Standardized Medium Voltage Panels under the UniSec brand name with the use of ABB electrical equipment, suitable for indoor use. UniSec type MV panels consist of modular cubicles, each of which may include:

• Electrical equipment (switch disconnectors, circuit breakers, protection relays, fuse switch disconnectors), fixed or removable type, either in SF6 or vacuum (VD4) compartment.
• Prefabricated, metal-enclosed cubicles that use air as the dielectric means and include the above equipment. The UniSec series meet the requirements regarding the safety of the personnel, the installation, the proper operational sequence and environmental protection.

STANDARDS AND QUALITY CERTIFICATES

Both the cubicles and the equipment installed are designed, manufactured and tested according to the following standards:

• General requirements for medium voltage panels – IEC 60 694
• Metal enclosed Medium voltage panels- (1 in 52kV) IEC 62271-200
• Medium Voltage Switching Devices – AC IEC 62271-103
• Medium Voltage Disconnectors and Earthing Switches – IEC 62271-102
• Medium Voltage Circuit Breakers – AC IEC 62271-100
• Medium Voltage Relays – AC IEC 60 470
• Medium Voltage Fuse Switch Disconnectors – IEC 62271-105
• Current Transformer – IEC 60 044-1
• Voltage Transformers – IEC 60 044-2
• Current sensors – IEC 60 044-8
• High voltage fuses – IEC 60 282-1
• Medium Voltage Protection Relays – IEC 60 255
• Electromagnetic compatibility for measuring and control equipment – IEC 60 801
• Degree of protection (IP) – IEC 60 529

The quality system for the design and construction of the UniSec series cubicles is in line with the standards and requirements of the ISO 9001 quality regulations.

TECHNICAL CHARACTERISTICS

The UniSec MV panels have the following technical characteristics:

• Rated voltage: 24 kV
• Frequency: 50 Hz
• Rated busbar current: 630 A
• Switch Disconnector nominal current: 630 A
• Disconnector nominal current: 630 A
• Lightning impulse withstand voltage: 125 kV
• Power frequency withstand voltage: 50 kV / 1 min
• Short time withstand current: 16 kA / 1 sec
• IAC-AFL Internal Arc Test: 12.5 kA / 1 sec
• Degree of protection: IP41
• Degree of protection between compartments: IP2X
• Auxiliaries control voltage 220 V ac
• Ambient temperature range: -20 ~ 40oC
• Maximum operating height: 1000 m
• Cubicle height: 2000 mm
• Cubicle width: 500 or 750 mm
• Cubicle Depth: 1070 mm
• Gas duct: 70 mm