Alstom SHPM 101 - Section 6. LIVE SYSTEM CHECKS; 6.1 Signalling channel check; 6.2 Trip test; 6.3 Final setting checks

SERVICE MANUAL R5888C
QUADRAMHO Chapter 5
Page 21 of 24
An engineer will be required at each end of the protected line and some form of
verbal communication is necessary.
The test options to be used in the channel check have already been checked in
Sections 5.2, 5.3 or 5.4.
At end B select test option 41 and the signal receive will be indicated by the LED
marked SOTF. At end A select test option 62 and set SW8 to the right. When the
reset button is pressed, the signal send contact will close and the signal receive
indication should be obtained at end B.
The procedure should then be reversed.
Section 6. LIVE SYSTEM CHECKS
6.1 Signalling channel check
If the scheme requires the use of a signalling channel and the check has not been
done recently then test 5.5 should be repeated.
6.2 Trip test
Auto reclose should be inhibited.
If test option 88 is then selected (its function has already been checked in
Section 4.17) the appropriate trip contacts can be made to operate by moving the
corresponding SW switches to the right as shown on Figure 7.
When the reset button is pressed, the selected trip contacts will close and the
circuit breaker will operate if the trip links have been inserted and the breaker is
closed.
6.3 Final setting checks
The check list Figure 8 should now be used to ensure that all the switches are
correctly set on the relay. Test options 54, 55, 56 and 57 should be selected in
turn to check that the LED information agrees with the switch positions on the check
list.
If schemes 00, 01, 02, 03, 08 or 09 are being used, test option 56 need not be
checked as the settings for t
p
and t
D
are not used in the schemes.
6.4 On load tests
6.4.1 Voltage transformer checks
Insert a test plug in the 1Z position without any links. The relay available LED will
not be illuminated.
i) With the line energised, check the voltage input to the protection across each
pair of phases and between each phase and neutral. (The red test plug
terminals, see Figure 1).
ii) Check for correct phase rotation with a phase rotation meter.
6.4.2 CT/VT phasing check
To ensure that the corresponding voltage and current go to a given relay element,
it is necessary to check the phase angle between them agrees with the known load
power factor. If the information available is in terms of import/export MW and
MVAR, Figure 10 gives guidance.