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Digital AC grid insulation monitoring instrument

An insulation monitor and AC power grid technology, applied in the direction of testing dielectric strength, fault location, etc., can solve the problems of low reliability, low insulation monitoring accuracy, heavy workload, etc., and achieve high accuracy, high bus utilization, high The effect of anti-electromagnetic interference

Pending Publication Date: 2017-12-15
山东航海电器设备有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of low precision, heavy workload and low reliability of the existing ship AC grid insulation monitoring, the purpose of the present invention is to provide a digital AC grid insulation monitor with high monitoring accuracy and good reliability

Method used

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  • Digital AC grid insulation monitoring instrument
  • Digital AC grid insulation monitoring instrument
  • Digital AC grid insulation monitoring instrument

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Experimental program
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Embodiment Construction

[0018] exist figure 1 Among them, a digital AC grid insulation monitor includes N current transformers 1, N low-pass filters 2, AD converters 3, switching value information input module 4, switching value information output module 5, a first optical Coupler 6, second optical coupler 7, information monitoring host 10 and PC computer 11. Wherein, N is a positive integer greater than or equal to 2. The number of low-pass filters 2 is in one-to-one correspondence with the number of current transformers 1 .

[0019] Such as figure 1 As shown, N current transformers 1 are installed on each short-circuiter of the load screen, and N current transformers 1 transmit the detected high and low values ​​of each branch grid insulation to the AD converter through the corresponding low-pass filter 2 3. After being converted by the AD converter 3, communicate with the information monitoring host computer 10 or the PC computer 11 through the CAN bus 8 and the Ethernet interface 9. The curre...

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Abstract

The invention discloses a digital AC power grid insulation monitor, which solves the problems of low accuracy and reliability of the existing ship AC power grid insulation monitoring. It includes N current transformers, N low-pass filters, AD converter, switch information input module, switch information output module, first optocoupler, second optocoupler, information monitoring host and PC computer; N current transformers are installed on each short-circuiter of the load screen, and the detected high and low values ​​of the grid insulation of each branch are transmitted to the AD converter through the corresponding low-pass filter, and then communicated with the CAN bus and Ethernet interface. Information monitoring host computer or PC computer communication. Its current transformer detects the fault current, and performs relevant calculation processing and logical judgment on the fault current, and transmits the judgment result to the on-duty personnel through the information monitoring host or PC computer, so as to know the fault point of the grid insulation in time. The invention has high insulation monitoring precision and improves the power supply reliability of the grid.

Description

technical field [0001] The invention belongs to the technical field of fault detection equipment, in particular to a digital AC power grid insulation monitor. Background technique [0002] Modern ship power systems usually use three-phase three-wire insulation systems. Due to the harsh operating environment and long-term exposure to the outside, affected by environmental factors such as sunlight, wind waves, oil pollution, sea water and mold, the insulation performance of the ship's power grid is reduced, and the power grid insulation failure sometimes occurs. Occurs, ranging from damage to electrical equipment, to causing short-circuit fires in the ship's power system, and even major accidents such as ship sinking or casualties. Therefore, how to effectively find the insulation fault of the ship power grid has become one of the research contents of ship power technicians. [0003] When the insulation reduction fault occurs in the AC power grid of the ship, it is urgent to ...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/12
CPCG01R31/08G01R31/12
Inventor 苑芳宋大卫
Owner 山东航海电器设备有限公司
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