Seamless interface

The C-Gear retrofit has been specifically designed for customers to seamlessly interface with their existing Reyrolle panels replacing outdated oil circuit breaker units with a modern vacuum circuit breaker. This can be a simple retrofit to extend life and minimise maintenance requirements or as part of a comprehensive upgrading to enhance the ratings of installed equipment.

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Serving the market

Over 40,000 C-Gear units were installed worldwide and it is estimated that 25,000 are still in service. In support of this, the C-Gear retrofit can be applied to the complete installed base of the C-Gear product type.

Your benefits at a glance

Siemens SION vacuum devices require minimal maintenance, very high switching durability of vacuum, no oil or gas to handle.

C-Gear retrofit can expand the life of existing switchgear up to 25 years.

Minimum disruption and site works required no modifications necessary to cable boxes.

Total cost and time evaluation shows considerable advantages over replacement in many high density distribution applications and also critical industrial applications.

Fully type tested on actual panel types in accordance with IEC 62271-200.

In most cases equipment can be available six weeks following order receipt.

Including comprehensive switchgear survey, condition assessment, partial discharge monitoring etc.

Added value services

A key part of any retrofit project is the added value services that can be provided. We are pleased to offer the following directly from the Siemens Service Centre, UK, Reyrolle Works:

Construction and mode of operation

The pole assemblies consist of the vacuum interrupters and the pole shells. The vacuum interrupters are air-insulated and freely accessible. The pole assemblies are fixed on the mounting plate of the operating mechanism and supported by means of the pole shell. The vacuum interrupter is mounted rigidly to the upper interrupter support. The lower part of the interrupter is guided in the lower interrupter support, allowing axial movement. The pole shell absorbs the external forces resulting from switching operations and the contact pressure.

The vacuum switching technology of the vacuum interrupters, which has been proven for 30 years, serves as arcquenching principle.

The whole operating mechanism is mounted on its mounting plate, including the motor, releases, indicators and actuating devices.

The operating mechanism is a storedenergy spring mechanism. The force is transmitted from the operating mechanism to the pole assemblies via operating levers. The closing spring can be charged either electrically or manually and latches automatically in when charging is complete. The closing spring acts as the storedenergy mechanism. To close the breaker, the closing spring can be unlatched either mechanically by means of the local “ON” pushbutton or electrically by remote control. The closing spring charges the contactpressure / opening springs as the breaker closes. The now discharged closing spring will be charged again automatically by the mechanism motor.

 

The breaker is now capable of performing the OPEN – CLOSE – OPEN operating sequence that is required for an unsuccessful auto-reclosing operation. All stored-energy mechanisms perform the switching duties of synchronizing and rapid load transfer as well as auto-reclosing.

In the event of an opening command being given after a closing operation has been initiated, the moving contacts return to the open position and remain there even if the closing command is sustained. This means that the contacts of the vacuum circuit-breakers are momentarily in the closed position.

 

The motors for charging the closing spring operate in short-time duty. Therefore the voltage and power consumption might differ from the data of the rating plate.

Technical Data

 
 
 
 
Rated Normal Current Ir 400 A 1200 A
Rated Voltage Ur 12kV  
Rated Lightning Impulse Voltage
Up CB 75kVpk
CB and back parts 60kVpk*
 
Rated Power Frequency Withstand Voltage
Ud 28 kV  
Rated Short Circuit Breaking Current
Isc 13.1 kA
25 kA
Rated Short Circuit Making Current
Ima
33 kA
63 kA
Rated Short Time Current
  13.1 kA for 3s
25 kA for 3s