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Method for determining failure of alternating-current power detecting unit

A technology of alternating current detection and alternating current, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve problems such as Hall sensor damage is not easy to be found, detection results are wrong, and correct judgments are affected, and the judgment method is simple and effective, and the occupancy is reduced , the effect of saving network bandwidth

Active Publication Date: 2017-12-12
KEHUA DATA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the detection unit itself is damaged but not detected in time during the detection process, it may cause errors in the detection results and affect the correct judgment
Hall sensors are widely used in electrical quantity detection due to their simple structure, small size, and linear output, but the damage of Hall sensors is not easy to be found

Method used

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  • Method for determining failure of alternating-current power detecting unit
  • Method for determining failure of alternating-current power detecting unit
  • Method for determining failure of alternating-current power detecting unit

Examples

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Embodiment 1

[0033] The invention provides a method for judging the failure of an alternating current detection unit, such as figure 1 As shown, follow the steps below to achieve:

[0034] Step S1: Timing Ts samples the voltage value or current value output by an AC detection unit; after comparing each sampled value with a reference value, converts the sampled value into a binary bit code 1 or 0, and converts the binary bit code Store in a storage unit bit by bit; A sampling values ​​are sampled in a judging period, and the judging period A*Ts is not less than the period T of the alternating current;

[0035] Step S2: read and count the number of binary bit codes 1 and 0 in the storage unit bit by bit, and record them as B and C respectively;

[0036] Step S3: Compare B and C with a threshold, or compare |B-C| with the threshold; when at least any one of B or C is less than the threshold or |B-C| is greater than the threshold, it is judged as an AC detection unit Invalid; where |B-C| is ...

Embodiment 2

[0050] The invention provides a method for judging the failure of an alternating current detection unit, such as figure 2 As shown, follow the steps below to achieve:

[0051] Step S1: Timing Ts samples the voltage value or current value output by an AC detection unit; after comparing each sampled value with a reference value, converts the sampled value into a binary bit code 1 or 0, and converts the binary bit code Store in a storage unit bit by bit; A sampling values ​​are sampled in a judging period, and the judging period A*Ts is not less than the period T of the alternating current;

[0052] Step S2: read and count the number of binary bit codes 1 and 0 in the storage unit bit by bit, and record them as B and C respectively;

[0053] Step S3: Compare B and C with a threshold, or compare |B-C| with the threshold; when at least any one of B or C is less than the threshold or |B-C| is greater than the threshold, it is judged as an AC detection unit Invalid; where |B-C| is...

Embodiment 3

[0070] In the single-phase detection of Hall failure in UPS, the traditional method of detecting the failure of the Hall AC current sensor by judging that the effective value of the sum of the three-phase inverter current exceeds a certain threshold is often limited to the three-phase three-wire system. Phase four wire or single phase systems are not valid. The traditional method can only judge the failure of the Hall AC current sensor, but cannot specifically locate which phase of the Hall AC current sensor fails.

[0071] Furthermore, the inverter current under normal UPS operation can exhibit AC characteristics regardless of no-load or full-load, and the inverter current sampled under the Hall failure situation exhibits more DC characteristics. Based on the above feature extraction, in this embodiment, the first reference value and the second reference value are determined to be 3A and -3A respectively, and the sampling current is divided into positive area (>3A), negative ...

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Abstract

The invention relates to a method for determining the failure of an alternating-current power detecting unit. The method comprises: step one, a voltage value or a current value outputted by an alternating-current power detecting unit is sampled regularly at fixed time interval Ts; after comparison of each sample value with a reference value, the sampled value is transformed into a binary bit code 1 or 0, and the binary bit code is stored into a storage unit by bits, wherein the A sampled values are sampled totally within a determination cycle and the determination cycle A*Ts is not less than a cycle T of the alternating-current power; step two, bit-based reading and statistics are carried out on the numbers of binary bit codes 1 and 0 in the storage unit and the number are marked as B and C; and step three, the B and the C are compared with a threshold or |B-C| is compared with the threshold; and when at least one of the B and C is smaller than the threshold or the |B-C| is larger than the threshold, the failure of the alternating-current power detecting unit is determined, wherein the |B-C| is an absolute value of the difference between the B and C. With the method provided by the invention, determination on the failure of an alternating-current power detecting unit is realized.

Description

technical field [0001] The invention relates to the field of electric quantity detection, in particular to a method for judging the failure of an alternating current detection unit. Background technique [0002] The voltage or current output by the AC power presents alternating positive and negative AC characteristics. The voltage or current parameters detected by the detection unit also have the same AC characteristics. If the detection unit fails, it usually shows a DC characteristic, that is, the output voltage value of the detection unit or The current value will maintain a positive or negative value or 0 output, that is, the AC characteristic of alternating positive and negative is lost. Under normal working conditions, the uninterruptible power supply or inverter outputs AC power. Production inspection must be carried out before the product leaves the factory to check whether the uninterruptible power supply or inverter is qualified. One of the important parameters is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00
Inventor 卢雄伟苏宁焕
Owner KEHUA DATA CO LTD
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