3.0
THE QUICK START MENU 100 TO SET CT AND VT RATIOS
The 100 Menu allows you to set the CT ratio- voltage measurement values, target power factor setting.,
and switching time per step. This is the menu the Commissioning Engineer can use on site. Other settings
in the expert menus can be made with the help of a qualified Engineer or Technician.
Values of kW/kVA/kvar will not be correct unless the correct setting is made for voltage
(Un) and current. (Ct)
In order to make these settings we have to go into the commissioning menu 100.
How to get into menu 100:
press
◄
repeatedly to get back to the value 0....i
Now press
▼
and you see 'INFO' in the top right corner
Press
▼
again and you see 'MANUAL'
Press
▼
again and you see 'SETUP'
Press
►
and release .'100' shows in the display
Press
►
again – you are now in the commissioning menu 100. The 100 menu allows you to make the
essential settings are marked in
bold
Un – Voltage Setting
The first value you see is the Un. This is the
phase – phase voltage., not Phase-Neutral.
So for the UK for
example the setting for Un is 415v. This is the factory default setting for relays made in the UK after serial
number 1123596
If you need to change this press
►
and the first digit starts flashing – using
▲
▼
adjust as needed and key
►
to
adjust the second figure and so on. Press
►
to confirm and the digits stop flashing.
It is important to have the correct voltage setting Un because the alarm thresholds are defaulted to operate
when the voltage is +-10% from nominal Un setting.
▼
C.T Setting
To set the CT ratio key
►
and the first digit starts flashing.
Assume the CT ratio is 1000/5., which is 200/1. Always set the CT ratio as a multiplication factor to 1 so for
the CT ratio 1000/5 we set Ct to 200. The same sequence with
▼
and
►
is used for all the other settings.
▼
Pt – Voltage Transformer ratio setting
This is only used when the relay is used on MV/HV systems. The default setting is 1., but if the relay is
working on an 11kv system with 110v voltage input ., the setting for Pt is 100
▼
Ai – Automatic Initialisation
This is defaulted to NO and we recommend it is left on NO
If set to 'YES' – when the relay is first commissioned it will switch each step one by one. It will correct any
mistaken wiring of the CT.., and store the kavar values per step in its menu. We do not recommend use of
this Ai feature unless you do not know which phase the CT is on.
If Ai is ‘NO’ then no automatic switching on initial energising will take place, and the steps will be switched
in for the first time when they are required. Each time they switch their kvar value is recorded in the micro-
processor memory.
▼
PFC – Step switching Control
This control allows you to decide how you want the steps to be switched. The possible selections are :
ON - Normal switching of steps on/off as the reactive demand changes. This is the normal AUTO control
OFF – Reactive control de-activated and all steps in circuit will be switched off
HOLD – The steps switched in will remain on. The reactive control is de-activated
The default setting is 'ON'- automatic switching of steps.
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