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Self-power digital overcurrent relay

An overcurrent relay and self-powered technology, which is applied in the direction of overcurrent protection, electrical components, circuit devices, etc., can solve problems such as no power supply, and achieve the effect of improving the load protection function

Inactive Publication Date: 2009-05-27
XIAN YUANZHENG INTELLIGENT SOFTWARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the shortcomings in the above-mentioned background technology, the present invention provides a self-powered digital overcurrent relay, which integrates power monitoring, relay protection, microcomputer control, and communication, and truly solves the problem of 5kv / 10kv switching. Power stations, ring network cabinets, etc. have no power supply and need protection functions, which greatly improves the safety of the distribution network

Method used

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Embodiment Construction

[0022] The present invention takes 16-bit single-chip microcomputer PIC24FJ128GA006 as the control core, adopts high-performance current transformers, and simultaneously monitors 4-way current signals (Ia, Ib, Ic, Io). Self-powered overcurrent relays are equipped with three analog measurement inputs (three-phase current). The self-powered overcurrent relay protection system provides 4 CTs with different ratios according to the rated system current. System operation is very easy to use. The user only needs a "YZ410-Soft" software, and can set parameters and read trip value and trip time through the comprehensive interface. Alternatively, it can be adjusted via its DIP switches. Equipped with a remote trip input that accepts 110VAC or 220VAC. The self-powered overcurrent relay uses LED lights to indicate the working status of the relay. The LED is under the transparent plastic cover above the device to increase the anti-interference ability of the system. The present inventi...

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Abstract

The invention relates to a self-powered digital over-current relay, which integrates electric quantity monitoring, relay protection, microcomputer control and communication into a whole, really solves the problems that 5kv / 10kv switching stations, power distribution stations, ring main units and the like have no power supply and need protection function, and greatly improves the safety of power distribution networks. The relay comprises a single chip microcomputer, wherein the input end of the single chip microcomputer is connected with a multichannel current analog signal, an AC sampling circuit, an automatic gain amplification circuit and a DIP dial switch respectively; the output end of the single chip microcomputer is connected with an output circuit; a serial port of the single chip microcomputer is connected with a communication interface; all hardware circuits of the single chip microcomputer are provided with a watchdog resetting and low-voltage monitoring circuit and a FALSH memory; the single chip microcomputer is PIC24FJ128GA006; the multichannel current analog signal is connected with the input end of the AC sampling circuit through the output end of a current transformer; and the output end of the AC sampling circuit is converted by the automatic gain amplification circuit and then is connected with an A / D acquisition interface inside the single chip microcomputer.

Description

1. Technical field: [0001] The invention relates to a relay, in particular to a self-powered digital overcurrent relay, which is suitable for 5kv / 10kv switching stations, power distribution stations, ring network cabinets and other occasions without power supply and requiring protection functions. 2. Background technology: [0002] In the background technology, when the power distribution network expands larger, more high-power transformers are required. At this time, the high-voltage fuse cannot be used. In this case, the self-powered digital overcurrent relay protection system becomes the most ideal choice, but there is no such equipment at home and abroad. 3. Contents of the invention: [0003] In order to solve the shortcomings in the above-mentioned background technology, the present invention provides a self-powered digital overcurrent relay, which integrates power monitoring, relay protection, microcomputer control, and communication, and truly solves the problem of...

Claims

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Application Information

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IPC IPC(8): H02H3/08H02J13/00
Inventor 石文生张建虎王正虎淮春霞
Owner XIAN YUANZHENG INTELLIGENT SOFTWARE
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