1>Introduction

The medical IT system is mainly used in important Class 2 medical locations such as operating room, ICU/CCU intensive care unit, providing safe, reliable and continuous power distribution for the important equipment at these locations. Medical insulation monitoring and fault locating device is developed by the many years’ design experience of the Acrel Electric in electric power meter industry, according to the special requirements of the insulation monitoring and fault locating of the power distribution system in Class 2 medical locations. The products can realize the real-time monitoring of insulation, load and temperature of isolation transformer in IT system, and have the functions of system insulation fault loop positioning and centralized monitoring by multiple pieces of systems. Products conform to the provisions of enterprise standard Q31/0114000129C013-2016 IT System Insulation Monitoring Instrument.

Medical IT system insulation monitoring and fault locating products (seven-piece set) include AITR series medical isolation transformer, AIM-M200 medical intelligent insulation monitoring instrument, AKH-0.66P26 current transformer, AIL100-4/AIL100-8 insulation fault locator, ASG100 test signal generator, DR-60-24 power module and AID200 centralized alarm and display instrument, which are shown in Table 1.

Table 1 Medical IT System Insulation Monitoring and Fault Locating Products

2> Function features

2.1 Function features of AITR series medical isolation transformer

Ø The transformation ratio between the primary and secondary windings is 1:1;

Ø Double insulation treatment is adopted between the windings, and the electrostatic shielding layer is designed.

Ø The PT100 temperature sensor is installed in each wire packet to monitor the temperature of the isolation transformer;

Ø Used for the transformation of TN system into IT system (ungrounded system) after isolation transformer.

2.3 ASG100 test signal generator

Ø The CAN bus technology is used to exchange data with other equipment.

Ø When the monitored IT system has an insulation fault, it can initiate and generate the fault location signal to the system, and realize fault locating function with the help of fault locator;

Ø Functions of L1, L2 disconnection detection, and can display the results through the luminous LED.

2.4 AIL100-4/AIL100-8 insulation fault locator

Ø The CAN bus technology is used to exchange data with other equipment.

Ø Cooperate with ASG100 test signal generator to realize fault locating function, in which the AIL100-4 can locate the insulation faults of 4 circuits and AIL100-8 can locate the insulation faults of 8 circuits. The positioned circuit is indicated by the LED indicator.

2.5 Function features of AID200 centralized alarm and display instrument

Ø Remotely monitor the real-time operation conditions of up to 16 pieces of systems, and the main interface intuitively displays whether the access system communication is intact;

Ø The insulation resistance alarm value, load current alarm value and transformer temperature alarm value of each system insulation monitoring instrument can be set up remotely, and the insulation monitor self-test can be activated remotely.

Ø When there are insulation faults, overload, excessive temperature rise of the voltage transformer or wiring faults in any of the monitored system, centralized alarm and display instrument can provide corresponding sound and light alarm function, and can manually eliminate the alarm sound.

Ø Events logging function, which is convenient for operation personnel to analyze the operation conditions of system and promptly eliminate the faults, and can save maximum of 20 newest records;

2.6 Function features of DR-60-24 power supply instrument

Ø AC 220V input, DC 24V output, with max output power of 60W;

Ø Used for the DC 24V power supply for AIM-M200 medical intelligent insulation monitoring instrument, ASG100 test signal generator, AIL100 series insulation fault locator, AID200 centralized alarm and display instrument and other instruments.

2.7 Function features of AKH-0.66P26 current transformer

*The maximum measurable current is 60A, and the transformation change ratio is 2000:1;

* Work with the AIM-M200 insulation monitoring instrument to measure the load current of isolation transformer.

3> Reference standard

GB 16895.24-2005/IEC 60364-7-710: 2002 Building electrical installations section 7-710: Requirements for special installations or locations medical locations;

IEC 61557-8-2007 Electrical safety of low voltage distribution system below AC 1000V and DC 1500V, Test, measurement or monitoring equipment for protection test section 8: Insulation monitoring device for IT systems;

IEC 61557-9-2007 Electrical safety of low voltage distribution system below AC 1000V and DC 1500V, Test, measurement or monitoring equipment for protection test section 9: insulation fault positioning equipment for IT systems;

JGJ 16-2008 Code for electrical design of civil buildings;

GB19212.1-2008/IEC61558-1: 2005 Safety of power transformers, power supplies, reactors and similar products section 1: General requirements and tests;

GB19212.16-2005/IEC61558-2-15: 1999 Safety of power transformers, power supplies and similar products section 16: Special requirements for isolation transformers for power supply in medical locations.

4 Technical parameters

Acrel Co., Ltd. [Stock Code: 300286.SZ] is one of the few leading companies in China who provides various systematic solutions of power monitoring, power control, energy management and electrical safety for smart grid users.

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