ABB CP Series 지침 리플렛 - 페이지 3

{카테고리_이름} ABB CP Series에 대한 지침 리플렛을 온라인으로 검색하거나 PDF를 다운로드하세요. ABB CP Series 12 페이지. Reverse phase relay

페이지 인쇄

Type 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