Megger TM1800, User Manual

Page: 52 / 104

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TM1800 ZP-CG01E CG0757JE
6 CABA LOCAL
By repeatedly pressing the button you alter the num-
ber of b-contacts per operating mech.
Breaker set up example
The setting shown above is done for a circuit breaker
with three phases and a separate operating mecha-
nism for each phase. Then it is recommended that the
TM1800 have two Control modules.
The circuit breaker has four breaks per phase. It is
probably a high voltage circuit breaker for 400 kV
(medium voltage circuit breakers have one break per
phase). For this the TM1800 needs to have two Tim-
ing M/R modules.
The Circuit breaker has one a- and one b-contact per
operating mechanism. By setting the TM1800 like
shown here it will automatically measure the contacts
in series with the operating coil. Totally six auxiliary
contacts will be measured when you have selected
separate and one a-contact and one b-contact. The
Control module will measure this and no extra cabling
is needed. If you have auxiliary contacts that are not
in the coil circuit you have to select more auxiliary
contacts i.e. if you want to measure one a-contact
that is not in series you have to select two a-contacts
in the TM1800. For other auxiliary contacts you have
to connect them to an Auxiliary module.
Resistor contacts are also chosen. By this the resistor
contact timing and the resistor value (PIR contacts) will
be measured automatically by the same channel that
measures the main contact.
Setting the pulse and delay times
1]
In Breaker View press the “PULSE AND DE-
LAY TIMES” button to make the settings. The
following submenu appears.
2]
For each operation sequence the settings
are to be done separately. Press the desired
sequence button. For each sequence the set-
tings are done as follows.
Close
1]
Use the keyboard to enter the desired value.
2]
Press the “BACK” button to leave this screen.
Open
1]
Use the keyboard to enter the desired value.
2]
Press the “BACK” button to leave this screen.
Close - Open
1]
Use the keyboard to enter the desired value.
The arrow-up and arrow-down buttons can
be used for quick navigation between the
input fields.
2]
Press the “BACK” button to leave this screen.