Current Limiting (C.L.) Reactor Data

This dialog box includes the following areas and tabs:

• Connection Information
• Specifications
• Harmonics
• Imported Data
• Comments
• Hyperlinks

Figure 1: Current Limiting Reactor Data Dialog Box

Connection Information

ID Name: Uniquely identifies the C. L. Reactor. This ID name is sometimes referred to as the C. L. Reactor name, and can be up to 12 characters long. The names default to CLR-1, CLR-2, CLR-3, and so on as you enter new C. L. Reactors on the one-line diagram, but you can change those names if needed.

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

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

Specifications

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 kVA_3ph = 3(I_L)²(X_ohm)/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

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 will be 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

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

Resistance Factor

EasyPower offers two methods for calculating R_H:

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

R_H = R_Fund * H ^R-EXP

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

R_H = R_Fund * (1+ECF*H²)/(1+ECF)

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

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.

Imported Data

This tab is read-only and appears only if you have imported data from an SKM Data Format file. See Importing an SKM Format File for more information.

Comments

See Comments for information.

Hyperlinks

See Hyperlinks for information.

More Information