Black Box IC109A-R2 Instalační manuál stáhnout pdf (Strana 124)

118

Commissioning

Principles

DANGER

Protection Relay Testing

Protection relays are tested prior to commissioning. The twofold goal of these tests

is to maximize availability and minimize the risk of commissioning a malfunctioning

assembly. Since the relay under test is always the main link in the protection chain,

defining the consistency of the appropriate tests is an ongoing challenge.

Since performance is not perfectly reproducable, protection relays based on

electromechanical and static technologies are systematically submitted to detailed

testing for three reasons:

b to qualify relay commissioning

b to check that they actually are in good operating order

b to maintain the required level of performance

The Sepam™ concept makes it possible to do away with such testing, since

the use of digital technology guarantees the reproducibility of the

performances announced.

Each Sepam™ function undergoes full factory qualification. An internal self-testing

system provides continuous information on the state of the electronic components

and the integrity of the functions.

For example, automatic tests diagnose the level of component polarization voltages,

the continuity of the analog value acquisition chain, non-alteration of RAM memory,

and any absence of settings outside the tolerance range. This guarantees a high

level of availability

Sepam™ is ready to operate without requiring any additional qualification

testing that concerns it directly.

Sepam™ Commissioning Tests

Preliminary Sepam™ commissioning tests involve checks, such as:

b checking for compliance with Bills of Material (BOMs), hardware installation

diagrams, and rules during a preliminary general check

b checking for compliance with the general settings and protection settings

entered with the setting sheets

b checking current or voltage input connections by secondary injection tests

b checking logic input and output connections by simulation of input data and

forcing of output status

b validating the complete protection chain (possible customized logical functions

included)

b checking the connection of the optional MET148-2, MSA141 and MSC025

modules

The various checks are described on the next page.

HAZARD OF ELECTRIC SHOCK, EXPLOSION,

OR ARC FLASH

b Only qualified electrical workers should

install this equipment. Such work should be

performed only after reading this entire set

of instructions.

b NEVER work alone.

b Obey all existing safety instructions when

commissioning and maintaining high-

voltage equipment.

b Beware of potential hazards and wear

personal protective equipment.

Failure to follow these instructions will result

in death or serious injury.

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