GENERAL OVERVIEW
OPERATION
Example 1.
START
OVERCURRENT
occurs
Low-set I>
triggered
Time out
commences
High-set
I>>
triggered?
N
Y
TRIP!
Timeout
complete?
N
Y
P9650
PRESENTATION
1. Time Multiplier adjustment*
2. Low-Set I> trip adjustment*
3. High-Set I>” trip adjustment*
4. Power Supply green LED indication
5. Low-Set triggered red LED indication
6. High-Set triggered red LED indication
7. RESET button
8. TEST button
* accessible only when the front cover is open
7
8
5
6
4
1
2
3
¬
True R.M.S. measurements
¬
Adjustable Low-set and High-set tripping threshold ( with option to
disable High-set tripping)
¬
Adjustable Time Multiplier for defining curve trippi ng characteristic
(applicable to Low-set only)
¬
Normal Inverse 3/10 tripping characteristics (Low-se t threshold only)
¬
Instantaneous tripping on High-set triggering
¬
Test and Reset button for simulating and clearing of fault condition
¬
Red LED indication of Low-set or High-set triggering and tripping
¬
Green LED indication for Auxiliary power supply presence
¬
Microprocessor based (self checking) with non- volotile memory
2
¬
Terminals suitable for 2 x 2.5mm wires (complete with protective cover)
Inverse Denite Minimum Time
(IDMT) Overcurrent Relay
The P9650 (from the P9600 series family of IDMT/DT relays) is a microprocessor
based relay designed to monitor and detect
over currents
in 3-phase
applications. Typically the P9650 is wired in conjunction with external current
transformers (1 per phase) of the feeder to be protected.
Adjustments & indicators are laid out in a way to help the user during set-up and
fault finding. eg. The adjustment for the LOW SET has its corresponding red
LED positioned above it so it is clear which function this LED relates to.
The same applies to the HIGH SET adjustment & LED.
Adjustment and LED operation is explained further on the next page.
The adjustment for TM (k), which defines the curve response to tripping, is
assigned to the LOW SET triggering only. The HIGH SET does not have any
additional adjustments nor does the HIGH TRIP INSTANTANEOUS if triggered.
The HIGH SET can be set to disabled, if required.
A T EST mode is provided to confirm the correct operation of the internal relays.
The relay will energize when the TEST button is pressed and de-energise when
the RESET button is pressed.
When an over current occurs in one of the phases and the level of the current
exceeds the LOW-SET I> trip threshold, the corresponding red LED above
the adjustment illuminates. The time out then commences, no matter the
point at which tripping occurred either by:
A) the level of current that is above the trip threshold.
B) the Time Multiplier Setting.
When tripping finally occurs, the red LED will then flash indicating a
tripped condition. If the fault current has been removed, pressing the RESET
button will return the relay back to normal operation & the red LED will
then extinguish.
Example 2.
If a fault current occurs such that it exceeds the HIGH-SET I>> trip
threshold, the relay will de-energise with no delay & the red LED above the
HIGH-SET I>> adjustment will flash indicating a TRIPPED condition.
If the fault current has been removed, pressing the RESET button will
return the relay back to normal operation. The red LED will then extinguish.
In the event of an
over current
condition, the basic sequence of events is
shown below assuming HIGH-SET trip is enabled.
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Dimensions:
W x H. 96 x 96mm (front)
W x H. 89.5 x 89.5mm (rear)
D. 107mm
