Single-Pole Voltage Tester Integrator for DC AC Differentiation
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Solution Overview
Problem
Existing voltage testers for medium-voltage and high-voltage systems lack reliability in distinguishing between DC and AC voltages, posing safety risks, especially when two-pole DC testers are used on AC lines.
Innovation Solution
A single-pole voltage tester that uses an integrator device and evaluation system to detect both DC and AC voltages by storing threshold values for each type and employing a charge detector with a capacitor for pulse-shaped compensating currents, allowing safe and reliable voltage testing regardless of approach speed or contact method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-pole DC voltage tester is used on an AC line, then the tester can detect voltage presence, but it creates a safety risk due to potential short-circuit paths that could ignite high-energy arcs
Solution Approach 1:
The patent extracts the second pole connection that creates harmful short-circuit paths from the voltage testing function. By using a single-pole design with capacitive coupling, the invention eliminates the connecting wire to the second pole that could bridge high voltage and earth, thereby removing the source of arc ignition risk while maintaining voltage detection capability
Solution Approach 2:
The patent introduces an intermediary capacitive coupling mechanism between the voltage tester and the live part. Instead of direct galvanic connection, the test object is coupled capacitively to the contact electrode, which then connects to the evaluation unit. This intermediary approach prevents direct current flow through the tester while still allowing voltage presence detection
2Device complexity
If a single-pole voltage tester is used for DC systems, then the device design is simplified and safety is improved, but it cannot reliably distinguish between DC and AC voltages
Solution Approach 1:
The patent changes the measurement parameter from simple voltage detection to detection of voltage-dependent discharge characteristics. By measuring the discharge current through a known resistor and comparing it to threshold values, the system can distinguish between DC and AC voltages based on their different discharge behaviors, maintaining single-pole simplicity while achieving accurate voltage type differentiation
Solution Approach 2:
The patent replaces mechanical/electrical contact-based detection with an evaluation system that processes electrical signals. The evaluation unit analyzes the discharge current characteristics and compares them against stored threshold values for DC and AC voltages, using electronic evaluation rather than traditional electrical contact methods to achieve reliable voltage type identification
3Ease of operation
If the voltage tester uses capacitive coupling for DC voltage testing, then the approach speed and contact method do not matter, but the device must accurately integrate and evaluate electrical signals to distinguish voltage types
Solution Approach 1:
The patent implements preliminary action by pre-storing threshold values for DC and AC voltage discharges in the evaluation unit. Before actual voltage testing, the system is configured with the appropriate threshold criteria, enabling rapid signal evaluation without complex real-time analysis. This preliminary preparation allows the tester to quickly distinguish voltage types based on discharge current characteristics
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
Enhances safety by accurately differentiating between live and de-energized states in various voltage systems, preventing accidental use of two-pole testers on AC lines and ensuring reliable voltage testing across different nominal voltages.
Implementation Method 1
a charge detector with a capacitor for pulse-shaped compensating currents
Implementation Method 2
an integrator device (10) for integrating the electrical signal that changes when the contact electrode (4) is brought into contact with the part (2) under test
Implementation Method 3
discharges are selectively generated in the electrostatic or quasi-static field between two adjacent electrodes separated by an insulating material
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a device (1) for testing the presence of an electrical voltage on a potentially live part (2) of an electrical system, in particular a single-pole voltage tester for medium-voltage and/or high-voltage power supply networks, comprising a contact electrode (4) that can be brought into contact with the part (2) to be tested, and/or a coupling electrode that can be brought close to the part to be tested, characterized in that the device (1) has an integrator device (10) for integrating the electrical signal that changes when the contact electrode (4) is brought into contact or when the coupling electrode is brought close to the part, and that the integrator device (10) operates as a charge detector in which a compensating current flowing when the contact electrode (4) is brought into contact or when the coupling electrode is brought close to the part, can be stored in a charge storage device (18).and a working method for such a device (1).