CN203101575U - Short-circuit fault line selection device for borehole cable - Google Patents
Short-circuit fault line selection device for borehole cable Download PDFInfo
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- CN203101575U CN203101575U CN 201320115424 CN201320115424U CN203101575U CN 203101575 U CN203101575 U CN 203101575U CN 201320115424 CN201320115424 CN 201320115424 CN 201320115424 U CN201320115424 U CN 201320115424U CN 203101575 U CN203101575 U CN 203101575U
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Abstract
The utility model discloses a short-circuit fault line selection device for a borehole cable. The short-circuit fault line selection device comprises a current signal generating circuit module, a plurality of current transformers, a plurality of signal conditioning circuit modules and a data processing display circuit module, wherein the current signal generating circuit module is composed of a sinusoidal signal generator and a voltage transformer; the current transformers are sleeved on a grounding wire of an outgoing cable; each single conditioning circuit module is composed of a lowpass filtering circuit module, a twin-T network wave trap module and an amplifying circuit module, which are connected in sequence; and the data processing display circuit module comprises an A/D (Analog/Digital) switching circuit module, a microprocessor module, a communication circuit module and an upper computer, which are connected in sequence. The short-circuit fault line selection device is simple in structure, reasonable in design, convenient to implement, low in cost, high in working reliability, strong in practicability and convenient to popularize and use, can be used for carrying out line selection on a short-circuit fault when a cable line operates and timely and accurately discovering a fault line and has a good use effect.
Description
Technical field
The utility model relates to cable fault diagnostic techniques field, especially relates to a kind of borehole cable short trouble line selection apparatus.
Background technology
No matter be that the electric arc that produces of the fault of cable own or cable external environment condition are caught fire and all can directly be caused ignition of cable, directly jeopardize underground operators safety for colliery its consequence of this special industry.The fault of cable own descends for insulation after all, and is aging so that destroy.Cable is through long-time running, or running overload and can not in time excise under the short-circuit current situation at protective device, is in long-term heating status and can causes its decreasing insulating, and long duration of action finally can cause the short-circuit fire of cable and have serious consequences.It is necessary being directed to the downhole cable insulation effective online line selection apparatus of short trouble design that causes that descends.
What downhole cable supply line still adopted at present is the insulation detection device of additional dc power supply, this device can only the detection streamer circuit the insulation against ground changes in resistance, for cable line, capacity effect is its outstanding behaviours, the additional dc power supply insulation detection device can not reflect the dielectric level of cable line under exchange status comprehensively, and its fault current was a capacitive when cable line was short-circuited fault, so the additional dc power supply insulation detection device can not be realized failure line selection.Can't use this equipment in time to determine faulty line when secondly, the Insulation Resistance Tester that uses in the prophylactic repair of down-hole for cable line at present causes cable to be in operation being short-circuited fault as offline inspection.In sum, at operating borehole cable, be badly in need of the borehole cable short trouble line selection apparatus that design realizes a kind of practicality.
The utility model content
Technical problem to be solved in the utility model is at above-mentioned deficiency of the prior art, a kind of borehole cable short trouble line selection apparatus is provided, it is simple in structure, reasonable in design, realization is convenient and cost is low, the functional reliability height, discovery faulty line that can be promptly and accurately, practical, result of use is good, is convenient to promote the use of.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of borehole cable short trouble line selection apparatus, it is characterized in that: comprise being used to the current signal generative circuit module that produces the 25Hz sinusoidal current signal and inject the short trouble phase and being respectively applied for a plurality of current transformers that obtain the electric current of flowing through on the many outlet cable grounding lines, and corresponding respectively and a plurality of signal conditioning circuit modules that a plurality of current transformers join and the data processing display circuit module of all joining with a plurality of signal conditioning circuit modules; Described current signal generative circuit module is made of sinusoidal signal generator and voltage transformer (VT), the connection terminal A of described voltage transformer (VT) first siding ring, connection terminal B and connection terminal C are all by resistance R ground connection, and A phase line corresponding respectively and bus, B phase line and C phase line are joined, the connection terminal a of described voltage transformer secondary side coil, connection terminal b and connection terminal c be connected into star-like after respectively with the output channel A of sinusoidal signal generator, output channel B is connected with output channel C, the neutral point n of described voltage transformer secondary side coil is connected with the zero line side N of sinusoidal signal generator, described current transformer is sleeved on the outlet cable grounding line, and described signal conditioning circuit module is by joining successively and being used for low-pass filter circuit module with the AC signal filtering more than the 100Hz, be used for the twin-T network notch circuit module of 50Hz power frequency component filtering and the amplifying circuit module that is used for signal is amplified are constituted; Described data processing display circuit module comprises A/D change-over circuit module of joining with the amplifying circuit module and the microprocessor module that joins with A/D change-over circuit module, and communication circuit module that joins with microprocessor module and the host computer that joins with communication circuit module.
Above-mentioned a kind of borehole cable short trouble line selection apparatus, it is characterized in that: described current transformer is an open-close type current transformer.
Above-mentioned a kind of borehole cable short trouble line selection apparatus, it is characterized in that: described microprocessor module is the DSP digital signal processor, described A/D change-over circuit module is integrated in described DSP digital signal processor inside.
Above-mentioned a kind of borehole cable short trouble line selection apparatus, it is characterized in that: described DSP digital signal processor is a chip TMS 320 F 2812.
Above-mentioned a kind of borehole cable short trouble line selection apparatus is characterized in that: described communication circuit module is serial communication circuit module or USB interface communication circuit module.
The utility model compared with prior art has the following advantages:
1, the utility model is to design at the special method of operation in down-hole, satisfies the security requirement that use the down-hole, has adopted modular design, made full use of the intrinsic ground line configuration of outlet cable itself simultaneously, simple in structure, reasonable in design, realization is convenient and cost is low.
2, the utility model has adopted open-close type current transformer to obtain the cable grounding electric current, open-close type current transformer is directly exported the voltage signal of 0.333V～3.53V, through can be directly behind the signal condition as the input signal of microprocessor module, saved the sampling resistor link, and when using, only need two semicircular ring with current transformer be stuck on the outlet cable grounding line and get final product, easy for installation, the measurement cost is low.
3, the utility model adopts twin-T network notch circuit module to finish the filtering of 50Hz power frequency component, and circuit structure is simple and easy to realize.
4, the utility model microprocessor module has adopted the DSP digital signal processor, has realized the signal Processing of failure line selection function, has given full play to the digital operating ability of DSP digital signal processor, and the functional reliability height.
5, since in the reality faulty line and non-fault line ground wire size of current differ obvious, therefore, accuracy requirement to A/D change-over circuit module is not high, the utility model adopts the A/D change-over circuit module that is integrated in DSP digital signal processor inside to carry out analog to digital conversion, circuit structure is simple, the realization cost is low, satisfies accuracy requirement.
6, the utility model can correctly reflect the dielectric level of cable line under exchange status, can carry out route selection at the short trouble that cable line in service takes place, discovery faulty line that can be is promptly and accurately handled faulty line and is avoided a nearly step of accident to enlarge thereby cooperate with topworks.
7, of the present utility model practical, result of use is good, is convenient to promote the use of.
In sum, the utility model is simple in structure, and is reasonable in design, realize convenient and cost low, the functional reliability height, discovery faulty line that can be promptly and accurately, practical, result of use is good, is convenient to promote the use of.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present utility model.
Description of reference numerals:
The 1-1-sinusoidal signal generator; The 1-2-voltage transformer (VT); The 2-current transformer;
3-1-low-pass filter circuit module; 3-2-twin-T network notch circuit module;
3-3-amplifying circuit module; 4-1-A/D change-over circuit module;
The 4-2-microprocessor module; The 4-3-communication circuit module; The 4-4-host computer;
The 5-three-phase alternating-current supply; The 6-load.
Embodiment
As shown in Figure 1, the utility model comprises and is used to the current signal generative circuit module that produces the 25Hz sinusoidal current signal and inject the short trouble phase and is respectively applied for a plurality of current transformers 2 that obtain the electric current of flowing through on the many outlet cable grounding lines, and corresponding respectively and a plurality of signal conditioning circuit modules that a plurality of current transformers 2 join and the data processing display circuit module of all joining with a plurality of signal conditioning circuit modules; Described current signal generative circuit module is made of sinusoidal signal generator 1-1 and voltage transformer (VT) 1-2, the connection terminal A of described voltage transformer (VT) 1-2 first siding ring, connection terminal B and connection terminal C are all by resistance R ground connection, and A phase line corresponding respectively and bus, B phase line and C phase line are joined, the connection terminal a of described voltage transformer (VT) 1-2 second siding ring, connection terminal b and connection terminal c be connected into star-like after respectively with the output channel A of sinusoidal signal generator 1-1, output channel B is connected with output channel C, the neutral point n of described voltage transformer (VT) 1-2 second siding ring is connected with the zero line side N of sinusoidal signal generator 1-1, described current transformer 2 is sleeved on the outlet cable grounding line, and described signal conditioning circuit module is by joining successively and being used for low-pass filter circuit module 3-1 with the AC signal filtering more than the 100Hz, be used for the twin-T network notch circuit module 3-2 of 50Hz power frequency component filtering and the amplifying circuit module 3-3 that is used for signal is amplified are constituted; Described data processing display circuit module comprises A/D change-over circuit module 4-1 that joins with amplifying circuit module 3-3 and the microprocessor module 4-2 that joins with A/D change-over circuit module 4-1, and communication circuit module 4-3 that joins with microprocessor module 4-2 and the host computer 4-4 that joins with communication circuit module 4-3.
Wherein, the connection terminal A of described voltage transformer (VT) 1-2 first siding ring, connection terminal B and connection terminal C are all by resistance R ground connection, and the method for operation of non-effective earthing is adopted in the down-hole of following regulation in " safety regulations in coal mine ".
In the present embodiment, described current transformer 2 is an open-close type current transformer, directly export the voltage signal of 0.333V～3.53V, through can be directly behind the signal condition as the input signal of microprocessor module 4-2, saved the sampling resistor link, and when using, only needed two semicircular ring with current transformer 2 be stuck on the outlet cable grounding line and get final product, easy for installation, it is low to measure cost.Described microprocessor module 4-2 is the DSP digital signal processor, and described A/D change-over circuit module 4-1 is integrated in described DSP digital signal processor inside.Described DSP digital signal processor is a chip TMS 320 F 2812.Described communication circuit module 4-3 is serial communication circuit module or USB interface communication circuit module.
As shown in Figure 1, in the present embodiment, the quantity of described outlet cable is two and is respectively cable L1 and cable L2; The output terminal of bus and three-phase alternating-current supply 5 joins, and the output terminal of the output terminal of cable L1 and cable L2 all is connected to load 6.
The utility model is the line selection apparatus of the single-phase earthing fault that causes because of insulation ag(e)ing at borehole cable, is to realize the route selection function under the prerequisite of clear failure phase.The principle of work of the present utility model and the course of work are: sinusoidal signal generator 1-1 fixedly sends the sinusoidal current signal that frequency is 25Hz, utilize the voltage transformer (VT) 1-2 at bus place to inject the sinusoidal current signal of 25Hz mutually to short trouble, the current sample output voltage signal of flowing through on 2 pairs of each bar outlet cable grounding lines of current transformer of suit on each bar outlet cable grounding line, at first pass through the above harmonic signal of low-pass filter circuit module 3-1 filtering 100Hz, then through twin-T network notch circuit module 3-2 filtering 50Hz power frequency component, at this moment, the sine voltage signal that only comprises 25Hz in the remaining signal, be transferred to A/D change-over circuit module 4-1 after through amplifying circuit module 3-3 the 25Hz sinusoidal current signal of injecting being amplified then, microprocessor module 4-2 gathers the signal of a plurality of signal conditioning circuit module outputs by A/D change-over circuit module 4-1, and the signal amplitude size that each signal conditioning circuit module is exported compares, the outlet cable of the big person's correspondence of amplitude is faulty line, realized the route selection function, microprocessor module 4-2 is uploaded to host computer 4-4 with the route selection result by communication circuit module 4-3, and host computer 4-4 shows the route selection result.
The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; everyly any simple modification that above embodiment did, change and equivalent structure are changed, all still belong in the protection domain of technical solutions of the utility model according to the utility model technical spirit.
Claims (5)
1. borehole cable short trouble line selection apparatus, it is characterized in that: comprise being used to the current signal generative circuit module that produces the 25Hz sinusoidal current signal and inject the short trouble phase and being respectively applied for a plurality of current transformers (2) that obtain the electric current of flowing through on the many outlet cable grounding lines, and corresponding respectively and a plurality of signal conditioning circuit modules that a plurality of current transformers (2) join and the data processing display circuit module of all joining with a plurality of signal conditioning circuit modules; Described current signal generative circuit module is made of sinusoidal signal generator (1-1) and voltage transformer (VT) (1-2), the connection terminal A of described voltage transformer (VT) (1-2) first siding ring, connection terminal B and connection terminal C are all by resistance R ground connection, and A phase line corresponding respectively and bus, B phase line and C phase line are joined, the connection terminal a of described voltage transformer (VT) (1-2) second siding ring, connection terminal b and connection terminal c be connected into star-like after respectively with the output channel A of sinusoidal signal generator (1-1), output channel B is connected with output channel C, the neutral point n of described voltage transformer (VT) (1-2) second siding ring is connected with the zero line side N of sinusoidal signal generator (1-1), described current transformer (2) is sleeved on the outlet cable grounding line, and described signal conditioning circuit module is by joining successively and being used for low-pass filter circuit module (3-1) with the AC signal filtering more than the 100Hz, be used for the twin-T network notch circuit module (3-2) of 50Hz power frequency component filtering and the amplifying circuit module (3-3) that is used for signal is amplified are constituted; Described data processing display circuit module comprises A/D change-over circuit module (4-1) of joining with amplifying circuit module (3-3) and the microprocessor module (4-2) that joins with A/D change-over circuit module (4-1), and communication circuit module (4-3) that joins with microprocessor module (4-2) and the host computer (4-4) that joins with communication circuit module (4-3).
2. according to the described a kind of borehole cable short trouble line selection apparatus of claim 1, it is characterized in that: described current transformer (2) is an open-close type current transformer.
3. according to the described a kind of borehole cable short trouble line selection apparatus of claim 1, it is characterized in that: described microprocessor module (4-2) is the DSP digital signal processor, and described A/D change-over circuit module (4-1) is integrated in described DSP digital signal processor inside.
4. according to the described a kind of borehole cable short trouble line selection apparatus of claim 3, it is characterized in that: described DSP digital signal processor is a chip TMS 320 F 2812.
5. according to the described a kind of borehole cable short trouble line selection apparatus of claim 1, it is characterized in that: described communication circuit module (4-3) is serial communication circuit module or USB interface communication circuit module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320115424 CN203101575U (en) | 2013-03-14 | 2013-03-14 | Short-circuit fault line selection device for borehole cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320115424 CN203101575U (en) | 2013-03-14 | 2013-03-14 | Short-circuit fault line selection device for borehole cable |
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| Publication Number | Publication Date |
|---|---|
| CN203101575U true CN203101575U (en) | 2013-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320115424 Expired - Fee Related CN203101575U (en) | 2013-03-14 | 2013-03-14 | Short-circuit fault line selection device for borehole cable |
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| Country | Link |
|---|---|
| CN (1) | CN203101575U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777388A (en) * | 2015-04-27 | 2015-07-15 | 山东达顺电子科技有限公司 | Method for recognizing power supply branch circuit users through zero sequence current sampling method |
| CN109142984A (en) * | 2018-09-30 | 2019-01-04 | 国网四川省电力公司电力科学研究院 | A kind of High frequency injection signals frequency selecting method and device |
-
2013
- 2013-03-14 CN CN 201320115424 patent/CN203101575U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777388A (en) * | 2015-04-27 | 2015-07-15 | 山东达顺电子科技有限公司 | Method for recognizing power supply branch circuit users through zero sequence current sampling method |
| CN109142984A (en) * | 2018-09-30 | 2019-01-04 | 国网四川省电力公司电力科学研究院 | A kind of High frequency injection signals frequency selecting method and device |
| CN109142984B (en) * | 2018-09-30 | 2020-12-22 | 国网四川省电力公司电力科学研究院 | High-frequency injection signal frequency selection method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130731 Termination date: 20140314 |