CN201247298Y

CN201247298Y - Automatic recognizing instrument for relay protection differential vector

Info

Publication number: CN201247298Y
Application number: CNU2008201416226U
Authority: CN
Inventors: 罗喜群; 胡志刚
Original assignee: Tianjin Electric Power Corp
Current assignee: State Grid Corp of China SGCC; Tianjin Electric Power Corp
Priority date: 2008-08-18
Filing date: 2008-08-18
Publication date: 2009-05-27
Anticipated expiration: 2018-08-18

Abstract

The utility model relates to an automatic identification device of relay protection differential vectors, which belongs to the field of instruments, and is formed by a casing and a control circuit which is arranged in the casing, wherein the control circuit is formed by a singlechip, a power conversion module, a voltage channel, three current channels, a multipath analog-to-digital converter, a keyboard circuit, a memory, a liquid crystal display module and a communication module, wherein the singlechip is connected with the output end of the multipath analog-to-digital converter through a SPI interface, the input end of the multipath analog-to-digital converter is respectively connected with the voltage channel and the three current channels, and the singlechip is respectively connected with the keyboard circuit, the liquid crystal display module, the memory and the communication module through an I/O interface. The automatic identification device has the functions of synchronously measuring, automatically calculating and judging and automatically outputting test reports, which improves the accuracy and working quality of on-site vector measurement, lightens working intensity and working complex degree of on-site relay protecting staffs, saves a great amount of manpower and material resources, and has excellent safe benefits and economical benefits.

Description

The differential vectorial robotization identifier of relay protection

Technical field

The utility model relates to instrument field, the differential vectorial robotization identifier of especially a kind of relay protection.

Background technology

The relay protection vector is the important indicator of check differential protection loop wiring and current transformer polarity correctness, and the check of differential vector is equipment such as transformer and bus last the requisite important process that put into operation.How adapting to from the variation of electromagnetic protection to Microcomputer Protection transition differential protection wiring and vector, how to improve the automatization level of relay protection vector measurement, the difficulty that alleviates professional's work on the spot and labour intensity, is that the staff is desired.

At present at the scene in the real work, the relay protection personnel when doing transformer differential protection or bus differential protecting vector, general adopt to measure add the method that hand computation combines.Concrete grammar is to use common vector table to insert a voltage as reference voltage; measure respectively with the clamp table then and insert each electric current of differential protection loop, judge the correctness of protection phasor then by picture phasor graph and Calculation Method with respect to the phase place of reference voltage and the amplitude of each road electric current.There are the following problems for the method: 1. remain unchanged on the reference voltage surface, but the phase place of reference voltage is to change constantly when measuring each road electric current, promptly causes measuring error by fiducial error; 2. owing to each road electric current of differential circuit needs to measure respectively, each road current is to change constantly, and measurement is constantly inconsistent must to cause measuring error; 3. for multiple-winding transformer, different and angled variation owing to each side electric pressure is calculated at the scene and there is difficulty in judgement.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of have synchro measure function, the automatic differential vectorial robotization identifier of relay protection of judging and can improving measuring accuracy that calculates are provided.

The utility model solves its technical matters and takes following technical scheme to realize:

The differential vectorial robotization identifier of a kind of relay protection; constitute by casing and inner control circuit thereof; on casing, be provided with button; LCD; it is characterized in that: the control circuit in the casing is by single-chip microcomputer; power transfer module; a voltage channel; three current channels; the multichannel analog to digital converter; keyboard circuit; storer; LCD MODULE and communication module constitute; power transfer module is the control circuit power supply; single-chip microcomputer is connected by the output terminal of SPI interface with the multichannel analog to digital converter; the input end of multichannel analog to digital converter respectively with a voltage channel; three current channels are connected; single-chip microcomputer by the I/O interface respectively with keyboard circuit; LCD MODULE; storer and communication module are connected, voltage channel; current channel; keyboard circuit; LCD MODULE and communication module respectively with casing on the voltage tester mouth; the testing current mouth; button; LCD and serial communication port are connected.

And described single-chip microcomputer is ATMEL 89 series monolithics, and the multichannel analog to digital converter is 24 analog to digital converter ADS1216 of 8 passages chip, and storer is the E of 24CXX series ²PROM, display control module are the MGLS12864 module.

Advantage of the present utility model and good effect are:

1. this automatic identifier is provided with three road electric current input ports, three road voltage inputs, its inner control circuit can be gathered each road current amplitude and phase place and the automatic record that inserts differential relay simultaneously, the ability that has possessed each road electric current of measuring differential circuit simultaneously, guaranteed voltage reference and Ge Lu current sample consistance constantly, avoided measuring the problem that difference constantly causes measuring error, and, can be converted to the same side to the amplitude of each road electric current of differential circuit and phase place automatically according to the parameter of prior setting calculates, solved that the measuring basis amount changes constantly when measuring each road electric current, promptly because fiducial error causes the problem of measuring error.

2. this automatic identifier is on the basis of inserting each loop current conversion of differential protection; automatically calculate and draw the vector plot of each road electric current of differential circuit; automatically provide the result of differential vector measurement correctness; possessed automatic computational discrimination function; realize calculating automatically and judging automatically vectorial correctness function; solved for multiple-winding transformer because each side electric pressure difference and wiring group difference, calculated at the scene and judge complicated loaded down with trivial details problem.

3. this automatic identifier is provided with three kinds of measurement patterns of " YY " " Y △ " " YY △ ", can deposit the data that each side is measured in buffer zone, then analysis result is calculated, exported to the data that deposit buffer zone in and deposit in the instrument memory block, can show the size and the vector relations each other of a side electric current intuitively.

4, this automatic identifier is provided with serial communication port, test result can be transferred on the computing machine to realize exporting automatically the function of test report, the differential vector test report that will comprise information such as test data, vector plot, test result, test duration and personnel on computers prints or stores, realize computerized management, taken leave of the history of past on-site manual record and hand-written report.

5. the utility model has possessed synchro measure, computational discrimination and export the function of test report automatically automatically; taken leave of the history of pursuing measurement mutually, troublesome calculation and hand-written report in the past; realized the robotization of the differential vector measurement work of on-the-spot relay protection; improve the accuracy and the work quality of on-the-spot vector measurement; avoid vectorial mistake to cause the generation of security incident; on-the-spot relay protection personnel labor intensity and work complexity have been alleviated; save great amount of manpower and material resources, had good safety benefit and economic benefit.

Description of drawings

Fig. 1 is a schematic appearance of the present utility model;

Fig. 2 is a control circuit block scheme of the present utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model embodiment is further described:

The differential vectorial robotization identifier of this relay protection is made of casing and inner control circuit thereof; wherein; the structure of casing is: be provided with LCD 2 and one group of button on the front panel 7 of casing; these buttons comprise function key 3; power switch key 6; digital symbol key 8; page turning and acknowledgement key 9 etc.; be provided with three road voltage tester mouths and three road testing current mouths 1 at the top of casing; ground connection mouth 4 and serial communication port 5; three road voltage tester mouths and ground connection mouth are connected with circuit-under-test by four-core voltage cover line; three road testing current mouths are connected with circuit-under-test by the split core type current transformer that is inserted in wherein respectively; this split core type current transformer is a MG10 type split core type current transformer, and serial communication port is connected with the computing machine that automatic identifier management software is installed by the communications cable.

Control circuit in the casing is by single-chip microcomputer, power transfer module, a voltage channel, three current channels, the multichannel analog to digital converter, keyboard circuit, storer, LCD MODULE and communication module constitute, the power source conversion that power transfer module can provide the outside is the needed power supply of control circuit, and be that control circuit is powered, single-chip microcomputer is connected by the output terminal of SPI interface with the multichannel analog to digital converter, the input end of multichannel analog to digital converter respectively with a voltage channel, three current channels are connected, a voltage channel is provided with precision resistance isolates three road voltage mutually insulateds that input voltage carries out dividing potential drop and access, and three current channels use the split core type current transformer mode to import respectively.Single-chip microcomputer is connected with keyboard circuit, LCD MODULE, storer and communication module respectively by the I/O interface, and voltage channel, current channel, keyboard circuit, LCD MODULE and communication module are connected with three voltage tester mouths, three testing current mouths, button, LCD and serial communication ports on the casing respectively.Above-mentioned single-chip microcomputer is ATMEL 89 series monolithics, and the multichannel analog to digital converter is 24 analog to digital converter ADS1216 of 8 passages chip, and storer is the E of 24CXX series ²PROM, display control module are the MGLS12864 module.

The principle of work of this automatic identifier is: insert the multichannel analog to digital converter after the precision resistance dividing potential drop of measured alternating voltage in voltage channel, the AC signal of measured ac current signal after the clamp current transformer conversion is access in the multichannel analog to digital converter simultaneously, the multichannel analog to digital converter is under the control of single-chip microcomputer, above-mentioned analog AC signal is sampled and analog to digital conversion and being admitted in the single-chip microcomputer by 4000 times/second sampling rates, like this, guaranteed each road voltage, current sample consistance constantly.Single-chip microcomputer can also be according to " YY " that select in advance, " Y △ ", " YY △ " three kinds of measurement patterns are carried out numerical analysis to the sampled signal that receives, calculate various electrical quantity amount information, result calculated is come out by liquid crystal display displays, comprise the size and the vector relations each other that show each side electric current intuitively, can also will be connected with the computing machine that automatic identifier management software is installed among data that measure or the result calculated storage EEPROM and by serial communication port, realization is transferred to the function of exporting test report on the computing machine and automatically with test result, will comprise test data on computers, vector plot, test result, the differential vector test report of information such as test duration and personnel prints or stores.

It is emphasized that; embodiment described in the utility model is illustrative; rather than it is determinate; therefore the utility model is not limited to the embodiment described in the embodiment; every by those skilled in the art according to other embodiments that the technical solution of the utility model draws, belong to the scope of the utility model protection equally.

Claims

1. differential vectorial robotization identifier of relay protection; constitute by casing and inner control circuit thereof; on casing, be provided with button; LCD; it is characterized in that: the control circuit in the casing is by single-chip microcomputer; power transfer module; a voltage channel; three current channels; the multichannel analog to digital converter; keyboard circuit; storer; LCD MODULE and communication module constitute; power transfer module is the control circuit power supply; single-chip microcomputer is connected by the output terminal of SPI interface with the multichannel analog to digital converter; the input end of multichannel analog to digital converter respectively with a voltage channel; three current channels are connected; single-chip microcomputer by the I/O interface respectively with keyboard circuit; LCD MODULE; storer and communication module are connected, voltage channel; current channel; keyboard circuit; LCD MODULE and communication module respectively with casing on the voltage tester mouth; the testing current mouth; button; LCD and serial communication port are connected.

2. the differential vectorial robotization identifier of relay protection according to claim 1; it is characterized in that: described single-chip microcomputer is ATMEL 89 series monolithics; the multichannel analog to digital converter is 24 analog to digital converter ADS1216 of 8 passages chip, and storer is the E of 24CXX series ²PROM, display control module are the MGLS12864 module.