ABB CP Series Ulotka z instrukcją - Strona 3
Przeglądaj online lub pobierz pdf Ulotka z instrukcją dla Przekaźniki ABB CP Series. ABB CP Series 12 stron. Reverse phase relay
Drukuj stronęType CP Reverse Phase Relay
Fig. 3.
Internal Schematic of the Type CP Relay in the
Type FT-11 Case.
cient to reduce the relay torque to its low voltage trip
point.
B. INDICATING CONTACTOR SWITCH (ICS)
The indicating contactor switch is a small d-c oper-
ated clapper type device. A magnetic armature, to
which leafspring mounted contacts are attached, is
attracted to the magnetic core upon energization of
the switch. When the switch closes, the moving con-
tacts bridge two stationary contacts, completing the
trip circuit. Also, during this operation two fingers on
the armature deflect a spring located on the front of
the switch, which allows the operation indicator
target to drop. The target is reset from the outside of
the case by a push rod located at the bottom of the
case.
The front spring, in addition to holding the target, pro-
vides restraint for the armature and thus controls the
pickup value of the switch.
An ac indicating contact switch (ACS) is used where
the relay contacts connect to an ac trip or control cir-
cuit.
C. INDICATING VOLTAGE SWITCH (IVS)
The indicating voltage switch has the same construc-
tion as the indicating contactor switch.
Sub 1
183A962
Fig. 4.
Internal Schematic of the Type CP Relay with
Indicating Contactor Switch in the Low Voltage
Circuit in the Type FT-11 Case.
3.0 CHARACTERISTICS
The type CF relay has adjustable high and low
voltage contacts which can be set around the periph-
ery of a scale. The ranges of adjustment of the con-
tacts are as follows:
120 volt relay - - - - - - - - - - - - - - - - - - 70 to 120 volts
240 volt relay - - - - - - - - - - - - - - - - - 140 to 240 volts
480 volt relay - - - - - - - - - - - - - - - - - 280 to 480 volts
208 volt relay - - - - - - - - - - - - - - - - - 120 to 220 volts
If either of the adjustable contacts are set for a value
of voltage within these ranges, the relay will just
close its contacts when the balanced three phase
line to line voltages equal this value. For such a con-
dition, the relay is operating at its minimum trip point,
and the operating times on repeated operations are
not repetitive within close tolerances. However, volt-
ages greater than the overvoltage setting or less than
the undervoltage setting, result in relay timing opera-
tions which are consistent for repeated trials.
The relay has inverse timing; that is, the greater the
increase in voltage the faster the relay contacts will
close. Typical time curves for various contact set-
tings are shown in Figs. 6 and 7.
TRIP CIRCUIT
The main contacts will close 30 amperes at 250 volts
d-c and the seal-in contacts of the indicating contac-
41-222.2J
Sub 1
183A960
3