Industrial Control System

Crompton make 132 kV SF₆ Gas Insulated Circuit Breaker, outdoor type, suitable for high voltage transmission applications, rated voltage 145 kV, rated current up to 3150 A, 50 Hz system, three pole configuration, live tank design, SF₆ gas operated mechanism with motorised spring charging. The breaker is designed for reliable interruption of fault currents with rated short circuit breaking capacity up to 40 kA and peak withstand capability up to 100 kA.

The equipment is provided with suitable control voltage (24 V DC as per requirement), low operating time (≤60 ms), and operating duty cycle O–0.3 s–CO–3 min–CO. Suitable for outdoor installation under severe environmental conditions and compliant with relevant IEC standards.

Complete breaker assembly includes operating mechanism, interrupter units, insulators, and necessary auxiliaries, as per approved drawings and GTP.

72.5 kV class outdoor SF₆ gas insulated circuit breaker, type 3AP1FG, suitable for medium to high voltage outdoor switching applications. The circuit breaker is designed, manufactured, and tested in accordance with IEC 62271-100 standards.

The breaker is rated for a maximum system voltage of 72.5 kV, with a rated normal current of 2500 A and short circuit breaking capacity of 31.5 kA for 3 seconds at 50 Hz frequency. It operates on a spring energy stored mechanism, ensuring reliable and fast switching operations, with mechanically gang operated poles.

The breaker utilises SF₆ gas as the arc quenching medium, with a nominal filling pressure of approximately 4.5 bar at 20°C and includes density monitoring for safe operation.

The equipment is provided with porcelain hollow insulators offering a creepage distance of approx. 1812.5 mm, suitable for outdoor environmental conditions.

The breaker is equipped with a robust control cubicle (IP55 protection), fabricated from sheet steel, complete with:

• Auxiliary contacts
• Mechanical ON/OFF indication
• Density monitor
• Control wiring and terminals
• Space heater and internal illumination

The operating timings include fast closing, opening, and breaking performance suitable for reliable grid operation.

Basic insulation levels include:

• Power frequency withstand voltage: 140 kV
• Lightning impulse withstand voltage: 350 kVp

The structure is made of hot-dip galvanised mild steel, designed for outdoor installation, ensuring durability and corrosion resistance.

Control and auxiliary supply requirements:

• 110V DC for closing, tripping, and spring charging motor
• 230V AC for space heater and illumination 

72.5 kV class SF₆ gas insulated Circuit Breaker from Hitachi Energy, outdoor type, suitable for high voltage transmission and distribution applications, rated voltage 72.5 kV, frequency 50 Hz, designed and type-tested as per IEC 62271-100. The circuit breaker is of three-phase construction, available in live tank or dead tank design as per requirement, using SF₆ gas as the insulating and arc-quenching medium. It employs proven self-blast (auto-puffer) interruption technology to ensure reliable switching of load, line charging, transformer, and short circuit currents under all service conditions.

Typical configurations include rated current ranging from 1250 A up to 3150 A and short circuit breaking capacity ranging from 25 kA to 40 kA for 3 seconds, with insulation levels as per IEC standards (lightning impulse withstand voltage up to approximately 350 kVp). The breaker is provided with a spring-operated, motor-charged mechanism, suitable for three-pole gang operation, ensuring high mechanical reliability, fast operation, and low maintenance. Construction generally comprises a sealed SF₆ gas system with low leakage characteristics, high-strength porcelain or composite insulators, and a robust outdoor design suitable for operation in varied environmental conditions.

The circuit breaker is suitable for switching and protection of transmission lines, transformers, reactors, capacitor banks, and other substation equipment in utility and industrial applications. Specifications are indicative and may vary depending on exact model (EDF / LTB / DTB), rating, and project requirements, and final supply shall be strictly as per approved GTP, GA drawings, and customer specifications.

Hitachi Energy make 145 kV SF₆ Gas Insulated Circuit Breaker, outdoor live tank design, suitable for high-voltage transmission and substation applications. The circuit breaker is designed in accordance with IEC 62271-100 and is intended for reliable switching, protection, and isolation under normal and fault conditions.

The breaker utilises SF₆ gas as the interrupting and insulating medium, ensuring excellent arc quenching performance, high dielectric strength, and long service life. It features a three-pole, mechanically gang-operated arrangement with a spring-operated (spring–spring) mechanism, providing fast and consistent operation.

The equipment is suitable for 145 kV systems , with rated continuous current up to 2000–3150 A and short-circuit breaking capacity of 40 kA for 3 seconds, making it ideal for critical grid applications. It offers high insulation performance with 650 kVp lightning impulse withstand voltage (BIL) and complies with standard dielectric requirements.

Designed for 50 Hz operation, the breaker includes single-break per pole configuration, porcelain insulators, and a robust outdoor construction. It is equipped with SF₆ gas density monitoring system, control cabinet, and associated auxiliaries for safe and reliable performance.

Typical performance includes fast operating times (opening ~50 ms, closing ~80 ms) and operating sequence O–0.3s–CO–180s–CO. The breaker is suitable for installation in standard ambient conditions and is widely used in utility and industrial power systems.

Applications: 132/145 kV substations, transmission networks, industrial power systems, and infrastructure projects.

Crompton (CG Power & Industrial Solutions Ltd.) make 72.5 kV class SF₆ Gas Insulated Circuit Breaker, suitable for outdoor installation, designed and manufactured in accordance with IEC 62271-100 standards. The breaker is of live tank, gang-operated, 3-pole configuration, equipped with a motorised spring-operated mechanism, ensuring reliable and efficient switching performance in high voltage transmission and distribution systems.

The circuit breaker is rated for 72.5 kV system voltage, with rated current up to 3150 A, and suitable for both 50 Hz / 60 Hz applications. It offers a short circuit breaking capacity of 40 kA, with rated short-time withstand current of 40 kA for 3 seconds, ensuring robust fault interruption capability under severe operating conditions.

The breaker operates on SF₆ gas as the arc quenching medium, ensuring excellent dielectric strength and arc interruption performance, with low gas leakage (≤1% per annum). The unit is supplied factory filled with SF₆ gas, suitable for transportation and storage, with topping-up at site as required.

It is equipped with a spring-spring (motor charged) operating mechanism, capable of standard operating duty O–0.3 sec–CO–3 min–CO, ensuring high-speed auto-reclosing capability. The breaker includes electrical and mechanical interlocking, auxiliary contacts, and reliable control circuitry for safe operation.

The breaker features fast operating times with opening and closing within specified limits, ensuring quick fault clearance and system stability. It is designed for outdoor service conditions, with suitable insulation, creepage distance, and weather-resistant construction to operate under harsh environmental conditions, including high humidity, pollution, and temperature variations.

Additional features include:

• 3-pole gang operated system
• Live tank construction
• Outdoor installation suitability
• Motorised spring charging mechanism
• Suitable for heavily polluted environments (as per IEC guidelines)
• High mechanical and electrical endurance
• Low maintenance requirement

The breaker is suitable for applications in substations, transmission networks, utilities, and industrial power systems, providing dependable switching, protection, and isolation functions.

Siemens make 145 kV SF₆ Circuit Breaker, type 3AP1FG, suitable for outdoor installation, designed for reliable switching and protection of high voltage transmission systems. The breaker is three-pole, spring operated (spring energy stored mechanism), mechanically gang operated, conforming to IEC 62271-100 standards.

Rated voltage 145 kV (system voltage 132 kV), frequency 50 Hz, rated normal current up to 3150 A, with short circuit breaking capacity up to 40 kA for 3 seconds. The circuit breaker utilises SF₆ gas as arc quenching medium with standard operating sequence O – 0.3 sec – CO – 3 min – CO.

The equipment is provided with outdoor support structure, hot dip galvanised steel framework, control cubicle with IP55 protection, density monitor, pressure gauge, mechanical ON/OFF indication, and auxiliary contacts. Suitable for substation and utility applications requiring high reliability and fast fault clearing.