PGA-016A Littelfuse Inc, PGA-016A Datasheet - Page 40

• 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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Adjustable Alarm Level
relay at which an LED or an output contact operates to
activate a visual or audible alarm.
Adjustable Time Delay
relay that determines the time between the fault detection
and relay operation.
Alarm Relay Contact
as a switch and is connected to a visual or audible alarm.
Analog Output
from a protection relay used to pass information to a device
or controller.
Asynchronous Motor
the rotor is not proportional to the frequency of the system
to which it is connected.
Conformal Coating
boards from pollutants, corrosion, and mildew.
Continuous Output
output is defined as current that does not automatically stop.
Current Transformer (CT)
produces a current in its secondary circuit in a known
proportion to current in its primary circuit.
CT Loop
transformer and a protection relay or monitoring device.
CT Loop Monitoring
continuity to verify connection.
CT Saturation
transformer (CT) cannot maintain a secondary current
proportional to a large primary current.
CT Local Saturation
and large currents can cause an output from a zero-sequence
(ground-fault) CT even though there is no fault.
CT Saturation Compensation
current amplitude is compared to the peak-to-peak value.
If the peak-to-peak value is much higher than the DFT value
then the relay assumes the CT is into saturation and uses
the peak-to-peak value.
Current-Based Protection
(Trip-levels/data collection etc.) derived from current levels in
a circuit.
Current-Trip Setting
which a relay will operate.
Data Logging
format that can be reviewed for trending, troubleshooting
and reporting.
– The electrical circuit between a current
– Collecting and storing information in a
– A condition that occurs when a current
– A 0–1 mA, 4–20 mA or 0–5 Vdc signal
– Coating used to protect circuit
– Poorly installed phase conductors
- On an PGT-0400 continuous
- Continuous check of CT loop
- Selectable level of current at
– The output of the relay that acts
– A motor in which the speed of
– A setting on a protection
– A setting on a protection
– A transformer that
– Protection parameters
- The fundamental
POWR-GARD
Glossary of terms
38
DFT (Discrete Fourier Transform) Harmonic
Filter
component of current and voltage and reject harmonics.
This allows lower trip settings and eliminates nuisance trips
due to harmonics.
Differential Module
6200 and PGR-6300 motor protection relays to add phase-
differential protection.
Digital Harmonic Filter
processing (DSP) techniques such as the DFT to eliminate
the measurement of harmonic components. In terms of
ground-fault detection, use of a harmonic filter allows a
setting below the background noise level.
Discrete Fourier Transform (DFT)
A mathematical algorithm used in a DSP to extract a single
frequency, such as the fundamental frequency, from a signal.
Earth Leakage
EFCT (Earth Fault Current Transformer)
A current transformer engineered to accurately detect low
level ground-fault current.
Fail-Safe Mode (also known as Under Voltage
or UV)
tripped) operation. If the protection relay loses supply
voltage, the system will trip or alarm. (Also see: Non-fail-
safe).
Fault Current
conductor is faulted to another phase or ground.
Feeder
equipment, the source of a separately derived system,
or other power supply source and the final branch-circuit
overcurrent device.
Feeder Protection
devices installed on a feeder circuit to supplement,
compliment or replace downstream protective devices.
Flux Conditioner
material inserted in a current-transformer window, used to
reduce local saturation which can cause nuisance tripping.
Fundamental Frequency
power system, the frequency of the generated voltage. In
North America this is typically 60 Hz (60 cycles per second).
Ground Check Conductor
in a trailing cable used to assist in monitoring continuity of
the ground conductor. Typically designed to be the smallest
conductor, it is the first to break when cable is mechanically
stressed.
®
Protection Relays
– An algorithm used to measure the fundamental
– Output relay is energized during normal (not
– All circuit conductors between the service
- The current that flows when a phase
– See Leakage Current.
© 2009 Littelfuse
– A ring of magnetically conductive
– Overcurrent or overvoltage
– An accessory for the PGR-
– The use of digital signal-
– In an alternating-current
– An insulated conductor
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POWR-GARD
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®
Protection Relay Catalog
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