CN217543243U - Intelligent low pressure detection device - Google Patents

Abstract

The utility model discloses an intelligent low-voltage detection device, relating to the technical field of resistance measurement; the portable storage box comprises a box body and a box cover, wherein one side of the box body is connected with the box cover capable of being opened and closed, a low-voltage detection device is arranged in the box body and comprises a display screen, a power line interface, a binding post and a control button, a limiting opening is formed in the outer side of the box body corresponding to the power line interface and the binding post, a storage box is arranged in the box cover, a partition plate is fixed in the storage box, and the storage box is divided into a plurality of storage cavities by the partition plate; the terminal includes main part, T type head and slip cap, and main part top an organic whole is connected with T type head, and T type overhead portion cover is equipped with the slip cap, and the overhead pot head of T type is equipped with supporting spring, and the supporting spring lower extreme is connected with the slip cap inboard. The intelligent low-voltage detection device is provided with the wiring terminal, the sliding cap is pulled up, the clamping piece of the measuring line is clamped at the T-shaped head, the sliding cap is loosened, the sliding cap is further used for pressing the clamping piece, a knob is not needed for fixing, and the intelligent low-voltage detection device is very convenient and simple.

Description

Intelligent low pressure detection device

Technical Field

The utility model relates to a resistance measurement technical field, more specifically the utility model relates to an intelligent low pressure detection device.

Background

According to the requirements of the preventive test regulation DL/T596-1996 of the power equipment, the resistance test of the conductive loop of various switch equipment has the test current of not less than 100A, the contact resistance is increased due to the oxidation of the contact surface, poor contact fastening and the like, when a large current flows, the temperature of the contact point is increased, the oxidation of the contact surface is accelerated, the contact resistance is further increased, serious accidents are generated continuously, and therefore, the contact resistance needs to be measured frequently or regularly.

When the common loop resistance tester is used for measuring the resistance of the main loop of the low-voltage switch, the influence of field environmental factors on the measurement is not considered, so that the measurement result can be incorrect or inaccurate.

The problem that loop resistance tester used at present exists has, and the terminal passes through the knob and fastens the measuring wire, uses comparatively for troublesome, loaded down with trivial details, consequently, proposes an intelligent low pressure detection device and solves above-mentioned problem.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solve the above-described technical problems in the prior art.

The purpose and the efficacy of the utility model are achieved by the following specific technical means:

an intelligent low-voltage detection device comprises a box body and a box cover, wherein one side of the box body is connected with the box cover which can be opened and closed, the low-voltage detection device is arranged in the box body and comprises a display screen, a power line interface, a binding post and a control button, a limiting opening is formed in the outer side of the box body corresponding to the power line interface and the binding post, a storage box is arranged in the box cover, a partition plate is fixed in the storage box, and the storage box is divided into a plurality of storage cavities by the partition plate;

the terminal includes main part, T type head and slip cap, and main part top an organic whole is connected with T type head, and T type overhead portion cover is equipped with the slip cap, and the overhead pot head of T type is equipped with supporting spring, and the supporting spring lower extreme is connected with the slip cap inboard.

Preferably, the box body is hinged with the box cover through a hinge, and a handle is installed on the rear side of the box body.

Preferably, the upper end of the box body is provided with a lock catch, and the upper end of the box cover is provided with a lock rod corresponding to the lock catch.

Preferably, the hasp includes the fixed block, and the fixed block is equipped with the groove of wearing that runs through from top to bottom, and the fixed block is located and wears groove one side and be equipped with flexible groove, and flexible inslot slides and is provided with the gag lever post, and the gag lever post is located flexible groove upper and lower end and has the extension, and coupling spring between extension and the flexible groove, gag lever post one end run through to wearing the groove, and the other end runs through to the outside of fixed block.

Preferably, the locking lever is including fixed pipe, inserted bar, spacing hole, and fixed pipe is fixed in the lid upper end, and the inserted bar runs through fixed pipe setting, and the inserted bar upper end is located fixed outside of tubes department and is the T form, and the inserted bar is located fixed outside of tubes cover and establishes the spring, and the inserted bar lower extreme is equipped with the spacing hole that transversely runs through, and the inserted bar inserts the cross slot, and spacing hole is inserted with the gag lever post and is closed.

Preferably, the lower end of the outer side of the containing box is connected with a rotating shaft, the inner side of the box cover is provided with a jack corresponding to the rotating shaft, and the rotating shaft is rotatably arranged in the jack.

Preferably, the containing box outside is equipped with the connecting block, and the lid inboard corresponds the connecting block and is equipped with curved spout, and it is provided with the slider to slide in the spout, and the slider is connected with the spring with the inboard upper end of spout, and the connecting block is connected with the slider.

Has the advantages that:

1. this kind of intelligent low pressure check out test set is provided with the terminal, will slide the cap and pull up, presss from both sides the cover at T type head with the clamping piece of measuring line, loosens the slip cap, and then the slip cap pushes down the clamping piece, does not need the knob to fix, and is very convenient simple.

2. This kind of intelligent low pressure detection device is provided with the containing box, and the pulling containing box can revolute the rotation of axes, and the connecting block drives the slider and slides in the spout simultaneously, and the spout is for revoluting the circular-arc spout of axes for the rotatory setting in center, and the slider extrudees the spring, takes out the connecting wire back from the storage chamber, loosens the containing box, and the reaction force through the spring promotes the containing box and resets, and it is very convenient to use.

Description of the drawings:

fig. 1 is the utility model discloses an intelligent low pressure detection device schematic diagram.

Fig. 2 is a schematic diagram of the rear side of the box body and box cover assembly of the present invention.

Fig. 3 is a schematic sectional view of the storage box of the present invention.

Fig. 4 is a schematic cross-sectional view of the terminal of the present invention.

Fig. 5 is a schematic view of the inside cross section of the box cover of the present invention.

Fig. 6 is a cross-sectional view of the locking bar of the present invention.

Fig. 7 is a schematic cross-sectional view of the latch of the present invention.

In FIGS. 1-7: the box body 1, the limiting opening 101, the box cover 2, the sliding groove 201, the sliding block 202, the jack 203, the binding post 3, the column body 301, the T-shaped head 302, the sliding cap 303, the containing box 4, the partition board 401, the rotating shaft 402, the connecting block 403, the locking rod 5, the fixing pipe 501, the inserting rod 502, the limiting hole 503, the lock catch 6, the fixing block 601, the penetrating groove 602, the telescopic groove 603, the limiting rod 604, the display screen 7, the power line interface 8 and the handle 9.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-7, an intelligent low voltage detection device, including a box body 1, a box cover 2, one side of the box body 1 is connected with the foldable box cover 2 through a hinge, a low voltage detection device is installed in the box body 1, the low voltage detection device includes a display screen 7, a power line interface 8, a binding post 3 and a control button, the control button is used for controlling the display screen 7, the power line interface 8 is used for inserting a power line to be connected into a power supply, the binding post 3 is used for measuring resistance value of a resistor in a wiring way, a limiting opening 101 is arranged at the outer side of the box body 1 corresponding to the power line interface 8 and the binding post 3, the limiting opening 101 can limit the wiring, messy situations can not be caused, an accommodating box 4 is arranged in the box cover 2, a partition 401 is fixed in the accommodating box 4, the partition 401 partitions the accommodating box 4 into a plurality of accommodating cavities, connecting wires can be conveniently and can be separately placed in the accommodating cavities without being wound together, and the later use is more convenient; the concrete structure of the binding post 3 is as follows: the sliding head comprises a main body 301, a T-shaped head 302 and a sliding cap 303, wherein the T-shaped head 302 is integrally connected to the top of the main body 301, the sliding cap 303 is sleeved on the top of the T-shaped head 302, a supporting spring is sleeved at the upper end of the T-shaped head 302, and the lower end of the supporting spring is connected with the inner side of the sliding cap 303; when the device is used, the sliding cap 303 is pulled up, the clamping piece of the measuring line is clamped on the T-shaped head 302, the sliding cap 303 is loosened, then the sliding cap 303 presses the clamping piece, a knob is not needed for fixing, and the device is very convenient and simple.

Wherein, the rear side of the box body 1 is provided with a handle 9; after the box body 1 and the box cover 2 are closed, the box body is convenient to lift and carry through the handle 9.

The locking device comprises a box body 1, a lock catch 6, a lock rod 5, a fixing block 601, a through groove 602 which penetrates through the box body 1 from top to bottom, a telescopic groove 603 is formed in the upper end of the fixing block 601 and located on one side of the through groove 602, a limiting rod 604 is arranged in the telescopic groove 603 in a sliding mode, the limiting rod 604 is located on the upper end and the lower end of the telescopic groove 603 and provided with an extending section, a spring is connected between the extending section and the telescopic groove 603, one end of the limiting rod 604 penetrates through the through groove 602, the other end of the limiting rod 604 penetrates through the outer side of the fixing block 601, the lock rod 5 comprises a fixing pipe 501, an insert rod 502 and a limiting hole 503, the fixing pipe 501 is fixed to the upper end of the box body 2, the insert rod 502 penetrates through the fixing pipe 501, the upper end of the insert rod 502 is located on the outer side of the fixing pipe 501 and is in a T shape, the insert rod 502 is located on the outer side of the fixing pipe 501 and provided with a spring, and the lower end of the limiting hole 503 which penetrates through transversely; during the use, close box body 1 with lid 2 lid, then pull out gag lever post 604, press down inserted bar 502, inserted bar 502 inserts wearing groove 602 in, loosen gag lever post 604 for gag lever post 604 inserts in spacing hole 503, can lock box body 1 and lid 2, convenient to use.

The lower end of the outer side of the containing box 4 is connected with a rotating shaft 402, the inner side of the box cover 2 is provided with an insertion hole 203 corresponding to the rotating shaft 402, the rotating shaft 402 is rotatably arranged in the insertion hole 203, the outer side of the containing box 4 is fixedly provided with a connecting block 403, the inner side of the box cover 2 is provided with an arc-shaped sliding groove 201 corresponding to the connecting block 403, a sliding block 202 is arranged in the sliding groove 201 in a sliding manner, the sliding block 202 is connected with a spring at the upper end of the inner side of the sliding groove 201, and the connecting block 403 is connected with the sliding block 202; pulling containing box 4 can revolute rotation of shaft 402, and connecting block 403 drives slider 202 and slides in spout 201 simultaneously, and spout 201 is for revoluting rotation of shaft 402 and being the circular-arc spout of the rotatory setting in center, and slider 202 extrusion spring takes out the connecting wire back from the storage cavity, loosens containing box 4, and the reaction force through the spring promotes containing box 4 and resets, and it is very convenient to use.

The low-voltage switch conductive loop resistor consists of a resistor made of a conductive material, a fixed connecting resistor and a movably connected contact resistor, the resistance values of the first two parts are generally constant, the movable part consists of a movable contact and a fixed contact, and the contact resistance value of the movable part is related to the contact mode, the contact pressure and the state of the outer surface of the contact part, is changed and increased frequently;

when the contact resistance is increased, the contact can generate heat and the contact part of the contact can generate heat seriously when the contact operates under the working current for a long time, even local fusion welding can influence the on-off of the switch, and when the short-circuit current passes through the switch, the dynamic and thermal stability and the on-off performance of the switch can be influenced. The low-voltage switch used in the transformer substation in the power grid in China has the conductive loop resistance of mu omega level, and the conductive loop resistance of most types of switches is below 100 mu omega.

Wherein, the test principle of loop resistance: the loop resistance R includes a resistance Rd of a wire in the loop and a contact resistance Rj of the switching device, where the contact resistance Rj includes a shrinkage resistance Rs of the switching element and a film resistance Rm, so the contact resistance Rj and the loop resistance R may be represented as Rj = Rs + Rm R = Rd + Ri, and in general, rd is much smaller than Rj, then R ≈ Rj is present, factors affecting the contact resistance are many, and it is difficult to accurately calculate the contact resistance, and in engineering practice, the contact resistance Rj = K (0.102F) -m is calculated by the following formula.

Where Rj is μ QK, which is related to contact materials, surface film conditions, contact methods, etc., and F is a contact force, and Nm is a coefficient related to contact surface deformation, m =0.5 for point contact, m is between 0.5 and 1 and is about 0.7 for line contact, and m =1 for surface contact, which is generally found by experiments.

The loop resistance test method comprises the following steps: in the application of the power industry, the traditional method for measuring the loop resistance of the switching device is a direct-current double-arm bridge method, but because the current value of a test loop is small, an oxide film of a contact surface of a contact of the switching device is difficult to break down, so that the measured value is much larger than the true value, the measurement error is overlarge, and because a voltage drop signal formed after the contact surface of the contact of the switching device passes a small current is very weak, the voltage drop can be detected only by test equipment with extremely high sensitivity, and for the reasons, when the loop resistance of the switching device is tested by the direct-current voltage drop method according to the standards of GB763-90, DL405-96 and the like, the loop current is not less than 100A.

Among them, the voltage drop method: in the measuring loop, direct current is conducted, voltage drop is generated on contact resistance of switch equipment in the loop, the voltage drop and current value in the loop are measured, and then the contact resistance of the switch equipment can be calculated according to ohm law.

The principle of the microohm meter is still a direct current voltage drop method, 220V voltage is rectified, a switching circuit is used for converting the voltage into high-frequency current, then the high-frequency current is rectified into low-voltage direct current of 100A, the current can be used as a measurement power supply, the microohm meter can not only provide automatic constant current, but also can digitally display a loop resistance value and test current, during measurement, a measured loop resistance Rx and a standard resistance shunt Rr in the microohm meter form a series circuit, a formula Ux/Rx = Ur/Rr = I is obtained according to ohm law, rx = (Ux/Ur) xr does not influence a measurement result due to errors of the measured current, the measurement principle of the microohm meter adopts a four-wire system, and a current source in the microohm meter adopts an advanced switching power supply technology, so that the microohm meter has the characteristics of anti-interference, strong stability and the like.

Wherein, the low-voltage switch is a closed structure, a part of the specified resistance measuring end of the conductive loop and the fixed connection part thereof is arranged outside the closed body, the static contact and the other part thereof are arranged inside the closed body, because the measurement is carried out outdoors on site, the temperature inside the measured low-voltage switch is often different from the outside temperature, when the temperature inside and outside is different, the measured conductive loop can generate a temperature difference potential (i.e. a thermoelectric potential eT), the thermoelectric potential eT has a certain magnitude (mu V magnitude) and direction (+, -), the influence mode is superposed on the potential U of the measured conductive loop, when the eT direction is the same as the U direction, the potential of the measured conductive loop is U + eT, when the direction is opposite to that of U-eT, obviously, when a current direction is measured, the existence of eT enables the measured value of RX to be larger or smaller than the actual value of RX, and through a large number of field measurements, the difference between the measured value of the same tested low-voltage switch in the positive current direction and the measured value of the same tested low-voltage switch in the reverse current direction reaches 10-2 orders of magnitude, thus the influence of eT is proved to exist and not be ignored, therefore, when the tested low-voltage switch conductive loop has a temperature difference potential, the measured value of the loop resistance tester based on the general voltammetry principle is not correct as the final quantity result of RX, because the influence of eT is not eliminated, which is the second main problem existing in the used loop resistance tester.

The characteristic that the low-voltage switch conductive loop mu omega magnitude small resistance is measured in a large current state is that on the basis of a voltammetry method, a singlechip technology is applied, an intelligent digital loop resistance tester adopting a potential ratio comparison method and a current commutation method is adopted, the influence of errors, drift and temperature difference potential of test current on a measurement result can be eliminated in the low-voltage switch conductive loop resistance measurement process, an accurate and reliable RX measurement result is obtained, state detection and performance evaluation are carried out on the switch equipment in a low-voltage system through loop resistance test, the fault rate can be reduced, the service life of the switch equipment can be prolonged, the tester can store, inquire and remotely manage the measurement result in real time during field measurement, the field simple rough measurement and data management mode is thoroughly changed, in addition, the measurement of the low-voltage switch conductive loop resistance is two links in the large current bucket Q magnitude small resistance measurement field, the magnitude of the measurement instrument is traced to a standard device with corresponding accuracy grade, a second-level large current bucket Q magnitude resistance measurement standard and a standard device are established, and a complete magnitude source system with the same practical significance is formed

The working principle is as follows:

during the use, open lid 2, correspond power cord interface 8 with the power cord and insert, then from the card spacing opening 101 of going into, the other end connects the electricity, starts low pressure detection device, then connects the measuring wire terminal 3, will slide cap 303 and pull up, presss from both sides the cover at T type head 302 with the clamping piece of measuring wire, loosens slide cap 303, and then slide cap 303 pushes down the clamping piece, and the other end is got the junction of voltage switch through the clip clamp, and the debugging is measured can.

Claims (7)

1. An intelligent low-voltage detection device comprises a box body (1) and a box cover (2), and is characterized in that one side of the box body (1) is connected with the box cover (2) capable of being opened and closed, a low-voltage detection device is arranged in the box body (1), the low-voltage detection device comprises a display screen (7), a power line interface (8), a binding post (3) and a control button, a limiting opening (101) is arranged on the outer side of the box body (1) corresponding to the power line interface (8) and the binding post (3), a containing box (4) is arranged inside the box cover (2), a partition plate (401) is fixed inside the containing box (4), and the containing box (4) is divided into a plurality of containing cavities by the partition plate (401);

terminal (3) are including main part (301), T type head (302) and slip cap (303), main part (301) top body coupling has T type head (302), and T type head (302) top cover is equipped with slip cap (303), and the pot head is equipped with supporting spring on T type head (302), and the supporting spring lower extreme is connected with slip cap (303) inboard.

2. The intelligent low voltage detection device according to claim 1, wherein the box body (1) is hinged with the box cover (2) through a hinge, and a handle (9) is installed at the rear side of the box body (1).

3. The intelligent low voltage detection device according to claim 1, wherein a lock catch (6) is installed at the upper end of the box body (1), and a lock rod (5) is arranged at the upper end of the box cover (2) corresponding to the lock catch (6).

4. The intelligent low-voltage detection device as claimed in claim 3, wherein the latch (6) comprises a fixed block (601), the fixed block (601) is provided with a through groove (602) which penetrates through the fixed block up and down, a telescopic groove (603) is formed in one side of the through groove (602) of the fixed block (601), a limit rod (604) is slidably arranged in the telescopic groove (603), the limit rod (604) is provided with an extension section which is arranged at the upper end and the lower end of the telescopic groove (603), a connecting spring is arranged between the extension section and the telescopic groove (603), one end of the limit rod (604) penetrates through the through groove (602), and the other end of the limit rod penetrates through the outer side of the fixed block (601).

5. The intelligent low-voltage detection device as claimed in claim 3, wherein the locking rod (5) comprises a fixed tube (501), an insertion rod (502) and a limiting hole (503), the fixed tube (501) is fixed at the upper end of the box cover (2), the insertion rod (502) penetrates through the fixed tube (501) and is arranged in a T shape, the upper end of the insertion rod (502) is positioned at the outer side of the fixed tube (501), the insertion rod (502) is positioned at the outer side of the fixed tube (501) and is sleeved with a spring, the lower end of the insertion rod (502) is provided with the limiting hole (503) which penetrates transversely, the insertion rod (502) is inserted into the through groove (602), and the limiting hole (503) is inserted into the limiting rod (604).

6. The intelligent low voltage detection device according to claim 1, wherein the lower end of the outer side of the storage box (4) is connected with a rotating shaft (402), the inner side of the box cover (2) is provided with a jack (203) corresponding to the rotating shaft (402), and the rotating shaft (402) is rotatably arranged in the jack (203).

7. The intelligent low voltage detection device according to claim 1, wherein a connecting block (403) is arranged on the outer side of the storage box (4), an arc-shaped sliding groove (201) is arranged on the inner side of the box cover (2) corresponding to the connecting block (403), a sliding block (202) is arranged in the sliding groove (201) in a sliding manner, a spring is connected between the sliding block (202) and the upper end of the inner side of the sliding groove (201), and the connecting block (403) is connected with the sliding block (202).

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