CN2170529Y - Isolator string low-zero magnetic bottle detector - Google Patents
Isolator string low-zero magnetic bottle detector Download PDFInfo
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- CN2170529Y CN2170529Y CN 93224548 CN93224548U CN2170529Y CN 2170529 Y CN2170529 Y CN 2170529Y CN 93224548 CN93224548 CN 93224548 CN 93224548 U CN93224548 U CN 93224548U CN 2170529 Y CN2170529 Y CN 2170529Y
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Abstract
The utility model relates to the technical field of high voltage. A person on the conducting wire of a high voltage line uses the utility model to measure the insulation resistance of the porcelain insulator of the high voltage power line. The utility model uses the basic principle that a resistance is measured through a volt-ampere method. A dry cell is used as a power supply. The utility model adopts the modern electronic technology and electronic components to be made. The utility model relates to a 2500V insulation resistance measurer which can be put in a clothes pocket to be carried. The effective range of the utility model is 0-1000 Momega. The operation is simple and convenient. The utility model is especially suitable for measuring a porcelain insulator with a low value or a zero value when a power line encounters power failure, and the porcelain insulator is cleared. The utility model can also be used for measuring the insulation resistance of high-voltage power equipment.
Description
The utility model relates to the High-Voltage Technology field, is a kind of new instrument that the insulator dielectric resistance measurement is used.Be applicable in the high-altitude the insulation measurement of high-voltage electric power circuit and transmission transformer station aerial condutor usefulness insulator.
Along with developing rapidly of electric system, the high-tension porcelain insulator quantity that power circuit and transmission transformer station are used heightens.High-tension porcelain insulator is under long-term effect such as highfield and mechanical load, temperature, aging gradually insulation resistance reduction the becoming low value porcelain vase that makes of insulating property, even the porcelain insulator resistance vanishing that has becomes the null value porcelain vase, the voltage that these low null value porcelain vases are shared in insulator chain reduces or shares voltage is zero, the voltage increases that other porcelain vase is shared, quickened the aging of porcelain vase on the one hand, reduced the flashover voltage of insulator chain on the one hand, made the tripping operation and the power outage increased frequency of circuit.Security of operation to electric system is a kind of very big threat.The existence of low null value porcelain vase is a kind of potential hidden danger in the insulator chain, so relevant rules are stipulated should regularly detect the insulation resistance of insulator chain porcelain vase.In time detecting and change the low null value porcelain vase in the insulator chain, is a kind of effective anti-accident measures to the safe operation that guarantees electric system.So the detection of low null value porcelain vase has great economic and social benefit.
Current be with voltage distribute measuring staff, measure the insulator chain magnitude of voltage that each porcelain vase shares that is in operation, judge whether it is low null value porcelain vase.This needs operating personnel to climb to line of electric force network shaft tower to get on, and lifts and sees that heavy measuring staff measures.Not only labour intensity is big, poor stability concerning operating personnel, and on measurement mechanism, exist shortcoming, and make tested insulator arc-over, form short circuit, so once caused taking place the line tripping accident because of surveying the null value porcelain vase.
Though the precedent of development such as home and abroad existing wireless power technology, infrared technology null value porcelain vase ground detection, technical sophistication, measurement accuracy are low, poor practicability, price are too high.
In addition, available insulation megger is measured the insulating resistance value of power equipment such as porcelain vase under power-off condition.But the existing logolmeter type insulation megger volume that generally uses is bigger, and weight is heavier, can not measure the insulation resistance of porcelain vase in the high vacancy of insulator of electric power line pole tower suspension.Megger is placed on the ground if will insulate, and then needs two ten to tens meters measuring lead wire, and must operate in double harness, and is very inconvenient, so generally all do not adopt this method.
The purpose of this utility model is when the power circuit of the clear wiping of power failure regularly porcelain vase, finishes the accurate testing of the low null value porcelain vase of insulator chain in passing.To requirement of the present utility model be: self-powered; Volume is little, and is in light weight, can be contained in the pocket to carry; Can hold this measuring instrument on the other hand when measuring porcelain insulator resistance, operate on the other hand, be applicable to that operating personnel stand, are sitting in the power line lead supernatant and wipe the forward and backward measurement of carrying out porcelain insulator resistance of porcelain vase.
Use the utility model has the advantages that: measurement result is accurate, easy and simple to handle, more safely, saved and aimed at a large amount of human and material resources of measuring low zero porcelain vase in the insulator chain and spending; Prevent the line outage accident that the existence because of low null value porcelain vase causes, so have very big economic and social benefit.
The way that realizes the utility model task is: utilize volt---the ultimate principle of peace method measuring resistance, do power supply with dry cell, the light insulation measurement instrument that adopts advanced electronic technology and electronic devices and components to form; Include: the current unit ［ 1 ］ that dry cell is formed; Oscillating unit ［ 2 ］; Power amplification unit ［ 3 ］; AC boosting unit ［ 4 ］; Rectification boosting unit ［ 5 ］; Calibration, measurement switch unit ［ 6 ］; Measured value sample unit ［ 7 ］; The value of reading indicating member ［ 8 ］.
Form 6V power supply unit ［ 1 ］ by 4 joint dry cells (B) and supply with oscillating unit ［ 2 ］, the working power of the operational amplifier in the power amplification unit ［ 3 ］.Oscillating unit ［ 2 ］ is made of operational amplifier and RC connection in series-parallel oscillator, and the sine wave signal of output 15KHZ is via power amplification unit ［ 3 ］ the maximum output current 0.25A of operational amplifier and impedance-matching transformer (T) formation; AC boosting unit ［ 4 ］ output voltage 120～140V; Rectification boosting unit ［ 5 ］ output voltage 2500V, show 2500V by calibration switch unit ［ 6 ］ by display unit ［ 8 ］, when if output voltage is not 2500V, it is 2500V that the pressure regulation potentiometer in the adjusting boosting unit ［ 4 ］ makes the output voltage of rectification boosting unit ［ 5 ］; Behind the voltage calibration, calibration measurement switch unit ［ 6 ］ is applied on the tested porcelain vase 2500V, through the current signal of measured value sampling unit ［ 7 ］ acquisition stream, indicate the insulation resistance megaohm value of tested porcelain vase by the pointer microampere meter of the value of reading indicating member ［ 8 ］ through tested porcelain vase.
Below in conjunction with accompanying drawing the utility model is described further:
Fig. 1, the low null value porcelain vase detector theory diagram of insulator chain;
Fig. 2, the low null value porcelain vase detector principle assumption diagram of insulator chain;
Fig. 3, the low null value porcelain vase detector case panel synoptic diagram of insulator chain.
See that the power supply unit ［ 1 ］ that the low null value porcelain vase detector of insulator chain illustrated in figures 1 and 2 is made up of 4 joint dry cells is supplied with oscillating unit ［ 2 ］, the middle operational amplifier of power amplification unit ［ 3 ］ (is respectively U
1, U
2) power supply.
Oscillating unit ［ 2 ］ is by operational amplifier U
1(LM324) and RC connection in series-parallel frequency selection network (R wherein
1=R
2Be 480 Ω, R
3Be 30K Ω, R
4It is 0～20K Ω adjustable resistance; C
1=C
2Be 0.022 μ F/63V) constitute.The sine wave signal of oscillating unit output 15KHZ is sent into power amplification unit ［ 3 ］; By adjustable potentiometer W
1Resistance 0～10K Ω), operational amplifier U
2(LM386N) and R
5, C
3, C
4Constitute power amplification unit ［ 3 ］, wherein: (R
5Be 10 Ω, electrochemical capacitor C
3Be 100 μ F/16V, capacitor C
4Be 0.05 μ F/63V).Through C
3Output
The AC boosting unit ［ 4 ］ that the power warp let-off is made of the transformer of FERRITE CORE, the turn ratio of transformer are 25/650～780, the high-pressure side has 3 taps, and power is 1.5W.Step-up transformer output 120～140V, 15KHZ exchange via capacitor C
5, C
6With silicon stack D and protective resistance R
6The 9 grades of tandem rectification boosting units ［ 5 ］ that constitute, wherein: (C
5Be 0.033 μ F/400V, C
6Be that 0.011 μ F/400V, D are 1000V/0.01A, R
6Be 10K Ω), output voltage is-2500V.By a single-pole double throw switch K
2Constitute calibration, measuring unit ［ 6 ］ is as disconnecting link K
2When investing calibrating position 1,, 2500V is put on current-limiting resistance R without external circuit
7And resistance R
8Go up (R
7Be 9.78M Ω, R
8Be 1.1M Ω), range shift switch K
3Make shunt resistance R
9Be connected in parallel on resistance R
8On, making the electric current by indicating member ［ 8 ］ microampere meter is 50 μ A, the indication full scale, and indicated value is represented 2500V, if indication is not a full scale, the potentiometer W of unit ［ 3 ］ is put in Power Regulation
1, change the output of power amplifier big unit ［ 3 ］, make AC boosting unit ［ 5 ］ be output as this calibration of promptly showing of 2500V().By two exsertile rubber-like measuring lead wire, range shift switch K
3With current-limiting resistance R
7, R
8And shunt resistance R
9(resistance is 275K Ω) constitutes measured value sample unit ［ 7 ］.Work as K switch
2When investing measuring position 2,2500V voltage puts on measured resistance R
XAnd the current-limiting resistance R of series connection with it
7, R
8With shunt resistance R
9On, pass through R
XElectric current (through shunt resistance R
9Shunting) a part is by microampere meter indication measured resistance value.By a full scale is that the pointer direct current microampere dress (G) of 50 μ A and microampere meter overcurrent protective device are (with resistance R
8Neon argon gas body glow tube (P) NHO-13 in parallel) constitutes the value of reading indicating member ［ 8 ］; On the microampere dial plate 3 scale marks are arranged: one is 0～2500V voltage calibration; One for useful range 0～40M Ω, another is 40～1000M Ω (range shift switch K
3Correspondence 40～1000M Ω scale value when investing high resistant).Remove the current-limiting resistance R in the rectification boosting unit ［ 5 ］ in the utility model
6Outside 1W, the power of all the other resistance is 0.125W.
Fig. 3 is the low null value porcelain vase detector case panel synoptic diagram of insulator chain, and shell dimension of the present utility model is: long 140mm, wide 55mm, thick 40mm.Adopt aluminium alloy plate or make shell, the panel aluminium alloy plate with rigid plastic.Each numeral on the panel is represented respectively: 1 pointer instrument; 2 power switch K
13 calibrations, measurement change-over switch K
24 range shift switch K
35 are overcurrent demonstration neon discharge tube window; 6 magnitude of voltage adjusting knobs; The outlet of 7 measuring lead wire.Pointer microampere meter in the value of the reading indicating member of the present utility model ［ 8 ］ can replace with 3 1/2 bit digital voltage tables; And be equipped with single-chip microcomputer the sensitivity of insulation measurement and accuracy are further improved, and has a memory function, when one day testing is finished, can print the testing result of low null value porcelain vase by mini-printer, develop into the series of products that insulation measurement is used.
Claims (8)
1, a kind of High-Voltage Technology field that relates to, circuit porcelain insulator resistance measuring instrument when being mainly used in the high-voltage electric power circuit power failure, include: housing, battery are power supply unit [1] and the value of reading indicating member [8], it is characterized in that battery power unit [1] is connected with oscillating unit [2], power amplification unit [3], AC boosting unit [4], direct current tandem rectification unit [5] and the value of reading indicating member [8].
2, porcelain insulator resistance measuring instrument according to claim 1 is characterized in that the oscillating unit ［ 2 ］ that operational amplifier and RC frequency selection circuit constitute, and the direct current that battery power unit ［ 1 ］ is supplied with is exported the sine wave signal of 12～18KHZ through vibrating.
3, porcelain insulator resistance measuring instrument according to claim 1, it is characterized in that the power amplification unit ［ 3 ］ and AC boosting unit ［ 4 ］ that constitute by operational amplifier and ac step-up transformer, the sine wave signal that oscillating unit ［ 2 ］ is supplied with after power amplification and AC boosting, output 140～220V alternating voltage, power be 0.5～2W.
4, porcelain insulator resistance measuring instrument according to claim 1, it is characterized in that 5～12 grades of tandem rectification boosting units ［ 5 ］ that the alternating voltage by AC boosting unit ［ 4 ］ output constitutes through semiconductor rectifier cell and electric capacity, and the tap by changing AC boosting unit ［ 4 ］ transformer high-voltage winding and regulate potentiometer (W1) that power amplification unit ［ 3 ］ input connect, during the switch trend of purchasing calibrating position that makes calibration, measuring unit ［ 6 ］, by the value of reading indicating member ［ 8 ］ indication 2500V, the specifying measurement voltage during as measurement insulation resistance.
5, porcelain insulator resistance measuring instrument according to claim 1 is characterized in that, by two exsertile rubber-like measuring lead wire, range shift switch K
3With current-limiting resistance R
7, R
8And shunt resistance R
9Constitute measured value sampling unit ［ 7 ］, as the single-pole double throw toggle switch K of calibration, measuring unit ［ 6 ］
2When investing the measuring position, the 2500V voltage of being exported by rectification boosting unit ［ 5 ］ puts on measured resistance R
XAnd current-limiting resistance R
7, R
8, shunting R
9, flow through R
XElectric current through resistance R
9After the shunting, by the following measured resistance value of the value of reading indicating member ［ 8 ］ indication 40M Ω.
6, porcelain insulator resistance measuring instrument according to claim 1 is characterized in that when measured resistance value during greater than 40M Ω, by range shift switch K
3Cut off and resistance R
8Shunt resistance R in parallel
9, expand useful range to 1000M Ω～2000M Ω.
7, porcelain insulator insulation measurement instrument according to claim 1; it is characterized in that by a full scale being that pointer direct current microampere meter and the neon argon gas body glow tube of 20～100 μ A formed the microampere meter overcurrent protective device; formation has 0～2500V voltage calibration line and useful range is the value of the reading indicating member ［ 8 ］ of 0～40M Ω and two resistance scales of 40～2000M Ω, if by measured resistance R
XElectric current without resistance R
9Shunting, and when surpassing the full scale electric current of the value of reading indicating member ［ 8 ］ microampere meter, this electric current is in resistance R
8On pressure drop be higher than the sparking voltage of neon argon gas body glow tube, then this tube discharge with the microampere meter short circuit, is protected microampere meter.
8, insulator porcelain vase insulation measurement instrument according to claim 1, it is characterized in that the value of reading indicating member ［ 8 ］ can further improve, adopt single-chip microcomputer and digital voltmeter to constitute, not only can enlarge resistance measurement useful range, make measure sensitivity, accuracy improves, and the measured value that shows can be remembered, when one day testing finishes, can be equipped with mini-printer and print testing result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93224548 CN2170529Y (en) | 1993-09-20 | 1993-09-20 | Isolator string low-zero magnetic bottle detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93224548 CN2170529Y (en) | 1993-09-20 | 1993-09-20 | Isolator string low-zero magnetic bottle detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2170529Y true CN2170529Y (en) | 1994-06-29 |
Family
ID=33802541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93224548 Expired - Fee Related CN2170529Y (en) | 1993-09-20 | 1993-09-20 | Isolator string low-zero magnetic bottle detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2170529Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301417A (en) * | 2015-12-01 | 2016-02-03 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Assessment method for insulating property of mossed and moldy composite insulator for converter station/transformer station |
-
1993
- 1993-09-20 CN CN 93224548 patent/CN2170529Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301417A (en) * | 2015-12-01 | 2016-02-03 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Assessment method for insulating property of mossed and moldy composite insulator for converter station/transformer station |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |