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Control method of overload load-shedding for transformer or circuit

A line overload and control method technology, applied in the direction of AC network voltage adjustment, power network operating system integration, information technology support system, etc.

Active Publication Date: 2013-11-13
NR ELECTRIC CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention: to propose a control method for transformer or line overload and load shedding, to solve the problem of relatively accurate load shedding when the transformer or line is overloaded without knowing the load size, so as to ensure the safe and stable operation of the power grid

Method used

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  • Control method of overload load-shedding for transformer or circuit
  • Control method of overload load-shedding for transformer or circuit
  • Control method of overload load-shedding for transformer or circuit

Examples

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Embodiment Construction

[0033] Taking the substation with three transformers as an example, the wiring form of the substation is as follows: figure 2 As shown, one side of the three transformers is respectively connected to the 220kV double busbar through the circuit breaker and the isolation switch, and the other side is respectively connected to the 110kV double busbar through the circuit breaker and the isolation switch. The device collects the three-phase voltage of each transformer and the two-phase current of A and C in real time, and sets the overload setting value and control word for each transformer separately, and also sets the overload function hard pressure plate switch input, and the action logic is as follows: figure 1 As shown, it includes the following steps:

[0034] (1) Transformer overload starting condition

[0035] For 3 transformers, the device is designed with 3 independent starting elements:

[0036] I max ...

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Abstract

The invention relates to a control method of overload load-shedding for a transformer or a circuit, which is characterized in that: a plurality of independent overload action levels are classified according to different power, current and overload time-lag of the transformer or the circuit, each overload action level is provided with an independent power starting and returning constant value, an independent current starting and returning constant value and an independent time-lag starting and returning constant value; after each overload action level acts, the load is shed in different turns of actions; time-lag exists between every two turns of shedding actions, if the load is decreased to a normal level for a certain time-lag after one turn of load shedding, the overload action level is returned, and the load shedding is ended; and otherwise the next turn of load shedding is continued after the time-lag. Due to the adoption of the control method, the safe and stable running of the transformer or the circuit can be guaranteed, and at the same time minimal over-shedding is guaranteed under the situation that the size of the shed load is unknown.

Description

technical field [0001] The invention belongs to the control field of electric power automation technology, and in particular relates to a control method for substation transformer or line overload connection load shedding and a device adopting the method. Background technique [0002] At present, in some substations with heavy loads, due to the limitation of the capacity of primary equipment such as transformers or incoming lines, when a transformer or incoming line fault trips, the remaining transformers or lines will reach the thermal stability limit, and long-term operation will cause primary equipment In order to ensure the safe and stable operation of the equipment, there are two main control measures currently taken, one is to pre-control the load before the accident, and the other is to install a stability control device to cut the load when overloaded. Due to the limitation of the thermal stability limit of the primary equipment, the power transmission capacity can o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/14
CPCY02B70/3225Y04S20/222
Inventor 任祖怡夏尚学王良徐柯何强白杨常东旭
Owner NR ELECTRIC CO LTD
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