SmartDCDC electrical
Bus voltage, current, DC ripple and captured disturbances.
DC measurements
Per-bus quantities · independent A and B paths
PE is a voltage reference, not a load return. On a floating two-wire system, pole-to-earth voltages can shift while pole-to-pole voltage stays normal. Sampled 5-minute extrema exclude fast transients: the capture below records a 772.4 V minimum that they never see.| Measurement | Bus A | Bus B | Unit |
|---|---|---|---|
| Pole-to-pole voltageDC mean, + conductor to − conductor | 800.2 | 800.2 | V DC |
| Positive pole to PESigned voltage to protective earth | +410.9 | +399.5 | V DC |
| Negative pole to PESigned voltage to protective earth | -389.2 | -400.6 | V DC |
| Deviation from nominal(Measured voltage − 800 V) / 800 V | +0.02 | +0.02 | % |
| Lowest 5-min mean voltageNormal-operation minimum · 24-hour historian | 799.715:30 ET | 799.317:50 ET | V DC |
| Highest 5-min mean voltageNormal-operation maximum · 24-hour historian | 800.900:30 ET | 800.522:35 ET | V DC |
| Mean bus currentOne DC path, positive toward load | 1,093.9 | 1,080.4 | A DC |
| Total RMS current√(I DC² + I ripple RMS²), derived | 1,093.9 | 1,080.4 | A RMS |
| Peak 5-min mean current24-hour historian; not a fast event peak | 1,226.708:45 ET | 1,225.108:45 ET | A DC |
| Parallel-conductor sharingNeeds individual conductor sensors | Not instrumented | Not instrumented | A / % |
| DC powerSteady-state, V DC × I DC | 875.3 | 864.5 | kW |
| Bus loading4,000 A continuous limit assumed | 27.3 | 27.0 | % |
| 15-minute demandRolling average · simulated historian | 873.3 | 872.1 | kW |
| Peak 15-minute demandMaximum in the 24-hour record | 979.9 | 977.4 | kW |
PE is a voltage reference, not a load return. On a floating two-wire system, pole-to-earth voltages can shift while pole-to-pole voltage stays normal. Sampled 5-minute extrema exclude fast transients: the capture below records a 772.4 V minimum that they never see.
Ripple & power quality
AC component on top of the DC bus
The acquisition specification, with anti-alias filtering. Hardware sets the effective bandwidth and accuracy, and the dashboard refresh is separate from waveform sampling.| Measurement | Bus A | Bus B | Unit |
|---|---|---|---|
| Voltage ripple RMSAC component after removing DC mean | 1.60 | 1.30 | V RMS |
| Voltage ripple peak-to-peakMax − min of filtered capture | 8.40 | 7.10 | V p-p |
| Voltage ripple factor100 × ripple RMS / |DC mean| | 0.200 | 0.162 | % |
| Current ripple RMSAC component · DC-capable sensor | 3.8 | 3.1 | A RMS |
| Current ripple factor100 × ripple RMS / |DC mean| | 0.35 | 0.29 | % |
- Design bandwidth
- 10 Hz–20 kHz
- Capture window
- 100ms
- Acquisition target
- 100kS/s
- Result aggregate
- 1s
The acquisition specification, with anti-alias filtering. Hardware sets the effective bandwidth and accuracy, and the dashboard refresh is separate from waveform sampling.
Distribution loss & efficiency
A + B buses · bus input to outgoing feeder meters
Loss is bus-input power minus summed feeder-output power. This boundary excludes rectifier conversion losses, and small real losses need synchronized meters with suitable uncertainty.- Bus input
- 1,739.81kW
- Feeder output
- 1,738.09kW
- Distribution loss
- 1.72kW
- Efficiency
- 99.90%
Loss is bus-input power minus summed feeder-output power. This boundary excludes rectifier conversion losses, and small real losses need synchronized meters with suitable uncertainty.
Fast event capture
Triggered local recorder · separate from dashboard polling
- Recorded minimum
- 772.4V
- Duration below 780 V
- 12.4ms
- Capture location
- Bus A input
- Sample event ID
- EVT-A-1042
Relative trigger time · Shaded band is the 12.4 ms below 780 V · Recovered, record retained
Measurement context
Definitions that travel with the data
DC ripple percentages are not AC THD. Frequency, power factor and reactive power belong to the AC meters. Displayed DC power is a steady-state V × I; real DC power uses synchronized voltage and current samples, and fast events and ripple need a local recorder with the stated bandwidth.mean(v · i)V DC × I DCDC ripple percentages are not AC THD. Frequency, power factor and reactive power belong to the AC meters. Displayed DC power is a steady-state V × I; real DC power uses synchronized voltage and current samples, and fast events and ripple need a local recorder with the stated bandwidth.