable
DFVF3000-100/200	1. AC withstand voltage test for 110kV GIS 2. AC withstand voltage for 110kV instrument transformers	50kV Ⅹ4 units	Portable

IV. Power Frequency AC Withstand Voltage Test Series for Transformers, Motors, and Other Equipment

Model	Test items that can be satisfied	Reactor configuration	Remarks
DFVF3000-105/84	1. Power frequency withstand voltage test for 110kV transformers 2. Power frequency withstand voltage test for 10kV motors 3. AC withstand voltage test for 35kV switchgear 4. 10kV (300mm) cable 1KM	28kV Ⅹ3 units	Portable
DFVF3000-100/80	Same as above	40kV Ⅹ2 units	Portable

(Note: The above only lists some common models, can be customized according to requirements)



Note: The above information and technical parameters are compiled and released by Yangzhou DARUI Electric Co., Ltd.