SR469-P5-H-A20-T GE high-end microprocessor-based motor protection relay
1. Product Description
The SR469-P5-H-A20-T is a high-end microprocessor-based motor protection relay from GE’s Multilin™ 469 series. Designed for medium-voltage (2.4–13.8kV) motors, it integrates comprehensive protection, metering, diagnostics, and control functions with advanced communication capabilities.
2. Product Series
- Series: GE Multilin™ 469 Series
- Variant: P5-H-A20-T (Phase Differential + High-Resistance Grounding, 20A CTs)
- Compatibility: Part of GE’s industrial motor management platform.
3. Key Features
- Dual Protection Systems: Phase differential (87P) + ground fault (87N/87G).
- High-Resistance Grounding (HRG): Monitors neutral grounding resistor (NGR) health.
- Real-Time Oscillography: 128-cycle fault recording.
- Self-Powered Operation: Uses CT/VT inputs or auxiliary supply.
- Hazardous Location Rated: -T suffix denotes CSA/ATEX/IECEx compliance.
- Dual Ethernet Ports: IEC 61850, Modbus TCP/IP, DNP3.0 protocols.
4. Functions & Roles
- Motor Protection: Stalling, locked rotor, overload, underload, phase imbalance.
- Ground Fault Detection: Sensitive HRG monitoring (0.05–5A).
- Differential Protection: Internal/external CT-based phase comparison.
- Control Logic: Programmable FlexLogic™ for custom automation.
5. Applications
- Industrial Motors: Crushers, pumps, compressors (>500HP).
- Mining: Conveyor drives, hoists.
- Oil & Gas: Offshore drilling motors, LNG compressors.
- Power Plants: ID/FD fans, BFP motors.
- Chemical/Pulp & Paper: High-inertia process motors.
6. Technical Specifications & Parameters
Protection & Electrical Specs
|
Parameter
|
Specification
|
|---|---|
|
Phase Differential (87P)
|
Threshold: 0.1–5.0A (0.01A steps), slope 5–50%
|
|
Ground Fault (87G/51G)
|
HRG range: 0.05–5A (0.01A steps)
|
|
Overload (49)
|
Thermal capacity: 6 thermal curves (IEC/IEEE/NEMA)
|
|
CT Inputs
|
20A nominal (1A/5A optional), 25VA burden
|
|
VT Inputs
|
120V AC phase-to-neutral
|
Communication & I/O
|
Parameter
|
Specification
|
|---|---|
|
Protocols
|
IEC 61850, Modbus TCP/IP, DNP3.0, EtherNet/IP
|
|
Digital Inputs
|
9x (24–250V DC/AC)
|
|
Output Relays
|
6x Form-C (5A @ 250V AC)
|
|
Analog Outputs
|
2x 4–20mA (load/thermal capacity)
|
|
RS485 Ports
|
2x (Modbus RTU)
|
Environmental & Certifications
|
Parameter
|
Specification
|
|---|---|
|
Operating Voltage
|
48–250V DC/AC (self-powered)
|
|
Temp Range
|
-40°C to +70°C (full operation)
|
|
Hazardous Certifications
|
ATEX/IECEx Zone 2, Class I Div 2 (-T variant)
|
|
Standards
|
UL 508, IEC 60255, IEEE C37.90
|
|
Ingress Protection
|
IP52 (front panel)
|
7. Suffix Decoder (SR469-P5-H-A20-T)
|
Code
|
Meaning
|
|---|---|
|
P5
|
Phase Differential protection (87P)
|
|
H
|
High-Resistance Grounding (87N/87G)
|
|
A20
|
20A nominal CT inputs (default)
|
|
T
|
Hazardous location certification (CSA/ATEX)
|
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