CN2755767Y

CN2755767Y - Checker of gas relay

Info

Publication number: CN2755767Y
Application number: CN 200420099235
Authority: CN
Inventors: 白伟义
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-12-25
Filing date: 2004-12-25
Publication date: 2006-02-01
Anticipated expiration: 2014-12-25

Abstract

The utility model relates to a checking instrument for a gas relay in power systems, which comprises a shell body. A tension sensor, a control circuit board, and a stepping motor are arranged in the inner cavity of the shell body, wherein the control circuit board is provided with an analogue-digital converter and a single chip computer, and the top surface of the shell body is provided with an inserting hole for test lines, a digital display, and an operation keyboard; a signal output end of the tension sensor is connected with an input end of the analogue-digital converter, and the tension sensor is fixedly connected with a pull line; the other end of the pull line is connected to a measuring hole on a baffle plate of a gas relay, and an output shaft of the stepping motor is connected with a gear transmission mechanism; an output shaft of the gear transmission mechanism is a screw rod, and the screw rod is connected with nuts; the nuts are fixedly connected with the tension sensor, peripheries of the screw rod are sheathed with a nut guide sleeve and the upper end of the guide sleeve is slotted. The checking instrument has the advantages of high checking precision, no pollution of oil stain and convenient operation.

Description

A kind of Buchholz relay tester

Technical field

The utility model relates to the Buchholz relay tester that a kind of electric power system is used.

Background technology

Buchholz relay claims Buchholz relay again, and electric power system is to the verification mode of Buchholz relay, and the most frequently used has two kinds, and first kind is moment indirect experiment method such as employing, claims to hang the counterweight experimental method again, and second kind is to adopt Buchholz relay flow velocity experimental bench.The former deficiency is manual operation, and randomness is big, and different operators can obtain different data with different number of operations, thereby measure error is big, and verification is inaccurate; Though the accuracy height of latter's verification, the each verification of operator all will touch greasy dirt, and is both unhygienic, inconvenient again, is not subjected to operator's welcome.The patent No. be 03253213.X's " a kind of Buchholz relay tester ", the force application rod that comprises the level trend, be connected to force application component on the force application rod, end linking at force application rod has pulling force sensor, the signal output part of pulling force sensor is electrically connected with the signal input part of digital indicator formation, also comprise backguy, the oil pipe mouth that an end of this backguy can be connected with pulling force sensor, other end energy level is passed Buchholz relay with moving towards is connected on the baffle plate of Buchholz relay.With this patented technology verification Buchholz relay, though there is not oil pollution, be the artificial pulling application of force owing to act on " the power source " of force application rod, troublesome poeration, smoothness is poor, and this is one of drawback; Need whole Buchholz relay shell auxiliary when two of drawback is verification, this just makes the verification wiring very inconvenient with the debugging definite value.

Summary of the invention

The purpose of this utility model provides a kind of not only do not had oil pollution, verification accuracy height, operation but also easy Buchholz relay tester.

In order to realize above-mentioned purpose, this Buchholz relay tester, comprise that an end is hinged with the housing of univalve door, in the inner chamber of housing pulling force sensor is housed, on the inwall of housing control circuit board is housed, be equipped with on the control circuit board and constitute analog to digital converter and the single-chip microcomputer that is electrically connected, the p-wire jack is housed on the end face of housing and constitutes the digital display that is electrically connected with single-chip microcomputer, operation keyboard and mains switch, the signal output part of pulling force sensor is connected with the input of analog to digital converter, on pulling force sensor, be connected with backguy, the other end of backguy can level be engaged on the measured hole of Buchholz relay baffle plate with moving towards, its design feature is that stepping motor also is housed in the inner chamber of housing, be connected to gear drive on the output shaft of this stepping motor, the output shaft of this gear drive is a leading screw, the leading screw frame is having on two supports of bearing, two supports are fixed on the housing bottom surface, be connected with nut on the leading screw, nut and pulling force sensor are affixed, the leading screw outer race is equipped with the nut fairlead of upper end fluting, and the nut fairlead is fixed on two supports.

Above-mentioned Buchholz relay tester also comprises a plate, and this connecting plate is fixed on the nut, and pulling force sensor is fixed on the connecting plate.

Above-mentioned Buchholz relay tester comprises the strain plate affixed with pulling force sensor again, on this strain plate guy hook is housed, and backguy is fixed on this guy hook.

As improvement to this Buchholz relay tester, in the inner chamber of housing, be provided with the Internal baffle that is fixed on the housing bottom surface, have centre bore on the Internal baffle, guy hook passes overhanging from this centre bore.

As further improvement, in the inner chamber of housing, also be provided with the drawer type telescoping bracket of the placement Buchholz relay movement that is connected with the front inside wall and the back side inwall of housing to this Buchholz relay tester.

When adopting this Buchholz relay tester to the Buchholz relay verification, open the univalve door hinged earlier with the housing of tester, pull out telescoping bracket, to be placed on the telescoping bracket by the Buchholz relay movement of verification, on two binding posts that an end of two p-wires inserts in the p-wire jack respectively, the other end is clipped in the Buchholz relay contact, the other end of backguy is received on the measured hole of Buchholz relay baffle plate.After the energized, rotate by the Single-chip Controlling stepping motor, drive leading screw by gear drive and rotate, the rotation of leading screw forces the nut displacement, produces pulling force, drive pulling force sensor, backguy synchronous shift, gathered in real time and record pulling force data and the continuous contact that detects Buchholz relay by single-chip microcomputer, when Buchholz relay moved, the Single-chip Controlling stepping motor stopped operating, at this moment, the flow velocity setting value that shows value of thrust and Buchholz relay by digital display.Then, single-chip microcomputer sends the control signal that makes the stepping motor counter-rotating, and gear drive is resetted.

The pulling force transmission of quantity value source of Buchholz relay tester described in the utility model can be proofreaded with counterweight by national standard, guarantees tester self error within the limits prescribed.

With this Buchholz relay tester Buchholz relay is carried out verification, its beneficial effect is: 1, owing to adopt the drawer type carrier structure, be convenient to portable, debugging, easy-to-connect; 2, adopt stepping motor and to the feed screw nut of the steady application of force of pulling force sensor, make tune-up data stable, verification accuracy height has improved the work comfort level; 3, directly do not touch greasy dirt, no oil pollution.

Description of drawings

Embodiment of the present utility model is illustrated in conjunction with the accompanying drawings, wherein:

Fig. 1 is the structural representation of the described Buchholz relay tester of embodiment;

Fig. 2 is the vertical view of Fig. 1;

Fig. 3 is the electrical equipment control block diagram of Buchholz relay tester.

Among the figure, 1 is univalve door, and 2 is housing, 3 is pulling force sensor, and 4 is control circuit board, 5 analog to digital converters, 6 is single-chip microcomputer, and 7 is the p-wire jack, and 8 is digital display, 9 is operation keyboard, and 10 is mains switch, and 11 are backguy, 12 is stepping motor, and 13 is driving gear, and 14 is driven gear, 15 is leading screw, and 16 is support, and 17 is nut, 18 is the nut fairlead, and 19 is connecting plate, and 20 is strain plate, 21 is guy hook, 22 is Internal baffle, and 23 is the drawer type telescoping bracket, and 24 is the Buchholz relay movement, 25 is the Buchholz relay baffle plate, and 26 is lead.

Embodiment

With reference to accompanying drawing, the described Buchholz relay tester of present embodiment, comprise that an end is hinged with the housing 2 of univalve door 1, pulling force sensor 3 is housed in the inner chamber of housing 2, control circuit board 4 is housed on the inwall of housing 2, be equipped with on the control circuit board 4 and constitute analog to digital converter 5 and the single-chip microcomputer 6 that is electrically connected, p-wire jack 7 is housed on the end face of housing 2 and constitutes the digital display 8 that is electrically connected with single-chip microcomputer 6, operation keyboard 9 and mains switch 10, the signal output part of pulling force sensor 3 is connected by lead 26 with the input of analog to digital converter 5, on pulling force sensor 3, be connected with strain plate 20, on this strain plate 20 guy hook 21 is housed, the centre bore that guy hook 21 passes on the Internal baffle 22 is overhanging, Internal baffle 22 is fixed on housing 2 bottom surfaces, on guy hook 21, be connected to backguy 11, the other end of backguy 11 can level be engaged on the measured hole of Buchholz relay baffle plate 25 with moving towards, stepping motor 12 and the drawer type telescoping bracket 23 that is provided with the placement Buchholz relay movement 24 that is connected with the front inside wall and the back side inwall of housing 2 also are housed in the inner chamber of housing 2, be connected to gear drive on the output shaft of stepping motor 12, gear drive constitutes by driving gear 13 with the driven gear 14 of driving gear 13 engagement, driven gear 14 is fixed on the leading

screw

15,15 of leading screws are having on two supports 16 of bearing, two supports 16 are fixed on housing 2 bottom surfaces, be connected with nut 17 on the leading screw 15, on nut 17, be connected with connecting plate 19, pulling force sensor 3 is fixed on the connecting plate 19, leading screw 15 outer race are equipped with the nut fairlead 18 of upper end fluting, and nut fairlead 18 is fixed on two supports 16.

In the present embodiment, stepping motor 12 is selected 35BYG type composite stepper motor for use, and pulling force sensor 3 is selected LC-A-B for use, and analog to digital converter 5 is selected AD7705 for use, and single-chip microcomputer 6 selects for use 51 single-chip microcomputers as CPU, and digital display 8 is selected lattice lcd display for use.Above-mentioned components and parts are owing to be known technology, thereby not in carefully stating.

Claims

1, a kind of Buchholz relay tester, comprise that an end is hinged with the housing of univalve door (1) (2), pulling force sensor (3) is housed in the inner chamber of housing (2), control circuit board (4) is housed on the inwall of housing (2), be equipped with on the control circuit board (4) and constitute analog to digital converter (5) and the single-chip microcomputer (6) that is electrically connected, p-wire jack (7) is housed on the end face of housing (2) and constitutes the digital display (8) that is electrically connected with single-chip microcomputer (6), operation keyboard (9) and mains switch (10), the signal output part of pulling force sensor (3) is connected with the input of analog to digital converter (5), on pulling force sensor (3), be connected with backguy (11), the other end of backguy (11) can level be engaged on the measured hole of Buchholz relay baffle plate (25) with moving towards, it is characterized in that in the inner chamber of housing (2), also being equipped with stepping motor (12), be connected to gear drive on the output shaft of this stepping motor (12), the output shaft of this gear drive is a leading screw (15), leading screw (15) frame is having on two supports (16) of bearing, two supports (16) are fixed on housing (2) bottom surface, be connected with nut (17) on the leading screw (15), nut (17) is affixed with pulling force sensor (3), leading screw (15) outer race is equipped with the nut fairlead (18) of upper end fluting, and nut fairlead (18) is fixed on two supports (16).

2, Buchholz relay tester according to claim 1 is characterized in that also comprising a plate (19), and this connecting plate (19) is fixed on the nut (17), and pulling force sensor (3) is fixed on the connecting plate (19).

3, Buchholz relay tester according to claim 1 and 2 is characterized in that and comprises and strain plate (20) that pulling force sensor (3) is affixed that guy hook (21) is housed on this strain plate (20), and backguy (11) is fixed on this guy hook (21).

4, Buchholz relay tester according to claim 3 is characterized in that being provided with the Internal baffle (22) that is fixed on housing (2) bottom surface in the inner chamber of housing (2), Internal baffle has centre bore on (22), and guy hook (21) passes overhanging from this centre bore.

5, Buchholz relay tester according to claim 1 and 2 is characterized in that also being provided with the drawer type telescoping bracket (23) of the placement Buchholz relay movement (24) that is connected with the front inside wall and the back side inwall of housing (2) in the inner chamber of housing (2).