CN205176079U - A high -pressure frequency -modulated generator for water -resistant tree power cable detect - Google Patents
A high -pressure frequency -modulated generator for water -resistant tree power cable detect Download PDFInfo
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- CN205176079U CN205176079U CN201520844405.3U CN201520844405U CN205176079U CN 205176079 U CN205176079 U CN 205176079U CN 201520844405 U CN201520844405 U CN 201520844405U CN 205176079 U CN205176079 U CN 205176079U
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Abstract
The utility model relates to a high -pressure frequency -modulated generator for water -resistant tree power cable detect. The purpose is that the high -pressure frequency -modulated generator that provides can be used for water -resistant tree power cable's detection to evaluate, can effectively improve the efficiency that detects the aassessment moreover, shortens the cycle greatly. Technical scheme is: a high -pressure frequency -modulated generator for water -resistant tree power cable detect which characterized in that: D. C. Regulated power supply, power including connecting gradually close branch control circuit, full -bridge switch circuit, resonance circuit and high voltage transformers, and high voltage transformers's secondary coil is connected as the output and the sample that awaits measuring, the power closes branch control circuit and is connected with no -voltage access circuit, and full -bridge switch circuit passes through the drive circuit drive by pulse width modulation circuit, and pulse width modulation circuit is connected with frequency modulation circuit, and high voltage transformers is connected with the excessive pressure and opens circuit protection circuit and sample and puncture the protection circuit that opens circuit.
Description
Technical field
The utility model relates to pick-up unit technical field, is specifically related to a kind of high pressure frequency-modulated generator detected for water tree resistant power cable.
Background technology
Power cable is the cable for transmitting and distribute electric energy, is usually used in Urban Underground electrical network, power house lead line, industrial and mining enterprises' in-line power and power transmission line under crossing river seawater.Along with the development in epoch, people get more and more for the demand of environment-friendly material, also more and more stricter to the environmental requirement of cable product.
A kind of water resistant is had to set the crosslinked material of insulation in the middle-high voltage power cable material of China, can effectively prevent power cable from occurring water tree phenomenon (water tree phenomenon and insulating material are subject to extraneous factor effect and occur the phenomenon of microchannel, are the one of the main reasons of bringing out power cable destruction).The Performance Evaluation cycle at present for the crosslinked material of this type of water resistant tree insulation is very long, more cannot assess material as down-stream enterprise, material can only be made the third party that cable delivers authority and detect, all need larger input at money with in the time.
In order to address this problem, applicant designs a set of checkout equipment, this checkout equipment is by making its accelerated deterioration to cable energising, simulate actual use procedure, effectively can shorten the cycle that water tree produces, thus detect the water tree resistant property of material fast, solve the problem of water resistant tree material evaluation difficulty.
Utility model content
The purpose of this utility model solves Problems existing in above-mentioned background technology, a kind of high pressure frequency-modulated generator is provided, this high pressure frequency-modulated generator may be used for the check and evaluation of water tree resistant power cable, and effectively can improve the efficiency of check and evaluation, greatly shortens the cycle.
The utility model have employed following technical scheme:
A kind of high pressure frequency-modulated generator detected for water tree resistant power cable, it is characterized in that: comprise connect successively D.C. regulated power supply, power supply close sub-control circuit, full bridge switching circuit, resonant circuit and high-tension transformer, the secondary coil of high-tension transformer is connected with sample to be tested as output terminal; Power supply closes sub-control circuit and is connected with no-voltage place in circuit; full bridge switching circuit is driven by driving circuit by pulse-width modulation circuit; pulse-width modulation circuit is connected with frequency adjustment circuit, and high-tension transformer is connected with overvoltage breaking protection circuit and sample punctures breaking protection circuit.
As preferably, described power supply closes sub-control circuit and comprises and close button, point button and main contactor coil, and be connected with AC power after three connects successively, two normally open contacts of main contactor are separately positioned on two output terminals of D.C. regulated power supply.
As preferably, described no-voltage place in circuit comprises the first voltage comparator, the input end of this voltage comparator is connected with D.C. regulated power supply, and the output terminal of voltage comparator is connected with the coil of the 3rd contactor, and the normally closed interlock of the 3rd contactor is connected on the front end of closing button.
As preferably, described frequency adjustment circuit comprises for the variodenser of frequency coarse adjustment and the potentiometer for frequency fine tuning, and described variodenser and potentiometer are all connected with pulse-width modulation circuit.
As preferably, described resonant circuit comprises the electric capacity and varindor that are connected to full-bridge circuit two output terminals, and varindor and described variodenser link.
As preferably; described overvoltage breaking protection circuit comprises the second voltage comparator; the input end of the second voltage comparator is connected with the sample circuit of high-tension transformer secondary coil and pulse-width modulation circuit; output terminal is connected to coil and the first Sheffer stroke gate chip of the first contactor; first Sheffer stroke gate chip is connected to described pulse-width modulation circuit; one end of the normally closed interlock of the first contactor is connected to closes between button and point button, and the other end is connected to the normally closed interlock front end of the 3rd contactor by the normally open contact of the 3rd contactor.
As preferably; described sample punctures breaking protection circuit and comprises tertiary voltage comparer, the second Sheffer stroke gate chip; the input end of tertiary voltage comparer is connected with the sample circuit of high-tension transformer primary coil; output terminal is connected with the coil of the second contactor, between the sample circuit that described second Sheffer stroke gate chip is connected to high-tension transformer primary coil and the sample circuit of secondary coil.
The beneficial effects of the utility model are: the utility model utilizes the frequency of frequency adjustment circuit regulation output voltage; and puncture by overvoltage breaking protection circuit and sample the safety that breaking protection circuit ensures sample; one-piece construction is simple; actual use procedure can be simulated; thus effectively shorten the cycle of water tree generation; detect the water tree resistant property of material fast, solve the problem of water resistant tree material evaluation difficulty.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model.
Fig. 2 is circuit diagram of the present utility model.
Fig. 3 is AC power filtering circuit schematic diagram.
Fig. 4 is the structural representation of no-voltage place in circuit.
Fig. 5 is the structural representation of overvoltage breaking protection circuit.
Fig. 6 is the structural representation that sample punctures breaking protection circuit.
Embodiment
Below in conjunction with Figure of description, the utility model is described in further detail, but the utility model is not limited to following examples.
As shown in Figure 1 and Figure 2, a kind of high pressure frequency-modulated generator detected for water tree resistant power cable described in the utility model, comprise connect successively D.C. regulated power supply, power supply close sub-control circuit, full bridge switching circuit, resonant circuit and high-tension transformer, the secondary coil of high-tension transformer is connected with sample to be tested as output terminal.Described driving circuit adopts two semi-bridge type driving element IR2308, and full bridge switching circuit adopts four power Mosfet to manage (IRFP460).Power supply closes sub-control circuit and is connected with no-voltage place in circuit; full bridge switching circuit is driven by driving circuit by pulse-width modulation circuit (master chip adopts TL494); pulse-width modulation circuit is connected with frequency adjustment circuit, and high-tension transformer is connected with overvoltage breaking protection circuit and sample punctures breaking protection circuit.
As shown in Figure 4, described power supply closes sub-control circuit and comprises conjunction button K11, point button K12 and main contactor coil Z, be connected with AC power after three connects successively, two normally open contact Jz of main contactor are separately positioned on two output terminals of D.C. regulated power supply.Two output terminals of D.C. regulated power supply are connected on full bridge switching circuit.As shown in Figure 3, AC power is provided with filtering circuit, comprises several electric capacity, inductance and two the direct current 12V switching power supplies that are connected in parallel on ac power input end.
As shown in Figure 4, described no-voltage place in circuit comprises the first voltage comparator Q1 (adopting LM311), the reverse input end of this voltage comparator is connected with D.C. regulated power supply, the output terminal of voltage comparator is connected with the coil Z3 of the 3rd contactor, and the normally closed interlock J3 of the 3rd contactor is connected on the front end of closing button.
As shown in Figure 2, described frequency adjustment circuit comprises the variodenser K1 for frequency coarse adjustment and the potentiometer R for frequency fine tuning, and described variodenser and potentiometer are all connected with pulse-width modulation circuit.Described resonant circuit comprises the electric capacity and varindor K2 that are connected to full-bridge circuit two output terminals, and varindor and described variodenser link.
As shown in Figure 5, described overvoltage breaking protection circuit comprises the second voltage comparator Q2 (adopting LM311), the input end in the same way of the second voltage comparator is connected with the sample circuit of high-tension transformer secondary coil and pulse-width modulation circuit, output terminal is connected to coil Z1 and the first Sheffer stroke gate chip U1 (adopting CD4011) of the first contactor, first Sheffer stroke gate chip is connected to described pulse-width modulation circuit, one end of the normally closed interlock of the first contactor is connected to closes between button and point button, the other end is connected to the normally closed interlock front end of the 3rd contactor by the normally open contact of the 3rd contactor.
As shown in Figure 6; described sample punctures breaking protection circuit and comprises tertiary voltage comparer Q3 (adopting LM311), the second Sheffer stroke gate chip U2 (adopting CD4011); the input end in the same way of tertiary voltage comparer is connected with the sample circuit of high-tension transformer primary coil; output terminal is connected with the coil Z2 of the second contactor, between the sample circuit that described second Sheffer stroke gate chip is connected to high-tension transformer primary coil and the sample circuit of secondary coil.
The utility model employs the switching power supply (with reference to Fig. 2,3) of two DC12V, 1A; The adjustable stabilized voltage supply (with reference to Fig. 2,4) of DC0-200V, a 2A.The voltage-regulation of adjustable stabilized voltage supply divides fourth gear, and namely DC voltage rises step by step with fourth gear such as every grade of 0.1V, 1V, 10V and 100V, and short-circuit protection power supply can be selected arbitrarily between 0-2A.
As seen from Figure 4, when adjustable stabilized voltage supply output voltage is less than 12V, the 3 pin voltages of the first voltage comparator LM311 are less than 0.6V, and thus 7 pin of the first voltage comparator LM311 are noble potential, meet the coil Z of the 3rd contactor
3two ends are noble potential, and the 3rd contactor is failure to actuate, contact J
3keep normally off, press " conjunction " button, main contactor Z can action, J
z3, J
zclosed, the AB 2 of adjustable stabilized voltage supply output terminal has voltage, and voltage continues to raise, and the 3rd contactor Z3 action, contact J3 opens a way, due to contact J
z3with contact J
1all closed, do not affect the power supply of the coil Z to main contactor.On the contrary, during beginning, 200V adjustable stabilized voltage supply output voltage is greater than 12V, and 7 pin of the first voltage comparator LM311 become electronegative potential, and contact J3 becomes open circuit by normally closed, and pressing "ON" button cannot power to coil Z, and AB 2 does not have voltage.
In overvoltage breaking protection circuit; when load is less; because circuit is close to tuning-points; small voltage on high-tension transformer is elementary often forms very high voltage on secondary; substantially exceed and need voltage; in order to prevent too high voltages from damaging element, setting is when high-frequency and high-voltage peak value is more than 8.4kV, and circuit disconnects automatically.
Known 1 pin when TL494 integrated package close to zero potential and 15 pin current potentials lower than 16 pin current potential time, TL494 produces the square-wave voltage of vibration, and on the contrary, when the current potential of one of 1 pin or 15 pin does not meet above-mentioned current potential, TL494 stops exporting square-wave voltage.
As shown in Figure 5, sampled voltage becomes DC voltage through bridge rectifier, 5k potentiometer in regulating circuit parameter and Fig. 5, when high-tension transformer exports 8.4kV, 15 pin of TL494 reaches vibration final voltage, and make the 7 pin current potential upsets of the second voltage comparator LM311, become noble potential from electronegative potential, 7 pin electronegative potentials, through the first Sheffer stroke gate chip CD4011 twice current potential conversion, are finally still passed to 1 pin of TL494 with noble potential, 1 pin becomes noble potential by electronegative potential, makes TL494 vibrate equally and stops.When 7 pin of the second voltage comparator LM311 become noble potential from electronegative potential, the same current potential in coil Z1 two ends of the first contactor, contact J1 opens, and as seen from Figure 4, the coil Z of main contactor opens a way, and contact Jz separately, has cut off bridge switch power tube power supply.
As shown in Figure 6, sample punctures breaking protection circuit, in general circuit when sample punctures; in high tension loop, electric current is multiplied; utilize electric current to be increased in the increase of voltage in resistance in series, make one of 1 pin or the 15 pin current potential of TL494 increase, thus stop exporting square wave.In apparatus of the present invention, test electrical breakdown, the condition of resonance of main circuit, not only electric current does not increase, in high-tension transformer, electric current reduces to zero on the contrary, cannot use general short-circuit protection method.
That when utilizing sample to puncture, main circuit current reduces to zero principle in the protection of this device, from Fig. 6 voltage sampling circuit 2, before sample does not puncture, along with the increase of HF voltage on sample, sampled voltage also increases, before the 7 pin current potential upsets of tertiary voltage comparer LM311, the output potential of the second Sheffer stroke gate chip CD4011 is by high step-down, when the 3 pin voltage-to-grounds of tertiary voltage comparer LM311 are more than 5.1V, 7 pin current potentials are by high step-down, contactor Z2 action, contact J2 closes, the electronegative potential that second Sheffer stroke gate chip CD4011 exports is passed to 15 pin (consulting Fig. 2) of TL494 through diode 4007 through connector CT2 and is passed on the 5k resistance of voltage sampling circuit 1, do not affect the normal running conditions of TL494.When sample punctures suddenly, in voltage sampling circuit 2, the current potential of c point becomes rapidly zero (consulting Fig. 6), the output voltage of the second Sheffer stroke gate chip CD4011 is uprised by low, and d point current potential declines very slowly due to the existence of 100 μ electric capacity, contactor Z2 still makes contact J2 at closure state, and the noble potential (11V) that the second Sheffer stroke gate chip CD4011 exports forces TL494 to stop resonance; Make again the coil Z of main contactor open a way by voltage sampling circuit, contact JZ separately, has cut off bridge switch power power-supply (consulting Fig. 5).
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various amendment or supplements or adopt similar mode to substitute to described specific embodiment; but can't depart from spirit of the present utility model or surmount the scope that appended claims defines, these changes also should be considered as protection domain of the present utility model.
Claims (7)
1. the high pressure frequency-modulated generator detected for water tree resistant power cable, it is characterized in that: comprise connect successively D.C. regulated power supply, power supply close sub-control circuit, full bridge switching circuit, resonant circuit and high-tension transformer, the secondary coil of high-tension transformer is connected with sample to be tested as output terminal; Power supply closes sub-control circuit and is connected with no-voltage place in circuit; full bridge switching circuit is driven by driving circuit by pulse-width modulation circuit; pulse-width modulation circuit is connected with frequency adjustment circuit, and high-tension transformer is connected with overvoltage breaking protection circuit and sample punctures breaking protection circuit.
2. a kind of high pressure frequency-modulated generator detected for water tree resistant power cable according to claim 1, it is characterized in that: described power supply closes sub-control circuit and comprises conjunction button (K11), point button (K12) and main contactor coil (Z), be connected with AC power after three connects successively, two normally open contacts (Jz) of main contactor are separately positioned on two output terminals of D.C. regulated power supply.
3. a kind of high pressure frequency-modulated generator detected for water tree resistant power cable according to claim 2, it is characterized in that: described no-voltage place in circuit comprises the first voltage comparator (Q1), the input end of this voltage comparator is connected with D.C. regulated power supply, the output terminal of voltage comparator is connected with the coil (Z3) of the 3rd contactor, and the normally closed interlock (J3) of the 3rd contactor is connected on the front end of closing button.
4. a kind of high pressure frequency-modulated generator detected for water tree resistant power cable according to claim 1, it is characterized in that: described frequency adjustment circuit comprises the variodenser (K1) for frequency coarse adjustment and the potentiometer (R) for frequency fine tuning, and described variodenser and potentiometer are all connected with pulse-width modulation circuit.
5. a kind of high pressure frequency-modulated generator detected for water tree resistant power cable according to claim 4, it is characterized in that: described resonant circuit comprises the electric capacity and varindor (K2) that are connected to full-bridge circuit two output terminals, and varindor and described variodenser link.
6. a kind of high pressure frequency-modulated generator detected for water tree resistant power cable according to claim 1, it is characterized in that: described overvoltage breaking protection circuit comprises the second voltage comparator (Q2), the input end of the second voltage comparator is connected with the sample circuit of high-tension transformer secondary coil and pulse-width modulation circuit, output terminal is connected to coil (Z1) and the first Sheffer stroke gate chip (U1) of the first contactor, first Sheffer stroke gate chip is connected to described pulse-width modulation circuit, one end of the normally closed interlock (J1) of the first contactor is connected to closes between button and point button, the other end is connected to normally closed interlock (J3) front end of the 3rd contactor by the normally open contact (Jz3) of the 3rd contactor.
7. a kind of high pressure frequency-modulated generator detected for water tree resistant power cable according to claim 6; it is characterized in that: described sample punctures breaking protection circuit and comprises tertiary voltage comparer (Q3), the second Sheffer stroke gate chip (U2); the input end of tertiary voltage comparer is connected with the sample circuit of high-tension transformer primary coil; output terminal is connected with the coil (Z2) of the second contactor, between the sample circuit that described second Sheffer stroke gate chip is connected to high-tension transformer primary coil and the sample circuit of secondary coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520844405.3U CN205176079U (en) | 2015-10-28 | 2015-10-28 | A high -pressure frequency -modulated generator for water -resistant tree power cable detect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520844405.3U CN205176079U (en) | 2015-10-28 | 2015-10-28 | A high -pressure frequency -modulated generator for water -resistant tree power cable detect |
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| CN205176079U true CN205176079U (en) | 2016-04-20 |
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| CN201520844405.3U Active CN205176079U (en) | 2015-10-28 | 2015-10-28 | A high -pressure frequency -modulated generator for water -resistant tree power cable detect |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018896A (en) * | 2016-06-18 | 2016-10-12 | 国网辽宁省电力有限公司抚顺供电公司 | Special programmable power source for pole grounding resistance measuring device |
-
2015
- 2015-10-28 CN CN201520844405.3U patent/CN205176079U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018896A (en) * | 2016-06-18 | 2016-10-12 | 国网辽宁省电力有限公司抚顺供电公司 | Special programmable power source for pole grounding resistance measuring device |
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