KCEG142 Ver la hoja de datos (PDF) - Unspecified

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componentes Descripción

Fabricante

KCEG142

Overcurrent Protection

Unspecified 

Fault records

The last five faults are recorded by the

relay. They include:

q fault flags

q currents

q voltages (where measured)

q circuit breaker operation time

Event records

Fifty events are stored in a buffer.

Software is available to enable the

events to be downloaded to a PC.

An event record is logged following a

change of state of a control input or

output relay, local setting change, or

operation of a control function.

Records are time tagged to a

resolution of 1ms. Fault records and

alarms are also stored as events.

Disturbance records

The internal disturbance recorder has

up to 7 analogue, 16 digital and 1

time channel (depending on the model

selected). The recorder can be

triggered from any relay output and/

or digital input, and can store one

complete record. Data is sampled 8

times per cycle and each channel can

store up to 512 samples. Software is

available to allow records to be

accessed and displayed by a PC.

Test Features

A number of features are provided to

enable the relay to be thoroughly

tested during commissioning, routine

maintenance and fault finding

operations:

q Power-on diagnostics

q Continuous self monitoring

q The verification of input quantities

by the measurement functions

q The on/off states of the digital

inputs and relay outputs can be

displayed

Hardware Description

KCGG and KCEG relays are housed

in Midos modular cases, suitable for

either rack or panel mounting as

shown in Figures 13, 14 and 15.

The relays can have up to 4 CT and

up to 3 VT analogue inputs. They

provide 3 or 8 optically isolated

inputs and 4 or 8 programmable

outputs depending on the model

selected, together with a dedicated

watchdog relay.

The front panel contains a 2 x 16

character alphanumeric back-lit liquid

crystal display (LCD). The back-light is

activated when the keypad is touched

and will automatically switch off,

conserving power, after 15 minutes of

keypad inactivity. Four push-buttons

provide local access to the relay’s

menu. There are also 3 light emitting

diodes (LED) for visual indication of

the relay’s status, ie. relay healthy,

trip, alarm.

Standard Midos terminal blocks are

located at the rear of the relay

providing connections for all input

and output circuits. Each terminal will

accept up to two connections using

either; an ‘L’ shaped ring connector

fastened with a 4mm diameter (M4)

screw or; a snap-on connector

compliant with BS5057 or equivalent.

User Interface

Front panel user interface

The features of the relay can be

accessed through a menu driven

system. The menu is arranged in the

form of a table, into each column of

which, related items (menu cells) are

grouped.

The front panel LCD displays one

menu cell at a time. The complete

menu system can be traversed with

the relay’s front cover in place by

using the ‘F’ key. Easier access can

be made with the cover off by using

the ‘+’ and ‘-’ keys, which are also

used to change the relay settings.

Remote access user interface

The menu table can also be accessed

via the remote communications

facility. This allows all of the menu

cells in a column to be displayed

simultaneously on the screen of a PC.

Changes to a menu cell can be made

from the PC keyboard.

Serial communication

The relays are interconnected via a

shielded, twisted wire pair known as

K-Bus. Up to 32 relays may be

connected in parallel across the bus.

The K-Bus is connected through a

protocol converter known as KITZ,

either directly or via a modem, to the

RS232 port of the PC. The KITZ

provides signals over the bus which

are RS485 based and are transmitted

at 64kbits/s. The K-Bus connection is

shown in Figure 5.

This system allows up to 32 relays to

be accessed through one RS232

communications port. A pictorial

representation of this is shown in

Figure 4.

Software is available with each KITZ

to provide access to the relay to read

and change settings. Additional

software entitled ‘Protection Access

Software & Toolkit’ is available. This

provides access to the event recorder

and other additional functions.

Each relay is directly addressable

over the bus to allow communication

with any selected relay. Global

commands may also be given to all

relays on the network.

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