CN201336552Y

CN201336552Y - Coal-mining earth-leakage protection device with high-voltage selectivity

Info

Publication number: CN201336552Y
Application number: CNU2009200880152U
Authority: CN
Inventors: 周金明; 马星河; 毕国庆
Original assignee: JIYUAN CITY KELING ELECTRIC APPLIANCE CO Ltd
Current assignee: JIYUAN CITY KELING ELECTRIC APPLIANCE CO Ltd
Priority date: 2009-01-05
Filing date: 2009-01-05
Publication date: 2009-10-28
Anticipated expiration: 2019-01-05

Abstract

The utility model relates to a coal-mining earth-leakage protection device with high-voltage selectivity, which can fast search a high-voltage single-phase grounding feed-out wire through a single-phase grounding protective device on a high-voltage feed wire of a ground transformer substation. A main control unit circuit comprises a microcontroller chip and a programmable logic chip; an ROM and an RAM, as well as a watch dog circuit and a power-off retaining circuit, are expanded on the microcontroller chip; a human-computer interface circuit is arranged on the interface of the programmable logic chip; the human-computer interface circuit comprises a keyboard inputting circuit and a liquid crystal displaying circuit; an RS 485 serial communication circuit is arranged on the interface of the programmable logic chip; an analog-to-digital converter AD is connected with the inputting and outputting ports of the microcontroller chip; the input terminal of the analog-to-digital converter AD is connected with the programmable logic chip; and the analog signal terminal is connected with the input terminal of the analog-to-digital AD through a filter circuit and a multi-channel switch. The coal-mining earth-leakage protection device effectively solves the problem that the prior earth-leakage protection device with high-voltage selectivity has the low accuracy in selecting lines.

Description

Colliery High Voltage Selective earth leakage protective device

Technical field

When the utility model relates to a kind of coal mine ground high-voltage fence generation single phase ground fault; the one-phase ground protection device of installing on the high-tension main by ground electric substation realizes searching fast the colliery High Voltage Selective earth leakage protective device that the high pressure single phase ground fault feeds out circuit.

Background technology

Colliery High Voltage Selective earth leakage protective device; be meant in every in coal mine ground electric substation (being generally 6kV or 10kV electric pressure) to feed out on the circuit installing zero-sequence transformer and this signal is passed in the digital earth leakage protective device which bar circuit handles the back device can demonstrate single phase ground fault at the utmost point in the short time the circuit that feeds out by microcomputer according to related algorithm specifically is.From early 1960s China's trial-production colliery high-pressure leakage protection device that just begins one's study, developed multiple optionally high pressure leak detection protection and the monitoring and protection devices type that is applicable to ground and down-hole for many years.Now Yan Jiu earth leakage protective algorithm is mainly based on steady-state component and transient state component route selection.1. the steady-state component discretionary wiring type earth leakage protective of current development is broadly divided into zero-sequence current type, zero sequence power direction type and harmonic direction type three classes by operation principle.2. the discretionary wiring type earth leakage protective device that is applied to the mine high-voltage fence at present is mainly based on the steady-state component route selection, and the transient state component route selection is less.Mainly contain the transient zero-sequence current comparison method in the research, first half-wave method etc.Adopt single steady-state component route selection or the route selection of transient state route selection component to have following a lot of unavoidable problem: 1. adopt single line selection algorithm (a large amount of transient state electric characteristics that occur when adopting the steady-state component line selection algorithm then with single-phase earthing abandon need not, make the route selection accuracy rate reduce.If adopt the transient state component line selection algorithm then the fault stable state electric fault feature that the easiest sampling obtains is cast aside, influence the route selection accuracy rate equally.) 2. existing algorithm do not make full use of the fault message amount of all feeder lines, make the route selection accuracy rate reduce.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art and provides a kind of steady-state component route selection and transient state component route selection are taken all factors into consideration, and effectively solves the colliery High Voltage Selective earth leakage protective device of the low problem of original High Voltage Selective earth leakage protective device route selection accuracy rate.

The purpose of this utility model is achieved in that and comprises that the processing of finishing data, protection logic determines, switching value input control the main control unit circuit of communicating by letter with upper PC recorder data with output and liquid crystal display, it is characterized in that:

The main control unit circuit comprises INTEL80296SA microcontroller chip and EPM7128STC programmable logic chip, and expansion has ROM and RAM, watchdog circuit and power-down retaining circuit on the INTEL80296SA microcontroller chip; The interface of EPM7128STC programmable logic chip is provided with the man-machine interface circuit, and the man-machine interface circuit comprises keyboard input circuit and liquid crystal display circuit, also is provided with the RS485 serial communication circuit on the interface of EPM7128STC programmable logic chip;

Be connected with analog to digital converter AD on the I/O mouth on the INTEL80296SA microcontroller chip, the input of analog to digital converter AD is connected with the EPM7128STC programmable logic chip;

The analog signal end of sampling is connected with the input of variable connector with analog to digital converter AD by filter circuit.

The ROM that extends out is the AT49F1025 of ATMELD, and the RAM that extends out is Samsung memory K6X4008.

Liquid crystal display circuit adopts the T6963C LCD controller.

The utility model is taken all factors into consideration steady-state component route selection and transient state component route selection, effectively solves the low problem of original High Voltage Selective earth leakage protective device route selection accuracy rate.

Description of drawings

Fig. 1 is a syndeton schematic diagram of the present utility model.

Embodiment

As shown in Figure 1, the utility model comprises that the processing of finishing data, protection logic determines, switching value input control the main control unit circuit of communicating by letter with upper PC recorder data with output and liquid crystal display,

The analog signal end of sampling is connected with the input of variable connector with analog to digital converter AD by filter circuit.The ROM that extends out is the AT49F1025 of ATMELD, and the RAM that extends out is Samsung memory K6X4008.Liquid crystal display circuit adopts the T6963C LCD controller.

In this device, to adopt high performance INTEL80296SA microcontroller, and adopted 2 MAX125 to carry out 16 passage analog-to-digital conversion simultaneously, logic control and the operation of I/O mouth are finished by programmable logic device (CPLD).

Task such as communicate by letter with upper PC recorder data is controlled in the processing, protection logic determines, switching value input that the main control unit circuit is finished data and output and liquid crystal display, is the core of whole microcomputer line selection apparatus.

The main control unit circuit is made up of CPLD (EPM7128STC) two chips of INTEL80296 and ALTERA.Because 80296 have only inner 2kRAM, so need expansion ROM and RAM, extend out the AT49F1025 that ROM is ATMELD, extend out RAM and adopt Samsung memory K6X4008.In line selection apparatus, adopted the CPLD (EPM7128STC) of ALTERA company to come control logic to select, open in the logic control into the amount of leaving and liquid crystal display, adopt CPLD that the development time is shortened greatly, and because control logic able to programme, it is more convenient from element to use also score.

The collection and the conversion of signal are finished by MAX125.This device needs the analog signal of sampling to comprise every zero-sequence current and residual voltage signal that feeds out circuit.Adopted two MAX125 sampling A in this design, maximum 30 tunnel transformer stations that can sample feed out circuit.MAX125 is 2 * 4 passages, 14 bit data acquisition chips at a high speed, can be divided into two groups of A, B by the programming input eight passages are gathered, and the conversion of signals of each passage needs 3 μ s.The digital quantity of conversion gained all is stored among the RAM, reads by two-way data/address bus.The startup of MAX125 and EOC also are by the CPLD logic control, so just can reduce taking 80296 I/O mouth.

In order to improve the antijamming capability of protective device, after the amount of opening is isolated through photoelectricity, directly receive on the mouth line of CPLD chip; The amount of leaving then is the I/O mouth generation of elder generation by 80296 chips, after the expansion of CPLD chip, draws in favour of relay by the photoelectricity isolation.The man-machine interface circuit mainly is meant keyboard input, liquid crystal display circuit, and the main effect of this partial circuit is to finish the human-computer dialogue task by keyboard and LCD.The keyboard input circuit is made up of keyboard and CPLD, and LCD MODULE adopts the T6963C LCD controller.Because this device has the failure wave-recording function, at the scene the waveform of recording need send to upper PC by telecommunication circuit, the communication between microcontroller 80296 and the host computer is finished by the RS485 serial communication circuit.The interface control chip of RS485 bus communication mode adopts receiver transmitter chip MAX485 commonly used.

Transient state component and steady-state component are comprehensively examined algorithm, are its electric fault feature behind the generation single phase ground fault is divided into two parts, and promptly firm stage of development of fault (transient state component stage) and fault enter steady state phase (steady-state component stage).Because therefore two stage electrical characteristic differences, need to adopt different line selection algorithms, then two results are carried out logic determines and determine that finally guilty culprit feeds out circuit.For transient state stage employing transient current direction algorithm, this algorithm is that the integral mean of the mutual dot product of transient current is judged sense of current.And fault is in steady-state process employing admittance mutual deviation delta algorithm, and this algorithm carries out mutual deviation with the admittance of fault outgoing and non-fault outgoing and sues for peace the failure judgement circuit.

Claims

1, a kind of colliery High Voltage Selective earth leakage protective device comprises that processing, protection logic determines, the switching value input of finishing data control the main control unit circuit of communicating by letter with upper PC recorder data with output and liquid crystal display, it is characterized in that:

2, colliery according to claim 1 High Voltage Selective earth leakage protective device, it is characterized in that: the ROM that extends out is the AT49F1025 of ATMELD, the RAM that extends out is Samsung memory K6X4008.

3, colliery according to claim 1 High Voltage Selective earth leakage protective device is characterized in that: liquid crystal display circuit adopts the T6963C LCD controller.