BECKWITH ELECTRIC M-3520, Instruction Book

Page: 145 / 217

M-3520 Instruction Book
6–12
6.5 Functional Test Procedures
This section details the test quantities, inputs and
procedures for testing each function of the M-3520
Intertie Protection Relay. The purpose is to confirm
the function’s designated output operation, the
accuracy of the magnitude pickup settings, and the
accuracy of time delay settings. Whereas the first
test described, “
Power On Self Test, ” does not
require electrical quantity inputs, all other functional
tests require inputs, and the necessary connection
configurations as specified in the test procedure.
In all test descriptions, a process for calculating
input quantities to test the actual settings of the
function will be given if needed. In many test cases,
it will be necessary to disable other functions not
being tested at the time. This action is to prevent the
operation of multiple functions with one set of input
quantities that could cause confusion of operation of
outputs or timers. The complete description of the
method to disable or enable functions may be found
in detail in Section 3.2,
Configure Relay Data, or
Chapter 4, Operation (Computer) . The complete
description of the method to install setting quantities
is found in detail in Section 3.2, Setpoints and Time
Settings.
It is desirable to record and confirm the actual settings
of the individual functions of the relay before
beginning test procedures. Use the
FUNCTIONAL
CONFIGURATION RECORD FORM and the
SETPOINT AND TIMING RECORD FORM found in
Appendix A for recording settings.
The tests are described in this section in ascending
function number order as in Chapter 2,
Application .
Depending on which functions are to be tested at a
given time, an order may be determined with the aid
of Table 6-1, Functions to Disable When Testing.
This may result in fewer changes in connections and
disable and enable operations.
During the lifetime of the relay, testing of individual
functions due to changes in application settings will
be more likely than an overall testing routine. An
index of the individual test procedures is illustrated
at the beginning of this chapter.
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NOTE : Care must be taken to reset or re-enable
any functions that have been changed
from the intended application settings when
the test procedures are complete. When a
function is re-enabled, both output
arrangements and blocking input
designations must be reestablished.
It may be desirable to program all test settings in an
alternate profile, or to save the relay settings in
IPScom
®
to preserve a particular setup.
Many options for test sequences and methods are
possible. As an example, the operation of the output
contacts can be tested along with the operation of
the LED’s in the Diagnostic Test Procedures. The
operation of the output contacts may also be
confirmed with the LED and function operation during
Functional Test Procedures, Section 6.5, if desired.
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NOTE : Output 8 has been especially designed to
be used as the Reconnect output. Any
protective function assigned to this output
will not display a target LED if it operates.
If timer quantities are to be checked, the timer must
be activated by the appropriate output contacts. The
contact pin numbers are enumerated in Table 6-2 ,
Output Contacts.
It is suggested that copies of the following be made
for easy referral during test procedures:
• Input Configurations - page 6–11
• Output Test (Relay)- page 6–4
• Relay Configuration Table - page A–2
• Setpoint & Timing Record Form - pages
A–9 to A–12