CN101846722A - Chopped wave lightning impulse test device and method of transformer - Google Patents
Chopped wave lightning impulse test device and method of transformer Download PDFInfo
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- CN101846722A CN101846722A CN200910010859A CN200910010859A CN101846722A CN 101846722 A CN101846722 A CN 101846722A CN 200910010859 A CN200910010859 A CN 200910010859A CN 200910010859 A CN200910010859 A CN 200910010859A CN 101846722 A CN101846722 A CN 101846722A
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Abstract
The invention relates to a chopped wave lightning impulse test device and a method of a transformer; the device comprises a capacitive voltage divider and a delay cable, wherein the input end of the capacitive voltage divider is connected with the first stage output end of an impulse voltage generator and sends a high-voltage pulse signal after voltage division to the delay cable; one end of the delay cable is connected with the high-voltage pulse signal output end of the capacitive voltage divider, and the other end thereof is connected with the first stage ball of a cut-off device; the method comprises the following steps that: the high-voltage pulse signal is obtained from the first stage output end of the impulse voltage generator; the capacitive voltage divider divides the voltage of the high-voltage impulse signal; the length of the delay cable is selected on the demand of a test, and the high-voltage impulse signal after voltage division is delayed; once of 50 to 75 percent of high voltage is applied; and continuous twice of 100 percent of high voltage is applied. The invention can ensure that the lightning impulse chopping is more reliable and a test sample is not damaged because of too high testing voltage, and can be applied to more test samples, such as a reactor, a sleeve and the like.
Description
Technical field
The present invention relates to the transformer performance measuring technology, a kind of specifically transformer chopped lightning impulse test method.
Background technology
It is one of important indicator of estimating transformer performance that the anti lightning of transformer cuts the wave impact ability.For the anti lightning of testing transformer cuts the wave impact ability, cut the generation of ripple and generally adopt resitstance voltage divider to gather high-voltage pulse signal from impact device, through several meters high-tension cables, trigger cutting device by the time-delay case.Though this method is blocked reliably, time to chopping can not be regulated arbitrarily, and uses inconvenience, as: whether all need measure the time-delay case before each test intact; Test at the power transformer product of different electric pressures needs, and changes wiring, with the length of regulating delay time etc.The capability and performance of time-delay case also can't satisfy repeatedly test request, often damages the time-delay case.Along with the develop rapidly of electronic technology, above-mentioned traditional method for cutting is cancelled gradually, more adopt multistage intercept unit, replace the time-delay case by the electronic delay device.But, when practical application, find, when carrying out the test of extra-high voltage (for example 1000kV) power transformer product, because electronic delay device poor anti jamming capability, may cause being failure to actuate in the time of indivedual or misoperation and can not reliably blocking, will cause test product to bear too high trial voltage.For this reason, need research reliable test unit of time-delay and test method, guarantee when the extra-high voltage product testing, can reliably block.And these type of apparatus and method are not appeared in the newspapers as yet in the art.
Summary of the invention
At above shortcomings part in the prior art, the technical problem to be solved in the present invention provides a kind of transformer chopped wave lightning impulse test device and the method that can reliably block.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of transformer chopped wave lightning impulse test device of the present invention comprises: capacitive divider and time-delay cable, wherein: capacitive divider, input end links to each other with the first order output terminal of impulse voltage generator, will deliver to the time-delay cable through the high-voltage pulse signal after the dividing potential drop; The time-delay cable, an end links to each other with the high-voltage pulse signal output terminal of capacitive divider, and the other end is connected to the first order ball of cutting device.
Described capacitive divider adopts two groups of capacitances in series to connect, and wherein the appearance value of first electric capacity is a fixed value, and second capacitor's capacity is adjustable; The dielectric level of described capacitive divider is: high-voltage arm 〉=200kV, low-voltage arm 〉=20kV; Described time-delay cable adopts the multistage cable segmentation structure that is connected in series; Dielectric level 〉=the 35kV of described time-delay cable.
A kind of transformer chopped lightning impulse test of the present invention method may further comprise the steps:
Get high-voltage pulse signal from the first order output terminal of impulse voltage generator; By capacitive divider above-mentioned high-voltage pulse signal is carried out dividing potential drop; Choose the time-delay cable length according to the test needs, the high-voltage pulse signal after the dividing potential drop is carried out delay process; Apply 50～75% high voltages once; Apply 100% high voltage secondary continuously.
The preparation of described capacitive divider is by adjusting the appearance value X of second electric capacity
C2Change intrinsic standoff ratio (X
C1+ X
C2)/X
C2, and have: 7≤(X
C1+ X
C2)/X
C2≤ 15; X wherein
C1It is the appearance value of first electric capacity (C1).
Described time-delay cable adopts the multistage cable segmentation structure that is connected in series, and the determining of its length may further comprise the steps:
Determine with per 200 meters time-delay 1 μ S according to the required delay time of test transformer;
Display delayed time data by the shock measurement device when applying low pressure is done further accurately adjusting to the time-delay cable length of determining through above-mentioned steps, to satisfy national testing standard.
The dielectric level of described capacitive divider is: high-voltage arm 〉=200kV, low-voltage arm 〉=20kV.
Dielectric level 〉=the 35kV of described time-delay cable.
The present invention has following beneficial effect and advantage:
1. apparatus of the present invention and method can guarantee that chopped lightning impulse is more reliable, can not cause being failure to actuate or misoperation and can not reliably blocking, and also can not make test product bear too high trial voltage and damage.
2. apparatus of the present invention and method can be applicable in the more test product, as reactor, sleeve pipe etc.
Description of drawings
Fig. 1 is apparatus of the present invention electrical schematic diagram.
Embodiment
Embodiment 1
As shown in Figure 1, empty frame institute restricted portion is apparatus of the present invention.Transformer chopped wave lightning impulse test device of the present invention comprises: capacitive divider and time-delay cable, wherein: the capacitive divider input end links to each other with the first order output terminal I1 of impulse voltage generator, will deliver to the time-delay cable through the high-voltage pulse signal behind the capacitance partial pressure; One end of time-delay cable links to each other with the high-voltage pulse signal output terminal of capacitive divider, and the other end is connected to the first order ball G1 of cutting device.
Described capacitive divider adopts two groups of capacitances in series to connect, and wherein the appearance value of first capacitor C 1 is a fixed value, and second capacitor C, 2 appearances value is adjustable.The dielectric level of capacitive divider is: high-voltage arm 〉=200kV, low-voltage arm 〉=20kV.The time-delay cable adopts the multistage cable segmentation structure that is connected in series, its dielectric level 〉=35kV.
Transformer chopped lightning impulse test method of the present invention may further comprise the steps:
Get high-voltage pulse signal from the first order output terminal of impulse voltage generator;
By capacitive divider above-mentioned high-voltage pulse signal is carried out dividing potential drop;
Choose the time-delay cable length according to the test needs, the high-voltage pulse signal after the dividing potential drop is carried out delay process;
Apply 50～75% high voltages once;
Apply 100% high voltage secondary continuously.
The preparation of described capacitive divider is by adjusting the appearance value X of second electric capacity (C2)
C2Change intrinsic standoff ratio (X
C1+ X
C2)/X
C2, and have:
7≤(X
C1+X
C2)/X
C2≤15；
X wherein
C1It is the appearance value of first electric capacity (C1).
Described time-delay cable adopts the multistage cable segmentation structure that is connected in series, and definite method of its length is as follows:
Determine with per 200 meters about 1 μ S of time-delay according to the required delay time of test transformer;
Display delayed time data by the shock measurement device when applying low-voltage (50～75% voltage) is done further accurately adjusting to the time-delay cable length of determining through above-mentioned steps, to satisfy national standard.
Present embodiment is that the SFP-750000/500 power transformer is that example is carried out chopped lightning impulse test with a model, and is specific as follows:
(1) choosing and the preparation of capacitive divider of high-voltage pulse signal:
The output voltage of the impulse voltage generator that uses in the present embodiment is 0～4800kV, and 1～24 grade is adjustable. show that through experimental study the cutting device that the present invention uses must be from the first order output I1 number of winning the confidence of impulse voltage generator.Through capacitive divider secondary output 10～15kV pulse voltage signal.Test draws the relation such as the table 1 of secondary output voltage of charging voltage, the capacitive divider of impulse voltage generator first order output voltage and impulse voltage generator:
Table 1
By adjusting the appearance value X of second capacitor C 2
C2Change intrinsic standoff ratio (X
C1+ X
C2)/X
C2, in the present embodiment, second capacitor C 2 is composed in parallel by a plurality of electric capacity, adjusts the appearance value X that shunt capacitance quantity can change second capacitor C 2
C2The dielectric level of capacitive divider is: high-voltage arm 〉=200KV, low-voltage arm 〉=20kV.
(2) choosing of time-delay cable:
Select the coaxial high-tension cable of single core of SYV-75-7-2 type for use, dielectric level 〉=35kV, the segmentation series connection is provided with, and 200 meters/section or 100 meters/section, 1000 meters of length overalls.In the present embodiment, time to chopping is 3 μ S, therefore needs 600 meters on time-delay cable, is connected in series between section and the section.
(3) apply low-voltage (being equivalent to 60% high voltage) once, the master gauge definite value of present embodiment high voltage appearance is 1675kV (1672kV is the actual magnitude of voltage that applies in the table 2);
When applying low pressure, can further regulate the time-delay cable length by the demonstration of impulse measuring systems, make the delay time of this length correspondence satisfy national Specification and get final product.
(4) apply high pressure twice continuously, finish chopped lightning impulse test;
The course of work of apparatus of the present invention is as follows:
I1 gets high-voltage signal from the output of the impulse voltage generator first order, utilize the suitable capacitive divider of preparation to get the high-voltage pulse signal of 10～15kV again, utilize the length adjustment delay time (about per 200 meters time-delay 1 μ S) of time-delay cable, directly trigger the first order ball G1 of cutting device (present embodiment adopts 3000KV, 15 grades of cutting devices), first order ball G1 at first punctures, other grades ball Continuous Breakdown (promptly puncturing synchronously) produces section ripple that wave rear is blocked.Owing to be that high-tension cable directly triggers cutting device, the dielectric level of cable is 35kV.Several kilovolts earth potential interference voltage does not influence whole cutting device system works like this.Apparatus of the present invention and method are through the simulation of beginning, and be all very reliable to the application of actual product, obtained success.As shown in table 2, for SFP-750000/500 power transformer high pressure (A phase) cuts ripple test findings data (result is identical mutually with C mutually for B):
Table 2
Wherein: the CW representative cuts ripple; U
FillEvery grade of charging voltage for impulse voltage generator; CG is the ball distance (adjustable) of cutting device; U is the voltage that puts on by on the trial product; T1 is the wave head time that applies voltage waveform; Tc is the lightning impulse time to chopping; K0 was a zero coefficient.
Judge that by display waveform this product satisfies the performance requirement of national standard defined.
Embodiment 2
Be to select for use a model to be with the difference of embodiment 1: ZZDFPZ-250000/500 converter power transformer net side (1.1) is as test products.As shown in table 3, be section ripple test findings of this test products:
Table 3
Wherein: the CW representative cuts ripple; U
FillEvery grade of charging voltage for impulse voltage generator; CG is the ball distance (adjustable) of cutting device; U is the voltage that puts on by on the trial product; T1 is the wave head time that applies voltage waveform; Tc is the lightning impulse time to chopping; K0 was a zero coefficient.
Embodiment 3
Be to select for use ZZDFPZ-250000/500 converter power transformer valve side (2.1) as test products with the difference of embodiment 1.As shown in table 4, be section ripple test findings of this test products:
Table 4
Wherein: the CW representative cuts ripple; U
FillEvery grade of charging voltage for impulse voltage generator; CG is the ball distance (adjustable) of cutting device; U is the voltage that puts on by on the trial product; T1 is the wave head time that applies voltage waveform; Tc is the lightning impulse time to chopping; K0 was a zero coefficient.
Claims (10)
1. transformer chopped wave lightning impulse test device is characterized in that comprising: capacitive divider and time-delay cable, wherein:
Capacitive divider, input end links to each other with the first order output terminal (I1) of impulse voltage generator, will deliver to the time-delay cable through the high-voltage pulse signal after the dividing potential drop;
The time-delay cable, an end links to each other with the high-voltage pulse signal output terminal of capacitive divider, and the other end is connected to the first order ball (G1) of cutting device.
2. by the described transformer chopped wave lightning impulse test device of claim 1, it is characterized in that: described capacitive divider adopts two groups of capacitances in series to connect, and wherein the appearance value of first electric capacity (C1) is a fixed value, and second electric capacity (C2) appearance value is adjustable.
3. by the described transformer chopped wave lightning impulse test device of claim 1, it is characterized in that: the dielectric level of described capacitive divider is: high-voltage arm 〉=200kV, low-voltage arm 〉=20kV.
4. by the described transformer chopped wave lightning impulse test device of claim 1, it is characterized in that: described time-delay cable adopts the multistage cable segmentation structure that is connected in series.
5. by the described transformer chopped wave lightning impulse test device of claim 1, it is characterized in that: the dielectric level 〉=35kV of described time-delay cable.
6. transformer chopped lightning impulse test method is characterized in that may further comprise the steps:
Get high-voltage pulse signal from the first order output terminal of impulse voltage generator;
By capacitive divider above-mentioned high-voltage pulse signal is carried out dividing potential drop;
Choose the time-delay cable length according to the test needs, the high-voltage pulse signal after the dividing potential drop is carried out delay process;
Apply 50～75% high voltages once;
Apply 100% high voltage secondary continuously.
7. by the described transformer chopped lightning impulse test of claim 6 method, it is characterized in that: the preparation of described capacitive divider is by adjusting the appearance value X of second electric capacity (C2)
C2Change intrinsic standoff ratio (X
C1+ X
C2)/X
C2, and have: 7≤(X
C1+ X
C2)/X
C2≤ 15;
X wherein
C1It is the appearance value of first electric capacity (C1).
8. by the described transformer chopped lightning impulse test of claim 6 method, it is characterized in that: described time-delay cable adopts the multistage cable segmentation structure that is connected in series, and the determining of its length may further comprise the steps:
Determine with per 200 meters time-delay 1 μ S according to the required delay time of test transformer;
Display delayed time data by the shock measurement device when applying low pressure is done further accurately adjusting to the time-delay cable length of determining through above-mentioned steps, to satisfy national testing standard.
9. by the described transformer chopped lightning impulse test of claim 6 method, it is characterized in that: the dielectric level of described capacitive divider is: high-voltage arm 〉=200kV, low-voltage arm 〉=20kV.
10. by the described transformer chopped lightning impulse test of claim 6 method, it is characterized in that: the dielectric level 〉=35kV of described time-delay cable.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102419411A (en) * | 2011-09-08 | 2012-04-18 | 国网电力科学研究院 | Combined test device and method of two impulse voltage generators |
| CN108880512A (en) * | 2018-06-22 | 2018-11-23 | 西北核技术研究所 | A kind of high power Double exponential pulse pulsewidth continuously adjusts circuit and adjusting method |
| CN109165850A (en) * | 2018-08-27 | 2019-01-08 | 云南电网有限责任公司电力科学研究院 | A kind of the VFTO pilot system and method for evaluable electrical secondary system reliability |
-
2009
- 2009-03-25 CN CN200910010859XA patent/CN101846722B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102419411A (en) * | 2011-09-08 | 2012-04-18 | 国网电力科学研究院 | Combined test device and method of two impulse voltage generators |
| CN108880512A (en) * | 2018-06-22 | 2018-11-23 | 西北核技术研究所 | A kind of high power Double exponential pulse pulsewidth continuously adjusts circuit and adjusting method |
| CN109165850A (en) * | 2018-08-27 | 2019-01-08 | 云南电网有限责任公司电力科学研究院 | A kind of the VFTO pilot system and method for evaluable electrical secondary system reliability |
| CN109165850B (en) * | 2018-08-27 | 2022-04-05 | 云南电网有限责任公司电力科学研究院 | VFTO test system and method capable of evaluating reliability of secondary system |
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