CPSI assembles SFM type Outdoor SF6 Gas Circuit Breakers (GCBs) ranging from 72.5kV to 170kV. These GCBs are of live-tank design, with motor / manual charged spring-opening spring-closing operating mechanism and are capable of interrupting all possible switching duties. The breakers are single break interrupter design and employ dual flow puffer action for current interruption ensuring high operational reliability and safety of power transmission systems.

The GCBs are capable of clearing the severe rate of rise of recovery voltage due to short line faults and high recovery voltage peak due to out of phase switching. Small currents such as capacitor bank switching current, transformer magnetizing current, cable / line charging current are interrupted smoothly without any re-strikes or re-ignition and the over-voltages observed are minimum.

Construction & Operation

Depending upon the application, type SFM GCBs are divided into two types as follows:

1. Three phase auto re-closing circuit breaker with one common mechanism for Transformer applications.
2. Single / Three phase auto re-closing circuit breaker with three separate spring mechanisms for Line applications.

The breaker consists of three main parts:

1. Vertical porcelain units containing puffer type interrupter.
2. Spring-spring operating mechanism and control equipment in a single housing.
3. Base Frame and support columns.

The SF6 GCB Product Features

• Easy & convenient in installation, fault-detection and operation.

• In compliance with the new IEC-62271-100 and ANSI standards.
• Insulation with enhanced cree page distance allows for installation in highly polluted areas without changes in dimensions.
• Type tested at recognized international laboratories: CESI Italy, KERI Korea, KEMA Netherlands.
• All range of Circuit Breakers is certified to achieve C2 & M2class as per IEC 62271-100.

The SF6 Gas Circuit Breaker (GCB) Products range is High Voltage Gas Circuit Breaker (HV GCB):

• 72.5kV outdoor type up-to 3150A, 40kA
• 170kV outdoor type up-to 3150A, 40kA

Routine Testing

All routine tests as specified in IEC, are conducted on the fully assembled GCBs at our factory. In addition to the specified tests as per IEC, the following tests are also carried out on each breaker:

• MECHANICAL OPERATION TESTS
• CONTROL & AUXILIARY CIRCUIT CHECK
• MEASUREMENT OF SPEED & TIME (NO LOAD OPERATINGCHARACTERISTICS)
• DCRM TEST as per Customer requirement.
• CONTACT RESISTANCE MEASUREMENT
• HIGH VOLTAGE TEST ON MAIN CIRCUIT
• HIGH VOLTAGE TEST ON CONTROL & AUXILIARY CIRCUIT
• GAS LEAKAGE TESTS
• GAS DENSITY SWITCH OPERATION TESTS
• MEASUREMENT OF TRIPPING & CLOSING COIL RESISTANCE

CPSI testing laboratory is fully equipped with the latest testing equipment:

• 1000 kV Resonant Test System
• Gas Leak Detector (with capability to detect leaks as low as 1 ppm).
• Multi-Channel Breaker Speed / Time Analyzers.
• Mechanical Endurance Controller
• Contact Resistance Meter (Static)
• Dynamic Contact Resistance (Signature)

Transport & Site Installation

All the Circuit Breakers are factory tested and then depending on the type involved are partly dismantled into packing units which are dispatched. All the sub-assemblies are individually wrapped to reduce the harmful effects of atmosphere.

The Circuit Breaker Poles are filled with a small quantity of SF 6 Gas for Transportation (at a gauge pressure of 0.5 kg/cm²) to avoid moisture ingress and evacuation at site.

Customer Support & After Sales Service

We provide solutions to all possible Technical requirements to Customer through our highly qualified Engineers.

Our Service Engineers, Technicians and Authorized Representatives can provide services supervision of Erection and Commissioning and After Sales Service at site.