Supreme & Co Private Limited Bhowanipore, Kolkata, West Bengal

This connector is made of C-body & Wedge type core. C-body in turn places high forces on the conductors for a reliable, stable connection. Available in both with bolt and bolt less type. Used for tapping purpose and service connection.

All kinds of transmission towers right from 33kV to 220kV is possible from our side.   Our Expertise includes:           Suspension towers with 0 deg deviation Suspension towers with 0-10 deg deviation Angle towers with 10-30 deg deviation Angle towers with 30-60 deg deviation Dead-End/ River Crossing Tower Sub-Station Structure   We handle right Route Survey, Design, Testing   till Erection and Commissioning, all as per International Standards                 

Traditional over head transmission lines have been built on lattice type structures. For years, this has been found structurally stable and time tested solutions and there was hardly any reason for change. However, of late, significant ROW and aesthetic issues have stalled construction of new transmission line corridors and replaced them with transmission monopole. With rapid urbanization and spread of industrialization over existing agricultural lands, solutions with narrow corridors and smaller footprints is the crying need of the day for completion of critical transmission corridors. Replacement of traditional structures with monopole kind of structures is a significant step in this direction. Advantages of transmission monopole ◊Less right-of-way ◊Small foundations take less land and hence reduce the foot-print ◊Efficiently erected along highways and railway lines ◊Significant wind-loading capacity ◊Less components, fast installation Material Testing, Dimension Testing, Crack Detection, Galvanizing Testing ◊Better reliability under extreme conditions  ◊Flexibility in design Testing & Validation •CPRI (Central Power Research Institute) •SERC (Structural Engineering Research Centre) •Richardson and Cruddas

Transmission of Electrical Power in bulk for a long distance is done through overhead lines where the power flows through Conductors which are supported by Insulators from Towers.The Conductors are always of stranded type and as the quantum of power goes up, instead of single conductor, bundle conductors are adopted in the same phase viz., twin, triple, quad, hexagonal, octagonal etc. Whenever multi-bundle conductors are used, in order to avoid clashing between sub-conductors and thereby resulting in damage of conductor, Spacer Dampers are deployed to maintain sub-conductor spacing throughout the run of line as well as to control vibrations on conductors. Conductors are exposed to wind and act as a taut string thereby are subjected to different types of vibration/ oscillatory movements. Mainly following types of vibrations/oscillations may occur depending on surrounding conditions: 1)AeolianVibration: This occurs under laminar flow of wind due to vortex shedding from the leeward side of the conductor and is the most common type of vibration.This high frequency low amplitude vibration generates bending strain at conductor clamping points owing to cyclic movement and give rise to fatigue failure of conductor.In case of bundle conductors,Spacer Dampers are deployed to limit such vibrations and bending strain within safe limits. 2)Sub-SpanOscillation: Out of four classes of wake-induced motion in a bundled conductor system,sub-span oscillation occurring in more or less horizontal plane is more common and the other three classes are rigid body modes.The leeward conductors that lie in the wake of windward conductors are subjected to forces permitting wind-induced motions to occur. Sub-span oscillation takes the form of single or more loops in sub span between spacer dampers with nodes at or near the spacer damper clamp with elliptical trajectories on more or less the same horizontal plane and mostly windward-leeward pair moving in phase opposition.This occur with low frequency but high amplitude compared to Aeolian vibration causing bending stresses at spacer damper clamping points. Supreme make Spacer Dampers along with their distribution on the span are designed suitably to take care of sub-span oscillations within safe permissible limits. 3)Galloping:   This happens in case of ice-loading on conductors. When ice deposited on conductor starts melting, initially melting takes place as drop by drop. After some time, a bulk part of ice gets dropped resulting in a reaction force on opposite direction and in most cases in an angular plane. This results in a torsional mode of vibration at low frequency and high amplitude and the conductor starts galloping. Since galloping will occur in case of ice condition which is not prevailing everywhere,Spacer Dampers are generally designed and developed to take care of Aeolian vibration and Sub-span oscillation. The following are the problems associated with bundled conductors due to Aeolian vibration and Sub- span oscillation Damage of spacers & spacer dampers Damage to conductors under the clamps Damage to hardware connecting conductor to insulator strings Spacer damper:   IS:10162-1982 defines Spacer dampers as mechanical components fitted at specified intervals on transmission lines having more than one sub-conductor per phase to perform all functions of a spacer and in addition control Aeolian vibrations and sub-span oscillations within permissible limits. Construction:   A spacer damper for transmission line cables comprises of a substantially planar frame and a plurality of clamping arms each resiliently pivotally connected to the planar frame at one end and provided with clamping means for respectively grasping individual conductors at the other end.   The frame is of rigid one-piece construction and provided at each region of pivotal connection with a recessed portion into which the end of the arm extends so as to lie substantially in the plane of the frame.Each arm is resiliently pivotally connected to the frame by a pair of spaced resilient energy absorbing elements located on either side of the arm to be traversed by the bolt and lockingly engaged with recesses formed in the arm. Each recessed portion of the frame is provided with at least one end cap, itself provided with a recess for lockingly engaging one of the elements, the end cap being rigidly secured to the frame by the locking bolt so as to straddle the recessed portion, hold the elements in compression and thereby secure the arm for resilient hinged part rotation relative to the frame. Working Mechanism: A spacer damper must incorporate some mechanism that allows large relative movements of one conductor clamp with respect to the other and this mechanism is called articulation. A spacer damper uses an energy absorption mechanism based on the deformation of elastomer elements.The damping of vibrations is carried out by converting the vibrational energy to stresses in the spacer damper. Each articulation contains one or more elements which are deformed by the relative movement of the arm with respect to the central frame of the damper. Hence the deformation of the rubber elements results in compressive stresses and shear stresses. However, only one of them dominates depending upon the articulation design. Hence, the construction of the rigid planar structure must be capable of handling the stresses induced due to vibrations of the conductor.The spacer damper has energy absorption capability in both the vertical and horizontal planes to account for both Aeolian vibrations and sub-span oscillations respectively. Design: The spacer damper shall be designed as per IEC 61854 specifications stated below: Maintain sub conductor spacing,within any prescribed limits,under all conditions of service excluding short-circuit currents. Prevent, in sub spans between spacers, physical contact between sub conductors, except during the passage of short-circuit currents when the possibility of contact is accepted provided that specified spacing is restored immediately following fault clearance. Avoid damage to sub conductor under specified conditions. To be free from unacceptable levels of corona and radio interference under specified service conditions. Withstand mechanical loads imposed on the spacer damper during installation, maintenance and service without any component failure or unacceptable permanent deformation. Be suitable for safe and easy installation. For the bolted and latching clamp the design shall retain all parts when opened or attached to the conductor. Ensure the individual components do not become loose in service. Be capable of being removed and re-installed without damage to spacers or sub conductors. Maintain its function over entire service temperature range. Avoid audible noise. For details of Test Report please download the Brochure.

We take this opportunity to introduce ourselves as one of the manufacturers & Suppliers of Polymer Insulators. We are doing all the necessary Type tests & Design tests for Polymer Insulators for 11, 22 & 33 KV (Disc & Pin type) at CPRI-Bangalore & ERDA-Vadodhara. Polymer Insulator is introduced as an excellent & proven technology, which is replacing the existing porcelain Insulators all over the world. Due to its properties, technology, durability & other value added advantages some Electricity Boards in India also adopted this technology for their states. Power Grid Corporation of India, NTPC and Indian Railways had already started to install / replace the existing porcelain Insulators with Polymer Insulators. Polymer insulators have the following utilities:   Light weight ( up to 70% less than Ceramic insulators). Ease of installation as easier to handle and transport. Outstanding resistance to environmental factors such as U.V. light , ozone, acids, contaminations and moisture. Silicone Rubber shed s provide perfect Hydrophobic performance, hydro-phobicity transfer in to pollution layer also possible, good resistance to ageing and tracking & erosion. Stable behavior at extreme climatic conditions -50 to + 50 deg C. Suitability for polluted and salty atmospheres etc. Resistance to breakage and vandalism , practically unbreakable. Eliminates or reduces maintenance ( such as washing) and are compatible with existing porcelain insulators. Energy Efficiency (Low leakage current due to more surface resistivity). Safety( Light weight for handling and installation, eliminates catastrophic mechanical failures). Consistent mechanical and electrical performance through out entire service life.

Supreme is India`s largest manufacturer of Pole Line Hardware and have served the industry since 1972. We supply a parallel range of Pole line Hardware products designed for Power Utility providers. Each product is carefully designed and crafted to provide superior performance, reliability, and longevity in the field. We have over 500 items within our manufacturing range and we pride ourselves on our Design Engineering and Custom Manufacturing capabilities.

These connectors are designed for indoor and outdoor non-tension tap. It is mainly used for splicing purposes on insulated secondary distribution lines. IPCs are recommended for use on combinations of insulated copper and aluminium conductors. It is designed to sustain all weather conditions Easy to install.

Normal OH lines are vulnerable to natural disasters like flood, storms etc. The suspension   poles, tension poles, pole with distribution transformers may get severely damaged due to disasters causing outages of power for a very long time. Normal maintenance takes longer period to rectify the damaged equipment/ structure to restore power supply. This trailer mounted mobile sub-station can act as a substitute of any kind of poles i.e. Tension, suspension & DT pole and acts as “Emergency Restoration System” in distribution system. The Emergency Restoration System will contain all the equipment the distribution sub-station contains i.e. the bus stringing equipment complete with hardware, surge protection system, switching system, fuse protection system, distribution transformer, LV protection system with fuses etc. The Emergency Restoration System will have the anchoring system suitable of all kind of soils i.e. marshy soil, rocky soil and normal soil & concrete. All the equipment mounted i.e. LAs, Dropout fuses, AB Switch, Insulators,Hardware and Distribution Transformers will be proof tested and will be of fail safe quality. Transformer used will be of ‘AN’ cooled in place of oil cool transformer which will be absolutely hazard free. In the Trailer mounted s/s the transformer is not mounted on pole, but positioned at the base of the trailer to reduce the overall weight on the pole. The poles are divided into three parts and all are fixed on the trailer. However the top two parts will be erected on top of the bottom most with the help of GIN pole, the mechanism is showing in the above diagrams. LA, Transformer body are separately earthed.

support the “line” mechanically & maintains an Air Gap ARC PROTECTION DEVICES The atmospheric over voltages caused by lightning and, in some cases, network overloads may cause conductor breaks, particularly in the case of covered conductors and these are protected by arc protection devices.

Application : Control Panels

Condition : New

Tensile Strength : 0-25Mpa, 125-150Mpa, 175-200Mpa

Feature : Easy To Install, Four Times Stronger, Proper Working, Sturdy Construction, Superior Finish

Warranty : 5years

Temperature : High Temperature

Puncture Voltage : 0-50Kw, 100-250Kw, 250-500Kw, 50-100Kw, 500-1000Kw

Insulation piercing connectors provides connection between main and derived cable by perforation of insulation. It is provided with piercing teeth made of tinned copper for high-conductivity connection. Bolt is fully insulated with a Thermoplastic shear head. Piercing teeth and pierced cables are protected from water entry by in built seals around the conductor teeth. If desired, a special grease is filled on end caps for water protection.

Freedom of Movement provided to the conductor determines the clearance required for the line. Clearance should be provided for both inward and outward swing of the conductor. For Suspension Tower, Freedom of Movement is very high and hence more clearance will be required.       In Insulated cross arm, Insulators are directly fixed to the tower. This eliminates the use of metallic cross arm. With the freedom of movement restricted, the conductors will be unable to swing, which reduces the clearance level and making the line compact. Post works under Compression and Brace works under Tension. With advancement in composite insulator technology, the use of insulated cross arm in high voltage transmission is making an impact. Countries conducted studies on compact line design Spain: IBER-DUERO, S.A. carried out a study to optimize line design of a short length of 2.34km of a 132kV transmission line. Composite insulators were considered to form a rotary cross-arm where a rigid column insulator was placed horizontally working in tension and long rod composite insulator used as a tie-bar working in tension. Both were joined to form an apex from which conductor clamp is suspended. The other ends of both insulators were fixed to the tower by universal joints to allow rotation of the cross-arm about an inclined axis in case of broken wire condition. Italy: ENEL conducted studies to determine limits of line compaction. Rotating insulator cross-arms were considered. France: EDF carried out studies to develop methods for design of compact high voltage lines at 90kV. An experimental line of 1200m was built to study the feasibility of various compaction techniques. Composite insulators were adopted for insulated cross-arms to form both rigid and pivoted types. Japan: Studies extensive tests were carried out to develop polymeric inter-phase spacers for 66kV transmission lines to find effective means for dealing with conductor galloping under ice loading. Inherent flexibility of polymeric composite insulators helps in attenuating vibrations of conductors during galloping.

Helical fittings are composed of multiple helical rods which are manufactured for a particular application meant for specific conductor that are in separated or pre-assembled form, straight or looped. Helical fittings are now already in use for a wide variety of applications. However, the range of its application continue to expand. There may be many more applications hidden in the womb of the future, which we cant even foresee today. This presentation in respect of the application of helical fittings mainly refers to T&D application especially to the use on overhead lines and distribution systems. Helically formed accessories can be used as dead end termination, to support and to connect conductors, cables. In addition helically formed accessories are used to protect or to repair conductors, for attachment to pin insulators, as spacers on bundled conductors and for anchoring the street lighting brackets. They are also successfully used to prevent birds from coming in accidental contacts with the conductors. Helically formed accessories have been used very successfully since 1950. The employment of helical fittings is not at all limited to overhead lines only. Helically formed accessories in a large measure are also used for the construction of antennas, radar stations & for providing support to the columns in case of pre-engineered buildings & for anchoring submarine cables to the ships during periodic maintenance or repairs. The effect of helical fittings is mostly based on the principle of development of a low unit clamping strength by uniformly distributing the clamping load over a large cross sectional area. The inside diameter of the unapplied helical rods is slightly smaller than the outside diameter of conductor, cable or solid rod. Helically formed fittings provides a very good gripping force and prevents it from slipping under tension To ensure the full performance, the helical fitting must be matched to the outside diameter of conductor, cable or solid rod. In addition, helical fitting and outer strand of conductor must be of same lay direction. Unless specified otherwise, helical fittings are of right-hand lay on delivery. Hence, it is necessary to specify on order if helical fittings for left-hand lay conductors or right hand lay. In general, helically formed fittings are made from a material similar to that of conductor or solid rod in order to avoid bimetallic corrosion due to contact. The helical rods can be installed without use of any tool, therefore incorrect assembly is almost impossible. It can be detected by mere eyesight whether it was correctly installed. Hence, helical fittings can be installed by the workers with proper guidelines. Helical fittings are provided with a label stating for which function and for what conductors, cables the respective accessory is designed for. Helical fittings can be used:   for tension / dead end termination                                                                       for suspension for splicing Dead-End/ River Crossing Tower for repairing to armor to protect against damage to protect against abrasion to reduce stress to mark to space to damp vibrations to pull (installation) to shunt weak splices as inter-phase spacer to increase diameter of stranded conductors, cables and solid conductors.

UPREME FUSE LINK (Expulsion Type) Fuse cut-outs play very important role in system and equipment protection on overhead distribution systems. The key determinant of a cut-out's ability to function properly is the fuse link it uses. Failure of the fuse link to perform as planned can result in mis-coordination with other protective devices, nuisance operations and needless outages. To a utility that's money and not just the cost of the replacement fuse link. The expense of finding and replacing fuse links that sneak out can cost many times the up-front savings achieved through the use of less-expensive fuse links. SUPREME's Fuse Links eliminate nuisance fuse operations and, at the same time, provide reliable protection in the event of a fault within the cut-out's zone of protection. They're manufactured in accordance with a quality system certified to ISO9001:2000. Salient Features High Mechanical Strength. SUPREME Fuse Links have permanently accurate time-current characteristics as per IEC-60282-2 (Tests on Heat Run & Time Current Characteristics have been successfully carried out from Jadavpur University, Kolkata ). They're unaffected by mechanical shock, vibration, or transient current surges that heat the element nearly to the severing point—eliminating sneak-outs. Close Melting-Current Tolerance. SUPREME Fuse Links have a melting-current tolerance permitting closer fusing for improved protection, more precise series coordination for enhanced service reliability. Superior Fault-Interrupting Performance. SUPREME Fuse Links provide protection against all types of faults, including low-current transformer secondary-side faults. Constructional Features FUSE ELEMENTS Elements consist of special alloy wire to protect from overheating during full load. The fuse elements are crimped jointed by ferrule/sleeve with stranded tinned copper flexible wire rope tails made of 37 SWG wires. The overall Dimensions of 11 KV D.O. fuse elements tails are shown in the drawing. FIBER GLASS TUBE The central portions of the Fuse Elements are having a protecting device made of good quality FIBER GLASS TUBE which are manufactured from the best quality of Electrical grade insulating materials of high temperature range. FLEXIBLE TAIL ROPE WIRES FLEXIBLE TAIL ROPE WIRES The D.O. fuse elements are crimped jointed by ferrule/sleeve with two stranded tinned copper flexible wire rope tails made of 37 SWG. Stranded tinned copper flexible wire ropes are manufactured by our own stranding machine from Electrical Grade 100% tinned copper wires.

Base section of the tower.                                                                                                                            To support the tower by distributing its weight evenly to the ground. It can be installed at leveled ground or up to a 30 degrees angle. Designed for soft soils with minimal bearing capacity. Bearing capacity-capacity of soil to support the loads applied to the ground.

TEMPORARY BY-PASS FOR                                                                                        RE-CONDUCTING WITH MINIMUM OUTAGE   Characteristics of ERS-Tower   Foundation plate Articulating gimbal joints Column section Guy and insulator attachment plate Anchoring solution Composite insulated cross arm Composite insulator for Tension Hardware assembly for support and dead end insulator. Shield wire support and dead end assembly hardware.

Covered conductors consist of a conductor surrounded by a covering made of insulating material as protection against accidental contacts with other covered conductors and with grounded parts such as tree branches, etc. In comparison with insulated conductors, this covering has reduced properties, but is sufficient to withstand the phase-to-earth voltage temporarily.   ACCESSORIES FOR COVERED CONDUCTORS Insulators Connectors Live line and Earthing connectors Cross-arms Tension & Suspension fittings Arc protection devices & Current Limiting Devices Surge arresters

Corona Control Rings are deployed in EHV/ UHV level for dual purpose of reducing electrical stresses to ensure extinction of corona below a certain voltage level thereby reducing losses due to corona as well as taking care of voltage grading along insulator string. The design of CC ring also ensures Radio Interference Voltage (RIV) under the acceptable limit. Surface Voltage Gradient on surface of conductor are calculated for Transmission Lines and Sub-stations and are kept within safe limit with respect to corona inception.   Design of CC Ring for 1200kV Transmission Line and Sub-Station Hardware  - A technical Landmark Achieved by SUPREME Corona Control (CC) Rings are deployed in EHV/ UHV level for dual purpose of reducing electrical stresses to ensure extinction of corona below a certain voltage level thereby reducing losses due to corona as well as taking care of voltage grading along insulator string. The design of CC ring also ensures Radio Interference Voltage (RIV) under the acceptable limit. Surface Voltage Gradient on surface of conductor are calculated for Transmission Lines and Sub-stations and are kept within safe limit with respect to corona inception. 1200kV system need special attention on the design aspect of CC Rings in view of the large dimension of the CC Ring to cover a large Hardware Fitting set. Surface Voltage Gradient on surface of conductor was calculated for Transmission Lines and Sub-stations and found within safe limit with respect to corona inception. Selection of CC ring has been done by covering a much larger diameter and effective surface area and hence performance with respect to Corona Inception and Losses will be within limit. To achieve this, 100mm diameter 6063 Grade Aluminum Alloy extruded tube with 5mm thickness was selected. Bending of such tubes called for new and higher capacity bending machines along with new dies which were developed in-house. CC ring for Tension Hardware is of such large dimension, it was fabricated(bend) in two halves. Two Couplings having inner diameter close to the tube's outer diameter have been deployed at the two adjoining points of the two halves of CC ring. To facilitate smooth fitment, the couplings are tapered inside from the centre to the outermost point on either side. Opening up of CC ring has been arrested by two structural steel flats bolted with the bracket of CC ring and fastening both the halves of CC ring together.  Studies were conducted by M/s Decan Enterprises to determine voltage distribution along insulator string. Polymer Insulator with Octagonal bundle conductor were considered with two types of outer Corona Control/ Grading rings viz., 700mm and 1100mm ring diameters. Comparative Results of the following:

It ensures most of the  connector functions viz. tapping and terminal etc. The materials used for Lug should consist high strength and high conductivity. These are available for aluminium, copper, steel conductors and  its bi-metallic combinations. It  provides moisture ingress  protection and prevents rainwater from entering cable. Lug should coated oxide inhibitor to prevent oxidation.

Connecting the tower to the foundation plate.  Allows a rotation of tower 360 degrees in all direction Makes it easy to erect the tower. Allows the tower installed on uneven ground Guy and insulator attachment plate HT Steel (Gr. IS 2062) Guy plate used to connect the guy wire and polymer type insulator to the tower. It takes very less time to install.

Substation Connectors: It joins two or more conductors or substation components. It provides conductive path between the conductors being joined. Selection of substation connectors for use on overhead applications is dependent on the conductor type viz. Aluminium, ACSR, Copper etc. Electrical connection must exhibit low contact resistance and high conductivity. Based on function connectors may be classified into tap, terminal and splice. SELECTION & DESIGN CRITERIA                      Light weight                     High mechanical strength                     High conductivity Design Requirements:                      Good surface-to-surface  attachment                     High mechanical withstand capacity                     Low resistance                     Low corona effect