Xu Shuang Ankerui Electric Co., Ltd. Shanghai Jiading 201801 1 Project Introduction Due to the complex functions of large general hospitals, it is equipped with a variety of advanced medical diagnostic and therapeutic instruments to provide a solid infrastructure for the people's life and health inspection and diagnosis. Its power supply and distribution design is particularly important for ensuring the hospital's safe, reliable and stable operation. important. This project is a surgical building of a general hospital. Its functions mainly include the surgical ward, the surgical department, the surgical inpatient department, the outpatient department, the health management center, the disinfection supply room and the underground machine room, the power center, and the underground garage. The building area is about 180,000 m2, of which the area of ​​17 floors above the ground (including surgical equipment sandwiches) is approximately 130,000 m2, and the underground three-layer area is approximately 50,000 m2. The total number of beds is 837 beds, of which 36 beds are for intensive care units. The building has a height of 80m and belongs to a class of high-rise buildings. The fire-resistance grade is Grade 1, and the design seismic intensity is octave. 2 Load classification 2.1 load classification basis Before designing the hospital power distribution system, it is first necessary to divide according to the power rating of different loads. As China's medical building electrical design specification is still in the process of preparation, it is currently only a review draft, and has not yet been formally implemented. Therefore, the current load classification of medical buildings is mainly based on the current national regulations such as "Civil Building Electrical Design Specification" JGJ16-2008, "General Hospital Building Design Specification" JGJ49-1988 and "Hospital Clean Surgery Department Building Technical Specifications" GB50333-2002 And the corresponding category of buildings (such as this type of high-rise building) is divided into load levels; in addition, reference should be made to the categories and levels of safety facilities in medical facilities, such as the national standard “Building Electrical Installations Section 7-710: Special Devices Or site requirements - medical sites GB16895.24-2005. The standard divides the medical facilities into three categories according to the contact between medical electrical equipment and human body, namely category 0 medical facilities, category 1 medical facilities and category 2 medical facilities. The classification requirements are as follows: Table 1 Examples of Categories and Levels of Safety Implementation in Medical Places Category 0 medical sites: Sites where electrical devices that do not require physical contact with the thinker work. Category 1 medical site: The place where the contact parts of the medical electrical equipment need to work in contact with the electrical devices of the patient's body surface and the body (other than the environment described in the category 2 medical site). Category 2 medical sites: Medical electrical equipment Approximate contact parts need to be in contact with the patient's body (mainly the heart or near the heart) and electrical installations that endanger the life of the patient. It can be seen that the load level of the hospital should be divided into the equipment and location division of the building and should consider the level of load related to electrical equipment and places that are closely related to human life safety. 2.2 Division of load levels The project fire alarm and linkage control equipment, fire pump, fire elevator, smoke exhaust fan, fire-fighting fan, pressure blower, security system, emergency lighting, operation department, pathological section analysis, nuclear magnetic resonance, ICU, interventional month CT, Blood lighting, emergency room, treatment room and blood room electricity lighting, walkway lighting, duty lighting, security lighting, obstacle lighting electricity, cleanness hand wood room air conditioning system electricity, medical gas room equipment (oxygen machine, Vacuum pumps, compressors, etc.), weak motor rooms, life pumps, elevators, submersible pumps, etc. are all primary loads. Among them, equipments (such as ventilators, etc.) and lighting powers related to the life safety of the thinking person such as the rescue room, the hand department, and the ICU are important loads in the first-order load. Diagnosis of CT and DR electrical, electronic microscope, heating heating system, the main meeting room, main office, advanced ward electricity and other secondary loads. The rest of the load is a three-level load. 3 Power supply system 3.1 Power Supply In this project, dual 10kV power sources are introduced from two different substations (open and close stations), and the incoming line is introduced by way of cable buried ground. Two-way power supply works at the same time, each other is spare; Each road can bear all one or two loads of this project. When one power supply fails, the other power supply should not be damaged at the same time. 3.2 High-voltage distribution system The high-voltage 10kV distribution system uses a single bus segment to operate manually. The main switch and the liaison switch are set to be electrically interlocked. In any case, only two switches can be used. The low-voltage power distribution system adopts the sub-bus to run in sections, and can be automatically or manually contacted. The parent-link must be self-retrieving, self-retrieving, and manual. When the total load of the relevant two transformers does not exceed 1.1 times the single unit, the final switch can be set to self-injection. The main switch and the liaison switch are set to be electrically interlocked. In any case, only two switches can be used. 3.3 Low Voltage Distribution Transformer Settings According to the load situation, 8 sets of 2000kVA dry-type transformers were installed in the underground floor 2 power distribution room. One of the transformers 1~4# supplies power to the building's lighting, medical power, air conditioning, and other power and firefighting loads; 5# and 6# transformers supply power to the pump room in the freezer room, kitchen power, and other buildings in the existing campus, 7 The # and 8# transformers power the eight freezer units in the freezer room. The 7# or 8# transformers may be out of service during the non-air-conditioned season, which is conducive to energy saving. The main wiring diagram of the system is shown in Figure 1. Figure 1 main system wiring diagram 3.4 Emergency power settings In order to ensure the reliability of the particularly important load in the first-order load and the power supply of the fire-fighting load, two 1600-kw fast-start diesel generators have been set up as emergency power sources in this project. When both mains electricity are cut off, two diesel generators complete parallel start within 15s to ensure reliable power supply for particularly important loads and fire loads in the first-order load. When both double 10kV power supplies are de-energized or two transformers are in trouble at the same time, the delayed start signal of the diesel generator is taken from the low-voltage power-input and phase-distribution phase-input line switch to the diesel generator room, and the signal delay is 0-10s ( Adjustable) Automatic start diesel generator set. The two diesel generators are self-starting within 15 seconds, and they are put into rated speed, voltage and frequency, and they are used to supply power to the emergency bus section. When the utility power returns to power supply, the unit is automatically opened and shut down after a cooling delay. The diesel generator set is connected to the mains electricity and mechanically. Taking into account the special nature of the hospital, fire prevention and fire protection, etc., no oil storage tanks were installed in the diesel generator room, while another underground storage tank not less than 8 hours was set up in the vicinity of the outdoor diesel generator room, and temporary diesel vehicles were reserved. The oil delivery interface. For the important load less than 0.5s for power interruption, such as operating room, ICU, and important computer room equipment, power is also supplied by ups uninterruptible power supply equipment. 4 Medical Power and Air Conditioning Distribution and Control System 4.1 Low-voltage power distribution The low-voltage power distribution adopts a radial and trunk type combination method, and adopts radial power supply for a single large-capacity load or an important load such as a freezer, a pump room, an elevator machine room, etc., and a trunk type and a radial type for a general load. Combined power supply. 4.2 Power supply for large medical equipment The low-voltage power distribution cabinets are used to supply power to large-scale medical equipment (such as MR, CT, and DR). The distribution cables should meet the requirements of internal power supply resistance. Since large medical devices are often not selected at the initial design stage, the power cables that are normally supplied to them must be laid after the equipment is identified and checked for correctness to avoid waste. 4.3 Power Supply for Fire Loads and Special Loads in Class I Loads Fire load and especially important load in the first-order load such as: fire pump, exhaust fan, pressure blower, fire control room, fire elevator, rescue, inspection center, ICU, ventilator and other equipment and computer monitoring center to maintain patient's life, etc. . Dual power supply and automatic switching at the end. 4.4 Distribution of surgical layers According to the division of the fire zone and the clean zone, the surgical layer is set up with an anti-distribution switchboard. In order to facilitate maintenance and reduce contamination of the surgical department's clean area by foreign dust and germs, the general distribution cabinet of the operating department should be located in a non-decontamination area and use dual-channel power supply and set ups according to capacity. In order to ensure the reliability of power supply, special distribution boxes are set up in the operating rooms and radial power supply is used. The distribution boxes should not be located inside the operating room and should be located in the side wall of the outdoor corridor. The power distribution room is equipped with two-way radiation power supply. After the switch is performed automatically in the power distribution cabinet, the power is radiated to the special distribution boxes for each operating room. The operating room belongs to category 2 place. The medical electrical equipment and system power supply circuits in the patient area (in the horizontal range of 1.5m from the operating table and 2.5m in the vertical range) should adopt the local IT system, supplemented by local equipotential bonding. . The system is equipped with an insulation monitoring and installation device to minimize the occurrence of surgical emblem electric shock accidents. The non-essential circuit outside the patient's area of ​​the operating room adopts the TN-S system with residual current monitoring, which can realize the sound and light alarm when the residual current reaches the monitoring response value (6mA or 10mA, etc. can be set according to demand), and the switching action is achieved when the current reaches 30mA. It is helpful for early detection of problems and the normal operation of equipment in the operating room. Operating room isolation power cabinet system diagram shown in Figure 2. Figure 2 Operating Room Isolated Power Cabinet System Diagram 4.5 Lighting power supply Taking into account the large area of ​​the hospital, the general lighting and medical power load is large and there are a large number of patient specificity, a single bus is difficult to meet the power load and reliability requirements, so consider the use of two dense closed plug bus power supply. The two busbars are used for each other, and the margins are appropriately left to the design requirements or the overall demand coefficient. The total distribution box is set in the high-power shafts in each floor. The single and double floor power sources are respectively drawn from different busbar slots. When a busbar or a certain layer of lighting fails or is inspected, it can be switched to the other busbar through a manual transfer switch to ensure normal lighting power requirements. 4.6 Power Shafts (Power Distribution Rooms) According to the division of the power supply radius and the fire prevention zone, there are four high-voltage vertical parallels in this building, both serving as power distribution cubicles. Light distribution, emergency lighting, (medical) power distribution box, and ventilating and air-conditioning distribution box (some air-conditioning distribution boxes are installed in the air-conditioning room) are provided in each distribution room. Surgical layers are divided into non-clean areas based on regional allocation of power distribution. 5 Lighting Design Various wards, laboratories, doctor-patient corridors, operating rooms and other departments use diffuse reflective high-color rendering lamps to reduce glare and meet the visual requirements of the medical environment. The illuminance and power density should meet the relevant requirements of the national standard "Architectural Lighting Design Standard" GB50034-2004. The grille-type embedded fluorescent lamps (reflectors are matte alloy aluminum foils) are used in general places such as clinics and doctors' offices. In the treatment room, MR scanning room and other rooms requiring electromagnetic shielding, DC lamps are used. Cleanrooms use clean luminaires and are embedded and sealed. Fluorescent lamp adopts T8 type, color temperature is 4000K. Three color primary energy-saving lamp with color rendering index greater than 80. Due to the large number of fluorescent lamps used in hospitals, in order to increase the power to the number and reduce the sound, strobe, fluorescent lamps with high-performance, low-harmonic electronic ballasts, power factor greater than 0.95. There are foot lamps for the wards and ward corridors, and the nurses' stations can be controlled centrally. Red signal light is installed at the entrance of the operating room and large medical facilities. The hospital mainly adopts a mobile trolley type disinfection method, and outlets and wards are provided with sockets for their use. Treatment rooms, disinfection supplies and other places have fixed ultraviolet killer lamps. The luminaire adopts a type 1 luminaire with a ground terminal so that it can be reliably grounded. According to the IEC, according to people's influence on certain external environmental conditions and human capabilities, the patients in the hospital are physically or mentally deficient. The hospital is a slow place for people to evacuation. The lighting in the public areas is designed according to emergency lighting. The fire evacuation intelligent indication system is adopted to enable people to get away from the fire point in the case of fire extinguishment and to evacuate quickly and orderly. 6 Problems to be Noted in Partial Design 1) Because of the special nature of the hospital, according to the medical requirements, the use of medical sites and equipment, including all medical procedures can be completed within 3 hours, and the construction personnel can evacuation within 24 hours in advance, the standby power supply The cycle can be selected not less than 3h. Otherwise it should maintain a 24h power cycle. 2) The outlet circuit breaker that is used directly for operation or to maintain the power supply of the patient's life is only short-circuit protected and does not have overload protection. 3) The residual current operated protector for electronic information and medical electrical equipment should use electromagnetic type. 4) In order to ensure the normal operation of NMR-CT (Nuclear Magnetic Resonance), there is a strict requirement for the electromagnetic environment in the room. The internal electrical lines, appliances, etc. must not use ferromagnetic materials, which is proposed for lamps and pipelines entering the room. Special requirements. In addition, power lines entering the MRI room scan room must also be equipped with source or passive filtering devices. The lighting usually adopts DC power. If AC power is used, the lighting and pipelines should be shielded and reliably grounded. 5) The patient area of ​​the hospital operating room, ICU (intensive care intensive care unit), CCU (cardiac care unit) and other important places should use IT systems, the system's isolation transformer capacity should not be too large, so as to avoid system-to-ground capacitive current increase caused by the system Call the police. According to the stipulations of IEC 60364-7-720, its rated capacity should not be less than 0.5kVA and not more than 10kVA, and it can be determined according to actual conditions. According to the "Technical Specification for the Hospital Clean Operation Department" GB50333-2002, the total negative power distribution of the operating room should not be less than 8kVA. 7 Major Product Model Specifications and Configuration With the wide application of electronic medical equipment in the hospital field, the threat of leakage currents to patients is also growing, especially in those places where life is at stake. Patients are directly inserted into the electrodes or sensors during surgery or anesthesia. In humans, small leakage currents may cause electrocution. Therefore, the electrical design for hospitals in this special place should be strictly in accordance with national standards and norms. Ancorui's medical isolation power supply cabinet and its supporting insulation monitoring device are developed and designed for the power supply requirements of medical class II sites, and can well meet the safety and reliability of various types of operating rooms and intensive care units. Requirements, and in line with national standards. Application model The main function ICU/CCU Ward Isolation Power Cabinet GGF-I series Provides safe and reliable IT system isolated power supply for hospital ICU/CCU wards, and has an IT system insulation monitoring function. Operating room isolation power cabinet GGF-O series Provides safe and perfect power supply solutions for various types of operating rooms in hospitals, provides safe and reliable IT system isolated power supply for important surgical equipment, and has an IT system insulation monitoring function. Medical IT distribution system insulation monitoring device AIM-M100 It has the functions of real-time monitoring of insulation resistance, isolation transformer load current, transformer winding temperature and fault alarming of the monitored IT system; ACLP10-24 Instrument dedicated DC voltage regulator module, rail-mounted, AID100 Insulation resistance, variable pressure load rate real-time display function; remotely set the alarm threshold of the insulation monitor AKH-0.66P26 Protection type current transformer used with AIM-M100 insulation monitor. The maximum measurable current is 50A and the ratio is 2000:1 Isolation transformer AITR series Hospital-specific isolation transformers provide safe power isolation for various operating rooms and intensive care units system integration GGF-800 medical clean power monitoring system Centralized monitoring and management of each insulation monitoring device so that when the monitored site is in trouble, relevant personnel can respond quickly and solve problems in a timely and effective manner. With alarm display and recording function, according to the load current sub-warning and alarm, can record the alarm occurrence time, alarm type and alarm value and other information, and can support alarm sound (alarm sound can also be shielded), convenient operation and maintenance personnel analysis system operation Historical situation, timely troubleshooting The monitoring screen of an IT power supply system can be called independently and the detailed status of the transformer operation can be queried by manually selecting the IT power supply system. The system has a map and on-site distribution map display function to facilitate timely and intuitive detection of the alarm location or area of ​​the IT power supply system 8 Equipment List 8KVA floor type operating room isolated power supply cabinet (GGF-O8G) No. name model Quantity unit of measurement 1 Insulation monitor Ankerui AIM-M100 1 only 2 Isolation transformer Ankerui AITR8000 1 only 3 Alarm and display Ankerui AID100 1 only 4 Instrument power supply Ancorui ACLP10-24 1 only 5 Current Transformer Acry AKH-0.66P26 1 only Acry AKH-0.66 40I 100/5 3 only 6 Cabinet Operating room floor-standing GGF-OG 1 only 7 Isolation switch Schneider INS80 4P 1 only 8 breaker Schneider iC65N-C20/4P 1 only Schneider iC65N-C20A/4P+Vigi ELE A 30mA 1 only Schneider iDPNN-C16A/1P+N+Vigi ELE A 30mA 3 only Schneider iC65N-C10/1P 5 only Schneider iC60LMA-C40/2P 2 only Schneider iC60LMA-C25/2P 8 only 9 Meter Ankerui DTSF1352 1 only 10 PE terminal block B-3X17/10 2 only 11 Terminals For GGF 2 set 12 Signal light AD11-22/21-5GZ AC220V Green 2 only AD11-16/41-6GZ AC220V Red 17 only 13 Surge protector Schneider iPR 20 3P+N 1 only 14 heat sink KA1238HA2BMT 2 only 15 Accessories GGF-O8/10G 1 item references: [1] Brief introduction of power distribution design for surgical building of a general hospital. Intelligent building electrical technology 2013.3 [2] Ankerui Electric Co., Ltd. Product Selection Manual 2013.1. About the Author: Xu Shuang, female, undergraduate, Ankerui Electric Co., Ltd., the main research direction for medical power distribution design, mobile phone QQ
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