Atec EuroSMC-Mentor-12 - Manual (Page 13)

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DIFFERENTIAL MODULE
Differential shot test
Differential relay characteristic editor
Technical data
Harmonic Restraint Test
The set of differential test modules is used to test the operation of protective devices that implement
the IEEE function 87 and includes the following four modules.
CLASSIC DIFFERENTIAL 87C: The module is distributed in the following sections, among others:
Technical Data: To set up the general parameters associated with the data of the protected object,
the characteristics of the protective device and the applied settings: number of windings, tap settings,
restraint current calculation, current and time tolerances.
Differential Operating Characteristic: For configuration of the characteristic and the operating times
of the relay, as well as defining the parameters for the harmonics restrain. In tests designed for
harmonic restrain in differential relays, ROOTS allows to add a certain component of a harmonic to the
fundamental frequency value. Although the common practice is to work with the 2nd harmonic (Inrush
Blocking) and 3 ° or 5 ° (Blocking by over excitation), harmonics from the second to the eighth can
be manipulated.
TRANSFORMER DIFFERENTIAL 87T: Designed for testing numerical relays for differential protection
of transformers.
Technical Data: an extensive modeling of the protected device and the relay data gathers all the data
for the calculations required to facilitate testing, suitable for transformer differential schemes with up
to 3-windings and up to nine currents to be injected.
The automatic calculation of the test currents eliminates the most time consuming and error-prone manual
tasks.
The Relay Data gathers all the data defining the operation of the protective relay: reference current,
restraint current calculation, phase reference winding, maximum test current, current and time
tolerances, remove zero sequence settings, etc.
Differential Operating Characteristic: Configure the characteristic and the operating times of the relay,
as well as defining the parameters for the harmonics restrain. It includes single slopes, double
continuous and discontinuous slopes and user-defined curves, with easy programming of pickup
thresholds, slope of segments, change points and offset.
GENERATOR/MOTOR DIFFERENTIAL 87GM: Designed for testing rotating machines differential relays.
Technical Data: the setting of Generator/Engine Data gather all relevant data from the protected machine
and from the current transformers used by the differential protection. Reference current, Ibias
calculation, and time and current tolerances are set in the relay data.
Verification Test: The Verification test provides a method to check the consistence between the
protected device, the relay settings, the Differential module's setup, and the test connections. This test
simulates load conditions and/or external faults under which the relay's differential element should
not operate. The assessment of each test point consists of verifying that the differential element did
not operate and that the quantities measured by the relay fall inside the tolerance threshold set.
Click Sequence Test: Allows the user to verify the accuracy of the relay at determining if a fault falls
inside or outside the protected zone. This test generates test sequences from test points defined by
the user in the test window. Each test point will include pre-fault, fault and post-fault stages.
Search Test: This tool provides a method to locate the boundaries of the relay's characteristic. A series
of consecutive faults are injected that gradually enter the searched zone. This method reveals the actual
accuracy of the relay.
BUSBAR DIFFERENTIAL 87B: Designed for testing busbar differential relays.
Technical Data: Up to 6 feeders connected to the busbar can be configured, with the corresponding
setting of the CT data for each feeder. Directional blocking technique used by some relay manufacturers
can also be activated in this module.
Operating Characteristic: ROOTS allows editing of the relay characteristic in a simple way by choosing
from a set of predefined types or by custom building one when necessary.
Test List: Multiple tests can be attached to each differential module from the test types:
- Click sequence - Verification
- Search - Harmonic restraint, etc.
Mentor12 EN v3_SMC fichas 09/08/13 15:10 Página 13