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Option Descriptions
Option	Description
Generator’s Exciter Symbol to Step A step response test on the exciter of a generator lets you to see the effect of increasing the excitation by a specified amount. The AutoPlot tab plots the per-unit generator terminal voltage and the per-unit field voltage. This test treats the generator as isolated from the network. The step test is performed by double-clicking on the generator exciter symbol in the one-line. These options are available only if Dynamic Stability has been purchased.
Vref Step	This is the percent increase in the reference voltage.
Initial Terminal Voltage	The terminal voltage in percentage of rated voltage before the step is applied.
Simulation End Time	Simulation is run up to this time.
Delay Time Length	The step is applied after this delay after the simulation begins. For example, if you specify the delay time length as 1 second, then the step in Vref occurs 1 second after the simulation begins.
Generator’s Governor Symbol to Step A step response test on the governor of a generator enables you to see the effect of increasing the load by a specified amount. The generator speed changes. The AutoPlot tab plots the per-unit generator prime mover power and the per-unit speed. The step test is performed by double-clicking on the generator governor symbol in the one-line. These options are available only if Dynamic Stability has been purchased.
Initial Load	Percent load on the generator at the beginning of the step response test.
Load Step	Percent increase in the generator load.
Simulation End Time	Simulation is run up to this time.
Delay Time Length	The step is applied after this delay after the simulation begins. For example, if you specify the delay time length as 1 second, then the step in the load occurs 1 second after the simulation begins.
Breaker or Switch to Open You can double-click on a breaker or a switch to open or close it.
Simulation End Time	Simulation is run up to this time.
Delay Time Length	The breaker or switch is opened after the specified delay after the simulation begins. For example, if you specify the delay time length as 1 second, then the breaker or switch opens 1 second after the simulation begins.
Breaker or Switch to Close	You can double-click on a breaker or a switch to open or close it.
Simulation End Time	Simulation is run up to this time.
Delay Time Length	The breaker or switch is closed after the specified delay after the simulation begins. For example, if you specify the delay time length as 1 second, then the breaker or switch closes 1 second after the simulation begins.
ATS to Transfer You can double-click on an ATS to transfer the connection to the alternate source.
Simulation End Time	Simulation is run up to this time.
Delay Time Length	The ATS connection is transferred to an alternate source after the specified delay after the simulation begins. For example, if you specify the delay time length as 1 second, then the ATS transfers the connection 1 second after the simulation begins.
Bus to Fault You can double-click on a bus to simulate a bus fault (short circuit).
Fault Resistance	Resistance at the fault point in ohms. A bolted fault has the fault resistance of zero.
Fault Reactance	Resistance at the fault point in ohms. A bolted fault has the fault reactance of zero.
Simulation End Time	Simulation is run up to this time.
Delay Time Length	The fault is performed on the bus after the specified delay after the simulation begins. For example, if you specify the delay time length as 1 second, then the fault occurs 1 second after the simulation begins.
Fault Time Length	The duration for which the fault lasts. If the fault time length is specified as 0.1 seconds, the fault is removed automatically 0.1 seconds after the fault is applied.

Generator’s Exciter Symbol to Step

A step response test on the exciter of a generator lets you to see the effect of increasing the excitation by a specified amount. The AutoPlot tab plots the per-unit generator terminal voltage and the per-unit field voltage. This test treats the generator as isolated from the network. The step test is performed by double-clicking on the generator exciter symbol in the one-line.

These options are available only if Dynamic Stability has been purchased.

Vref Step

This is the percent increase in the reference voltage.

Initial Terminal Voltage

The terminal voltage in percentage of rated voltage before the step is applied.

Simulation End Time

Simulation is run up to this time.

Delay Time Length

The step is applied after this delay after the simulation begins. For example, if you specify the delay time length as 1 second, then the step in Vref occurs 1 second after the simulation begins.

Generator’s Governor Symbol to Step

A step response test on the governor of a generator enables you to see the effect of increasing the load by a specified amount. The generator speed changes. The AutoPlot tab plots the per-unit generator prime mover power and the per-unit speed. The step test is performed by double-clicking on the generator governor symbol in the one-line.

These options are available only if Dynamic Stability has been purchased.

Initial Load

Percent load on the generator at the beginning of the step response test.

Load Step

Percent increase in the generator load.

Simulation End Time

Simulation is run up to this time.

Delay Time Length

The step is applied after this delay after the simulation begins. For example, if you specify the delay time length as 1 second, then the step in the load occurs 1 second after the simulation begins.

Breaker or Switch to Open

You can double-click on a breaker or a switch to open or close it.

Simulation End Time

Simulation is run up to this time.

Delay Time Length

The breaker or switch is opened after the specified delay after the simulation begins. For example, if you specify the delay time length as 1 second, then the breaker or switch opens 1 second after the simulation begins.

Breaker or Switch to Close

You can double-click on a breaker or a switch to open or close it.

Simulation End Time

Simulation is run up to this time.

Delay Time Length

The breaker or switch is closed after the specified delay after the simulation begins. For example, if you specify the delay time length as 1 second, then the breaker or switch closes 1 second after the simulation begins.

ATS to Transfer

You can double-click on an ATS to transfer the connection to the alternate source.

Simulation End Time

Simulation is run up to this time.

Delay Time Length

The ATS connection is transferred to an alternate source after the specified delay after the simulation begins. For example, if you specify the delay time length as 1 second, then the ATS transfers the connection 1 second after the simulation begins.

Bus to Fault

You can double-click on a bus to simulate a bus fault (short circuit).

Fault Resistance

Resistance at the fault point in ohms. A bolted fault has the fault resistance of zero.

Fault Reactance

Resistance at the fault point in ohms. A bolted fault has the fault reactance of zero.

Simulation End Time

Simulation is run up to this time.

Delay Time Length

The fault is performed on the bus after the specified delay after the simulation begins. For example, if you specify the delay time length as 1 second, then the fault occurs 1 second after the simulation begins.

Fault Time Length

The duration for which the fault lasts. If the fault time length is specified as 0.1 seconds, the fault is removed automatically 0.1 seconds after the fault is applied.

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