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Method and device for detecting lack of null line in three-phase power supply

A three-phase power supply and line detection technology, which is applied in the field of air conditioning, can solve the problems such as the inability to detect the lack of neutral line, and achieve the effect of ensuring electricity safety and improving economy

Active Publication Date: 2015-11-18
GD MIDEA HEATING & VENTILATING EQUIP CO LTD +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, in the related art, either only the phase sequence of the three-phase power supply is detected but whether the neutral line is missing, or an additional hardware circuit is required to detect whether the three-phase power supply is missing the neutral line

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  • Method and device for detecting lack of null line in three-phase power supply
  • Method and device for detecting lack of null line in three-phase power supply
  • Method and device for detecting lack of null line in three-phase power supply

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Embodiment Construction

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0020] A method for detecting a missing neutral line of a three-phase power supply and a device for detecting a missing neutral line of a three-phase power supply according to embodiments of the present invention will be described below with reference to the accompanying drawings.

[0021] Such as figure 2 As shown, the three-phase power supply missing neutral line detection method proposed by the embodiment of the present invention includes the following steps:

[0022] S1, to obtain the time difference between phase A power, ...

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Abstract

The invention discloses a method for detecting lack of a null line in a three-phase power supply, and includes the steps of: obtaining time differences among A phase current, B phase current and C phase current of the three-phase power supply, and recording as Tab, Tbc and Tca; when a phase sequence of the three-phase power supply is judged to be normal according to Tab, Tbc and Tca, controlling a load corresponding to any one of the A phase current, B phase current and C phase current to be turned on, obtaining time differences among the A phase current, B phase current and C phase current again, and recording as Tab', Tbc' and Tca'; and judging whether the three-phase power supply lacks a null line according to Tab, Tbc, Tca and Tab', Tbc' and Tca'. The method for detecting lack of the null line in the three-phase power supply can detect whether the three-phase power supply lacks the null line without additionally adding a related hardware circuit, thereby ensuring power utilization safety without increasing cost. The invention also discloses a device for detecting lack of the null line in the three-phase power supply.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a method for detecting a missing neutral wire of a three-phase power supply and a device for detecting a missing neutral wire of a three-phase power supply. Background technique [0002] At present, my country's low-voltage power grid adopts a three-phase four-wire system for power supply. The rated voltage of low-voltage electrical equipment is generally 380V, and the phase voltage is 220V. However, under the superimposed effect of various negative reasons, the low-voltage voltage imbalance can exceed ±10%, especially when the line load is unbalanced. If the neutral line is disconnected, it will cause damage to the residents on the low-voltage power supply system. Harm. [0003] For example, for air conditioners, the three-phase load is often unbalanced, which requires timely processing when the air conditioner lacks a neutral line to ensure electricity safety. Howeve...

Claims

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Application Information

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IPC IPC(8): G01R29/16
Inventor 王豪浩周峰
Owner GD MIDEA HEATING & VENTILATING EQUIP CO LTD
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