Table 3 - Output Relay Types; Communication Interface - Siemens 7SG11 Technical Manual

Argus 8

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Manual (241 pages)

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Table of Contents

Hardware Description

2.1 General

All of the Argus range of relays share common hardware components and modules. The design for the

mechanical arrangement of the relays has been carefully chosen to provide a high level of EMI

screening using multi-layer PCB's with ground planes, RFI suppression components and earthed

metal screens. The internal arrangement has been divided into noisy and quiet areas in order to

improve noise immunity and reduce RFI emissions. The only direct connection from the quiet

components to the external environment is via the optical serial communications interface, which is

immune to radiated or conducted interference.

2.2 Analogue Inputs

The input stage of an Argus 8 relay measures either two or three voltage quantities depending upon the particular

variant. Over the range of 5 Vrms to 200 Vrms it maintains accuracy within ±1% (or 0.25V) over the declared

frequency performance range. The wide measuring range of the input stage allows for either phase-phase or

phase-neutral connections e.g. 110Vrms or 63.5Vrms nominal voltages.

Note : on relay variants which have a 2Ph-Ph connection setting, the 3

two known phases if the external connection is connected phase-phase.

In order to ensure high accuracy voltage, frequency and sequence component calculations the voltage

signals are sampled at 32 samples per cycle for both 50Hz and 60Hz system frequencies. The high

sampling rate provides high accuracy and quality waveform storage records, which are stored at a rate

of 16 samples per cycle.

2.3 Output Relays

Argus 8 relays have a variety of output contact types available depending upon the case size and expansion card

option. The full range is given in Table 3.

Catalogue Number

AG8 101-103

AG8 201-203

AG8 301-303

AG8 104-106

AG8 204-206

AG8 304-306

AG8 107-109

AG8 207-209

AG8 307-309

AG8 110-112

AG8 210-212

AG8 310-312

All output relays are fully user configurable and can be programmed to operate from any or all of the protection

functions. In addition, a watchdog feature within the relay can be mapped to any of the output relays. A

changeover or normally-closed contact is generally required for this.

All output relays are of the same design and therefore each is capable of handling direct circuit breaker-tripping

duty.

Output relays can be set to remain energised for a minimum time of between 100-500msec. If required, however,

outputs can be programmed to operate as latching relays. These latched outputs can be reset by either pressing

the TEST/RESET button, by energising a status input or by sending an appropriate communications command.

A trip test feature is provided to exercise the output contacts.

For a list of terminal numbers and their usage see Tables 4 and 5 at the back of this section.

Output Relays Available

C/O Contact