Plasma Current Transformer Layout for Direct High-Voltage Measurement
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Solution Overview
Problem
Existing measurement techniques for alternating currents and high voltages of physical plasmas, particularly cold plasmas at atmospheric pressure, are inaccurate due to indirect measurement methods.
Innovation Solution
A measurement apparatus comprising a current transformer with a ring core and measurement winding, a cable guide for the high voltage line, a measurement resistor, and a measurement capacitance, allowing direct and accurate measurement of alternating currents and high voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If indirect measurement methods using separate voltage measuring heads and current transformers on the primary winding are used, then the measurement setup is simple, but the measurement precision deteriorates
Solution Approach 1:
The patent introduces a cable guide as an intermediary component that structurally couples the high voltage line to the ring core. This mediator ensures that the high voltage line passes through the center of the ring core in a defined arrangement, enabling both direct measurement of plasma parameters and maintaining measurement simplicity through the guiding structure
Solution Approach 2:
The patent combines multiple measurement functions into a single integrated setup. The current transformer with ring core and measurement winding simultaneously measures both the alternating current in the high voltage line and, through the cable guide arrangement, provides reference for alternating high voltage measurement, eliminating the need for separate measurement systems
2Measurement precision
If direct measurement of alternating currents and high voltages is implemented, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The ring core serves multiple functions simultaneously: it acts as the magnetic core for the current transformer to measure alternating current, provides a structural reference for the cable guide to define the high voltage line position, and enables both measurement functions through its central geometry. This multi-functionality achieves direct measurement without proportionally increasing device complexity
Solution Approach 2:
The cable guide creates a defined relative arrangement that establishes a reference potential relationship between the high voltage line and the ring core. This equipotential arrangement allows the measurement system to accurately reference the alternating high voltage while maintaining a simple structural configuration
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 apparatus provides a direct and accurate measurement of alternating currents and high voltages, enabling precise control and monitoring of physical plasmas, with the measurements being linear functions of the current and voltage amplitudes.
Implementation Method 1
A current transformer (12) having a ring core (42) and a measurement winding (16) on the ring core (42)... A first measurement alternating voltage (UIP,Mes) dropping over the measurement resistor (19) is a first strictly monotonic increasing function of an amperage of alternating currents (49) flowing through the high voltage line (4)
Implementation Method 2
A measurement capacitance (29) connected between a center tap (28) of the measurement winding (16) and a reference potential (3)... A second measurement alternating voltage (UUP,Mes) dropping over the measurement capacitance (29) is a second strictly monotonic increasing function of an amplitude of the alternating high voltage (UHV)
Data Source
AI summary
A measurement apparatus for alternating currents and voltages of a physical plasma ignited by applying an alternating high voltage from an alternating high voltage source to a plasma electrode via a high voltage line comprises a current transformer having a measurement winding on a ring core and a cable guide guiding the high voltage line through the ring core. A first measurement alternating voltage dropping over a measurement resistor connected between ends of the measurement winding is a first strictly monotonic increasing function of an amperage of the alternating currents flowing through the high voltage line. A second measurement voltage dropping over a measurement capacitance connected between a center tap of the measurement winding and a reference potential connector is a second strictly monotonic increasing function of an amplitude of the alternating high voltage applied to the plasma electrode with respect to a reference potential at the reference potential connector.