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Home > Electrical & Electronics > Electrical Control System > GE L90-W03-HKH-F8L-H6P-L6C-N6C-S6C-U6L-W7G Multilin L90 Protector

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

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Negotiable MOQ: 1 Piece (Price negotiable depending on order volume and customization)

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Other, Global universal model

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Guizhou Yuanmiao Automation Equipment Co., Ltd.

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Material Other, Global universal model

Certification CE

Function Other, Global universal model

Condition New

Task Other, Global universal model

Mathematical Model Other, Global universal model

Signal Other, Global universal model

Customized Non-Customized

Structure Other, Global universal model

The GE Multilin L90-W03-HKH-F8L-H6P-L6C-N6C-S6C-U6L-W7G is a high-performance industrial-grade protective relay under GE’s Multilin L90 series. It is specifically designed for the protection, control, monitoring, and fault diagnosis of medium- to high-voltage power equipment (such as transformers, generators, motors, and transmission lines). Leveraging its modular hardware architecture, configurable protection logic, and multi-parameter monitoring capabilities, this device is widely used in power generation, transmission, distribution, petrochemical, metallurgical, and other industries. It serves as a core component for ensuring the safe and stable operation of power systems, effectively preventing equipment damage and power outages caused by electrical faults such as overcurrent, short circuits, and insulation failures. The following provides a detailed explanation from dimensions including model interpretation, technical parameters, hardware structure, core functions, application scenarios, and installation & maintenance, ensuring the accuracy and completeness of information.

I. Core Technical Parameters1. Electrical Input/Output Parameters

Parameter Category	Specific Specifications
Power Supply	- Input voltage: DC 24V/48V/125V/250V ±15% (wide-range adaptation, no manual switching); - Power consumption: ≤ 20W during normal operation, ≤ 30W when all modules are fully loaded
Current Input	- Number of channels: 8 (2 sets of 3-phase CT inputs + 2 auxiliary current inputs); - Rated input: 1A or 5A (configurable via software); - Measurement accuracy: ±0.1% within the range of 0.1~10x rated current; - Overload capacity: 20x rated current for 1 second, 10x rated current for 30 seconds (prevents damage from CT saturation)
Voltage Input	- Number of channels: 6 (2 sets of 3-phase VT inputs + 1 residual voltage input); - Rated input: 100V (line voltage) or 57.7V (phase voltage) (configurable); - Measurement accuracy: ±0.1% within the range of 0.5~1.2x rated voltage; - Overload capacity: 2x rated voltage for 10 seconds
Digital Input (DI)	- Number of channels: 6 (dry contacts); - Input voltage: DC 24V (external power supply required); - Response time: ≤ 1ms (ensures rapid detection of external control signals)
Digital Output (DO)	- Number of channels: 6 (electromechanical relays); - Contact rating: 5A/250VAC, 5A/30VDC; - Output logic: Configurable as "Normally Open (NO)" or "Normally Closed (NC)" via software

2. Protection Performance Parameters

Protection Function	Setting Range	Operating Accuracy
Overcurrent Protection	0.1~10x rated current (step: 0.01x); Time delay: 0.01~300s (adjustable)	±5% of the set value
Short-Circuit Protection	2~20x rated current (step: 0.1x); Instantaneous or time-delayed action (0.01~10s)	±3% of the set value
Transformer Differential Protection	Differential current: 0.05~0.5x rated current; Restraint coefficient: 0.1~0.5	±5% of the set value
Overvoltage Protection	1.05~1.5x rated voltage (step: 0.01x); Time delay: 0.1~60s	±2% of the set value
Undervoltage Protection	0.5~0.95x rated voltage (step: 0.01x); Time delay: 0.1~60s	±2% of the set value
Overexcitation Protection	Volts-per-Hertz (V/Hz) ratio: 1.05~1.5 (step: 0.01); Time delay: 0.1~30s	±2% of the set value
Temperature Protection	PT100/RTD input range: -50~200℃; Alarm threshold and trip threshold are configurable	±1℃

3. Environmental and Physical Parameters

Parameter Category

Specific Specifications

Operating Environment

- Temperature: -40℃~70℃ (wide-temperature design, suitable for outdoor or high-temperature switchgear environments);
- Humidity: 0~95% RH (non-condensing, suitable for humid coastal or underground power stations);
- Altitude: ≤ 3000m (derating required above 3000m: 1% derating per 100m increase);
- EMI Resistance: Complies with IEC 61000-6-2 (industrial environment) and IEEE C37.90.1 (protective relay immunity standards)

Physical Dimensions

- Size (H×W×D): 144mm×190mm×254mm (standard 3U rack-mounted design, compatible with 19-inch switchgear);
- Weight: Approximately 3.5~4.0kg (including all modules and terminal blocks);
- Protection Class: IP30 (module-level protection; must be installed in a sealed switchgear cabinet to prevent dust and moisture ingress)

II. Hardware Structure and Functional Modules1. Core Control Unit

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:

Flash Memory: 8GB (stores protection configuration parameters, fault records, and event logs; data retention time ≥ 10 years after power failure);
Random Access Memory (RAM): 1GB (temporarily stores real-time monitoring data and calculation results, ensuring smooth operation of multi-tasks).

2. Input/Output Modules

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:

Digital Input (DI): Isolates external signals via optocouplers (isolation voltage ≥ 2500VAC) to prevent interference from the power system;
Digital Output (DO): Uses high-reliability electromechanical relays (mechanical life ≥ 100,000 operations) and is equipped with transient suppression circuits (TVS diodes) to protect relay contacts from voltage spikes.

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.

3. Human-Machine Interface (HMI) and Communication Module

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

Real-time Display: 3-phase current/voltage, power (active/reactive/apparent), frequency, temperature, and protection status;
Parameter Configuration: Setting protection parameters (e.g., overcurrent threshold, time delay) and module functions (e.g., communication protocol parameters) via software;
Fault Query: Displaying the latest 1000 fault records (including fault type, occurrence time, current/voltage waveform during the fault, and action status of protection elements).

Communication Module:

Ethernet: 2 RJ45 ports (10/100Mbps adaptive), supporting Ethernet/IP and Modbus TCP protocols (for connecting to SCADA systems, DCS, or remote monitoring centers);
RS-485: 1 port, supporting Modbus RTU protocol (for communicating with local PLCs or intelligent meters);
Communication Redundancy: Ethernet ports support "ring network" or "dual-star" topology, ensuring uninterrupted data transmission even if one communication link fails.

III. Core Protection and Monitoring Functions1. Comprehensive Protection Functions

The L90-W03-HKH-F8L-H6P-L6C-N6C-S6C-U6L-W7G integrates 12 types of core protection functions, covering common faults in power systems and adapting to protection needs of different equipment (e.g., transformers, generators, motors). Key functions are detailed in the table below:

Protection Function	Application Scenario	Core Features
Transformer Differential Protection	Power transformers (distribution transformers, main transformers in power plants)	- Supports "two-winding" or "three-winding" transformer protection; - Automatically compensates for CT ratio mismatch and phase shift (Y/Δ connection); - Resists CT saturation via 2nd-harmonic restraint (configurable restraint coefficient)
Overcurrent/Short-Circuit Protection	All power equipment (transformers, motors, lines)	- 3-stage overcurrent protection (instantaneous, short-time, long-time) + instantaneous short-circuit protection; - Configurable time-delay curves (IEC standard curves: inverse, very inverse, extremely inverse, definite time)
Overvoltage/Undervoltage Protection	Generators, transformers, and sensitive loads (e.g., PLCs, frequency converters)	- Overvoltage: Prevents insulation damage caused by excessive voltage (e.g., generator overexcitation); - Undervoltage: Protects motors from overcurrent burnout due to low voltage; - Both support configurable time delays to avoid false tripping from transient voltage fluctuations
Overexcitation Protection	Transformers and generators	- Monitors the V/Hz ratio to prevent transformer core overheating or generator stator insulation damage; - Supports inverse-time or definite-time action logic (compliant with IEEE C37.90.1 standards)
Temperature Protection	Transformers (oil temperature/winding temperature) and motors (stator temperature)	- Accepts inputs from PT100/RTD or thermocouples (Type K/J); - Two-level protection: "Alarm" (temperature approaching threshold) and "Trip" (temperature exceeding threshold); - Records temperature trends to support predictive maintenance
Earth Fault Protection	Unearthed or low-resistance earthed power systems	- Detects single-phase earth faults via residual current (3I₀) or residual voltage (3U₀); - Configurable action modes: alarm-only or trip (adapts to different system earthing methods)

2. Real-Time Monitoring and Data Analysis

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

Basic electrical quantities: 3-phase current (Iₐ, Iᵦ, I𝒸), 3-phase voltage (Uₐ, Uᵦ, U𝒸), line voltage (Uₐᵦ, Uᵦ𝒸, U𝒸ₐ), frequency (f, measurement accuracy ±0.01Hz);
Power parameters: Active power (P), reactive power (Q), apparent power (S), power factor (cosφ, measurement accuracy ±0.5%);
Energy metering: Cumulative active energy (kWh) and cumulative reactive energy (kVARh) (compliant with IEC 62053-21/22 Class 0.5 accuracy standards).

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).

3. Control and Configuration Flexibility

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

Tripping/Closing: Remote control of circuit breakers (requires password authentication to prevent misoperation);
Parameter Adjustment: Remote modification of protection settings (e.g., overcurrent threshold) without on-site operations (reducing maintenance costs for remote power stations);
Firmware Upgrade: Remote upgrade of the protector’s firmware via Ethernet to add new functions (e.g., supporting new protection algorithms) or fix bugs.

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).

IV. Application Scenarios and Typical Deployments1. Power Generation Industry

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:

Protect transformers from faults such as short circuits, overexcitation, and excessive oil temperature;
Monitor the generator’s output voltage/current and frequency, and trip the generator circuit breaker in case of overcurrent/overvoltage to prevent damage to the stator and rotor;
Upload real-time data (power, energy) to the DCS for load scheduling and energy metering.

2. Power Distribution Industry

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:

Detect single-phase earth faults in distribution lines (common in 10kV systems) and trigger timely alarms or trips to prevent fault escalation;
Monitor the load current and temperature of distribution transformers, and issue alarms in case of overload to prevent transformer burnout;
Record fault information of the distribution system to assist maintenance personnel in quickly locating fault points and shortening power outage duration.

3. Industrial Enterprises (Petrochemical, Metallurgical)

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

Product Tags: L90-W03-HKH-F8L-H6P-L6C-N6C-S6C-U6L-W7G , GE , Multilin L90