Danfoss VACON NXP DCGuard Fact sheet
Fact Sheet
Ensure safe DC-grid selectivity with
VACON® NXP DCGuard™
VACON® NXP DCGuard™* enables fast disconnection and full selectivity between DC grids.
Utilizing DC grids rather than AC grids enables power distribution with lower power losses. However, ensuring selectivity and limited short circuit energy requires more sophisticated protection devices.
Danfoss Drives has therefore developed the VACON® NXP DCGuard™, a semiconductor protection device that can detect and cut off any faulty DC currents and isolate the faulty part of the system in microseconds.
Current range:
n465-800 VDC………3-4140 A
n640-1100 VDC…..….4-3100 A
Easy dimensioning
Rated VACON® NXP DCGuard™ DC current = Rated VACON® NXP Inverter AC current.
This means that your primary dimensioning value is the required load through the VACON® NXP DCGuard™, meaning energy transfer from one side to another. It is as easy as that.
Type approvals:
DNV-GL, ABS, Lloyd’s Register, CCS, Bureau Veritas
Current cut-off in
<5 µs
DC Grid 1 |
Short Circuit |
DC Grid 2 |
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Protection |
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VACON® NXP DCGuard™ |
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Feature
Short circuit protection
Cuts off both + and - inside the same unit
Controlled voltage ramp up
Overload detection
Standard NXP hardware
Benefit
Ensure correct system selectivity
No overvoltage spikes related to current cut-off
Connect two different DC grids with voltage differences up to full DC voltage
Protection of transmission cables
Proven and well known products
*patent pending
www.danfossdrives.com
Battery |
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G2 |
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G3 |
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1200kWh |
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2000kW |
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2000kW |
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2000kW |
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LCL |
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LCL |
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LCL |
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= V |
= DC/DC |
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~V |
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<![if ! IE]> <![endif]>AFE |
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~V |
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<![if ! IE]> <![endif]>AFE |
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VACON® NXP DCGuard™ |
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~V |
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<![if ! IE]> <![endif]>AFE |
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<![if ! IE]> <![endif]>W |
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<![if ! IE]> <![endif]>U |
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<![if ! IE]> <![endif]>U |
<![if ! IE]> <![endif]>W |
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<![if ! IE]> <![endif]>U |
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DCGuard1 |
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DCGuard2 |
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DC Grid 1 |
DC+ = |
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DC+ |
DC Grid 2 |
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L |
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DC- |
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DC- |
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<![if ! IE]> <![endif]>gridMicro |
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<![if ! IE]> <![endif]>V W |
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<![if ! IE]> <![endif]>V W |
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<![if ! IE]> <![endif]>V W |
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<![if ! IE]> <![endif]>INU |
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<![if ! IE]> <![endif]>V W |
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U~ |
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Main propulsion |
Main propulsion |
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FWD |
AFT |
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2000kW |
2000kW |
Shore supply |
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2000kW |
Hotel load |
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200kW |
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Example of hybrid system where VACON® NXP DCGuard™ ensures the required system selectivity |
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G4
2000kW
LCL |
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<![if ! IE]> <![endif]>AFE |
~VW |
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U~ |
<![if ! IE]> <![endif]>Micro |
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<![if ! IE]> <![endif]>grid |
Filter |
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Hotel load 200kW
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U~ |
<![if ! IE]> <![endif]>Micro |
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<![if ! IE]> <![endif]>grid |
Filter |
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Shore supply 2500kW
DClink voltage on feeding side. Negligible voltage dip on feeding side. DC current in connection cables.
<![endif]>DCGuard current
2
1
dt
<![if ! IE]><![endif]>Fault
3 |
faul |
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Prospective |
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current |
dI
5
4
DCGuard trip level
Time
Legend |
4. Energy discharge time. |
1. Normal situation(No fault) |
Current dI/dt=V/L |
Current is within DCGuard nominal |
V=Feeding DC voltage |
current capacity. |
L=Inductance in the circuit |
2. Fault current rise time. |
Typical time:100-150µs* |
Current dI/dt=V/L |
5. Total fault clearance time. |
V=Feeding DC voltage |
Typical time:200-300µs* |
L=Inductance in the circuit |
* System dependent |
Typical time:100-150µs* |
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3.Current cut off time.
DCGuard performs a current cut off by forcing all IGBTs open when current reaches the tripping limit of the DCGuard. Time:<5µs
DKDD.PFP.906.A4.22 |
© Copyright Danfoss Drives | 2019.11 |
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