Ankerui Industrial Insulation Monitoring Instrument AIM-

Description :

　　The low-voltage system of offshore oil platforms is very different from that of onshore power systems. It belongs to the neutral point ungrounded system. In the event of a single-phase grounding fault, the system allows normal operation with the fault for 2 hours to ensure that important electrical equipment at sea will not be immediately shut down. Nowadays, most offshore platforms use insulation monitoring devices to monitor the insulation condition of the system. When there is a fault, an alarm is issued, but it cannot detect which load in the system has an insulation fault. Platform electrical personnel need to cut off the low-voltage load circuits on site one by one for fault diagnosis, which brings great difficulties to the search for grounding faults. When a single-phase grounding fault occurs in the low-voltage busbar, in order to lock the fault point in time and facilitate on-site electrical personnel to timely troubleshoot and solve the grounding fault, and improve the stability of the low-voltage system, an insulation monitoring and fault location system can be used to achieve the location of the insulation fault circuit and phase line.

Introduction to Industrial Insulation Monitoring DevicesAnkerui AIM-300, AIM-T500, AIM-T500L Insulation Monitoring Instruments

　　The Ankerui AIM-T series insulation monitoring instrument is mainly used in industrial IT distribution systems, including AIM-T300, AIM-T500, and AIMT500L products, all of which are suitable for pure AC, pure DC, and AC/DC wet combination systems.

　　The AIM-T300 is suitable for AC, DC, and AC/DC hybrid systems below 450V, while the AIM-T500 is suitable for AC, DC, and AC/DC hybrid systems below 800V.

　　The AIM-T500L has added one CAN communication interface and insulation fault location function compared to the AIM-T500.

1、 Product Overview

Insulation fault location industrial insulation monitoring deviceIt is mainly used to monitor the insulation condition of IT systems (ungrounded systems) to ground, and to promptly alarm when insulation faults occur in the system, reminding electrical maintenance personnel to troubleshoot the faults.

2、 Technical parameters

AIM-T300, AIM-T500, AIM-T500L Insulation Monitoring Instruments

ASG200 Test Signal Generator

AIL200-12 insulation fault locator

ACPD series insulation monitoring coupling instrument

3、 Specification parameters

4、 External dimensions

5、 Product quotation

6、 Application scope

Insulation fault location industrial insulation monitoring deviceSuitable for industrial fields such as electrolytic aluminum, mines, glass factories, electric furnaces and testing equipment, metallurgical plants, chemical plants, explosive hazardous areas, computer centers, and emergency power supplies in AC and DC ungrounded systems

　　The low-voltage power grid system of offshore oil platforms belongs to an independent power grid system. In order to ensure platform production, the low-voltage system of the platform cannot be shut down due to insulation failure of a certain load. Therefore, the 0.4kV low-voltage power system of the platform adopts a neutral point insulation system. The characteristic of a neutral point insulation system is that when a single-phase grounding occurs, the voltage and phase between each phase remain unchanged, and the balance of the three-phase system is not disrupted, so it can continue to operate in a short period of time. However, if operated with faults for a long time, it can cause phase to phase short circuits, or when single-phase arc light is grounded, the system will resonate and cause overvoltage, which will put a lot of pressure on the platform production.

　　Nowadays, most oil platforms are equipped with insulation monitoring devices. The original insulation monitoring equipment can only monitor the insulation level of the entire busbar and cannot detect which specific load has insulation faults. Therefore, insulation monitoring and fault location systems can be used to locate insulation fault circuits.

　　The data acquisition program realizes the acquisition of low-frequency voltage and current signals and stores them in real-time in the DSP's memory, where the voltage and current vector data is stored in the form of vector groups. The data collection adopts the Fourier algorithm with 24 points, and 24 data points need to be collected in one sampling period. The sampling process is as follows: starting from the monitoring terminal monitoring a round of sampling signals, synchronous sampling of voltage and current is carried out, and the cumulative completion of 24 sampling data ends one sampling period. This cycle completes the collection of insulation performance data for the power cable system.

　　The data processing program is responsible for computing and processing the data transmitted from the digital/analog acquisition module, involving Fourier decomposition operations and insulation resistance calculations. The Fourier decomposition operation directly calls the formulas in the built-in function library through C language to improve the speed of the operation. By directly calling functions, large computation and high-speed operations can be achieved, and simple C language is used for calling, ensuring the speed of code writing and the efficiency of module writing, reducing the error rate of code, and ensuring the running speed and accuracy of the program.

　　The measured insulation resistance value of the power cable detected by the monitoring terminal is transmitted to the ground substation through the CAN bus and displayed in real time through the human-computer interaction interface. At the same time, monitoring personnel can issue corresponding control commands through the human-machine interface based on the measured values and trends of insulation resistance of power cables, completing remote control of the working status of power cables.

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