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Low-voltage distribution line distribution transformer three-phase unbalance protection method and device

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

Active Publication Date: 2016-05-18
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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  • Low-voltage distribution line distribution transformer three-phase unbalance protection method and device

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Embodiment Construction

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

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

[0057] S1: Monitor the low-voltage distribution lines, collect the three-phase current of the low-voltage distribution lines 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 neutral point current I respectively 0 ;

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

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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 relay protection of power systems, in particular to a three-phase unbalance protection method and device for distribution transformers of low-voltage distribution lines. Background technique [0002] With the acceleration of urbanization, the load power of the low-voltage distribution network (low voltage refers to the voltage below 1 kV) continues to increase, especially during the peak season of summer and the Spring Festival. in an overloaded state. Through the investigation and analysis of the annual distribution transformer damage in a certain area, it can be known that the three-phase imbalance is one of the main reasons for the distribution transformer damage. [0003] Three-phase unbalance: The relevant power standards stipulate that the three-phase load of the distribution transformer should be as balanced as possible, and one-phase or two-phase power supply should not be used. For distribution transform...

Claims

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Application Information

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Patent Type & Authority Applications(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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