CN111224249A - Telescopic discharging rod using negative temperature coefficient thermistor - Google Patents
Telescopic discharging rod using negative temperature coefficient thermistor Download PDFInfo
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- CN111224249A CN111224249A CN202010020982.6A CN202010020982A CN111224249A CN 111224249 A CN111224249 A CN 111224249A CN 202010020982 A CN202010020982 A CN 202010020982A CN 111224249 A CN111224249 A CN 111224249A
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- 238000007599 discharging Methods 0.000 title abstract description 25
- 239000004020 conductor Substances 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 241000270722 Crocodylidae Species 0.000 claims description 2
- LNNWVNGFPYWNQE-GMIGKAJZSA-N desomorphine Chemical compound C1C2=CC=C(O)C3=C2[C@]24CCN(C)[C@H]1[C@@H]2CCC[C@@H]4O3 LNNWVNGFPYWNQE-GMIGKAJZSA-N 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 21
- 238000010586 diagram Methods 0.000 description 6
- 238000004804 winding Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000000523 sample Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 241000270728 Alligator Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/11—End pieces or tapping pieces for wires, supported by the wire and for facilitating electrical connection to some other wire, terminal or conductive member
- H01R11/12—End pieces terminating in an eye, hook, or fork
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/04—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient
- H01C7/042—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient mainly consisting of inorganic non-metallic substances
- H01C7/043—Oxides or oxidic compounds
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/6608—Structural association with built-in electrical component with built-in single component
- H01R13/6616—Structural association with built-in electrical component with built-in single component with resistor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
Abstract
A telescopic discharge rod using negative temperature coefficient thermistor comprises: the contact metal hook, the first section of insulating rod body (containing an NTC thermistor), the grounding wire, the rubber antiskid insulating handle and the four sections of insulating rod bodies. The NTC thermistor is connected in series to serve as a discharge conductor, the inherent characteristics that the NTC thermistor is high in resistance value when the temperature is low and low in resistance value when the temperature is high are utilized, and the discharge rod adopting the NTC thermistor as the discharge conductor can accelerate the discharge speed of the capacitive equipment. Compared with the existing discharging rod, the discharging rod has the advantages of high discharging speed and long service life of the resistor, and can improve the feasibility and the working efficiency of engineering application on the premise of ensuring the personal safety of operating personnel.
Description
Technical Field
The invention relates to an electric detection device, in particular to a telescopic discharge rod adopting a negative temperature coefficient thermistor.
Technical Field
In an electric power system, capacitive devices such as capacitors and capacitive transformers are widely used. These capacitive devices store charge during use, and when the devices are overhauled, a discharge rod is needed to discharge residual charge stored therein to ensure the safety of personnel and equipment.
At present, various types of discharge rods exist at home and abroad, for example, a single-resistor single-hook discharge rod adopts a single winding resistor with fixed resistance and thermal capacity to discharge capacitive equipment, and the volume of the discharge rod is limited, so that the winding resistor placed in the discharge rod cannot be too large, the thermal capacity of the resistor is limited, a resistor with larger resistance is needed, and the discharge time of the capacitive equipment, particularly a capacitor, is longer; multi-resistance multi-hook discharge rods-such discharge rods require an operator to manually change the hook position based on the release of residual charge from the capacitive device during use. The discharge speed of the discharge rod is superior to that of a single-resistor single-hook discharge rod, but the discharge rod is complex in structure, heavy and not easy to carry, and the reliability is not high when multiple hooks are connected.
In order to solve the above technical problems, it is a research direction of those skilled in the art to find a discharge rod with fast discharge speed, simple structure and light weight.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a telescopic discharge rod adopting a negative temperature coefficient thermistor. The discharge rod adopts a Negative Temperature Coefficient (NTC) thermistor as a discharge conductor.
The NTC thermistor is manufactured by using metal oxides of manganese, cobalt, nickel, copper and the like as main materials and adopting a ceramic process. These metal oxide materials all have semiconductor properties and are completely similar to semiconductor materials such as germanium, silicon, etc. in conduction. When the NTC thermistor is at low temperature, the number of current carriers (electrons and holes) of an oxide material is small, and the NTC thermistor shows the property of higher resistance value; as the temperature increases, the number of carriers increases and the resistance value decreases. The NTC thermistor also has the characteristics of long service life, high precision, high sensitivity, high reliability and the like, and can still normally and stably work in various ultrahigh-temperature and high-pressure environments.
The discharge conductor in the existing discharge rod adopts a wound resistor, the resistance value of the wound resistor changes little in the discharge process, and when the discharge voltage is gradually reduced in the discharge process, the current is smaller and smaller, so that the discharge time lasts for a long time. When the NTC thermistor is applied to a discharging rod, because the resistance value is not fixed but gradually changes along with the temperature, when current flows through the NTC thermistor, the NTC thermistor generates heat, and because of a negative temperature coefficient, the resistance value is reduced, so that even if the voltage on a capacitor is gradually reduced due to discharging, the discharging current (namely the current flowing through the NTC thermistor) can still keep a larger value, and the discharging speed is accelerated. Compared with the existing discharging rod, the discharging rod has the advantages of high discharging speed, long service life of the resistor and the like, and can improve the feasibility and the working efficiency of engineering application on the premise of ensuring the personal safety of operating personnel.
In order to achieve the above object, the technical solution of the present invention is as follows:
a telescopic discharge rod with a negative temperature coefficient thermistor is characterized by comprising a contact metal hook, a first section of insulating rod body, a grounding wire, four sections of insulating rod bodies and a rubber anti-skid insulating handle, wherein the negative temperature coefficient thermistor is used as a discharge conductor and is arranged in the first section of insulating rod body, one end of the resistor is connected with the contact metal hook, the other grounding end of the resistor is connected with the grounding wire, and the grounding wire comprises a strong metal crocodile clip and is used for grounding; the other end of the first section of insulating rod body is connected with one end of the four sections of insulating rod bodies, and the rubber anti-skid insulating handle is sleeved at the handheld position of the other end of the four sections of insulating rod bodies; the four sections of insulating rod bodies can be stretched and shortened, and are convenient to carry and use.
The maximum length of the insulating rod after stretching is 1.25m, and the whole length of the discharge rod is more than 1.5 m.
The grounding wire adopts a plurality of strands of annealed copper wires with sheaths, and the cross section of the annealed copper wires is 25mm2。
The NTC thermistor has the characteristics of high temperature, reduced resistance and low temperature, and increased resistance.
Compared with the prior art, the invention has the following beneficial effects:
compared with the existing discharge rod which takes a wound resistor as a discharge conductor, the telescopic discharge rod adopting the NTC thermistor maintains the advantages of the existing discharge rod, and simultaneously utilizes the inherent characteristics of high resistance when the NTC thermistor is low in temperature and low resistance when the NTC thermistor is high in temperature, when the telescopic discharge rod is applied to the discharge rod, when current flows through the NTC thermistor, the NTC thermistor generates heat and reduces the resistance, so that even if the voltage on capacitive equipment such as a capacitor, a capacitive mutual inductor and the like is gradually reduced due to discharge, the discharge current (namely the current flowing through the NTC thermistor) can still keep a larger value, and the discharge speed is accelerated. The resistor has the characteristics of long service life, high precision, high sensitivity, high reliability and the like, and the operation safety and the working efficiency of operation and maintenance operators are effectively improved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a telescopic discharge rod using a negative temperature coefficient thermistor according to the present invention.
Fig. 2 is a temperature-resistance curve diagram of a certain type of NTC thermistor.
Fig. 3 is a schematic diagram of the test.
Fig. 4 is a discharge waveform of a telescopic type discharging rod using an NTC thermistor in an example of the present invention.
Fig. 5 is a discharge bar discharge waveform using a wire wound resistor.
Detailed Description
The invention is further illustrated with reference to the following figures and examples, which should not be construed as limiting the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a telescopic discharging rod using an NTC thermistor according to an embodiment of the present invention. As shown in fig. 1, the telescopic discharge rod using a negative temperature coefficient thermistor of the present invention includes a contact metal hook 1, a first section of insulating rod 2, a ground wire 3, a four section of insulating rod 5 and a rubber anti-slip insulating handle 4, the negative temperature coefficient thermistor is used as a discharge conductor and is placed in the first section of insulating rod 2, one end of the resistor is connected with the contact metal hook 1, the other ground terminal of the resistor is connected with the ground wire 3, and the ground wire 3 includes a strong metal alligator clip for grounding; the other end of the first section of insulating rod body 2 is connected with one end of the four sections of insulating rod bodies 5, and the rubber anti-skid insulating handle 4 is sleeved at the handheld position of the other end of the four sections of insulating rod bodies 5; the four-section insulating rod body 5 can be stretched and shortened, and is convenient to carry and use.
The maximum length of the insulating rod after stretching is 1.25m, and the whole length of the discharge rod is more than 1.5 m.
The grounding wire adopts a plurality of strands of annealed copper wires with sheaths, and the cross section of the annealed copper wires is 25mm2。
As shown in fig. 2, fig. 2 is a graph of the temperature-resistance value of a certain type of NTC thermistor, and a general mathematical expression of the relationship between the NTC thermistor temperature is as follows:
wherein R isTThe resistance value of the NTC thermistor at the temperature of T,
At a temperature of T0The resistance value of the time NTC thermistor; b isNIs the material constant of the NTC thermistor.
Fig. 3 is a schematic diagram of the testing of the telescopic discharging rod using the NTC thermistor according to the present invention. As shown in fig. 3, the schematic diagram of the test of the telescopic discharging rod using the ntc thermistor in this embodiment includes: the high-voltage measuring device comprises a high-voltage power supply module 11, a main capacitor 12, a current-limiting resistor 13, a high-voltage switch 14, a selector switch 15, a wound resistor 16, an NTC thermistor 17, a contact 19 connected with the wound resistor 16, a contact 18 connected with the NTC thermistor 17, a high-voltage probe measuring position point a for measuring voltage waveforms at two ends of the wound resistor 16 and a high-voltage probe measuring position point b for measuring voltage waveforms at two ends of the NTC thermistor 17.
Test conditions 1:
the high-voltage power supply module 11, the main capacitor 12, the current-limiting resistor 13 and the high-voltage switch 14 are connected in series; after the high-voltage switch 14 is closed, the main capacitor 12 is charged through the high-voltage power supply module 11. After the main capacitor 12 is charged to the required voltage, the high-voltage switch 14 is opened, the switch 15 is connected with the contact 18, and the main capacitor 12 discharges the NTC thermistor 17. The oscilloscope (high voltage probe) is placed at the position of the b point to measure the voltage waveform of the NTC thermistor 17.
The charging voltage of the capacitor is 3kV, the capacity of the capacitor is 9uF, the NTC thermistor with the initial resistance value of 600k omega is used for discharging the capacitor, the voltage waveforms at the two ends of the NTC thermistor are measured as shown in figure 4, and the discharging time required when the voltage is reduced to be near 0V is about 7 seconds;
test condition 2:
the high-voltage power supply module 11, the main capacitor 12, the current-limiting resistor 13 and the high-voltage switch 14 are connected in series; after the high-voltage switch 14 is closed, the main capacitor 12 is charged through the high-voltage power supply module 11. After the main capacitor 12 is charged to the required voltage, the high-voltage switch 14 is turned on, the switch 15 is connected with the contact 19, and the main capacitor 12 discharges the winding type resistor 16. The oscilloscope (high voltage probe) is placed at the position of a point to measure the voltage waveform of the wound resistor 16.
The capacitor charging voltage is 3kV, the capacitor capacity is 9uF, the winding resistor with the initial resistance value of 600k omega is used for discharging the capacitor, the voltage waveform at two ends of the winding resistor is measured as shown in figure 5, and the discharging time required for the voltage to be reduced to be close to 0V is about 29 seconds.
Experiments show that under the same resistance value, the same capacity and the same charging voltage, the discharge speed of the telescopic discharge rod adopting the NTC thermistor is obviously higher than that of the discharge rod adopting the wound resistor.
The most remarkable characteristics of the invention are as follows: compared with a winding type resistor, the NTC thermistor has the inherent characteristics of high resistance at low temperature and low resistance at high temperature.
The NTC thermistor is used as a discharging rod of the discharging conductor, when in use, current flows through the NTC thermistor, the NTC thermistor generates heat, the resistance value of the NTC thermistor is reduced, and therefore even if the voltage of capacitive equipment such as a capacitor, a capacitor mutual inductor and the like is gradually reduced due to discharging, the discharging current (namely the current flowing through the NTC thermistor) can still keep a larger value, and the discharging speed can be accelerated. The NTC thermistor also has the characteristics of long service life, high precision, high sensitivity, high reliability and the like, and the discharge rod adopting the NTC thermistor as a discharge conductor can effectively improve the operation safety and the working efficiency of operation and maintenance operators.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. A telescopic type discharge rod with a negative temperature coefficient thermistor is characterized by comprising a contact metal hook (1), a first section of insulating rod body (2), a grounding wire (3), a four section of insulating rod body (5) and a rubber anti-skid insulating handle (4), wherein the negative temperature coefficient thermistor is used as a discharge conductor and is arranged in the first section of insulating rod body (2), one end of the resistor is connected with the contact metal hook (1), the other grounding end of the resistor is connected with the grounding wire (3), and the grounding wire (3) comprises a strong metal crocodile clip and is used for grounding; the other end of the first section of insulating rod body (2) is connected with one end of the four sections of insulating rod bodies (5), and the rubber antiskid insulating handle (4) is sleeved at the handheld position of the other end of the four sections of insulating rod bodies (5); the four-section insulating rod body 5 can be stretched and shortened, and is convenient to carry and use.
2. The telescopic discharge rod of claim 1, wherein the maximum length of the insulating rod after stretching is 1.25m, and the overall length of the discharge rod is greater than 1.5 m.
3. The telescopic discharge rod of claim 1, wherein the ground wire is a sheathed copper cord with a cross-section of 25mm2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010020982.6A CN111224249A (en) | 2020-01-09 | 2020-01-09 | Telescopic discharging rod using negative temperature coefficient thermistor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010020982.6A CN111224249A (en) | 2020-01-09 | 2020-01-09 | Telescopic discharging rod using negative temperature coefficient thermistor |
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| CN111224249A true CN111224249A (en) | 2020-06-02 |
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| CN202010020982.6A Pending CN111224249A (en) | 2020-01-09 | 2020-01-09 | Telescopic discharging rod using negative temperature coefficient thermistor |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3828702A1 (en) * | 1988-08-24 | 1990-03-01 | Stumpmeier Fritz | Luminaire having a plurality of light sources of low-voltage halogen lamps and an AC power controller |
| CN2750620Y (en) * | 2004-12-15 | 2006-01-04 | 王超英 | Discharging rod |
| CN101394079A (en) * | 2007-09-21 | 2009-03-25 | 苏州三星电子有限公司 | Novel frequency conversion power source protecting device |
| CN103267934A (en) * | 2013-05-08 | 2013-08-28 | 国家电网公司 | Portable direct current test discharging rod |
| CN103560004A (en) * | 2013-10-29 | 2014-02-05 | 国家电网公司 | Special discharging rod for capacitor |
| CN104538757A (en) * | 2015-01-12 | 2015-04-22 | 国网福建南安市供电有限公司 | Integrated discharging rod of capacitor |
| CN205523742U (en) * | 2016-02-03 | 2016-08-31 | 惠州市蓝微新源技术有限公司 | Electric automobile soft start circuit system based on negative temperature coefficient thermistor |
| CN206223315U (en) * | 2016-11-28 | 2017-06-06 | 河南力安测控科技有限公司 | A kind of temperature transducer of low-power consumption |
| CN207947450U (en) * | 2018-03-27 | 2018-10-09 | 国网技术学院 | A kind of training discharging rod of improved belt safety precaution function |
-
2020
- 2020-01-09 CN CN202010020982.6A patent/CN111224249A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3828702A1 (en) * | 1988-08-24 | 1990-03-01 | Stumpmeier Fritz | Luminaire having a plurality of light sources of low-voltage halogen lamps and an AC power controller |
| CN2750620Y (en) * | 2004-12-15 | 2006-01-04 | 王超英 | Discharging rod |
| CN101394079A (en) * | 2007-09-21 | 2009-03-25 | 苏州三星电子有限公司 | Novel frequency conversion power source protecting device |
| CN103267934A (en) * | 2013-05-08 | 2013-08-28 | 国家电网公司 | Portable direct current test discharging rod |
| CN103560004A (en) * | 2013-10-29 | 2014-02-05 | 国家电网公司 | Special discharging rod for capacitor |
| CN104538757A (en) * | 2015-01-12 | 2015-04-22 | 国网福建南安市供电有限公司 | Integrated discharging rod of capacitor |
| CN205523742U (en) * | 2016-02-03 | 2016-08-31 | 惠州市蓝微新源技术有限公司 | Electric automobile soft start circuit system based on negative temperature coefficient thermistor |
| CN206223315U (en) * | 2016-11-28 | 2017-06-06 | 河南力安测控科技有限公司 | A kind of temperature transducer of low-power consumption |
| CN207947450U (en) * | 2018-03-27 | 2018-10-09 | 国网技术学院 | A kind of training discharging rod of improved belt safety precaution function |
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Effective date of registration: 20210907 Address after: 200030 No. 1954, Huashan Road, Shanghai, Xuhui District Applicant after: SHANGHAI JIAO TONG University Applicant after: China South Power Grid International Co.,Ltd. Address before: 200240 No. 800, Dongchuan Road, Shanghai, Minhang District Applicant before: SHANGHAI JIAO TONG University Applicant before: POWER GRID TECHNOLOGY RESEARCH CENTER. CHINA SOUTHERN POWER GRID |
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Application publication date: 20200602 |