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Differences Between Phase-to-Phase Distance Protection (21P) and Ground Distance Protection (21G)
        The core difference between phase-to-phase distance protection and ground distance protection lies in the selection of measured quantities, fault response range, and connection methods. They complement each other to form a complete distance protection system for high-voltage transmission lines, both following the basic principle: operation if the measured impedance is less than the setting impedance. Key…
2026/03/04
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Generator Protection Relay Panel : Composition and Function
Scope of Application         The Generator Protection Relay Panel is mainly suitable for the control and protection of hydraulic units, gas-fired units, biogas units, and large diesel units. Main Components         Generator differential protection relay, generator rotor earth fault protection relay, generator backup protection relay, generator measurement and control device, cabinet (2260*800*600 or 2360*800*600)…
2025/11/25
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Transformer Protection Relay Panel：Composition and Function
        Transformer Protection Relay Panel is primarily used in automation systems for substations and distribution stations in power systems of 11kV, 33kV, 132kV and above. Its main function is to ensure that the transformer can promptly trip the faulty circuit in case of overload, short circuit, gas relay activation, and other abnormal operating conditions, thereby protecting the…
2025/11/24
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Challenges in Miniaturizing 36kV Switchgear
        The miniaturization of switchgear is a common demand in the IEC market. For instance, the standard dimensions for 13.8kV (17.5kV), 1250A switchgear are typically 600mm in width and 2100mm in height, while 3150A versions are generally only 900mm wide.         However, 36kV air-insulated switchgear typically has a width of 1000mm, with a maximum…
2025/11/21
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What are the common types of low-voltage switchgear?
A. International Mainstream Brand Series         These series are typically introduced by multinational electrical corporations and are well-known and applied globally. 1.MNS®Series         Brand: ABB               Characteristics: One of the world’s most famous modular, withdrawable low-voltage switchgear systems. It features a modular design, compact construction, excellent interchangeability of…
2025/11/14
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Renovation Scheme for Unattended Automatic System of Hydropower Station
The core of the transformation of the unattended automation system for hydropower stations is to upgrade the traditional manually attended power station into a modern intelligent power station with “unattended operation and minimal personnel on duty” through computerized monitoring, intelligent sensing, reliable communication and remote centralized control. It realizes remote monitoring, automatic control, fault self-diagnosis and safety early warning, greatly…
2026/09/24
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