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Grounding-free direct lightning protector for three-phase power-supply system

A three-phase power supply and protector technology, which is used in emergency protection circuit devices, emergency protection circuit devices, electrical components, etc. for limiting overcurrent/overvoltage, which can solve the problem that the lightning voltage cannot be guaranteed to be less than 300 volts and cannot be reliable. It can reduce the cost of grounding and improve reliability.

Inactive Publication Date: 2012-01-25
HANGZHOU BILEI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0037] From the above comparison, it can be seen that 200820120204.9 can guarantee the protection and safety requirements of the induced lightning strike under the simple grounding condition, but cannot guarantee the requirement that the output duration of the lightning voltage is less than 300 volts for more than milliseconds, and it does not affect the direct lightning strike introduced by the power supply system. reliable protection

Method used

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  • Grounding-free direct lightning protector for three-phase power-supply system
  • Grounding-free direct lightning protector for three-phase power-supply system
  • Grounding-free direct lightning protector for three-phase power-supply system

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Embodiment 1

[0058] see Figure 8 , a direct lightning strike protector for a three-phase power system without grounding, made of zinc oxide element BL 1 、BL 2 、BL 3 、BL 4 、BL 5 、BL 6 、BL 7 constituted where the ZnO element BL 1 、BL 2 、BL 3 、BL 4 For T-T mode SPD, BL 4 、BL 5 、BL 6 、BL 7 For T-N mode SPD, the three input ports of the three-phase isolation transformer are connected to the three phase line ends of the output ports connected by T-T and T-N, and the neutral line N is connected to the neutral line (the input and output can be zero or not according to the actual situation. Zero), the isolation winding of the isolation transformer is connected to the ground terminal PE, if BL is selected 1 、BL 2 、BL 3 、BL 4 、BL 5 、BL 6 、BL 7 The zinc oxide element with a working voltage of 680V / 1 mA passes through BL1, BL2, BL3, BL 4 The lightning potential for suppressing embedding can be controlled within 1500V, and the amplitude of the lightning voltage is checked by BL 5 ...

Embodiment 2

[0060] see Figure 9 , the protector circuit of the present invention is composed of zinc oxide element BL 1 、BL 2 、BL 3 、BL 4 、BL 5 、BL 6 、BL 7 constituted where the ZnO element BL 1 、BL 2 、BL 3 、BL 4 For T-T mode SPD, BL 4 、BL 5 、BL 6 、BL 7 For T-N mode SPD, the three phase line terminals of the output ports connected by T-T and T-N are respectively connected to one input terminal of single-phase isolation transformers B1, B2 and B3, and the other input terminals of isolation transformers B1, B2 and B3 are connected to the input terminal The zero lines are connected together, and the output terminals of the isolation transformers B1, B2, and B3 form three independent output ports. Generally, the zero lines of the output ports are connected together, and the zero line is connected together. If BL is selected 1 、BL 2 、BL 3 、BL 4 、BL 5 、BL 6 、BL 7 Zinc oxide components with a working voltage of 680V / 1MA go through BL1, BL2, BL3, BL 4 The lightning potential...

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Abstract

The invention relates to a grounding-free direct lightning protector for a three-phase power-supply system. A T-T mode surging protector, a T-N mode surging protector, a primary phase line and a null line are respectively serially connected to a phase line and a null line at output ends of the T-T mode surging protector and T-N mode surging protector, thereby forming the grounding-free direct lightning protector, wherein the T-T mode surging protector is composed of zinc oxide components BL1, BL2, BL3 and BL4; the T-N mode surging protector is composed of zinc oxide components BL4, BL5, BL6 and BL7; and a secondary of an isolation transformer is designed as an output port of a lightning protector. The grounding-free direct lightning protector has a lightning position and lightning voltage dual protection function. The isolation transformer is used for isolating the lightning position influence at input and output phase lines. A consumption channel is composed of a power grid null line or shell and a grounding zero potential point, thereby consuming the lightning effect on a system, lowering grounding cost of lightning protection engineering, tapping high impedance of a consuming way, reducing the lightning currents flowing through the zinc oxide components of T-T and T-N systems, and promoting protection reliability.

Description

technical field [0001] The invention relates to a lightning protection grounding wire free of connection, which is used in a three-phase power supply system and can reliably protect the power supply system from direct lightning strikes, and can be widely used in electronic and electrical equipment powered by a three-phase power supply system Protection from direct lightning strikes. Background technique [0002] Standard power system lightning protection measures such as figure 1 Shown: SPD is installed at the power supply inlet, and the SPD grounding port is connected to the ground with a good lightning protection grounding system (grounding downlead and grounding body) after the equipotential connection is carried out with the protected equipment through the grounding bus bar. [0003] Recognized protection mechanism: The lightning potential energy W introduced from the power grid system is released to the earth through the SPD and the lightning protection grounding wire....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04
Inventor 叶林
Owner HANGZHOU BILEI TECH