ABB CV-26 Folheto de instruções

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Effective: September 1999

Supersedes I.L. 41-201.2E, Dated September 1990

( | ) Denotes Changes since previous issue

CONTENTS

This leaflet applies to the following types

of relays:

• CV-21 Long Time Undervoltage Relay

• CV-22 Short Time Undervoltage Relay

• CV-24 Long Time Overvoltage Relay

• CV-25 Short Time Overvoltage Relay

• CV-26 Long Time Over or Undervoltage

Relay

• CV-27 Short Time Over or Undervoltage

Relay

CAUTION

Before putting relays into service, remove all

blocking which may have been inserted for the

purpose of securing the parts during ship-

ment, make sure that all moving parts operate

freely, inspect the contacts to see that they

are clean and close properly, and operate the

relay to check the settings and electrical con-

nections.

1.0 APPLICATIONS

The type CV relays are single-phase induction-disc

type relays operating either on under or over voltage

or both. These relays frequency compensated such

that their pickup between 30 and 90 Hz is within 5%

of the value at rated frequency.

All possible contingencies which may arise during installation, operation or maintenance, and all details and

variations of this equipment do not purport to be covered by these instructions. If further information is

desired by purchaser regarding this particular installation, operation or maintenance of this equipment, the

local ABB Power T&D Company Inc. representative should be contacted.

ABB Automation Inc

Substation Automation and Protection Division

Coral Springs, FL 33065

Type CV Frequency

Compensated Voltage Relay

2.0 CONSTRUCTION AND OPERATION

The types CV-21, CV-22, CV-24, CV-25, CV-26 and

CV-27 relays consist of a voltage unit, an auxiliary

telephone type relay and an indicating contactor

switch (ICS). The component parts of the relays are

connected as shown in the internal schematic dia-

gram. Some style relays contain an instantaneous

indicating voltage switch (IIV) which also operates

independent of frequency.

2.1

The overvoltage unit is an "E" type laminated struc-

ture with coils on each leg. The coil on the center leg

of the structure is an autotransformer winding with a

tapped primary. The secondary winding of the

autotransformer is connected to identical coils called

lag coils on the outer legs of the "E" type laminated

structure. The coils are connected in such a manner

that the combination of all fluxes produced result in

out-of-phase fluxes in the air gap. The out-of-phase

air gap fluxes produced cause a contact closing

torque.

The undervoltage unit operates on the same princi-

ples as the overvoltage unit except the connections to

the lag coils are reversed to cause the out-of-phase

fluxes to produce a contact opening torque.

The units are frequently compensated by means of a

resistor in the outer coil circuit.

2.2

The instantaneous trip unit is a small ac operated clap-

per type device. A magnetic armature, to which

VOLTAGE UNIT (CV)

INSTANTANEOUS INDICATING VOLTAGE

SWITCH (IIV)

Instruction Leaflet

41-201.2G