Application of LCD screen on smart grid fault recorder

Fault recorders are indispensable monitoring devices in power systems. In the operation and maintenance system of smart grids, their main task is to sample, analyze, and record voltage, current, frequency, and fault waveforms in the power system, thereby providing a basis for fault diagnosis and system dispatch. To enable field personnel to view waveform data, analyze event records, and execute system operations in real time, the recorder is typically equipped with a high-reliability LCD screen as a core component of the human-machine interface (HMI). This LCD screen not only displays information but also maintains stable operation in harsh environments such as high electromagnetic interference, high temperature and humidity, and long-term operation.

The Role of LCD Screens in Fault Recorders

Smart grid fault recorders are typically installed in substations, high-voltage distribution cabinets, or power control centers, in complex environments. The LCD display module mainly performs the following functions:

1. Real-time Data Display: Dynamic parameters such as current, voltage, phase angle, frequency, and power factor.Visual display of fault waveform curves and event trigger information.
2. Status and Alarm Interface: Power channel operating status, communication status, synchronization status (GPS clock), etc.Intuitive presentation of alarm information, facilitating quick judgment by maintenance personnel.
3. Parameter Setting and Interactive Operation: Parameter configuration, record query, and file export are achieved in conjunction with the touchscreen.
4. Data Playback and Historical Trend Display: Waveform playback, zooming, and comparative analysis of recorded files are possible.

Therefore, the LCD screen is not only a display component but also a key node in the human-machine interface of the fault recorder system.

Application Environment and Technical Requirements

The requirements for LCD screens in power fields are far higher than those for consumer electronic devices, mainly reflected in:

Project	Requirements
Operating Temperature	-30°C to +85°C, requiring wide temperature adaptability
Protection Rating	Dustproof and moisture-proof design supported; mounting panel typically meets IP 65
Electromagnetic Compatibility (EMC):	Meets IEC 61000-4 series standards; anti-static ±15 kV
Visibility	Readable under strong light; high brightness ≥700 cd/m²; anti-reflective (AR) or anti-glare (AG) process
Stability	Supports 7×24 h continuous operation; backlight lifespan ≥50,000 hours
Interface Compatibility	LVDS/eDP/TTL compatible; can be directly connected to industrial control motherboards and DSP control boards

LCD Screen Type and Selection Parameters

1.Display Type: Fault recorders commonly use TFT-LCD color displays, with common resolutions of 800×480, 1024×600, and 1280×800. Some high-end models support FHD. IPS panels provide wider viewing angles and better color reproduction.

2.Common Sizes: Depending on the equipment structure and installation space, common selections are as follows:

Size	resolution	interface	features
7.0-inch	800×480/1024×600	LVDS/TTL	Compact panel, suitable for embedded waveform recorders
10.1-inch	1280×800	LVDS/eDP	Mainstream size for industrial control displays
12.1-inch	1024×768/1280×800	LVDS	Wide temperature and wide viewing angle version, suitable for outdoor station control equipment

3.Backlight System: Uses a high-brightness LED backlight, with brightness reaching 1000 cd/m²; Features PWM dimming for day/night adaptive brightness control; The backlight driver module must have overcurrent and overtemperature protection functions.

3.Examples of Common Models

Brand	Model	Specifications
AUO	G101EVN01.0	10.1″, 1280×800, LVDS, 800 cd/m², wide temperature range -30 to 85℃
BOE	HT101WX1-200	10.1″, 1280×800, LVDS, anti-interference design
Tianma	TM070RDH13	7″, 1024×600, LVDS, high brightness IPS

LCD displays have become an indispensable visualization component in smart grid fault recorder systems. Their stable photoelectric performance, excellent electromagnetic compatibility, and flexible customization capabilities have led to their widespread application in substation automation, power distribution system monitoring, and intelligent inspection equipment. Choosing the right industrial LCD screen not only enhances the interactive experience of the recorder but also ensures the safe, accurate, and visual transmission of power system operation data.

Hangzhou LEEHON Technology Co., Ltd., a provider of LCD display driver solutions specializing in the industrial field, has established deep partnerships with many leading global LCD panel manufacturers, including BOE, TIANMA, IVO, AUO, Innolux, and Kyocera, professionally supplying multi-brand, full-series industrial-grade LCD displays and customized solutions.