Automatic load switching and restoring method for overloaded circuit
A recovery method and overload technology, applied in the direction of circuit devices, AC network circuits, power network operating system integration, etc., can solve problems such as automatic dumping of overloaded distribution lines, and achieve safe and economical operation and extended operation The effect of reducing service life and reducing power outage accidents for users
Active Publication Date: 2014-12-10
STATE GRID CORP OF CHINA +1
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Problems solved by technology
[0003] The distribution network automation system can monitor the distribution line overload through the real-time data uploaded by the distribution network monitoring terminal. Automatic pouring out of load distribution line load
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[0037] Such as figure 1 Shown, the load of a kind of overloaded circuit of the present invention pours out and recovers automatically, and it comprises the following steps:
[0038] 1) Obtain real-time distribution line parameters, and periodically calculate the load rate of the distribution line, and the period for calculating the load rate of the distribution line is 2 minutes.
[0039] 2) Overload early warning, the overload early warning is based on the predefined distribution line overload reference value, when the distribution line overload is monitored, the distribution master station system generates a record with the distribution line as the unit, and send warning messages.
[0040] 3) Overload poured out. Such as figure 2 As shown, the step of pouring out from the overload includes the following steps;
[0041] 31) Determine the preparatory transfer source, the step of determining the preparatory transfer source is: obtain the switch with live and in divided sta...
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The invention discloses an automatic load switching and restoring method for an overloaded circuit. The automatic load switching and restoring method includes the steps of 1) acquiring a real-time parameter of a distribution line, and calculating a load rate of the distribution line in a periodical manner; 2) performing an overload alarm; 3) performing an overload switching; 4) performing an overload restoring. According to the arrangement, running state of the distribution line is periodically monitored, and an overloaded distribution line pre-alarm mechanism is started when the distribution line is monitored being in an overloaded state; when the distribution line is overloaded, the part of the load of the distribution line is switched to a light load line through an interconnection switch, thus the circuit runs commonly; after the load switched, at the premise that the line is protected from overload, a power supply manner, same as the power supply manner running before the load is switched, of the overloaded circuit is restored. In this way, automatic load switching of the overloaded distribution line is realized, safe and economical running of power equipment is guaranteed, service life of the power equipment is prolonged, and power failures, caused by overload of the distribution line, are fewer.
Description
technical field [0001] The invention relates to the technical field of distribution network fault processing, in particular to an automatic load dumping and recovery method for overloaded lines. Background technique [0002] The conventional protection used for distribution lines mainly includes miniature circuit breakers, molded case circuit breakers, and fuses to realize overload and grounding protection of distribution lines, and some important circuits, such as fire protection, medical treatment, security facilities, etc., suddenly lose power For lines with greater losses than overload, the overload protection should act on the signal rather than cut off the circuit. As a distribution line, the cause of overload is that the line current is too large, which leads to aging of the line, reduced insulation, and electric shock and fire accidents. [0003] The distribution network automation system can implement overload monitoring on the distribution line through the real-ti...
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IPC IPC(8): H02J3/00H02J3/14
CPCY02B70/3225Y04S20/222
Inventor 张营缄庄栋高同亮
Owner STATE GRID CORP OF CHINA