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NALVA TRANSMISSION INDUSTRIES

Leading Manufacturer of Corona Rings

About NALVA TRANSMISSION INDUSTRIES

Protecting Power Transmission line with High End Quality Corona Rings

Welcome to NALVA TRANSMISSION INDUSTRIES, a leading manufacturer of corona rings for the power transmission industry. Our products ensure reliable and efficient transmission of electricity while minimizing corona discharge. We deal with high power transmission lines. We manufacture corona/grading rings for 220kv, 400kv, 765kv transmission and 500kv & 800kv DC lines. And also, for substation, lightening arresters. We are best in our field of fabrication & surface treatment for the rings which need to smooth & plays the major role to protect insulator from getting damaged. Our ring assures to extend the life of the insulator by maintaining the quality to submerge the corona discharge problem. Aluminum is the most common metal used in the manufacturing of corona/grading ring.

We are approved by PGCIL

What is a corona ring

Corona ring is a Crucial Component in High-Voltage Systems. Corona rings are electrical components designed to reduce corona discharge by smoothing the electric field around high-voltage systems/Power lines. They are typically installed on high-voltage transmission lines, substations, and insulators. The primary function of corona rings is to reduce the electric field strength around high-voltage systems/Power lines, making it less likely for corona discharge to occur.

A corona ring, is a toroid of conductive material, usually metal, which is attached to a terminal or other hardware piece of high voltage equipment. The purpose of the corona ring is to distribute the electric field gradient and lower its maximum values below the corona threshold, preventing corona discharge. Corona rings are used on very high voltage power transmission insulators and switchgear, and on scientific research apparatus that generates high voltages. A very similar related device, the grading ring, is used around insulators.

Corona rings prolong the lifetime of insulator surfaces by suppressing the effects of corona discharge.

Applications of Corona Rings

Insulators

Corona rings are used to reduce corona discharge on insulators.

Substations

Corona rings are used to reduce corona discharge in substations.

High-Voltage Direct Current (HVDC) Systems

Corona rings are used to reduce corona discharge in HVDC systems.

ALUMINIUM ALLOY

Aluminium alloy is a popular material for corona ring production because it is cost effective & highly resistant to weather conditions. Its relatively soft hardness makes it easy to process & polish.

1. Highly resistant to corrosion
2. Easy to weld
3. Strong mobility
4. High temperature resistance
5. Its bear’s max pressure

Corona discharge

Corona discharge is a leakage of electric current into the air adjacent to high voltage systems/Power lines. It is sometimes visible as a dim blue glow in the air next to sharp points on high voltage equipment. The high electric field ionizes the air, making it conductive, allowing current to leak from the Power lines into the air in the form of ions. In very high voltage electric power transmission lines and equipment, corona results in an economically significant waste of power and may deteriorate the hardware from its original state. In devices such as electrostatic generators, Marx generators, and tube-type television sets, the current load caused by corona leakage can reduce the voltage produced by the device, causing it to malfunction. Coronas also produce noxious and corrosive ozone gas, which can cause aging and brittleness of nearby structures such as insulators. The gasses create a health hazard for workers and local residents. For these reasons corona discharge is considered undesirable in most electrical equipment.

PROBLEMS WITHOUT USING PROPER QUALITY CORONA RINGS

Corona discharges only occur when the potential gradient at the surface of Power lines exceeds a critical value, the dielectric strength or disruptive potential gradient of air. It is roughly 30 kV/cm at sea level but decreases when atmospheric pressure decreases. Therefore, corona discharge is more of a problem at high altitudes. The electric field at the surface of a systems/Power lines is greatest where the curvature is sharpest, so corona discharge occurs first at sharp points, corners and edges.

The terminals on very high voltage equipment are frequently designed with large diameter rounded shapes such as balls and toruses called corona caps, to suppress corona formation. Some parts of high voltage circuits have hardware with exposed sharp edges or corners, such as the attachment points where wires or bus bars are connected to insulators. corona caps and rings are usually installed at these points to prevent corona formation.

The corona ring is electrically connected to the high voltage systems/Power lines, encircling the points where corona would form. Since the ring is at the same potential as the systems/Power lines, the presence of the ring reduces the potential gradient at the surface of the systems/Power lines below the disruptive potential gradient, preventing corona from forming on the metal points.

Benefits of using Corona Rings

Reducing Corona Discharge for Reliable Power Transmission

Reduced Energy Losses

Corona rings help reduce energy losses caused by corona discharge.

Reduced Radio Interference

Corona rings help reduce radio interference caused by corona discharge.

Reduced Audible Noise

Corona rings help reduce audible noise caused by corona discharge.

Improved System Efficiency

Corona rings help improve system efficiency by reducing energy losses and improving overall system performance.

Equipment Longevity

They protect high-voltage equipment from damage caused by electrical discharges, thereby extending its operational life.

Safety

By preventing ionization of air around high-voltage systems/Power lines, corona rings contribute to safer operating conditions for electrical systems.

In summary, corona rings play a vital role in enhancing the performance and safety of high-voltage electrical systems by effectively managing electric field distributions and preventing harmful discharges.

PROCESS

We Procure Raw Material From Pgcil Aprroved Vendors Only
First & Crucial Stage Of The Process Lies Here. Top Quality Fully Automatic Cnc Machine Is Used To Bend The Tube Into Circular Form. Here, Cnc Machine Plays The Major Role In Bending The Pipe. Perfect Machine Keeps The Ring From Wrinkle Free, Ovality Free & Burr Free
We Have Top Notch Frabricators With 8-10 Years Of Experience To Weld The Component.
We Have The Best Grinders & Buffers From The Market With 4-6 Years Of Experience In This Field
Inspection Goes Round The Clock To Check With The Welding & Buffing Quality.

STEPS WE TAKE TO MAINTAIN THE HIGH END QUALITY

We Use 63401w Aluminium Pipe From Pgcil Aprroved Vendor
We Use 4043 Welding Rods For Fabricating Purpose To Keep The Strength In Line. This Grade Helps The Component To With Stand The Quality & Ensures To Be With Good Quality Welding.
We Use Tig Welding Process To Withstand High Tensile Strength.
Our Welders Have 8-10 Years Of Experience In This Field.
We Use High Quality Grinding Wheels To Keep The Product In The Given Parameters. Quality Wheels Give Us The Best Output.
We Use Top Quality Buffing Wheels To Keep The Product From Burr Free. This Is The Crucial Point Where The Ring Needs To Be Very Smooth. If The Product Is Not In Smooth Condition, If It Is Not Buffed Very Well , This Product Might Be The Reason For The Damage Of The Insulator. So Buffing This Component Is Very Crucial. The Product Used To Buff & Also The Person Who Does This Job Needs To Be Very Well Trained Enough To Get The Required Quality Output Into Reality.
Keeping These Minute Things In Mind Made Us The Leading Manufacturer Of Quality Corona Rings In The Market.
We Always Ensure That Our Product Quality Speaks Loud In The Market.
We Always Blend With Market & Do The Changes Periodically To Keep The Quality In High & Give The Best Quality To Our Customers.