Digital Protector
Voltage – Current
and
Frequency control
ke-DP01
Phase Sequence Control
Under Voltage Protection
Unbalanced Voltage
Protection
Over Frequency
Protection
Under Frequency
Protection
TRUE RMS
Latch Function
V
L1
,
V
L2,
V
L3
V
L12,
V
L23,
V
L13
I
L1,
I
L2,
I
L3
Hz
General:
In three phase systems, it measures RMS values of AC voltages,
currents and system frequency sensitively. Using up direction button
(Select) phase-neutral voltages and phase-phase voltages monitor
sequentially.
ke-DP01 has many features.
Those are;
- Phase Failure
(seq)
- Phase Sequence
(seq)
- Over Voltage Protection
(o - U)
- Under Voltage Protection
(u - U)
- Voltage Unbalance (asymmetry) Protection
(unb)
- Over Current Protection
(o - C)
- Under Current Protection
(u - C)
- Current Unbalance (asymmetry) Protection
(ubC)
- Over Frequency Protection
(o - F)
- Under Frequency Protection
(u - F)
When device is turn on if its adjusted voltages and frequency in its
interval and if phase sequence is correct relay sw itch on.
If any of error occurred ( except phase failure and phase sequence )
at the end of adjusted time relay sw itch off its contact. When system
return normal values, at the end of time out relay sw itch on.
L1
L2
L3
Re
< t-1
t-1
Phase Failure: (u-U)
Before starting system , it controls phase absence then if all phases
exits Normal LED turn on and relay contact sw itch on. In case of
missing of any L1,L2,L3 phases , Normal LED turn off and relay
sw itch off its contact .In this case
u-U
w arn appears
on display.
V
L1
Special Buttons:
L1
L2
L3
V
L2
V
L3
L1
L2
L3
V
L12
L1
L2
L3
V
L23
L1
L2
L3
V
L13
Select:
(Up direction)
w hen pressing continuously,
screen displays frequency of
system. When button release
device continue to show voltage.
Reset:
If error case although disappeared
then device is not return to normal,
latch-function occurred and it
makes locked device.
Or Lock-function (only for
currents) may be occured.
After checking error in system
then restart device w ith pushing
reset button.
IM PORTANT:
L1 - N is device supply inputs. Thus,the applied L1 – N
voltage must be rated voltage of system . Otherw ise normal led
makes flash and the device sw itched off its output contact.
The measured frequency also must the frequency of the system.
Voltage Unbalanced: (unb)
The phase-phase voltage unbalance limit can be adjusted betw een
(5% - 20%) . When it exceeds the adjusted limit , the device
sw itched off its out contact at the end of t-1 delay. In this case
unb
w arn appears on the screen. For the returning normal state,
asymmetry values should under 20% (hysteresis value). In this
case at the end of t3 time Normal LED turned on and output contact
sw itch on. If the phase-phase voltage unbalance, return adjusted
value shorter than t-1 time, output relay does not release its
contact. Hysteresis is 20 %.
unb
= 000(oFF) protection is disable .
Exam ple:
Let's say that asymmetry value is set to %15 for a
3 x 380VAC.
In this case, relay contact sw itch off at (380-(380x0.15))=323 V.
Sw itch on the contact is performed at 323+(380x%15x%20)= 334V.
(%20 is the hysteresis).
Re
L1,L2,L3
L2,L3
L1
L2
L3
Phase Sequetion: (Seq)
In case of w rong phase order , Normal LED turned off and relay
contact is not sw itch on. In this case
seq
w arn appears on the
screen. If phase order is corrected , Normal LED turned on and out
relay sw itch on.
hy s
+ % unb
V
nom
hy s
Lev el
Re
- % unb
t-1
< t-1
t-1
L1,L3,L2
L1,L2,L3
r-t
r-t
Over Voltage Protection
Under Current Protection
Unbalanced Current
Protection
Over Current Protection
L1
L2
L3
L1
L2
L3
1
Display Functions:
(V
max
- V
min
)
% unb =
x 100 Hys = 380 x (% Asm) x (% 20)
380
AREAS OF OPERATION:
■ In-Elevator motors protection
■ On-pump and electric motor
■ Resistance in oven w ith
