Gas-insulated switchgear for secondary distribution systems
1.Rated voltage: 24kV -36kV
2.Rated power-frequency withstand voltage 50Hz 1Min (kV r.m.s.):
– To earth and between phase: 50 / 70 kV
– Across the isolating distance: 60 /80 kV
3.Rated lightning impulse withstand voltage (peak value):
– To earth and between phase: 125 / 170 kV
– Across the isolating distance: 145 /195 kV
4.Rated current: 630A
5.Short-time withstand current: 20kA/3s
6.Peak value: 50kA
8. Protection degree: IP67
9. Altitude: <= 1000m
10. Ambient temperature: -40 to 60 °C
This specification describes the features and ratings of the NOVA recloser. The NOVA recloser shall be a three-phase electronically controlled recloser suitable for pole or substation mounting. It shall utilize shatter-resistant outdoor cycloaliphatic epoxy encapsulated axial-field vacuum interrupters. Current sensing shall be provided by three internally encapsulated current transformers. The NOVA recloser shall be available with optional Internal Voltage Sensing. The Form 6 or Form 4D electronic control, coupled with the NOVA recloser, constitutes the NOVA recloser system.
The NOVA Recloser shall be designed and tested in accordance with the following standards as applicable:
IEEE Std C37.60™-2003 standard – IEEE Standard Requirements for Overhead, Pad-Mounted, Dry Vault and Submersible Automatic Circuit Reclosers and Fault Interrupters for Alternating Current Systems
ANSI C37.61-1973/IEEE Std 321™-1973 standard – IEEE Standard Guide for the Application, Operation, and Maintenance of Automatic Circuit Reclosers.
ANSI C37.85-2002 – American National Standard Safety Requirements for X-Radiation Limits for AC High-Voltage Power Switchgear.
Rated Voltage up to 24kV
Rated Current up to 630A
Rated Short circuit withstand current up to 20kA/3s
Internal Arc Current 20 kA
Internal Arc Class (IAC) AFLR
Loss of service continuity: LSC Class LSB2B
Partition class: PM
Air-insulated switchgear for secondary distribution systems
URING Series Complete SF6 Gas Insulated Metal Enclosed Modular and Compact Switchgears (RMU) with its increased functional properties and minimized dimensions can be used in today’s advanced MV secondary distribution systems.
The RMUs suitable to use in SCADA systems are operated with Puffer system (directing the SF6 gas directly on the arc). RMU offer a unique solution to the user with its remote opening closing property even without the motor provided that the mechanism is installed previously. The RMU offer smart solutions to the user due to their compact dimensions and increased safety properties in a metal or concrete kiosk type substation in the MV secondary distribution systems.