Wuhan Longdian Electrical Equipment Co., Ltd ，established in 2007 ，located in the Donghu Hight and New Technology Development Zone，Wuhan city，Hubei Province，China.
Longdian Electric is a collection of R&D, production, sales in the integration of power testing equipment manufacturers and service providers.
Longdian Electric mainly enter into business and keep a long-term relationship with following companies or sectors ：power generation, power supply, power consumption departments, water conservancy, petroleum, railway, mining, chemical, scientific research institutions and other production enterprises of the power system.
The main products including: HV Switch Tester, Relay Protection Tester, Transformer Tester, Circuit Resistance Tester and other high-voltage test equipment and testing Instrumentation. And we also according to the customers‘ needs to provide suitable and professional solutions of power testing equipment.
Longdian Electric fully following the modern management system and strictly implementing the ISO9001 quality system certifications. So Longdian obtains a successively new technology patents:
"High Voltage Switching Characteristic Tester", "Relay Protection Tester", "Mutual Inductor Tester", "Transformer Tester", "Withstand Voltage Tester", "Battery Tester", "Cable Failure Tester" , "High Current Generarator", which make the product quality management and production process are effectively controlled, and the high quality and reliability of the products and excellent after-sales service are guaranteed.
After years of development, Longdian Electric has always adhered to the corporate tenet of "Quality First, Honesty First, Customer First", focusing on reputation and efficiency, and striving to meet the new needs and requirements of customers. It has become a well-known manufacturer and supplier of domestic power test equipment.
At the same time, Longdian Electric responded to the “One Belt, One Road Initiative” for helping Longdian Electric to consolidate the traditional markets and key markets and to open up new markets. And our products have been successfully exported and got good feedbacks in following countries and regions :the United Kingdom, the Netherlands, Chile, Indonesia, Japan, Argentina, Australia, Russia, Vietnam, South Korea, etc. Presenting a good situation of domestic and international companies advancing together.
Therefore, Longdian Electric sincerely welcomes all-round cooperation with colleagues from all social circles , and work together to create a better future.
Welcome to TradeChina
0.1Hz Ultra-Low Frequency 30KV 40KV 50KV 60KV 70KV 80KV High Voltage Generator
FOB Reference Price
Purchase quantity ()
Minimum order quantity
Payment
Meorient Import & Export Co.LTD
China - Hangzhou
Trading Company
Trade Capacity
Export Percentage
Nearest Port
Hangzhou,Shanghai
Accepted Delivery Terms
Employees
5-10人
Accepted Payment Currency
USD,CNY
Average Lead Time
45 Day(s)
Certifications
Product Specifications
--Product Description
Product Description
Ultra-Low Frequency Products and Selection of It
0.1Hz -30KV 40KV 50KV 60KV 70KV 80KV Ultra-Low Frequency High Voltage Generator
Model | Rated Voltages | Load capacity | Fuse | Weight | Useful |
LD-0.1HZ | 30KV 40KV 50KV 60KV 70KV 80KV(peak) | 0.1Hz,≤1.1µF | 20A | Control ：6㎏ Body Boost ：50㎏ | Used for cable and generator with corresponding voltage |
0.05Hz,≤2.2µF | |||||
0.02Hz,≤5.5µF | |||||
0.01Hz,≤11.0µF |
How to choose the suitable products for test
Please make sure that the capacitance of test products is below the instrument rated capacitance. The waveform will be influence if the capacitance of test products is too small and the instrument can not normally output when it below 0.05µF. 0.05µF capacitor in parallel to auxiliary output. Below is capacitance of some instrument for your reference.
Single relatively power capacity of different Generator
Thermal Power | Hydropower | |||||||||||
Generator capacitance （MW） | 200 | 300 | 600 | 85 | 125—150 | 300 | 400 | |||||
Single relatively power capacity（µF） | 0.2-0.25 | 0.18-0.26 | 0.31-0.34 | 0.69 | 1.8-1.9 | 1.7-2.5 | 2.0-2.5 | |||||
Power capacitance of single-core XLPE insulated cable (µF/km)
Capacity µF/Km | |||||||||||
Voltage (kV) | 10 | 0.15 | 0.17 | 0.18 | 0.19 | 0.21 | |||||
35 | — | — | — | 0.11 | 0.12 | ||||||
Cross-sectional area （mm²） | 16 | 25 | 35 | 50 | 70 | ||||||
Capacity µF/Km | |||||||||||||
Voltage (kV) | 10 | 0.24 | 0.26 | 0.28 | 0.32 | 0.38 | — | ||||||
35 | 0.13 | 0.14 | 0.15 | 0.16 | 0.17 | 0.18 | |||||||
Cross-sectional area （mm²） | 95 | 120 | 150 | 185 | 240 | 270 | |||||||
Products test current estimation method
Formula ：Ｉ＝２π fＣＵ
Theory of Ultra-Low Frequency Dielectric Strength Test
Ultra-Low Frequency Dielectric Strength Test is the alternative way for power frequency voltage withstand test. as we know , it is needed huge capacity testing transformer or a resonant transformer for power frequency voltage withstand test to large generator ,cables etc due to larger electrical capacity of insulating layer . The huge equipment not only bulky but also expensive and not suitable for use. The electricity sector makes some test to solve the problems. according to theory and test result from domestic and overseas , 0.1Hz ultra-low frequency voltage withstand test can solve this problems and the advantage is not only got same test results but also the instrument dimensions is small and considerably reduced the weight of it . The capacity of it is 1/500 of tradition way. Greatly simplify testing procedures, That is why commonly used in the developed countries, china ‘s ministry of electric power entrust Wuhan high voltage research institute to drafting “ 35Kv and below XLPE insulated power cable ultra-low frequency (0.1Hz) voltage withstand test methods ‘for promoting this approach. The instrument is developed according to China's made of this need. It can be widely used in cable, large-scale high-pressure rotary motor, power capacitors into AC voltage withstand test.
Company Profile
Wuhan Longdian Electrical equipment Co., Ltd.
Certifications
Product packaging
No desirable products?
Sourcing assistant>
How to start your business
- Step 1Find your interested products by search keywords
- Step 2Contact the supplier by clicking ”Enquire” or “request meeting” button, otherwise, you also could consult our import consultant.
- Step 3After verifying your email, get response from suppliers or our trade manager will contact you as soon as possible
- Step 4Set up meeting with the Chinese supplier without language barrier