Signal Cable Compensation for Voltage Sensor Frequency Response
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Solution Overview
Problem
Existing voltage sensors in medium-voltage or high-voltage power distribution networks require frequency response compensation, which is typically achieved by mounting compensating capacitors directly onto a printed circuit board (PCB) of the sensored insulation plug, necessitating different PCBs for signal cables of varying lengths, leading to inefficiencies and increased costs.
Innovation Solution
A signal cable with a compensating assembly including discrete compensating capacitors that can be electrically connected in parallel to the PTC resistor of the sensored insulation plug, allowing for frequency response compensation without the need for modifying the PCB, thus accommodating cables of different lengths with a single sensored insulation plug design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compensating capacitors are mounted directly onto the PCB of the sensored insulation plug, then frequency response compensation is achieved, but different PCBs are needed for signal cables of different lengths, increasing device complexity and manufacturing costs
Solution Approach 1:
The compensating capacitor is separated from the PCB and placed in a discrete component housing that can be independently selected and connected via connector. This segmentation allows the capacitor value to be changed without replacing the entire PCB, thus reducing device complexity while maintaining frequency response compensation.
Solution Approach 2:
A connector is introduced as an intermediary component between the PCB and the compensating capacitor. This connector allows for easy replacement and reconfiguration of capacitor values based on signal cable length, eliminating the need for multiple PCB designs while maintaining proper frequency compensation.
2Reliability
If compensating capacitors are mounted directly onto the PCB, then frequency response compensation is achieved, but manufacturing costs increase due to the need for different PCBs for different cable lengths
Solution Approach 1:
By separating the compensating capacitor from the PCB into an independent replaceable component, the manufacturing process can use a single standardized PCB design for all cable lengths. Only the inexpensive discrete capacitor needs to be changed, significantly reducing manufacturing costs compared to producing multiple PCB variants.
Solution Approach 2:
The capacitor value parameter is made variable through the use of replaceable discrete components rather than fixed PCB-mounted capacitors. This allows the same PCB to be used across different applications by simply changing the capacitor value to match the signal cable length requirements.
3Measurement precision
If the compensating capacitor value is changed for different signal cable lengths, then frequency response compensation is optimized, but the need to modify the PCB or capacitor increases device complexity
Solution Approach 1:
The connector serves as an intermediary that simplifies the configuration process. Different capacitor values can be selected and connected to the same PCB through the connector interface, optimizing frequency response for different cable lengths without increasing overall device complexity.
Solution Approach 2:
Multiple capacitor values are available as discrete copy components that can be selected based on the specific application requirements. This allows optimal frequency compensation to be achieved for different cable lengths without modifying the core PCB design or increasing system complexity.
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 enables cost-effective manufacturing of identical sensored insulation plugs for various cable lengths, maintaining adequate frequency compensation and reducing the need for PCB modifications, thereby enhancing efficiency and cost-effectiveness.
Implementation Method 1
The frequency response of the sensored insulation plug with the PTC resistor at its output generally depends on a capacitor value of a compensating capacitor connected in parallel to the PTC resistor. This compensating capacitor is used for the frequency response compensation.
Implementation Method 2
This may be due to a positive temperature coefficient (PTC) resistor, mounted for example on a printed circuit board (PCB), of the sensored insulation plug. The PTC resistor may be needed for temperature compensation purposes.
Data Source
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AI summary
A signal cable (210) for conducting a sensor signal received from a voltage sensor (300) of a sensored insulation plug (1) for being inserted into a rear cavity (70) of a medium-voltage or high-voltage separable connector (10) in a power distribution network of a national grid, and operable to insulate a connection element (80) of the separable connector (10) on an elevated voltage and to sense the elevated voltage. The signal cable (210) includes a connector (211). The connector (211) is adapted to be mechanically and electrically connected to the voltage sensor (300) of the sensored insulation plug (1). The signal cable (210) further includes a compensating assembly (310) including one or more discrete compensating capacitors (311) and the connector (211) is adapted to electrically connect the compensating assembly (310) to the voltage sensor (300) of the sensored insulation plug (1).