Line Post Sensor Parallel Resistor Surge Protection
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Solution Overview
Problem
Existing line post sensors in high voltage power transmission systems are prone to damage from voltage surges such as those caused by switching or lightning, leading to premature failure due to excessive stress on high resistance resistors, which results in inaccurate readings and reduced sensor lifespan.
Innovation Solution
The implementation of a line post sensor design featuring a high voltage high resistance circuit with multiple resistors in parallel, reducing inductance and phase errors, and a serpentine pattern to distribute transient over-voltages evenly, coupled with a low voltage low resistance circuit to provide accurate voltage measurements while minimizing stress on the resistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single high resistance resistor is used in the voltage divider circuit, then the sensor can provide voltage measurement capability, but the resistor is susceptible to damage from voltage surges leading to premature failure
Solution Approach 1:
The single high resistance resistor is divided into multiple resistors connected in parallel. This segmentation distributes the voltage surge stress across multiple components, preventing any single resistor from bearing the full burden of transient over-voltages, thereby improving reliability and lifespan.
Solution Approach 2:
The parallel resistor configuration acts as a protective cushion against voltage surges before they can damage the sensing circuit. The distributed resistance network absorbs and dissipates surge energy, providing beforehand protection against harmful voltage transients.
2Reliability
If multiple resistors are used in parallel to reduce surge damage, then the reliability improves, but the circuit complexity increases
Solution Approach 1:
Multiple resistors are merged into a single functional unit within the voltage divider circuit. While physically multiple components are used, they operate collectively as one integrated sensing element, maintaining circuit simplicity while achieving enhanced reliability through parallel configuration.
3Measurement precision
If high resistance resistors are used to divide voltage for sensing, then voltage measurement is enabled, but inductance and phase errors are introduced affecting measurement precision
Solution Approach 1:
The single high resistance element is segmented into multiple parallel resistors, which reduces the overall inductance of the voltage divider circuit. This segmentation minimizes inductive effects and associated phase errors, thereby improving voltage measurement precision while maintaining the necessary voltage division capability.
Data Source
AI summary
A high voltage line post sensor for a high voltage power distribution system having a high voltage power transmission line for transmitting electrical power at a high voltage includes a voltage line sensor. The voltage line sensor includes a high voltage high resistance circuit including a first high voltage high resistance resistor coupled to the high voltage power transmission line and a second high voltage high resistance resistor coupled to the high voltage power transmission line in parallel to the first resistor; and a low voltage low resistance circuit coupled in series between the high voltage high resistance circuit and a reference voltage. The line post sensor also includes a body surrounding and encasing the high voltage high resistance circuit and the low voltage low resistance circuit.