參數(shù)資料
型號： H475156230
文件頁數(shù)： 2/2頁
文件大?。?/td> 66K
代理商： H475156230
2
Specifications are subject to change without notice (26.10.99)
H 475
Reaction time
τ
= 0.2 s, worst case reaction
time may be up to 5 x
τ
Indication for
Power supply ON
Output ON
Environment
Degree of protection
Pollution degree
Operating temperature
Storage temperature
Weight
LED, green
LED, red
(IEC 60947-1)
IP 20 B/front IP40 D (IEC 60529)
3 (IEC 60664)
-20° to +50°C (-4° to +122°F)
-50° to +85°C (-58° to +185°F)
300 g
The relay requiring 2-phased
power supply is used with
one of the 3-phased current
metering transformers, types
A 74-10 5, A 74-10 20, A 74-
11 100, A 74-11 500. When
the supply voltage is applied
the relay operates, provided
the current flowing in all 3-
phase cables exceeds the
minimum current of the trans-
formers and phase cables
must be drawn through the
transformer from the same
side.
Mode of Operation
When the power supply is
applied the relay operates
when all 3-phase currents are
within the set levels, and re-
leases when one or more
phase-phase currents ex-
ceed the upper set level or
drop below the set level. The
relay operates again when all
3-phase currents are within
the set levels. Hysteresis on
operate is approx. 2%. The
phase sequence through the
current metering transformer
is arbitrary.
Wiring Diagram
Measuring range
3-phased current metering
transformers measure in the
following 4 ranges:
A 74-10 5 = 0.5- 5 A
A 74-10 20 = 2 - 20 A
A 74-11 100 = 10 - 100 A
A 74-11 500 = 50 - 500 A
Range setting
Left potentiometer:
Lower limit. From 8 to 98% of
nominal max. value for the
current metering transformer
employed.
Range Setting
Right potentiometer:
Upper limit. From 10 to 100%
of nominal max. value for the
current transformer em
ployed.
If the lower limit is set above
the upper limit, the output re-
lay releases and cannot be
activated before the lower limit
is set lower than the upper
limit.
Hysteresis
Max. limit: - 2%
Min. limit: + 2%
Accessories
Current metering transformers
A 74-10 5
A 74-10 20
A 74-11 100
A 74-11 500
For further information refer to "Current Metering Transfor-
mers".
Upper limit
Hysteresis
Lower limit
Hysteresis
Relay ON
L1, L2, L3
Operation Diagram
Power supply
H 475
PE = term 8
μ
Term. 5: Red core
Term. 6: White core
Term. 7: Yellow core
Term. 8: Black core
General Specifications
相關PDF資料
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