Current Limiting (C.L.) Reactor Data

This dialog box includes the following areas and tabs:

See Common Tabs for information on the Location, Comments, Hyperlinks, or Collected Data tabs.

Figure 1: Current Limiting Reactor Data Dialog Box

Connection Information

Option Description
ID Name

Uniquely identifies the equipment item. The program automatically assigns a name, but you can change it, if needed. The name can be up to 16 characters long.

For current limiting reactors, the program automatically assigns the names CLR-1, CLR-2, CLR-3, and so on.

From Bus The bus from which the equipment connects, which must already exist on the one-line. For your reference, the From Bus base kV is displayed next to the bus name. You must be careful that the From Bus has the same base kV as the To Bus.
To Bus

The bus to which the equipment connects, which must already exist on the one-line. For your reference, the To Bus base kV is displayed next to the bus name. You must be careful that the To Bus has the same base kV as the From Bus.

Phase

The phase of the item. Currently, this is for reference only.

Specifications Tab

Option Description
Ampacity

This field provides a list of industry standard reactor ampere ratings, but you can also type in a rating which is not listed.
Impedance kVA

3-phase reactor impedance kVA. This value is used to determine the impedance and X/R ratio of the reactor. If this value is not known, you must enter the positive and zero sequence impedance (X1 and X0) to compute the X/R ratio with the Calculate button. The Impedance kVA is calculated with the following equation:

Impedance kVA3ph = 3(IL)2(Xohm)/1000
Material

Reactor material (copper, aluminum, or high-Q aluminum). This value is used to determine the X/R ratio of the reactor.

Figure 2: CLR X/R Ratio w.r.t. Device Rating
Impedances
X1 Positive sequence impedance. When filled in with the Calculate button, this field’s value is based on the reactor impedance kVA.
X0 Zero sequence impedance. When filled in with the Calculate button, this field’s value is considered the same as the positive sequence impedance X1. If you enter this value as zero (0.0), the positive sequence impedance is used.
X/R Ratio The reactance to resistance ratio of the reactor. When filled in with the Calculate button, this field’s value is based on the impedance kVA and the material type of the reactor.
Calculate Fills in computed values for the X1, X0, and X/R fields. You can override these values by typing in different numbers.

Harmonics Tab

Use the Harmonics tab to indicate whether this equipment item is introducing harmonics into your power system.

Figure 3: Harmonics Tab

Option Description
Resistance Factor

EasyPower offers two methods for calculating RH:

  • Resistance varying with a power of the harmonic (R-EXP):

    • RH = RFund * H R-EXP

  • Resistance varying with a percent eddy current factor (%ECF):

    • RH = RFund * (1+ECF*H2)/(1+ECF)

EasyPower defaults all skin effect correction to R-EXP and a value of 0.5.

Typical Resistance Correction Factors

  R-EXP %ECF

Transformer

0.5-1.0

1.0-3.0

Utility

0.0-0.8

    -

Generator

0.3-0.6

    -

Line/Cable

0.5

    -

Reactor

0.5-1.0

0.8-3.0

Motor

0.2-0.4

    -
Fundamental Amps

Use to set the fundamental amps. The options are as follows:

  • Equipment Rating sets Fundm Amps to the equipment rating of the item described in the Specifications tab. 
  • User Specified activates the Fundm Amps field, enabling you to specify a value. 

To use fundamental current calculated by power flow, select Calculated from Power Flow in the Summation Fundamental Voltage area of the Harmonics Options > Control dialog box.

Other Tabs

See Common Tabs for information on the Location, Comments, Hyperlinks, or Collected Data tabs.

More Information

Database Technical Reference Common Tabs
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Help was last updated on 3/22/2019