Coal mine power grid line impedance estimation system and working method thereof

A line impedance and power grid technology, applied in non-electrical signal transmission systems, measuring resistance/reactance/impedance, signal transmission systems, etc., can solve problems such as errors, unreasonable calculation or estimation, unreasonable setting values, etc., and achieve convenient use , Guarantee data accuracy and high transmission efficiency

CN104198816AActive Publication Date: 2014-12-10TIANDI CHANGZHOU AUTOMATION +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-12-10

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Abstract

The invention provides a coal mine power grid line impedance estimation system. The coal mine power grid line impedance estimation system comprises a signal collecting device, a looped network access device, a network topology generating device, a data validity verification device and an impedance estimation device, wherein the signal collecting device is used for synchronously collecting and processing voltage and current signals of a coal mine power grid explosive-proof switch which is connected with the signal collecting device, the looped network access device is used for connecting the signal collecting device with the data validity verification device through an optical fiber Ethernet loop network, the network topology generating device is used for generating network topology information, the data validity verification device is used for performing synchronism and reasonability processing on collected data, and the impedance estimation device is used for estimating verified data by combination with the network topology information so as to figure out impedance of each line of a coal mine power grid. The working method mainly includes system synchronization timing, signal collection, validity judgment, impedance estimation and the like. By means of the coal mine power grid line impedance estimation system and the working method thereof, the credibility of estimation results of line impedance of the coal mine power grid can be improved, and scientific and reasonable supporting data can be provided for setting calculation of short-circuit protection in coal mine relay protection.
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Description

technical field

[0001] The invention relates to the technical field of power supply and distribution in coal mines, in particular to a coal mine grid line impedance estimation system and a working method thereof. Background technique

[0002] Electricity is the main driving force of today's coal mine production and occupies a pivotal position in coal mine production. Underground coal mines have harsh environmental conditions. Power supply lines and electrical equipment are easily damaged and short-circuit faults occur underground. Moreover, due to the presence of explosive gas and coal dust underground in coal mines, once a short-circuit fault occurs in the power supply line, it may also cause safety accidents such as explosions. Therefore, it is very important to prevent short-circuit accidents in coal mine power grids. At present, coal mines mainly prevent short-circuit accidents in coal mine power grids by setting short-circuit protection of coal mine power grid relays, ...

Examples

Embodiment 1）

[0025] See figure 1 , the coal mine power grid line impedance estimation system of this embodiment is mainly composed of a signal acquisition device, a ring network access device, a network topology generation device, a data validity verification device and an impedance estimation device.

[0026] The number of signal acquisition devices is determined according to the number of nodes to be tested in the coal mine power grid. The signal acquisition device is a 16-bit AD sampling device with clock synchronization function; the signal acquisition device is electrically connected to the two-way signal of the ring network connector; the signal acquisition device is electrically connected to the coal mine explosion-proof switch as the node to be tested when used; the signal acquisition device The ring network connector is electrically connected to the bidirectional signal of the data validity verification device through the optical fiber Ethernet ring network; after each signal acqu...