Pole tower grounding current positioning device

Abstract

A tower grounding current positioning device provided by the present invention comprises an insulation disc, a plurality of groups of current detectors and ammeters are fixed on the insulation disc, and each current detector comprises a ground current test probe and a current transformer. The earth current test probe comprises two metal probes which are vertically inserted into the ground and a connecting metal rod which is connected with the two metal probes, the primary side of the current transformer is directly sleeved in the connecting metal rod, and the dotted terminals of the secondary sides of the current transformers of the plurality of groups of current detectors are connected in parallel and then are connected with the ammeter. The insulating disc is provided with a notch for clamping a tower, and a hydrogen sensor is arranged on the insulating disc. The device has the capability of visually detecting whether the electric power tower is grounded or not.

Description

Technical Field

[0001] The invention relates to the technical field of electric power instruments, in particular to a tower grounding current locating device. Background Art

[0002] The difficulty in finding single-phase grounding in 10kV to 35kV power systems has always been a major problem that plagues the operation of distribution networks. Whether it is arc suppression coil grounding or low-resistance grounding, there will be fault points that are difficult to find by conventional patrol means, resulting in troublesome fault handling, frequent power transmission failures and other serious problems. In response to this problem, some units have developed grounding search instruments based on the fifth harmonic method or signal injection principle. However, the grounding search equipment in the existing technology generally has problems such as inaccurate positioning accuracy, difficulty in finding high-resistance grounding, and dangerous injection signals, which greatly restricts the promotion and use. Some more advanced fault indicators now also have grounding indication functions, but fault indicators cannot be installed densely. For lines with many cable outlet branches or long distances, the help for on-site search is still limited. The most intuitive and effective method for grounding search is to directly detect the grounding current of the tower, but the flexible clamp meter in the existing technology cannot detect the diameter of the pole, and the detection sensitivity is low, only 0.1A, and cannot detect the leakage current of high-resistance grounding or insulation weak points, which is of limited significance for single-phase grounding search. The existing technology relies on a flexible clamp meter, which is not long enough to surround the entire pole, and therefore cannot sensitively detect whether there is a ground fault on the upper components of the pole. Summary of the invention

[0003] The present invention solves the problem that the flexible clamp meter in the prior art has low detection sensitivity and cannot detect leakage current at high-resistance grounding or insulation weak points, and proposes a tower grounding current locating device that has the ability to intuitively detect whether a power tower is grounded.

[0004] In order to achieve the above objectives, the following technical solutions are proposed: A tower grounding current positioning device comprises an insulating disk, on which a plurality of groups of current detectors and ammeters are fixed, the current detectors comprising an earth current test probe and a current transformer, the earth current test probe comprising two metal probes vertically inserted into the ground and a connecting metal rod connecting the two metal probes, the primary side of the current transformer is directly inserted into the connecting metal rod, the secondary side same-name ends of the current transformers of the plurality of groups of current detectors are connected in parallel and then connected to the ammeter, the insulating disk is provided with a notch for clamping the tower, and a hydrogen sensor is provided on the insulating disk.

[0005] The present invention combines current phase detection with gas generation by ground current electrolysis to detect 50 mA of tower ground current, providing a convenient and feasible solution for sensitively discovering whether there are faults or insulation weaknesses in power towers.

[0006] Preferably, the main body of the insulating disc is a disc-shaped structure, with a notch radially opened from the center to the outer circle. The width of the notch is between 30 cm and 50 cm. The purpose of this setting in the present invention is to enable the insulating disc to have sufficient length to surround the entire electric pole and be able to sensitively detect whether there is a grounding fault in the upper components of the pole.

[0007] Preferably, the end of the metal probe is conical. The purpose of this setting in the present invention is to reduce the resistance when the metal probe is inserted into the soil, thus saving the user's effort.

[0008] Preferably, there are 4 groups of current detectors, and the 4 groups of current detectors are symmetrically arranged along the radial direction on the outside of the insulating disc. The present invention uses four symmetrically arranged detection probes on the insulating disc to measure the current direction in the earth soil. Through the connection of the same-name ends of the current transformers, when in use, as long as the detection disc is sleeved on the pole to be detected, if the current in the earth does not flow into this pole, the currents of the four detection probes cancel each other out, and their vector sum is zero, and the ammeter has no reading. If they all flow into this pole, the current vector sums are accumulated, and the ammeter can read a significant grounding current, and it can be intuitively obtained whether there is a grounding fault in the upper components of the pole.

[0009] Preferably, a resistance reducing agent injector is provided on the insulating disc, and the resistance reducing agent injector is used to inject the resistance reducing agent into the soil. Through the injection of the resistance reducing agent in the present invention, the soil resistivity of the detection area is further reduced, and the detection accuracy is improved.

[0010] Preferably, there are 2 resistance reducing agent injectors, which are symmetrically arranged at both ends of the insulating disc.

[0011] Preferably, the hydrogen sensor is of the soil insertion type and is arranged on the opposite side of the notch of the insulating disc. If the grounding is located on this pole, the soil current density is concentrated, and hydrogen can be collected in the soil. Generally, 50 mA of grounding current in the soil can significantly collect hydrogen. In this way, with the aid of the auxiliary judgment of the hydrogen sensor, it can be further clarified whether the grounding current flows back to this pole. The present invention can very sensitively detect whether there is a grounding current in the power pole and determine whether there is a grounding fault in the line pole.

[0012] The beneficial effects of the present invention are: The present invention combines current phase detection with the electrolysis of grounding current to generate gas, can detect the grounding current of 50 mA of the pole, and provides a convenient and feasible solution for sensitively discovering whether there are faults or insulation weak points in the power pole. Brief Description of the Drawings

[0013] Figure 1 is a structural schematic diagram of the embodiment; Figure 2 is a top view of the insulating disc of the embodiment; Among them, 1. Insulating disc; 2. Earth current test probe; 3. Current transformer; 4. Ammeter; 5. Resistance reducing agent injector; 6. Hydrogen sensor. Specific implementation mode

[0014] Embodiment: This embodiment provides a tower grounding current positioning device. Refer to Figure 1 and Figure 2 , including an insulating disc 1. A number of groups of current detectors and an ammeter 4 are fixed on the insulating disc 1. The current detectors include an earth current test probe 2 and a current transformer 3. The earth current test probe 2 includes two metal probes vertically inserted into the ground and a connecting metal bar connecting the two metal probes. The primary side of the current transformer 3 is directly sleeved on the connecting metal bar. The secondary side homonymous ends of the current transformers 3 of a number of groups of current detectors are connected in parallel and then connected to the ammeter 4. The insulating disc 1 is provided with a notch for clamping the tower. A hydrogen sensor 6 is provided on the insulating disc 1. The main body of the insulating disc 1 is of a disc-shaped structure, and a notch is opened radially from the center to the outer circle, and the width of the notch is between 30 cm and 50 cm. The end of the metal probe is conical. There are 4 groups of current detectors, and the 4 groups of current detectors are symmetrically arranged along the radial direction on the outside of the insulating disc 1. A resistance reducing agent injector 5 is provided on the insulating disc 1, and the resistance reducing agent injector 5 is used to inject the resistance reducing agent into the soil. There are 2 resistance reducing agent injectors 5, which are symmetrically arranged at both ends of the insulating disc 1. The hydrogen sensor 6 is of a soil-insertion type and is arranged on the opposite side of the notch of the insulating disc 1.

[0015] The specific principle is as follows: A tower grounding current positioning device includes an insulating disc 1, a ground current test probe 2, a current transformer 3, an ammeter 4, a resistance reducing agent injector 5, and a hydrogen sensor 6. The insulating disc 1 is of a disc-shaped structure with a diameter of 1 meter. There is a notch radially from the center to the outer circle of the insulating disc 1, and the width of the notch is between 30 - 50 cm. There are four ground current test probes 2, each with the same structure and in a U-shaped structure, with metal probes inserted into the ground at both ends. The four ground current test probes 2 are symmetrically arranged along the radial direction on the outside of the insulating disc 1. There are four identical current transformers 3, which are respectively arranged on the four ground current test probes 2. The primary side of the current transformer 3 is directly sleeved on the ground current test probe 2. After the secondary sides of the four current transformers 3 with the same name ends are respectively paralleled, they are connected to the ammeter 4. There are two identical resistance reducing agent injectors 5, which are respectively arranged at both ends of the insulating disc 1. The hydrogen sensor 6 is of a soil insertion type and is arranged on one side of the insulating disc 1. By using four symmetrically arranged detection probes on the insulating disc to measure the current direction in the earth soil, and connecting the same name ends of the transformers. When in use, as long as the detection disc is sleeved on the tower to be detected, if the current in the earth does not flow into this tower, the currents of the four detection probes cancel each other out and their vector sum is zero, and the ammeter has no reading. If all the currents flow into this tower, the current vector sum accumulates, and the ammeter can read a significant grounding current, thereby discovering whether the grounding fault occurs in this tower. Through the injection of the resistance reducing agent, the resistivity of the soil in the detection area is further reduced in the present invention. Subsequently, with the assistance of the hydrogen sensor for detection, if the grounding is located in this tower, the soil current density is concentrated and hydrogen can be collected in the soil. Generally, hydrogen can be significantly collected when there is a 50 mA grounding current in the soil. In this way, with the assistance of the hydrogen sensor for judgment, it can be further clarified whether the grounding current flows back to this tower. The present invention can very sensitively detect whether there is a grounding current in the power tower and determine whether there is a grounding fault in the line tower. The prior art relies on a flexible clamp meter, which cannot have a sufficient length to surround the entire electric pole, so it is impossible to sensitively detect whether there is a grounding fault in the upper components of the electric pole. The present invention combines current phase detection with the gas generated by the electrolysis of the grounding current, and can detect a 50 mA tower grounding current, providing a convenient and feasible solution for sensitively discovering whether there are faults or insulation weak points in the power tower.

[0016] It should be noted that the above embodiments are all for explaining the present invention rather than limiting the present invention. Many technical features in different embodiments of the present invention can be interchanged or omitted, and the settings of many components can be changed according to needs. The "a" or "one" before the components of the present invention does not exclude the occurrence of multiple such components, and these changes should all fall within the protection scope of the present invention.

Claims

1. A tower grounding current positioning device, characterized in that, it includes an insulating disc (1), on which several groups of current detectors and an ammeter (4) are fixed. The current detectors include a ground current test probe (2) and a current transformer (3). The ground current test probe (2) includes 2 metal probes vertically inserted into the ground and a connecting metal bar connecting the 2 metal probes. The primary side of the current transformer (3) is directly sleeved on the connecting metal bar. The secondary side homonymous ends of the current transformers (3) of several groups of current detectors are connected in parallel and then connected to the ammeter (4). The insulating disc (1) is provided with a notch for clamping the tower, and a hydrogen gas sensor (6) is provided on the insulating disc (1).

2. The tower grounding current positioning device according to claim 1, characterized in that, the main body of the insulating disc (1) is of a disc-shaped structure, and a notch is opened radially from the center to the outer circle, and the width of the notch is between 30 cm and 50 cm.

3. The tower grounding current positioning device according to claim 1, characterized in that, the ends of the metal probes are conical.

4. The tower grounding current positioning device according to claim 2, characterized in that, 4 groups of current detectors are provided, and the 4 groups of current detectors are symmetrically arranged along the radial direction on the outside of the insulating disc (1).

5. The tower grounding current positioning device according to any one of claims 1-4, characterized in that, a resistance reducing agent injector (5) is provided on the insulating disc (1), and the resistance reducing agent injector (5) injects the resistance reducing agent into the soil.

6. The tower grounding current positioning device according to claim 5, characterized in that, 2 resistance reducing agent injectors (5) are provided, and are symmetrically arranged at both ends of the insulating disc (1).

7. The tower grounding current positioning device according to any one of claims 1-4, characterized in that, the hydrogen gas sensor (6) is of a soil insertion type and is arranged on the opposite side of the notch of the insulating disc (1).

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