Control method of overload load-shedding for transformer or circuit

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

Active Publication Date: 2012-02-15
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 relative

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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Example Embodiment

[0033] Take a 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 connected to a 220kV double bus through a circuit breaker and an isolating switch, and the other side is connected to a 110kV double bus through a circuit breaker and an isolating switch, respectively. The overload combined cutting method of the present invention is adopted. The device collects the three-phase voltage and the two-phase current of A and C of each transformer in real time, and sets the overload fixed value and control word for each transformer separately. At the same time, it also sets the overload function hard pressure board input, and the action logic is as figure 1 As shown, it includes the following steps:

[0034] (1) Transformer overload starting conditions

[0035] For 3 transformers, the device has designed 3 independent starting components:

[0036] I max i ≥ Iqdzdi | P...

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PUM

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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 field of electric power automation technology control, and in particular relates to a control method for substation transformer or line overload and load shedding and a device adopting the method. Background technique [0002] At present, in some heavy-loaded substations, 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 adopted. 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. Control measures, due to the limitation of the thermal stability limit of the primary equipment, the power transmission capacity c...

Claims

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Application Information

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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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