Three-phase unbalance protection method and device for distribution transformer of low-voltage distribution line

A distribution transformer and low-voltage power distribution technology, which is applied in the directions of emergency treatment AC circuit layout, multi-phase network elimination/reduction of asymmetry, AC network voltage adjustment, etc., can solve distribution transformer aging, three-phase unbalance adjustment, adjustment The method can not wait for the problem to achieve the effect of prolonging the service life, slowing down the aging situation, improving safety and stability

Active Publication Date: 2018-06-26
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0009] The purpose of the present invention is to provide a three-phase unbalance protection method and device for distribution transformers of low-voltage distribution lines to solve the aging and damage of distribution transformers caused by three-phase unbalance, and the existing adjustment methods cannot be dynamic and efficient. The technical problem of three-phase unbalance adjustment

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  • Three-phase unbalance protection method and device for distribution transformer of low-voltage distribution line
  • Three-phase unbalance protection method and device for distribution transformer of low-voltage distribution line
  • Three-phase unbalance protection method and device for distribution transformer of low-voltage distribution line

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[0055] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0056] see figure 1 , the three-phase unbalance protection method of the distribution transformer according to the embodiment of the present invention includes the following steps:

[0057] S1: Monitor the low-voltage distribution line, collect the three-phase current of the low-voltage distribution line in real time, and obtain the actual power supply load;

[0058] S2: According to the actual power supply load and three-phase current of the low-voltage distribution line, calculate the distribution transformer load rate β and the neutral point current I respectively 0 ;

[0059] S4: When the distribution changes the load rate β and the neutral point current I 0 When the first judgment condition is satisfied, calculate the three-phase unbalance de...

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Abstract

The invention discloses a low-voltage distribution line distribution transformer three-phase unbalance protection method and device. The method comprises following steps: monitoring a low-voltage distribution line, acquiring three-phase current of the low-voltage distribution line in real time, and obtaining actual power supply load; calculating distribution transformer load rate [beta] and neutral point current I0 on the basis of the actual power supply load and the three-phase current of the low-voltage distribution line; when the distribution transformer load rate [beta] and the neutral point current I0 satisfying a first judging condition, calculating three-phase unbalancedness of the low-voltage distribution line distribution transformer; selecting corresponding risk pre-warning levels for processing the low-voltage distribution line three-phase load on the basis of the three-phase unbalancedness. The device comprises a monitoring acquiring module, a first calculation module, a second calculation module, and an execution module. By means of the method and device, the unbalancedness of three-phase current can be greatly reduced.

Description

technical field [0001] The invention relates to the field of power system relay protection, in particular to a three-phase unbalanced protection method and device for a distribution transformer of a low-voltage distribution line. Background technique [0002] The acceleration of urbanization construction has made the load power of the low-voltage distribution network (low voltage refers to the voltage below 1 kV) continue to increase, especially the seasonal low-voltage power load during the peak summer and the Spring Festival soars, resulting in long-term long-term growth of some distribution transformers. in overloaded operation. Through the investigation and analysis of the damage of distribution transformers in a certain area throughout the year, it can be seen that three-phase imbalance is one of the main reasons for the damage of distribution transformers. [0003] Three-phase unbalanced: The relevant power standards stipulate that the three-phase load of the distribu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/26H02J3/14
CPCH02J3/001H02J3/14H02J3/26Y02B70/3225Y02E40/50Y04S20/222
Inventor 唐海国冷华陈宏朱吉然龚汉阳张志丹李红青陈幸李大公
Owner STATE GRID CORP OF CHINA
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