Electrical Data Tab (Electrical Motor Common Properties Dialog) - Intergraph Smart Electrical - Help - Hexagon

Intergraph Smart Electrical Help

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Smart Electrical Version
10

Provides information about the electrical motor properties based on the mechanical power requirements. Note that the software makes non-compensated calculations.

Electrical power

The software calculates the electrical power based on load data for the motor. Note that these calculations are non-compensated. (For details about non-compensated values, see Calculating Bus Load Summaries.) Note that the values are all read-only.

The software can perform the calculation at three operating points:

Rated

Maximum power.

Consumed

Normal operation at the motor brake power.

Particular

An additional point that you can specify.

Active

Shows the quantity of electrical power in kW drawn from the network and supplied to the motor that is actually converted to mechanical work.

Reactive

Shows the quantity of reactive power in kVAR that the motor draws from the network.

Apparent

Shows the quantity of electrical power in kVA that represents the vector sum of the active and reactive power. This quantity is the actual power that the network needs to generate.

Average

Shows the average electrical power consumption for the motor. The software uses the average electrical power consumption to calculate overall electrical load requirements. The software calculates the average load by multiplying the consumed active electrical power by the operating factor that you entered on the Load Data tab.

Full load current and locked rotor current data

Override FLA calculation

Select the required option.

Calculated

Based on the rated power and rated voltage values entered in the Load Data tab the software calculates the full load current. You can type a value for the Locked rotor current or the LRC to FLA ratio properties. After you have entered one of these values the software calculates the remaining value.

  • The calculated value overwrites any previous value.

  • Use locked rotor indicating code doesn't function in Calculated mode.

Manua

Allows you to type a value for the Full load current. After typing in a value, you can then type a value for the Locked rotor current or the LRC to FLA ratio properties. After one of these values has been entered the software calculates the remaining value.

Use locked rotor indicating code doesn't function in Manual mode.

Tables

Enables the use of NEC or other lookup tables to apply values for the Full load current and Locked rotor current. properties. This requires you to select NEC as the value for Conformity to Standard on the General tab and import the NEC lookup tables into your plant. See Importing Typical Reference Data in the Options Manager help. Select Use locked rotor indicating code if you want the software to calculate the Locked rotor current based on the maximum value for the specified indicating code letter. Clear Use locked rotor indicating code to apply a value from the lookup table.

The Full load current, Locked rotor current, and the LRC to FLA ratio properties are read- only in Tables mode.

Full load current (FLA)

The electrical current, in amperes, that the motor draws from the supply when operating at maximum power. The full load current usually appears on the motor nameplate. You can modify the value of this property only when you select Manual from the Override FLA calculation list. Note that in the Calculated mode, the actual value calculated depends on whether the motor is single- or 3-phase. When the motor has an attached cable, the software copies this value to the cable and uses it as a default value for sizing the cable.

Locked rotor current (LRC)

Shows the initial electrical current, in amperes or kilo amperes, required to start rotation of the motor. The software calculates this value automatically when values for the full load current and the LRC / FLA ratio already appear. Note that in Manual mode, if you want to enter a value in this field manually so that the software can calculate the value of the LRC / FLA ratio, you must first type a value for the Full load current property. When you select Tables as the value of the Override FLA calculation property, you can select an indicating code letter for the software to calculate a value. The software uses the following formula when calculating locked rotor currents (kVA/hp):

MotorRatedPower*CodeIndicatingFactor*1000/ k*RatedVoltage

where k = SQRT(3) if there are 3 phases and 1 if there is one phase.

The CodeIndicatingFactor value is taken from the imported lookup table LockedRotorIndicatingCodeLetters.

LRC to FLA ratio

Shows the value of the ratio of locked rotor current to full load current, usually shown on the motor nameplate. The software calculates this value automatically when values for the full load current and the locked rotor current already appear. Note that in Manual mode, if you want to enter a value in this field manually so that the software can calculate the value of the locked rotor current, you must first type a value for the Full load current property.

Use locked rotor indicating code

Select to enable the Indicating code letter (kVA / HP) list and then select a code letter from the list. Some manufacturers indicate the code letter on the motor nameplate. This option is only available when you select the Tables mode.

Indicating code letter (kVA / HP)

Select the code that specifies the power requirement for the motor with locked rotor, applicable if you are working with the NEC standard. Each code letter represents a specified range of kilovolt- amperes per horsepower with locked rotor.  The software uses the highest value in the range to calculate the locked rotor current.

Manage Operating Cases

Opens the Manage Operating Cases dialog where you can add, edit, or delete property values specific to various plant operating cases that exist for the current plant item.