High-Frequency Magnetic Core Transient Suppressor for Power Equipment
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Solution Overview
Problem
Existing solutions for suppressing very fast transients in electric power equipment, such as transformers in substations and wind power plants, are either inefficient, bulky, or prone to thermal destruction, and fail to adequately protect against high-frequency voltage surges due to limitations in impedance and power dissipation.
Innovation Solution
A device comprising a high-frequency magnetic core around a current-conducting lead with a winding and a damping resistor, which forms a closed electric circuit, effectively suppresses high-frequency transients by increasing impedance with frequency, allowing for compact design and reduced saturation, and can be integrated into existing switchgears without significant modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If varistor surge arrester is used to reduce transient amplitude, then the amplitude of very fast transients is reduced, but the rate of rise of voltage wave is not changed and additional high-frequency voltage components are generated
Solution Approach 1:
The patent changes the electrical parameters of the protective device by using a magnetic core with high frequency characteristics. The magnetic core's inductance increases with frequency, providing frequency-dependent impedance that reduces both transient amplitude and rate of rise, unlike varistors that only address amplitude.
Solution Approach 2:
The patent combines magnetic core material with winding and damping resistor to create a composite protective device. This composite structure provides both inductive reactance at high frequencies and resistive damping, achieving superior protection compared to single-material solutions like varistors.
2Object-affected harmful factors
If surge capacitors with large capacitance value are used, then protection against large amplitude interference is improved, but the dimensions and weights increase making placement difficult
Solution Approach 1:
The patent changes from capacitance-based protection to inductance-based protection. The magnetic core provides frequency-dependent inductance that achieves protection without requiring large capacitance values, thereby reducing the size and weight of the protective device.
Solution Approach 2:
The patent replaces the mechanical/electrical system of large surge capacitors with a magnetic field-based system using a magnetic core and winding. This substitution achieves the same protective function with significantly reduced dimensions and weight.
3Object-affected harmful factors
If pre-insertion resistors are connected in parallel with circuit breaker contacts, then protection against very fast transients is improved, but additional contacts are required and installation becomes difficult
Solution Approach 1:
The patent creates a multi-functional device where the magnetic core assembly serves both as a protective element and as an insulating bushing component. This universal design eliminates the need for separate pre-insertion resistors and additional contacts, simplifying installation.
4Object-affected harmful factors
If R-L reactors with specially selected parameters are used, then suppression of very fast transients is improved, but dimensions depend on current value and significant power dissipation during fault current can result in thermal destruction
Solution Approach 1:
The patent changes from R-L reactor parameters to magnetic core material properties. The magnetic core provides frequency-dependent inductance without requiring high current ratings, and the damping resistor is specifically designed to handle transient energy without thermal destruction during normal operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively reduces the amplitude and rate of rise of very fast transients, particularly in the range of hundreds of kHz to MHz, while maintaining low impedance at 50/60 Hz operating frequencies, and can be used in constrained spaces like wind power plants without thermal issues, enhancing protection and reducing the need for additional modifications.
Implementation Method 1
The magnetic core is made of magnetic material of high magnetic permeability
Implementation Method 2
a damping resistor, which forms a closed electric circuit, effectively suppresses high-frequency transients
Data Source
AI summary
A device for suppressing very fast transients, applicable in protecting electric and/or electric power equipment, and especially transformers operating in electric power substations and in wind power plants, connected in a supply network circuit downstream of a circuit breaker and upstream of the protected equipment is disclosed. The device is a component of an induction character, comprising a high-frequency magnetic core arranged around the current-conducting lead. On the magnetic core is wound at least one winding with at least one pair of terminals used for connecting at least one damping resistor. The inventive device contains an insulating body in which there is a magnetic core, a damping resistor and a winding, or an insulating body in which there is a magnetic core together with a damping resistor, a winding and a section of a current-conducting lead.