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Power line monitoring device

A technology for power grid monitoring and equipment, applied in the direction of power supply testing, electrical components, circuit devices, etc., can solve problems such as measurement and analysis devices not working

Inactive Publication Date: 2006-10-18
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage, however, is the need for an auxiliary voltage decoupled from the monitored supply network, which has to be wired, and the measuring and analyzing device cannot be operated if the auxiliary voltage is interrupted

Method used

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  • Power line monitoring device

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Embodiment Construction

[0009] Fig. 1 shows the schematic structure of the grid monitoring device of the present invention. The measuring and evaluating device M of the grid monitoring system is connected directly to the monitored three phases L1 to L3 of the power supply grid. A bridge circuit B is connected in parallel with the measuring and evaluating device M to the three phases L1 to L3. The structure of the bridge circuit B shown in FIG. 1 is composed of six rectifiers G1-G6, which convert the three-phase voltage into a pulsed DC voltage. The pulsed DC voltage is then input to the switching relay S. The switching relay S generates a regulated output voltage which is then introduced into the high voltage stage H. At the output of the high-voltage stage H there is then a differential voltage D which is so large that a measuring and evaluating device M of the network monitoring system can be supplied with power. An optical display device or a switching device A can then be provided on this meas...

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Abstract

The invention relates to a network monitoring device for monitoring a power supply network comprising at least three phases (L1, L2, L3), having a measuring and evaluating device (M), a bridge circuit (B) and a switching relay (S). Here the measuring and evaluating device (M) and the bridge circuit (B) are connected to the three phases (L1, L2, L3), and the bridge circuit (B) is connected to the switching relay (S) so that the switching relay (S) is The measuring and analyzing device (M) provides a regulated supply voltage.

Description

technical field [0001] The invention relates to a network monitoring device for monitoring a supply network comprising at least three phases, having a measuring and evaluating device, a bridge circuit and a switching relay. Background technique [0002] Grid monitoring devices, also known as grid monitoring relays, are currently used in automation technology to monitor three-phase power grids. In this case, grid monitoring devices of this type measure and evaluate parameters of the supply grid, such as voltage, current, phase sequence, or parameters derived therefrom, such as power, phase shift, asymmetry. If one of the parameters deviates from a defined setpoint value, the grid monitoring device must notify this error. [0003] Currently known grid monitoring devices generally function according to the so-called standstill current principle. This means that the signaling relay is introduced after the supply voltage has been applied. In the event of a fault or disconnecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/02G01R19/165G01R29/18H02H3/04H02H3/20H02H3/24H02H3/38H02M3/00H02M7/06
CPCG01R31/42G01R19/16538G01R19/2513G01R29/16G01R29/18
Inventor 罗兰·弗莱希曼彼得·哈姆森赫尔穆特·克劳斯马丁·梅尔康拉德·斯平德勒
Owner SIEMENS AG