GE Multilin 339-E-P5-G5-H-R-S-N-M-SN-D-N Motor Protection Relay

1 All motor basic protection and advanced measurement & control functions are integrated into one unit, eliminating extra separate measurement instruments, reducing the quantity of cabinet components and cutting wiring & cabinet reconstruction cost.2 Drawout drawer modular body allows plug-and-play replacement without disconnecting secondary cables, greatly shortening downtime for fault maintenance and periodic calibration, compatible with old series protection units without cabinet hole modification.3 Self-developed adaptive motor thermal model algorithm supports triple thermal accumulation correction from RTD temperature, negative sequence current and startup times, accurately distinguishing short startup impulse and long-term overload heating to avoid motor insulation burnout or unnecessary protection tripping.4 Complete standardized industrial communication architecture, natively compatible with Modbus TCP, DNP3.0, IEC 61850 and IRIG-B millisecond clock synchronization, seamlessly connecting mainstream DCS, PLC and upper monitoring systems with stable data transmission against industrial electromagnetic interference.256 local-stored fault events with precise 1ms time stamp and multi-cycle waveform recording, built-in automatic motor health trend report, enabling maintenance staff to trace full fault process without external acquisition equipment and shorten troubleshooting time.6 Full-process security audit logging, all setting modifications, remote operations and authority changes are recorded, complying with safety compliance and audit requirements of power and chemical industries.7 Fully expanded IO configuration, 10 digital inputs with 2 Form A and 5 Form C relay outputs, customizable soft logic interlock to realize motor start-stop interlock, automatic standby switching of fans & pumps and fault sound-light alarm linkage.8 Wide-range universal AC/DC power supply compatible with 110-230VAC and 110-250VDC, no extra power conversion module required to match different power distribution room power standards.

More than 30 motor-dedicated protection logics built-in: adaptive thermal overload protection, definite/inverse phase overcurrent, instantaneous short-circuit protection, sensitive ground fault protection, locked rotor protection, current unbalance/open-phase protection, phase sequence reversal protection, overvoltage/undervoltage protection, frequency limit protection, under-power/no-load protection, startup frequency limitation suppression, acceleration timeout protection, breaker failure protection, external customized fault interlock protection.

Real-time measurement of three-phase voltage, three-phase current, active/reactive power, power factor and cumulative electric energy; multi-channel RTD temperature collection; statistics of single startup current, startup duration and running hours; real-time monitoring of frequency, zero-sequence current and negative sequence current.

256 millisecond time-stamped event storage; high-speed waveform recording with 32 sampling points per cycle to store complete waveforms before and after faults; automatic storage of motor health trend curves; IRIG-B time synchronization for unified timing of all station equipment.

10 passive digital inputs; 2 Form A normally open relay outputs, 5 Form C changeover contact outputs; all output contacts with arc extinction design to drive field intermediate relays, alarm indicators and breaker trip circuits.

RJ45 10/100M Ethernet interface; support fiber communication expansion; parallel multi-protocol transmission; support remote setting reading & writing, remote equipment control and remote firmware upgrade.

Three-proof coating with code D, operating temperature range -40℃~70℃, vibration and electromagnetic interference resistance complying with IEC60255 industrial relay standard; metal shield cabinet to restrain radiation interference from frequency converters and high-power motors.

Auxiliary equipment of thermal power plants: induced draft fan, forced draft fan, coal mill, circulating water pump motor protectionWater treatment plants: clean water pump, sewage pump, dosing stirring motor, aeration fanMining and metallurgy: belt conveyor, crushing motor, dust removal fan, slurry pumpPetrochemical industry: process compressor, circulating pump, stirring motor, medium and small motors in explosion-proof areasCement building materials: kiln fan, raw material conveying motor, cooling water pumpMunicipal power distribution: pump station, large air conditioning fan & pump, medium voltage building motorPaper and textile industry: high-power transmission motor, circulating water supply equipmentNew energy supporting facilities: cooling water pump and dust removal fan in photovoltaic & wind power plants

1 How to select P5 and P1 suffix models during procurement?A: P5 matches standard CT with 5A output, widely used in industrial power distribution rooms; P1 only matches 1A high-precision small-size CT, mostly used for high-precision metering renovation projects. Directly purchase P5 model if secondary CT current on site is 5A.2 Can this model be directly applied to 6kV medium voltage motor circuits?A: Yes, this unit supports full protection of medium voltage motors, only matched with CT and PT of corresponding voltage withstand grade, and put into operation after strictly complying with safety specifications of medium voltage secondary circuit wiring.3 No display on equipment front panel, what is the fault?A: Prioritize checking power supply circuit voltage and power cable terminals; if power supply is normal with no display, the main control power module is faulty, extract the whole unit and replace spare device for quick recovery.4 Frequent false thermal overload alarm during operation, how to solve?A: Enter EnerVista software to check motor thermal model parameters, supplement RTD temperature compensation and negative sequence current correction coefficient, reduce startup thermal accumulation rate to distinguish short startup impulse and continuous overload.5 Can setting values and fault recording data be saved after power failure?A: Built-in non-volatile memory chip permanently stores all protection settings, fault waveform records and operation data after power cut, no backup battery required.6 What is the original factory warranty period and spare parts delivery cycle?A: 36-month full warranty for brand new original complete unit; standard spot models delivered within 3-7 working days, customized special coating and communication module models with delivery cycle of 15-25 working days.7 How to realize unified time synchronization of all 339 units in full plant?A: Connect external IRIG-B clock source to device synchronization terminal or adopt Ethernet NTP network time synchronization to achieve 1ms time sequence alignment for all units.8 Can old control cabinet replace old basic 339 models without modifying cabinet holes?A: This unit adopts standard 339 drawout body size, cabinet hole and secondary plug definition are universal for all models of the same series, plug-and-play replacement without modifying cabinet holes and secondary wiring.