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Letöltés PDF
Oldal 1/4
Operation Principles
The current information fed through main current transformers is
transferred to the electronic circuits by the built in current transformers.
The delayed tripping-current I>adjustment (Set current) is done by
means of the current adjustment circuit connected to the seconder side
of these built in current transformers. By using the dip switcheson
the front panel, independent current adjustments can be done for the
phases and neutral separately. By means of the warning LEDs of each
input, one can detect which phase/neutral includes the fault. In addition,
The fault information is stored by a memory function even if the input
power to the relay is OFF. The AC voltage related with the faulty current
at the current circuit is converted to a DC signal and transferred to the
microprocessor. This measured value is then compared with the set
current value. If measured value exceeds the setting value, the NORMAL
led will turn off immediately and when the measured value will reach the
1.05 times of the set value the PICK-UP led will turn on and time
counting process, starts. If the current falls below 0.95 of the set value,
the tripping process is resetted, the led: PICK-UPturns off and the
led:NORMAL turns on. When the time counter reaches to a value
determined by the related current-time characteristics, the LED associated
with faulty input turns on. If a higher overcurrent is detected from another
input during this tripping time, associated with current-time characteristics,
the time related with this overcurrent I>>and the remaining tripping
time are compared and the relay is energized at the end of the smaller
interval. If the faulty current is greater than the instantaneous set current,
the relay is de-energized without delay for the completion of the tripping
time (if dip-switch: INSTANTANEOUS is ON). When this dip-switch is
OFF, instantaneous relay tripping is not performed. At the phase faults,
only phase relay is turned OFF while both the phase and neutral relays
are turned OFF in the case of earth faults. The test button on the front
panel is to test the functioning of the relay. When this button is pressed,
the relay behaves as if all inputs experience an overcurrent. The RESET
button is used to erase the recent fault information from the memory.
*In CKR 81T and CKR 91T type earth fault relays,Test function96 96
is operational by pressing test button only if test enable switch is on
(test on).
Adjustments
1. The Selection of Set-Current
The set currents I> for each phase and neutral can be adjusted from
1A to 16.75 A (for neutral: 0.2A - 3.35A) by means of dip-switches. The
dip switches I> include six stages and turned ON by pushing them
right. The set-current for all phases is 1A and that for neutral is 0.2A
when all switches are in OFF position. The set-current is calculated by
adding a value (1 for phases, 0.2 for neutral) to the values written on
the right of the switches. The set-current when all switches are ON:
For Phases:
Iset = 1 + 0.25 + 0.5 + 1 + 2 + 4 + 8 = 16.75 A.
For example, to adjust Iset=6.5 A, the switches:2,3,5 are to be turned ON
Iset = 1 + 0.5 + 1 + 4 = 6.5 A
For neutral;
Iset = 0.2 + 0.05 + 0.1 + 0.2 + 0.4 + 0.8 +1.6 = 3.35 A
For example, to adjust Iset=1.3 A, the switches: 2,3,5 are to be turned ON.
Iset = 0.2 + 0.1 +0.2 +0.8 = 1.3 A
2- Selection of Instantaneous Current
With, I>> dip switch, this current can be adjusted within 2-17 times set
current. I>> switch includes 4 stages. Instantaneous overcurrent
change-over ratio is twice the set current when all switches are OFF.
In other words, instantaneous change-over is not performed until the
operating current reaches twice the set current. The instantaneous
change-over current (when all switches are ON) is given by:
I>> = 2 + 1 + 2 + 4 + 8 = 17
For example, to adjust the instantaneous current as 13 times the set
current the switches: 1,2,4 are to be turned ON, i.e.,
I>> = 2 + 1 + 2 + 8 = 13 .
3- Selection of Time Factor
Time factor can be adjusted, by dip-switch, from 0.05 to 10 with steps
of 0.1. Time factor is 0.05 when all switches are OFF. When any of
the swiches are turned ON (unlike I> and I>> switches) 0.05 (first value)
is not added to the sum.
The time factor when all switches are ON can be found from:
Xt = 0.1 + 0.2 + 0.3 + 0.4 = 1.0
For example, to adjust the time factor to 0.6, the switches 2 and 4 are
to be turned ON, i.e., and if the independent time 1 (2.5sec.) is selected
Xt = 0.2 + 0.4 = 0.6 from then 2.5x0.6=1.5sec.
4- Mode Selection
Mode dip switch includes 4 stages and the first one controls the
instantaneous tripping ON or OFF. With the other three switches, 8
different current-time characteristics can be selected. The current-time
characteristics corresponding to dip-switch positions are given on the
following table.
General
New generation, microprocessor based CKR series overcurrent relays
combine both inverse time and independent time relays in one unit.
These relays are used for the purpose of protecting the equipments such as
transformers, motors, generators, and power lines in energy distribution
systems against short circuits and grounding faults.
The most important point to achieve the uppermost protection is to apply
selective protection. The main purpose of selective protection is locating
and disconnecting the faulty circuit from the network as soon as possible but
leaving the rest of the network active.
During selective protection, the whole energy system including the future
expansions must be taken into consideration. Realization of this selective
protection necessitates the coordination of the protection relays included in
the distribution line; which in turn entails the conditions stated below as
regards to inverse-time overcurrent relays. The accurate protection by the
inverse-time overcurrent relays can be accomplished provided that the
following conditions are met:
1) Relays having the same operation characteristics should be used in series
with each other.
2) Tripping intervals of the relays used within the system must be adjusted
in the form of current/time steps. Current dependent tripping-time adjustment
of the relays should be done in such a way that the current/time steps
should be reduced as getting away from the source. Thus, the relay at the
end of the line (R4 in the following figure) should have the shortest tripping
time. This situation can be best observed from the schematics and time-
current characteristics below:
Another important point is that the time adjustment of the relay closest to the
source must be done very accurately. The time delay should be as long as
possible to provide selectivity and as short as possible to protect the power
supply on time.
Types
1. CKR- 9XX series overcurrent protection relays include four different inverse-
time and four different independent time characteristics. According to IEC-255,
BS-142 these are:
a- Normal Inverse
b- Very Inverse
c- Extremely Inverse
d- Long Time Inverse
e- Independent Time 1 (2.5 s)
f- Independent Time 2 (5 s)
g- Independent Time 3 (10 s)
h- Independent Time 4 (15 s)
The instantaneous tripping current, the time multiplication factor, and current-time
characteristics adjustment both for the phases and neutral can be selected
separately.
2. CKR- 8XX series overcurrent protection relays include five different inverse-
time and three different independent time characteristics. According to IEC-255,
BS-142 and ANSI C.112, these are:
a- Normal Inverse
b- Very Inverse
c- Extremely Inverse
d- Long Time Inverse
e- Moderately Inverse
f- Independent Time 1 (2.5 s)
g- Independent Time 2 (5 s)
h- Independent Time 3 (15 s)
The instantaneous tripping current, the time multiplication factor, and current-time
characteristics adjustment both for the phases and neutral are common
1.CKR-91 - CKR 81: Single-phase overcurrent relay with no earth.
This overcurrent relay protects only single-phase. If three-phase protection is
required, three relays should be used. See connection diagram A.
2.CKR-91T - CKR 81T: Earth fault overcurrent relay. This relay measures
the current flowing from the star point to earth. If the line is balanced this current
is zero while the balance is destroyed when one of the phases is connected to
earth. See connection diagram B1 and B2.
Note: See connection diagram B3 for CKR 91T -CKR81T96 96
3.CKR-92T - CKR 82T: T hase and earth fault overcurrent relay. This
overcurrent relay is used to combine the two-phase protection and earth-fault
protection in one device. See connection diagram C.
4. :CKR-93 - CKR 83 Three-phase overcurrent relay. This overcurrent relay
is used to protect the phases with only one relay.
See connection diagram D.
5. CKR-93T - CKR 83T: Three-phase and earth fault overcurrent relay. This
overcurrent relay is used to combine the three-phase protection and earth-fault
protection in one device. See connection diagram E.
Current-Time Characteristics
IA / I
t (s)
1 10 20
I1 (t)-R1
I2
(t)-R2
I3
(t)-R3
I4 (t)-R4
~
I1 = (t) I2 = (t) I3 = (t) I4 = (t)
R1R2R3R4
I4 (t) < I3 (t) < I
2 (t) < I
1 (t) Energy flow
direction
Power
source
1
601090305/01
 ISO 9001 Q.M.S. Certificate
NEW GENERATION OVERCURRENT PROTECTION DEVICES
CKR SERIES
ON:OFF:
CKR-9XX CKR-8XX
NORMAL INVERSE NORMAL INVERSE
VERY INVERSE VERY INVERSE
EXTREMELY INVERSE EXTREMELY INVERSE
LONG TIME INVERSE LONG TIME INVERSE
INDEPENDENT TIME 1 (2.5 s) MODERATELY INVERSE
INDEPENDENT TIME 2 (5 s) INDEPENDENT TIME 1 (2.5 s)
INDEPENDENT TIME 3 (10 s) INDEPENDENT TIME 2 (5 s)
INDEPENDENT TIME 4 (15 s) INDEPENDENT TIME 3 (15 s)
2 3 4
Technical Data
Auxiliary Supply
Rated Voltage (Un) : 24VDC, 110VDC, 220VAC-240VAC*
Operating Range : (0.8-1.2) x Un
Operating Value : I x 1.05 (for dependent time)
(I x 1.01 for ýndependent time)
Time Circuit and Current Adjustments
Time Adjustment : t: (0.05 - 1.0), 11 different time selection
Instantaneous Tripping Time: For I > (1.5 x I>> x Iset )
<100 ms
Rated Current (In) : 5A (phase), 1A (in earth fault)
Overload Current : 3 x In
Delayed Tripping Current: 1-16.75A Phase (0.2-3.35 ) x In
0.2-3.35A Earth (0.2-3.35) x In
Adjustment Tolerance : %7.5 or 40msn
Instantaneous Tripping Adjustment: k x [I>], k:2-17
Contacts
Phase : 1 NO 10A/1400VA (normally open)
Neutral : 1 NO 10A/1400VA (normally open)
Ambient Temperature : -5°C ; +50°C
Insulation omplies with IEC-255: c
a) Between ground and all terminals : 2kV/50 or 60 Hz, 1 min
b) Between current terminal and all terminals : 2kV/50 or 60 Hz, 1 min
High Frequency Disturbance
Non-affected Noise Level: 2.5 and 1kV-1MHz.
RFI : .150 & 450 MHz, 5W transmitter @25cm, all sides
Dimensions : Type PR 17, Type PR 24
Protection Class : IP 51
Installation : Flush-mounting with rear connectors.
Weight : 1.3 kg.(PR 17), 0.6kg (PR 24)
Package Dimensions : 370 x 370 x 200 (PR 17), 360x245x250 (PR 24)
Pcs Per Package : 4 (PR 17), 16 (PR 24)
* Different supply voltages available upon request.
* In CKR-81T ant CKR91T type earth fault relays, there are two operating96 96
voltage inputs; 230VAC and 24VDC. Device operates either at 230VAC or
24VDC.
105
122
140
103
140
140
Dimensions
2
Connection
Diagrams
C-Two Phase and Earth Fault Overcurrent Protection Relay
D-Three Phase Overcurrent Protection Relay
E-Three Phase and Earth Fault Overcurrent Protection Relay
B1- Earth Fault
Overcurrent Protection Relay
ECU
IL
+
+
L3
L2
L1
Ao
Ko
Auxiliary relay
ER-3Y
K
l
k
L
K
l
k
L
K
l
k
L
7
15
14
13
12
11
10
9
8
ECU
IE
IL
+
+
L3
L2
L1
E
A
o
Ko
Auxiliary relay
ER-3Y
K
l
k
L
K
l
k
L
K
l
k
L
7
15
14
13
12
11
10
9
8
1
4
6
5
2
3
1
2
3
4
5
6
ECU
IE
IL
+
+
L2
L1
E
Ao
Ko
Auxiliary relay
ER-3Y
K
l
k
L
K
l
k
L
K
l
k
L
7
15
14
13
12
11
10
9
8
1
4
6
5
2
3
The shown diagrams are only for typical application purposes.
Ao
K
l
k
L
K
l
k
L
K
l
k
L
14
15
1
2
3
4
5
6
IL
+
L3
L2
L1
7
8
9
10
11
12
13
14
15
IE
+
7
8
9
10
11
12
13
1
2
3
4
5
6
ECU ECU
+
Ko
Auxiliary relay
ER-3Y
+
B
2- Earth Fault
Overcurrent Protection Relay
A- Single Phase
Overcurrent Protection Relay
ECU
IL
+
+
L1
Ao
Ko
Auxiliary relay
ER-3Y
K
l
k
L
K
l
k
L
K
l
k
L
7
15
14
13
12
11
10
9
8
1
4
6
5
2
3
ECU
IE
+
+
E
Ao
Ko
Auxiliary relay
ER-3Y
K
l
k
L
K
l
k
L
K
l
k
L
7
15
14
13
12
11
10
9
8
1
4
6
5
2
3
96
96
95
90
70
85
TYPE PR 24TYPE PR 17
B3- Earth Fault Overcurrent Protection Relay
+
E
24VDC
K
l
k
L
K
l
k
L
K
l
k
L
7
9
8
6
3
1
2
5
4
OR
220/230 VAC
ECU
 ISO 9001 Q.M.S. Certificate
601090305/01
L
3L2L1
L
3L
2L1
L
3L
2L
1
L3L2L
1
L
3L2L1
L
3L
2L1
L
3L2L1
NEW GENERATION OVERCURRENT PROTECTION DEVICES
CKR SERIES

Termékspecifikációk

Márka: Entes
Kategória: nincs kategorizálva
Modell: CKR-93T

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