CN205015402U - Submersible pump cable insulation resistance measuring instrument - Google Patents

Abstract

The cable insulation resistance measuring instrument for the electric submersible pump comprises a shell, a single chip microcomputer, a liquid crystal display screen, a buzzing alarm, a keyboard, a direct-current high-voltage generator, a measuring interface, a communication interface and a power supply battery. The shell is rectangular, a measuring terminal and a buzzer alarm are arranged on the upper top surface of the shell, a communication interface is arranged on the side surface of the shell, a charging interface is arranged on the lower bottom surface of the shell, a liquid crystal display screen is arranged on the upper part of the front surface of the shell, a keyboard is arranged below the liquid crystal display screen, and three switching buttons of 500V, 1000V and 2500V are arranged on the keyboard; a singlechip, a communication module, a power supply battery and a direct current high voltage generator are arranged in the shell, the singlechip is respectively connected with the liquid crystal display screen, the keyboard, the high voltage direct current generator, the buzzer alarm and the communication module, and the communication module is connected with the communication interface; the power supply battery is respectively connected with the singlechip, the direct-current high-voltage generator and the charging interface, and the direct-current high-voltage generator is connected with the measuring terminal. The measurement of the insulation resistance of the cable of the electric submersible pump is accurate and convenient.

Description

Submersible pump cable insulation resistance measuring instrument

technical field

The utility model relates to a measuring instrument for the insulation resistance value of a submersible electric pump cable, which mainly solves the problem of time-consuming and laborious measurement of the cable insulation resistance value in the current submersible electric pump well operation.

Background technique

With the continuous improvement of oil production equipment and technology, the improvement of oil production efficiency has also paid more and more attention to various production links. Ensuring the insulation of cables in electric pump well operations is an important part of ensuring safe production. The insulation resistance meter is the insulation resistance measurement. important instruments. The insulation resistance meter is mainly composed of three parts: the first is the DC high voltage generator, which is used to generate DC high voltage; the second is the measuring circuit; the third is the display. The function is to measure the insulation resistance of the cable to the ground, and its scale unit is megohm. The insulation resistance measuring instrument currently used in oil production operations is a megger, commonly known as a shaker. The electric submersible pump cable is attached to the outside of the oil pipe, and friction with the outer wall is inevitable during the downhole operation. Due to the frictional damage of the outer layer of the cable insulation, the cable insulation resistance decreases. If the situation is serious, the well has just been completed, and the insulation has broken down before the start-up, and the pipe string has to be lifted again. The current practice is to stop the operation every ten oil pipes, and manually suppress and measure the insulation resistance. This not only affects the progress of the work, but also increases the workload, and it is impossible to achieve real-time measurement, and the data cannot be collected and transmitted.

Contents of the invention

The purpose of the utility model is to provide a submersible electric pump cable insulation resistance measuring instrument, which overcomes the above-mentioned defects in the prior art.

The technical scheme of the utility model is realized in the following ways:

The utility model comprises a shell, a single-chip microcomputer, a liquid crystal display, a buzzer alarm, a keyboard, a DC high voltage generator, a measurement interface, a communication interface and a power supply battery, and is characterized in that: the shell is set as a rectangle, and a measuring terminal and buzzer alarm, a communication interface is provided on the side of the housing, a charging interface is provided on the lower surface of the housing, a liquid crystal display is provided on the upper front of the housing, a keyboard is provided under the liquid crystal display, and a keyboard is provided on the keyboard. There are three conversion buttons of 500V, 1000V, and 2500V; there are single-chip microcomputer, communication module, power supply battery and DC high-voltage generator in the shell, and the single-chip microcomputer is connected with LCD screen, keyboard, high-voltage DC generator, buzzer alarm and communication respectively. The modules are connected, the communication module is connected with the communication interface; the power supply battery is connected with the single chip microcomputer, the DC high voltage generator and the charging interface respectively, and the DC high voltage generator is connected with the measuring terminal.

The communication module is set as a WLAN communication module, and the serial port complies with the MODBUS communication protocol.

The housing is made of non-magnetic stainless steel, and a strong magnetic steel adsorbed to the cable reel is arranged on the back or side of the housing.

The utility model has the following advantages:

1. The output voltage range of the instrument can be selected from 500V, 1000V and 2500V.

2. The output voltage is softly boosted, and the output voltage rises slowly from low to avoid the impact of ordinary megger directly outputting high voltage on the cable.

3. Output voltage protection function for low-resistance cables. For cables with less than 5MΩ, the output voltage rises to 250V and does not rise again, avoiding further damage to low-resistance cables that may be caused by the high voltage output of ordinary megohmmeters.

4. The device automatically amplifies the measurement signal by an appropriate multiple, so that the measurement value can maintain high precision between 0.5MΩ and 2500MΩ.

5. Automatically identify loose joints in the process of going into the well, and send out an alarm sound.

6. The instrument has three alarm values, which can be set according to the actual insulation value. When an alarm is triggered, there is an alarm sound output.

7. Pressing time and pressing interval can be set.

8. There is a WLAN communication module, and the serial port conforms to the MODBUS communication protocol.

9. Built-in rechargeable large-capacity battery, the output power of the whole machine is large.

10. The whole machine adopts stainless steel casing and portable design, which has certain antimagnetic and waterproof functions.

11. There is a strong magnetic steel on the machine shell, and the measuring instrument can be easily adsorbed on the cable reel.

Description of drawings

Fig. 1 - the structural representation of the utility model.

Fig. 2-circuit schematic diagram of the utility model.

In Figure 1, 1-measurement terminal, 2-charging interface, 3-housing, 4-keyboard, 5-LCD display.

detailed description

In order to further disclose the technical solution of the utility model, the following will be described in detail through the embodiments in conjunction with the accompanying drawings:

The utility model comprises a housing 3, a single-chip microcomputer, a liquid crystal display 5, a buzzer alarm, a keyboard 4, a DC high voltage generator, a measurement interface, a communication interface and a power supply battery, and is characterized in that: the housing 3 is set as a rectangle, and There are measuring terminals 1 and a buzzer alarm on the surface, a communication interface on the side of the shell, a charging interface 2 on the bottom of the shell, a liquid crystal display 5 on the upper front of the shell, and a liquid crystal display under the liquid crystal display. A keyboard 4 is provided, and three conversion buttons of 500V, 1000V, and 2500V are arranged on the keyboard; a single-chip microcomputer, a communication module, a power supply battery and a DC high-voltage generator are arranged in the housing, and the single-chip microcomputer is connected with the liquid crystal display, the keyboard, and the high-voltage DC generator respectively. The device, the buzzer alarm are connected with the communication module, and the communication module is connected with the communication interface; the power supply battery is respectively connected with the single chip microcomputer, the DC high voltage generator and the charging interface, and the DC high voltage generator is connected with the measurement terminal.

The working principle of the utility model is as follows: firstly, the single-chip computer controls the DC voltage generator to convert the electric energy of the power supply battery into a DC high voltage as a test voltage, and this test voltage is applied to the cable under test by the measurement circuit, The current is converted into a corresponding voltage value by the measurement circuit, and then converted into a digital signal by the analog-to-digital converter of the single-chip computer. The insulation resistance value of the cable is obtained through calculation and processing by the single-chip computer, and the corresponding insulation resistance value is displayed by the liquid crystal display module. The alarm will give an audible alarm to the abnormal condition of the insulation resistance, and at the same time, the measurement results will be sent to the designated computer through the communication interface. The keyboard input module is used to set parameters such as the alarm threshold and measurement time of the instrument.

Claims (3)

1. A kind of electric submersible pump cable insulation resistance measuring instrument, comprises housing, single-chip microcomputer, liquid crystal display, buzzer alarm, keyboard, DC high voltage generator, measuring interface, communication interface and power supply battery, it is characterized in that: housing The body is rectangular, with measuring terminals and a buzzer alarm on the upper surface, a communication interface on the side of the housing, a charging interface on the lower bottom of the housing, and a liquid crystal display on the upper front of the housing. There is a keyboard under the LCD screen, and three conversion buttons of 500V, 1000V, and 2500V are arranged on the keyboard; a single-chip microcomputer, a communication module, a power supply battery and a DC high-voltage generator are arranged in the housing, and the single-chip microcomputer is connected with the LCD screen and the keyboard respectively. , high-voltage DC generator, buzzer alarm and communication module, the communication module is connected to the communication interface; the power supply battery is connected to the single-chip microcomputer, the DC high-voltage generator and the charging interface, and the DC high-voltage generator is connected to the measurement terminal. 2. The electric submersible pump cable insulation resistance measuring instrument according to claim 1, characterized in that: the communication module is set as a WLAN communication module, and the serial port conforms to the MODBUS communication protocol. 3. The electric submersible pump cable insulation resistance measuring instrument according to claim 1, characterized in that: the housing is made of non-magnetic stainless steel, and a strong suction device attached to the cable reel is provided on the back or side of the housing. magnetic steel.