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Voltage limiter monitoring

A technology of voltage limiter and voltage, which is applied in the direction of instruments, measuring electronics, measuring devices, etc., which can solve the problems of sensitivity accuracy limitation, change, and increasing the complexity of known monitoring arrangements.

Active Publication Date: 2020-08-11
EATON INTELLIGENT POWER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sensitivity and also the accuracy of such known devices are disadvantageously limited, and when deployed in circuits such as control loops, the voltage will vary with the measured current
External power supplies are also used for such known monitoring arrangements / devices and this may prove a commercial limiting factor which increases the complexity of known monitoring arrangements

Method used

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  • Voltage limiter monitoring
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Embodiment Construction

[0046] As described below, figure 1 and 2 The operation of the embodiment of the invention shown in is in the context of a voltage limiting device in the form of a surge arrester, such as a surge arrester employed within a 4-20 mA analog input and output loop of a process control circuit arrangement. . This arrangement may allow battery power to be provided for digital input / output signals. It should be understood, however, that this is merely an illustration of one of many examples of the invention, and that the concepts behind the invention may be used in other configurations and indeed in various other circuit protection situations.

[0047] But the illustrated embodiment employing a 4-20 mA loop specifically illustrates the advantageous sensitivity and accuracy provided by the present invention. In such an example, the monitoring device may be arranged to indicate an erroneous current once the current flowing in the voltage limiting device exceeds a threshold value. Fo...

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PUM

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Abstract

The present invention provides for a circuit arrangement, and related method, for monitoring the operative state of a voltage-limiter device such as, for example, a surge arrester and in a manner to identify an error currents flowing there-through and which can prove indicative of deterioration in the state of the device and which proves particularly advantageous in providing or such monitoring even if only small error currents are likely, but in a manner which still allows for the required operation of the portage limiter device and for example during circuit protection against current surges.

Description

technical field [0001] The present invention relates to the monitoring of voltage limiting devices, and in particular to the monitoring of devices arranged to provide circuit protection against potentially damaging high voltage and / or current levels, such as for example inrush currents. Background technique [0002] Voltage limiting devices are often used to avoid undesired voltage levels within a circuit or specific equipment. In one arrangement described further below, the voltage limiter may comprise a circuit / equipment protection device, such as a surge arrester, arranged to absorb surge current (energy) to prevent the protected circuit from experiencing high voltages. In this way, the absorption of inrush current by the protection device limits the voltage developed in other parts of the circuit. That is, the device is typically triggered by the presence of a trigger voltage value at its terminals and then attempts to limit the voltage developed in the circuit by diver...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
CPCG01R31/1236H02H3/048
Inventor F·弗拉迪米尔 埃斯波西托 德 拉 托雷拉
Owner EATON INTELLIGENT POWER LTD