Static Transfer Switch
Solid state switches that move a critical load between two independent power feeds without an interruption the load can detect.
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Static Frequency Converters And Transfer Switches Built To Order
Nepson Industrial designs and manufactures AC power sources, static transfer switches and shore power conversion systems in Shenzhen since 2006.
Test Power That Simulates Any Grid In The World
HPA programmable AC power sources deliver 0-300 VAC at any frequency from 40 Hz to 499.9 Hz for R&D, production test and QA verification.
Seamless Dual Source Switching For Critical Loads
Three phase static transfer switches from 63 A to 400 A transfer between two independent feeds in 6 ms or less at 98 percent efficiency.
What We Make
Power Conversion And Transfer Equipment Built In Our Own Plant
Static frequency converters, programmable AC power sources, three phase static transfer switches and shore power conversion systems, built in our own Shenzhen plant.
AC Power Sources And Inverters
Programmable AC power sources that reproduce the voltage and frequency of any national grid on your test bench.
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Shore Power Supply
Static frequency converters that let a berthed vessel shut down its diesel generators and run on shore supply.
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Every Product We Build
Full specifications, protection behaviour and dimensions for each model are published on the product pages.
HPA Programmable AC Power Source
The HPA series is a variable frequency AC power source that reproduces the voltage and frequency used in any country on a single bench. It delivers...
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3 Phase Static Transfer Switch
The STS is built with two independent power inlets. The load normally runs from the primary source. If the primary source fails, the secondary source...
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Shore Power Static Frequency Converter
A static frequency converter sized for quayside shore connection, from 1000 kVA to 4000 kVA. It takes the local port supply and delivers a clean IT...
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Industries We Supply
Ports and container terminals, shipyards and vessel owners, data centre and telecom operators, and export manufacturers who must test products on foreign grid voltages and frequencies.
Ports And Container Terminals
Berthed vessels burn fuel in auxiliary engines unless the quay can hand them power at the frequency and voltage their switchboard expects. That is a conversion problem, not a cable problem.
Marine And Shipyards
A yard supplies dozens of vessels that were built for different grids. Conversion equipment on the dock removes the argument about whose frequency is correct.
Data Centres And Telecom Sites
Redundancy only pays off if the changeover is faster than the load notices. A static transfer switch makes the second feed useful instead of decorative.
Electronics Test And Export Compliance
A product sold into three markets has to work on three grids. Bench power that reproduces those grids turns a shipping risk into a test case.
Industrial Plants
Control cabinets and process instruments are cheap compared with the batch they supervise. Keeping them energised through a feed fault is the whole job.
What Problem We Solve
The Supply Adapts To The Load Not The Other Way Round
Equipment fails, trips or has to be certified twice when the supply frequency, voltage or source reliability does not match what the load was designed for. We convert and stabilise the supply instead of forcing the load to compromise.
Wrong Frequency
A 60 Hz machine on a 50 Hz grid runs slow and draws higher magnetising current. Static conversion gives it the supply it was designed for.
Single Point Of Failure
A second feed only counts as redundancy when the transfer is inside the ride through window of the load. Ours is 6 ms or less.
Unrepeatable Test Results
Grid distortion moves production measurements between shifts. An isolated pure sine wave source removes it from the test.
Why Choose Us
Numbers That Decide A Specification
One factory covers R&D, assembly and test. Input and output voltage levels are customised per project, cabinets go out air cooled or in IP65 containers, and every unit is tested before it ships.
2006Founded
6 ms or lessSTS Transfer Time
1000 to 4000 kVAConverter Capacity
40 to 499.9 HzOutput Frequency
Solutions
How A Project Runs From Survey To Commissioning
Shore Power Conversion Projects
From the first berth load survey to a commissioned converter on the quay, every stage has a decision that is expensive to revisit later.
See The ProcessDual Source Power Redundancy
A second feed is only redundancy if the load transfers onto it faster than it can notice. This is what that design looks like end to end.
See The ProcessExport Product Power Testing
Testing a product on the grid you happen to have is how field failures get discovered by the customer. Here is the alternative.
See The ProcessInside The Plant
Assembly Test And Despatch In Shenzhen
Cabinets are fabricated, wired, burned in and tested in house before they are packed.
Quality Checks Before Despatch
- Insulation resistance measured with a 1000 V megohm meter
- Withstand voltage test, 2500 VAC low voltage and 42 kVAC high voltage for one minute
- Protection trip values set and exercised
- Full load run and output waveform verification before dispatch
Knowledge Centre
Guides For Engineers Specifying Power Equipment
What A Static Transfer Switch Does And When You Need One
A static transfer switch moves a load between two independent supplies in milliseconds, fast enough that connected equipment does not restart.
Converting Between 50 Hz And 60 Hz Without Derating The Load
Running a 60 Hz machine on 50 Hz changes motor speed, magnetising current and cooling. Static conversion gives the machine the supply it was designed for.
How To Choose A Programmable AC Power Source For Export Testing
Six questions decide which AC source fits your bench: voltage range, frequency range, waveform, isolation, overload behaviour and metering.
Selecting A Shore Power Static Frequency Converter For A Berth
Capacity, output frequency, system earthing, harmonic limit and housing type are the five decisions that fix the rest of a shore connection project.
FAQ
Questions Buyers Ask
What does Nepson Industrial actually manufacture?
AC power sources and inverters, three phase static transfer switches, and shore power static frequency converters from 1000 kVA to 4000 kVA.
Can the output voltage and frequency be customised?
Yes. Input and output voltage levels are set per project, and converter output can be 50 Hz, 60 Hz or 400 Hz.
Where is the factory?
Longhua District, Shenzhen, China. The company was established in 2006.
How do I get a quotation?
Send the load, voltage, frequency and site conditions by WhatsApp or email and an engineer will size the equipment against them.
Send Us The Load And We Will Size The Equipment
Give us the voltage, frequency, current and site conditions. An engineer will come back with a model number and a drawing, not a brochure.