High and Low Voltage Switchgear | Technical Solution Sharing

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Miniaturizing 36kV Switchgear

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.

Low-Voltage Switchgear

What are the common types of low-voltage switchgear?

For applications with limited budget, simple circuits, and no frequent changes, the fixed-mounted GGD is a cost-effective choice. For applications with high requirements for supply continuity, frequent operation and maintenance, and a large number of circuits (e.g., Motor Control Centers (MCCs) in industrial plants, large commercial complexes), withdrawable types like GCK, GCS, or MNS are preferable. For high-end projects or where specific brands are required, original series from international brands like ABB MNS, Siemens SIVACON, or Schneider Blokset are typically selected.

Medium-Voltage-Switchgear

Type Testing of Medium Voltage Switchgear According to IEC Standards

Type testing of medium voltage switchgear in accordance with IEC standards may involve two scenarios: First, testing at domestic accredited testing stations in compliance with the IEC 62271 series standards, resulting in test reports that conform to IEC 62271. Second, testing at international STL (Short-Circuit Testing Liaison) testing stations according to IEC standards and STL guidelines.

PV-Grid-Connected-Cabinet

Composition and Functions of a 400V PV Low-Voltage Grid-Connection Cabinet

A 400V PV Low-Voltage Grid-Connection Cabinet is a critical interface device that connects the photovoltaic (PV) power generation system to the low-voltage grid. It is a dedicated distribution panel integrating protection, monitoring, metering, and control functions. It is primarily composed of the following core components:

Switchgear

Selection Standards for Standard Parts in Switchgear

Switchgear requires the use of many fastening standard parts such as bolts, nuts, washers, and rivets. It is essential to select appropriate standard parts based on different applications to ensure functional requirements are met while enhancing product safety and cost-effectiveness.

Marine Switchgear

Medium Voltage Marine Switchgear Solution

Incoming Line Configuration: Marine switchgear systems are powered by multiple diesel generators operating in parallel. Each incoming line must be equipped with voltage transformers for accurate voltage measurement on the supply side.

Medium-Voltage Switchgear

Medium-Voltage Switchgear Retrofit Solutions

The typical service life of medium-voltage switchgear is approximately 20 years. After prolonged operation, various issues may arise, such as insulation aging, increased temperature rise, circuit breaker mechanism jamming, and loss of vacuum, all of which pose significant risks to continued operation. Replacing entire units requires substantial financial investment and time, whereas retrofitting offers a rapid solution to address safety hazards, revitalize the equipment, and ensure continued safe operation.

Medium-Voltage Switchgear

Common Voltage Ratings and Insulation Levels for Medium-Voltage Switchgear

Even for the same voltage level, different standards may require verification of both power frequency withstand voltage and lightning impulse withstand voltage. For instance, some regions like Southeast Asia and Australia require 11/12 kV switchgear with a power frequency withstand voltage of 28 kV but a lightning impulse withstand voltage of 95 kV. Standard domestic 12 kV switchgear cannot meet this requirement; enhanced insulation type, high-altitude type products, or using a higher-rated switchgear (e.g., 24 kV) to substitute for a lower one ("using a higher rating to cover a lower one") may be necessary.

Medium-Voltage Switchgear

Application of Wireless Communication in Medium-Voltage Switchgear

High-voltage electrical equipment carries voltages ranging from several thousand to millions of volts. These high voltages are conducted through busbars, which must be isolated from the ground and supported by non-conductive insulation components. In addition to the normal operating voltage, high-voltage systems are subject to switching overvoltages and lightning impulse overvoltages, which can be 3 to 8 times the operating voltage. Insulation components must therefore withstand both the normal operating voltage and these overvoltage conditions while maintaining insulation integrity.

Medium-Voltage Gas-Insulated Switchgear

Composition and Structure of Medium-Voltage Gas-Insulated Switchgear

Gas-insulated switchgear (GIS) primarily refers to a cabinet for housing switching devices, enclosed by a metal steel plate shell with doors or cover panels to allow access for installation and operation. The switchgear includes various components such as disconnectors, load switches, earthing switches, etc., each serving specific functions.

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Switchgea

Development Directions of Switchgear under New Quality Productive Forces

Enhancing development quality and transitioning from the previous extensive economic growth model to intensive, high-quality development are equally crucial for the evolution of switchgear. The switchgear industry suffers from severe homogenization, with low-quality products proliferating unchecked through simple repetition, competing solely on price and cost while neglecting quality. This approach consumes vast material resources without regard for sustainability, prioritizing short-term compliance over long-term reliability.

Marine Switchboard

Marine Switchboard Market Share Analysis and Development Trend Analysis

Conclusion: European players maintain short-term dominance in premium segments, but Chinese manufacturers are rapidly gaining ground through cost and scale advantages. Future competition will center on smart functionalities, green compatibility, and modular innovation, with technological agility determining market repositioning.

Switchgear

The market share of Chinese switchgear exported to Indonesia

China holds 60-70% of Indonesia's switchgear imports, led by cost-competitive LV/MV products. Key drivers: Indonesia's power demand growth (6-7%/year) and infrastructure projects. Challenges include local content rules (TKDN) and certification. Growth areas: renewables and smart grids. Chinese firms advance via tech upgrades and localized production.

Control-Switchgear

Chinese-Developed Intelligent Power Distribution Switchgear Debuts at Munich Event

Munich, Germany – From June 24th to 27th local time, the 27th Laser World of Photonics was held at Messe München. ShengLong Electric showcased its self-developed AI-iPanel, the world's first artificial intelligence power distribution switchgear, attracting significant attention from global professionals.

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