PGA-016A Littelfuse Inc, PGA-016A Datasheet - Page 42

• Manufacturer Part Number: PGA-016A
• Description: BULK / WATERTIGHT COVER FOR PGR-6200 / PGR-7200
• Manufacturer: Littelfuse Inc

Specifications of PGA-016A

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

P
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Neutral Grounding Resistor (NGR)
limiting resistor connecting the power-system neutral to ground.
N.C. Contact (Normally Closed Contact)
contact that is closed when the relay is not energized.
N.O. Contact (Normally Open Contact)
contact that is open when the relay is not energized.
Non-Fail-Safe (also known as Shunt Trip or
SH)
when a trip occurs. If the protective device loses supply
voltage, the system can continue to operate but will not be
protected. (Also see: Fail-safe)
Non-Volatile Memory
is removed.
Nuisance Trip
to misinterpreted readings.
Phase Current
Phase Current Transformer
installed so that current from one phase conductor flows
in its primary winding. For motor and feeder protection
and metering in a three-phase system, three current
transformers are typically used to measure phase currents.
Phase Differential Protection
to detect winding-to-winding failures and winding-to-ground
failures in an ac motor.
Phase Loss
Phase Voltage
phase conductor and ground.
Primary Rating (for CTs)
primary side of a current transformer. The first number in
the ratio 500:5 is the primary rating. Under ideal conditions
500 A of primary current flow through the CT will produce
5 A of current out the secondary terminals.
Pulsing
resistance grounded system using a contactor to short out
part of the NGR elements (or to open one of two NGRs
connected in parallel). Another version of pulsing is imposing
a higher frequency signal on power lines and using a wand
detector to locate the point of fault on a conductor
Pulsing Circuit
Online/Offline Monitoring
when the system is energized and de-energized.
– Output relay is energized and contacts change state
– Modulating the ground-fault current on a
– Loss of power on a single phase.
– An undesired change in relay output due
– Current present in a phase conductor.
– The voltage measured between a
– See Pulsing.
– Data is retained when power
– The current rating of the
– Insulation monitoring
– A current transformer
– Protection designed
POWR-GARD
Glossary of terms
– A current-
– Relay
– Relay
40
Open CT Hazard
develop a dangerously high voltage when the primary is
energized.
Relay
contact (or contacts) under the control of another circuit.
Typically an electromagnet.
Relay Operating Mode
methods of operation used for Undervoltage or Shunt trip
breakers.
Resistance-Grounded System
system in which the transformer or generator neutral is
connected to ground through a current-limiting resistor.
(Also see: Solidly Grounded System, Ungrounded system).
Ride-Through Time
relay can maintain operation during a control-power dip.
RTD
experiences a linear change in resistance with a change
in temperature. Used to provide temperature metering.
Common RTDs are 100 Ω platinum, 100 Ω nickel, 120 Ω
nickel and 10 Ω copper.
Sensitive Ground-Fault Protection
designed to accurately detect extremely low ground-fault
current levels without nuisance tripping.
Solidly Grounded System
in which the neutral point of a wye connected supply
transformer is connected directly to ground.
Trailing Cables
power to mobile equipment. They typically contain 3 phase
conductors, 2 ground conductors and a pilot wire (or ground-
check conductor).
Trip Level Settings (current)
levels to define when a relay should operate.
Trip Time Settings
present before trip action is taken.
Trip State
True RMS
to derive true current or voltage value in electrical
measurement when the waveform is non-sinusoidal.
Ungrounded System
no point in the system is intentionally grounded. This was
most common in process industries where continuity of
service during a single-phase-to-ground-fault was required.
®
Protection Relays
– Resistive Temperature Detector. A material that
– An electrical switch that opens and closes a
– The state of the output contacts after a relay trip.
– “Root-Mean-Square” calculation used
– Power cables used to supply electrical
© 2009 Littelfuse
– An open-circuited CT secondary can
- The time a fault is required to be
– The amount of time a protection
– An electrical system in which
– Fail-safe or non-fail-safe
•
– An electrical system
POWR-GARD
– Selectable current
– An electrical
®
– Protection
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