Earthing Switch Operating Unit With Mechanical Status Indication
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Solution Overview
Problem
Existing earthing switch drive operating units for air-insulated switchgear are often bulky and expensive, and lack reliable status indication for maintenance personnel, posing safety risks due to reliance on auxiliary voltage for status displays.
Innovation Solution
A compact operating unit with a rotatable shaft, radial pins, and stops that define end positions, integrated with a mechanical status indicator, allowing manual operation and reliable status indication without auxiliary power, utilizing sheet metal components for cost-effectiveness and space efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional operating unit with separate components for shaft positioning and status indication is used, then the status indication can be provided, but the device becomes bulky and expensive
Solution Approach 1:
The patent combines the shaft positioning mechanism (pin and stops) with the status indication mechanism into a single integrated operating unit. The pin that defines the shaft's end positions also directly actuates the status indicator, eliminating the need for separate components and reducing overall device complexity while maintaining reliable status indication.
Solution Approach 2:
The pin serves multiple functions: it defines the shaft's rotational end positions, limits the shaft's rotation range, and simultaneously actuates the status indicator to display the shaft position. This multi-functionality reduces the number of components needed and simplifies the operating unit's structure.
2Reliability
If an auxiliary power supply is used for status indication, then the status can be displayed, but the system becomes dependent on auxiliary voltage which may fail
Solution Approach 1:
The status indicator is actuated directly by the mechanical movement of the pin and shaft, without requiring any external power supply. The system uses its own operational movement (shaft rotation) to automatically update the status indication, making it independent of auxiliary voltage and ensuring reliable operation even when power is unavailable.
3Volume of moving object
If a compact operating unit design is used, then space is saved, but the manufacturing cost and complexity may increase
Solution Approach 1:
The operating unit is divided into simple, modular components: a shaft with radially extending pins, separate stops for positioning, and a status indicator mechanism. This segmentation allows each component to be manufactured independently using simple processes, then assembled together, maintaining ease of manufacture while achieving a compact overall design.
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
The solution enables safe and cost-effective manual operation of earthing switches with reliable status indication, independent of auxiliary power, enhancing occupational safety and reducing the operational complexity and cost of air-insulated switchgear.
Implementation Method 1
The first stop (8) and the second stop (9) are arranged relative to the shaft (3.1, 3.2) in such a way that the shaft (3.1, 3.2) moves between a first shaft position, in which the at least one pin (6) strikes the first stop (8), and a second shaft position, in which the at least one pin (6) strikes the second stop (9)
Implementation Method 2
the shaft also has at least one pin which extends radially away from the shaft. In addition, the operating unit has a first stop and a second stop for the at least one pin... an eccentric for transmitting a rotary movement of the shaft to the earthing switch drive
Implementation Method 3
at least one shaft which is rotatably mounted in a bearing
Data Source
Figure 1
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AI summary
The invention relates to an operating unit (1) for an earthing switch actuator (17) of an air-insulated switchgear and an air-insulated switchgear assembly with such an operating unit (1). The operating unit (1) has at least one shaft (3.1, 3.2) rotatably mounted in a bearing (2), which has at a first end a socket (4) for a hand-operated crank and at a second end an eccentric (5) for transmitting a rotary movement of the shaft (3.1, 3.2) to the earthing switch actuator (17). According to the invention, the shaft (3.1, 3.2) also has at least one pin (6) extending radially away from the shaft (3.1, 3.2). Furthermore, the operating unit (1) has a first stop (8) and a second stop (9) for the at least one pin (6). The first stop (8) and the second stop (9) are arranged relative to the shaft (3.1, 3.2) such that the shaft (3.1, 3.2) is rotatable between a first wave position in which the at least one pin (6) strikes the first stop (8) and a second wave position in which the at least one pin (6) strikes the second stop (9).