Low current earth routing system based on CAN

A line selection and zero-sequence current technology, which is applied in the field of small current grounding line selection system, achieves the effects of fashionable appearance, enhanced competitiveness, and friendly man-machine interface

Active Publication Date: 2013-03-20
NANJING INTELLIGENT APP
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Problems solved by technology

[0005] The present invention provides a small current grounding line selection system to ov

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  • Low current earth routing system based on CAN
  • Low current earth routing system based on CAN
  • Low current earth routing system based on CAN

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Embodiment Construction

[0028] The technical solutions of the present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0029] Microcomputer comprehensive protection device PA62 is mainly composed of main board (including DSP, ferroelectric memory, sampling circuit, protection opening and closing relay, holding relay, etc.), power board (including power module, current-voltage converter module, operational amplifier module, etc.), Composed of components such as display module and infrared remote control.

[0030] Such as Figure 1 to Figure 5 Shown is the general structural block diagram and the structural block diagram of each component of the microcomputer integrated protection device PA62 in the present invention.

[0031] The voltage and current signals converted by the primary equipment voltage and current transformer of the power grid are transformed into weak current signals by the internal voltage and current transformer o...

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Abstract

The invention discloses a low current earth routing system based on a CAN (controller area network) and a processing method of the system. The system mainly comprises a plurality of integrated microcomputer protection measurement and control devices capable of calculating and analyzing zero-sequence protection steady state components, wherein the integrated microcomputer protection measurement and control devices are connected by the CAN and share the respective zero-sequence protection steady state components obtained by calculation; when a line has an earth fault, all the protection devices detecting error states share respective zero-sequence component data simultaneously through the CAN; the most likely earth fault spot is found out by a routing principle; and the fault earth is lift by tripping so that the fault is removed securely. According to the low current earth routing system, the protection devices are used for analytical judgment of the steady state data when the earth fault happens, and large-area unwanted operation or refuse operation caused by limitation of a site environment and a single protection device routing condition is avoided effectively.

Description

technical field [0001] The invention relates to a small current grounding line selection system, which belongs to the field of relay protection. Background technique [0002] my country's power distribution network and large-scale industrial and mining enterprises mostly adopt the operation mode of ungrounded neutral point or grounded through arc suppression coil. In recent years, some urban power grids have switched to resistance grounded operation mode. In the past, the 6~10kv power grid in the mine has always adopted the neutral point ungrounded method. With the lengthening of the underground power supply line, the capacitive current increases. In recent years, the arc suppression coil has been popularized and applied in the mine power grid, and the grounding method of the arc suppression coil and series resistance is mainly used. [0003] In actual operation, single-phase ground faults account for about 80% of the total faults; therefore, when a single-phase ground fa...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 张杭陈军
Owner NANJING INTELLIGENT APP
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