CN214895726U

CN214895726U - Low-voltage leakage current detection device

Info

Publication number: CN214895726U
Application number: CN202121301651.6U
Authority: CN
Inventors: 陈明
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-11
Filing date: 2021-06-11
Publication date: 2021-11-26
Anticipated expiration: 2031-06-11

Abstract

The utility model discloses a low-voltage leakage current detection device, which comprises a pincerlike meter, an induction coil and a docking mechanism, wherein a jaw of the pincerlike meter is clamped on the induction coil, the docking mechanism is connected on the induction coil, and the induction coil is directly connected into a detection circuit through the docking mechanism; a magnetic flux amplifier is formed by the induction coil, so that the leakage current of the circuit can be detected, and meanwhile, the detection can be performed by only one induction coil, so that the cost of the equipment is low.

Description

Low-voltage leakage current detection device

Technical Field

The utility model relates to a leakage current check out test set field, concretely relates to low pressure leakage current detection device.

Background

The leakage current is the current generated by the leakage of the circuit due to the damage of an insulating layer or other reasons, the leakage current directly forms a loop through the ground, the circuit needs to be detected for ensuring safety, the current leakage current is mainly detected through an electronic watch and a pincerlike watch, but the current leakage current has great uncertainty, the leakage current is close to short circuit, and the risk of burning out the meter exists; meanwhile, the clamp meter can be used for detecting leakage current, and meanwhile, the precision of the clamp meter is limited, so that small current cannot be measured; some devices for detecting leakage current exist in the market at present, but the precision of measuring devices is limited, the carrying is inconvenient, and meanwhile, the manufacturing cost of the devices is high.

Patent number is 2019218834472 patent name zero sequence current measuring apparatu, block on the three-phase four-wire through pincerlike current transformer, pincerlike current transformer is connected with output coil, the pincerlike table card is on output coil, the electric leakage position of three-phase four-wire is judged through the reading above the pincerlike table, but can't read leakage current's size, the corresponding increase of cost of while equipment (increased electrophoresis pincerlike current transformer), non-three-phase four-wire circuit can't directly be examined to above-mentioned equipment simultaneously, there is very big restriction in operation and use.

Disclosure of Invention

To the not enough of above-mentioned prior art, the utility model provides a low pressure leakage current detection device, the cost ratio of leakage detection equipment is low, and the more simple and convenient use of detection method simultaneously and the precision that the leakage current detected out satisfy the requirement, provide the data support to getting rid of low pressure circuit leakage fault, improved low pressure electrician's work efficiency of getting rid of the trouble like this, in the low pressure maintenance electrician, this equipment has fine application prospect.

In order to achieve the above purpose, the utility model discloses a scheme: the utility model provides a low pressure leakage current detection device, includes pincerlike meter, induction coil and docking mechanism, wherein pincerlike meter's the card of keeping silent on induction coil, is connected with docking mechanism on induction coil, directly inserts induction coil to detection circuitry through docking mechanism.

Preferably, the docking mechanism comprises a testing rod, an electrode clamp and a connecting wire, wherein the electrode clamp and the testing rod are respectively connected with the connecting wire, the connecting wire is connected with the induction coil, and the induction coil is connected into the detection circuit through the electrode clamp, the testing rod and the connecting wire.

Preferably, induction coil is a plurality of, and every induction coil constitutes through multiturn coil, and the parcel has the insulating layer on every induction coil, is provided with the splice that splices with other coils on every induction coil, can realize establishing ties each other between a plurality of induction coil through splice, and induction coil's splice carries out high-speed joint with connecting wire simultaneously.

Preferably, all be provided with on every connecting wire and unreel the subassembly, connecting wire is around unreeling on the subassembly, it includes the baffle to unreel the subassembly, winding drum and rotatory return spring, the baffle is two and two baffles set up relatively, be provided with the connecting rod between two baffles and the both ends of connecting rod are fixed with the baffle respectively, the cover has the winding drum on the connecting rod, winding drum rotates on the connecting rod like this, be provided with rotatory return spring between winding drum and one of them baffle, connecting wire's wherein one end is passed the baffle and is connected on induction coil, be provided with two gag lever posts that are parallel to each other between two baffles, connecting wire's other one end alternates between two gag lever posts, the electrode holder can't pass two gag lever posts.

Compared with the prior art, the utility model has the advantages of: 1. a magnetic flux amplifier is formed by the induction coil, so that the magnitude of leakage current of the circuit can be detected, and meanwhile, the detection can be performed by only one induction coil, so that the cost of the equipment is low; 2. the arranged induction coils can be mutually connected in series, so that the number of turns of the coils can be quickly adjusted to confirm the magnitude of the leakage current; 3. the unwinding assembly can be used for accommodating the connecting wire, and the induction coil can be connected into the detected circuit by pulling out the connecting wire when the detection device is required to be used, so that the accommodating and unwinding are convenient; 4. therefore, the work efficiency of fault removal of the low-voltage electrician is improved, and the equipment has a good application prospect in low-voltage maintenance electricians.

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is a schematic diagram of the induction coil and the butt joint between the induction coils of the present invention.

Fig. 3 is a schematic diagram illustrating the matching between the unwinding assembly and the connecting wire.

The device comprises a clamp meter 1, a clamp meter 2, an induction coil 2.1, an insulating layer 2.2, a splicing joint 3, a butt joint mechanism 3.1, an electrode clamp 3.2, a connecting wire 3.3, an unreeling assembly 3.4, a baffle 3.5, a connecting rod 3.6, a winding drum 3.7, a rotary return spring 3.8, a limiting rod 3.9 and a test rod.

Detailed Description

The drawings are now assembled to further explain the utility model.

As shown in fig. 1-3, a low-voltage leakage current detection device comprises a clamp meter 1, an induction coil 2 and a docking mechanism 3, wherein the jaw of the pincer-like meter 1 is clamped on the induction coil 2, the induction coil 2 is connected with a butt joint mechanism 3, the induction coil 2 is directly connected into a detection circuit or an electric appliance through the docking mechanism 3 (namely one end of the docking mechanism 3 is connected with a line to be detected, the other end of the docking mechanism 3 is connected to the live wire, so that the current on the live wire enters the induction coil 2 and flows to the tested line or the electric appliance (on the insulating layer of the tested line or the electric appliance), the tested line or the electric appliance is grounded), when the circuit leaks electricity, the current can form a loop on the induction coil 2 and the ground, so that the leakage circuit on the induction coil 2 is detected through the pincerlike meter 1, and meanwhile, the butt joint mechanism 3 can judge the leakage position.

The butt joint mechanism 3 comprises a test rod 3.9, electrode clamps 3.1 and a connecting wire 3.2, wherein the electrode clamps 3.1 and the test rod 3.9 are respectively connected with the connecting wire 3.2 (namely, the connecting wire 3.2 is two, and the two connecting wires 3.2 are respectively connected with two poles of the induction coil 2, the electrode clamps 3.1 clamp an insulating layer of a tested circuit or an electric appliance during detection, and the test rod 3.9 is in butt joint with a live wire at the same time, when a reading appears on the clamp-shaped meter 1, the reading appearing on the clamp-shaped meter is the magnitude of leakage current, the connecting wire 3.2 is connected with the induction coil 2, the induction coil 2 is connected into a detection circuit and the electric appliance through the electrode clamps 3.1 and the test rod 3.9 and the connecting wire 3.2 (namely, the leakage current passes through the induction coil), and the magnitude of the leakage current is read by being connected onto the live wire through the induction coil 2.

The utility model discloses detect the principle of leakage circuit:

the inductive circuit (leakage current) I =1/R Nd Φ/dt.

In the formula: i is induction current; r is a loop resistance; n is the number of induced potential generating turns (i.e. the number of induction coil 2 turns); phi is the amount by which the magnetic flux is related to the current.

The clamp meter 1 is manufactured based on the electromagnetic induction principle, and within the measuring accuracy range of the meter, N =1 (number of turns), and the degree at this time is i (a).

When the measured current is smaller, the number of turns of N can be properly increased to improve the measurement accuracy.

I.e. when N =2 (turns);

the measured current value is 1/2I (A);

when the detected leakage current is very small, N =100 (turns) can be selected;

a current value 1/100I × 1000 (mA) =10I (mA) of the measured leakage current;

through the deduction, the 100-turn induction coil 2 is selected and used, the clamp meter 1 is matched for use, the leakage current can be measured, and during reading, the data of the meter only needs to be enlarged by 10 times, namely, the milliampere value of the leakage current to be measured is obtained.

For example, the measured leakage value was 2.6 x 10=26mA when the meter reading showed 2.6A; when the meter reading is 5A, the measured leakage current value is 5 × 10=50 mA.

According to the detection principle (the detection principle is that when the circuit leaks electricity, the current can be detected from a power live wire, a butting mechanism, an induction coil, a detected body and the ground, so that a loop is formed, the leakage current value (namely the current flowing in the induction coil) is detected by using a pincerlike meter), when the leakage current is detected, a plurality of coils with different turns are required to be prepared, the induction coils 2 are provided, each induction coil 2 is formed by a plurality of turns, an insulating layer 2.1 is wrapped on each induction coil 2, a splicing joint 2.2 spliced with other coils is arranged on each induction coil 2, the plurality of induction coils 2 can be connected in series through the splicing joint 2.2, meanwhile, the splicing joint 2.2 of the induction coil 2 is rapidly connected with a connecting lead 3.2, and coils with different turns are spliced to form coils with specific turns, need not like this according to the new coil of remanufacturing for guaranteeing measurement accuracy, mainly splice into the number of turns that oneself wanted with a plurality of induction coil 2 (dock adjacent induction coil 2 through splice joint 2.2, then fix a plurality of induction coil 2 together (can through sticky tape is fixed)), can also adopt the leakage current that different numbers of turns measured to carry out the contrast simultaneously, realize the accuracy of confirming data like this.

When a low-voltage line or a hidden wire is detected, the power supply of a detected circuit is disconnected, the zero line is disconnected, the detected wire and the test rod of the electrode clamp unit are contacted with the live wire of the power supply, and then the leakage current value can be read from the clamp meter; the method is also suitable for detection of circuits containing iron cores.

Each connecting lead 3.2 is provided with an unreeling component 3.3, the connecting leads 3.2 are wound on the unreeling component 3.3, the unreeling component 3.3 comprises two baffle plates 3.4, a winding drum 3.6 and a rotary return spring 3.7, the two baffle plates 3.4 are oppositely arranged, a connecting rod 3.5 is arranged between the two baffle plates 3.4 (the connecting rod 3.5 is fixed on the baffle plate 3.4 through a bolt), two ends of the connecting rod 3.5 are respectively fixed with the baffle plates 3.4, a winding drum 3.6 is sleeved on the connecting rod 3.5, so that the winding drum 3.6 rotates on the connecting rod 3.5, a rotary return spring 3.7 is arranged between the winding drum 3.6 and one of the baffle plates 3.4 in a welding mode (the return winding of the winding drum 3.6 is realized through the rotary return spring 3.7), one end of each connecting lead 3.2 penetrates through the baffle plate 3.4 to be connected on the induction coil 2, the connecting leads 3.2 are fixed on the winding drum 3.6 through glue, two limiting rods 8 are arranged between the two baffle plates in a parallel mode, another one end alternate of connecting wire 3.2 is between two gag lever posts 3.8, and electrode holder 3.1 can't pass two gag lever posts 3.8 with measuring the stick, pulls out connecting wire 3.2 when carrying out work like this, on being surveyed the circuit with electrode holder 3.1 and measuring stick access like this, when need not to carry out work, and the rolling subassembly will be connecting wire 3.2 rolling, is convenient for like this accomodate and unreel.

Claims

1. The utility model provides a low pressure leakage current detection device, includes pincerlike meter, induction coil and docking mechanism, its characterized in that, wherein pincerlike meter's the card of keeping silent on induction coil, is connected with docking mechanism on induction coil, directly inserts induction coil to detection circuitry through docking mechanism.

2. A low-voltage leakage current detection device according to claim 1, wherein the docking mechanism comprises a test bar, an electrode clamp and a connecting wire, wherein the electrode clamp and the test bar are respectively connected with the connecting wire, the connecting wire is connected with the induction coil, and the induction coil is connected into the detection circuit through the electrode clamp, the test bar and the connecting wire.

3. A low-voltage leakage current detection device according to claim 1 or 2, wherein the number of the induction coils is plural, each induction coil is composed of a plurality of turns of coils, an insulating layer is wrapped on each induction coil, a splicing joint spliced with other coils is arranged on each induction coil, the plurality of induction coils can be connected in series through the splicing joint, and meanwhile, the splicing joint of the induction coil is connected with the connecting lead wire quickly.

4. The low-voltage leakage current detection device according to claim 3, wherein an unwinding assembly is arranged on each connecting wire, the connecting wires are wound on the unwinding assembly, the unwinding assembly comprises two baffles, a winding drum and a rotary return spring, the two baffles are arranged oppositely, a connecting rod is arranged between the two baffles, two ends of the connecting rod are respectively fixed with the baffles, the winding drum is sleeved on the connecting rod and rotates on the connecting rod, the rotary return spring is arranged between the winding drum and one of the baffles, one end of each connecting wire penetrates through the corresponding baffle and is connected to the corresponding induction coil, two parallel limiting rods are arranged between the two baffles, the other end of each connecting wire penetrates between the two limiting rods, and the electrode clamp cannot penetrate through the two limiting rods.