CN201601466U

CN201601466U - Feeder line protecting device

Info

Publication number: CN201601466U
Application number: CN2009202827973U
Authority: CN
Inventors: 李从飞
Original assignee: NANJING HONGYI ELECTRIC AUTOMATION CO Ltd
Current assignee: NANJING HONGYI ELECTRIC AUTOMATION CO Ltd
Priority date: 2009-12-31
Filing date: 2009-12-31
Publication date: 2010-10-06
Anticipated expiration: 2019-12-31

Abstract

The utility model relates to a feeder line protecting device, which has an arc light detecting function and starts arc light protection after detecting arc light and current mutational volume when a position from a feeder line to a cable joint is in fault. The technical scheme includes that the feeder line protecting device comprises an arc light probe, a photoelectric conversion module, a comparator, a FPGA, a current unit, a relay and a CPU, an arc light signal detected by the arc light probe enters the photoelectric conversion module via optical fibers, after photoelectric conversion, the arc light signal is compared with threshold level in the comparator to obtain digital level, the digital level is inputted into the FPGA, the FPGA performs filter and time compensation to the digital level and sends the digital level to the CPU to be processed, and the CPU detects the digital level inputted by the FPGA and each phase of current signal inputted by the current unit, and drives the relay to act when arc light and abrupt change of any phase of current are detected.

Description

A kind of feeder protection equipment

Technical field

The utility model relates to and belongs to field of relay protection in power, particularly a kind of feeder protection equipment.

Background technology

The positions such as cable connector of feeder switch cabinet bottom are the weak links of insulation, and herein as single-phase puncture over the ground takes place, because short circuit current is too little, traditional overcurrent protection generally is difficult for startup.And single-phase the puncture over the ground is easy to develop into two-phase or three relative ground circuits, though overcurrent protection this moment can be moved, fault has caused more serious damage to equipment.

At present both at home and abroad a lot of but does not possess the functions that arc light detects at the Microcomputer Protection of feeder line, but mainly be at middle voltage bus bar at the protection of arc fault specially, there are not needed other protections of feeder line.

Summary of the invention

The purpose of this utility model is to overcome existing feeder protection equipment and does not possess the defective that detects arc light; a kind of feeder protection equipment has been proposed; this device has the arc light measuring ability, behind the arc light and jump-value of current that produces when detecting feeder line to cable joint place fault, starts arc protection.

The technical solution of the utility model is: a kind of feeder protection equipment, comprise arc probe, photoelectric conversion module, comparator, FPGA, current unit, relay and CPU, the arc optical signal that arc probe detects enters photoelectric conversion module through optical fiber, obtain digital level through in comparator, comparing after the opto-electronic conversion with threshold level, digital level input FPGA, FPGA carries out filtering and time bias to this digital level, and is sent to CPU and handles; CPU detects the digital level of FPGA input and each phase current signal of current unit input, having detected that arc light produces and any phase current when sudden change is arranged, drives the actuating of relay.

In the utility model; photoelectric conversion module and comparator constitute arc light and detect plug-in unit; arc light detects plug-in unit and is located at and has the syllogic overcurrent protection, on the feeder line microcomputer protecting device of syllogic zero-sequence current protection, under-voltage protection, overload protection, secondary reclosing and distributing earthing wire-selecting function, make feeder protection equipment have the arc light measuring ability.

As further improvement of the utility model, feeder protection equipment adopts DSP as the CPU that carries out core calculations and logic determines, and DSP also is connected with display, keyboard respectively, and DSP also is connected to Ethernet.

Advantage of the present utility model is:

1, principle is simple, and arc light adds jump-value of current and starts feeder line arc protection function;

2, outlet is rapid, and arc light and jump-value of current do not need long calculation window, and whether CPU can need outlet with interior judging at 1ms, and producing the relay outlet from arc light can be controlled in the 8ms.

Description of drawings

Fig. 1 is the feeder protection equipment structured flowchart of the utility model embodiment 1.

Embodiment

Provide specific implementation method of the present utility model below in conjunction with accompanying drawing.

Embodiment 1

As shown in Figure 1; a kind of feeder protection equipment comprises arc probe, photoelectric conversion module, comparator, FPGA, electric current and voltage detecting unit, opens into optocoupler, leaves relay, communication interface (GPS, Ethernet), man-machine interface (display, keyboard) and CPU.Wherein FPGA links to each other by bus with CPU, open into, leave with CPU and link to each other by the IO interface, the electric current and voltage detecting unit links to each other with the inner AD converter of CPU.

The arc optical signal that arc probe detects enters photoelectric conversion module through optical fiber, obtain digital level through in comparator, comparing after the opto-electronic conversion with threshold level, digital level input FPGA, FPGA carries out filtering and time bias to this digital level, and is sent to CPU and handles.

Digital feeder protection equipment adopts DSP as core calculations and logic determines CPU; open into amount by the light-coupled isolation collection; gather of ac by electromagnetic isolation and AD converter; gather arc light information by arc probe; by keyboard input definite value and parameter; by relay output action information, provide report, customized information by liquid crystal, link to each other with the backstage by Ethernet.

Feeder protection equipment of the present utility model has arc protection, syllogic current protection, syllogic zero-sequenceprotection, piezoelectric voltage protection, overload protection, secondary reclosing and distributing earthing wire-selecting function.

Claims

1. feeder protection equipment, it is characterized in that, this device comprises arc probe, photoelectric conversion module, comparator, FPGA, current unit, relay and CPU, the arc optical signal that arc probe detects enters photoelectric conversion module through optical fiber, obtain digital level through in comparator, comparing after the opto-electronic conversion with threshold level, digital level input FPGA, FPGA carries out filtering and time bias to this digital level, and is sent to CPU and handles; CPU detects the digital level of FPGA input and each phase current signal of current unit input, having detected that arc light produces and any phase current when sudden change is arranged, drives the actuating of relay.

2. according to right 1 desired feeder protection equipment, it is characterized in that described photoelectric conversion module and comparator constitute arc light and detect plug-in unit.

3. according to right 1 desired feeder protection equipment, it is characterized in that described CPU adopts DSP.

4. according to right 1 or 3 desired feeder protection equipments, it is characterized in that described CPU also is connected with display, keyboard, Ethernet respectively.