Atec Megger-MPRT8445 - Manual (Page 12)

RIO File Import
In association with the Click-On-Fault test screen, Megger
has also included a feature called RIO Import. RIO is a file
format that defines the operating characteristic of specific
relays. Customers who already have RIO files for their
relays can import them into the Click-On-Fault RX diagram
ready to test. Shown below is a RIO file import for a SEL
321 relay. Six shot test points are defined.
Test Wizards
All versions of AVTS software come with test wizards. The
wizards walk the user through a step by step procedure to
create a relay specific test(s). Wizards are available for the
most common types of relays such as, Overcurrent,
Over/Under Voltage, Frequency, Differential, Distance,
Synchronizing and Directional. The following is a brief
description of each test wizard.
Overcurrent Wizard - Provides automatic pickup,
instantaneous pickup and timing. IEEE and IEC time curve
algorithms are provided for automatic evaluation of the
results. Digitized time curves for various
electromechanical overcurrent relays are also available.
For North American relays, a dc target and seal-in test is
available. A test report will provide pass/fail information of
the test results.
MPRT
Megger Protective Relay Test System
12
Similar to Online Vector Control, Online Ramp Control
provides manual ramping of amplitudes and/or phases.
The gang control is similar through the selection of the
vectors (Relay Test System amplifiers) to be controlled.
The outputs to be controlled in gang are selected by using
the mouse to grab and alter the parameters (see Online
Vector Control for more details). Another feature of the
Online Ramp Control is the ability to do Pulse Ramping.
One advantage of Pulse Ramping is the capability to
determine reach points on multi-zone distance relays
without needing the defeat the zone timing elements. For
relays which require a prefault load condition prior to
applying a fault value, the Online Ramp Control has a Pre-
ramp (Pre-fault) state. This feature allows the user to apply
the appropriate load values before Pulse Ramping begins.
After applying a fault value the Ramp Control returns to
the Pre-ramp state before the next value is applied. Many
of the same features in the Online Vector Control are also
available in the Ramp Control, such as the Zoom, Set
Variables and Favorites.
On-Line Click-On-Fault Control
Online Click-On-Fault, launched from the AVTS Tools
menu item, allows the user to quickly test impedance relay
characterisitcs. The user can define the type of operating
characteristic using the AVTS Theoretical Control, where
the user can select a Mho circle, Ellipse, Tomato or
virtually any operating characteristic. Characteristics can
also be predefined and imported using either the
Theoretical Object File Import or RIO File Import. To test
the user simply selects the type of fault desired (Line to
Earth, Line to Line etc) and clicks to set a test point, either
as a Shot, a Check Point or using the Search. Multiple test
points maybe selected and the software will automatically
calculate the appropriate test currents and phase angles
based upon the Settings and the Fault Type selected. In
the Settings screen the user can define Constant Voltage,
Constant Current or Constant Source Z (defined by Source
Z, Source Angle and K). If using the Search the test will
progress down a line, using click and drag, either as a
ramp or a pulse ramp looking for the relay to operate.
Test results are automatically displayed for each test point.
Click-On-Fault Test Screen with Multi-Zone Mho Distance Relay
Click-On-Fault RIO Import of SEL 321 Characteristic
Over/Under Voltage Wizard - Provides automatic pickup
and timing. A test report will provide pass/fail information
of the test results based on user input.