CN105467164A - A discharging rod special-purpose case with an electrical test apparatus - Google Patents

Abstract

A special box for discharge rods with an electrical test device, which mainly includes a box body, and at least the following four spaces are separated in the box: a space for placing discharge rods, a space for placing test lines, a space for placing test clips and test inserts, and Detecting instrument placement space; two 10KV discharge rods are placed in the strip-shaped discharge rod storage space, and the high-voltage and grounding metal ends of the 10KV discharge rods are respectively snapped into U-shaped metal slots installed at the bottom of the box , and the metal slots are respectively connected to the testing instruments in the testing instrument placement space; it has the characteristics of simple structure, convenient operation and use, good safety, and can better avoid safety hazards to people and equipment.

Description

A special box for discharge rod with electrical test device

technical field

The invention relates to a special box for discharge rods with an electrical test device, which belongs to the technical field of safety detection of electric facilities or equipment.

technical background

During the high-voltage test of the power system, in the process of removing or replacing the connection mode of the test line, the discharge rod must be used to fully discharge the tested equipment, otherwise, it will cause huge safety hazards to equipment and personnel, endangering life and equipment. safety. Therefore, the integrity of the discharge rod is very important for the power system test work. However, the existing discharge rods do not have special discharge boxes for their proper placement, so that the discharge rods are easily damaged during transportation.

Before using the discharge rod, it must be ensured that the size of its discharge resistance meets the specified requirements, and the grounding wire of the discharge rod is well connected. Only in this way can a sufficient discharge be performed on the tested equipment to ensure the safety of people and equipment. At present, the high-voltage test discharge rod adopts the method of regular inspection to check whether its working performance meets the work requirements, but the regular inspection method has a long detection period. The personnel cannot find out in time that the high-voltage test discharge rod will not be able to complete the discharge work and reliable grounding of the high-voltage equipment, which will easily cause serious safety hazards. Judging the quality of the test line will easily cause unnecessary errors in the test data of the electrical test, causing personal and equipment safety hazards. Therefore, how to store the discharge rod better, and carry out a timely detection to the discharge rod and its attached grounding wire and test wire are problems that need to be solved urgently.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a special discharge rod with an electrical test device that is simple in structure, easy to operate, good in safety, and can better avoid safety hazards to people and equipment. box.

The object of the present invention is accomplished through the following technical scheme, a special box for discharge rods with an electrical test device, which mainly includes a box body, and at least the following four spaces are arranged in the box: space for placing discharge rods, test Line placement space, test clip and test insert placement space, and testing instrument placement space; two 10KV discharge rods are placed in the strip-shaped discharge rod placement space, and the high voltage and grounding metal ends of the 10KV discharge rods are respectively It is clamped in the U-shaped metal card slot installed at the bottom of the box body, and the metal card slots are respectively connected with the testing instruments in the space where the testing instruments are placed.

As a preference: the detection instrument is composed of a display screen, buttons, and a resistance measuring circuit, and has a built-in 12V rechargeable power supply; the 12V rechargeable power supply outputs a test current through a current-limiting constant voltage source, and passes through the connected current The sampling resistor automatic switching mechanism is connected to the measurement channel; the measurement channel has five channels and corresponds to five sets of output terminals on the panel respectively; the measurement circuit includes a receiving circuit to collect the voltage and current signals and perform analog-to-digital conversion. An ARM controller for signal processing, the ARM controller is externally connected with buttons, a liquid crystal display and an audible and visual alarm.

As a preference: the analog-to-digital converter mainly includes an AD7799 chip, and a differential operational amplifier AD8253 is connected in front of the analog-to-digital converter; the analog-to-digital converter is transmitted to the ARM controller through an SPI serial interface.

The invention has the characteristics of simple structure, convenient operation and use, good safety, and can better avoid safety hazards to people and equipment.

Description of drawings

Fig. 1 is a structural schematic diagram of the special case for discharge rods according to the present invention.

Fig. 2 is a schematic diagram of the electric test circuit of the present invention.

Fig. 3 is a schematic diagram of the auxiliary power supply and power supply control of the present invention.

Fig. 4 is a circuit schematic diagram of the voltage and current signal sampling channel of the present invention.

Fig. 5 is a circuit schematic diagram of the ARM controller of the present invention.

Fig. 6 is a schematic diagram of the current output loop of the present invention.

Fig. 7 is a block diagram of the electrical test work process of the present invention.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings: As shown in Figure 1, a special box for discharge rods with an electrical test device according to the present invention mainly includes a box body 1, which is equipped with a box cover. There are at least the following four spaces in the body 1: a space for placing the discharge rod 2, a space for placing the test line 3, a space for placing the test clip and the test insert 4, and a space for placing the testing instrument 5; Two 10KV discharge rods 6 are placed in the space 2. The high voltage and grounding metal ends of the 10KV discharge rods 6 are respectively clamped in the U-shaped metal slots installed at the bottom of the box, and the metal slots are respectively connected to the detection instrument. The detection instrument 7 in the placement space 5 is connected.

As shown in Fig. 2, the described testing instrument 7 is made up of display screen 8, button 9, resistance measurement circuit, and built-in 12V rechargeable power supply, comprises battery charger 10, 12V battery 11 and auxiliary power supply 12; The charging power supply outputs the test current through a current-limiting constant voltage source 13, and is connected to the measurement channel 15 through the connected current sampling resistor automatic switching mechanism 14; the measurement channel 15 has five channels and corresponds to five groups of outputs on the panel Terminal 16; the measurement circuit includes an ARM controller 18 that receives the voltage and current signals collected by the circuit and performs signal processing after the analog-to-digital conversion circuit 17, and the ARM controller 18 is externally connected with a button 9, a liquid crystal display 8 and Sound and light alarm, including buzzer 19. Fig. 2 also includes a relay control 20, a USB interface 21, an indicator light 22 and the like.

The analog-to-digital converter of the present invention mainly includes an AD7799 chip, and a differential operational amplifier AD8253 is connected in front of the analog-to-digital converter; the analog-to-digital converter is transmitted to the ARM controller through an SPI serial interface.

Embodiment: As shown in Figure 1, the electrical (high voltage) test discharge rod multifunctional special box of the present invention is divided into 4 blocks, discharge rod placement area 2, test line placement area 3, test clips and test inserts placement Zone 4 and the testing instrument placement area (placement space), the size of the box is moderate and should not be too high.

Discharge rod placement area 2 places two 10kV discharge rods side by side, which requires compactness. At the same time, the high-voltage and grounding metal ends of the discharge rods are inserted into the U-shaped metal slot installed at the bottom of the box. The size of the discharge resistor of the rod.

The area where the test clips and test inserts are placed should be closely attached to the upper cover of the box to prevent small objects such as clips from being scattered around during the movement of the box.

The detection instrument is composed of 128*64 display screen, buttons, and resistance measurement circuit. It is powered by a built-in 12V battery and provides resistance measurement of 5 sets of connecting wires. You can set the resistance over-limit threshold, when the resistance is greater than the threshold, the instrument will give an audible and visual reminder.

As shown in Figure 2, the detection instrument uses a 12V battery, which can be charged by an external battery charger. The 12 batteries pass through a current-limiting constant voltage source, output a maximum test current of 0.5A, and a maximum output voltage of 12V. 1mΩ-100MΩ resistance measurement. There are five measurement channels in total, corresponding to five sets of output terminals on the panel. The voltage and current signals collected by the circuit are transmitted to the ARM controller through analog-to-digital conversion for signal processing. The ARM module realizes the calculation of the resistance and the switching of the measurement channel. The calculated resistance value can be displayed on the liquid crystal display. If the resistance value exceeds the standard, it can also realize the sound and light alarm. ARM controllers can be programmed via keystrokes.

As shown in Figure 3, the auxiliary power supply and power supply control are: the battery voltage +12B is supplied to the circuit board through the panel switch, and Q1, R8, E4, R9, Q2, R11, and R12 form a soft switch. When the battery voltage is detected to be too low, it is controlled by The main controller pulls the PWON signal high to automatically power off. The latter stage consists of two voltage stabilizing modules, U2-LM2576 and U3-1117, which respectively generate auxiliary power supplies of +5V and +3.3V to supply the components in the circuit.

As shown in Figure 4, the voltage and current signal sampling channel is: the sampled voltage and current signals are output to the serial analog-to-digital converter AD7799 through the differential operational amplifier AD8253, and the conversion results are transmitted to the main control through the SPI serial interface device for calculation and processing.

As shown in Figure 5, the described ARM controller is: the main controller is STM32F103VBT6, which is a high-performance 32-bit ARM processor, works at a high-speed main frequency of 72MHz, has powerful functions and low cost, and is very suitable for various in complex control applications.

As shown in Figure 6, the current output circuit is: +12V voltage, the five test channels of the panel are respectively connected to the measurement circuit through K2, K4, K6, K7, and K8 relays, and Q3, R22, R23, R24, The current limiting circuit composed of D6 limits the output current within 0.5A. Relays K1, K3, and K5 switch current sampling resistors of 1Ω, 100Ω, and 10kΩ to adapt to different load conditions and ensure test accuracy.

As shown in Fig. 7, the working process of the present invention is: start the machine to display the general menu, enter the button scanning program, and wait for further operations. When clicking the menu to measure, first turn on the power output, then measure the channel voltage and current signal, then calculate the loop resistance, then switch channels in turn, measure the loop resistance of each channel, and finally display the loop of each channel on the display The resistance value is compared with the set threshold resistance. When the resistance value exceeds the limit, an audible and visual prompt will be issued.

Claims (3)

1. A special box for discharge rods with an electrical test device, which mainly includes a box body, and at least the following four spaces are separated in the box: space for placing discharge rods, space for placing test lines, placing test clips and test inserts It is characterized in that two 10KV discharge rods are placed in the elongated discharge rod placement space, and the high voltage and grounding metal ends of the 10KV discharge rods are respectively clamped to the bottom of the box. U-shaped metal slots, and the metal slots are respectively connected to the testing instruments in the testing instrument placement space. 2. The special box for discharge rods with electrical testing device according to claim 1, characterized in that the detection instrument is composed of a display screen, buttons, and a resistance measurement circuit, and has a built-in 12V rechargeable power supply; the 12V The rechargeable power supply outputs the test current through a current-limiting constant-voltage source, and is connected to the measurement channel through the connected current sampling resistor automatic switching mechanism; the measurement channel has five channels and corresponds to five groups of output terminals on the panel; the measurement The circuit includes an ARM controller that receives the voltage and current signals collected by the circuit and performs signal processing after an analog-to-digital conversion circuit. The ARM controller is externally connected with buttons, a liquid crystal display and an audible and visual alarm. 3. The special case for discharge rods with electrical testing device according to claim 2, characterized in that said analog-to-digital converter mainly includes an AD7799 chip, and the front of the analog-to-digital converter is connected with a differential operational amplifier AD8253; The analog-to-digital converter is sent to the ARM controller through an SPI serial interface.