CN216485322U - Power cable fault burn-through position finder - Google Patents
Power cable fault burn-through position finder Download PDFInfo
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- CN216485322U CN216485322U CN202122636257.4U CN202122636257U CN216485322U CN 216485322 U CN216485322 U CN 216485322U CN 202122636257 U CN202122636257 U CN 202122636257U CN 216485322 U CN216485322 U CN 216485322U
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Abstract
The utility model discloses a power cable fault burn-through locator, and relates to the technical field of power cable fault detection and fault location. The intelligent power supply control circuit comprises an alternating current power supply input device and a lithium battery pack, wherein one end of the lithium battery pack and one end of the alternating current power supply input device are both connected with power supply protectors, and an intelligent power supply control circuit is connected between the end parts of the two power supply protectors. According to the utility model, the intelligent switch high-voltage constant current source is adopted through the power cable fault burn-through function and the position finder burn-through function, the intelligent switch high-voltage constant current source is output through n-time voltage rectification, the pure electronic mode is adopted for processing, the output voltage is high and 60kV at most, the current is stable and high in reliability, the voltage is continuously adjustable, the operation process is simple and reliable, the power cable fault burn-through function and the position finder bridge function adopt the unbalanced bridge mode, the mode can avoid complex balance adjustment operation, the distance measurement is automatically completed through the carrier communication mode with the far-end junction box, and excessive manual operation is not needed.
Description
Technical Field
The utility model belongs to the technical field of power cable fault detection and fault positioning, and particularly relates to a power cable fault burn-through locator.
Background
In recent years, with the reconstruction and construction of national urban and rural power grids, more and more power cables are put into a power system to operate. Due to cable engineering construction, accessory installation and external force damage, various types of cables, complex laying environment, strong concealment, high cable fault rate caused by fault type difference and the like, the operation and maintenance cost of power supply enterprises and the power supply reliability of a power grid are seriously influenced. Therefore, how to accurately and quickly locate the cable fault becomes a hot issue of current interest.
According to the structural component classification of cables, we classify the cables into two main categories: conductor failure and insulation failure:
conductor faults are various faults occurring in metal conductors in 10kV/110kV cables, and mainly refer to faults of conductor inner cores (such as copper wires and aluminum wires) and metal shielding layers (such as lead skins and copper strips). The insulating layer in a 10kV cable, whether it is a main insulating layer or an additional protective insulating layer (for 110kV and above cables), is one of the core constituents of a 10kV cable, but its material is weaker than the conductor material. Therefore, the faults discovered by daily operation and maintenance are mostly faults caused by the insulating layer, and therefore, the power operation and maintenance personnel often divide the cable short-circuit faults into low-resistance faults, high-resistance faults and flashover faults.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a power cable fault burn-through locator, which solves the technical problem that the existing cable fault testing device is limited when in use.
In order to achieve the purpose, the utility model is realized by the following technical scheme:
a power cable fault burn-through locator comprises an alternating current power supply input device and a lithium battery pack, wherein one end of the lithium battery pack and one end of the alternating current power supply input device are both connected with power supply protectors;
one end of the intelligent switch high-voltage constant current source is connected with a high-voltage output device, and one end of the controller is connected with a liquid crystal screen, a parameter adjusting device, a function switching device and a fault distance measuring device, wherein the function switching device and the fault distance measuring device are positioned on one side of the parameter adjusting device.
Optionally, alternating current power supply input device's one end is connected with high tension cable, and high tension cable includes: cable shielding layer, cable core.
Optionally, one end of the cable core is connected to one end of the ac power input device.
Optionally, one end of the cable shielding layer is connected to a working grounding device connected to one end of the ac power input device.
Optionally, one end of the power input device is connected to an ac power socket, and one end of the ac power socket is connected to a function switch, an output terminal located on one side of the function switch, a power switch, a voltage adjusting knob located on one side of the power switch, a current adjusting knob located on one side of the voltage adjusting knob, and a resistance adjusting knob located on one side of the current adjusting knob.
Optionally, the controller includes: a regulation control loop, an A/D conversion loop and an ARM processor.
The embodiment of the utility model has the following beneficial effects:
according to one embodiment of the utility model, an intelligent switch high-voltage constant current source is adopted through the power cable fault burn-through function and the position finder burn-through function, the power cable fault burn-through function is subjected to n-time voltage rectification output and processed in a pure electronic mode, the output voltage is high, the highest 60kV, the current is stable and high in reliability, the voltage is continuously adjustable, the operation process is simple and reliable, the power cable fault burn-through function and the position finder bridge function adopt an unbalanced bridge mode, the mode can avoid complex balance adjustment operation, the distance measurement is automatically completed through a mode of carrier communication with a far-end junction box, excessive manual operation is not needed, and the power cable fault burn-through function and the position finder can burn through any form of high-resistance grounding faults, such as high-resistance faults caused by cable moisture, water inflow and the like. Especially, the high-voltage bridge method has no test blind area, and is also applicable to faults of short cables and cable ends, after the power cable fault burn-through and the positioning instrument are pre-positioned by using the high-voltage bridge function, 1Hz ultralow frequency pulsating direct current can be output, the frequency of a transmitted signal is low, the influence of system distributed capacitance is avoided, and the accurate positioning is carried out by matching with portable handheld equipment.
Of course, it is not necessary for any product in which the utility model is practiced to achieve all of the above-described advantages at the same time.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a logical block diagram of a power cable fault burn-through and locating apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a power cable fault burn-through and positioning apparatus according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a power cable fault burnthrough and positioning apparatus test connection according to an embodiment of the present invention.
Wherein the figures include the following reference numerals:
alternating current power supply socket 1, device switch 2, power change over switch 3, voltage adjustment knob 4, current adjustment knob 5, resistance adjustment knob 6, output terminal 7, controller 8, power protector 9, intelligent power control return circuit 10, LCD screen 11, parameter adjusting device 12, function switching device 13, fault location device 14, intelligent switch high voltage constant current source 15, high voltage output device 16, high tension cable 17, cable shielding layer 18, cable core 19, work earthing device 20, function change over switch 21.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses.
To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the utility model have been omitted.
Referring to fig. 1 to 3, in the present embodiment, there is provided a power cable fault burn-through locator, including: one end of the AC power input device and the lithium battery pack are connected with a power supply protector 9, an intelligent power supply control loop 10 is connected between the end parts of the two power supply protectors 9, the intelligent power supply control loop 10 is connected with the output end of the power supply protector 9, on one hand, a DC 24V control power supply is provided for a controller 8, on the other hand, a reliable power supply is provided for a high-voltage generator, one end of the intelligent power supply control loop 10 is connected with the controller 8 and an intelligent switch high-voltage constant current source 15 connected with one end of the controller 8, the intelligent switch high-voltage constant current source 15 sends signals by the controller 8, and the instrument outputs high-voltage and constant current signals through a voltage adjusting knob 4 and a current adjusting knob 5 so as to burn through and carbonize a high-resistance fault point of a cable, reduce the resistance of the fault point and facilitate the distance measurement and positioning of the fault point, the purpose of rapidly searching for faults is achieved;
one end of the intelligent switch high-voltage constant current source 15 is connected with a high-voltage output device 16, one end of the controller 8 is connected with a liquid crystal screen 11, a parameter adjusting device 12, a function switching device 13 positioned on one side of the parameter adjusting device 12, a fault distance measuring device 14, a fault distance measuring control loop 14 adopts a high-voltage intelligent bridge mode to position fault distance, the function switching device 13 completes the conversion and control of cable burn-through and fault distance measuring working modes through a function switching switch 21, the parameter adjusting device 12 is connected with an internal circuit of the controller, circuit parameters are adjusted through an adjusting knob, and the voltage, the current, the resistance value and the output waveform output by the control instrument are controlled.
When a high-resistance fault occurs, firstly, a direct-current voltage-withstanding burn-through function is used for burning through a cable fault, the high-resistance fault is converted into a low-resistance fault, the low-resistance fault of the cable is pre-positioned by using an intelligent bridge function, the burn-through function outputs the highest voltage of 60kV and the short-circuit current of 600mA, the high residual voltage cable fault can be quickly burned into low resistance, the maximum current of 600mA of the intelligent bridge is suitable for insulation fault searching and pre-positioning of various cables, and the fault distance measuring precision can be greatly improved by using the high voltage and constant large current. It should be noted that the electric devices referred to in this application may be powered by a storage battery or an external power source.
The power cable fault burns through, the function of burning through of locater adopts intelligence switch high pressure constant current source, through n times of voltage rectification output, pure electronic mode handles, output voltage is high, 60kV the highest, the electric current is stable and the reliability is high, voltage is adjustable in succession, operation process is simple and reliable, power cable fault burns through, the electric bridge function of locater adopts the unbalanced bridge mode, this mode can avoid complicated accent balanced operation, through the mode with distal end terminal box carrier communication, accomplish the range finding automatically, need not too much manual operation, power cable fault burns through, the locater can burn through the high resistance earth fault of any form, high resistance fault that arouses like the cable wets, intake etc.. Especially, the high-voltage bridge method has no test blind area, and is also applicable to faults of short cables and cable ends, after the power cable fault burn-through and the positioning instrument are pre-positioned by using the high-voltage bridge function, 1Hz ultralow frequency pulsating direct current can be output, the frequency of a transmitted signal is low, the influence of system distributed capacitance is avoided, and the accurate positioning is carried out by matching with portable handheld equipment.
As shown in fig. 2, a high-voltage cable 17 is connected to one end of the ac power input device of the present embodiment, and the high-voltage cable 17 includes: the cable comprises a cable shielding layer 18 and a cable core wire 19, wherein one end of the cable core wire 19 is connected with one end of an alternating current power input device, and one end of the cable shielding layer 18 is connected with a working grounding device 20 connected with one end of the alternating current power input device.
As shown in fig. 3, one end of the power input device of the present embodiment is connected to an ac power socket 1, one end of the ac power socket 1 is connected to a function switch 21, an output terminal 7 located on one side of the function switch 21, a power switch 3, a voltage adjusting knob 4 located on one side of the power switch 3, a current adjusting knob 5 located on one side of the voltage adjusting knob 4, a resistance adjusting knob 6 located on one side of the current adjusting knob 5, the output terminal 7 is used for connecting to the measured high and low voltage power cables, switching between high voltage output and fault distance measurement output is completed through the switch 21, the ac power socket 1 is used for connecting to ac 220V commercial power, when the commercial power is available, on one hand, the required power is provided to the burnthrough positioner, on the other hand, the lithium battery installed inside the burnthrough positioner is charged, and the power protector 9 is installed at the power input end, to prevent power supply voltage fluctuations and harmonics from damaging the instrument.
As shown in fig. 1, the controller 8 of the present embodiment includes: the system comprises an adjusting control loop, an A/D conversion loop and an ARM processor, wherein a high-voltage output and ranging output control program is stored in the ARM processor, control output is completed through a function switching device 13, the function switching loop is arranged at the input end of the ARM processor, output of required functions is controlled through a function switching switch, the output end of the ARM processor is connected with a high-voltage output device 16 and a fault ranging device 14, the adjuster controls the output value of the instrument through adjusting parameters such as voltage, current and resistance, and the A/D conversion loop completes digital-to-analog conversion.
In practical application, the cable fault finding is realized by adopting a direct-current high-voltage generator, low-voltage pulse ranging, pulse current ranging and other methods;
the direct-current high-voltage generator adopts a high-frequency voltage doubling circuit, applies a PWM (pulse width modulation) high-frequency pulse width modulation technology, is used for testing high resistance and flashover faults of a power cable according to an electromagnetic compatibility theory, generates direct-current high voltage to enable a fault point of the cable to be broken down and discharged, and is used for low resistance and disconnection fault location of the cable, measurement of the length of the cable, wave speed adjustment of the cable and the like. For high resistance faults, because the resistance of the fault point connected in parallel with the fault point is much larger than the wave impedance of the cable, the impedance mutation of the fault point is not obvious, and the generated pulse reflection is quite weak. Therefore, the low voltage pulse method cannot effectively measure high resistance faults. The pulse current distance measuring instrument adopts a cable fault core wire to be connected with a direct current high voltage generator, the external voltage is gradually increased, when the voltage is increased to a certain value, a fault point is broken down, the voltage is suddenly reduced, the current is increased, the fault belongs to a flashover fault, the fault resistance is very large, and the pulse current method is generally used for measuring in a preventive test.
The above embodiments may be combined with each other.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Claims (6)
1. A power cable fault burn-through locator, comprising: the intelligent power supply control system comprises an alternating current power supply input device and a lithium battery pack, wherein one end of each of the lithium battery pack and the alternating current power supply input device is connected with a power supply protector (9), an intelligent power supply control loop (10) is connected between the end parts of the two power supply protectors (9), one end of the intelligent power supply control loop (10) is connected with a controller (8) and an intelligent switch high-voltage constant current source (15) connected with one end of the controller (8);
one end of the intelligent switch high-voltage constant current source (15) is connected with a high-voltage output device (16), and one end of the controller (8) is connected with a liquid crystal screen (11), a parameter adjusting device (12), a function switching device (13) positioned on one side of the parameter adjusting device (12) and a fault distance measuring device (14).
2. A power cable fault burn-through locator according to claim 1 wherein a high voltage cable (17) is connected to one end of the ac power input means, the high voltage cable (17) comprising: a cable shielding layer (18) and a cable core (19).
3. A power cable fault burn-through locator according to claim 2 wherein one end of the cable core (19) is connected to one end of the ac power input.
4. A power cable fault burn-through locator according to claim 2 wherein one end of the cable shield (18) is connected to a working earth (20) connected to one end of the ac power input.
5. A power cable fault burn-through locator according to claim 1 wherein one end of the power input device is connected to an ac power outlet (1), one end of the ac power outlet (1) is connected to a function switch (21), an output terminal (7) located on one side of the function switch (21), a power switch (3), a voltage adjustment knob (4) located on one side of the power switch (3), a current adjustment knob (5) located on one side of the voltage adjustment knob (4), and a resistance adjustment knob (6) located on one side of the current adjustment knob (5).
6. A power cable fault burn-through locator according to claim 1 wherein the controller (8) comprises: a regulation control loop, an A/D conversion loop and an ARM processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122636257.4U CN216485322U (en) | 2021-11-01 | 2021-11-01 | Power cable fault burn-through position finder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122636257.4U CN216485322U (en) | 2021-11-01 | 2021-11-01 | Power cable fault burn-through position finder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216485322U true CN216485322U (en) | 2022-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122636257.4U Active CN216485322U (en) | 2021-11-01 | 2021-11-01 | Power cable fault burn-through position finder |
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| Country | Link |
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| CN (1) | CN216485322U (en) |
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2021
- 2021-11-01 CN CN202122636257.4U patent/CN216485322U/en active Active
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