CN211718437U - Low-voltage alternating-current insulation megger - Google Patents
Low-voltage alternating-current insulation megger Download PDFInfo
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- CN211718437U CN211718437U CN201921775524.2U CN201921775524U CN211718437U CN 211718437 U CN211718437 U CN 211718437U CN 201921775524 U CN201921775524 U CN 201921775524U CN 211718437 U CN211718437 U CN 211718437U
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Abstract
The utility model discloses an insulating megger of low pressure alternating current, include casing, hand generator, acceleration rate gear train, handle, rectifier bridge and be used for detecting the voltmeter of hand generator output voltage value, acceleration rate gear train transmission is connected hand generator with between the handle, the surface of casing is equipped with direct current electric interface and alternating current interface, hand generator's output line of alternating current connects alternating current electric interface, the rectifier bridge has two alternating current input ends, a direct current positive output, a direct current negative output, direct current positive output and direct current negative output are connected direct current electric interface, alternating current input end with hand generator's output line is connected. The low-voltage alternating-current insulation megger is powered by a hand-operated alternating-current generator, is simple and reliable, and saves a large amount of workload and time.
Description
Technical Field
The utility model relates to a low pressure alternating current insulation megger belongs to power electrical equipment technical field.
Background
At present, when distribution network low-voltage electrical equipment and cables are rush-repaired, in order to check whether the insulation of the low-voltage electrical equipment and the low-voltage cables is normal, an insulation megohmmeter is often used for checking. However, the output of the insulation megohmmeter is direct-current voltage, an actual low-voltage electric loop is alternating current, a plurality of alternating-current coils (such as a voltmeter, a watt-hour meter and an indicator lamp) exist in the loop, the direct-current resistance of the alternating-current coils is almost zero, and when the insulation megohmmeter is adopted for inspection, great deviation occurs when the equipment and the cable are inspected, so that related dismantling work is needed before the inspection, the electrical connection of the tested equipment and the cable is removed, and the insulation megohmmeter can be used for insulation inspection.
Therefore, the inspection of the insulation megohmmeter at the present stage often causes misjudgment, is time-consuming and labor-consuming, and cannot meet the requirement of rapid first-aid repair.
SUMMERY OF THE UTILITY MODEL
The utility model provides a low pressure alternating current insulation megger, it has overcome the not enough that the background art exists. The utility model provides a technical scheme that its technical problem adopted is:
the utility model provides an insulating megger of low pressure alternating current, includes casing, hand generator, acceleration gear set, handle, rectifier bridge and is used for detecting the voltmeter of hand generator output voltage value, hand generator, acceleration gear set and rectifier bridge are all installed in the casing, the handle rotates to set up on this casing and one end stretches into in the middle of the casing, acceleration gear set transmission is connected hand generator with between the handle, the surface of casing is equipped with direct current interface and alternating current interface, hand generator's output line is connected alternating current interface, the rectifier bridge has two alternating current input ends, the anodal output of direct current, a direct current negative pole output, the anodal output of direct current and direct current negative pole output are connected direct current interface, alternating current input end with hand generator's output line is connected, the rectifier bridge is connected with the voltmeter in parallel.
In a preferred embodiment: the speed-increasing gear set has a speed ratio of 1: 20.
in a preferred embodiment: the output voltage of the alternating current hand-operated generator is 0-380V.
In a preferred embodiment: the alternating current hand generator outputs the maximum capacity of 100W.
In a preferred embodiment: the alternating current hand generator is a brushless motor.
In a preferred embodiment: the display screen of the voltmeter is exposed out of the outer surface of the shell.
In a preferred embodiment: the voltmeter is an alternating current mechanical voltmeter.
In a preferred embodiment: the speed increasing gear set is a steel gear set.
Compared with the background technology, the technical scheme has the following advantages:
1. the manual operation handle, drive the hand generator operation electricity generation of interchange through the acceleration gear train, join in marriage net low voltage electrical equipment, when the cable is salvageed, check low voltage electrical equipment, whether low voltage cable is insulating normal, only need be with equipment, the switch disconnection of cable both sides, carry out the electricity with alternating current interface, need not the disconnection, directly carry out insulation inspection to the equipment of being investigated promptly, can judge the insulating condition of the equipment of being investigated basically through observing the magnitude of voltage, because alternating current interface output is alternating voltage, can not receive the interference of alternating current coil (such as voltmeter, the kilowatt-hour meter, the pilot lamp) in the electric circuit, thereby shorten check-out time, reach the purpose of accomplishing the work of salvageing fast. Therefore, the low-voltage alternating-current insulation megger is powered by the hand-operated alternating-current generator, is simple and reliable, and saves a large amount of workload and time.
2. The rectifier bridge is used for converting alternating current and outputting direct current, so that the rectifier bridge can be used for other fault removal places such as insulation inspection of a secondary circuit in high-voltage equipment through a direct current interface, can effectively find insulation weak points in the direct current circuit, and has a certain auxiliary effect on inspection of single-phase ground loss of a high-voltage secondary direct current power supply circuit.
3. With the corresponding increase of the output voltage of the hand-operated alternating-current generator when the rotating speed of the hand-operated alternating-current generator is increased, the voltage applied to the tested equipment can be gradually increased, so that the insulation problem of the tested equipment can be found as soon as possible, and the damage to the test equipment caused by the direct pressurization of the fault equipment can be avoided.
Drawings
The present invention will be further explained with reference to the drawings and examples.
FIG. 1 shows a schematic diagram of a low voltage AC isolation megger.
Fig. 2 shows a circuit schematic of a low voltage ac isolation megger.
Detailed Description
Referring to fig. 1 and 2, a low voltage ac insulation megger includes a housing 10, an ac hand generator 20, a speed-increasing gear set 30, a handle 40, a rectifier bridge 50, and a voltmeter 60 for detecting an output voltage value of the ac hand generator. Alternating current hand generator 20, speed increasing gear set 30 and rectifier bridge 50 all install in the casing 10, handle 40 rotates to set up on this casing 10 and one end stretches into in the middle of the casing, speed increasing gear set 30 transmission is connected alternating current hand generator 20 with between the handle 40, handle 40 starts alternating current hand generator 20 operation electricity generation through speed increasing gear set 30 when rotating. The outer surface of the housing 10 is provided with a dc electrical interface 12 and an ac electrical interface 14, and the output line of the ac hand generator 20 is connected to the ac electrical interface 14. The rectifier bridge 50 has two ac input terminals, a dc positive output terminal, and a dc negative output terminal, the dc positive output terminal and the dc negative output terminal are connected to the dc interface 12, the ac input terminal 14 is connected to the output line of the ac hand generator 20, that is, the rectifier bridge 50 is connected in parallel to the voltmeter 60. Thus, the ac hand generator 20 outputs ac power to the ac interface 14, and the rectifier bridge 50 can also convert ac power to obtain dc power and connect to the dc interface, and the voltmeter 60 reflects the output voltage of the ac hand generator 20 at any time.
The alternating current hand generator 20, the speed-increasing gear set 30, the rectifier bridge 50 and the voltmeter 60 are all in the prior art, the alternating current hand generator, the speed-increasing gear set, the rectifier bridge 50 and the voltmeter 60 are not used for protecting the known components, but the components are combined together according to a specific connection relation and then combined with the shell 10, the alternating current output voltage is in direct proportion to the rotating speed of the handle 40, the output voltage can be flexibly controlled, and therefore the low-voltage alternating current insulation megger which can be manually operated to control the output alternating current and the direct current is obtained and is used for rapidly checking whether the insulation of low-voltage electrical equipment and low-voltage cables.
Preferably, the speed-increasing gear set 30 has a gear ratio of 1: preferably, a steel gear set is used 20.
Preferably, the output voltage of the ac hand generator 20 is 0-380V, the maximum output capacity is 100W, and a brushless motor is adopted.
Preferably, the display screen of the voltmeter 60 is exposed on the outer surface of the housing 10, so as to facilitate direct observation of the voltage value. Meanwhile, the voltmeter 60 is preferably an ac mechanical voltmeter.
The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited by this description, and all equivalent changes and modifications made within the scope and the specification of the present invention should be covered by the present invention.
Claims (8)
1. A low-voltage alternating-current insulation megger is characterized in that: including casing, hand cranking generator, acceleration gear group, handle, rectifier bridge and be used for detecting the voltmeter of hand cranking generator output voltage value, hand cranking generator, acceleration gear group and rectifier bridge all install in the casing, the handle rotates to set up on this casing and one end stretches into in the middle of the casing, acceleration gear group transmission is connected alternating current hand cranking generator with between the handle, the surface of casing is equipped with direct current electric interface and alternating current electric interface, hand cranking generator's output line connects alternating current electric interface, the rectifier bridge has two alternating current input, the anodal output of direct current, a direct current negative pole output, the anodal output of direct current and direct current negative pole output are connected direct current electric interface, alternating current input with hand cranking generator's output line is connected, the rectifier bridge is connected with the voltmeter in parallel.
2. A low voltage ac isolation megger as claimed in claim 1, wherein: the speed-increasing gear set has a speed ratio of 1: 20.
3. a low voltage ac isolation megger as claimed in claim 2, wherein: the output voltage of the alternating current hand-operated generator is 0-380V.
4. A low voltage ac isolation megger as claimed in claim 3, wherein: the alternating current hand generator outputs the maximum capacity of 100W.
5. A low voltage AC isolation rocking meter according to claim 1 or 4, characterized in that: the alternating current hand generator is a brushless motor.
6. A low voltage ac isolation megger as claimed in claim 1, wherein: the display screen of the voltmeter is exposed out of the outer surface of the shell.
7. A low voltage AC isolation megger as claimed in claim 6, wherein: the voltmeter is an alternating current mechanical voltmeter.
8. A low voltage ac isolation megger as claimed in claim 1, wherein: the speed increasing gear set is a steel gear set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921775524.2U CN211718437U (en) | 2019-10-22 | 2019-10-22 | Low-voltage alternating-current insulation megger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921775524.2U CN211718437U (en) | 2019-10-22 | 2019-10-22 | Low-voltage alternating-current insulation megger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211718437U true CN211718437U (en) | 2020-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921775524.2U Active CN211718437U (en) | 2019-10-22 | 2019-10-22 | Low-voltage alternating-current insulation megger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211718437U (en) |
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2019
- 2019-10-22 CN CN201921775524.2U patent/CN211718437U/en active Active
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