Shared-frequency asynchronous phase-checking method

A technology of synchronous frequency, asynchronous and nuclear phase, which is applied in the direction of phase sequence/synchronous indication, phase angle between voltage and current, measuring device, etc. Range limitations and other issues, to achieve the effect of convenient power supply, phase offset elimination, and convenient storage

Active Publication Date: 2011-01-12
上海希明电气技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] 3. There are many personnel involved in a "nuclear phase" test, and the labor cost is very high;
[0015] 4. There are many steps in the whole test work, which takes a long time and affects the effective power supply time of the whole power supply system;
[0016] 5. The nuclear phase operation has certain risks, especially the wired phase nuclear method, and the cooperation and coordination of personnel must be considered;
[0017] 6. The distance between the two power points should not be too far. According to the actual operation exper...

Method used

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  • Shared-frequency asynchronous phase-checking method

Examples

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Effect test

Embodiment 1

[0164] Phase verification steps between the conventional system power supply and the power supply under test:

[0165] 1) Self-inspection and self-nucleation steps:

[0166] Since the intelligent phase-nucleation pen adopts the asynchronous phase-nucleation method, the self-inspection work and process are relatively simple.

[0167] Insert the synchronous reference signal generator into the mains socket, and the smart phase-nuclear pen will be turned on. After receiving the synchronous reference signal, the smart phase-nuclear pen will give a voice prompt and report a "normal" message, and the self-test of the device will be completed.

[0168] Then, conduct a self-nucleation test on the 380V three-phase power circuit or the PT secondary three-phase voltage circuit in the substation. Taking the A phase as the reference, the three phases A, B, and C are respectively tested, and the "in-phase", "lag ", "advanced", it can be determined that the smart nuclear phase pen device is ...

Embodiment 2

[0181] Checking steps for normal phase sequence of single power supply:

[0182] Since the method can determine the phase difference between the phases of the AC power supply, it can also measure and check the phase sequence / phase among the three phases of a single AC power supply.

[0183] The operator comes to the phase-nucleation site, places the smart phase-nucleation pen on the insulating rod (electric test pen or link rod), turns on the power of the smart phase-nucleation pen, and after receiving the synchronization reference signal, the smart phase-nucleation pen voice prompts, reporting " "Normal" message, prompting the operator to start the phase sequence check.

[0184] Step 1: Use phase A of the power supply as a reference, and check the phase of phase B of the power supply:

[0185] The operator holds the insulating rod to make the intelligent phase-nuclear pen contact with the test point of phase A of the power supply. After a pause of 2 to 3 seconds, the phase s...

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Abstract

The invention discloses a shared-frequency asynchronous phase-checking method and belongs to the field of measurement. The method comprises the following steps of: generating a synchronous standard phase signal serving as a third-party reference by means of a commercial power network; sequentially acquiring a voltage phase signal between each phase of a system power supply and each corresponding phase of the to-be-checked power supply; performing phase comparison on the measured voltage phase signal and the third-party reference at the time to obtain a voltage phase differential value; comparing the voltage phase differential value between each phase of the system power supply and each corresponding phase of the to-be-checked power supply to obtain a comparison phase difference; and judging whether each phase of the system power supply and each corresponding phase of the to-be-phased power supply belong to the same phase or not according to the value range of the phase difference so as to obtain the conclusion whether the system power supply has the same phase as the to-be-phased power supply or not. The asynchronous phase-checking method can check phases of systems with the same or different voltage levels, can test whether a power supply loop has the failures, such as 'phase failure' and the like, or not, can check phases in different places and widens the application field of the routine phase-checking tests.

Description

technical field [0001] The invention belongs to the field of measurement of electromagnetic variables, in particular to a measurement method for measuring the phase angle between the voltages of two AC power sources. Background technique [0002] Phase sequence, that is, the sequence of phases, is the sequence in which the instantaneous value of alternating current changes from negative to positive and passes through zero. [0003] The "Phase Check" test is a test test to check the phase / phase sequence of the three-phase power supply between two power sources, and is one of the basic experiments of the power system. [0004] If the AC power supplies with different phases or phase sequences are "parallel" or "closed", a large current will be generated, and the huge current (commonly known as "circulating current") will cause damage to electrical equipment. [0005] Therefore, for newly built, rebuilt, and expanded substations and transmission lines, and before the line is ov...

Claims

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Application Information

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IPC IPC(8): G01R29/18G01R25/00
Inventor 孙阳盛沈光敏王立峰殷立军都文蔚聂鹏晨谢邦鹏张华于盛楠张瑾万轶伦
Owner 上海希明电气技术有限公司
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