ABB CP Series 지침 리플렛 - 페이지 4

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

페이지 인쇄

41-222.2J

Fig. 5.

Internal Schematic of the Type CP Relay with Indi-

cating Contactor Switch in the High Voltage Circuit

in the Type FT-11 Case.

tor switch (when supplied) will carry this current long

enough to trip a circuit breaker.

The indicating contactor switch (when supplied) has

two taps that provide a pickup setting of 0.2 or 2

amperes. To change taps requires connecting the

lead located in front of the tap block to the desired

setting by means of a screw connection.

TRIP CIRCUIT CONSTANT

Indicating contactor switch (ICS) (When Supplied).

0.2 ampere tap - - - - - - - 6.5 ohms d-c resistance

2.0 ampere tap - - - - - - 0.15 ohms d-c resistance

INDICATING VOLTAGE SWITCH (IVS)

The indicating voltage switch (IVS) has a series

resistor. The IVS will operate when 80% d-c rated

voltage is applied to the IVS circuitry.

4.0 INSTALLATION

The relays should be mounted on switchboardsepa-

rated to allow for a minimum contact gap of panels or

their equivalent in a location free from dirt, moisture,

excessive vibration and heat.

Mount the relay vertically by means of the rear

mounting stud or studs for the type FT projection

case or by means of the four mounting holes on the

flange for the semi-flush type FT case. Either the

stud or the mounting screws may be utilized for

grounding the relay. External toothed washers are

provided for use in the locations shown on the outline

and drilling plan to facilitate making a good electrical

connection between the relay case, its mounting

screws or studs, and the relay panel. Ground wires

should be affixed to the mounting screws or studs as

required for poorly grounded or insulating panels.

Other electrical connections may be made directly to

the terminals by means of screws for steel panel

mounting or to the terminal stud furnished with the

relay for thick panel mounting. The terminal stud may

be easily removed or inserted by locking two nuts on

Sub 1

the stud and then turning the proper nut with a

183A961

wrench.

For detail information on the FT case refer to Instruc-

tion Leaflet 41-076.

5.0 SETTINGS

There are two independent relay adjustments. These

are the high and low voltage contact settings as

described under "Characteristics". These settings

determine the balanced three phase line-to-line

voltage at which the relay contacts trip. The relay

timing is not an independent adjustment, since it is

fixed by the contact settings chosen. Typical time

curves for various contact settings are given in Figs.

6 and 7.

For motor protection set the low-voltage contact at

the minimum permissible operating voltage. (This

contact may also close when the motor is operated

single-phased, provided the open phase voltage is

(WHEN SUPPLIED)

not held too close to normal by the motor. A motor

operating near full load or a motor connected in par-

allel with substantial static load will not be able to

maintain near normal open-phase voltage.) Where

the high voltage contact supervises supply breaker

closing, it must be set lower than normal voltage. For

example, set the high-voltage contact at 90% and the

low-voltage contact at 80% of rated voltage. The high

and low-voltage contacts must be sufficiently sepa-

rated to allow for a minimum contact gap of about

0.020 inch. This corresponds to a voltage setting

separation of about 7%.

Type CP Reverse Phase Relay