Table of Contents
Advertisement
A K D - 2 0 A N D E N T E L LY S I S LO W V O LTA G E S W I TC H G E A R
55
6. Testing and inspecting
6.1 General
After the equipment has been installed and all
connections made, it must be tested and inspected
before it is put in service. Although the equipment
and devices have been tested at the factory, a final
field test must be made to be sure that the
equipment has been properly installed and
that all connections are correct.
Warning: The equipment must be completely
de-energized while the tests are in progress.
Avertissement: Pour les tests, l'équipement
doit être entièrement coupé de la source
d'alimentation principale.
Directions for testing relays, instruments,
and meters are given in the instruction book
furnished for each device. The proper settings
of the protective relays and circuit breaker trip
units or EntelliGuard Messengers are normally
determined from a complete power system
coordination study performed by the purchaser or
their consultant; therefore, the settings of these
devices must be made by the purchaser. When the
equipment is shipped from the factory, the time
dial of all inverse-time induction disc relays (i.e.,
IFC types) is set to zero to prevent contact bounce
during transportation.
Note: The trip setting adjustments of the trip unit
or Messenger for each circuit breaker may be at any
setting when shipped from the factory and must
be correctly set prior to energization of
the equipment.
Remarque: Le paramètre de l'unité de
déclenchement de chaque disjoncteur peut
être défini sur n'importe quelle valeur après la
livraison. Il doit être correctement défini avant
toute alimentation de l'équipement.
General instructions for setting the relays are
given in the applicable Relay or Trip Unit Instruction
Book. Directions for Entellisys instrumentation is
provided in DEH-501. The extent of the tests on the
equipment as a whole will depend on the type and
function of the equipment. Tests which should
be performed, however, include circuit breaker
operation, and switchgear meggering, phasing,
and grounding checks.
High-potential tests to check the integrity of the
insulation are not necessary if the installation
instructions are carefully followed. If local codes
demand this test, or the purchaser wishes to make
highpotential tests, the voltage should not exceed
75 percent of the IEEE factory test voltage. For the
power circuit, the IEEE factory test voltage is two
times switchgear rating plus 1,000 volts. See Table
6.1. Potential and control power transformers must
be disconnected during highvoltage testing.
Table 6.1 - Factory high potential test values
Switchgear
ANSI test voltage,
voltage rating
ac RMS
600V
2200V
480V
1960V
240V
1480V
Field test voltage,
ac RMS
1650V
1470V
1110V
Advertisement
Table of Contents
