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 (four-piece set) include AITR series medical isolation transformer,  AIM-M10 medical intelligent insulation monitoring instrument, AKH-0.66P26 current transformer, and AID  series(AID10、AID130、AID150) centralized alarm and display instrument, which are shown in Table 1

Table 1 Medical IT System Insulation Monitoring Products

2> Function characteristics

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 Functional characteristics of AID10/130/150 alarm and displayer

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.  

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. 

Adopt the advanced field bus technology, exchange data with the insulation monitor in real time to achieve the  remote monitoring function.

2.4 Function features of AKH-0.66P26 current transformer

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.

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.

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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