Input-Side Isolation for High-Voltage Test Systems

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Solution Overview

Problem

Existing mobile high-voltage transformer testing systems face limitations in test performance due to mass and axle load restrictions, as they require large filter transformers for load-side electrical isolation, making them non-roadworthy and inefficient.

Innovation Solution

Shifting electrical isolation to the input side of the static frequency converter, using chokes and star-connected grounded filter capacitors on the mains side, reduces the system's mass and allows for equivalent performance within legal mass and axle load limits, eliminating the need for a passive compensation unit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a large filter transformer is used for load-side electrical isolation, then interference suppression is improved, but the system mass exceeds road traffic licensing limits

Engineering Contradiction:

Improveinterference suppressionVSAvoidsystem mass

Core Design Contradiction:

Object-affected harmful factorsVSWeight of moving object

Solution Approach 1:

The patent inverts the conventional arrangement by moving the electrical isolation function from the load side to the input side of the static frequency converter. The mains-side transformer with electrostatic screen provides the isolation, while the filter device uses smaller capacitors connected to the isolated inputs, eliminating the need for a large load-side filter transformer and reducing overall system mass below road traffic limits

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces an intermediary mains-side transformer with electrostatic screen between the power supply and the static frequency converter. This intermediary provides electrical isolation and creates a potential-free interface, allowing the filter device to operate with smaller components while achieving the same interference suppression effect

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If test performance is increased, then measurement capability is improved, but the system mass exceeds legal axle load distributions

Engineering Contradiction:

Improvetest performanceVSAvoidsystem mass

Core Design Contradiction:

ProductivityVSWeight of moving object

Solution Approach 1:

By inverting the isolation architecture to the input side, the patent enables higher test performance without proportionally increasing mass. The mains-side transformer handles the isolation for the entire system, allowing the filter device to use smaller capacitors while still supporting higher power test configurations within road traffic mass limits

Inventive Principle:

Principle #13The other way round (Inversion)

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 configuration significantly enhances test performance while ensuring compliance with road traffic regulations, reducing overall mass and improving interference suppression, enabling more efficient partial discharge measurements.

Implementation Method 1

shifting electrical isolation to the input side of the static frequency converter

Methodology Applied

Scientific EffectElectrical isolation:

Implementation Method 2

using chokes and star-connected grounded filter capacitors on the mains side

Methodology Applied

Scientific EffectFiltering: Filter (electronic)

Implementation Method 3

static frequency converters have clear advantages in terms of dynamics, wear, weight and availability

Methodology Applied

Scientific EffectFrequency conversion:

Implementation Method 4

the respective outputs of the frequency converter are fed to a sine filter that acts as a low-pass filter

Methodology Applied

Scientific EffectLow-pass filtering: Filter (electronic)

Implementation Method 5

which has an electrostatic screen between its primary and secondary side

Methodology Applied

Scientific EffectElectrostatic shielding: Faraday Cage

Data Source

PatentEP2438450B1Device for testing high-voltage equipment

Publication Date: 2013.12.11 MASCHFAB REINHAUSEN GMBH

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AI summary

The present invention relates to a device for testing high-voltage equipment, particularly power transformers (15) or inductors. According to the invention, the required potential separation (11/1,11/2) for suppressing asymmetrical interferences is shifted to the input side (2) of the static frequency inverter (18,19,20), that is, to the grid side (4).