Medium-voltage Switchgear
Overview
EKA is a leading dealer and distributor of Medium voltage Mitsubishi Switchgear in India. We distribute Mitsubishi Switchgear in Chennai, Bangalore, Pune, Mumbai, Ahmedabad, Hyderabad and Delhi.
MEDIUM VOLTAGE MITSUBISHI SWITCHGEAR
7.2/12/15kV Metal-enclosed Switchgear Type MS-E
Highlights
Type testing of the MS-E was performed by an independent external testing and certification authority, KEMA, in the Netherlands.
MS-E is designed with the benefit of Mitsubishi’s vast medium voltage panels production experience of hundreds of thousands of panels over the last almost 60 years.
All components, such as current transformers, voltage transformers and multi-function relays are made of the highest quality materials.
Heat stress analysis of the switchgear structure has led to a heat-resistant design in which circuit breakers up to 3150 A are self-cooled (i.e. cooling fans not required).
The reduced number of parts reduces the chance of failure.
Partitions between compartments and an automatic shutter system (for withdrawable equipment primary junctions) completely isolate live parts.
Safe operation and maintenance is ensured with the adoption of comprehensive interlocking mechanisms.
In the event of an internal arc fault, the MS-E is designed to withstand the huge pressure and burning effect of the arc. (Relief flaps located on top of the panel open to limit pressure.)
Installation and testing duration are considerably reduced as the panel is tested and adjusted in the factory and then delivered as a complete unit.
Panels with main circuit and control cable entry from either the top or bottom are available.
Specifications
Standard – IEC 62271-200
Rated voltage(kV) – 7.2/12/15
Rated frequency(Hz) – 50/60
Rated nominal current (A) – 630, 1250, 2000, 3150, 4000* (4000A with force cooling)
Rated power freq. voltage(kV) – 20/28/36-1min
Rated lightning impulse voltage(kV) – 60/75/95
Rated short-time withstand current (kA) – 25/31.5/40
Rated duration of short-time current (sec) – 3
Dimension WxDxH[mm] (for 630A feeder) – 800 x 1500 x 2600
7.2/12kV 2 Tier Metal-enclosed Switchgear Type MS-E
Highlights
MS-E is in the highest operating continuity loss category, securing safety at the time of service and maintenance work, and a protective plate grade (LSC2B-PM class).
MS-E features mechanical and electro-mechanical interlock conditions complying with IEC62271-200.
To facilitate smooth grounding of the main circuit during service and maintenance work, the grounding switch is located on the main circuit busbar and cable draw-in circuit.
The MS-E can be transported with the drawer-type VPR/VMC*1 /VT units installed in the panel.
Sufficient space for cable termination has been secured in the main circuit cable compartment.
Inter-panel connection of the main circuit horizontal busbar is done by installing a connection conductor.
Inter-panel connection of the connection conductor is done using the bolts on either side of the connection conductor.
The MS-E design satisfies the internal arc protection classification (IAC) of AFLR.
- The “A” of AFLR restricts access to authorized personnel only, while the “FLR” means safety is required up to a height of two meters in the front (F), sides (L), and rear (R).
The interior panel drawer-type VPR/VMC/VT units can be moved from the disconnected position (test position) to the operating position without opening the panel (from outside of the panel).
- (Drawer-type VPR/VMC units have a mechanical interlock preventing open/close o
The drawer-type VPR/VMC units built into the MS-E offer the highest mechanical durability and electronic durability classifications, and comply with IEC international standards.
- VPR: Mechanical (M2), Electrical (E1, E2)
- VMC: Mechanical (25 and 2.50 mill times), Electrical (AC-3)
The VPR of the MS-E provides excellent current isolation performance thanks to combining a vacuum interrupter using spiral contacts manufactured using a new material and an electric control mechanism with a solid track record spanning many years.
The operability, serviceability and maintainability of machinery have been improved by arranging components used frequently, such as the drawer-type devices (e.g., VPR/VMC/VT units), grounding switchgear, and monitor and control devices, in a compartment on the front of the panel front, and protective devices (e.g., CT, ZCT, LA, and CR) and the main circuit cable in a compartment on the back of the panel.
The MS-E can operate up to a maximum busbar current rating of 3,150A using natural ventilation.
The incorporation of a (FBC) epoxy resin coating (FBC) having a long history of good performance when used between main circuit phases and ground connections, provides even stronger insulation for the live sections of the main circuit. (optional)
Specifications
Rated voltage(kV) – 7.2/12
Rated frequency(Hz) – 50/60
Rated nominal current (A) – 630, 1250, 2000, 3150
Rated power freq. voltage(kV) – 20/28-1min
Rated lightning impulse voltage(kV) – 60/75
Rated short-time withstand current (kA) – 25/31.5/40
Rated duration of short-time current (sec) – 3
Internal Arc Classification – AFLR 40kA/1.0sec
Dimension WxDxH[mm] (for 630A feeder) 800 x 2200 x 2600 (*235 for top air vent)