Industrial Insulation Monitoring Ankrui

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.

　　During long-term operation of electrical equipment, significant physical and chemical changes may occur in the insulation, leading to a gradual deterioration of electrical, mechanical, and other related properties and damage to the insulation. The service life of electrical equipment is closely related to the insulation life. There are many reasons for insulation damage, such as mechanical force, electricity, heat, as well as factors such as microorganisms, moisture, oxidation, and radiation. These factors mostly coexist and affect each other, accelerating the process of insulation damage.

　　Because there are many types of electrical equipment and their structures vary greatly, the insulation related projects for online monitoring are also different. Research common online monitoring static equipment projects based on the differences in characteristics between sensors and devices.

　　In the hardware design process of the system for measuring leakage current, the ETCR5100 series current sensor was selected. This is a sensor specifically designed to measure leakage current, with a resolution of up to 1uA and 1%, which can meet the needs of measuring leakage current well. Because in leakage current measurement, the current is generally only a few tens of microamperes, which is a low value; The output voltage signal of the sensor is also very low. This requires two-stage amplification of the signal during the circuit design process, placing the signal in a range suitable for AD sampling, filtering it with a low-pass filter, and sending the signal to AD. The relevant principles of other current signals, bus voltage, and other conditioning circuits are similar to this principle. The DSP signal is directly input, and the AD input range needs to be considered. During the circuit conditioning process, the bias voltage is added to avoid burning out the AD due to exceeding the voltage signal range.

　　Shielding sensors. Strictly test and screen online monitoring system sensors, analyze their thermal stability and transmission ratio characteristics, and develop specialized measures for the sensors themselves. Place the sensor inside the double-layer shielded metal box. Shielding signal lines. Try to shorten the signal transmission line as much as possible, as longer signal transmission lines are more susceptible to electromagnetic interference. Choose a better quality shielded wire and adopt a double-layer shielding method to reduce environmental interference in the ground wire circuit. Thirdly, anti-interference analysis of electronic circuits. Arrange electronic components properly, separate high-speed and low-speed circuits, and keep them away from noisy components. Do not allow different power planes to overlap.

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