CN2066589U - Tester for operaitng wave of distribution transformer - Google Patents
Tester for operaitng wave of distribution transformer Download PDFInfo
- Publication number
- CN2066589U CN2066589U CN 90205253 CN90205253U CN2066589U CN 2066589 U CN2066589 U CN 2066589U CN 90205253 CN90205253 CN 90205253 CN 90205253 U CN90205253 U CN 90205253U CN 2066589 U CN2066589 U CN 2066589U
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- voltage
- transformer
- wave
- circuit
- output terminal
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Abstract
The utility model relates to a tester for operating wave of distribution transformer that changes DC voltage into AC rectangular voltage by utilizing self-oscillation and charges the main capacitance after the voltage is amplified, doubled and rectified. When the non-contact switch is conducted by triggering, the electronic charge on the capacitor discharges toward the capacitors and inducers on the pulse modulation transformer winding. Through electromagnetic coupling, the operating wave test voltage is generated as required on the secondary winding to be applied onto the wave test distribution transformer, and an injury indicating meter of frequency breadth is used to identify the existence of turns and the defects of interlaminar insulation and main insulation. The tester for operaitng wave of distribution transformer has the advantages of small size, light in weight, and convenient carrying, and is fit for field test. The utility model is composed of a casing, an inverter, and a voltage doubling rectifying circuit.
Description
The utility model relates to a kind of detecting instrument, especially for the instrumentation that detects transformer circle, layer insulation and major insulation defective.
Once adopted the extra pulse exerciser that transformer is carried out Insulation Test in the past, and observe waveform by oscillograph and judge insulation defect.Its deficiency is: output waveform is non-standard, and sensitivity is lower; The test apparatus volume is big, carries inconvenience, operates more loaded down with trivial details; Need to use AC power, the testing ground is difficult for solving, and is not suitable for site test.
If adopt industrial frequency withstand voltage, can only detect its major insulation defective, circle, layer insulation then detect to come out, and function ratio is more single.And also need AC power, be not suitable for site test.
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, provides a kind of and can detect transformer circle, layer insulation and major insulation defective, and be output as the switching surge test device of reference waveform.
The purpose of this utility model is achieved in that utilizes self-sustained oscillation that DC voltage is reverse into ac square-wave voltage, behind pressure regulation, power amplification, voltage multiplying rectifier, charge to storage capacitor, after noncontacting switch is triggered conducting, electric charge on the electric capacity is just to the electric capacity of pulsed modulation Transformer Winding, inductive discharge and produce vibration, produce necessary operations ripple trial voltage through electromagnetic coupled at secondary winding, and be applied on the tested transformer, show by the frequency width of cloth that the wound table is indicated and judge that tested transformer has or not the defective of circle, layer and major insulation.
Substation transformer switching surge test device comprises casing, inverter, voltage doubling rectifing circuit, the output terminal that its special character is to be output as the inverter of adjustable square wave alternating-current voltage is connected with voltage doubling rectifing circuit, the output terminal of voltage doubling rectifing circuit is connected by adjustable impulse voltage generator, pulsed modulation transformer and decides the input end of the operation wave voltage generator that pulse trigger forms, the output terminal of operation wave voltage generator is connected with the elementary winding of a, tested transformer, and Secondary winding of transformer is connected with three ball pressure measurement protection gap; The input end of b, resitstance voltage divider links to each other, and the output terminal of resitstance voltage divider is connected to frequently the width of cloth and shows and hinder watch circuit.
Because the good transformer of insulation is that wave rear amplitude partly has obvious variation with the waveform that transformer reacted that insulation of circle layer and major insulation defective are arranged, therefore above-mentioned resitstance voltage divider and frequently the width of cloth show to hinder and be provided with delay circuit between the watch circuit, in order to avoid the wave head part, wave rear is partly detected, can improve the accuracy of judgement.
According to the needs of different capabilities, on resitstance voltage divider, be provided with intrinsic standoff ratio change-over switch SK
1-C, and with adjustable square wave alternating-current voltage inverter and adjustable impulse voltage generator on change-over switch SK
1--a, SK
1--b is a coaxswitch, to satisfy the requirement of various different capabilities, improves the sensitivity of instrument.
The utility model compared with prior art has following characteristics:
1. this instrument volume is little, in light weight, easy to carry, is adapted at the substation transformer site test.
2. adopt 12 volts of battery pas power sources, be specially adapted to lack after the substation transformer platform has a power failure under the situation of AC power substation transformer is carried out execute-in-place by withstand voltage test.
3. this instrument does not need peripheral hardware pressure build-up test transformer, and utilizes the autonomous induction of tested transformer to reach test objective.
4. this apparatus structure is simple, easy to operate, can detect in the motion effectively, after the overhaul or the substation transformer of new product is not good because of manufacturing process, maintenance is improper, natural deterioration and superpotential attack, and between the circle and circle of winding, layer with layer between, and between the winding and the insulation defect of the residual that causes between over the ground of winding.Show wound table analysis and judgement intuitively by the frequency width of cloth, show that wound is highly sensitive.
The drawing explanation of accompanying drawing:
Fig. 1 is a block scheme of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Fig. 3 is the oscillogram of switching surge test.
Fig. 4 is an external structure synoptic diagram of the present utility model.
Fig. 5 is the utility model and tested transformer connection synoptic diagram.
Be described in further detail below in conjunction with accompanying drawing:
As shown in Figure 1, the utility model mainly by inverter (1), voltage doubling rectifing circuit (2), adjustable impulse voltage generator (3), pulsed modulation transformer (4), decide pulse trigger (5), resitstance voltage divider (8), delay circuit (9), the width of cloth shows that hindering watch circuit (10) forms frequently.Tested transformer (6), three ball pressure measurement protection gap (7).
As Fig. 2, inverter is made up of square-wave oscillator, power amplification circuit.Square-wave oscillator comprises integrated circuit, divider resistance R
1, R
2, capacitor C
1And adjustable resistance DW
1Power amplification circuit is made up of class A amplifier and class B push-pull power amplifier.Class A power amplifier goes to promote the power amplification of class B push-pull as promoting level after the square wave alternating-current voltage amplification with oscillator output, also play buffer stage simultaneously.Between square-wave oscillator and amplifying circuit, be provided with change-over switch SK
1--a.Power amplification circuit is to be made of following parts: triode BG
3, BG
4, BG
5, resistance R
5, R
7, R
8, capacitor C
3, C
4, transformer BY
2, BG
3, diode D
1, D
2, because triode BG
4, BG
5Be connected on the elementary winding of output transformer, and transformer is an energy-storage travelling wave tube, under the steeper square-wave voltage effect of wave head, wave rear, easily produces higher instantaneous overvoltage, can make triode take place to puncture and damage, therefore adopt more powerful diode D
1, D
2And resistance R
8, capacitor C
4Deng holding circuit, to absorb instantaneous superpotential as triode.
Voltage doubling rectifing circuit is by diode D
3, D
4, capacitor C
5, C
6And resistance R
9Form.Its input end is connected with the output terminal of power amplifier, and output terminal then links to each other with the input end of adjustable impulse voltage generator.Because the power supply after amplifying is to exchange, through obtaining being to the maximum 450 volts DC voltage behind the twice repoussage stream.
Operation wave voltage generator is by adjustable impulse voltage generator, pulsed modulation transformer and decide pulse trigger and form.Adjustable impulse voltage generator comprises energy-storage capacitor C
7, C
8, C
9And current-limiting resistance R
10, controllable silicon SCR.On three energy-storage capacitors, be provided with Capacity Selection switch S K
1--b, to adapt to the needs of different capabilities.Pulsed modulation transformer BY
4In order to improve output voltage, also solved the not enough and steeper problem of tested transformer low voltage winding wave head of controllable silicon reverse cut-off peak voltage simultaneously.Deciding pulse trigger is a relaxation oscillator, is used for determining that per second applies the number of times of switching surge test voltage.Present embodiment adopts the per second triggering and conducting five times.It is by resistance R
11, R
12, voltage stabilizing diode WY
1Adjustable resistance DW
6, storage capacitor C
10, double base diode VJT and diode D
10And pulse isolation transformer BYs constitutes.Adjust resistance DW
6, make its speed produce pulse and go to trigger controllable silicon SCR with per second five times, make controllable silicon per second conducting five times, reach the purpose that per second produces five operation wave voltages.The output terminal of pulsed modulation transformer links to each other with the secondary low-voltage winding of tested transformer, and its high pressure winding is connected with three ball side pressures protection gap, as shown in Figure 5.When doing switching surge test, because the waveform of tested transformer high-low pressure winding is the amplitude difference, and the variation of waveform is identical, so can measure at the low pressure winding, but because of its voltage still is more than several kilovolts, be higher than the input voltage that the frequency width of cloth shows the wound table far away, the output terminal at the pulsed modulation transformer is connected with by resistance R for this reason
13, R
16, R
17The resitstance voltage divider that is constituted.Being defeated by frequently the width of cloth behind resitstance voltage divider shows and hinders watch circuit.It mainly is to prevent that producing the surface because of voltage is high climbs sudden strain of a muscle that voltage divider adopts several resistance series connection, works and increase creep distance, keeps the effect of instrument service-strong.On voltage divider, be provided with intrinsic standoff ratio change-over switch SK
1--C, intrinsic standoff ratio change-over switch and aforementioned two kinds of change-over switch SK
1--a, SK
1--b is a coaxswitch.
The insulation of tested transformer good or bad mainly be that the amplitude that is reflected at the wave rear part has significant change, as shown in Figure 3, a is the good waveform of insulation, and b is the waveform that circle layer insulation defect arranged, and just can show that transformer has or not insulation defect as long as measure the amplitude of wave rear part.Therefore show to hinder between the watch circuit with the frequency width of cloth at the output terminal of voltage divider and be connected with by resistance R
17And capacitor C
11The delay circuit of forming in order to avoid the wave head part, is only measured the amplitude of wave rear part.
Frequently the width of cloth shows that hindering watch circuit is Polarity Control diode D
5, storage capacitor C
12, overvoltage protection diode D
6-D
9And the operational amplifier formation, its output is connected the frequency width of cloth and shows on the wound table.
As shown in Figure 4, being respectively equipped with frequently on the front panel of casing (11), the width of cloth shows wound table FP(12), supply voltage indicating gauge (13), power switch (14), accessory power outlet (15), zeroing knob DW
3(16), Capacity Selection switch S K
1(17), separate selector switch SK
2(18), adjusting pressuring knob DW
1(19), circuit board then is arranged in the casing.
In conjunction with the three-phase four-wire system substation transformer, the operation of the present utility model and the course of work are illustrated the low pressure winding a of tested transformer, b, c, by separate selector switch SK
2Be connected with the output terminal of operation wave voltage generator.As shown in Figure 5, high pressure winding A, B, C then are connected with three ball pressure measurement protection gap mutually.When separate selector switch was connected bo, the induced voltage of high pressure B phase winding simultaneously should be with high pressure A, C two phase ground for the highest, and tested is B/AC ground mutually, can detect B, b phase winding circle layer insulation defective and major insulation defective.When co pressurizeed, A, B held ground connection mutually equally, and ao when pressurization B, C hold ground connection mutually, and will measure major insulation and the circle layer insulation that B phase, C reach the A phase mutually respectively has zero defect.The course of work of its instrument is: connect direct supply, inverter becomes direct current into the square wave alternating-current signal source of adjustable voltage, and through power amplification, voltage multiplying rectifier is to adjustable impulse voltage generator, and by current-limiting resistance R
10Storage capacitor C in generator
7, C
8, C
9Charging makes its store charge.Adjust the adjustable resistance DW that decides pulse trigger
6Produce five subpulse voltages to reach per second, remove to trigger the controllable silicon in the impulse voltage generator, when controllable silicon is triggered conducting, the electric charge of storage capacitor is discharged on the pulsed modulation primary winding, on secondary winding, induce operation wave voltage through electromagnetic coupled up to thousands of volts, and go up mutually by the elementary low pressure winding b that separate selector switch is applied to tested distribution power transformation device, secondary high pressure winding B goes up the also corresponding operation wave voltage that induces regulation mutually, as tested transformer insulated good, then the waveform at high-low pressure winding two ends is basic identical, and its wave rear attenuation ratio is slower.When having circle, layer insulation defective or major insulation defective as ripple examination transformer, under its induced voltage effect, when producing the partial breakdown discharge, because energy consumption is big, frequency of fadings increases amplitude and descends, sudden change appears in waveform, thereby the very fast decay of wave rear, and the width of cloth shows that the wound table then shows very sensitively and looks out frequently.
Claims (3)
1, a kind of substation transformer switching surge test device, comprise casing (11), inverter (1), voltage doubling rectifing circuit (2), the output terminal that it is characterized in that being output as the inverter of adjustable square wave alternating-current voltage is connected with voltage doubling rectifing circuit, the output terminal of voltage doubling rectifing circuit is connected by adjustable impulse voltage generator (3), pulsed modulation transformer (4) reaches the input end of the operation wave voltage generator of deciding pulse trigger (5) composition, the output terminal of operation wave voltage generator is connected with the elementary winding of the tested transformer of a (6), and Secondary winding of transformer is connected with three ball side pressures protection gap (7); The input end of b resitstance voltage divider (8) links to each other, and the output terminal of resitstance voltage divider is connected with frequently the width of cloth and shows and hinder watch circuit (10).
2, substation transformer switching surge test device according to claim 1, it is characterized in that resitstance voltage divider and frequently the width of cloth show to hinder and be provided with delay circuit (9) between the watch circuit.
3, according to claim 1,2 described substation transformer switching surge test devices, it is characterized in that on resitstance voltage divider, being provided with intrinsic standoff ratio change-over switch SK
1--C, and with adjustable square wave alternating-current voltage inverter and adjustable impulse voltage generator on change-over switch SK
1--a, SK
1--b is a coaxswitch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90205253 CN2066589U (en) | 1990-04-21 | 1990-04-21 | Tester for operaitng wave of distribution transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90205253 CN2066589U (en) | 1990-04-21 | 1990-04-21 | Tester for operaitng wave of distribution transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2066589U true CN2066589U (en) | 1990-11-28 |
Family
ID=4886058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90205253 Expired - Lifetime CN2066589U (en) | 1990-04-21 | 1990-04-21 | Tester for operaitng wave of distribution transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2066589U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926435A (en) * | 2014-05-07 | 2014-07-16 | 苏州工业园区海沃科技有限公司 | Power source for detecting transformer operation waves and inducting withstand voltage partial discharge |
| CN113823176A (en) * | 2021-09-27 | 2021-12-21 | 万林 | Star elephant three-globe instrument |
-
1990
- 1990-04-21 CN CN 90205253 patent/CN2066589U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926435A (en) * | 2014-05-07 | 2014-07-16 | 苏州工业园区海沃科技有限公司 | Power source for detecting transformer operation waves and inducting withstand voltage partial discharge |
| CN113823176A (en) * | 2021-09-27 | 2021-12-21 | 万林 | Star elephant three-globe instrument |
| CN113823176B (en) * | 2021-09-27 | 2023-08-08 | 万林 | Star image three-ball instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| RN01 | Renewal of patent term | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |