Application of Acqua medical isolation power supply system in the operating room of a hospital

Ren Yunye Ankerui Electric Co.
, Ltd.
Shanghai Jiading 202101 [Abstract] introduced the operation room of the tertiary B general hospital using the Ankerui medical isolation power supply system, using the split distribution cabinet installation method, so as to realize the TN system into an IT system, as well as system insulation monitoring
.

【Keywords】Tertiary B General Hospital; Operating theatre; IT systems; Insulation condition monitoring
.

0 Foreword The hospital covers an area of 42,000 square meters, with a construction area of 71,400 square meters and 868 open beds
.

It is a tertiary B-class general hospital
.

This project is an emergency inpatient complex project, in which the medical isolation power supply is used in the operating room and the ICU area
on the same floor.

According to the provisions of GB16895.
24-2005, in medical Class II places, medical isolation power supply systems are used for life-sustaining, surgical and other medical electrical equipment and power supply circuits
located in the "patient area".

Therefore, the important load of the intensive care unit and the rescue room in this project should be powered by an isolated power supply
.

At the same time, the insulation monitoring device is used to monitor the insulation of the system in real time
.

1 Application Introduction The application site of this project is the second type of place area, where the important load of the operating room is the electrical appliances in the patient area including medical cranes, wall sockets, floor sockets, etc.
, and the important load of the ICU is the nursing crane, which requires the power supply and distribution system to be safe and stable, and must use the ungrounded system (IT system) to supply power
.

The power of a single medical crane tower is about 1.
5kVA, and the project chose to use an isolation transformer with 8VA capacity to power
5 medical cranes at the same time.

Because the isolation transformer will produce a large inrush current at startup, which may cause the primary side circuit breaker of the isolation transformer to be disconnected or closed difficult, so when selecting the circuit breaker of the isolation transformer inlet and outlet line, the circuit breaker with only the short circuit protection function and no overload protection function is selected according to the national standard, and the circuit breaker trip curve should be D type
.

The project used a four-piece set of medical isolation power supply products, sharing 17 sets of isolated power supply systems, including 10kVA medical single-phase isolation transformer AITR10000, 6.
3kVA medical single-phase isolation transformer AITR6300, insulation monitor AIM-M10, protective current transformer AkH-0.
66P26, power module ACLP10-24, alarm display AID150
。
There are 13 sets of isolated power supply systems in the surgical department and 4 sets of isolated power supply systems
in the ICU area.

2 System Scheme 2.
1 Operating Area Isolation Power Cabinet System Figure 2.
2 ICU Area Isolation Power Cabinet System Figure 2.
3 System Composition 1) Medical isolation transformer Isolation transformer refers to the input winding and output winding with galvanic isolation of the transformer, the isolation transformer is used to avoid accidentally touching the live body at the same time, and the isolation of the transformer is to isolate the current of the secondary side winding coil on the primary side to ensure the continuity of operation in the case of
ground failure.

The ratio of the isolation transformer is usually 1:1
.

2) The task of the insulation monitoring device of the insulation monitor is to monitor the insulation resistance between the phase line and the earth, and issue an alarm prompt
when the resistance value is lower than the set value.

The insulation monitoring device is installed between the secondary side outlet of the isolation transformer and the ground, and the measurement current is applied to the system, and when the insulation resistance of the system decreases, an alarm signal
is issued.

3) The main function of the current transformer transformer is to convert the high voltage or large current into a standard low voltage (100V) or a standard small current (5A or 1A, both refer to the rated value) in proportion to the proportion of the high voltage or large current, in order to realize the standardization and miniaturization of
the measuring instrument, protection equipment and automatic control equipment.

At the same time, the transformer can also be used to separate high-voltage systems to ensure the safety of
people and equipment.

4) The DC voltage regulator module dedicated to the power module instrument is a switching power supply
.

It has the characteristics of stable output voltage, high withstand voltage level, high power, etc.
, and has the function
of power supply power-up indication.

The module adopts the standard rail installation method, which can be installed on the same guide rail as the insulation monitor, which is easy to
install.

5) External alarm display external alarm display is used to issue an alarm caused by the fault in the distribution cabinet, remind the staff to view and eliminate the problem 3 site installation 4 project summary of today's society, the hospital will use a large number of electrical equipment to diagnose and treat patients, especially in the ICU area and the surgical department, in such places even a brief power failure or leakage will affect the health of
patients.

The Accuray isolated power supply system used in this project converts the grounding system into an ungrounded system, supplying critical loads to the operating department and ICU of the new building, ensuring continuity and safety
of power supply.

Reference[1].
Acquaray IT System Insulation Monitoring Fault Positioning Device and Monitoring System (in English and Chinese) 2020.
1[2].
Building electrical installation Part 7-710: Requirements for special devices or places - medical places GB 16895.
24-2005[3].
Civil building electrical design code JGJ 16-2016[4].
Building technical code for clean surgery department of hospitals GB 50333-2013[5].
General Hospital Building Design Code GB 51039-2014 Author Profile: Ren Yunye, male, Acquaray Electric Co.
, Ltd.
, the main research direction is IT insulation systems
.