What are the different types of switchgear?
The three categories are:
- High Voltage (H.V.) Switchgear.
- Medium Voltage (MV) Switchgear.
- Low Voltage (LV) Switchgear.
What is 15kv switchgear?
Eaton’s VacClad-W switchgear is a metal-clad, medium voltage switchgear that can be custom-engineered to fit a wide array of application and safety requirements.
What is the selection criteria for switchgear?
Satisfactory performance. Compatibility among the individual items; from the rated current In to the fault-level rating Icu. Compatibility with upstream switchgear or taking into account its contribution. Conformity with all regulations and specifications concerning safe and reliable circuit performance.
How do you size a switchgear?
Before you can order switchgear, you need to determine what size breakers you will need for each feeder. You also need to determine conductor ampacities….Feeder No.
- I=kVA x 1000/(V x 1.732) I=569.19kVA x 1000/(13,800V x 1.732)
- Amps at 13,800V=27.88A.
- I=kVA x 1000/(V x 1.732)
- Amps at 13,800V=15A.
- I=kVA x 1000÷(V x 1.732)
What is AIS and GIS switchgear?
The construction of each type of switchgear impacts its longevity and maintenance. GIS uses the gas sulfur hexafluoride for insulation, whereas AIS uses air insulation in a metal-clad system. Sulfur hexafluoride is five times heavier than air and offers excellent extinction behavior.
What is a switchgear PDF?
16.1 Switchgear The apparatus used for switching, controlling and protecting the electrical circuits and equipment is known as switchgear. The switchgear equipment is essentially concerned with switching and interrupting currents either under normal or abnormal operating conditions.
What is the voltage level of LV switchgear?
Likewise, LV switchgear operates at the voltage level of 1.1 kV maximum. Irrespective of particular voltage levels, switchgear are known for their complete reliability, quick operation, and absolute isolation compared to other similar devices.
How do you convert HT amps to LT amps?
- We can calculate HT amps and LT amps with the help of Transformer capacity in VA (Voltampere)
- In single phase Transformer , HT voltage * HT ampere = LT voltage * LT ampere.
- For example a single phase Transformer rating 400 VA , HT voltage 200 Volts & LT voltage 100 Volts.
- HT ampere = 400/200 = 2 amps.
What is SFU and Mccb?
In SFU, in event of fault or s/c, fuse link blowsof & needs to replace the same by new one. In case of MCCB, only reset is necessary, butin the event of more faults, the wear & tear at contacts in MCCB may lead to single phasing.
What is PM class switchgear?
Partition class PM(partitions metallic=partitions & shutters made of metal): Medium voltage metal enclosed switchgear providing continuous metallic partitions and/or shutters(if applicable),intended to be earthed, between opened accessible compartments and medium voltage live parts.
What type of switchgear is used in medium voltage consumer substation?
Medium-Voltage Switchgear Design Gas-insulated switchgear should be used for the medium voltage consumer substation. The advantages of gas-insulated switchgear are: Lower space requirements (up to approx. 70 % savings with 30 kV) compared to air-insulated switchgear
What are the standards for the design and installation of MV switchgear?
Standards for the Design and Installation of MV Switchgear The standards distinguish between two main groups of medium-voltage switchgear: Factory-assembled, type-tested plants with: Metal enclosure in accordance with IEC 62271-200 (VDE 0671-200)
What are the current ratings of the switchgear?
Standard metal-clad switchgear is offered with the Advance® platform featuring current ratings up to 63kA and 4000A. Dedicated switchgear versions designed for the requirements of emerging markets are available in India and China. IEC Ratings up to 36 kV, 40,5 kV GB and a dedicated 46 kV UniGear ZS3.2 switchgear version
Which switchgear should I choose for my project?
Projects with tight space constraints will benefit greatly from ReliaGear ® ND, ABB’s narrow-design platform, which features a 26-inch wide, two-high, stacked breaker frame design at 5 and 15 kV. Standard metal-clad switchgear is offered with the Advance® platform featuring current ratings up to 63kA and 4000A.