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Single bus sectional PT system and device for preventing reverse power transmission during PT overhaul

A single-bus segment and bus-bar technology, which is applied to circuit devices, electrical components, AC network circuits, etc., can solve problems such as low reliability

Pending Publication Date: 2018-08-10
HENAN SENYUAN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a single-bus subsection PT system to solve the problem of low reliability in the way of using software programs to realize PT data output

Method used

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  • Single bus sectional PT system and device for preventing reverse power transmission during PT overhaul
  • Single bus sectional PT system and device for preventing reverse power transmission during PT overhaul

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Effect test

Embodiment Construction

[0017] Embodiment of single-bus section PT system

[0018] This embodiment provides a single-bus section PT system, which is suitable for figure 1 In addition to the 10kV power distribution system shown, it is also applicable to power distribution systems of other voltage levels or other structures, such as with figure 1 Similar double bus system.

[0019] The single-bus segmented PT system includes two major parts, namely the PT part and the device for preventing reverse power transmission during PT maintenance. Among them, the PT part includes two PTs, namely the first PT and the second PT, and the first PT is figure 1 The Ⅰ bus PT in is the voltage detection equipment of the Ⅰ section bus, and the second PT is figure 1 The II bus PT in the figure is the voltage detection equipment for the bus section II, the I bus PT corresponds to the 1G switch, and the II bus PT corresponds to the 2G switch. The connection relationship between the primary side of I female PT and the pr...

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Abstract

The invention relates to a single bus sectional PT system and a device for preventing reverse power transmission during PT overhaul. A signal output line on a secondary side of a first PT is connectedin series with a first switch having the state same as that of a first PT corresponding knife gate, and a signal output line on a secondary side of a second PT is connected in series with a second switch having the state same as that of a second PT corresponding knife gate. When a certain PT needs to be overhauled, a PT parallel switch is closed, the knife gate corresponding to the overhauled PTis disconnected, a switch on the signal output line of the secondary side of the overhauled PT is also disconnected, a voltage signal of the other PT cannot be transmitted to the secondary side of theoverhauled PT, a primary side of the overhauled PT cannot induce generated high voltage, and therefore high voltage damage to overhaul personnel is avoided. It is ensured that the induced voltage isnot generated on the primary side and overhaul is safe. The circuit is simple, practical and reasonable in structure and wide in application range, meets operation safety, reliability and practicability and saves cost.

Description

technical field [0001] The invention relates to a single-bus section PT system and a device for preventing reverse power transmission during PT maintenance. Background technique [0002] In conventional substations, there are often two incoming lines, figure 1 It shows a common scheme of primary main circuit single bus section switch. 1QF means that the main transformer of Section I busbar enters the cabinet, 2QF indicates that the main busbar of Section II enters the cabinet, and 3QF is the bus tie switch. 1QF closing and 2QF closing respectively drive the load operation when the low-voltage power comes from the upper-level transformer; when 1QF or 2QF fails or opens, the 3QF bus tie switch needs to be closed to drive all the loads to run. The system is equipped with 2 PT cabinets to provide detection and protection voltage for the protection device of the corresponding section. like figure 1 As shown, the PT of bus I is the voltage detection equipment of bus section I,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00
Inventor 王静宁刘敏
Owner HENAN SENYUAN ELECTRIC CO LTD
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