CN205353288U - Power cable oscillating wave partial discharge detector circuit - Google Patents
Power cable oscillating wave partial discharge detector circuit Download PDFInfo
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- CN205353288U CN205353288U CN201620097083.5U CN201620097083U CN205353288U CN 205353288 U CN205353288 U CN 205353288U CN 201620097083 U CN201620097083 U CN 201620097083U CN 205353288 U CN205353288 U CN 205353288U
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Abstract
The utility model discloses a power cable oscillating wave partial discharge detector circuit, receive the discharge oscilloscope of signal of examination power cable including being used for the test to receive examination power cable to discharge the oscillating wave circuit of electric quantity with being used for observing, the oscillating wave circuit includes high voltage DC power, relay protection circuit, switch protection circuit and the damped oscillation circuit that connects gradually, and is used for gathering receive examination power cable's voltage data and trigger switch protection circuit conduction's voltage acquisition trigger circuit, voltage acquisition trigger circuit is including the voltage acquisition circuit, optoelectronic isolation circuit and the drive protection circuit that connect gradually, oscilloscope's input meets with the output of damped oscillation circuit, the utility model relates to a novelty, simple structure adopts the relay protection circuit to avoid the high voltage DC power directly to charged by examination power cable, avoids test procedure to cause the damage to cable insulation, easy operation, small, the practicality is strong.
Description
Technical field
This utility model belongs to power cable insulation detection technique field, is specifically related to a kind of power cable oscillation wave partial discharge testing circuit.
Background technology
Development along with urban economy, urban planning is gradually improved, maintaining sustained and rapid growth of electricity need load, the requirement of power supply reliability is more and more higher, conventional overhead power line is substituted by buried power cable gradually, it is adapt to high reliability and space-saving developing direction that urban distribution network realizes cable comprehensively, power cable can be subject to the impact of multiple unfavorable factor after putting into operation, cause that cable breaks down often, failure cause mainly includes external force and destroys, animal causes short circuit accident, body insulation breakdown and cable connector blast, statistical data shows, in power equipment and cable, the fault of more than 50% comes from body Fault of Insulating Breakdown.Therefore, reply cable carries out periodic preventative test, find cable insulation defect in advance, making cable be repaired timely or change, thus avoiding the generation of accident, usual cable preventive trial is based on destructive testing, although the defect existed in cable insulation can effectively be found, but the cable insulation after test can produce deterioration, and its pilot system generally all comprises multiple equipment, is not easy to on-the-spot test；Wave of oscillation test system, it it is a kind of emerging cable insulation fault detection technique, it inspires the local discharge signal of cable insulation fault location by tested cable is applied damped oscillation wave voltage, and it is carried out effectively detection thus judging the quality of cable insulation, the shortcoming of existing power cable wave of oscillation testing experiment is: the first, adopting frequency conversion resonance vibration pressure-proof assay device that power cable is charged, needed for equipment, power supply capacity is big, heavy, not readily transportable, cause field experimentation difficulty；The second, adopting DC high-voltage power supply that power cable is charged, the charging interval is longer, reaches several minutes, accelerates cable insulation aging.
Utility model content
Technical problem to be solved in the utility model is in that for above-mentioned deficiency of the prior art; a kind of power cable oscillation wave partial discharge testing circuit is provided; it is novel in design rationally, simple in construction, adopts relay protection circuit to avoid DC high-voltage power supply directly tested power cable to be charged; avoid test process that cable insulation is caused damage; simple to operate, carry portable, volume is little; practical, it is simple to promote the use of.
For solving above-mentioned technical problem; the technical solution adopted in the utility model is: a kind of power cable oscillation wave partial discharge testing circuit; it is characterized in that: include the wave of oscillation circuit for testing tested power cable discharge electricity amount and for observing the oscillograph of tested power cable discharge signal; described wave of oscillation circuit includes the DC high-voltage power supply, relay protection circuit, switch protecting circuit and the damping oscillation circuit that are sequentially connected with, and for gathering the voltage data of described tested power cable and triggering the voltage acquisition triggering circuit of described switch protecting circuit conducting；Described voltage acquisition triggers voltage collection circuit, photoelectric isolating circuit and the Drive Protecting Circuit that circuit includes being sequentially connected with; the input of described voltage collection circuit connects with the outfan of damping oscillation circuit; the outfan of described Drive Protecting Circuit connects with the input of switch protecting circuit, and described oscillographic input connects with the outfan of damping oscillation circuit；Described damping oscillation circuit includes inductance L1, diode D2 and two end interface JP1, one end of described inductance L1 connects with the negative electrode of diode D2, the other end of inductance L1 and one end of two end interface JP1 connect, the other end of two end interface JP1 connects with the anode of diode D2, and described tested power cable is arranged on two end interface JP1.
Above-mentioned a kind of power cable oscillation wave partial discharge testing circuit, it is characterised in that: described DC high-voltage power supply is DC high-voltage power supply DY1.
Above-mentioned a kind of power cable oscillation wave partial discharge testing circuit, it is characterized in that: described relay protection circuit includes dpdt relay K1, amplifier U1, charging capacitor C1 and DC low voltage power supply BT1, one movable contact 1 of described dpdt relay K1 and the positive pole of DC high-voltage power supply DY1+connect, another movable contact 4 of dpdt relay K1 connects with the link of one end of inductance L1 and the negative electrode of diode D2, one normally opened contact 3 of dpdt relay K1 is unsettled, one normally-closed contact 2 of dpdt relay K1 and the charged electric capacity C1 ground connection of another normally opened contact 6, one coil-end of dpdt relay K1 connects with the colelctor electrode of audion Q2, the base stage of audion Q2 connects through the outfan of resistance R1 and amplifier U1, the in-phase input end of amplifier U1 connects with a normally-closed contact 2 of dpdt relay K1 and the link of another normally opened contact 6, the inverting input of amplifier U1 divides two-way, one tunnel connects through the positive pole of resistance R2 with DC low voltage power supply BT1, another road connects with the negative electrode of Zener diode D3；The negative pole of DC low voltage power supply BT1 and the equal ground connection of anode of Zener diode D3.
Above-mentioned a kind of power cable oscillation wave partial discharge testing circuit; it is characterized in that: described switch protecting circuit is MOSFET pipe Q1; the link of the negative electrode of the drain electrode of described MOSFET pipe Q1 and another movable contact 4 of dpdt relay K1, one end of inductance L1 and diode D2 connects, the source ground of MOSFET pipe Q1.
Above-mentioned a kind of power cable oscillation wave partial discharge testing circuit, it is characterized in that: described voltage collection circuit includes voltage transformer T1, diode D4 in parallel in the same direction and diode D5, diode D8 in parallel in the same direction and diode D9, diode D6 in parallel in the same direction and diode D7 and diode D10 in parallel in the same direction and diode D11, the link of the other end of one end, described voltage transformer T1 former limit and inductance L1 and one end of two end interface JP1 connects, two-way is divided through resistance R6 in voltage transformer T1 secondary one end, one tunnel connects with the negative electrode of diode D4 in parallel in the same direction and diode D5, another road connects with the anode of diode D6 in parallel in the same direction and diode D7；Diode D4 in parallel in the same direction and the anode of diode D5 connect with the negative electrode of diode D8 in parallel in the same direction and diode D9, diode D6 in parallel in the same direction and the negative electrode of diode D7 connect with the anode of diode D10 in parallel in the same direction and diode D11, the minus earth of diode D8 in parallel in the same direction and the anode of diode D9 and in the same direction the diode D10 and diode D11 of parallel connection.
Above-mentioned a kind of power cable oscillation wave partial discharge testing circuit, it is characterized in that: described photoelectric isolating circuit is chip TLP521-2, the 1st pin of described chip TLP521-2 and the link of the 4th pin connect through the anode of resistance R7 with diode D6 in parallel in the same direction and diode D7.
Above-mentioned a kind of power cable oscillation wave partial discharge testing circuit; it is characterized in that: described Drive Protecting Circuit includes audion Q3 and chip PC923; the base stage of described audion Q3 connects with the link of the 8th pin of chip TLP521-2 and the 6th pin; the colelctor electrode of audion Q3 divides two-way; one tunnel connects with the 3rd pin of chip PC923; another road connects through resistance R5 and 5V power supply, and the 6th pin of chip PC923 connects with the grid of MOSFET pipe Q1.
This utility model compared with prior art has the advantage that
1, this utility model is by arranging relay protection circuit; it is charging capacitor C1 charging by DC high-voltage power supply; when charging capacitor C1 charging voltage is more than the DC low voltage power supply BT1 reference power supply provided; the loop that charging capacitor C1 is damping oscillation circuit charging is connected in dpdt relay K1 tripping operation; charging capacitor C1 is the charging of tested power cable; avoiding DC high-voltage power supply directly the charging of tested power cable to be caused cable insulation is caused damage, circuit is simple, it is simple to promote the use of.
2, this utility model triggers circuit by arranging voltage acquisition; gather tested power cable maximum charge; when the voltage collection circuit in voltage acquisition triggering circuit collects voltage peak on tested power cable; switch protecting circuit conducting is driven by Drive Protecting Circuit; damping oscillation circuit forms attenuation oscillasion impulse on tested power cable, is checked voltage and frequency by oscillograph, it is thus achieved that the insulation status of tested power cable; reliable and stable, result of use is good.
3, this utility model is novel in design rationally, and volume is little, carries portable, easy for installation, practical, it is simple to promote the use of.
In sum, this utility model is novel in design rationally, simple in construction; relay protection circuit is adopted to avoid DC high-voltage power supply directly tested power cable to be charged, it is to avoid cable insulation is caused damage by test process, simple to operate; volume is little, practical, it is simple to promote the use of.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present utility model.
Fig. 2 is the circuit connecting relation schematic diagram of this utility model DC high-voltage power supply, relay protection circuit, switch protecting circuit and damping oscillation circuit.
Fig. 3 is the circuit connecting relation schematic diagram of this utility model voltage collection circuit, photoelectric isolating circuit and Drive Protecting Circuit.
Description of reference numerals:
1 DC high-voltage power supply；2 relay protection circuits；3 switch protecting circuits；
4 damping oscillation circuits；5 oscillographs；6 voltage collection circuits；
7 photoelectric isolating circuits；8 Drive Protecting Circuit.
Detailed description of the invention
As depicted in figs. 1 and 2; this utility model includes the wave of oscillation circuit for testing tested power cable discharge electricity amount and for observing the oscillograph 5 of tested power cable discharge signal; described wave of oscillation circuit includes the DC high-voltage power supply 1, relay protection circuit 2, switch protecting circuit 3 and the damping oscillation circuit 4 that are sequentially connected with, and for gathering the voltage data of described tested power cable and triggering the voltage acquisition triggering circuit of described switch protecting circuit 3 conducting；Described voltage acquisition triggers voltage collection circuit 6, photoelectric isolating circuit 7 and the Drive Protecting Circuit 8 that circuit includes being sequentially connected with; the input of described voltage collection circuit 6 connects with the outfan of damping oscillation circuit 4; the outfan of described Drive Protecting Circuit 8 connects with the input of switch protecting circuit 3, and the input of described oscillograph 5 connects with the outfan of damping oscillation circuit 4；Described damping oscillation circuit 4 includes inductance L1, diode D2 and two end interface JP1, one end of described inductance L1 connects with the negative electrode of diode D2, the other end of inductance L1 and one end of two end interface JP1 connect, the other end of two end interface JP1 connects with the anode of diode D2, and described tested power cable is arranged on two end interface JP1.
As in figure 2 it is shown, in the present embodiment, described DC high-voltage power supply 1 is DC high-voltage power supply DY1.
It should be noted that DC high-voltage power supply DY1 is low capacity DC high-voltage power supply, volume is little, easy to carry.
As shown in Figure 2, in the present embodiment, described relay protection circuit 2 includes dpdt relay K1, amplifier U1, charging capacitor C1 and DC low voltage power supply BT1, one movable contact 1 of described dpdt relay K1 and the positive pole of DC high-voltage power supply DY1+connect, another movable contact 4 of dpdt relay K1 connects with the link of one end of inductance L1 and the negative electrode of diode D2, one normally opened contact 3 of dpdt relay K1 is unsettled, one normally-closed contact 2 of dpdt relay K1 and the charged electric capacity C1 ground connection of another normally opened contact 6, one coil-end of dpdt relay K1 connects with the colelctor electrode of audion Q2, the base stage of audion Q2 connects through the outfan of resistance R1 and amplifier U1, the in-phase input end of amplifier U1 connects with a normally-closed contact 2 of dpdt relay K1 and the link of another normally opened contact 6, the inverting input of amplifier U1 divides two-way, one tunnel connects through the positive pole of resistance R2 with DC low voltage power supply BT1, another road connects with the negative electrode of Zener diode D3；The negative pole of DC low voltage power supply BT1 and the equal ground connection of anode of Zener diode D3.
As shown in Figure 2; in the present embodiment; described switch protecting circuit 3 is MOSFET pipe Q1, and the link of the negative electrode of the drain electrode of described MOSFET pipe Q1 and another movable contact 4 of dpdt relay K1, one end of inductance L1 and diode D2 connects, the source ground of MOSFET pipe Q1.
As shown in Figure 3, in the present embodiment, described voltage collection circuit 6 includes voltage transformer T1, diode D4 in parallel in the same direction and diode D5, diode D8 in parallel in the same direction and diode D9, diode D6 in parallel in the same direction and diode D7 and diode D10 in parallel in the same direction and diode D11, the link of the other end of one end, described voltage transformer T1 former limit and inductance L1 and one end of two end interface JP1 connects, two-way is divided through resistance R6 in voltage transformer T1 secondary one end, one tunnel connects with the negative electrode of diode D4 in parallel in the same direction and diode D5, another road connects with the anode of diode D6 in parallel in the same direction and diode D7；Diode D4 in parallel in the same direction and the anode of diode D5 connect with the negative electrode of diode D8 in parallel in the same direction and diode D9, diode D6 in parallel in the same direction and the negative electrode of diode D7 connect with the anode of diode D10 in parallel in the same direction and diode D11, the minus earth of diode D8 in parallel in the same direction and the anode of diode D9 and in the same direction the diode D10 and diode D11 of parallel connection.
As it is shown on figure 3, in the present embodiment, described photoelectric isolating circuit 7 is chip TLP521-2, the 1st pin of described chip TLP521-2 and the link of the 4th pin connect through the anode of resistance R7 with diode D6 in parallel in the same direction and diode D7.
As shown in Figure 3; in the present embodiment; described Drive Protecting Circuit 8 includes audion Q3 and chip PC923; the base stage of described audion Q3 connects with the link of the 8th pin of chip TLP521-2 and the 6th pin; the colelctor electrode of audion Q3 divides two-way; one tunnel connects with the 3rd pin of chip PC923, and another road connects through resistance R5 and 5V power supply, and the 6th pin of chip PC923 connects with the grid of MOSFET pipe Q1.
When this utility model uses, tested for a part for power cable power cable is arranged on two end interface JP1 in damping oscillation circuit 4, it is the charging capacitor C1 charging in relay protection circuit 2 that relay protection circuit 2 connects DC high-voltage power supply 1, the tested power cable installed on two end interface JP1 in damping oscillation circuit 4 does not have the quantity of electric charge, when DC high-voltage power supply 1 be charging capacitor C1 charge volume in relay protection circuit 2 higher than DC low voltage power supply BT1 reference voltage source in relay protection circuit 2 time, amplifier U1 turns on, triode ON, dpdt relay K1 trips, charging capacitor C1 connects damping oscillation circuit 4 and is the tested power cable charging installed on two end interface JP1, tested power cable charging voltage is gathered by voltage collection circuit 6, when voltage collection circuit 6 collects voltage peak on tested power cable, turned on by photoelectric isolating circuit 7, MOSFET pipe Q1 conducting in Drive Protecting Circuit 8 conducting drive switches protection circuit 3, relay K 1 tripping operation continues as charging capacitor C1 charging, damping oscillation circuit 4 forms attenuation oscillasion impulse on tested power cable, the link that oscillograph 5 is connected to inductance L1 and two end interface JP1 checks voltage waveform and frequency signal, obtain the insulation status of tested power cable, avoid using variable-frequency power sources and Large Copacity power supply, whole weight of equipment is light, compact to design, it is easy to on-the-spot test；Avoiding the DC charging directly power cable carried out, power cable is solely subjected to the charging capacitor C1 Sasser voltage produced in process of the test, cable insulation will not cause damage, and result of use is good.
The above; it it is only preferred embodiment of the present utility model; not this utility model is imposed any restrictions; every any simple modification, change and equivalent structure change above example made according to this utility model technical spirit, all still falls within the protection domain of technical solutions of the utility model.
Claims (7)
1. a power cable oscillation wave partial discharge testing circuit; it is characterized in that: include the wave of oscillation circuit for testing tested power cable discharge electricity amount and for observing the oscillograph (5) of tested power cable discharge signal; described wave of oscillation circuit includes the DC high-voltage power supply (1), relay protection circuit (2), switch protecting circuit (3) and the damping oscillation circuit (4) that are sequentially connected with, and for gathering the voltage data of described tested power cable and triggering the voltage acquisition triggering circuit that described switch protecting circuit (3) turns on；Described voltage acquisition triggers voltage collection circuit (6), photoelectric isolating circuit (7) and the Drive Protecting Circuit (8) that circuit includes being sequentially connected with; the input of described voltage collection circuit (6) connects with the outfan of damping oscillation circuit (4); the outfan of described Drive Protecting Circuit (8) connects with the input of switch protecting circuit (3), and the input of described oscillograph (5) connects with the outfan of damping oscillation circuit (4)；Described damping oscillation circuit (4) includes inductance L1, diode D2 and two end interface JP1, one end of described inductance L1 connects with the negative electrode of diode D2, the other end of inductance L1 and one end of two end interface JP1 connect, the other end of two end interface JP1 connects with the anode of diode D2, and described tested power cable is arranged on two end interface JP1.
2. a kind of power cable oscillation wave partial discharge testing circuit described in claim 1, it is characterised in that: described DC high-voltage power supply (1) is DC high-voltage power supply DY1.
3. a kind of power cable oscillation wave partial discharge testing circuit described in claim 2, it is characterized in that: described relay protection circuit (2) includes dpdt relay K1, amplifier U1, charging capacitor C1 and DC low voltage power supply BT1, one movable contact 1 of described dpdt relay K1 and the positive pole of DC high-voltage power supply DY1+connect, another movable contact 4 of dpdt relay K1 connects with the link of one end of inductance L1 and the negative electrode of diode D2, one normally opened contact 3 of dpdt relay K1 is unsettled, one normally-closed contact 2 of dpdt relay K1 and the charged electric capacity C1 ground connection of another normally opened contact 6, one coil-end of dpdt relay K1 connects with the colelctor electrode of audion Q2, the base stage of audion Q2 connects through the outfan of resistance R1 and amplifier U1, the in-phase input end of amplifier U1 connects with a normally-closed contact 2 of dpdt relay K1 and the link of another normally opened contact 6, the inverting input of amplifier U1 divides two-way, one tunnel connects through the positive pole of resistance R2 with DC low voltage power supply BT1, another road connects with the negative electrode of Zener diode D3；The negative pole of DC low voltage power supply BT1 and the equal ground connection of anode of Zener diode D3.
4. a kind of power cable oscillation wave partial discharge testing circuit described in claim 3; it is characterized in that: described switch protecting circuit (3) is MOSFET pipe Q1; the link of the negative electrode of the drain electrode of described MOSFET pipe Q1 and another movable contact 4 of dpdt relay K1, one end of inductance L1 and diode D2 connects, the source ground of MOSFET pipe Q1.
5. a kind of power cable oscillation wave partial discharge testing circuit described in claim 4, it is characterized in that: described voltage collection circuit (6) includes voltage transformer T1, diode D4 in parallel in the same direction and diode D5, diode D8 in parallel in the same direction and diode D9, diode D6 in parallel in the same direction and diode D7 and diode D10 in parallel in the same direction and diode D11, the link of the other end of one end, described voltage transformer T1 former limit and inductance L1 and one end of two end interface JP1 connects, two-way is divided through resistance R6 in voltage transformer T1 secondary one end, one tunnel connects with the negative electrode of diode D4 in parallel in the same direction and diode D5, another road connects with the anode of diode D6 in parallel in the same direction and diode D7；Diode D4 in parallel in the same direction and the anode of diode D5 connect with the negative electrode of diode D8 in parallel in the same direction and diode D9, diode D6 in parallel in the same direction and the negative electrode of diode D7 connect with the anode of diode D10 in parallel in the same direction and diode D11, the minus earth of diode D8 in parallel in the same direction and the anode of diode D9 and in the same direction the diode D10 and diode D11 of parallel connection.
6. a kind of power cable oscillation wave partial discharge testing circuit described in claim 5, it is characterized in that: described photoelectric isolating circuit (7) is chip TLP521-2, the 1st pin of described chip TLP521-2 and the link of the 4th pin connect through the anode of resistance R7 with diode D6 in parallel in the same direction and diode D7.
7. a kind of power cable oscillation wave partial discharge testing circuit described in claim 6; it is characterized in that: described Drive Protecting Circuit (8) includes audion Q3 and chip PC923; the base stage of described audion Q3 connects with the link of the 8th pin of chip TLP521-2 and the 6th pin; the colelctor electrode of audion Q3 divides two-way; one tunnel connects with the 3rd pin of chip PC923; another road connects through resistance R5 and 5V power supply, and the 6th pin of chip PC923 connects with the grid of MOSFET pipe Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620097083.5U CN205353288U (en) | 2016-01-29 | 2016-01-29 | Power cable oscillating wave partial discharge detector circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620097083.5U CN205353288U (en) | 2016-01-29 | 2016-01-29 | Power cable oscillating wave partial discharge detector circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205353288U true CN205353288U (en) | 2016-06-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620097083.5U Expired - Fee Related CN205353288U (en) | 2016-01-29 | 2016-01-29 | Power cable oscillating wave partial discharge detector circuit |
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| Country | Link |
|---|---|
| CN (1) | CN205353288U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505550A (en) * | 2017-09-07 | 2017-12-22 | 广州供电局有限公司 | Detection impedance for cable partial discharge detection |
-
2016
- 2016-01-29 CN CN201620097083.5U patent/CN205353288U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505550A (en) * | 2017-09-07 | 2017-12-22 | 广州供电局有限公司 | Detection impedance for cable partial discharge detection |
| CN107505550B (en) * | 2017-09-07 | 2019-12-06 | 广州供电局有限公司 | Detection impedance for cable partial discharge detection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160629 Termination date: 20170129 |