GE L90-W03-HKH-F8L-H6P-L6C-N6C-S6C-U6L-W7G Multilin L90 protector

Dual-Core CPU Module: Adopts an ARM Cortex-A9 (1GHz clock speed) + dedicated Digital Signal Processor (DSP) architecture. The main CPU handles protection logic operations, data storage, and communication management; the DSP undertakes high-speed Analog-to-Digital Conversion (ADC) and real-time fault calculations (e.g., differential current calculation, harmonic analysis), with a protection response time ≤ 20ms (enabling rapid isolation of short-circuit faults).

ADC Module: 16-bit resolution, 200kHz sampling rate (synchronous sampling for all current/voltage channels), with a sampling time difference ≤ 1μs between channels. This ensures synchronized sampling of 3-phase current/voltage signals, avoiding calculation errors caused by asynchronous sampling (especially critical for differential protection).

Storage Module:

Current/Voltage Sampling Module: Integrates precision Current Transformers (ICTs) and voltage dividers to convert high-current/high-voltage signals from the power system into low-amplitude signals (0~5V) suitable for ADC sampling. It also includes an anti-aliasing filter (cutoff frequency: 50kHz) to suppress high-frequency interference (e.g., switching transients).

Digital Input/Output Module:

Power Supply Module: Optional dual-redundancy design, supporting two independent DC power inputs. If one power supply fails, the other automatically takes over (switching time ≤ 100ms), ensuring uninterrupted operation of the protector.

HMI Module: 3.5-inch color LCD touchscreen (320×240 resolution) with 5-level backlight adjustment. Its functions include:

Communication Module:

Multi-Parameter Monitoring: Continuously collects and calculates electrical parameters of the power system, including:

Waveform Recording: Automatically records current/voltage waveforms when a fault occurs (2 cycles before the fault, 10 cycles after the fault, sampling rate 200kHz). Waveform data can be exported in COMTRADE format (a standard format for power system fault records) for offline analysis (e.g., identifying fault types, locating fault points).

Trend Analysis: Stores historical data of key parameters (current, voltage, temperature) at configurable intervals (1 minute ~ 1 hour) and generates trend curves (e.g., 24-hour current trend, weekly temperature trend). This helps users identify equipment aging, load changes, or potential faults (e.g., a gradual increase in transformer winding temperature indicating insulation degradation).

Remote Control: Supports remote operations via communication interfaces (Ethernet/RS-485), including:

Logic Configuration: GE’s dedicated software "Multilin EnerVista" provides a "graphical logic editor", allowing users to combine basic protection elements (e.g., overcurrent, undervoltage) with digital inputs/outputs to customize protection logic. This meets special protection needs (e.g., interlocking protection for multiple transformers, backup protection for specific scenarios).

Applicable Equipment: Main transformers, auxiliary transformers, and generators in thermal power plants, hydropower plants, and wind farms;

Deployment Method: Installed in the control cabinet of power generation units (e.g., transformer control room, generator control panel). The protector is connected to the CTs/VTs of the transformer/generator and to the plant’s DCS system via Ethernet;

Core Roles:

Applicable Equipment: Medium-voltage distribution transformers (10kV/0.4kV), distribution lines, and switchgear in industrial parks, commercial buildings, and residential areas;

Deployment Method: Installed in medium-voltage switchgear (e.g., 10kV ring main units, distribution cabinets). The protector is connected to the line’s CTs/VTs and to the distribution SCADA system via RS-485/Ethernet;

Core Roles:

Applicable Equipment: Large motors (e.g., compressors, pumps, fans), on-site high-voltage transmission lines, and transformers in self-owned power stations;

Deployment Method: Installed in workshop electrical control rooms or self-owned power station control cabinets. The protector is connected to the CTs/VTs of the motors/lines and integrated into the enterprise’s industrial control system