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SatCon Power Systems Products
Grid Support & Power Quality > Medium Voltage Static Transfer Switch (MVSTS)
The MV STS is designed
to provide a whole facility power outage and voltage
sag protection as a low cost alternative to large industrial
UPS systems when a dual distribution feeder service
is available (or the ones, which can readily obtain
a second feeder service from its local utility).
To protect a facility, campus or an industrial park from
outages of its "normal" power source (for instance,
the primary feeder connected to the closest utility substation),
the redundant or secondary feeder needs to be connected to
an independent power source. This source has to be capable
of supplying the entire load with a fraction of second notice.
Examples of such an independent and fast responsive source
are the second utility substation connected directly to a
high voltage transmission grid or an onsite cogeneration
resource also capable of backup generation.
| Ratings |
| Continuous Current (CC) Rating: |
100 A through 3000 A
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| Short-Circuit Current, 1
second: |
Up to 25 kA RMS Symm |
| Nominal System Voltage Range: |
3.3 kV through 35 kV |
| Frequency: |
50 Hz or 60Hz |
| Lightning Impulse Basic Insulation
Level, BIL: |
Up to 150 kV |
| Source
Voltage Sensing and Load Transfer Times |
| Voltage Sag Sensing and Transfer
Time: |
4.17 ms (1/4 of 60 Hz cycle)
max. |
| Voltage Swell Sensing and
Transfer Time: |
8.33 ms (1/2 of 60 Hz cycle)
max |
| Feeder Fault Sensing and
Re-Generative Load Transfer Time: |
Up to 12.5 ms (3/4 of 60
Hz cycle) |
| Other STS Unit
Technical Data |
| Minimum Efficiency at > 75%
of the CC Rating: |
99.8% (3 MVA minimum load) |
| Load Power Factor Range: |
0.5 inductive to 0.5 capacitive |
| Ambient Temperature Range: |
-10°C to 40°C standard |
| Ambient Humidity Range: |
0-95% RH non-condensing |
| Ambient Electro-Magnetic
Compatibility (EMC): |
Select IEEE, IEC, and FCC
Std. |
Notes:
1. Static Transfer Switches at low system voltage levels,
380 through 660V, 50-60 Hz, for continuous current
rating 800A through 4,000A, offered also on OEM or
custom requirements.
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| MV STS Features |
Benefits to Automated Facility Operators |
Reliable Power Outage and Voltage Sag
Ride Through Capability
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Voltage at MV STS load feeders meets the ITI (CBEMA)
voltage tolerance curve requirements provided that at
least one of the feeder is healthy |
No Energy Storage Used
|
MV STS makes use of facility dual distribution feeder
service for sourcing the power for outage and sag compensation
rather then drawing it from an energy storage device |
| Supports Large Whole Facility Load Sizes
and Fault Currents |
Single MV STS unit can support whole facility or even
the entire industrial park load bus of up to 36 MVA total
load size and fault currents to up to 10 kA for 1 second |
Application Specific Engineered Units
|
Units engineered to meet site specific requirements;
load size, system voltage, fault currents, ambient T & H
extremes |
| Utility Grid Harmonics and Load Reactances
Compatible Design |
Patent pending ferroresonance-suppressing MV STS design
ensures compatibility between utility grid voltage harmonics
and load transformer magnetizing reactances
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Environmentally Friendly
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The MV STS design utilizes power electronics ambient
air cooled |
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