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Ring differential protection method and device for distribution network

A differential protection device and differential protection technology, applied in the field of power grid, can solve the problems of large power failure area and long time, and achieve the effect of reducing power failure area, fast action speed and high reliability

Inactive Publication Date: 2019-01-11
NANJING FENGDAO POWER TECH
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Problems solved by technology

[0002] With the gradual advancement of the national smart grid construction work and the gradual development of the decentralized distribution network access mode, the new distribution network operation structure and protection control technology are urgent tasks to improve the reliability and power quality of distribution network power supply. Network reliability is an important indicator to measure the power supply level of an area. When a fault occurs, the power outage area is large and the time is long.

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  • Ring differential protection method and device for distribution network
  • Ring differential protection method and device for distribution network
  • Ring differential protection method and device for distribution network

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Embodiment Construction

[0044] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0045] Such as figure 1 As shown, a distribution network ring differential protection method, including the following steps:

[0046] Step 1: Deploy the DTU device on the distribution substation in the substation, and each DTU device is connected in a ring through Gigabit optical fiber, and configure the parameters of the DTU device; that is, the deployment of the MB1, MB2MB3MB4 distribution station on the 1# substation corresponds to The ring type differential DTU device. Each DTU device is connected in a ring through Gigabit optical fiber, as shown in the dotted line in the figure, and the DTU device is not sho...

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Abstract

The invention discloses a ring differential protection method and device for distribution network, which relates to the technical field of power network. The ring differential DTU device is arranged on a distribution station in a substation, and each DTU device is ring-connected through a gigabit optical fiber. The voltage and current data are sampled by a DTU device, and then a message is formedand sent out; Each DTU device sends the sampled value of the tie line and its own state information through the optical fiber ring network, and simultaneously receives the sampled value and the stateinformation of the equipment subscribed by the DTU device. When the launching fault occurs between two substations, the differential algorithm is used to trigger the differential action, and the circuit breaker of the two substations is disconnected and the fault is removed. A DTU device is use for collecting real-time data of whole line and establishing relay protection by utilizing line currentdifferential protection. That invention has the advantages of high reliability, fast operation speed, high sensitivity and good selectivity, thereby reducing power-off area and shortening power-off time.

Description

technical field [0001] The invention relates to the technical field of power grids, and more specifically relates to a ring differential protection method and device for a distribution network. Background technique [0002] With the gradual advancement of the national smart grid construction work and the gradual development of the decentralized distribution network access mode, the new distribution network operation structure and protection control technology are urgent tasks to improve the reliability and power quality of distribution network power supply. Network reliability is an important indicator to measure the power supply level of a region. When a fault occurs, the power outage area is large and the time is long. Contents of the invention [0003] The technical problem to be solved by the present invention is that when a short-circuit fault occurs in the existing distribution network, the blackout area is large and the time is long. [0004] The present invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/26H02H7/263
Inventor 刘家严王峰蔡德胜
Owner NANJING FENGDAO POWER TECH
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