CN208752168U - A kind of cable voltage pilot system of variable-frequency series-resonance - Google Patents
A kind of cable voltage pilot system of variable-frequency series-resonance Download PDFInfo
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- CN208752168U CN208752168U CN201821369877.8U CN201821369877U CN208752168U CN 208752168 U CN208752168 U CN 208752168U CN 201821369877 U CN201821369877 U CN 201821369877U CN 208752168 U CN208752168 U CN 208752168U
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- cable
- variable
- capacitive divider
- pressure side
- threephase
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- 238000005259 measurement Methods 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 238000009413 insulation Methods 0.000 claims description 22
- 239000012212 insulator Substances 0.000 claims description 19
- 229910052573 porcelain Inorganic materials 0.000 claims description 12
- 230000005284 excitation Effects 0.000 claims description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 3
- 239000005977 Ethylene Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 23
- 239000003990 capacitor Substances 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
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Abstract
The utility model relates to cable voltage test field more particularly to a kind of cable voltage pilot systems of variable-frequency series-resonance, including variable-frequency power sources, exciting transformer, reactor group, capacitive divider, compensating electric capacity, cable body and insulating separator；Variable-frequency power sources is connected to the primary side of exciting transformer and powers for it, and for compensating electric capacity with the in parallel of the capacitive divider and for capacitance compensation, the measurement end of capacitive divider output is linked back variable-frequency power sources by conducting wire with transmission measurement signal；The phase to be measured that threephase cable surveys pressure side is electrically connected to the high-pressure side of capacitive divider by conducting wire, and the shielded layer of threephase cable is electrically connected to the low-pressure side of capacitive divider by conducting wire and is grounded simultaneously；Compensating electric capacity is increased, so that control is compensated to capacitance size in circuit, to guarantee the normal use of system；It is isolated and is supported using items of the insulating separator to the threephase cable other end, is improved operational safety.
Description
Technical field
The utility model relates to the cable voltage tests of cable voltage test field more particularly to a kind of variable-frequency series-resonance
System.
Background technique
Cable series connection resonant experimental device is by the way of the frequency for adjusting power supply, so that reactor and subject capacitor are real
Existing resonance, obtains high-voltage large current on test item, is one kind of current high-voltage test new method and trend, at home
It has been widely used outside.The device is mainly made of variable-frequency power sources, driver transformer, reactor, capacitive divider.It adopts
The advantages of being tested with series resonance includes: that power supply capacity needed for reducing greatly reduces, and reduces the weight and volume of equipment, changes
The waveform of kind output voltage prevents big short circuit current burn fault point, is not in any restoring over-voltage etc.；Parallel resonance
Or testing transformer mode, when doing pressure test, breakdown current rises tens times immediately, and the two is compared, short circuit current and breakdown
Electric current differs hundreds times；So series resonance can effectively find insulation weak-point, and there is no big short circuit current burn failures
The suffering of point.
Existing cable voltage test is carrying out laboratory, since the capacitor in pilot system has relative constant comparison
Expensive and specification is just more constant when leaving the factory, and the capacitance of voltage-dividing capacitor can be because old in the long-term use
The factors such as change, temperature, humidity change.In addition, when carrying out cable voltage test in the prior art, it is another when End Test
End generally will do it hanging；But meeting is possible to when the overhead positions of the other end change or when adjacent mutually close to each other
The personal safety of pressure test result or testing crew is impacted.
Utility model content
To solve problems of the prior art, the purpose of the utility model is to provide a kind of electricity of variable-frequency series-resonance
Cable pressure test system, increases compensating electric capacity, to compensate control to capacitance size in circuit, thus guarantee capacitor and
Resonance can occur for reactor, to guarantee the normal use of system；In addition, using insulating separator to the threephase cable other end
Items be isolated and supported, not only prevent the cable of adjacent phase close to each other, cause the shadow of test result or personal safety
It rings, is improved operational safety.
The purpose of this utility model is achieved through the following technical solutions:
A kind of cable voltage pilot system of variable-frequency series-resonance, including variable-frequency power sources, exciting transformer, reactor group,
Capacitive divider, compensating electric capacity, cable body and insulating separator；Variable-frequency power sources is connected to the primary side of exciting transformer and is
Its power supply, reactor group and capacitive divider are connected on the secondary side of exciting transformer, compensating electric capacity and the capacitive divider
Parallel connection is simultaneously used for capacitance compensation, and the measurement end of capacitive divider output is linked back variable-frequency power sources by conducting wire with transmission measurement signal；
The phase to be measured that threephase cable surveys pressure side is electrically connected to the high-pressure side of capacitive divider by conducting wire, and the shielded layer of threephase cable passes through
Conducting wire is electrically connected to the low-pressure side of capacitive divider and is grounded simultaneously；Non- survey press bond positioned at the threephase cable other end insulate
Isolator, insulating separator include three insulation connection seats, and three insulation connection seats pass through the porcelain insulator of same size respectively
Connect triangular in shape, the non-three-phase for surveying pressure side of threephase cable passes through cable connecting terminals respectively and is fixedly attached to corresponding insulation company
On joint chair.
Further, insulation connection seat includes positioning seat, cover board and screw rod, the side setting of positioning seat is fluted, in groove
Portion is provided with positioning column, and cover board is closed at the groove notch of the positioning seat for covering and fixed by screw rod；It is arranged on the cover board
There is the blind hole corresponding to positioning seat；The non-any phase for surveying pressure side of threephase cable is by cable connecting terminals to being preferably attached to the groove
It is interior.
Further, porcelain insulator is connected to the side backwards to groove of positioning seat；The length of porcelain insulator is not less than 20cm.
Further, positioning seat and cover board are made of electro-insulating rubber and are used for the non-survey pressure side of threephase cable and cable connection
The metal exposed part of terminal all wraps up.
Further, porcelain insulator replaces with high-tension insulator；The class of insulation of porcelain insulator or high-tension insulator is not less than
10Kv or 35Kv.
Further, reactor group includes at least two sub- reactors in parallel；Threephase cable is used for 10kv high-tension switch cabinet
Cross-linked ethylene cable.
By adopting the above-described technical solution, the utility model has the advantage that
1. the present apparatus is in use, the setting compensating electric capacity in parallel in the two sides of divider, which can
Control is compensated to the capacitance in resonance circuit, to guarantee to find resonance point in tuning range；Guarantee effective
No replacement is required while test, and voltage-dividing capacitor influences the cost of experimental rig in turn；
2. in device, since the items of the threephase cable other end are isolated and being supported using insulating separator, not only
It prevents the cable of adjacent phase close to each other, causes the influence of test result or personal safety, vacantly produced compared to cable terminal
Raw uncertain influence, using after this insulating separator, can make test process more standardized, obtain operational safety
It improves.
Other advantages, target and feature of the utility model will be explained in the following description to a certain extent
It states, and to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, or
Person can be instructed from the practice of the utility model.The target of the utility model and other advantages can be said by following
Bright book and claims are achieved and obtained.
Detailed description of the invention
Fig. 1 is the structure chart of this cable voltage pilot system；
Fig. 2 is the structure chart of insulating separator；
Fig. 3 is the sectional structure chart of insulation connection seat.
Appended drawing reference: 1- variable-frequency power sources, 2- exciting transformer, 3- reactor group, 4- capacitive divider, 5- compensating electric capacity,
6- threephase cable, 7- insulating separator, 8- insulation connection seat, 9- porcelain insulator, 10- positioning seat, 11- cover board, 12- screw rod.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples:
Embodiment 1
It is as shown in the picture: a kind of cable voltage pilot system of variable-frequency series-resonance, including variable-frequency power sources 1, excitation transformation
Device 2, reactor group 3, capacitive divider 4, compensating electric capacity 5, cable body and insulating separator 7.
Variable-frequency power sources 1 is connected to the primary side of exciting transformer 2 and powers for it, and reactor group 3 and capacitive divider 4 are gone here and there
It is associated in the secondary side of exciting transformer 2, compensating electric capacity 5 is with the in parallel of the capacitive divider 4 and for capacitance compensation, capacitance partial pressure
The measurement end that device 4 exports is linked back variable-frequency power sources 1 by conducting wire with transmission measurement signal；Threephase cable 6 is surveyed the to be measured of pressure side and is communicated
The high-pressure side that conducting wire is electrically connected to capacitive divider 4 is crossed, the shielded layer of threephase cable 6 is electrically connected to capacitive divider by conducting wire
4 low-pressure side is simultaneously grounded simultaneously.
Positioned at the non-survey press bond insulating separator 7 of 6 other end of threephase cable, insulating separator 7 includes three insulation
Attachment base 8, three insulation connection seats 8 connect triangular in shape, the non-survey of threephase cable 6 by the porcelain insulator 9 of same size respectively
The three-phase of pressure side passes through cable connecting terminals respectively and is fixedly attached on corresponding insulation connection seat 8.
The series resonance pressure test principle of this pilot system are as follows: in the π √ LC of recirculating loop frequency f=1/2, circuit generates humorous
Vibration, the voltage on cable is Q times of excitation-transformation variable high-voltage end output voltage at this time.Q is system figure of merit, i.e. voltage resonance times
Number, generally tens to one hundred or more.First pass through adjust variable-frequency power sources 1 output frequency make circuit occur series resonance, then
1 output voltage of variable-frequency power sources is adjusted under conditions of loop resonance makes test product voltage reach test value；Due to the resonance in circuit, frequency conversion
The lesser output voltage of power supply 1 can generate higher test voltage on test product CX.
In the actual use of series resonance pressure test, the capacitor in resonance circuit is mended using compensating electric capacity 5
Control is repaid, so that circuit can reach resonance point, experiment purpose is realized, since the cost of derided capacitors is compared to common electricity
The price of appearance is higher, therefore, has while capable of guaranteeing that experiment is smoothly conscientious using the compensation of conventional capacitive memory capacitance
The control experimental cost of effect.
Embodiment 2
It is as shown in the picture: a kind of cable voltage pilot system of variable-frequency series-resonance, including variable-frequency power sources 1, excitation transformation
Device 2, reactor group 3, capacitive divider 4, compensating electric capacity 5, cable body and insulating separator 7.
Variable-frequency power sources 1 is connected to the primary side of exciting transformer 2 and powers for it, and reactor group 3 and capacitive divider 4 are gone here and there
It is associated in the secondary side of exciting transformer 2, compensating electric capacity 5 is with the in parallel of the capacitive divider 4 and for capacitance compensation, capacitance partial pressure
The measurement end that device 4 exports is linked back variable-frequency power sources 1 by conducting wire with transmission measurement signal；Threephase cable 6 is surveyed the to be measured of pressure side and is communicated
The high-pressure side that conducting wire is electrically connected to capacitive divider 4 is crossed, the shielded layer of threephase cable 6 is electrically connected to capacitive divider by conducting wire
4 low-pressure side is simultaneously grounded simultaneously；Reactor group 3 includes at least two sub- reactors in parallel；Threephase cable 6 is used for 10kv high pressure
The cross-linked ethylene cable of switchgear.
Positioned at the non-survey press bond insulating separator 7 of 6 other end of threephase cable, insulating separator 7 includes three insulation
Attachment base 8, three insulation connection seats 8 connect triangular in shape, the non-survey of threephase cable 6 by the high-tension insulator of same size respectively
The three-phase of pressure side passes through cable connecting terminals respectively and is fixedly attached on corresponding insulation connection seat 8.
Insulation connection seat 8 includes positioning seat 10, cover board 11 and screw rod 12, and fluted, groove is arranged in the side of positioning seat 10
Middle part is provided with positioning column, and cover board 11, which is used to cover, to be closed at the groove notch of the positioning seat 10 and fixed by screw rod 12；It is covering
The blind hole corresponding to positioning seat 10 is provided on plate 11；The non-any phase for surveying pressure side of threephase cable 6 passes through cable connecting terminals pair
It is preferably attached in the groove.
High-tension insulator is connected to the side backwards to groove of positioning seat 10；The length of high-tension insulator is not less than 20cm；
Positioning seat 10 and cover board 11 are made of electro-insulating rubber and are used for the non-metal for surveying pressure side and cable connecting terminals of threephase cable 6
Exposed part all wraps up.The class of insulation of high-tension insulator is not less than 10Kv or 35Kv.
There is cable in pressure-resistant experimentation, the other end is often arranged by the way of hanging, and this mode is not with true
It is qualitative, it may occur however that overhead positions variation or adjacent phase close to the problems such as, at this point, will will affect pressure resistance experiment result even
It is possible that influencing personal safety；This hanging mode bring is uncertain, can use 7 carry out standard of this insulating separator
Change, the terminal of threephase cable 6 can be relatively fixed, to prevent the variation of adjacent mutually close to each other and overhead positions to experiment
As a result influence can be realized the good insulation isolation at non-end to be measured.
Finally, it is stated that above embodiments are merely intended for describing the technical solutions of the present application, but not for limiting the present application, although ginseng
The utility model is described in detail according to preferred embodiment, those skilled in the art should understand that, it can be to this
The technical solution of utility model is modified or replaced equivalently, should all without departing from the objective and range of the technical program
Cover in the scope of the claims of the utility model.
Claims (6)
1. a kind of cable voltage pilot system of variable-frequency series-resonance, it is characterised in that: including variable-frequency power sources (1), excitation transformation
Device (2), reactor group (3), capacitive divider (4), compensating electric capacity (5), cable body and insulating separator (7)；Variable-frequency power sources
(1) it is connected to the primary side of exciting transformer (2) and powers for it, reactor group (3) and capacitive divider (4) are connected on excitation
The secondary side of transformer (2), compensating electric capacity (5) is with the in parallel of the capacitive divider (4) and for capacitance compensation, capacitive divider
(4) measurement end exported is linked back variable-frequency power sources (1) by conducting wire with transmission measurement signal；Threephase cable (6) surveys the to be measured of pressure side
The high-pressure side of capacitive divider (4) is mutually electrically connected to by conducting wire, the shielded layer of threephase cable (6) is electrically connected to electricity by conducting wire
Hold the low-pressure side of divider (4) and is grounded simultaneously；Positioned at the non-survey press bond insulating separator of threephase cable (6) other end
(7), insulating separator (7) includes three insulation connection seats (8), and three insulation connection seats (8) pass through the exhausted of same size respectively
Edge porcelain vase (9) connection is triangular in shape, and the non-three-phase for surveying pressure side of threephase cable (6) is fixedly attached to by cable connecting terminals respectively
On corresponding insulation connection seat (8).
2. the cable voltage pilot system of variable-frequency series-resonance according to claim 1, it is characterised in that: insulation connection seat
It (8) include positioning seat (10), cover board (11) and screw rod (12), the side setting of positioning seat (10) is fluted, setting in the middle part of groove
There is positioning column, cover board (11), which is used to cover, to be closed at the groove notch of the positioning seat (10) and fix by screw rod (12)；In cover board
(11) blind hole corresponding to positioning seat (10) is provided on；The non-any phase for surveying pressure side of threephase cable (6) passes through cable connection end
Son is to being preferably attached in the groove.
3. the cable voltage pilot system of variable-frequency series-resonance according to claim 2, it is characterised in that: porcelain insulator
(9) it is connected to the side backwards to groove of positioning seat (10)；The length of porcelain insulator (9) is not less than 20cm.
4. the cable voltage pilot system of variable-frequency series-resonance according to claim 3, it is characterised in that: positioning seat (10)
It is made and is used for the non-exposed metal/bare metal for surveying pressure side and cable connecting terminals of threephase cable (6) of electro-insulating rubber with cover board (11)
It all wraps up part.
5. the cable voltage pilot system of variable-frequency series-resonance according to claim 4, it is characterised in that: porcelain insulator
(9) high-tension insulator is replaced with；The class of insulation of porcelain insulator (9) or high-tension insulator is not less than 10Kv or 35Kv.
6. the cable voltage pilot system of variable-frequency series-resonance according to claim 5, it is characterised in that: reactor group
It (3) include at least two sub- reactors in parallel；Threephase cable (6) is used for the cross-linked ethylene cable of 10kv high-tension switch cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821369877.8U CN208752168U (en) | 2018-08-24 | 2018-08-24 | A kind of cable voltage pilot system of variable-frequency series-resonance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821369877.8U CN208752168U (en) | 2018-08-24 | 2018-08-24 | A kind of cable voltage pilot system of variable-frequency series-resonance |
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| Publication Number | Publication Date |
|---|---|
| CN208752168U true CN208752168U (en) | 2019-04-16 |
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| CN201821369877.8U Expired - Fee Related CN208752168U (en) | 2018-08-24 | 2018-08-24 | A kind of cable voltage pilot system of variable-frequency series-resonance |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110581644A (en) * | 2019-09-17 | 2019-12-17 | 广东美的制冷设备有限公司 | capacitance compensation circuit and capacitance compensator |
| CN112147468A (en) * | 2020-09-09 | 2020-12-29 | 中国能源建设集团华北电力试验研究院有限公司 | Three-phase system type power cable alternating current voltage withstand test method |
| CN112816840A (en) * | 2021-01-29 | 2021-05-18 | 国网陕西省电力公司电力科学研究院 | Cable line alternating current voltage withstand test method and system based on three-phase shunt reactor |
| CN113447778A (en) * | 2021-06-29 | 2021-09-28 | 国网陕西省电力公司电力科学研究院 | Method for performing high-resistance induction withstand voltage and partial discharge test by using circuit |
-
2018
- 2018-08-24 CN CN201821369877.8U patent/CN208752168U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110581644A (en) * | 2019-09-17 | 2019-12-17 | 广东美的制冷设备有限公司 | capacitance compensation circuit and capacitance compensator |
| CN110581644B (en) * | 2019-09-17 | 2020-12-11 | 广东美的制冷设备有限公司 | Capacitance compensation circuit and capacitance compensator |
| CN112147468A (en) * | 2020-09-09 | 2020-12-29 | 中国能源建设集团华北电力试验研究院有限公司 | Three-phase system type power cable alternating current voltage withstand test method |
| CN112816840A (en) * | 2021-01-29 | 2021-05-18 | 国网陕西省电力公司电力科学研究院 | Cable line alternating current voltage withstand test method and system based on three-phase shunt reactor |
| CN113447778A (en) * | 2021-06-29 | 2021-09-28 | 国网陕西省电力公司电力科学研究院 | Method for performing high-resistance induction withstand voltage and partial discharge test by using circuit |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190416 |