CN211856824U - Leakage protection test box - Google Patents
Leakage protection test box Download PDFInfo
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- CN211856824U CN211856824U CN202020025744.XU CN202020025744U CN211856824U CN 211856824 U CN211856824 U CN 211856824U CN 202020025744 U CN202020025744 U CN 202020025744U CN 211856824 U CN211856824 U CN 211856824U
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- ohmmeter
- switch
- power
- leakage protection
- adjustable resistance
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Abstract
The utility model relates to the electromechanical field of colliery, disclose a leakage protection test box, including the casing, be provided with a plurality of adjustable resistance, ohmmeter and power in the casing, the casing surface is provided with the display screen of ohmmeter, the adjust knob of adjustable resistance, switch and two external terminals; the utility model discloses a switch, including switch, ohmic meter, power switch, adjustable resistance series connection, a plurality of adjustable resistance series connection back, power switch connects at the power both ends of ohmmeter after establishing ties with the power, its both ends are connected with two probe connections of ohmmeter respectively after a plurality of adjustable resistance series connection, two outside terminals are connected with two probe connections of ohmmeter respectively, one of two outside terminals is used for ground connection, and another is used for connecting the leakage test return circuit of the switchgear that awaits measuring. The utility model discloses can carry out the electric leakage test to the switch of different specifications, can select different electric leakage test resistance as required during the experiment, test resistance value can directly read from the ohmmeter, its simple structure, convenient operation, safety, but wide application in colliery electromechanical field.
Description
Technical Field
The utility model relates to a colliery electromechanical field, concretely relates to earth leakage protection test box for testing colliery is switchgear earth leakage protection performance in pit.
Background
The fourth hundred fifty rules of the coal mine safety regulations stipulate that high-voltage control equipment of underground high-voltage motors and power transformers should have short-circuit, overload, grounding and undervoltage release protection. The feed line led out from the underground mining area substation, the mobile substation or the distribution point must have short circuit, overload and leakage protection. The control equipment of the low-voltage motor has to have short circuit, overload, single-phase wire break, leakage locking protection and remote control functions. And the leakage locking value and the action value are clearly specified, and the following table is shown:
TABLE 1 leakage Lock-out value and action value
At present, the most common protection modes of the underground coal mine leakage protection device are an additional direct current detection mode and a zero sequence current directional leakage protection mode. According to the fourth hundred and fifty three regulations of the coal mine safety code, a trip test must be carried out on the low-voltage leakage protection every day. In practical application, the low-voltage leakage protection is found to be tested even if the low-voltage leakage protection is strictly regulated, and all tests are normal. In the practical application process in the underground, the phenomenon of leakage fault override trip still often occurs, the normal power supply of other loops in the power supply network is influenced, and the production is stopped; sometimes, the phenomenon of no tripping due to electric leakage can occur, thus causing great potential safety hazard. For such a situation, through analyzing and testing the leakage protection system, it is found that in some switch device leakage test loops, the resistance value of the leakage test resistor is too low and is far lower than the specified value in the table. This causes the switch to be able to realize the protection function at low resistance, but not the leakage protection function at high resistance grounding, which is a major potential safety hazard.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes the deficiencies in the prior art, the technical problem who solves is: the leakage protection test box can be used for verifying whether the leakage protection function of the switch meets the requirements or not.
In order to solve the technical problem, the utility model discloses a technical scheme be: a leakage protection test box comprises a shell, wherein a plurality of adjustable resistors, an ohmmeter and a power supply are arranged in the shell, and a display screen of the ohmmeter, an adjusting knob of the adjustable resistors, a power switch and two external wiring terminals are arranged on the surface of the shell; the utility model discloses a switch, including switch, ohmic meter, power switch, adjustable resistance series connection, a plurality of adjustable resistance series connection back, power switch connects at the power both ends of ohmmeter after establishing ties with the power, its both ends are connected with two probe connections of ohmmeter respectively after a plurality of adjustable resistance series connection, two outside terminals are connected with two probe connections of ohmmeter respectively, one of two outside terminals is used for ground connection, and another is used for connecting the leakage test return circuit of the switchgear that awaits measuring.
The number of the adjustable resistors is 4.
The maximum resistance value of the adjustable resistor is 10k omega.
The shell is of a trapezoidal table shape, a front panel of the shell is made of aluminum alloy, the thickness of the front panel is 2mm, and the display screen, the adjusting knob (3), the power switch and the two external wiring terminals are all arranged on the front panel; the other plates were made of insulating material and had a thickness of 3 mm.
Compared with the prior art, the utility model following beneficial effect has: the utility model provides a leakage protection test box, whether the leakage protection function that not only can the check switch is qualified, its simple structure moreover, convenient operation can wide application in colliery electromechanical device field.
Drawings
Fig. 1 is a schematic view of an external structure of an earth leakage protection test box according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an earth leakage protection test box according to an embodiment of the present invention;
in the figure: the display screen is characterized in that the display screen is a shell 1, the display screen is a display screen 2, the adjusting knob is 3, the power switch is 4, the external wiring terminal is 5, the adjustable resistor is 6, the ohmmeter is 7, the power supply is 8, and the front panel is 9.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention; based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, the embodiment of the utility model provides a leakage protection test box, including casing 1, be provided with a plurality of adjustable resistance 6, ohmmeter 7 and power 8 in the casing 1, casing 1 surface be provided with ohmmeter the display screen 2 adjustable resistance's adjust knob 3, switch 4 and two external terminals 5.
As shown in fig. 2, the power switch 4 is connected with the power supply at two ends of the power supply of the ohmmeter after being connected in series, two ends of the adjustable resistors are respectively connected with two probes of the ohmmeter after being connected in series, two external binding posts 5 are respectively connected with two probes of the ohmmeter, one of the two external binding posts 5 is used for grounding, and the other external binding post is used for connecting a leakage test loop of the to-be-tested switchgear.
Specifically, as shown in fig. 2, in the present embodiment, the number of the adjustable resistors is 4, which are R1, R2, R3 and R4, and the maximum resistance value is 10k Ω.
Further, as shown in fig. 1, in this embodiment, the housing 1 is a trapezoidal shape, the front panel 9 is made of an aluminum alloy material, the thickness is 2mm, and the display screen 2, the adjusting knob 3, the power switch 4 and the two external terminals 5 are all disposed on the front panel 9; the other plates were made of insulating material and had a thickness of 3 mm.
The utility model discloses a theory of operation and working process as follows: the selection of the grounding resistance value can be realized by connecting four adjustable resistors with the maximum resistance value of 10K omega in series; the two ends of the ohmmeter are connected with the adjustable resistor in parallel, and the current resistance value of the grounding resistor can be displayed; the power switch is connected in series in the power circuit of the ohmmeter to control the power supply of the ohmmeter. During the test, one of two external terminals of the test box is connected in a leakage test loop of the switch, the other terminal is reliably grounded, a power switch of the device is turned on, the resistance value of the grounding resistor is selected according to needs, then the power switch 4 is turned off, and the leakage test is carried out on the switch according to operation rules. If the switch can be tripped normally, the leakage protection function of the switch is normal; if the switch can not be tripped normally, the leakage protection function of the switch is not in effect. Therefore, the utility model discloses can carry out the electric leakage test to the switch of different specifications, can select different electric leakage test resistance as required during the experiment, test resistance value can directly read from the ohmmeter, its simple structure, convenient operation, safety can wide application in colliery electromechanical field.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (4)
1. A leakage protection test box is characterized by comprising a shell (1), wherein a plurality of adjustable resistors, an ohmmeter and a power supply are arranged in the shell (1), and a display screen (2) of the ohmmeter, an adjusting knob (3) of the adjustable resistors, a power switch (4) and two external wiring terminals (5) are arranged on the surface of the shell (1); the utility model discloses a switch of switch, ohmic meter, power supply, power switch, adjustable resistance series connection, two outside terminals (5) are connected with the probe of ohmmeter respectively, switch (4) are connected at the power both ends of ohmmeter after establishing ties with the power, its both ends are connected with two probe connections of ohmmeter respectively after a plurality of adjustable resistance series connection, one of two outside terminals (5) is used for ground connection, and another is used for connecting the electric leakage test return circuit of the switchgear that awaits measuring.
2. A leakage protection test chamber as claimed in claim 1, wherein the number of said adjustable resistors is 4.
3. A leakage protection test chamber as claimed in claim 1, wherein the maximum resistance of the adjustable resistor is 10k Ω.
4. A leakage protection test box according to claim 1, wherein the housing (1) is of a ladder-type, the front panel (9) is made of aluminum alloy and has a thickness of 2mm, and the display screen (2), the adjusting knob (3), the power switch (4) and the two external terminals (5) are all arranged on the front panel (9); the other plates were made of insulating material and had a thickness of 3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020025744.XU CN211856824U (en) | 2020-01-07 | 2020-01-07 | Leakage protection test box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020025744.XU CN211856824U (en) | 2020-01-07 | 2020-01-07 | Leakage protection test box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211856824U true CN211856824U (en) | 2020-11-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020025744.XU Active CN211856824U (en) | 2020-01-07 | 2020-01-07 | Leakage protection test box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211856824U (en) |
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2020
- 2020-01-07 CN CN202020025744.XU patent/CN211856824U/en active Active
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