Sector salud
Pocas aplicaciones de nuestro entorno como las instalaciones médicas pueden considerarse tan sensibles a los cortes de electricidad. La interrupción del suministro eléctrico en un momento inoportuno puede provocar daños irreversibles en los equipos técnicos y, sobre todo, poner en peligro la salud de los pacientes.
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MEDICAL LOCATIONS OF GROUP 2 (OPERATING THEATRES, ICU)In medical locations of group 2, based on the standard HD 60364-7-710, an isolated system shall be used to supply critical circuits. In addition, the standard extends the basic duties of IT power supply system monitoring (defined by the standard HD 60364-4-41) and implements a special type of isolated system, the so-called Medical Isolated Power Supply (MIPS).
According to HD 60364-7-710 the power distribution system for medical locations should have two sources of power supply for increased power availability. In case of a failure of the general power supply source, the power supply for safety services shall be energized to feed specified equipment with electric energy within a pre-determined changeover period and for a defined period of time.
In Group 2 medical locations safety power supply sources with a changeover period > 0.5 s (short interruption time) must guarantee power for at least 3 hours for luminaires of operating theatre tables, other essential light sources and life supporting medical equipment. Such a short changeover time is usually achieved using Uninterruptible Power Supply (UPS) systems.
Safety lighting, other medical equipment in Group 2 locations, fire detection etc. shall be connected within 15 s to a safety power supply (medium interruption time).
All other equipment for the maintenance of hospital services (sterilization, cooling, catering…) shall be connected to power supply with a changeover period > 15 s (long interruption time).
All socket outlets supplied from the safety power supply source must be easily identified (usually using different colours) according to their safety classification.
The MIPS supervision must be carried out in a suitable place, where it shall be constantly monitored by medical staff. In practice, a remote control panel is placed in the operating theatres and intensive care unit (ICU) locations, so that in the event of an ongoing medical procedure, the medical staff will be informed of a possible threat to the energy supply.
The HAKEL company addresses the issue of supervision - in medical locations of group 2 - by using MDS-DELTA signalling panels. These panels meet the requirements for acoustic and optical signalling, while the acoustic signalling can be shut down and the visual cannot. In addition, they contain a button to invoke a remote test of the insulation monitoring device.
These panels are available for the 45x45 mm cable tray or for the 68 mm electrical back box. Standard degree of protection is IP20, however a version for rooms where rinsing is applied is also available with IP44 protection degree. All versions of signalling panels are made of antimicrobial material and are therefore also intended for direct installation in operating theatre rooms, requiring maximum sterility.
We recommend to periodically check the insulation resistance function not only with the "TEST" push-button, but also using a test plug, which invokes a clearly defined level of insulation resistance fault. For these purposes, HAKEL company produces an accessory – Testing Resistor 47 kOhm.
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Isolated power panel of Medical IT systemThe Medical IT system is created by a separate and for this purpose dedicated transformer. Based on the HD 60364-7-710:2012 standard the transformer shall be located as close to the group 2 medical locations as possible and the distance between the output terminals of the transformer and the appliance itself shall not exceed 25 m. It is forbidden to protect the transformers at the input and output against overcurrent, only short-circuit protection (fuse) is allowed. Recommended fuse value is given in the transformer data sheet.
HAKEL company offers safety isolating transformers for healthcare in two product series. The MED STD-line is a series of standard single-phase transformers, which is characterized by high reliability and low switch-on currents. The MED ECO-line is a series that takes over the features of the MED STD-line and extends it with a significant effect of reduced iron and copper loss. We supply transformers in a single-phase design, with an input voltage of 230 V or 400 V and outputs from 2,5 kVA to 10 kVA, with a pair of integrated temperature sensors (PT100 type). The transformers are available in IP00 protection degree or in a steel case with IP23 protection.
In order to be able to operate the transformer in healthcare, it is necessary to monitor its immediate operating temperature and current consumption on the secondary side. This function is performed by the insulation monitoring device, which always monitors at least three parameters in healthcare (MIPS insulation resistance, temperature and current of isolating transformer). It is therefore necessary to use special insulation monitoring devices, which are referred to as "IMD MED". This designation is implemented by the standard IEC 61557-8:2014.
HAKEL company offers HIG95-DELTA insulation monitoring device for medical locations. It is a modern device that meets all the requirements for the supervision of the Medical Isolated Power Supply (MIPS). It evaluates the insulation resistance in the range of 5 kΩ to 10 MΩ. For transformer thermal load sensing the PT100 sensors, PTC thermistors or NC sensors can be used. The current load is monitored by measuring current transformers of the HIG-MT series.
In addition, MDS-DELTA and MDS-D series remote monitoring/signalling panels can be connected to the insulation monitoring device. A 24 V DC power source must be used to supply the remote monitoring panels. It is possible to use power sources from the HIG-PS series, where there is an output of 5 W or 15 W available.
The standards also recommend to apply a so-called insulation fault location system to each MIPS output. It is a system that can detect specific circuit in the event of an insulation fault, typically the specific socket outlet circuits where the insulation resistance was disrupted. The HAKEL company offers HIG-IFL DELTA . This insulation fault location system allows to evaluate up to 6 circuits, and up to 10 location systems can be used. In total, one supervised MIPS can have 60 sub-circuits.
If the changeover from the primary power system to the safety power source is required, it is possible to use automatic transfer switching equipment – ATyS M, also available in HAKEL product portfolio.Nahrávám ...
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MEDICAL MONITORING STATIONSThe essential standard for health sector (HD 60364-7-710:2012) says that the supervision of the Medical Isolated Power Supply (MIPS) is carried out by medical staff so that the condition of MIPS can be monitored continuously. This means that it is not enough to know the condition of the isolated power supply system only during an ongoing medical procedure, but it is necessary to monitor it continuously. The reason is the need to know whether it is possible to start and complete the procedure at the given workplace without any restrictions. For this purpose, remote monitoring panels are usually duplicated - i.e., one MIPS uses one insulation monitoring device, but up to several remote monitoring panels in different places.
In practice, we can most often see a solution where for a certain number of medical locations of group 2 (e.g., operating theatres, for more see point A) there is at least one room, where medical staff gathers together, and where someone is always present, regardless of the performance of medical procedures. These are very often nurses' stations. And that is why it is appropriate to install a central monitoring of all MIPS systems in a such room. The result is always an early response of medical personnel to supply system insulation faults or isolating transformer faults.
In the HAKEL system, it is recommended to install MDS-DELTA remote monitoring panels in operating theatre rooms, where these panels are connected to only one MIPS. Conversely, it is recommended to install MDS-D series remote monitoring panels to the nurses’ and doctors’ station, that enable to display of up to 24 isolated systems by one product. If a project engineer chooses a similar solution, then the condition of only those MIPS, that are directly related to the given room, is signalled in the operating theatres. And conversely, condition of all MIPS that belong to a certain medical department can be easily and clearly seen in the nurses’ station.
MDS-D is a digital display unit with a colour touch LCD. This panel meets the requirements for remote monitoring according to standards, i.e., it has an acoustic and visual fault signalling, where the acoustic one can be removed, the optical one cannot. For easy understanding, the panel allows user naming of individual MIPS and displays real-time measured quantities, their values and settings. Panels require a low voltage supply of 24 V. The HIG-PS series can be used for this, offering sources of power of 5 or 15 W.
MDS-D remote monitoring panels are available in two versions, with IP20 or IP66 protection degree. They are always installed on the wall or distribution board. IP20 version also fits the 68 mm electrical back box. Communication with insulation monitoring devices and other HAKEL accessories takes place via RS485 bus. Panels are equipped with a second communication line, which allows to transmit information further to the electrical maintenance or energy department.Nahrávám ...
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LOW VOLTAGE SUBSTATIONLV substation is used to distribute electric energy to secondary switchboards across the hospital building. This is the essential technical room, where only the technical staff of the hospital maintenance may enter.
These substations are very often equipped with a central battery backup system – UPS. Backup power supply units are critical components of the medical infrastructure and they have a direct effect on which parts of the electrical installation remain energized in the event of energy supply outage of the distribution system. In order to reduce the risks associated with a UPS system fault, these devices are equipped with control outputs where they are able to signal their operating conditions.
In order to provide information of the UPS system condition quickly enough to both the technical and medical personnel, HAKEL company has developed the HIG-8IN unit. It is an I/O module to which any logic signal can be connected. For UPS systems, the battery signalling outputs are often connected here, providing indications of a discharged battery or an internal UPS fault. These conditions are then transmitted via RS485 bus to the MDS-D remote monitoring panel, where the UPS condition will be signalled along with the MIPS statuses.
It is often possible to come across the approach, when the remote monitoring panel is installed inside the LV substation. Such panel is only for hospital technical staff here and it usually displays information from all MIPS in the entire building. A similar MDS-D application then saves time of maintenance staff, that can monitor the currently measured values for the entire object from one place. If required, MDS-D also includes a bulk test function, when all insulation monitoring devices can be tested by a single touch from one panel.Nahrávám ...
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MAINTENANCE OR POWER ENGINEER ROOMModern approaches to diagnostics and monitoring require that the supervision of Medical Isolated Power Supply (MIPS) is carried out not only by medical personnel at the place of a medical procedure or at the supervisory workplace, but it is also required to make the whole system remotely accessible to maintenance staff managers or power engineers.
The aim is therefore to be able to transfer information about MIPS condition to the command workplace, ideally using the existing infrastructure. Because these workplaces are very often dislocated from the medical locations themselves (another floor, another building, or even another city), data transmission via ethernet network is used. Thanks to this, it is possible to monitor the MIPS condition theoretically from any place.
HAKEL company offers HIG-GW E01 and HIG-CTP products for such remote supervision. It is a communication gateway, which ensures the transmission of data from MDS-D remote monitoring panels to standard ethernet. The product allows monitoring of up to 24 MDS-D panels at a time, where each MDS-D panel can monitor up to 24 insulation monitoring devices (i.e., 24 separate MIPS). It is therefore possible to monitor up to 576 medical IT systems with one HIG-GW E01. In addition, HIG-GW E01 allows to get faults and alarms history from all connected MIPS.
HIG-GW E01 gateway has two integrated ways how to monitor MIPS condition. The basic module is an integrated webserver. This allows to see the monitored system from any device that supports viewing of web pages. MIPS system can therefore be controlled from a regular PC, tablet or smartphone. If an investor also requires to assign MIPS status monitoring to his own system, the integrated MODBUS TCP protocol can be used. This protocol allows MIPS condition monitoring by using BMS (building management system) or SCADA (supervisory control and data acquisition).
HIG-GW E01 is placed in a data switchboard or directly into the Isolated power panel on a 35 mm DIN rail and it is necessary to supply it with a low voltage of 24 V DC, with a minimum power of 15 W. We recommend using HIG-PS 24V/15W for power supply.Nahrávám ...
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