TOP 5 VOLTAGE DROP solutions to SAVE Your Precious Electrical Loads

30 Dec 2021

Est Reading time: 11 minutes

Ever noticed how the lights in your facility flicker even if your lights are brand new? 

Do your motors need more maintenance and replacement as usual?


It is also the fifth technician you’ve approached when it comes to your equipment, but your equipment was changed a month ago and it’s brand new.


You checked your wiring diagrams and design – strange enough, there is nothing wrong with your wiring. Sounds familiar to you?


If so, you might be experiencing severe voltage drop. Severe voltage drops occur when the voltage at the end of a run of cable is lower than at the beginning.


As any length or size of wires will have resistance, running a current through the direct circuit (dc) resistance will cause the voltage drop. Resistance and reactance will increase as long as the length of the wire increases, therefore voltage drops are an issue in places with long cable runs, such as larger buildings or properties such as farms.


Excessive Voltage drops, if not handled carefully, will lead to low voltage powering your equipment, which results in improper, or no operation to your equipment – causing damage to them. Voltage drops also lead to heat at a high resistance connection, which may cause fires.


While there are many solutions out there to solve your voltage drops, it can be challenging to find one that best suits your equipment loads. If not handled properly, your equipment will suffer, which will cost you a lot of time and money.


If you’re reading this by now, chances are, you are still struggling to decide what kind of solutions to solve your voltage drop issues. But not to worry, we’re here to help.


Get ready to say goodbye to voltage drops as we take you down to the 5 types of solutions you can use for your operational needs – we recommend that you take the time to go through this list before deciding. 

Let’s dive in! 


Voltage Drop Compensator

Known for being used in long electrical cables, voltage drop compensators can be found in golf courses, as well in radio broadcasting and telecommunication applications.

So how do voltage drop compensators overcome voltage drop? With voltage drop compensators installed at the end of the cable where the voltage drop is highest, it will monitor and adjust the voltage to ensure your output voltage supply is constantly maintained at less than 1% of nominal voltage values – compliant with British Regulations for Electrical Installation of no more than 4%.

In other words, you will get to safeguard yourself from trouble if you’re doing your own electrical wiring, should your local authorities audit your project.


You’ll also get to save money on cables as voltage drop compensators allow you to reduce the size and number of power cables required to overcome voltage drop values. Installations with smaller sized power cables also become more convenient and cost-efficient.


Voltage drop compensators are perfect for you if your project consists of long cable runs and you want to save up on changing your cables to compensate for your voltage drop.


Voltage drop compensators come in two types: Single Phase CVC range and Three Phase CVC-3P range.




Variable Transformer

If your operations consist of quality control testing, or to control lamp circuits, operating motors and other electrical equipment of different voltages, then variable transformers are your best bet in getting the job done.


Variable transformers help to control electrical voltage – if the voltage on the AC line is incorrect, a turn of the variable transformer helps to correct the voltage through its sliding brush. By obtaining AC voltage different from the normal 120/240 V in most operations, it helps you to test your devices in different voltages and different motors, as well as other electrical equipment at various voltages.

The result? Fewer burnouts, in other words, you’ll get to prolong and maximize your equipment and motors’ healthy lifespan – enabling you to enjoy the benefits of paying much lesser maintenance fees.


While variable transformers are built with firm positioning of the coil and internal components, it ensures low operating torque so that the output voltage can be adjusted in the range of zero or above line voltage, depending on your operations.



Having a variable transformer in your operations not only helps you to adjust your voltage, but also control your heater or oven temperature so that there’s more uniform heating, and your equipment won’t suffer from burnouts.




Static Uninterrupted Power Supplies (UPS) System

With rising trends such as digitalization and Big Data which have a major impact on the flow of global businesses, there is an increasing need for power protection equipment to help maintain a steady stream of power for business work sites, data centers and healthcare facilities to remain operational.


Millions of dollars can be lost for every hour of process systems downtime, which is why such power protection devices are in place to prevent such power-outage related catastrophes.


If you’re looking for a solution that helps you to save millions of dollars when it comes to your production as well as your operational costs, look no further than placing your investment on Static UPS systems.

Static UPS systems help to create a bridge between utility and generator power to help smooth transition from one power source to another – reducing downtime by providing continuous power to your operations even in outages. While there are several options to choose from, it’s important to note the differences in static UPS systems.


There are two main types of static UPS systems: Offline (line interactive) and online, double conversion static UPS systems.


Image credit: Riello UPS

Offline (line interactive) static UPS system offers the most basic level of power protection. When the main supply is present, the UPS output has a built-in EMI/RFI filter which protects the load from spikes and transients by setting peak voltages to predefined levels.


If the main supply fails or fluctuates outside the UPS’ operating window, a relay will connect the load to inverter output which results in a 4-8 ms transfer time. In normal operations, both the output voltage and frequency will track the input voltage and frequency.


Take note that offline static UPS are only built to protect small, non-critical applications below 1kVA against momentary loss of power. 


Image credits: FS Community

Online UPS systems are the choice for mission-critical applications such as sensitive electronic equipment as they ensure ‘no-break’ switchover in the event of any main supply power failure.


The online UPS system uses a “double-conversion” method (as the name suggests) of accepting AC input, turning it into DC through the rechargeable battery (or battery strings), inverting into 230V to power the electrical equipment.


In an online UPS system, the input AC is charging the battery source which provides power to the output inverter, so that the failure of the input AC won’t activate the transfer switch. In other words, the rectifier will drop out of the circuit and the battery will keep the power steady and constant.


When power is restored, the rectifier will resume carrying the load and charge the batteries, although the charging current is limited to prevent the rectifier from overheating the batteries.

They’re reliable in most electrical operations as they protect the most important equipment every hour, every day. 


Power Line Conditioner

Active Voltage Conditioners, known as Power Line Conditioners, is a device used to protect sensitive loads by smoothing voltage fluctuations such as spikes, transients and electrical noise. The power line conditioners can be electronic or transformer based.


Power line conditioners are also used to overcome voltage sags, maintaining uptime, productivity and protection against damaging electrical disturbances.


If your operation consists of radios, work offices, power tools and air conditioners, the safest option to take would be the power line conditioner.

While intended to increase the quality of electrical power for electrical load equipment, power line conditioners also deliver voltage to the proper level enabling load equipment to function adequately.


While the term “power line conditioner” is often misquoted, you should try to understand the utility supply problems you are experiencing. If your equipment is experiencing less common electrical noise, a “power line conditioner” would be your best bet.


However, if you’re experiencing voltage fluctuations and spikes, the Automatic Voltage Regulator (AVR) will be the appropriate solution for your operations, which we will be covering on the next point.




Automatic Voltage Regulator (AVR)

Voltage drop solution

Automatic Voltage Regulators (AVR), are voltage solutions that help to maintain voltage levels constantly to electrical equipment that require a steady and reliable voltage supply.

If voltage regulation can’t be achieved even by changing the size of the conductor or source, then it’s time for you to get an AVR. AVRs help to regulate voltage variations and anomalies so that your equipment will get a constant and reliable voltage supply. 

Through the diagram of a servo electronic automatic voltage regulator (AVR), we will understand the working mechanism of AVRs. It is noted that the output voltage is also the one that comes from the Buck-Boost Transformer. With the Buck-Boost Transformer, the machine will receive a stable voltage after correction from the Motorised Variable Transformer.

As the servo electronic design AVR receives an unregulated input voltage, the microprocessors in the electric circuits trigger the motor driver – activating the servo motor. The servo motor’s shaft then moves across the windings of the transformer, automatically adjusting the voltage value to the prescribed limit almost instantly. The controlled voltage will be then supplied through the secondary of the Buck-Boost Transformer, and then fed to the machinery or appliances in use.

In a 3-phase supply, the servo motor of the AVR is coupled with 3 autotransformers for the process of voltage correction.

While there’s no one-size-fits-all when it comes to overcoming voltage drops, it is best to identify your operations, as well as electrical diagrams so that you’ll have a better understanding of what voltage solution best suits your needs.

Now you’re equipped with good knowledge of what voltage solutions to overcome your voltage drop problems, you’re set to create a smooth and conducive electrical system.

Stay tuned for our next blog post as we will show you the different types of AVRs that you can use for your operational needs!

Curious to see how National Grid Operators are easily staying ahead of voltage drop with maximum cost efficiency? Find out more in this blog here.


From brownouts to severe voltage fluctuations, Ashley Edison takes care of all your power needs by delivering optimised, stable voltage supply to your electrical system.


Curious to learn more? Get in touch with us. We’ll get back to you with a quote or solution within 24 hours and put all your questions to rest.

ASHLEY Edison International LTD
Scroll to Top
Form Sent!
Thank you for getting in touch with us.

We will be in contact shortly.

Three Phase

SESL-H-3P-S Model
Large Capacity Rating
200 to 2,000 KVA


Enclosure 335
1000W x 1300H x 580D (mm)
250~300 KVA ± 15%
120~200 KVA ± 20%


Enclosure 336
1280W x 1480H x 660D (mm)
400 KVA ± 15%
250 KVA ± 20%


Enclosure 337H
1880W x 1950H x 880D (mm)
500 KVA ± 15%
300 KVA ± 20%


Enclosure 339
1470W x 1950H x 1340D (mm)
600 ~ 1,500 KVA ± 15%
400 ~ 1,000 KVA ± 20%
300 ~ 750 KVA ± 25%
300 ~ 600 KVA ± 30%

Three Phase

SES-H-3P-S Model
Added I/P Breaker Protection
60 to 1,000 KVA


Enclosure 333
490W x 800H x 990D (mm)
≤ 100 KVA ± 15%


Enclosure 334
540W x 900H x 1000D (mm)
120 – 150 KVA ± 15%


Enclosure 335
1000W x 1300H x 580D (mm)
180 – 300 KVA ± 15%
120 – 200 KVA ± 20%
120 – 150 KVA ± 25%


Enclosure 336H
1880W x 1480H x 660D (mm)
400 KVA ± 15%
250 KVA ± 20%
180 ~ 200 KVA ± 25%


Enclosure 337H
1880W x 1950H x 880D (mm)
500 KVA ± 15%
300 KVA ± 20%
250 KVA ± 25%


Enclosure 339H
2170W x 1950H x 1340D (mm)
600~1,000 KVA ± 15%
400~600 KVA ± 20%
300~400 KVA ± 25%

Single Phase

SES-H-S Model
Added I/P Breaker Protection
1 to 100 KVA

Enclosure 102
270W x 460H x 490D (mm)
≤ 20 KVA ± 30%
≤ 15 KVA ± 20%
≤ 10 KVA ± 25%
≤ 10 KVA ± 15%

Enclosure 103
400W x 580H x 500D (mm)
25 KVA ± 15%
20 KVA ± 20%
15 KVA ± 25%

Enclosure 332
380W x 670H x 780D (mm)
30 KVA ± 15%

Enclosure 333
490W x 800H x 990D (mm)
40 ~ 50 KVA ± 15%
25 ~ 30 KVA ± 20%
20 ~ 25 KVA ± 25%
15 ~ 20 KVA ± 30%

Enclosure 334
540W x 900H x 1000D (mm)
60 ~ 75 KVA ± 15%
40 ~60 KVA ± 20%
30 ~ 50 KVA ± 25%
25 ~ 40 KVA ± 30%