GE SD-98762
GE SD-98762 – Stand-Alone Phasor Measurement Unit (PMU)
The SD-98762 is a sophisticated device designed for wide-area monitoring, protection, and control (WAMPAC) in electrical power systems. It provides synchronized, high-speed, high-accuracy measurements of voltage and current phasors, frequency, and rate of change of frequency (ROCOF), all time-synchronized via GPS.
Key Technical Parameters & Features
1. Measurement Capabilities
- Phasor Measurements:
- Channels: Up to 10 voltage phasors and 20 current phasors.
- Reporting Rate: User-configurable, typically up to 120 frames per second (for 60 Hz systems).
- Compliance: Meets and exceeds the requirements of the IEEE C37.118.1-2011 standard for PMUs (both “P” and “M” performance classes).
- Analog Measurements:
- Voltage & Current: True RMS values of all measured voltages and currents.
- Frequency & ROCOF: Highly accurate measurement of system frequency and its rate of change.
- Power: Calculated real (MW), reactive (MVAR), and apparent power (MVA).
- Accuracy: (Under defined conditions per IEEE C37.118.1)
- TVE (Total Vector Error): < 0.1% (for M-class) and < 1% (for P-class) under steady-state conditions.
- Frequency Error: < 0.0005 Hz (M-class), < 0.005 Hz (P-class).
- ROCOF Error: < 0.01 Hz/s (M-class).
2. Inputs / Outputs (I/O)
- Analog Inputs:
- Voltage (Vx): 12 analog voltage inputs (typically 67V L-N or 115V L-L).
- Current (Ix): 24 analog current inputs. Configurable for 1A or 5A secondary CTs.
- Contact I/O:
- Binary Inputs (Status Points): 24 configurable contact inputs for status monitoring (e.g., breaker position, alarm contacts).
- Binary Outputs (Control Relays): 12 configurable Form-C output relays for control, alarm, or tripping functions.
- Optical Ports: 4 front-facing optical ports for configuration and data extraction.
3. Communication Interfaces
- Time Synchronization:
- GPS Receiver: Integrated IRIG-B (AM modulated) input for precise time synchronization from a GPS clock source. This is critical for the time-stamping of phasor data.
- Data Communication Ports:
- Ethernet: Dual 10/100 Mbps Ethernet ports for station communications and data streaming.
- Protocols:
- IEEE C37.118.2: The standard protocol for streaming synchrophasor data to a Phasor Data Concentrator (PDC).
- IEC 61850 (MMS and GOOSE): For integration with modern substation automation systems (SAS).
- DNP 3.0: For SCADA communications and integration with existing control systems.
- Modbus TCP/IP & RTU: For device configuration and data access.
- Serial Ports: Multiple RS-232/RS-485 ports for legacy communication needs.
4. Recording and Oscillography
- Disturbance/Fault Recorder: Capable of triggering and recording high-speed oscillography (event reports) based on user-defined conditions (e.g., faults, frequency excursions).
- Continuous Recording: Can buffer data continuously, saving it upon a trigger event to provide pre-trigger and post-trigger data.
- COMTRADE Format: Records data in standard COMTRADE (IEEE C37.111) format for easy analysis in power system software tools.
5. Physical & Environmental Specifications
- Enclosure: Designed for 19-inch rack mounting. Standard depth for panel or relay house installation.
- Power Supply: Available in a range of DC and AC operating voltages (e.g., 24/48/125/250 VDC, 120/240 VAC).
- Operating Temperature: -40°C to +85°C (-40°F to +185°F), suitable for harsh substation environments.
- Compliance: Meets industry standards for EMI, RFI, surge immunity, and seismic performance.
6. Human-Machine Interface (HMI)
- Front Panel Display: A large, backlit LCD screen for local status information, measurements, and event summaries.
- Navigation & Control: Keypad and menu-driven interface for local configuration and control.
- LED Indicators: Status LEDs for power, communication, synchronization, and alarms.
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GE Company Introduction
General Electric Company (GE) is a renowned multinational conglomerate with diversified businesses spanning energy, aviation, healthcare, renewable energy, and digital industries. Below are its key details:
1. Company Overview
- Founded: 1892 (merger of Edison Electric Light Company and Thomson-Houston Electric Company)
- Headquarters: Boston, Massachusetts, USA
- Founders: Thomas Edison (technical pioneer), Charles Coffin (business integrator)
- Current CEO: Larry Culp (since 2018)
- Market Cap: ~$120 billion (2023 data, adjusted after spin-offs)
2. Core Business Segments
After strategic restructuring, GE now focuses on three main sectors:
- Aviation (GE Aerospace)
A global leader in aircraft engines and systems, including CFM International’s (joint venture with Safran) LEAP engines. - Healthcare (GE HealthCare)
Spun off in 2023, specializing in medical imaging, ultrasound, and life care equipment (e.g., CT, MRI machines). - Energy Transition (GE Vernova)
Launched in 2024, combining renewable energy (wind, hydro), gas power, and grid solutions.
3. Historical Milestones
- Early 1900s: Pioneered electrification, inventing the first commercial incandescent lamp and X-ray machine.
- 1970s: Entered aviation with the GE90 jet engine.
- Post-2008: Restructured after the financial crisis, divesting GE Capital.
- 2015-2020: Pushed digital transformation with the Predix industrial IoT platform.
- 2020s: Spun off non-core assets (e.g., appliances, biopharma) to focus on advanced manufacturing.
4. Presence in China
Since 1906, GE has contributed to projects like the Three Gorges Dam and COMAC C919, with multiple R&D and manufacturing sites (e.g., Beijing, Shanghai, Wuxi).
5. Recent Developments (2023-2024)
- Completed spin-offs of GE HealthCare and GE Vernova, leaving GE Aerospace as the remaining public entity.
- Accelerated sustainable tech R&D, including hydrogen-powered turbines and hybrid-electric aircraft engines.
6. Corporate Culture & Legacy
- Slogan: “Imagination at Work”
- Achievements: Holds numerous Nobel-level innovations and consistently ranks in the FortuneGlobal 500.
Through continuous transformation, GE aims to lead in low-carbon and high-tech industrial solutions.
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