1.Overview
With the development of industrial technology, leakage current poses a great threat to the safety of industrial production. In order to improve the continuity and reliability of power supply, ungrounded power supply system is adopted in many important production sites. AIM-T series industrial insulation monitor is mainly used in AC ungrounded system in industrial fields such as mine, glass plant, electric furnace and test equipment, metallurgical plant, chemical plant, explosion dangerous place, computer center and emergency power supply. It is used to real-time monitor the insulation condition of the system to the ground. When the grounding fault occurs in the system, the alarm should be given in time to remind the relevant personnel to troubleshoot. The design of products is strictly in accordance with national standards and norms.
2.Introduction
2.1AIM-T series industrial insulation monitor
AIM-T300 AIM-T500
AIM-T series insulation monitors are mainly used in IT distribution system of industrial sites. The products mainly include AIM-T300 and AIM-T500 series. The two insulation monitors are suitable for pure AC, pure DC and AC-DC hybrid systems except for different voltage levels.
2.2 Standard
1.IEC 61557-8-2007 Electrical safety in low voltage distribution systems up to 1000V a.c. and 1500V d.c.—Equipment for testing, measuring or monitoring of protective measures — Part 8：Insulation monitoring devices for IT systems
2.GB/T 18268.24-2010 Electrical equipment for measurement, control and laboratory use—EMC requirements—Part 24：Particular requirements—Test configurations, operational conditions and performance criteria for insulation monitoring devices according to IEC 61557-8 and for equipment for insulation fault location according to IEC 61557-9
2.3Naming Rules
2.4 Technical Parameters
type Specifications | AIM-T300 | AIM-T500 | ||
AUX POWER | Voltage | AC85…265V | AC85…265V | |
Power consumption | ＜8W | ＜8W | ||
Monitored IT system | Voltage | Up to 450V（AC、DC、AC&DC） | Up to 800V（AC、DC、AC&DC） | |
Frequency | 40~60Hz | 40~60Hz | ||
Insulation Monitoring | measuring range | 1kΩ-5MΩ | 1kΩ-10MΩ | |
Alarm range | 10kΩ-5MΩ | 10kΩ-10MΩ | ||
Relative uncertainty | 1…10k：10k； 10k…5M: ±10% | 1…10k：10k； 10k…10M: ±10% | ||
Permissible system leakage capacitance | <150uF | <500uF | ||
Response time | <6s | <5s | ||
Communication | RS485，Modbus-RTU | RS485，Modbus-RTU | ||
Internal parameters | Measuring current | <170uA | <270uA | |
EMC/EMR | IEC61326-2-4 | IEC61326-2-4 | ||
Rated impulse voltage /pollution degree | 8kV/Ⅲ | 8kV/Ⅲ | ||
Internal DC resistance | ≥120kΩ | ≥180kΩ | ||
output | Relay output | Early warning, alarm | Error, early warning, alarm | |
Environment | Operation temperature | -20—+60℃ | -15—+55℃ | |
Storage temperature | -20—+70℃ | -20—+70℃ | ||
Relative humidity | 5%-95%，No condensation | 5%-95%，No condensation | ||
Altitude | ≤2500m | ≤2500m | ||
2.5 Overall and installation dimensions(unit：mm)
3.Application Schemes
3.1 Application schematic diagram of AIM-T series
AIM-T300 Insulation Monitor is suitable for AC, DC and AC-DC hybrid ungrounded systems up to 450V. AIM-T500 Insulation Monitor is suitable for AC, DC and AC-DC hybrid ungrounded systems up to 800V. It can real-time monitor the insulation status of IT system to the ground. At the same time, AIM-T500 supports the bus interconnection function of two IT systems, that is, when two IT systems are combined into one IT system through the bus, only one insulation monitor works, and the other automatically stops the insulation monitoring function after the bus switch closes. The application schematic diagram of the insulation monitoring device in the main distribution system is shown below.
3.2 Model selection
Application occasions | Pictures | Types | Main functions |
Mines, glass factories, electric furnaces and test equipment, metallurgical factories, chemical factories, explosion hazard sites, computer centers and emergency power supply sites using IT systems up to 450V |
| AIM-T300 | Insulation resistance monitoring of IT system to earth, 2 relays output, RS485/Modbus protocol, Fault Event Recording, Self-check function, Break-line Monitoring Function |
Mines, glass factories, electric furnaces and test equipment, metallurgical factories, chemical factories, explosion hazard sites, computer centers and emergency power supply sites using IT systems up to 800V |
| AIM-T500 | Insulation resistance monitoring of IT system to earth, 3 relays output, RS485/Modbus protocol, Fault Event Recording, Self-check function, Break-line Monitoring Function, Support multiple IT systems interconnection |
4.Typical Connection Diagram
