| Calculation | Known Variables | Unknown Variables | |
|---|---|---|---|
| actiVARTM – Motor Start | Xs, Xr, Vp, Vs, actiVARTM rating, Ilocked rotor | Vsag, Vdrop | Calculate |
| Cable (Medium Voltage Shielded) | |||
|
Capacitance |
SIC, L, d, D | CCABLE | Calculate |
|
Charging Current |
SIC, L, VLL, d, D, L, f | ICHARGE | Calculate |
|
Charging Reactive Power (kvar) |
SIC, L, VLL, d, D, L, f | kvarCHARGE | Calculate |
|
Inductive Reactance |
A, B, C, f, d, K, L | XL | Calculate |
|
Inductance |
A, B, C, f, d, K, L | LC | Calculate |
|
Resistance |
Rac20C, T, L, A, B, C, f, d, K, L | RCABLE | Calculate |
|
X/R Ration |
Rac20C, T, L, A, B, C, f, d, K, L | X/RCABLE | Calculate |
|
Surge Impedance |
Rac20C, T, L, A, B, C, f, d, K, SIC, D | ZO | Calculate |
| Altitude Correction | Equipment Elevation (meters or feet), Standard Equipment Impulse Voltage (kV), Power Frequency Withstand Voltage (kV) |
Correction Factor, Sea Level Impulse Voltage (kV), Sea Level Withstand Voltage (kV) |
Calculate |
| Capacitance – Capacitors Connected in Parallel | C1, C2, C3, C4… | CTOTAL | Calculate |
| Capacitance – Capacitors Connected in Parallel | fCAP1, fCAP2, fCAP3, …, XCAP1, XCAP2, XCAP3…. | CTOTAL | Calculate |
| Capacitance – Capacitors Connected in Parallel | VCAP1, VCAP2, VCAP3… fCAP1, fCAP2, fCAP3… XC AP1, XCAP2, XCAP3, … |
CTOTAL | Calculate |
| Capacitance – Capacitors Connected in Series | C1, C2, C3, C4… | CTOTAL | Calculate |
| Capacitance – Medium Voltage Cable | SIC, L, d, D | CCABLE | Calculate |
| Capacitance – Single Phase Capacitors | VCAP, KVAR, f | C | Calculate |
| Capacitance – Single Phase Capacitors | XC, f | C | Calculate |
| Capacitive Reactance of Single Phase Capacitors | CCAP, fCAP | Xc | Calculate |
| Capacitive Reactance of Single Phase Capacitors | VCAP, KVARCAP | Xc | Calculate |
| Capacitive Reactance of Single Phase Capacitors | VCAP, KVAR, f | Xc | Calculate |
| Capacitor Voltage Decay | KVARCAP, KVLL, f | RDISCHARGE, RWATTS, RENERGY, TIMEDISCHARGE |
Calculate |
| Compensated Load KVA | KW, KVA, PFDESIRED | KVACOMPENSATED | Calculate |
| Capacitor Voltage Decay | KVAINITIAL, PFINITIAL, PFDESIRED | KVACOMPENSATED | Calculate |
| Capacitor Voltage Decay | KW, PFINITIAL, PFDESIRED | KVACOMPENSATED | Calculate |
| Capacitor Voltage Decay | KW, KVARINITIAL, PFDESIRED | KVACOMPENSATED | Calculate |
| Compensated Load KVAR | KVAINITIAL, PFINITIAL, PFDESIRED | KVARCOMPENSATED | Calculate |
| Compensated Load KVAR | KW, PFINITIAL, PFDESIRED | KVARCOMPENSATED | Calculate |
| Compensated Load KVAR | KW, KVARINITIAL, PFDESIRED | KVARCOMPENSATED | Calculate |
| Crest Current | I1, I2, I3, I4, etc… | ICREST | Calculate |
| Crest Factor (Current) | I1, I2, I3, I4, etc… | CF | Calculate |
| Crest Factor (Voltage) | V1, V2, V3, V4, etc… | CF | Calculate |
| Crest Voltage | V1, V2, V3, V4, etc… | VCREST | Calculate |
| Electromagnetic Forces on Bus Bar | Short-Circuit Current, Phase Spacing | Multiplying Factor, Bus Bar Force |
Calculate |
| Ithd – Total Harmonic Current Distortion (%) | I1, I2, I3, I4, etc… | Ithd (%) | Calculate |
| Ithd – Total Harmonic Current Distortion (PU) | I1, I2, I3, I4, etc… | Ithd (PU) | Calculate |
| Inductance – Medium Voltage Cable | A, B, C, f, d, K, L | LC | Calculate |
| KVA Reduction | KW, KVA, PFDESIRED | KVAREDUCTION | Calculate |
| Load KVA | KW, PFINITIAL, PFDESIRED | KVA | Calculate |
| Load KVA | KW, KVARINITIAL, PFDESIRED | KVA | Calculate |
| Loss Reduction in Correct PF (%) | PFINITIAL, PFDESIRED | LOSSREDUCTION (%) | Calculate |
| Motor Torque | |||
|
Accelerating Torque for Hollow Cylinders |
Weight (lbs), Outer Diameter (ft), Inner Diameter (ft), Change in Speed (RPM), Time to accelerate Total System (sec) | T (lbs-ft) | Calculate |
|
Accelerating Torque for Linear Motion |
Weight (lbs), Linear Velocity (ft/min), Speed of Driving Motor (RPM), Change in Speed (RPM), Time to Accelerate Total System (sec) | T (lbs-ft) | Calculate |
|
Accelerating Torque for Motor Shafts |
Speed of Moving Parts (RPM), Speed of Driving Motor (RPM), Change in Speed (RPM), Time to Accelerate System (sec) | T (lbs-ft) | Calculate |
|
Accelerating Torque for Solid Cylinders |
Weight (lbs), Diameter (ft), Change in Speed (RPM), Time to accelerate Total System (sec) | T (lbs-ft) | Calculate |
|
Torque |
Horse Power, Speed in RPM | T (lbs-ft) | Calculate |
| Motor Start | Xs, Xr, Vp, Vs, actiVARTM rating, Ilocked rotor | Vsag, Vdrop | Calculate |
| Peak Current | I1, I2, I3, I4, etc… | IPEAK | Calculate |
| Peak Inrush Current (Back-to-Back Switching) | kVLL, KAsc, Frequency, KVAR, µH | IPEAK | Calculate |
| Peak Inrush Current (Single Bank Switching) | kVLL, KAsc, Frequency, KVAR, µH | IPEAK | Calculate |
| Peak Inrush Current Frequency (Back-to-Back Switching) | kVLL, KAsc, Frequency, KVAR, µH | f (HZ) | Calculate |
| Peak Inrush Current Frequency (Single Bank Switching) | kVLL, KAsc, Frequency, KVAR, µH | f (HZ) | Calculate |
| Peak Voltage | V1, V2, V3, V4, etc… | VPEAK | Calculate |
| Per-Unit And Base Impedance | Base Three Phase Power, Base Line-to-Line Voltage | Base Impedance, Base Current, Per-Unit Impedance, Per-Unit Capacitor Bank Impedance, Per Unit Impedance on New MVA Base or New KVA Base, Motor Impedance and Motor Per-Unit Impedance at specified base values | Calculate |
| Power Factor (PF) | KW, KVARINITIAL, PFDESIRED | PF | Calculate |
| Power Factor (PF) | kW, KVA | PF | Calculate |
| Power Factor (PF) | kW, KVAR | PF | Calculate |
| Power Factor (PF) (1-phase) | KW, KVAR | PF | Calculate |
| Power Factor (PF) (1-phase) | KVLN, I, PF Angle | PF1 Ø | Calculate |
| Power Factor (PF) (1-phase) | KVA1 Ø, KW1Ø | PF | Calculate |
| Power Factor (PF) (1-phase) | KVA1 Ø, KVAR1Ø | PF | Calculate |
| Power Factor (PF) (3-phase) | KW, KVAR | PF | Calculate |
| Power Factor (PF) (3-phase) | KVA3 Ø, KW3Ø | PF | Calculate |
| Power Factor (PF) (3-phase) | KVLL, I, PF Angle | PF | Calculate |
| Power Factor (PF) (3-phase) | KVA3 Ø, KVAR3Ø | PF3 Ø | Calculate |
| Power Factor Angle (PF Angle) | kW, KVA | Ɵ (Degrees) | Calculate |
| Power Factor Angle (PF Angle) | kW, KVAR | Ɵ (Degrees) | Calculate |
| Power Factor Angle (PF Angle) (1-Phase) | KVA1 Ø, KW1Ø | Ɵ (Degrees) | Calculate |
| Power Factor Angle (PF Angle) (1-Phase) | KVLN, I, PF | PF | Calculate |
| Power Factor Angle (PF Angle) (1-Phase) | KVA1 Ø, KVAR1Ø | Ɵ (Degrees) | Calculate |
| Power Factor Angle (PF Angle) (3-Phase) | KVA3 Ø, KW3Ø | Ɵ (Degrees) | Calculate |
| Power Factor Angle (PF Angle) (3-Phase) | KVLL, I, PF | PF | Calculate |
| Power Factor Angle (PF Angle) (3-Phase) | KVA3 Ø, KVAR3Ø | Ɵ (Degrees) | Calculate |
| Power Factor Compensation Chart | KW, PFPRESENT, PFTARGET, Step KVAR, Dead Band Width | Var Switching Levels | Calculate |
| Reactive Power | kW, KVA | KVAR | Calculate |
| Reactive Power | kW, KVAR | KVAR | Calculate |
| Reactive Power (1-Phase) | KVLN, I, PF | KVAR1Ø | Calculate |
| Reactive Power (1-Phase) | KVLN, I, PF Angle | KVAR1Ø | Calculate |
| Reactive Power (1-Phase) | KVA1 Ø, KW1Ø | KVAR1Ø | Calculate |
| Reactive Power (3-Phase) | KVLL, I, PF Angle | KVAR3Ø | Calculate |
| Reactive Power (3-Phase) | KVLL, I, PF | KVAR3Ø | Calculate |
| Reactive Power (3-Phase) | KVA3 Ø, KW3Ø | KVAR3Ø | Calculate |
| Reactive Power Required to Correct PF | KW, KVA, PFDESIRED | KVARREQUIRED | Calculate |
| Real Power (1-Phase) | KVLN, I, PF | KW1 Ø | Calculate |
| Real Power (1-Phase) | KVLN, I, PF Angle | KW1 Ø | Calculate |
| Real Power (1-Phase) | KVA1 Ø, KVAR1Ø | KW1 Ø | Calculate |
| Real Power (3-Phase) | KVLL, I, PF Angle | KW3 Ø | Calculate |
| Real Power (3-Phase) | KVLL, I, PF | KW3 Ø | Calculate |
| Real Power (3-Phase) | KVA3 Ø, KVAR3Ø | KW3 Ø | Calculate |
| Real Power (kW) | KVAINITIAL, PFINITIAL, PFDESIRED | KW | Calculate |
| Released KVA | KVAINITIAL, PFINITIAL, PFDESIRED | KVARELEASED | Calculate |
| Released KVA | KW, PFINITIAL, PFDESIRED | KVARELEASED | Calculate |
| Released KVA | KW, KVARINITIAL, PFDESIRED | KVARELEASED | Calculate |
| Conductor Sizing under Short-Time Over-Current Conditions | Over-current Time (Seconds), Over-Current Magnitude (RMS Amperes), Conductor Material, Operating Temperature (°C), Maximum Temperature Limit (°C) | Minimum Conductor Size Needed (Circular Mills) | Calculate |
| Required Reactive Power Compensation (kvar) | KVAINITIAL, PFINITIAL, PFDESIRED | KVARREQUIRED | Calculate |
| Required Reactive Power Compensation (kvar) | KW, PFINITIAL, PFDESIRED | KVARREQUIRED | Calculate |
| Required Reactive Power Compensation (kvar) | KW, KVARINITIAL, PFDESIRED | KVARREQUIRED | Calculate |
| Resistance – Medium Voltage Cable | Rac20C, T, L, A, B, C, f, d, K, L | RCABLE | Calculate |
| RMS Current | I1, I2, I3, I4, etc… | IRMS | Calculate |
| RMS Voltage | V1, V2, V3, V4, etc… | VRMS | Calculate |
| Short Circuit Capacity (KVAsc) | Capacitor Bank kvar Rating, XFMR KVA, Transformer Impedance (%) | KVAsc | Calculate |
| Short Circuit Capacity (KVAsc) | Capacitor Bank kvar Rating, kVLL, KAsc | KVAsc | Calculate |
| Short Time Current Rating of Conductors | Conductor cross-sectional area (Circular Mils), Conductor Material, Short Circuit/Overload Current (RMS Amperes), Operating Temperature, Maximum Temperature | Time to Reach Maximum Temperature | Calculate |
| Surge Impedance – Medium Voltage Cable | Rac20C, T, L, A, B, C, f, d, K, SIC, D | ZO | Calculate |
| Total Power (1-phase) | KW, KVAR | KVA3 Ø | Calculate |
| Total Power (1-phase) | KVLN, I | KVA1 Ø | Calculate |
| Total Power (1-phase) | KVLN, I, PF | KVA1 Ø | Calculate |
| Total Power (1-phase) | KVLN, I, PF Angle | KVA1 Ø | Calculate |
| Total Power (3-phase) | KW, KVAR | KVA3 Ø | Calculate |
| Total Power (3-phase) | KVLL, I | KVA3 Ø | Calculate |
| Total Power (3-phase) | KVLL, I, PF Angle | KVA3 Ø | Calculate |
| Total Power (3-phase) | KVLL, I, PF | KVA3 Ø | Calculate |
| Voltage Rise (%) | Capacitor Bank kvar Rating, KVAsc | VRISE (%) | Calculate |
| Voltage Rise (%) | Capacitor Bank kvar Rating, XFMR KVA, Transformer Impedance (%) | VRISE (%) | Calculate |
| Voltage Rise (%) | Capacitor Bank kvar Rating, kVLL, KAsc | VRISE (%) | Calculate |
| Voltage Rise (kV) | Capacitor Bank kvar Rating, kVLL, KAsc | VRISE(kV) | Calculate |
| Vthd – Total Harmonic Voltage Distortion (%) | V1, V2, V3, V4, etc… | Vthd (%) | Calculate |
| Vthd – Total Harmonic Voltage Distortion (PU) | V1, V2, V3, V4, etc… | Vthd (PU) | Calculate |