ABB CV-1 Folheto de instruções

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Effective:

January 1997

Supersedes I.L. 41-201R, Dated April 1995

( | )

Denotes Change Since Previous Issu

This instruction leaflet applies to the following

types of relay:

CV-1 Long Time Undervoltage Relay

CV-2 Short Time Undervoltage Relay

CV-4 Long Time Overvoltage Relay

CV-5 Short Time Overvoltage Relay

CV-6 Long Time Over or Undervoltage Relay

CV-7 Short Time Over or Undervoltage Relay

CV-8 Low Voltage Pickup Overvoltage 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.

APPLICATION

The Type CV Relays are single-phase induction disc

type relays operating either on under or overvoltage

or both. These relays are applied as a voltage fault

detector operating in conjunction with other protec-

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.

Printed in U.S.A.

ABB Power T&D Company Inc.

Power Automation and Protection Division

Coral Springs, FL 33065

tive relays. The relays are also used as timing

devices for various automatic operations.

The types CV-1, CV-2 CV-4, CV-5, CV-6, and CV-7

relays consist of a voltage unit and an indicating con-

tactor switch (ICS). The principal component parts of

the relay and their location are shown in Figures 1, 2,

and 3.

The Type CV-8 relay in addition to the above compo-

nents also has a capacitor which is series tuned with

the main coil of the electromagnet. This tuned circuit

offers a low impedance to fundamental current and a

high impedance to third harmonic currents. Hence,

the relay has a low pickup value for fundamental volt-

age and a much higher value of pickup for third har-

monic voltage. At rated voltage the electromagnet is

saturated causing the circuit to be detuned. The

impedance of the circuit is increased and limits the

fundamental current to a safe value.

2.1. Voltage Unit (CV)

The overvoltage unit operates on the induction disc

principle. A main tapped coil located on the center

leg of an "E" type laminated structure produces a flux

which divides and returns through the outer legs. A

shading coil causes the flux through the left leg (front

view) to lag the main pole flux. The out-of-phase

fluxes thus produced in the air gap causes a contact

closing torque.

The undervoltage unit operates on the same princi-

ple as the overvoltage unit except the shading coil is

on the right leg (front view). This causes the out-of-

phase fluxes to produce a contact opening torque.

Type CV

Voltage Relay

CONSTRUCTION AND OPERATION

Instruction Leaflet

I.L. 41-201S