Voltage Measurement Correction for Single Pole Transformers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing voltage measurement systems using single pole insulated voltage transformers with three windings face inaccuracies due to non-idealities, requiring additional components like current transformers and impedances to compensate for voltage drops, which complicates the transformer structure.
Innovation Solution
A method for voltage measurement that corrects secondary voltages measured from the secondary windings of three single pole voltage transformers by applying adjustments based on parameters of the transformers, external wiring, and burdens, without altering the transformer structure, using a processor and memory to execute these corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional current transformers and impedance components are added to compensate for voltage drops, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the measurement process through computational correction factors rather than physical hardware modifications. Correction factors are calculated based on transformer parameters (winding resistances, leakage reactances, turns ratios) and operating conditions (load currents, voltages) to adjust the measured secondary voltages and compensate for voltage drops, thereby improving measurement accuracy without adding physical components.
Solution Approach 2:
The patent replaces the mechanical/electrical compensation system (physical current transformers and impedance components) with a computational system. Instead of using additional hardware to physically compensate for voltage drops, the invention uses digital signal processing and mathematical calculations to correct measurement errors, substituting electronic computation for electrical hardware compensation.
2Measurement precision
If correction factors based on transformer parameters and operating conditions are applied, then measurement accuracy is improved, but calculation complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction factors based on transformer parameters and typical operating conditions. These correction factors are determined in advance and can be looked up or interpolated during operation, avoiding the need for complex real-time calculations while still achieving accurate compensation for voltage drops and measurement errors.
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
This approach provides more accurate primary voltage determination by accounting for transformer and external circuit parameters, improving measurement accuracy without requiring additional hardware, thus simplifying the system and enhancing precision.
Implementation Method 1
single pole insulated voltage transformers each respectively having a primary winding, a secondary winding and a tertiary winding... when a primary voltage is applied to the primary winding 20, the secondary windings 30, 40 produce secondary voltages that depend on the primary voltage and a turns-ratio
Data Source
AI summary
A method and an arrangement for voltage measurement with a transformer configuration comprising three single pole voltage transformers having tertiary windings open-delta connected with each other. The arrangement is configured to apply a correction to measured secondary voltages on the basis of one or more parameters of the voltage transformers and/or one or more quantities in a known relation to one or more parameters of the voltage transformers, one or more parameters of a circuit connected to the secondary windings and/or one or more quantities in a known relation to one or more parameters of the circuit connected to the secondary windings, and one or more parameters of a circuit connected to the tertiary windings and/or one or more quantities in a known relation to one or more parameters of the circuit connected to the tertiary windings.