Single-phase current measuring relay series IOw10 - RELKO

AC Current Measuring
Relay - Self-Supplied
Series IOw 10 / 20
1 Overview
Device Type Overcurrent High Set Current Timer Frequency Measurement Drop Indicator / Adjustment
I> I>> t fn Ranges LED 64 steps steady
IOw 10 X – – 50 (60) X – / X – X
IOw 20 X – – 50 (60) X X / – X –
IOw 20z X – X 50 (60) X X / – I> t
IIw 20 X X – 50 (60) X X / – I> I>>
2 Application
These single-phase a.c. current measuring
relays are available as overcurrent
or overcurrent-time relays as well
as two-stage current relay (I> and I>>).
They are used for power system protection
and supervision-tasks.
The measurement of high current
shorts is possible.
On the basis of their particular qualities,
the substitute of electro-mechanical current
measuring relays is easily realizable
(e.g. EAW-device RSf 5).
They are designed for non-delayed or
delayed tripping of circuit breakers or
contactors and for the operation of actuating
and controlling elements in the
event of any exceeding of the set current
value.
Looped into secondary transformer circuits
they can monitor the primary variables
of any power networks on all voltage
levels. Direct connection to circuits
with a nominal voltage of up to 250 V is
possible.
The IIw 20 offers a two-stage current
characteristic by the integrated highset-stage.
That enables an increase of
selectivity with protective grading.
No additional supply is needed for
these measuring relays to work; they
are supplied from the measuring circuit.
Operate and release times have been
kept very short and their power consumption
is low.
Individual devices can be combined at
will for multi-phase applications.
For relays used on sea-going vessels,
please enquire.
3 Highlights
• High limiting current-loading capacity
in this relay series,
• Measurement range changeover
facility (1:2),
• Short operate and release times,
• High accuracy,
• Suppression of harmonics and transient
current peaks or dips,
• Models with adjustment in 64 steps
have high setting accuracy,
• Relay type IIw20 has a separate
output relay for I> (11, 12, 14) and
I>> (21, 22, 24),
• Drop indicator is available
• Low power consumption from
measuring circuit.
4 Function
All appliances possess a currenttransformer
that has the task of auxiliary
voltage generation as well as providing
thermal and dynamic loading capacity
beside the galvanic separation.
Connecting primary windings in series -
or parallel-circuit can choose the meas-
I
I>> an
I>> ab
I> an
I> ab
1
0
1
0
Behavior of the output relay
Function (without consideration of a time stage)
uring range.
With the types IOw 10 and IOw 20 the
contact of the output relay is closed with
exceeding of the setting value.
Same happens delayed with the overcurrent-time
relay IOw 20z. When current
falls below the operate value multiplied
by the resetting ratio, before the
adjusted time has run out, so the timestage
is reset and the output relay stays
off. The adjustment of the timer is done
by a potentiometer.
The setting of the operate value on
measuring relays IOw 20(z) and IIw 20
take place by means of DIL - switches
in fine gradation. The setting accuracy
is high so no calibration is necessary in
most cases.
A red/white hand-reset drop indicator
signals tripping of the relay. It is thus
possible, even in the off-circuit state to
determine which relay was started.
Relay IOw 10, on the other hand, has a
LED to signal that the output relay has
responded.
Operate value I>>
Release value I>>
Operate value I>
Release value I>
IOw10, IOw20(z), IIw20 02/03 1 EAW Relaistechnik GmbH
I>
I>> (only IIw20)
t

A sealing cap is available.
5 Specifications
The relay satisfies the requirements of the
product standards IEC EN 60255-6, DIN
57435, part 303 and EMC standards EN
50082-2 and EN 50081-2
Permissible ambient conditions
- Operating temperature -25°C...+50°C
>20 mm clearance on all sides
-25°C...+60°C
- Storage temperature -25°C...+60°C
- Transport temperature -30°C...+70°C
- relative humidity (IEC 60068-2-3)
for 30 days 93% at , t I> I>>
Rated current In /A According to the variant: 1, 2.5, 5 or 10
Setting range 1: 1
(0.8... at least 1.6⋅In)
Setting range 2: 2
(1.6... at least 3.2⋅In)
In=1 A
In=2.5 A
In=5 A
In=10 A
In=1 A
In=2.5 A
In=5 A
In=10 A
0.8...1.6 A
2...4 A
4...8 A
8...16 A
1.6...3.2 A
4...8 A
8...16 A
16...32 A
0.8...2.06 A
2...5.15 A
4...10.3 A
8...20.6 A
1.6...4.12 A
4...10.3 A
8...20.6 A
16...41.2 A
4...10 A
10...25 A
20...50 A
40...100 A
8...20 A
20... 50 A
40...100 A
80...200 A
Mode of adjustment steady in 64 steps with 2% of In steady
Accuracy class 5 2.5 10
Repeat accuracy ≤ 1% ≤ 5%
Resetting ratio ≥ 0.9 ≥ 0.8
Load capability permanent 2⋅In, windings parallel 2 : 4⋅In, max. 25 A
Load capability for 1 s 100⋅In, max. 500 A
Limiting dynamic value (10 ms) 250⋅In, max. 1250 A
Rated frequency (frequency range) 50 / 60 Hz (47...65 Hz)
Operate time /ms ≤ 30 ≤ 30 - ≤ 30 ≤ 30
Tripping time: 3 I starting from 0 A
- - ≤ 250 ms +t - -
I from 0,4⋅In
≤ 30 ms +t
Release time /ms ≤ 30
Influence of temperature variation ≤ 0.1 %/K
Influence of frequency variation ≤ 0.1 %/%f
Power consumption at In ; relay on
≤ 1.6 VA
≤ 1.9 VA
≤ 1.6 VA
relay off
≤ 1.2 VA
≤ 1.5 VA
≤ 1.2 VA
1 Terminal connection at K1 - L2, L1 is connected with K2
2 Terminal connection at K1, K2 - L1, L2
3 applies to devices with time stage, t is the adjusted time; current jump to 2In
IOw10, IOw20(z), IIw20 02/03 2 EAW Relaistechnik GmbH

Timer module of the IOw 20z
Pl.-No. 1772 0xx 1xx Pl.-No. 1772 0xx 2xx
Time range < 50 ms up to 3 s < 60 ms up to 10 s
Repeat accuracy 0.1 %, ± 5 ms 0.1 %, ± 5 ms
Adjustment accuracy ≤ 20 %, ± 100 ms ≤ 20 %, ± 300 ms
Recovery time ≤ 20 ms ≤ 20 ms
Influence of temperature variation ≤ 0.1 % / K ≤ 0.1 % / K
6 Order data
Note: Relays with a timer module have a “z” in the model number.
IOw 10
I> /A, terminal selectable In /A Pl-No:
0.8 ... 1.6 / 1.6 ... 3.2 1 1772 083 000
2 ... 4 / 4 ... 8 2.5 1772 084 000
4 ... 8 / 8 ... 16 5 1772 085 000
8 ... 16 / 16 ... 32 10 1772 086 000
IOw 20, IOw 20z
I> /A, terminal selectable In /A IOw 20 IOw 20z, 3 s IOw 20z, 10 s
0.8 ... 2.06 / 1.6 ... 4.12 1 1772 088 000 1772 093 100 1772 093 200
2 ... 5.15 / 4 ... 10.3 2.5 1772 089 000 1772 094 100 1772 094 200
4 ... 10.3 / 8 ... 20.6 5 1772 090 000 1772 095 100 1772 095 200
8 ... 20.6 / 16 ... 41.2 10 1772 091 000 1772 096 100 1772 096 200
IIw 20
I> /A, terminal selectable I>> /A, terminal selectable In /A Pl-No:
0.8 ... 2.06 / 1.6 ... 4.12 4 ... 10 / 8 ... 20 1 1772 093 000
2 ... 5.15 / 4 ... 10.3 10 ... 25 / 20 ... 50 2.5 1772 094 000
4 ... 10.3 / 8 ... 20.6 20 ... 50 / 40 ... 100 5 1772 095 000
8 ... 20.6 / 16 ... 41.2 40 ... 100 / 80 ... 200 10 1772 096 000
7 Terminal diagrams and dimensions
11 K1 L1 K2 L2
K1
12 14
K2
1·I meas
I>
11
12 14
L1
11 K1 L1 K2 L2 21
K1
11
12 14
K2
1·I meas
I>
I>>
12 14 22 24
21
22 24
L1
L2
L2
2·I meas
K1 L1 K2 L2
IOw 10
IOw 20
2·I meas
K1 L1 K2 L2
IIw 20
1 5 K1 L1 K2 L2
16 18
IOw10, IOw20(z), IIw20 02/03 3 EAW Relaistechnik GmbH
K1
K2
1·I meas
I>
Connection diagrams
L1
L2
15
16 18
2·I meas
K1 L1 K2 L2
IOw 20z

View without sealing cap
Sealing cap for IOw20z, IIw20
Dimensions (represented high sealing cap only at variants with the time or high set current stage)
Rail
EN 50022-35
Drilling for screws M4
or
Note:
Single-phase AC current measuring relays, which have low consumption in the measuring circuit but need an auxiliary voltage, are
available with the IOw70 – series.
Inquiries: EAW Relaistechnik GmbH Telephone: +49 (30) 55762 - 200
Hauptstr. 13 Fax: +49 (30) 55762 - 203
D - 10317 Berlin Internet: http://www.eaw-relaistechnik.de
Email: vertrieb@eaw-relaistechnik.de
IOw10, IOw20(z), IIw20 02/03 4 EAW Relaistechnik GmbH