CN201273929Y - Test instrument for wire grounding failure - Google Patents

Abstract

The utility model discloses a line grounding fault tester, which comprises a casing on which a detection device, a power switch, an adjustment switch and a measuring instrument are installed, a power supply and a control circuit board are installed in the casing, and a pulse timer is installed on the control circuit board And high-power loads, the control circuit board is connected to the detection device, power switch, adjustment switch and measuring instrument through wires. The utility model has the advantages of: using the principle of zero-sequence current amplification, the leakage current of the grounding fault point is artificially amplified to become an obvious, comparable and intuitive leakage current, thereby realizing the purpose of accurate detection and sensitive response; it can be directly detected Leakage phenomenon, no need to stop production, so as to ensure the continuity of production and improve production efficiency; simple and reasonable structure, easy to carry; low production cost, suitable for large-scale promotion, etc.

Description

Line Ground Fault Tester

technical field

The utility model belongs to the field of electric circuit fault detection devices, in particular to a circuit grounding fault tester.

Background technique

In most industrial and mining enterprises, due to the poor on-site environment, on-site electrical equipment, such as: motors, electric welding machines, lighting devices, etc., are prone to ground faults. In the neutral point grounding system, when a ground fault occurs, since the neutral line is grounded, when a certain phase is grounded, it is equivalent to a short circuit with the neutral line, which will cause the switch to trip, and the ground fault of the road will be automatically exposed. However, the neutral point of the low-voltage system of some factories is not grounded. In the low-voltage neutral point ungrounded system, the grounding voltmeter in the power distribution room will show a grounding voltage. When the field equipment is grounded, the grounding voltage will reach 220V. Crisis equipment and Personal safety has a greater impact on production. In the past, when this kind of problem occurred, the method of pulling and closing the switch was often used to find it. This method is difficult to implement. For example, for a type of load production enterprise, when the power failure is performed to find the grounding of the production, it will often cause serious losses, especially for production. For enterprises with strong continuity, once a piece of equipment is stopped, it will have a great impact on the end product.

Contents of the invention

The utility model provides a line grounding fault tester, which can solve the deficiencies in the known technology. The measuring principle is simple, the production cost is low, the accuracy is high, the response is sensitive, and the line grounding fault can be tested without stopping production. detection.

In order to achieve the above object, the utility model is realized through the following technical solutions: the line grounding fault tester includes a housing, a detection device, a power switch, an adjustment switch and a measuring instrument are installed on the housing, a power supply and a control circuit board are installed in the housing, and the control A pulse timer and a high-power load are installed on the circuit board, and the control circuit board is respectively connected with the detection device, the power switch, the adjustment switch and the measuring instrument through wires. The detection device is a digital clamp ammeter. The detection device is a pointer ammeter. A hanging ring is arranged on one side of the housing.

The utility model has the advantages of: using the principle of zero-sequence current amplification, the leakage current of the ground fault point is artificially amplified, and becomes an obvious, comparable and intuitive leakage current, thereby realizing the purpose of accurate detection and sensitive response; it can be directly detected Leakage phenomenon, no need to stop production, so as to ensure the continuity of production and improve production efficiency; simple and reasonable structure, easy to carry; low production cost, suitable for large-scale promotion, etc.

Description of drawings

Accompanying drawing 1 is a schematic diagram of the front view of the utility model; Accompanying drawing 2 is a partial sectional view of accompanying drawing 1;

Detailed ways

The utility model is further described in detail in conjunction with the accompanying drawings.

The line grounding fault tester described in the utility model includes a housing 1 . The casing 1 can protect and modify the entire device. A detection device 3 , a power switch 4 , an adjustment switch 2 and a measuring instrument 5 are installed on the casing 1 . The detection device 3 is used to measure the zero-sequence current or ground phase current on each line. The adjustment switch 2 can control the range of current, voltage or resistance output by the detection device, so as to adapt to different working ranges and occasions. The measuring instrument 5 can display the detection result of the detection device 3, which is convenient for the operator to intuitively and accurately judge whether there is a line grounding fault. A power supply 7 and a control circuit board 6 are installed in the casing 1, and a pulse timer 9 and a high-power load 8 are installed on the control circuit board 6. The pulse timer 9 can transmit the voltage pulse between the neutral line and the ground line to the high-power load 8, thereby artificially increasing the leakage current at the fault point, so that the detection device 3 can directly and quickly detect the ground voltage and ground current. The function of the high-power load 8 is to amplify the leakage current at the fault point. The control circuit board 6 is respectively connected with the detection device 3, the power switch 4, the adjustment switch 2 and the measuring instrument 5 through wires.

The structure of the utility model embodiment 1 is: the detection device 3 is a digital clamp ammeter. The digital clamp ammeter can measure the grounded phase current and other phase currents. According to the comparison of the values, it can be determined whether the faulty line is grounded or not.

The structure of the utility model embodiment 2 is: the detection device 3 is a pointer type ammeter. The pointer ammeter can be used to measure the zero sequence current of the cable

In order to carry the utility model conveniently, a hanging ring 10 is arranged on one side of the housing 1 .

Claims (4)

1. The line grounding fault tester is characterized in that: it comprises a housing (1), and a detection device (3), a power switch (4), an adjustment switch (2) and a measuring instrument (5) are installed on the housing (1), A power supply (7) and a control circuit board (6) are installed in the housing (1), a pulse timer (9) and a high-power load (8) are installed on the control circuit board (6), and the control circuit board (6) is respectively It is connected with the detection device (3), the power switch (4), the adjustment switch (2) and the measuring instrument (5). 2. The line ground fault tester according to claim 1, characterized in that the detection device (3) is a digital clamp ammeter. 3. The line ground fault tester according to claim 1, characterized in that the detection device (3) is a pointer ammeter. 4. The line ground fault tester according to any one of claims 1, 2, 3 or 4, characterized in that a hanging ring (10) is provided on one side of the housing (1).

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