GE IRT51 E, Инструкция по эксплуатации, Страница: 7 / 51

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,.
GEK-86038
It is impo rtant to note that these type IRT relays detect actual tempe ratu re , not
rise above ambient . The temperatu re setting sho uld be made on the basis of long term
trends in ambient tempe ratu re .
RATINGS
The o pe rating unit of the type IRT relays has a center tapped coil that permits
o peration at eithe r 1 20 o r 240 volts AC* . Fo r 24 0 val t o pe ration , the two o perating
coils must be connected in series . For 1 20 volt o pe ration , the two o pe rating coils
must be connected in parallel . See Fig u res 1 0 , 1 1 and 12 fo r the AC powe r source
connections . The IRT5 1E and IRT5 1F models have an internal , ins ulated standoff post
fo r making the series connection , while the IRT5 1 G and IRT5 1 H model s bring all of
the o perating coil leads to sepa rate terminals external to the relay . The IRT5 1 E
and IRT5 1F models are shipped from the facto ry connected .fo r 240 volt o pe ration .
*
Some models of the IRT5 1 F
(
-
)
A relay a re rated at 1 10/220 VAC o r DC . See
Table I .
The type IRT relays are suitable fo r o peration on 5 0 hertz and 6 0 hertz powe r
systems .
The type IRT relays are designed fo r use with the following specific type
resistance temperatu re detectors: ..
a . 1 0 ohms at 250C copper RTDs
b . 1 0 0 ohms at ooc planinum RTDs
c . 1 20 ohm at ooc nickel RTDs
Use only the specific RTD for which the particula r model IRT was designed .
The IRT5 1 E , IRT5 1 G and IRT5 1 H relays are fu rnished with a target and seal-in
unit having taps for 0 . 2 amps DC and 2 . 0 am ps DC o peration . Table 2 show s the
different ratings based on tap settings .
TABLE 2
TARGET SEAL-IN UNIT RATINGS
TAP
I
+0%
Minimum DC o perating cu rrent_25%
!
I
DC re sistance +10%
!
T ripping duty -
i
Carry 30 amps
i
Carry 1 0 amps
/
Carry cent i nuous
Contact cu rrent c
1 os i ng rating
(
ohms
)
(
amps
)
(
seconds
)
(
second s
)
(
amps
)
(
amps
)
(
volt s Max.
)
0 . 2 2 . 0
0.2
2 . 0
7 . 0 0 . 1 3
5 . 0
30 . 0
0 . 03 4 .0
0 . 2 5 30 . 0
0 . 3 3 . 0
30 30
250
25 0
The tap setting u sed on the seal-in units is determined by the cu rrent d rawn by
the trip circuit . The 0 . 2 amp tap is for use with trip circuits that o pe rate on
6
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