CN205844441U - Detection device is run in a kind of power equipment lost territory - Google Patents

Abstract

The utility model is applicable to the field of electric power system, and provides a detection device for groundless operation of electric equipment, which includes a detection box body, a box cover is connected to a rotating shaft on the back of the box body, an operation panel is fixed on the box body, and an operation panel is mounted on the operation panel. Positive and negative current connection pins, positive and negative voltage connection pins, and grounding connection pins are provided. The operation panel is also provided with a display screen, buttons, mains socket and resistance display panel, and a circuit board is provided in the box. The device can simply and accurately detect whether the power equipment is running without ground, can ensure the safe and reliable operation of the power grid, greatly reduces the loss caused by the ground grid or the heavy loss caused by the equipment running without ground, and ensures the safety of the power system. Safe operation has huge social value and economic value.

Description

A detection device for ground-lost operation of electric equipment

technical field

The utility model belongs to the technical field of electric power systems, in particular to a detection device for ground-lost operation of electric equipment.

Background technique

The grounding down conductor of the power equipment plays the role of connecting the power equipment with the grounding network, which is very important to the safety of the equipment operation. The ground loss operation of equipment refers to the defects in the grounding grid and equipment grounding down-conductor in the construction of infrastructure or the grounding device in operation is located in the soil, which is corroded due to the long-term influence of physical and chemical factors, making it unable to meet the design requirements. The minimum cross-section of the grounding wire or the resistance of the soldering point increases.

In power plants, large and large substations in the power system, each operating equipment has one or more down-conductors connected to the grounding grid, and each grounding down-conductor should be connected to the grounding grid in accordance with the guidelines. Check, measure its on-resistance value, and record it for comparison over the years, so as to determine the operating status and decide whether to dig out the inspection. The workload is indeed very large. Therefore, it is necessary to find a more convenient on-site detection method.

The following disadvantages exist in the detection and transformation of this work by the national power system:

1. The power supply company lacks a clear understanding of the actual conditions of the grounding devices and down-conductors of the substations under its jurisdiction, and it is difficult to assess the defects, so that it is impossible to determine the substations that need to be transformed. In the case of limited funds, it is difficult to determine the order of transformation.

2. Without more convenient and accurate measuring equipment, it is impossible to complete the "conduction detection of the down conductor of the grounding device once a year" stipulated by the national standard. There is also an annual original test record. Before a problem occurs, it is difficult to analyze and judge, and record the thickness and age of corrosion.

3. The detection method commonly used by the power supply bureau is to use a multimeter and other similar instruments to measure the grounding down-conductor of the equipment. Elimination, the DC measurement resistance method cannot eliminate the DC component in the running ground network, etc.) can only be used as a simple means of preliminary characterization, and cannot complete the substantive inspection.

4. Measure the on-off of the underground part of the grounding down-conductor through the meter. Due to the measurement accuracy and other reasons, its state cannot be determined.

5. Failure to use more convenient measuring equipment and better measuring methods is also one of the existing problems. Many operating units mention the completion of this work, but feel that the workload is too large and cannot be completed.

Because there are so many shortcomings, there is an urgent need for an instrument that can accurately determine the defects of grounding down conductors.

Utility model content

In view of the above problems, the purpose of this utility model is to provide a detection device for ground-lost operation of electric equipment, which aims to solve the technical problems of low detection accuracy and heavy workload of existing electric equipment.

The utility model adopts the following technical solutions:

The power equipment loss-of-ground operation detection device includes a detection box body, a box cover is connected to the rotating shaft on the back of the box body, an operation panel is fixed on the box body, and a positive current connection pin and a negative current connection pin are arranged on the operation panel. , a positive voltage connection pin, a negative voltage connection pin and a ground connection pin, the operation panel is also provided with a display screen, buttons, mains socket and a resistance display panel, and a circuit board is provided in the box, and the circuit board It includes a power supply output circuit, an ammeter module, a voltmeter module, a single-chip microcomputer and a numerical output module. The positive current connection pin, the ammeter module, the power output circuit, and the negative current connection pin are connected in sequence, and the voltmeter module is connected to the Between the positive voltage connection pin and the negative voltage connection pin, the positive voltage connection pin is connected to the positive current connection pin, the negative voltage connection pin is connected to the negative current connection pin, and the numerical output modules are respectively connected to The voltmeter module is connected to the ammeter module, the single-chip microcomputer is connected between the power supply output circuit and the numerical output module, and the display screen and the resistance display panel are connected to the single-chip microcomputer.

Further, the buttons include a power switch button, a measurement start button and a reset button.

Further, handles are provided on both sides of the operation panel.

Further, the detection box is divided into an upper box and a lower box, and the upper and lower boxes are connected by a rotating shaft at the back, the circuit board is fixed in the upper box, and a connecting wire is placed in the lower box. The front panel of the lower box body is also connected with two buckle plates by the rotating shaft. When the buckle plates rotate upwards, they can just buckle the edge of the upper box body.

Further, the power output circuit includes a mains power access module, a transformer, an electronically controlled switch, and an interface output module connected in sequence, and the single-chip microcomputer is connected to the electronically controlled switch

The beneficial effects of the utility model are: the device can simply and accurately detect whether the power equipment is running without ground, can ensure the safe and reliable operation of the power grid, and greatly reduce the loss caused by the ground grid or the belt loss caused by the equipment running without ground. It has huge social value and economic value to ensure the safe operation of the power system.

Description of drawings

Fig. 1 is a structural diagram of a detection device for ground-lost operation of electric equipment provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of a detection device for ground-lost operation of electric equipment;

Fig. 3 is another schematic diagram of the detection device for ground-lost operation of electric equipment.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

In order to illustrate the technical solution described in the utility model, the following specific examples will be used for illustration.

Fig. 1 shows the structure of the detection device for power equipment running out of ground provided by the embodiment of the utility model, and only shows the parts related to the embodiment of the utility model for convenience of description.

As shown in Fig. 1, the power equipment loss-of-ground operation detection device provided by this embodiment includes a detection box 1, a box cover 2 is connected to the rotating shaft on the back of the box, and an operation panel 3 is fixed on the box 1. The operation The panel 3 is provided with a positive current connection pin I+, a negative current connection pin I-, a positive voltage connection pin U+, a negative voltage connection pin U-, and a ground connection pin GND. The operation panel is also provided with a display screen 31, buttons 32. The mains socket 33 and the resistance display panel 35. The buttons 32 include a power switch button, a measurement start button and a reset button. Described casing 1 is provided with circuit board (shown in the figure), as shown in Figure 2, described circuit board comprises power supply output circuit 4, ammeter module 5, voltmeter module 6, single-chip microcomputer 7 and numerical value output module 8. Handles 34 are also provided on both sides of the operation panel 3 .

The positive current connecting pin, the ammeter module, the power output circuit, and the negative current connecting pin are connected in sequence, the voltmeter module is connected between the positive voltage connecting pin and the negative voltage connecting pin, and the positive voltage connecting pin connected to the positive current connecting pin, the negative voltage connecting pin is connected to the negative current connecting pin, the numerical output module is respectively connected to the voltmeter module and the ammeter module, and the single-chip microcomputer is connected to the power supply Between the output circuit and the numerical output module, the display screen is connected to the single-chip microcomputer.

Before measurement, take two connecting wires, red and black. One end of the connecting wire is a clamp, and the other end is divided into two connecting heads. Connect the two connectors of the red connecting wire to the positive voltage connecting pin and the positive current connecting pin respectively, and connect the two connectors of the black connecting wire to the negative voltage connecting pin and the negative current connecting pin respectively. Then clamp the clamps of the red and black connecting wires to the grounding connection posts to be tested respectively. Assume that the resistance between the grounding connection posts is expressed as Rx. According to Figure 2, after power-on, the ammeter module can obtain the Rx current and voltage. The meter module can obtain the Rx voltage, and then the numerical output module can calculate the Rx resistance value according to the Rx current and voltage, and then output it to the single-chip microcomputer. The single-chip microcomputer is connected to the resistance display panel, and the tester can directly read the resistance value. According to the Rx resistance value, the current grounding condition of the electric equipment can be known, and whether the ground is lost can be judged.

As a preferred implementation, since the measurement of the resistance display panel is limited, and the output current of the power output circuit is constant, when the Rx resistance is relatively large, the current flowing through Rx is very small, and the ammeter module obtains the current The error of the data is relatively large, and the Rx resistance error obtained by dividing the voltage by the current is very large. To solve this problem, the numerical output module detects that the Rx current is very small, and sends a signal instruction to the microcontroller, and the microcontroller controls the power supply to output power adaptively. Voltage output, increase the voltage output, so that the Rx current reaches an appropriate value, so that the final calculated Rx result is in line with reality. At the same time, the display screen displays the current voltage output. In this preferred mode, as shown in FIG. 3 , the power output circuit 4 includes a mains power access module 41, a transformer 42, an electric control switch 43, and an interface output module 44 connected in sequence, and the single-chip microcomputer 7 is connected to the The electric control switch 43 described above. By controlling the connection of the electronically controlled switch by the single-chip microcomputer, the connection turns ratio of the transformer can be controlled, and the voltage output of the transformer can be changed.

Further, the detection box 1 is divided into an upper box 11 and a lower box 12, the upper and lower boxes are connected by a rotating shaft at the back, the circuit board is fixed in the upper box 11, and the lower box 11 is also Connecting wires (not shown) are placed, and two pinch plates 13 are connected to the front panel of the lower box by a rotating shaft. When the pinch plate 13 turns upwards, it can just buckle the edge of the upper box body. After opening the box cover, if you want to take out the connecting wire, you can directly buckle the two buckle plates and turn the upper box body. After the measurement is completed, store the connecting wires in the lower box, then buckle the gusset, and then close the box cover, the gusset will not be buckled, and the upper and lower boxes will not be separated.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (5)

1. detection device is run in a power equipment lost territory, it is characterised in that described device includes detecting casing, and described casing is carried on the back Face rotating shaft connects case lid, and described casing is fixed with guidance panel, described guidance panel is provided with positive pole electric current connecting pin, Cathodal current connecting pin, cathode voltage connecting pin, negative voltage connecting pin and a grounding connection foot, on described guidance panel also Being provided with display screen, button, city's electrical outlet and resistance display panel, be provided with circuit board in described casing, described circuit board includes Power output circuit, galvanometer module, voltameter module, single-chip microcomputer and value output module, described positive pole electric current connecting pin, Galvanometer module, power output circuit, cathodal current connecting pin are sequentially connected with, and described voltameter module is connected to described positive electrical Pressure is between connecting pin, negative voltage connecting pin, and described cathode voltage connecting pin is connected with described positive pole electric current connecting pin, described negative pole Voltage connecting pin is connected with described cathodal current connecting pin, and described value output module is respectively at described voltameter module and electric current Meter module connects, and described single-chip microcomputer is connected between described power output circuit and value output module, described display screen, resistance Display panel is connected to described single-chip microcomputer.

2. detection device is run in power equipment lost territory as claimed in claim 1, it is characterised in that described button includes on and off switch Button, measurement start button and reset key.

3. detection device is run in power equipment lost territory as claimed in claim 1, it is characterised in that described guidance panel both sides also set It is equipped with handle.

4. detection device is run in power equipment lost territory as claimed in claim 1, it is characterised in that described detection casing is divided into top box Body and lower box, the rotating shaft overleaf of upper lower box connects, and described circuit board is fixed in described upper box, in described lower box also Being placed with connecting line, on the front panel of described lower box, also rotating shaft connection has two blocks of buckles, when described buckle is rotated up permissible Just clasp described upper box edge.

5. detection device is run in power equipment lost territory as described in any one of claim 1-4, it is characterised in that described power supply exports Civil power AM access module that circuit includes being sequentially connected with, transformator, automatically controlled switching switch, interface output module, described single-chip microcomputer is even It is connected to described automatically controlled switching switch.