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VT (Voltage Transformer ) Protection RelayRear View
Comprehensive Protection Relay: Full Analysis​
A comprehensive protection relay is an intelligent device that safeguards electrical systems by detecting faults (e.g., overcurrent, short circuits) and isolating affected equipment. It integrates multiple protection functions, ensures system reliability, and prevents damage. This guide covers its definition, working principle, protection targets, activation conditions, and outcomes.
2025/07/18
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.
2025/07/17
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.
2025/07/16
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.
2025/07/15
technical knowledge More
Protection relay
Impact of Neutral Grounding on Protection: Small vs. Large Current Grounding System Selection
Examines how neutral grounding methods (small current: ungrounded/arc suppression coil vs. large current: directly/low-resistance grounded) affect protection: fault handling logic, configuration, sensitivity, and safety. Details selection criteria: power supply reliability requirements, voltage class, capacitive current, safety considerations, overvoltage limits, and protection complexity.
2025/07/21
GWZC-9871 Bus Tie Protection & Control Relay
Voltage Retransfer vs. Voltage Paralleling
Voltage retransfer isolates and selectively routes secondary voltage signals based on primary switchgear status, preventing backfeeding/short-circuit risks. Voltage paralleling temporarily connects two VT circuits during busbar physical interconnections or VT maintenance, ensuring continuous voltage supply. Both mechanisms are vital for secure substation operations.
2025/07/21
Protection relay
Function, Operating Principle, and Setting Calculation of Definite Time Overcurrent Protection
I. Purpose of Definite Time Overcurrent Protection         Backup Protection Core Function: Serves as backup for primary protection systems (e.g., differential, distance protection), operating reliably when primary protection fails or circuit breakers malfunction.         Fault Coverage: Clears phase-to-phase short-circuit faults and severe overloads on protected lines and adjacent equipment (e.g., transformers, busbars).         Equipment Security: Prevents thermal stability failure or insulation degradation caused by sustained fault currents.         Selectivity Assurance: Achieves precise fault isolation through graded time coordination, avoiding over-tripping.
2025/07/19
High Voltage Shore Connection Cabinet
High Voltage Shore Connection (HVSC) Box: Maintenance and Management Considerations
HVSC boxes are critical equipment providing high-voltage electrical power to berthed vessels. Their safe and reliable operation is paramount. Maintenance and management encompass safety, technical, operational, and documentation aspects. Key considerations are outlined below:
2025/07/19
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