Description

GE Multilin SR469-P1-LO-A20-E

I. Product Overview

The GE Multilin SR469-P1-LO-A20-E is an integrated motor protection relay specifically designed for medium-and high-voltage asynchronous motors, synchronous motors, and other rotating equipment. Positioned as an "intelligent protection and monitoring terminal for full operating conditions of large motors", its core function is to achieve full-lifecycle protection for motors during startup, operation, and shutdown through high-precision electrical parameter collection, multi-dimensional fault criterion analysis, and rapid protection action output. Meanwhile, it integrates real-time monitoring, data recording, and communication interaction functions, providing reliable safety guarantees and operation & maintenance support for key equipment such as large fans, water pumps, compressors, and steel rolling motors in fields including electric power, petrochemicals, metallurgy, and cement.

With comprehensive protection functions, precise measurement accuracy, flexible configuration capabilities, and strong anti-interference performance, this relay is highly adaptable to the high-load, multi-condition, and harsh environmental operating requirements of medium-and high-voltage motors. It serves as a core component for closed-loop management of "fault early warning - precise protection - data traceability" in industrial motor control systems. It performs outstandingly in different industrial scenarios:

In the electric power field, it is used for protecting induced draft fan and forced draft fan motors in thermal power plants. It can accurately identify hidden faults such as rotor bar breakage and uneven air gap, providing early warnings to avoid unplanned shutdowns.
In the petrochemical field, it is suitable for compressor motors in refining and chemical installations. With an explosion-proof design and rapid protection actions (operation time ≤ 10ms) in flammable and explosive environments, it prevents safety accidents caused by fault escalation.
In the metallurgical field, it provides comprehensive protection (such as overload, short circuit, and grounding protection) for main motors in steel rolling production lines. It is adaptable to frequent motor startup and shutdown conditions, with a protection accuracy error of ≤ ±2%.

In terms of hardware architecture, the relay adopts a design of "high-precision data acquisition + multi-core processor + redundant communication". Its core consists of a 32-bit dual-core industrial-grade processor, a 16-bit high-precision A/D sampling chip, multi-channel protection output interfaces, and a multi-protocol communication module. It is equipped with 3 current input channels (compatible with programmable CT ratios from 1:1 to 1:10000), 2 voltage input channels (supporting multiple voltage levels such as 100V/220V/400V), 8 digital input channels, and 6 relay output channels (with a capacity of AC250V/5A and DC24V/10A). It has built-in dual communication interfaces (RS485 and EtherNet/IP) and supports seamless connection with mainstream monitoring systems such as GE CIMPLICITY and Siemens WinCC. Its protection functions cover all types of motor faults, including over 20 protection types such as overload protection (optional inverse time/definite time), short-circuit protection (instantaneous trip/delayed instantaneous trip), grounding protection (zero-sequence current/residual current), locked-rotor protection, phase failure protection, under-voltage/over-voltage protection, rotor bar breakage protection, and bearing temperature protection. The protection logic and action thresholds can be customized via configuration software. With an industrial-grade reinforced design, it uses wide-temperature components (-40℃~70℃), a metal shielded enclosure, and enhanced anti-electromagnetic interference circuits. Complying with international standards such as IEC 61850 and IEC 60255, it can operate stably in industrial sites with strong electromagnetic interference, high dust levels, and high humidity.

II. Technical Parameters

Parameter Category	Parameter Name	Specific Parameters	Unit
Basic Parameters	Model	GE Multilin SR469-P1-LO-A20-E	-
	Product Type	Industrial-grade Integrated Motor Protection Relay	-
	Applicable Objects	Medium-and high-voltage asynchronous motors, synchronous motors (rated voltage ≤ 15kV)	-
	Overall Dimensions (L×W×H)	144×144×180 (panel mounting); 190×170×220 (drawer-type mounting)	mm
	Installation Method	Panel-embedded mounting, drawer-type mounting (compatible with standard 19-inch cabinets)	-
	Power Supply Requirements	AC/DC 85V~265V, frequency 50Hz/60Hz (self-adaptive), power consumption ≤ 15VA	V, Hz, VA
Measurement & Acquisition Parameters	Current Input Channels	3 phase current channels, 1 optional zero-sequence current channel	Channel(s)
	Current Measurement Range	0.1A~100A (direct input); extendable to 10kA via CT	A
	Voltage Input Channels	2 line voltage channels or 3 phase voltage channels	Channel(s)
	Voltage Measurement Range	20V~400V (direct input); extendable to 15kV via PT	V
	Measurement Accuracy	Current, voltage: ±0.2% FS; Power, energy: ±0.5% FS; Frequency: ±0.01Hz	-
	Sampling Frequency	128 points/cycle (sampling frequency of 6.4kHz for 50Hz systems)	Points/Cycle
	Temperature Measurement	Supports 4 RTD (Pt100) or 4 thermocouple (Type K) inputs; measurement range -50℃~200℃; accuracy ±0.5℃	℃
Protection Function Parameters	Core Protection Types	Overload, short circuit, grounding, locked-rotor, phase failure, under-voltage, over-voltage, rotor bar breakage, bearing temperature, winding temperature, etc.	-
	Overload Protection	Optional inverse time (IEC 60255-3 standard) or definite time; adjustable operating current 0.5Ie~10Ie	-
	Short-Circuit Protection	Instantaneous trip operation time ≤ 10ms; adjustable delayed instantaneous trip 0ms~1000ms; adjustable operating current 5Ie~50Ie	ms
	Grounding Protection	Zero-sequence current type/residual current type; adjustable operating current 0.05A~10A; adjustable operation time 0ms~500ms	A, ms
	Locked-Rotor Protection	Adjustable operating current 2Ie~10Ie; adjustable operation delay 0.1s~10s; supports adaptive startup time	s
	Protection Action Output	6 relay outputs, capacity AC250V/5A, DC24V/10A; supports function assignment such as tripping, alarm, and signal feedback	-
Communication & Reliability Parameters	Communication Interfaces	1 RS485 (supports Modbus RTU protocol), 1 EtherNet/IP (supports IEC 61850, Modbus TCP)	-
	Communication Rate	RS485: adjustable 9600bps~115200bps; EtherNet/IP: 100Mbps (self-adaptive)	bps, Mbps
	Data Recording Capacity	Stores up to 100 fault records (including fault type, occurrence time, and 10 pre-fault cycle data) and 500 event records	Record(s)
	Mean Time Between Failures (MTBF)	≥200,000 hours (at 25℃ ambient temperature)	Hour(s)
	Operating Environmental Conditions	Temperature: -40℃~70℃; Humidity: 5%~95% (no condensation); Altitude: ≤3000m; Vibration: ≤2g (IEC 60068-2-6)	-

III. Functional Features

1. Precise Protection for Full Operating Conditions, Covering the Entire Motor Lifecycle

The relay integrates over 20 protection functions to achieve fault protection for motors during startup, operation, and shutdown phases. It adopts a "multi-criterion fusion + adaptive algorithm" to improve protection accuracy:

Overload protection supports the inverse time characteristic specified in IEC 60255-3. It dynamically adjusts the action curve based on the motor heating model, adapting to motors with different load characteristics (e.g., constant torque, variable torque) and avoiding false tripping under light loads and failure to trip under heavy loads.
Short-circuit protection uses a hierarchical strategy of "instantaneous trip + delayed instantaneous trip". The instantaneous trip has an operation time of ≤10ms to quickly cut off severe faults, while the delayed instantaneous trip avoids false tripping caused by startup inrush current.
Rotor bar breakage protection is based on motor current spectrum analysis technology. Through high-precision sampling of 128 points/cycle, it can identify bar breakage faults of less than 0.5% and provide early warnings for hidden motor faults.
Temperature protection supports dual inputs of RTD/thermocouple to monitor winding and bearing temperatures in real time. It issues an alarm first and then trips when temperatures exceed the threshold, preventing insulation damage.

All protection parameters can be configured via software, with an action threshold adjustment accuracy of ±1%, making it compatible with motors of different models and specifications.

2. High-Precision Measurement & Data Recording for O&M Analysis Support

Equipped with a 16-bit high-precision A/D sampling chip and a sampling frequency of 128 points/cycle, it enables precise measurement of electrical parameters such as current, voltage, power, and frequency. The measurement accuracy is ±0.2% FS for current and voltage, and ±0.5% FS for power, meeting the requirements of energy metering levels.

It features powerful data recording functions:

It can store 100 fault oscillography records. Each record includes complete electrical parameter waveforms of 10 cycles before the fault, 4 cycles during the fault, and 6 cycles after the fault, with a sampling resolution of 1ms, providing accurate data support for fault cause analysis.
It can store 500 event records covering key events such as protection actions, parameter modifications, and communication interruptions, with a timestamp accuracy of ±1s.

It supports historical data export. Data can be exported in CSV format via USB interface or communication network, and analyzed for waveform and trend statistics using GE Multilin EnerVista software, improving the intelligence level of operation and maintenance.

3. Flexible Configuration & Intelligent Monitoring for Multi-Scenario Adaptation

It supports dual configuration methods via GE EnerVista and third-party SCADA systems. With built-in standardized function blocks (e.g., AND gate, OR gate, timer), it allows custom protection logic and control circuits through drag-and-drop programming, eliminating the need for complex coding and adapting to control requirements in different industrial scenarios (e.g., standalone operation, multi-machine linkage).

Equipped with a 128×64 dot-matrix LCD display that supports both Chinese and English, it displays real-time motor operating parameters (current, voltage, power, temperature), protection status, and fault information. Common parameters can be modified directly via operation buttons without connecting to a computer.

It supports remote monitoring and control. Through the EtherNet/IP network, it enables remote configuration of protection parameters, real-time data collection, and remote fault diagnosis. Maintenance personnel can complete equipment debugging and fault troubleshooting without on-site operations, improving O&M efficiency.

4. Strong Anti-Interference & High Reliability for Harsh Industrial Environments

It adopts a "multiple shielding + signal isolation + redundant design" to enhance equipment reliability:

The enclosure uses a high-strength metal shielding structure, and key internal circuits are covered with a copper foil shielding layer. A complete shielding network is formed through multi-point grounding, with a shielding effectiveness of ≥80dB. It complies with the IEC 61000-4-3 standard for radio frequency radiation immunity (20V/m), resisting strong electromagnetic interference in industrial sites.
The signal input circuit adopts photoelectric isolation technology with an isolation voltage of ≥2kVrms, blocking common-mode and differential-mode interference and preventing damage from strong on-site electrical signals.
The power supply circuit uses a two-stage EMC filter to filter out grid harmonics and pulse interference, ensuring stable operation even when the power supply voltage fluctuates in the wide range of 85V~265V.

Wide-temperature components (-40℃~70℃) are used in combination with an intelligent heat dissipation design to ensure stable operation in high and low temperature environments. With an MTBF of ≥200,000 hours, it meets industrial-grade high-reliability requirements and is suitable for harsh industrial scenarios such as petrochemicals and metallurgy.

5. Multi-Protocol Compatibility & System Integration for Enhanced Expandability

It has rich communication interfaces and protocol compatibility, supporting dual communication links (RS485 with Modbus RTU and EtherNet/IP with IEC 61850 and Modbus TCP). It can be seamlessly integrated into mainstream monitoring systems such as GE CIMPLICITY, Siemens WinCC, and Schneider Intouch, enabling centralized monitoring and data aggregation of motor operating status.

It supports the IEC 61850 standard and has GOOSE message transmission and reception functions, enabling rapid information interaction with intelligent switchgear, PLCs, and other equipment with an action response time of ≤5ms. It is suitable for digital control systems in smart substations and Industry 4.0 scenarios.

It is equipped with hardware expansion interfaces. Digital input/output channels can be expanded (up to 16 DI and 12 DO channels) by adding I/O modules, and additional communication protocols such as Profibus and DeviceNet can be supported by adding communication modules, enhancing system expandability and compatibility.