Contactless on-load automatic positive and negative voltage regulating tap switch device for three-phase distribution transformer

A technology of distribution transformers and tap changers, which is applied to the parts of transformers/inductors, transformers, electronic switches, etc. It can solve problems such as low withstand voltage, power outage of transformers, and small range of non-contact voltage regulation to achieve withstand voltage Low, large adjustment range effect

Active Publication Date: 2016-08-03
NORTHEAST AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention aims to solve the problem that the non-contact on-load voltage regulation range is small due to the low withstand voltage of the existi

Method used

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  • Contactless on-load automatic positive and negative voltage regulating tap switch device for three-phase distribution transformer
  • Contactless on-load automatic positive and negative voltage regulating tap switch device for three-phase distribution transformer
  • Contactless on-load automatic positive and negative voltage regulating tap switch device for three-phase distribution transformer

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specific Embodiment approach 1

[0060] Specific implementation mode one: refer to figure 1 , figure 2 , Figure 12 to Figure 17 Specifically explain this embodiment, a non-contact on-load automatic positive and negative voltage regulation tap changer device for a three-phase distribution transformer described in this embodiment, each phase winding of the distribution transformer to be voltage regulation includes a Basic working winding W0, one regulating winding W1 and one regulating winding W2,

[0061] The non-contact on-load automatic positive and negative voltage regulation tap changer device includes an isolation transformer T, a monitoring and control system 1, a three-phase trigger unit 2, a fault alarm unit and a three-phase voltage regulation circuit;

[0062] A regulating winding W1 and a regulating winding W2 are a set of windings with taps,

[0063] The three-phase voltage regulation circuits are all the same, and the A-phase voltage regulation circuit is taken as an example for illustration....

specific Embodiment approach 2

[0085] Specific implementation mode two: refer to Figure 4 Describe this embodiment in detail. This embodiment is a further description of a non-contact on-load automatic forward and reverse voltage regulating tap changer device for a three-phase distribution transformer described in the first embodiment. In this embodiment , the monitoring and control system 1 includes a voltage detection circuit 1-1, a No. 1 single-chip microcomputer control system 1-2, a voltage zero-crossing detection circuit 1-3 and a No. 1 power supply 1-4,

[0086] Fault alarm unit 3 comprises No. two power supply 3-1, No. two single-chip microcomputer control system 3-2 and SIM800 communication module 3-3,

[0087] The two output terminals of the first secondary coil of the transformer T are connected to the input terminal of the voltage detection signal of the voltage detection circuit 1-1, and the voltage signal output terminal of the voltage detection circuit 1-1 is connected to the voltage of the ...

specific Embodiment approach 3

[0092] Specific implementation mode three: refer to Figure 5 Describe this embodiment in detail. This embodiment is a further description of a non-contact on-load automatic forward and reverse voltage regulating tap changer device for a three-phase distribution transformer described in the second embodiment. In this embodiment , the No. 1 power supply 1-4 is realized by the chip model L7805 and the chip model LM2576, wherein, the linear power supply circuit composed of the chip model L7805 supplies power for the No. 1 single-chip microcomputer control system 1-2 and the fault alarm unit 3, and the model The switching circuit composed of the LM2576 chip provides power for the optocoupler group in the trigger unit 2 .

[0093] In this embodiment, the linear power supply circuit composed of L7805 in the No. 1 power supply supplies power to the chip on the monitoring board and the fault control board. Since the maximum supply current required by the optocoupler group in the trigg...

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Abstract

The invention discloses a contactless on-load automatic positive and negative voltage regulating tap switch device for a three-phase distribution transformer and relates to the technical field of electric engineering. The problems that the contactless on-load voltage regulating range is small and power supply reliability is poor due to the fact that an existing power electronic element is low in voltage resistance can be solved. An antiparallel thyristor is used as a switching tap switch device, on-load voltage regulation is carried out in a positive and negative voltage regulation mode, a low-voltage air switch is used as a circulating current protecting device, and on-off of the tap switch is controlled through a monitoring and control system and a trigger unit. When the tap switch breaks down, an air switch trips out, a fault current is cut off, meanwhile, a power source of an isolation transformer is cut off, the on-load voltage regulating function exits, and the distribution transformer is automatically recovered to a rated tap to continue to supply power to a user; meanwhile, a fault alarm unit automatically sends a short message to a transformer manager through a mobile communication network to inform the transformer manager that the on-load automatic positive and negative voltage regulating tap switch is in the abnormal operation stage, and therefore fault removal is carried out at the right moment. The contactless on-load automatic positive and negative voltage regulating tap switch device is used for a power distribution system.

Description

technical field [0001] The invention relates to a non-contact on-load automatic forward and reverse voltage regulating tap changer for three-phase power distribution transformers. It belongs to the technical field of electrical engineering. Background technique [0002] It is an effective measure to stabilize the output voltage of distribution transformers within a certain range by using power electronic components as tap-changers, under the control of computers or single-chip microcomputers, and DSP, to carry out on-load voltage regulation of distribution transformers. Because the power electronic components have fast action, there is no arc generated when changing the working tap for on-load voltage regulation, so it can operate frequently and have a long service life, especially suitable for distribution transformers that need to frequently adjust the tap. However, due to the limitation of the withstand voltage value of power electronic components, if each tap is connect...

Claims

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Application Information

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IPC IPC(8): H01F29/04H01F27/40H03K17/72
CPCH01F27/402H01F29/04H01F2027/408H03K17/72
Inventor 赵玉林牛泽晗赵琦
Owner NORTHEAST AGRICULTURAL UNIVERSITY
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