Description
Product Overview
889-E-P5-P5-B5-L-S-S-A-L-A-M-A-P-F-C-SE-N-N-B-4-1 is a GE Grid Solutions Multilin 889 Series generator multifunction protection relay, built on the Series 8 protection platform. It integrates generator protection, metering, sequence-of-event recording, control logic and high-speed communications for synchronous generators, small hydro units and cogeneration equipment. This specific ordering code defines dual 5A CT current banks, mixed ground input, 24–48 VDC auxiliary power, dual RTD modules, custom I/O card and communication options for power plant generator protection panels.
Technical Specifications
| Item | Parameter |
|---|---|
| Manufacturer | GE Grid Solutions (Multilin) |
| Model | 889 Generator Protection Relay, Order Code:889-E-P5-P5-B5-L-S-S-A-L-A-M-A-P-F-C-SE-N-N-B-4-1 |
| Product Type | Multifunction Generator Protection Relay |
| Current Input J Bank | P5: 5A 3-phase CT inputs + voltage PT inputs |
| Current Input K Bank | P5: 5A 3-phase CT inputs + voltage PT inputs |
| Ground Input B5 | 5A ground CT input (J1,K2) plus sensitive 50:0.025A high-sensitivity ground input (K1) |
| Auxiliary Power Supply | L: 24–48 VDC |
| Slot B I/O | S: 6-channel RTD module (PT100, Ni100, Cu10 etc.) |
| Slot C I/O | S: 6-channel RTD module |
| Slot F I/O | A: 2 Form-A relays, 3 Form-C relays,7 digital inputs |
| Slot G I/O | L:7 digital inputs / logic module |
| Communication | SE: Dual Ethernet ports, IEC61850, PRP parallel redundancy protocol |
| Mounting | Panel cutout mounting, standard relay cabinet installation |
| Operating Temperature | -40 °C ~ +85 °C |
| Humidity | 5%–95% RH, non-condensing |
| Certifications | IEC61850, CE, UL, CSA |
| SOE Resolution | 1 ms high precision time stamped event recording |
Key Features
- Comprehensive Generator Protection Suite: Includes overcurrent, negative sequence, loss of excitation, reverse power, over/under voltage, over/under frequency, stator ground fault, differential protection and out-of-step protection for generator main and backup protection.
- Dual RTD Temperature Monitoring: Two 6-channel RTD modules to monitor stator winding, bearing temperature, alarm and trip on over-temperature.
- Dual 5A CT Measurement Banks: Dual independent 3-phase current/voltage acquisition banks, suitable for dual CT installation on generator main circuit.
- High-Sensitivity Ground Fault Input: B5 option provides standard 5A ground CT plus ultra-sensitive 0.025A input for detecting high-impedance stator earth faults.
- Redundant Ethernet IEC61850 Communication: Dual Ethernet with PRP zero-switchover redundancy for substation network, supporting GOOSE interlock, MMS metering and event upload.
- Built-in Metering & SOE: Real-time power, energy, voltage/current metering; 1ms timestamp SOE logs for fault post-mortem analysis.
- Programmable Logic & Control: Custom logic equations, breaker control, synchronism check, auto synchronizer functions for generator paralleling control.
- Local HMI & Event Storage: Front LCD display, local operation keys, large on-board non-volatile memory to store fault oscillography, event records and disturbance waveforms.
Applications
- Thermal power plant synchronous generator main protection panels
- Cogeneration and industrial on-site power generation units
- Small hydroelectric generator protection and control cabinets
- Biogas / landfill gas generator sets
- Combined cycle auxiliary generator protection
Installation & Maintenance Notes
- Apply ESD protection before opening relay cover or inserting modules.
- Verify CT polarity, PT wiring and grounding before energizing; incorrect CT polarity can cause misoperation during faults.
- Separate CT/PT wiring, RTD temperature cables from high voltage control cables to reduce interference.
- Configure protection settings, logic equations, GOOSE and IEC61850 parameters using GE EnerVista software.
- Perform secondary injection protection test and breaker control functional test during commissioning and overhaul.
- Regularly download SOE and oscillography records for equipment health review.
- Confirm full ordering code match, firmware version and setting file backup before spare relay replacement.
FAQ
Q: What does B5 ground input option mean? A: B5 combines standard 5A ground CT and a sensitive 0.025A low-level ground input, used for high impedance stator earth fault detection on generators.
Q: What communication protocol does the SE suffix support? A: SE = dual Ethernet with IEC61850 including GOOSE and PRP parallel redundancy protocol for high availability substation automation networks.
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