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Method for producing a fault signal and electric protective device

A fault signal, fault technology, applied in the direction of automatic disconnection of emergency protection devices, electrical components, emergency protection circuit devices, etc., can solve problems such as hindering the protection function of power supply network line segments

Inactive Publication Date: 2011-06-08
SIEMENS AG
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  • Abstract
  • Description
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Problems solved by technology

[0010] Furthermore, in the case of established internal faults superimposed by oscillations, in particular when they occur at a great distance from the measuring location of the protective device (for example near the so-called "Kippgrenze, switching boundary", i.e. and external faults), also has the typical characteristic of oscillation, so that the oscillation signal also leads to hinder the protection function of the directly monitored supply network line segment

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  • Method for producing a fault signal and electric protective device
  • Method for producing a fault signal and electric protective device
  • Method for producing a fault signal and electric protective device

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Embodiment Construction

[0040] figure 1 A section 10 of a three-phase power supply network, not shown in detail, is shown by way of example. The segment 10 of the power grid is fed with electrical energy via the generator 12 . Between the generator 12 and the busbar 11 there is a schematically represented three-phase transmission line 13 . The power line 13 has circuit breakers 14 a and 14 b , by means of which the power line 13 can be disconnected from the rest of the section 10 of the power supply network.

[0041] In order to monitor the power line 13 for possible faults, such as short circuits or ground faults, protective devices 15 a and 15 b are provided, which are so-called distance protective devices. Protective devices 15 a and 15 b record measured values ​​at measuring points 16 a and 16 b in the form of current and voltage measured values ​​and determine permissible or impermissible operating states on power line 13 on the basis of these measured values. The detailed operating principle...

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Abstract

The invention relates to a method for producing a fault signal, which indicates a single-pole or a double-pole fault in a three-phase electrical power grid which occurred during a present electric oscillation in the electrical power grid. In order to provide a possibility by which single-pole or double-pole faults occurring during oscillation can be detected with high reliability, according to the invention a symmetry signal is produced during the oscillation, which indicates whether the oscillation is symmetrical or unsymmetrical, and the phases of the electrical power grid are checked for an existing fault, wherein the symmetry signal is used for carrying out the check. The fault signal is produced if a fault was detected during the check. The invention further relates to a protective device comprising an accordingly equipped control unit.

Description

technical field [0001] The invention relates to a method for generating a fault signal indicating a one-pole or two-pole fault in a three-phase power supply network, which fault occurs during the occurrence of electrical oscillations in the power supply network. The invention also relates to an electrical protection device for monitoring a power supply network. Background technique [0002] The supply network is usually monitored section by section for impermissible operating states, such as short circuits or ground faults, by means of so-called protective devices. When such an impermissible operating state occurs, the protective device disconnects the faulty part of the power supply network from the rest of the power supply network by opening the corresponding circuit breaker and thus avoids danger to persons and components of the power supply network. In order to monitor the individual line segments of the supply network, the protection devices execute so-called protectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/40H02H1/04
CPCH02H1/04H02H3/40H02H3/05
Inventor 伊尔马兹.耶尔金
Owner SIEMENS AG
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