CN211785956U - Pocket air switch characteristic detection device - Google Patents
Pocket air switch characteristic detection device Download PDFInfo
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- CN211785956U CN211785956U CN201922229959.3U CN201922229959U CN211785956U CN 211785956 U CN211785956 U CN 211785956U CN 201922229959 U CN201922229959 U CN 201922229959U CN 211785956 U CN211785956 U CN 211785956U
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Abstract
The utility model discloses a pocket-sized air switch characteristic detection device, which comprises an alternating current millivoltmeter, a protective resistor, an active power meter, a pincerlike mutual inductor, a metal snakeskin tube, a spring contact, an infrared optical fiber, a germanium glass optical lens and an electric signal timer; one input end of the alternating-current millivoltmeter is connected with one metal flexible conduit through a protection resistor, and the other input end of the alternating-current millivoltmeter is directly connected with the other metal flexible conduit; the voltage signal end of the active power meter is connected with two signal input ends of the alternating-current millivoltmeter in parallel, and the current signal end is connected with the signal input end of the electric signal timer in series and is connected with the secondary winding of the pincerlike mutual inductor. The head parts of the two metal snakeskin tubes are provided with spring contacts, the center of one metal snakeskin tube is provided with an infrared optical fiber, one end of the infrared optical fiber is connected with the spring contact, and the other end of the infrared optical fiber is connected with a germanium glass optical lens. The utility model discloses the device has that the operation is convenient, light in weight, but electrified detection, detectable arc extinguishing performance, low cost's characteristics.
Description
Technical Field
The utility model relates to an electric power instrument and meter, in particular to pocket type air switch characteristic detection device.
Background
The air switch is one of core elements of a plant power system of a power plant and is a foundation for ensuring normal operation of various auxiliary machines, the voltage level of the plant power system is low, the number of components is large, particularly the air switch rarely detects the technical characteristics of the plant power system, and the detection method is sometimes unscientific and incomplete, so that the air switch is suddenly failed and burnt or trips mistakenly in high-temperature seasons in summer to cause an accident that important auxiliary machines lose power. Although the failure rate of the air switch and the contactor is not high, once the fault is tripped by mistake or the contact is not adhered to the contactor to act, the normal operation of auxiliary equipment can be seriously influenced, and further serious accidents are caused. Therefore, if the equipment capable of carrying out live inspection on the operation condition of the air switch can be developed, the operation condition of the important loop of the air switch and the operation condition of the contactor can be regularly detected, and the operation reliability and the economical efficiency of a power plant unit can be greatly improved.
The trip scheme based on heavy current generator is generally adopted in prior art, however this scheme exists following not enough, at first use inconveniently, the installation of a large amount of distribution of power plant's air switch, and heavy current generator is very heavy, a 1000A's heavy current generator reachs more than 30 kilograms, it is very big inconvenient to bring for the removal detection operation on-the-spot, secondly can't the on-line test, air switch quantity is very many, rely on the short time detection manpower and materials that the unit has a power failure overhauld to be unable to satisfy completely, need have the ability of operation live period on-line detection. Secondly, the arc extinguishing capability of the switch cannot be detected, the tripping time of the switch can be detected through a time relay or a timer in the prior art, but the arc extinguishing capability of the switch cannot be detected, if the arc extinguishing capability of the switch is insufficient, the contact is adhered and cannot be tripped when the switch trips, and serious accidents of the override tripping of a superior power supply are caused.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the purpose is: in order to overcome the defects of the prior art, the utility model provides a pocket-size air switch characteristic detection device, which has the characteristics of convenient operation, light weight, charged detection, detectable arc extinguishing performance and low cost
The technical scheme of the utility model is that:
a pocket-sized air switch characteristic detection device comprises an alternating current millivoltmeter, a protection resistor, an active power meter, a pincer-shaped mutual inductor, a metal snakeskin tube and an electric signal timer;
one signal input end of the alternating-current millivoltmeter is connected with the protection resistor in series and then is connected with one metal flexible pipe, and the other signal input end of the alternating-current millivoltmeter is directly connected with the other metal flexible pipe; the voltage signal end of the active power meter is connected with the two signal input ends of the alternating-current millivoltmeter in parallel; and the current signal end of the active power meter is connected with the signal input end of the electric signal timer in series and is connected with the secondary winding of the pincerlike mutual inductor.
Preferably, the two metal snakeskin tubes and the pincerlike mutual inductor are arranged on the same side of the shell of the miniature air switch characteristic detection device.
Preferably, the head parts of the two metal snakeskin tubes are provided with spring contacts, the central position of one metal snakeskin tube is provided with an axial infrared optical fiber, one end of the infrared optical fiber is connected with the spring contact, and the other end of the infrared optical fiber is connected with the germanium glass optical lens.
Preferably, the power input ends of the alternating-current millivoltmeter, the active power meter and the electric signal timer are connected with the battery.
The utility model has the advantages that:
1. the cost is low, and the price is only about one tenth of the prior art. The utility model discloses a current conventional component such as millivoltmeter, active power meter, signal of telecommunication timer combines special design's detection circuitry, directly utilizes operating current to detect the air switch in the fortune, need not additional current generator to the cost is reduced by a wide margin.
2. Light weight and convenient movement. Because the utility model discloses need not additional current generator, this weight that just makes whole instrument very alleviates, has solved the shortcoming that prior art equipment is heavy, inconvenient removal, and the complete machine only has the universal meter size, has really accomplished pocket type, has greatly made things convenient for on-the-spot detection operation.
3. Can be detected in a charged state. The utility model discloses but utilize and exchange millivoltmeter and active power meter direct detection air switch contact pressure drop, can accurately detect out contact resistance through the calculation of electric current to judge directly perceived whether there is the anomaly in switch operating condition, realized electrified detection, also greatly promoted on-the-spot detection operation efficiency.
4. The infrared temperature measurement can be carried out on the inside of the air switch. Many troubles of air switch begin from inside generating heat, however air switch generally adopts the plastic casing, and coefficient of heat conductivity is little, and inside outside difficult in time discovery of generating heat, general thermal infrared imager can't detect, the utility model discloses an infrared optical fiber of innovative design with the help of the snakeskin pipe that detects, derives the infrared image in switch inner gap, supplies the thermal infrared imager to detect, has solved the inside difficult problem that can't infrared temperature measurement that generates heat of switch.
5. Most detection items of the air switch are covered by simple means, and the hidden trouble of faulty operation of the switch is thoroughly avoided. The utility model discloses a means all come from low-priced conventional electrical components, realized the comprehensive detection of air switch operation health degree with extremely low cost.
Drawings
The invention will be further described with reference to the following drawings and examples:
fig. 1 is a schematic diagram of an embodiment of the miniature air switch characteristic detection device of the present invention.
Fig. 2 is a schematic structural diagram of an embodiment of the miniature air switch characteristic detection device of the present invention.
Detailed Description
As shown in fig. 1, the miniature air switch characteristic detection device according to the embodiment of the present invention includes an ac millivoltmeter 1, a protection resistor 2, an active power meter 3, a pincer-shaped mutual inductor 4, a metal bellows 5, a spring contact 6, an infrared optical fiber 7, a germanium glass optical lens 8, and an electrical signal timer 9; one signal input end of the alternating-current millivoltmeter 1 is connected with the protection resistor 2 in series and then is connected with one metal flexible pipe 5, and the other signal input end of the alternating-current millivoltmeter 1 is connected with the other metal flexible pipe 5; the voltage signal end of the active power meter 3 is connected in parallel with the two signal input ends of the alternating-current millivoltmeter 1; the current signal end of the active power meter 3 is connected in series with the signal input end of the electric signal timer 9 and is connected with the secondary winding of the pincer-shaped mutual inductor 4. Two metal snakeskin tubes 5 and a pincerlike mutual inductor 4 are arranged on the same side of the shell of the miniature air switch characteristic detection device, the heads of the two metal snakeskin tubes 5 are provided with spring contacts 6, an infrared optical fiber 7 is arranged in the middle of one metal snakeskin tube 5, one end of the infrared optical fiber is connected with the spring contacts 6, and the other end of the infrared optical fiber is connected with a germanium glass optical lens 8. The power input ends of the alternating-current millivoltmeter 1 and the active power meter 3 and the electric signal timer 9 are connected with the battery 10. The distribution structure of the components of the pocket-sized air switch characteristic detection apparatus of the present embodiment is shown in fig. 2.
The utility model discloses at first utilize the alternating-current millivoltmeter to detect the contact pressure drop between the switch contact, the digital alternating-current millivoltmeter internal resistance is big, interference immunity is good, can be to the accurate detection of power frequency alternating current signal below 200mV, the utility model discloses a series connection protection resistance 2, the gauge damage that the high pressure of mistake access causes has effectively been avoided, realize the contact pressure drop measurement, general air switch is inside to be equipped with electromagnetic trip coil, this just makes the contact pressure drop also include the inductance part, for accurate calculation contact resistance of contact, just need provide current signal, the utility model discloses utilize opening mutual-inductor 4, detect the return circuit current, when using like this, the return circuit current is measured simultaneously, the contact pressure drop is measured, through the phase place calculation of active power meter 3, contact resistance can accurately be calculated, contact resistance is the characteristic quantity that can represent switch steady state operation condition the most, the utility model discloses utilize the means of electrified detection, realized this function ingeniously. The utility model discloses the pressure drop detects has still adopted metal snakeskin pipe, and the snakeskin pipe can change the shape wantonly, as long as crooked an appropriate shape like this, then the one-hand just can operate, with the help of the spring contact at snakeskin pipe top, inserts the upper and lower wiring pile head of switch cophase one by one, just can detect contact pressure drop and contact resistance sensitively.
And secondly, detecting the synchronism of the tripping time and three phases by utilizing an electric signal timer and a mutual inductor. As long as a larger load is additionally arranged at the subordinate of a tested switch, then the switch is switched on for power transmission, the pincerlike mutual inductor of the utility model is used for detecting a three-phase conductive loop, the electric signal timer can accumulate and calculate the time from the switch-on to the trip-out of the switch, thereby calculating whether the trip-out characteristic is required by the load, if the pincerlike mutual inductor of the utility model is used for clamping three phases simultaneously, the timer can not detect the trip-out time of the switch because the three-phase current magnetic field balance is offset, but can sensitively detect whether the three-phase inconsistency exists in the switch, if the three-phase switch is switched off simultaneously, the synchronism is good, the unbalanced current time in a zero phase is very short, if a certain phase acts slowly or the arc extinguishing capability is reduced, the unbalanced current in the zero phase can appear for a longer time, thereby the problem of the three-phase inconsistency or, the potential three-phase inconsistency of the switch is fundamentally discovered.
And finally, infrared temperature measurement of the interior of the air switch is realized by utilizing the infrared optical fiber in the snakeskin tube. Many troubles of air switch begin from inside generating heat, however air switch generally adopts plastic casing, and coefficient of heat conductivity is little, and inside outside difficult in time discovery of generating heat, general thermal infrared imager can't detect, the utility model discloses an infrared optical fiber with the help of the snakeskin pipe that detects, exports the infrared image in switch inner gap to germanium glass camera lens, just can conveniently supply thermal infrared imager to detect through this camera lens, has solved the difficult problem of the unable infrared temperature measurement of generating heat of switch inside.
It should be noted that the above-mentioned embodiments are intended to illustrate rather than limit the present invention, and that many features of the different embodiments of the present invention can be interchanged or omitted, and the arrangement of many elements can be changed as required, and that "a" or "an" preceding an element of the present invention does not exclude the presence of a plurality of such elements, and that these changes shall all belong to the scope of the present invention.
Claims (4)
1. A pocket-sized air switch characteristic detection device is characterized by comprising an alternating-current millivoltmeter (1), a protection resistor (2), an active power meter (3), a pincer-shaped mutual inductor (4), a metal flexible pipe (5) and an electric signal timer (9);
one signal input end of the alternating-current millivoltmeter (1) is connected with the protection resistor (2) in series and then is connected with one metal snakeskin tube (5), and the other signal input end of the alternating-current millivoltmeter (1) is directly connected with the other metal snakeskin tube (5); the voltage signal end of the active power meter (3) is connected with the two signal input ends of the alternating-current millivoltmeter (1) in parallel; and a current signal end of the active power meter (3) is connected with a signal input end of the electric signal timer (9) in series and is connected with a secondary winding of the pincer-shaped mutual inductor (4).
2. The air switching characteristic detecting device according to claim 1, wherein the two metal bellows (5) and the pincer-type transformer (4) are disposed on the same side of the housing of the pocket-sized air switching characteristic detecting device.
3. The air switch characteristic detection device according to claim 2, wherein the two metal bellows (5) are provided with spring contacts (6) at the head portions, one metal bellows (5) is provided with an axial infrared optical fiber (7) at the center position, one end of the infrared optical fiber (7) is connected with the spring contact (6), and the other end is connected with the germanium glass optical lens (8).
4. The air switch characteristic detection device according to claim 3, characterized in that the power supply input terminals of the alternating current millivoltmeter (1) and the active power meter (3) and the electric signal timer (9) are connected with the battery (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922229959.3U CN211785956U (en) | 2019-12-13 | 2019-12-13 | Pocket air switch characteristic detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922229959.3U CN211785956U (en) | 2019-12-13 | 2019-12-13 | Pocket air switch characteristic detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211785956U true CN211785956U (en) | 2020-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922229959.3U Active CN211785956U (en) | 2019-12-13 | 2019-12-13 | Pocket air switch characteristic detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211785956U (en) |
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2019
- 2019-12-13 CN CN201922229959.3U patent/CN211785956U/en active Active
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