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Device and method for insulation monitoring in power supply systems

A technology of power supply system and equipment, which is applied in the direction of measuring electricity, testing circuits, measuring electrical variables, etc., and can solve problems such as inability to expand and monitor insulation symmetry loss

Active Publication Date: 2019-07-12
BENDER SA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method for insulation fault location has the disadvantage that, as a passive method, it cannot be extended to monitor symmetrical losses of insulation

Method used

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  • Device and method for insulation monitoring in power supply systems
  • Device and method for insulation monitoring in power supply systems

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Embodiment Construction

[0065] According to the present invention in figure 1 The device 2 for insulation monitoring and insulation fault location described in , comprises, as essential functional modules, a measurement signal generator 6 , an evaluation device 8 and two differential current measuring devices 10 and 12 . The device 2 is integrated into a branched three-phase power supply system 4 (HRG system), which in this exemplary embodiment consists of a main system 14 and a subsystem 16 . The neutral point of the main system 14 is connected to earth PE via a neutral point resistor 18 .

[0066] The measuring signal generator 6 generates the measuring voltage U via the neutral point resistor 18 mess And it is injected into the power supply system 4 as a voltage drop. The measuring signal generator 6 of the device 2 according to the invention can optionally have a function for adjusting the measuring voltage U mess The control unit 20 of the control unit 20, wherein, in the form of a common mod...

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Abstract

The invention relates to a device and a method for insulation monitoring in a power supply system consisting of a main system (which includes a neutral point grounded with high resistance via a neutral point resistor) and optionally at least one subsystem, wherein, The main system and the subsystem each have differential current measurement devices for recording differential currents. The basic idea of ​​the invention is based on feeding measurement signals into an optionally branched HRG system via an active measurement method, recording fault currents driven by the measurement signals in the output power feed to be monitored by means of differential current measurements, and The fault currents recorded in the evaluation equipment are used to determine the total insulation resistance of the supply system and to determine the partial insulation resistance of the main system and possibly subsystems. In addition, insulation monitoring equipment can be used to locate insulation faults.

Description

technical field [0001] The present invention relates to a device and a method for insulation monitoring in a power supply system consisting of a main system comprising a neutral point connected to high-resistance ground via a neutral point resistance and optionally at least one subsystem, Therein, the main system and the subsystem each have a differential current measuring device for recording the differential current. Background technique [0002] In order to ensure high availability and operational safety of the electrical power supply and to guarantee the safety of persons in the operating area of ​​the electrical installation, supply networks are widely used, in contrast to grounding network types, the active components of which are separated from the ground potential. In such supply networks, known as unearthed IT systems, active conductors can exhibit insulation faults without necessarily interrupting ongoing installation operations, because due to the ideally infinite...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R27/18
CPCG01R27/18G01R31/086G01R31/14G01R31/52
Inventor 迪特尔·黑克尔埃克哈德·布勒克曼布克哈德·毛赫特
Owner BENDER SA