I
O N M A N U A L
C U R R E N T R E L A Y
C O R P O R A T I O N
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CONTENTS
G e n e r a l
1 .
2 .
2
2
2
C h e c k B e f o r e U s i n g
E x t e r n a l
2 . 1
2 . 2
S p e c i f i c a t i o n s
3
5
6
6
3 .
o
f
4.1
4.2
b.3
4.4
4.5
O v e r c u r r e n t D e t e c t i o n o n H o t o r s - - - - - - - - - - - - - - - - - - - - - - -
U n d e r c u r r e n t D e t e c t i o n o n M o t o r s - - - - - - - - - - - - - - - - - - - - - -
L i m i t i n g S t a r t i n g C u r r e n t o f R o t o r s - - - - - - - - - - - - - - - - - - -
Transformers
.
H e a t e r s ,
a n d O t h e r C i r c u i t s - - - - - - - - - - - - - - - - - - - - -
5 .
6 .
A d j u s t a e n t s - - - - - - - - - -
1 2
1 2
1 2
1 3
1 3
1 7
6 . 1
6 . 2
6 . 3
S e t t i n g t h e D e t e c t i o n D e l a y
S e t t i n g t h e R e s p o n s e D e l a y
l e s t
- - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - -
7 .
8 .
_ - _ - m - m m - - - - _ _ _ _ - _ _ - _ _ - _ _ - - _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
C o v e r
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Please thoroughly read this instruction
Current Relay.
before using the
1. General
This current relay is designed to detect current in AC circuits
with a wide range of
detection of abnoraai
due to overloads or broken
current of
circuits
electrical
heater circuits), detection of starting current to
autoaaticaiiy advance the secondary resistance on induction wound
rotor motor controllers.
During starting, excessive current such as inrush current,
exceed rated current flow in motor
transforaer circuits. this
current relay has an adjustable delay circuit to prevent it
operating during start-up.
Further, this current
at the control Dower is applied. and the relay is
exceeds the level or control
is fail safe. The relay
energized when the
Dower is removed.
2. Check Before Using
Before
this relay. check the following Doints. If any
defects are found, contact the dealer
which you purchased this
relay.
2.1 External
Check the relay for any missing Darts and for damage, dirt,
rust, and loosened caused during transportation.
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T O S H I B A
2.2 Specifications
SPECIFICATIDHS
(continuous)
Rated Current
0.5
(For current above this range, use a
Range of current
sensing
CT (current transforrer) and connect the
relay to its secondary side).
low voltage circuit (below AC
c i r c u i t
voltage
To detect current in high voltage circuits,
use a CT, and connect the relay
secondary side.
its
Undercurrent
Overcurrent,
of Current
3s
0.1
delay
time-adjustable
range
0.1 30s
Detection delay
tile-adjustable
range
132VAC.
a 5
Operating volt.
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Inductive load
Break
Continuous
120
240
24
AC
Rating
AC
3 A
Designation
B300
DC 120
240
5 A
5 A
ITEH
SPECIFICATIONS
Hysteresis
10X of
value.
Power consumption
Power
Circuit
(when 5A is
Height
( 1 . 7
3 .
o f
When the detected current exceeds the detection circuit
operating level, the detection delay timer is actuated. If
current is continuously detected for more then the detection delay
time set value, the overcurrent response delay timer is actuated.
Then, if overcurrent is detected when the
elapsed, the overcurrent relay is actuated.
delay timer has
If current drops below the undercurrent detection set
delay timer is actuated, and after the set tile has
the undercurrent detection relay is actuated. In the case
the
of undercurrent detection, the detection delay timer is not actuated.
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Detection delay
level
0
Undercurrent detect
1 Characteristics
4.1 Overcurrent Detection on
An
Is shown in
2. In this
an excessive load is detected by detecting the overcurrent of a
and the is to Protect
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the
being damaged.
and in case of a high voltage circuit, use an external CT and
If the detected current is above
connect the secondary side of CT to the relay as shown in the
following figure:
Power
23
I
I
Current relay
T h e
contacts are shown
with Dower source
2
using An External CT
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T O S H I B A
further, when this relay is used in a
detection delay should be set
circuit, the
than the startinv
time (about 120%) so that this relay is not actuated by inrush
If current flowinp in the
circuit
abnormal
current.
after the
Deriod of the detection delay timer has
the relay is actuated when the set
is over.
of the response delay
4.2 Undercurrent Detection on
To utilize the undercurrent detection function, the
is used in a circuit with a fixed load, to detect livht
For in the case of a
or no load conditions.
this relay is used to detect undercurrent when the
water in a water is low, or in case of a thread
Of
winding rachine, when the tension of the thread
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Current relay
Note: The
contacts are shown
with Dower source
Fig. 3 Application
4.3
Startino current of
Many
of
and large capacity use a
to
start by limiting starting current.
detectino the
circuit current, this relay can automatically advance the
starting resistance on the secondary side of the motor (in this
case, the knob of the detection delay timar and that of the
delay timer should be kept at the minimum
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4 . 4
To use this current relay for detecting overcurrent on
it is necessary to set the detection delay
with the inrush current of
taken into consideration.
4.5 Heaters,
This relay can be used to detect the disconnection of
circuits by sensing the existence of current flow.
words, if disconnection occurs, current does not flow and an
undercurrent condition is detected by the relay.
this relay can be used to detect the disconnection of heater
circuits on constant ovens or heatar circuits for
and other Circuits
In other
For
insulators on transmission and distribution facilities In
extremely cold regions.
5. Hount ing
See Fig. 4 for uounting dieensions. Be careful not to use this
relay in the following conditions:
Locations in aebient
outside -10
Locations
to high
or dripping water,
Dusty/dirty locations,
subject to vibration
amplitude
or
20
or and shock (above
in 3 directions).
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50
Hole
Hountino holes
Fig. 4 Dimensions
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T O S H I B A
6 .
6.1 Current setting
(1) When detected current is in a range of 0.5
After confirming that the current value under
load
condition is in a range of 0.5
set the current
adjusting knob to the desired detecting value.
When detected current is above
Using an external CT (current transformer),
suited
for the detected Current value, connect the secondary side of
the CT to the
of the relay. Calculate the
to the detected current
secondary current
value, based on the CT ratio. Then set the current adjusting
Knob to this calculated value.
6.2 Setting the detection delay
Setting time varies depending
each individual
Adjust the detection delay
according to the following:
load
TO avoid detection during start-up, set the delay tire to
120% of starting
load
(2)
If the inrush current (inrush time varies
is large, set the delay
120% of this inrush
inrush is short and therefore, even when the
to
the
is
adjusting knob is set at the
not be any nuisance tripping.
position. there should
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6.3 Setting the
Adjust the set
delay
according to the
of detection (I.e.
overcurrent or undercurrent). The set tire for the
delay varies ger
any delay
Host applications
not need
It is
used to prevent nuisance
load
(ride through) by ignoring
7 .
l e s t
Check both the control and detection circuits to confirm there
is no
(2) Check if the current
delay settings are correct.
If the wiring ard settings are correct, energize the control
circuit and check if it is the voltage.
delay, and
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(4) When the Dower source is
the input signal end the
the relay is excited and the
between
Table 2.
contact’s states are reversed. The
contacts are shown
Check this relationship during the test.
Table 2
is found when the Dower source is
the rain circuit switch ON and the following checks:
If no
turn
In the case of a motor load
If the set delay is too short, the relay
be actuated. In such a case, reset the detection delay
adjusting knob accordingly. After the start-up delay
has
apply current above the set detection value
that the relay functions (after the
to
delay
indicating
In addition, check that the detection
lights at the
time the relay
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T O S H I B A
When undercurrent or disconnection is detected
At the time the circuit switch is turned
starting current and rated current flows, and the relay is
picked UP. If current below the undercurrent set point,
the
the undercurrent State is detected and the relay
(Refer to Fig. 5)
out.
If input signal to this current relay is zero (When
Caution:
it is not possible to judge if it is undercurrent or in a
disconnected state. In this case, it is recommended to
have a circuit connecting a
tact of the circuit switch in series with the
circuit. this will Drevent the relay fror
fault condition during a shutdown.
auxiliary con-
or
a
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(6) If the relay does not operate in the above test, check if
the current setting is correct or if the
above the set detection value.
signal is
signal is
If the
correct, check the operation of the relay by gradually
reducing the setting of the current adjusting knob.
If the
relay still does not
please contact the dealer
or Toshiba.
it is defective.
In this case,
which you purchased the relay
Power Source
Detected current
Overcurrent
detect ion
T3
Undercurrant
detect ion
I
Detection delay tire
T2: Overcurrent detecting resgonse delay
T3: Undercurrent detecting resgonse delay
Fig. Relay Operation
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T O S H I B A
8. Cover
To adjust the current and
the cover by
as shown below. To replace the cover,
cover in the out oreventive hole and then insert the bosses
of the cover into the 2 holes at the left and right.
settings the cover
a force in the direction of the arrow
the projection of the
be raaoved.
Cover
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T O S H I B A C O R P O R A T I O N
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