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 (five-piece set) include AITR series medical isolation transformer, AIM-M100 medical intelligent insulation monitoring instrument, AKH-0.66P26 current transformer, ACLP10-24 DC power supply, and AID series(AID100、AID120、AID130、AID150) centralized alarm and display instrument, which are shown in Table 1.

2. Functional characteristics

2.1 Function features of AITR series medical isolation transformer

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

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

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

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

2.2 Function features of AIM-M100 medical intelligent insulation monitoring instrument

* Functions of real-time monitoring and fault alarming of the ground insulation resistance, transformer load current and transformer winding temperature of the monitored IT system; 

* Can be used with insulation fault locator, remotely starting fault-locating and displaying locating results when there are insulation faults; 

* Real-time monitor the line disconnection fault, temperature sensor disconnection fault and the functional grounding line disconnection fault of the monitored system, and give the alarm indication when the fault occurs;

* Relay alarm output, LED alarm indication and other faults indication functions;  Two kinds of fieldbus communication technology, which are used for centralized alarm and display instrument, test signal generator, insulation fault locator and upper computer management software communications, and can monitor the operation status of IT system in real time. 

* Events logging function, which can record alarm occurrence time and fault type and is convenient for operation personnel to analyze the operation conditions of system and promptly eliminate the faults;

2.3 Function features of AID100/120/130/150 centralized alarm and display instrument

* 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.

2.4 Functional characteristics of ACLP10-24 instrument DC stabilized power supply

* To employ isolated linear transformer with the characteristics of strong capacity of resisting disturbance and small ripple etc.

*  AC 220V input, DC 24V output, with max output power of 3 W;

* Used for the DC 24V power supply for AID series centralized alarm and display instrument and other instruments.

2.5 Function features of AKH-0.66P26 current transformer

 The maximum measurable current is 60A, and the transformation change ratio is 2000:1;7

 Work with the AIM-M100 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.

Typical wiring diagram

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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