Device for evaluating small current variable by apparent power

A small current and variable technology, applied in the direction of apparent power measurement, electrical devices, measuring devices, etc., to avoid waste of raw materials, ensure safe production, and reduce losses

Pending Publication Date: 2020-04-10
山东计保电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] It can be seen that technologies such as leakage protectors and small current grounding can no longer meet the needs of the development of power grids. It ...

Method used

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  • Device for evaluating small current variable by apparent power
  • Device for evaluating small current variable by apparent power
  • Device for evaluating small current variable by apparent power

Examples

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Embodiment Construction

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] The gist of the present invention is to use a current detection device to detect the current on the ground wire of the equipment, the zero-sequence current line or the ground lead of the insulation part, and multiply the detected current by a given apparent voltage to form an apparent power , the apparent power is accumulated to obtain the apparent power, and then the apparent power is read every interval of the same length of time to see the amount of change in the apparent power in the same period, if the change in the apparent power in each time period The range of change is not large, and it is basically in a stable state, which means that the destructive energy on the line has not changed significantly. Continue to maintain the above time interval to read the apparent power and check the change of the apparent power; if the...

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Abstract

The invention discloses a device for evaluating a small current variable by apparent power, and belongs to the technical field of electromagnetic measurement. The device comprises a current sensor, and is characterized in that the current sensor is used for detecting the current on a line; a current sampling circuit in an apparent power sensor collects the detected current; an arithmetic unit multiplies the collected current by a given apparent voltage to obtain apparent power, and accumulates the apparent power in real time to obtain apparent electric quantity; and a central processing unit reads the apparent electric quantity according to a set time interval, calculates the variation of the apparent electric quantity in each time period, compares the relative variation amplitude of the apparent electric quantity variations in two adjacent time periods, and makes a decision of continuing to detect or report the information. The judgment device judges the change trend of damage energyin the line according to the change amplitude of the apparent electric quantity in the adjacent same-length time periods, and can upload a signal when the increase amplitude of the apparent electric quantity is relatively large so as to remind a worker to take security check measures.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic measurement, and in particular relates to a device for judging small current variables by using apparent power. Background technique [0002] Since the end of the 1960s, in order to strengthen the safety of electricity use, my country has gradually adopted protection measures in the power system, among which the leakage protector is a general technical means. The leakage protector detects the abnormal current or voltage signal of the monitoring equipment or the circuit. When the detected signal reaches its set threshold, it prompts the actuator to act to cut off the power supply, so as to avoid accidents such as burning out electrical appliances, fire or electric shock, so as to ensure personal safety and health. To ensure the safety of electrical equipment and achieve the purpose of protection. [0003] Later, some also adopted the method of small current grounding, which installed a zer...

Claims

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Application Information

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IPC IPC(8): G01R21/00G01R21/06G01R22/06G01R19/00G01R31/52G01R31/12G01R31/08
CPCG01R19/0092G01R21/005G01R21/06G01R22/06G01R31/085G01R31/1272
Inventor 荣博荣潇杨剑郭亮张海静宋增祥宋淄琳
Owner 山东计保电气有限公司
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