CN2842442Y

CN2842442Y - Automatic detecting apparatus for oil charged-degree of trans former

Info

Publication number: CN2842442Y
Application number: CN 200520085809
Authority: CN
Inventors: 王志广; 刘长生
Original assignee: ZIBO ZHONGHUI INSTRUMENT CO Ltd
Current assignee: ZIBO ZHONGHUI INSTRUMENT CO Ltd
Priority date: 2005-07-23
Filing date: 2005-07-23
Publication date: 2006-11-29
Anticipated expiration: 2015-07-23

Abstract

The utility model provides an automatic detecting apparatus for oil charged degree of a transformer, which comprises a machine frame, oil nozzles which are installed on the machine frame and capable of moving up and down, and a test disk which is arranged below the oil nozzles and capable of rotating horizontally, wherein the oil nozzles are connected to the oil of the transformer by an oil guide pipe. The utility model is characterized in that a plurality of test heads are arranged at the same circumference of the test disk; the test disk and the test heads are electric conductors; the middles of the test heads are provided with oil channels which are consistent with the oil nozzles; a layer of filter paper is transversely arranged in each oil channel; a signal processing module is added in each oil channel; a signal input terminal of the signal processing module is arranged on the test disk, and a signal output terminal is connected with a single chip machine. When the utility model is used for testing, the test disk rotates to make the test head rotate to the testing position, and the oil nozzles descend to be combined with the test heads. Thus, an oil sample has friction with the filter paper when flowing through the test heads. Thus weak electrical signals can be generated to be input to the single chip machine after the weak electrical signals are magnified by the signal processing module, and the required oil charged degree of the transformer is obtained. The whole test process is completely intellectualized, and the utility model has the advantages of accurate measurement and high testing efficiency.

Description

Transformer oil electrified degree automatic detection device

Affiliated technical field

The utility model provides a kind of transformer oil electrified degree automatic detection device, belongs to the electric measuring instrument technical field.

Background technology

The safe operation of oil-filled power transformer is the important topic that power supply department is faced.Because the insulating property of transformer oil are subjected to the influence of several factors, such as moisture, impurity, temperature, the charged degree of oil itself etc. for guaranteeing the transformer safe and stable operation, need instant its every index of correlation that detects.Wherein, owing to the friction between transformer oil and transformer inwall and the inner insulation material produces electric charge, promptly insulating oil is charged, thereby causes its insulating property to reduce, and influences the safe operation of transformer, more and more is subject to people's attention.How to know the charged degree of transformer insulation oil, many methods are arranged both at home and abroad, as pipe round-robin method, circulating injection method, siphonage, " mini " electrostatic test method etc.,, also inequality between the whole bag of tricks to the measurement result of same insulating oil owing to principle, evaluation method difference." mini " electrostatic test method is easy, easy-to-use, measures accurately, and domestic existing employing, but all be manual operations, need to repeat manual sampling, the manual compression test, and manually read the measuring current data and calculated, process is loaded down with trivial details, and efficient is lower.

The utility model content:

The transformer oil electrified degree automatic detection device that the purpose of this utility model provides a kind ofly can overcome above-mentioned defective, measure accurately, testing efficiency is high.Its technology contents is:

Comprise frame, be installed in the pump nozzle that can move up and down on the frame and be positioned at the test panel that can horizontally rotate under the pump nozzle, wherein pump nozzle connects transformer oil through oil guide pipe, it is characterized in that: the same circumference of test panel is provided with a plurality of measuring heads, test panel and measuring head are electric conductor, the centre of measuring head is provided with the oil duct that matches with pump nozzle, laterally be provided with one deck filter paper in the oil duct, set up signal processing module, its signal input terminal is arranged on the test panel, and its output terminal connects single-chip microcomputer.

Described transformer oil electrified degree automatic detection device, frame is provided with three layers of back up pad, between top layer and middle level back up pad, be fixed with guide, drive unit comprises vertical drive that is installed on the top layer back up pad and the electric rotating machine that is installed on the back up pad of middle level, pump nozzle is installed in the guide and is moved up and down by the vertical drive driving, test panel is fixed on the output shaft of electric rotating machine, holder is provided with insulating mat between test panel and the base layer support plate around its bottom on the base layer support plate.

Described transformer oil electrified degree automatic detection device, vertical drive adopts lifting motor, the terminal screw rod middle with being positioned at guide of its motor shaft fixedlyed connected, screw rod be positioned at guide, the guide nut thread that is sleeved on the screw rod connects, the guide nut is provided with backing pin, be vertically arranged with guide groove on the corresponding guide with it, the backing pin level passes guide groove, and along with moving up and down in the guide groove inter-sync of guide nut moved, pump nozzle is installed in the below that is positioned at the guide nut in the guide, its bottom passes the middle level back up pad, is pressed with spring between the upper surface of pump nozzle and the guide nut, is pressed with the bootstrapping spring between its lower surface and the middle level back up pad.

Described transformer oil electrified degree automatic detection device, in the middle of comprising, measuring head is provided with housing screw that runs through oil duct and the nut that is threaded with housing screw, it is with holes that the bottom of nut is taper, constitute oil outlet, crimping place that is positioned at housing screw lower surface and nut at oil duct is provided with filter paper and O-ring seal.

Described transformer oil electrified degree automatic detection device, vertical drive adopts hydraulic cylinder, and the end of its plunger is fixedlyed connected with pump nozzle.

Described transformer oil electrified degree automatic detection device, signal processing module comprises amplifier IC1～2, resistance R 1～7 and adjustable resistance P1～2, the in-phase input end ground connection of amplifier IC1 wherein, its inverting input connects test panel, its output terminal connects the reverse inter-input-ing ending grounding of amplifier IC2 through resistance R 6, its in-phase input end connects the adjustable end that meets adjustable resistance P1 through resistance R 7, the two ends correspondence in addition of adjustable resistance P1 connects positive supply through resistance R 2, connect negative supply through resistance R 3, through adjustable resistance P2 and resistance R 4 ground connection, the junction of adjustable resistance P2 and resistance R 4 meets single-chip microcomputer U1 as signal output part to the output terminal of amplifier IC2 successively.

Its principle of work is: during test, test panel rotates the bottom that is positioned at pump nozzle after measuring head rotates to the test position just, pump nozzle descends tight with the oil duct at measuring head center, combination securely, when oil sample at the uniform velocity flows through measuring head and filter paper produce friction, just produce faint electric signal, test panel and measuring head are electric conductor, electric signal just outputs to signal processing module by the signal input terminal that is installed on the test panel, by outputing to single-chip microcomputer after the signal processing module processing and amplifying, after the single-chip microcomputer computing, can show or print desired transformer oil electrified degree value.A measuring head end of test (EOT), pump nozzle lifts, and the test panel rotation makes next measuring head be positioned at the test position, repeats said process, and the rest may be inferred.

The utility model compared with prior art, whole test process is all intelligent, need not manual operations and artificial calculating, measures accurately, testing efficiency is high.

Description of drawings

Fig. 1 is the structural representation of mechanical part among the utility model embodiment;

Fig. 2 is the structural representation of middle test panel embodiment illustrated in fig. 1;

Fig. 3 is the structural representation of middle measuring head embodiment illustrated in fig. 1;

Fig. 4 is the circuit diagram of signal processing module among the utility model embodiment.

Embodiment

1, frame 2, vertical drive 3, back up pad 4, guide 5, screw rod 6, guide nut 7, oil guide pipe 8, spring 9, bootstrapping spring 10, guide groove 11, backing pin 12, pump nozzle 13, rubber ring 14, electric rotating machine 15, output shaft 16, test panel 17, oil duct 18, measuring head 19, insulating mat 20, signal input terminal 21, housing screw 22, nut 23, oil duct 24, O-ring seal 25, filter paper 26, oil outlet

Among the embodiment shown in Fig. 1～3: frame 1 is provided with three layers of back up pad 3, between top layer and middle level back up pad 3, be fixed with guide 4, vertical drive 2 adopts lifting motor to be installed on the top layer back up pad 3, its motor shaft end is fixedlyed connected with the screw rod 5 in the middle of being positioned at guide 4, screw rod 5 be positioned at guide 4, the guide nut 6 that is sleeved on the screw rod 5 is threaded, guide nut 6 is provided with backing pin 11, be vertically arranged with guide groove 10 on the corresponding guide 4 with it, backing pin 11 levels pass guide groove 10, and along with moving up and down in guide groove 10 inter-syncs of guide nut 6 moved, pump nozzle 12 is installed in the below that is positioned at guide nut 6 in the guide 4, its bottom passes middle level back up pad 3, be pressed with spring 8 between the upper surface of pump nozzle 12 and the guide nut 6, be pressed with bootstrapping spring 9 between its lower surface and the middle level back up pad 3, the oil duct 17 in the pump nozzle 12 passes guide 4 through oil guide pipe 7 and connects transformer oil.Electric rotating machine 14 is installed on the middle level back up pad 3, test panel 16 is fixed on the output shaft 15 of electric rotating machine 14, holder is on base layer support plate 3 around its bottom, be provided with insulating mat 19 between test panel 16 and the base layer support plate 3, the same circumference of test panel 16 is provided with 4 measuring heads 18, test panel 16 and measuring head 18 are electric conductor, in the middle of including, each measuring head 18 is provided with housing screw 21 that runs through oil duct 23 and the nut 22 that is threaded with housing screw 21, it is with holes that the bottom of nut 22 is taper, constitute oil outlet 26, crimping place that is positioned at housing screw 21 lower surfaces and nut 22 at oil duct 23 is provided with filter paper 25 and O-ring seal 24, and the top of oil duct 23 and pump nozzle 12 match.Set up signal processing module, its signal input terminal 20 is arranged on the test panel 16, and its output terminal meets single-chip microcomputer U1.

In the embodiment shown in fig. 4: signal processing module comprises amplifier IC1～2, resistance R 1～7 and adjustable resistance P1～2, the in-phase input end ground connection of amplifier 1C1 wherein, its inverting input connects the signal input terminal 20 on the test panel 16, its output terminal connects the reverse inter-input-ing ending grounding of amplifier IC2 through resistance R 6, its in-phase input end connects the adjustable end of adjustable resistance P1 through resistance R 7, the two ends correspondence in addition of adjustable resistance P1 connects positive supply through resistance R 2, connect negative supply through resistance R 3, through adjustable resistance P2 and resistance R 4 ground connection, the junction of adjustable resistance P2 and resistance R 4 meets single-chip microcomputer U1 as signal output part to the output terminal of amplifier IC2 successively.

During test, at first start electric rotating machine 14, driving test panel 16 rotates and measuring head 18 is forwarded to be positioned at the test position of pump nozzle 12 bottoms to stop, restart lifting motor, screw rod 5 rotates with motor shaft, because backing pin 11 and the vertically guide effect of guide groove 10 make guide nut 6 to move down in guide 4.When moving down, guide nut 6 is through spring 8 compressing pump nozzles 12, pump nozzle 12 is descended be pressed on the measuring head 18 oil duct 23 tight with measuring head 18 centers, combination securely, pump nozzle 12 beginning oilings in oil duct 23, filter paper 25 when oil sample at the uniform velocity flows through measuring head 18 and in the oil duct 23 produces friction, just produce faint electric signal, because test panel 16 is electric conductor with measuring head 18, electric signal just outputs to signal processing module by the signal input terminal 20 that is installed on the test panel 16, by outputing to single-chip microcomputer U1 after the signal processing module processing and amplifying, after single-chip microcomputer U1 computing, can show or print desired transformer oil electrified degree value.Measuring head 18 end of test (EOT), pump nozzle 12 lifts, and test panel 16 rotations make next measuring head 18 be positioned at the test position, repeat said process, and the rest may be inferred.

Claims

1, a kind of transformer oil electrified degree automatic detection device, comprise frame (1), be installed in the pump nozzle (12) that can move up and down on the frame (1) and be positioned at the test panel (16) that can horizontally rotate under the pump nozzle (12), wherein pump nozzle (12) connects transformer oil through oil guide pipe (7), it is characterized in that: the same circumference of test panel (16) is provided with a plurality of measuring heads (18), test panel (16) and measuring head (18) are electric conductor, the centre of measuring head (18) is provided with the oil duct (23) that matches with pump nozzle (12), laterally be provided with one deck filter paper (25) in the oil duct (23), set up signal processing module, its signal input terminal (20) is arranged on the test panel (16), and its output terminal connects single-chip microcomputer.

2, transformer oil electrified degree automatic detection device as claimed in claim 1, it is characterized in that: frame (1) is provided with three layers of back up pad (3), between top layer and middle level back up pad (3), be fixed with guide (4), drive unit comprises the vertical drive (2) that is installed on the top layer back up pad (3) and is installed in electric rotating machine (14) on the middle level back up pad (3), pump nozzle (12) is installed in the guide (4) and is moved up and down by vertical drive (2) driving, test panel (16) is fixed on the output shaft (15) of electric rotating machine (14), holder is provided with insulating mat (19) between test panel (16) and the base layer support plate (3) around its bottom on base layer support plate (3).

3, transformer oil electrified degree automatic detection device as claimed in claim 2, it is characterized in that: vertical drive (2) adopts lifting motor, the terminal screw rod (5) middle with being positioned at guide (4) of its motor shaft fixedlyed connected, screw rod (5) be positioned at guide (4), the guide nut (6) that is sleeved on the screw rod (5) is threaded, guide nut (6) is provided with backing pin (11), be vertically arranged with guide groove (10) on the corresponding guide with it (4), backing pin (11) level passes guide groove (10), and along with moving up and down in guide groove (10) inter-sync of guide nut (6) moved, pump nozzle (12) is installed in the below that is positioned at guide nut (6) in the guide (4), its bottom passes middle level back up pad (3), be pressed with spring (8) between the upper surface of pump nozzle (12) and the guide nut (6), be pressed with bootstrapping spring (9) between its lower surface and the middle level back up pad (3).

4, transformer oil electrified degree automatic detection device as claimed in claim 1, it is characterized in that: be provided with housing screw (21) that runs through oil duct (23) and the nut (22) that is threaded with housing screw (21) in the middle of measuring head (18) comprises, it is with holes that the bottom of nut (22) is taper, constitute oil outlet (26), crimping place that is positioned at housing screw (21) lower surface and nut (22) at oil duct (23) is provided with filter paper (25) and O-ring seal (24).

5, transformer oil electrified degree automatic detection device as claimed in claim 2 is characterized in that: vertical drive (2) adopts hydraulic cylinder, and the end of its plunger is fixedlyed connected with pump nozzle (12).

6, transformer oil electrified degree automatic detection device as claimed in claim 1, it is characterized in that: signal processing module comprises amplifier IC1～2, resistance R 1～7 and adjustable resistance P1～2, the in-phase input end ground connection of amplifier IC1 wherein, its inverting input connects the signal input terminal (20) that is arranged on the test panel (16), its output terminal connects the reverse inter-input-ing ending grounding of amplifier IC2 through resistance R 6, its in-phase input end connects the adjustable end that meets adjustable resistance P1 through resistance R 7, the two ends correspondence in addition of adjustable resistance P1 connects positive supply through resistance R 2, connect negative supply through resistance R 3, through adjustable resistance P2 and resistance R 4 ground connection, the junction of adjustable resistance P2 and resistance R 4 meets single-chip microcomputer U1 as signal output part to the output terminal of amplifier IC2 successively.