What Is An NLTC Transformer and How Does It Work?

Understanding NLTC Transformers

NLTC transformers are sometimes referred to as de-energized tap changers (DETC) or sometimes off-circuit tap changers (OCTC). They are mainly used for variation or regulating voltage. 

You can use them if the turn ratio of the transformer is not frequently changed. The transformers enable one to make the voltage levels while the system is detuned.

In single-phase electrical transformers, one transformer is provided with a hand-operated no-load tap changing switching device. This choice lets you tap voltages on the transformer when needed but only when de-energized. 

The switch is suitable for use in applications where the voltage does not need to change frequently; hence, it is ideal for the application of a stable system that doesn't require constant fine-tuning.

Since the changes are inputted manually and when the transformer is off, the system is perfectly safe to accept changes without interfering with operations in progress or putting personnel in hazardous conditions. The simple design ensures that your transformer will function effectively even when environments do not require frequent alterations in voltage.

How Off Load Tap Changer Works?

No-Load Tap Changers, generally speaking, are tap changers that change the voltage of a transformer while it is off. This is how it works:

A switch handle on an NLTC is used to switch in and out of various connections within the transformer, thereby changing the turn ratio. When you turn that handle, you change the position of a metal plate along a row of pins. 

It cuts one connection and makes another so that the percentage of transformer winding turns are still in use gets changed. That will change the output voltage.

An NLTC 3 Phase Pad Mounted Transformer stabilizes all three voltages together, stabilizing power as well. Since NLTCs operate only if the transformer is off, making these changes manually is absolutely harmless.

NLTCs are particularly useful in areas where the changing of voltage is not very often. NLTCs are mostly used in factories and companies that handle power as they do not require changes in their voltage very often.

No Load Tap Changer Operation

A No Load Tap Changer changes the voltage of the transformer. It must be built when the transformer is de-energized or turned off. This is how it operates :

• Manual Control: NLTC uses a manual switch. This switch changes the transformer's turn ratio and adjusts the voltage. In general, the switch is mounted on the exterior of the transformer for accessibility.
• Voltage Regulation: The tap setting of the manual de-energized transformers could increase or decrease to determine the amount of voltage. This should be adjusted so that when energized, the transformer will fit the right amount of voltage without influencing the power supply within.

Since the transformer needs to be turned off to facilitate such changes, NLTCs are useful only for systems in which the voltage need not often be changed.

Core Functionality of NLTC Transformer

The no-load tap changer transformer works on the principle of changing the voltage level of the requirement in a transformer for a given application. Here is how it works:

• Voltage Regulation: NLTC transformers modify transformer winding turn ratio, that is a voltage shifting. This is a on-off type operation performed when the transformer is de-energized.
• Stable Running: The NLTC transformers can vary the voltage so as to make the electrical system stable when there are loads requiring adjustment. This reduces the chances of suffering from power-related issues such as voltage drops.
• Cost Effectiveness: Since NLTC transformers do not need frequent voltage adjustments, they are applicable for systems requiring stable power, for example, in such industrial or utility networks.

The system has no need for continuous adjustments and, therefore ensures reliable voltage control while keeping the cost low.

Structure and Operation

A No Load Tap Changer, or NLTC, is basically a rather simple but very important structure and operation; here is an easy-to-understand breakdown.

• Shape: Major Tank It is the major cylinder that houses the major constituents of NLTC—the core and windings.
• Change-over Device: This device is inserted inside the tank. It serves the function of changing transformer turn ratio. The change above changed the output voltage.
• Operating Hand: This is the hand mounted outside the transformer tank and is manually operated when there exists a voltage adjustment.

2. Operation

• Manual Operation: The NLTC shall be energized only in a transformer-off or de-energized condition. Thus, you shall be able to set in any desired voltage without any danger of system breakdown.
• Turn Ratio Adjustment: The transformer can be adjusted by turning the operating handle. In fact, it sets the output to the required voltage value in the system. NLTC should be used in systems where voltage need not often be switched. It is simple, safe, and effectively maintains stable power.

Importance of NLTC in Power Systems

NLTC plays an extremely vital role in the stability and efficiency of any power system. There are many reasons why NLTCs are important, and all are supported by actual data:

• Voltage Regulation: NLTCs ensure that power system voltage levels are maintained constantly. Often, such voltage variations cause damage or result in some equipment functioning less efficiently. According to the Power Systems Engineering Research Center, the efficiency of some equipment could also fall to as much as 30% due to voltage sags. 
• Increased System Reliability: NLTCs enhance general system reliability in the power supply. Once stable voltage levels are attained, the systems will stress less during outages and malfunctions. 
• Adaptability to Demand Changes: They can be applied to areas with a stable power supply demand. They are helpful, especially in industrial operations or utility companies. They adapt to changing conditions without needing strict checks and sophisticated controls. 
• Lowered Operating Costs: NLTCs lower their operating cost with steady voltages. Steady voltage reduces loss through reduced energy wastage and prolongs the life of electrical apparatus.
• Simplicity and Easy Maintenance: Since NLTCs have fewer moving parts than their on-load counterparts, this feature makes it easy to maintain and operate the device with minimal chances of mechanical failure and its subsequent downtime.
• Safety Assurance: Since NLTC works on a de-energized transformer, it is much safer when the voltage is adjusted. This minimizes the number of electrical accidents during maintenance or operational alteration.

Why Choose NLTC?

• Dependability: NLTCs are so robust and easy so fairly dependable. They are doing their work silently in the background without ever causing any problem.
• Cost-Effective: NLTCs have fewer parts and less operating frequency, so they are a good, cost-effective solution for stable power requirements from the system.
• Simplicity: Post-installation, the NLTCs do not require constant attention and adjustment for their full operation.

Trusted Brands

• Daelim: With its high-performing transformers, Daelim offers high-efficiency and cost-effective NLTC transformers in various industrial applications.
• ABB: Their NLTCs are ruggedly designed and thus expected to serve with low maintenance over more extended periods.
• Siemens: The Siemens NLTCs perform dependently with very minimal maintenance if the proper engineering is met for their durability.

Experience Daelim’s NLTC Transformer

Since electric power has become very crucial for much of the world, an efficient supply system is quite important. That is why the NLTC by Daelim maintains stable voltage even in times of power demand fluctuations.

Equip your Daelim transformers with NLTC for optimized energy use, long equipment life, and reduced costs. Transformer structures are designed to provide constant power so that your systems run smoothly every day.

Seeking a trustworthy transformer solution? Discover Daelim's NLTC Transformer and how it can transform your power system. Contact us today!