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Composite-ratio current transformer with on-line intelligent switching function

A transformer and specific current technology, which is applied in the direction of voltage/current isolation, etc., can solve the problem that the complex ratio current transformer cannot be automatically converted online, so as to solve the problem of not being able to automatically switch online, avoid equipment damage and personal injury accidents, and prevent secondary accidents. The effect of secondary opening

Active Publication Date: 2018-01-30
STATE GRID CORP OF CHINA +3
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  • Application Information

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Problems solved by technology

[0004] The invention solves the problem that the existing complex ratio current transformer cannot be automatically converted online, and provides a complex ratio current transformer with online intelligent conversion

Method used

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  • Composite-ratio current transformer with on-line intelligent switching function

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Embodiment Construction

[0009] The complex ratio current transformer with online intelligent conversion, including complex ratio current transformer body CT, sampling current transformer CT1, RMS processing circuit module, A / D conversion module, MCU microprocessor with communication interface, protection relay JB, Control relay JK, common power-off delay relay J2 for large and small transformation ratios, and power-off delay relay J1 for large transformation ratio; any secondary winding of the complex ratio current transformer body CT is selected as the secondary winding for metering, and the secondary winding for metering has Common tap end 1S1, small ratio tap end 1S2 and large ratio tap end 1S3; common tap end 1S1 is coupled with the primary winding of sampling current transformer CT1 and used as the polarity end of the metering secondary winding; small ratio tap end 1S2 It is connected to one end of the normally open contact J2-1 of the power-off delay relay J2 shared by the scale ratio, and the o...

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Abstract

The invention relates to a composite transformation ratio current transformer in an electric energy metering device, i.e., a composite-ratio current transformer, specifically to a composite-ratio current transformer with an on-line intelligent switching function, and solves the problem that an existing composite-ratio current transformer cannot realize on-line automatic switching. The composite-ratio current transformer with the on-line intelligent switching function includes a composite-ratio current transformer body CT, a sampling current transformer CT1, an RMS processing circuit module, anA / D conversion module, an MCU microprocessor with an input port, a control relay JK, a protective relay JB, a large and small transformation ratio sharing power-off time delay relay J2 and a large-transformation ratio power-off time delay relay J1. The composite-ratio current transformation provided by the invention can realize on-line automatic switching of the transformation ratio, and has protective measures of preventing a secondary open circuit; and the structural design is reasonable and unique, the problem that an existing composite-ratio current transformer cannot realize on-line automatic switching is solved, equipment damage and personal injury accidents can be effectively avoided. The Composite-ratio current transformer is suitable for an electric energy metering device.

Description

technical field [0001] The invention relates to a complex ratio current transformer in an electric energy metering device—a complex ratio current transformer, in particular to a complex ratio current transformer with online intelligent conversion. Background technique [0002] At present, the electric energy metering device circuit only designs a current transformer with a single variable ratio or double variable ratio for the rated load power consumption. Only one variable ratio current transformer is installed on site at one time. It is strictly forbidden to change the variable ratio after power-on. Because the secondary open circuit is very dangerous to the power grid. It is very dangerous to change the transformation ratio of the current transformer by manually shorting the jumper twice, which is not allowed by safety regulations. The current transformers for electric energy measurement are all S-class, and generally designed to operate within the range of 20% to 120% o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/18
Inventor 程昱舒韩霞马斌韩海洲苗旺梁新帅酒小朋马娟段新华曹雁娜贾斌郭心远
Owner STATE GRID CORP OF CHINA
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