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Default phase detection device for three-phase sinusoidal alternating current

A sinusoidal alternating current and three-phase alternating current technology, applied in the electrical field, can solve the problems of high cost, large number of voltage sensors, phase failure and other problems, and achieve the effect of high cost performance.

Inactive Publication Date: 2013-03-13
CRRC DALIAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be concluded that if U1~U3 are not equal and the deviation is too large, a phase loss fault occurs
However, this detection scheme uses a large number of voltage sensors, takes up a lot of resources, and costs high

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  • Default phase detection device for three-phase sinusoidal alternating current
  • Default phase detection device for three-phase sinusoidal alternating current
  • Default phase detection device for three-phase sinusoidal alternating current

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Embodiment Construction

[0009] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0010] see figure 2 , In the three-phase sinusoidal alternating current phase loss fault detection device of this embodiment, the transformation ratios of the voltage sensors T1 and T2 are both 1:1. The U, V, and W phases of the three-phase AC are respectively connected with detection resistors R1~R6 with the same resistance, among which: R...

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Abstract

The invention relates to a default phase detection device for a three-phase sinusoidal alternating current. Phases U, V and W of the three-phase alternating current are respectively connected with detection resistors R1-R6 with the same resistance value, wherein R1 and R5 are connected with the phase U, R2 and R4 are connected with the phase V, and R3 and R6 are connected with the phase W; the other ends of the detection resistors are connected with two voltage sensors with the same no-load voltage ratio; and R1 is connected to one end of a primary side of a voltage sensor T1, R2 and R3 are connected together to the other end of the primary side of the T1, R4 is connected to one end of a primary side of a voltage sensor T2, and R5 and R6 are connected together to the other end of the primary side of the T2. Fewer apparatuses are used, and the cost performance is very high.

Description

technical field [0001] The invention belongs to the field of electrical technology, and in particular relates to a three-phase sinusoidal alternating current phase loss fault detection device. Background technique [0002] The lack of phase fault detection technology of three-phase AC is of great significance to the three-phase AC system. When a phase loss fault is detected, the relevant protection circuit can act to protect the entire power system or prevent the fault from expanding. A classic open-phase fault detection circuit such as figure 1 As shown, its working principle is as follows: the phase loss detection circuit detects the line voltage of the three-phase AC through three voltage sensors T1~T3, the output voltages of T1~T3 are U1~U3 respectively, and the system judges by comparing the values ​​of U1~U3 Whether there is a phase loss fault. For example, assuming that the phase voltage of the three-phase alternating current is U, if a phase failure occurs on phas...

Claims

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Application Information

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IPC IPC(8): G01R31/02
Inventor 梁刚冷旭东赵永玲魏春光付学光肖桦
Owner CRRC DALIAN CO LTD