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Please allow me to briefly introduce our new division N&F Energy, which deals with sale, installation and servicing of backup sources. We have been operating on the Czech and Slovak markets already since the beginning of the 1990s – even though under a different name. In 2007, N&F Marketing Group purchased the above mentioned company and inserted it into its portfolio where it is run as a part of the N&F group under the name “N&F Energy”. The main focus of our division is formed by UPS, i.e. power supply backup sources. Nevertheless, we supply also engine-type generators, DC sources, overvoltage protection systems, batteries, signalling systems, etc. We try to supply high-quality sources at a good price with regard to our competitors.
Schéma Off-line UPS
Schéma On-line UPS
Schéma Line-Interactive UPS
The simplest backup source which does not treat the power supply quality in a normal mode in any manner is characterised as follows: it will only switch over to the backup mode in the case of a power supply failure (voltage drop to below a certain level) for the period of 2-3 ms, the entire process of switchover of the power supply from the battery lasts in practice for about 14 ms. It is designed for the power supply of separate work stations or equipment with consumptions in a range of hundreds of watts. Its indisputable advantage is the high efficiency because in a normal mode the equipment is powered directly from the mains, its simple design facilitates inexpensive production.
These sources feature a medium reliability, but for the backup of more demanding applications they are missing more advanced protections and filters. If the supply of electrical energy is interrupted, there furthermore occurs an absolute power supply interruption, computer sources are able to cope with interruptions of approximately 50 ms, but this feature is highly influenced by the quality (capacitors used) and loads of the source. These units are usually called as Standby or Passive Standby in shops.
These sources feature a medium reliability, but for the backup of more demanding applications they are missing more advanced protections and filters. If the supply of electrical energy is interrupted, there furthermore occurs an absolute power supply interruption, computer sources are able to cope with interruptions of approximately 50 ms, but this feature is highly influenced by the quality (capacitors used) and loads of the source. These units are usually called as Standby or Passive Standby in shops.
A double conversion technology which eliminates all anomalies of the power distribution mains. The double conversion feature consists on the conversion of the input alternating current voltage to the direct one which permanently charges the battery and in the inversion of the direct current voltage from the battery to the alternating one which powers the load connected. The output voltage is therefore created by a DC/AC inverter and a number of filters which provide for a high-quality sinusoidal curve of the voltage on the output.
Already from the very principle it implies that this technology does not suffer of a short-term interruption of supply of electrical energy in the case of a power supply failure, it is therefore the most suitable one for the backup of more demanding applications and for the overcoming of the time of switchover to a power supply backup source. A disadvantage is the lower efficiency of the source, for the reason of a double conversion of the voltage and a shorter lifetime of the batteries used.
Already from the very principle it implies that this technology does not suffer of a short-term interruption of supply of electrical energy in the case of a power supply failure, it is therefore the most suitable one for the backup of more demanding applications and for the overcoming of the time of switchover to a power supply backup source. A disadvantage is the lower efficiency of the source, for the reason of a double conversion of the voltage and a shorter lifetime of the batteries used.
This is a hybrid technology which offers, unlike the off-line systems, a treatment of quality of the power supply, but at the same time is less expensive than the double conversion technology. It includes a more complex electronic systems for treatment of power supply, it provides for filtration for peaks and deviations from the rated value of voltage, it is able to compensate undervoltage without switching to the condition of power supply from batteries.
The Line-Interactive Technology is the most suitable for home applications, it maintains a high efficiency in the normal condition of power supply, and the time of switchover to the power supply from batteries has been reduced to values about 4 ms, it is capable of removing most anomalies of the power distribution mains and unlike the On-Line technology it is affordable for most users.
The Line-Interactive Technology is the most suitable for home applications, it maintains a high efficiency in the normal condition of power supply, and the time of switchover to the power supply from batteries has been reduced to values about 4 ms, it is capable of removing most anomalies of the power distribution mains and unlike the On-Line technology it is affordable for most users.
Czech
Tiskařská 312/5,Prague 10
108 00 Prague
Bulharská 1273/8 Brno
612 00 Brno-Královo Pole
tel.: +420 257 924 621
fax: +420 222 211 056
energy@nfmarketing.cz
prodej.energy@nfmarketing.cz
Mečíkova 26 Bratislava
84107 Bratislava
Tiskařská 312/5,Prague 10
108 00 Prague
Bulharská 1273/8 Brno
612 00 Brno-Královo Pole
tel.: +420 257 924 621
fax: +420 222 211 056
energy@nfmarketing.cz
prodej.energy@nfmarketing.cz
Mečíkova 26 Bratislava
84107 Bratislava
In the past, UPS (uninterruptible power supply) units were used only in the field of computer technology, especially in connection with the backup facilities of large data centres. Our offer is also most detailed in this area, and we have prepared several types of connection for such applications. This especially concerns a parallel run of a UPS in a redundant connection with the use of the Upsilon static switches. Thanks to the rising requirements on quality and delivery of electrical energy, the use of UPS has gradually entered into other market segments as well – mainly into the telecommunications sector, new office buildings and in the field of automation into various industries.
The use of UPS in telecommunications is necessary and leading UPS manufacturers focus their activities especially in the field of medium capacities in a range of a few kVA, which area enjoys the highest priority. For these purposes the systems mostly use UPS units in a double conversion technology with an emphasis being placed on the power supply quality, i.e. mainly a constant voltage and frequency, independently of any interference impacts in the power supply network. For this purpose, UPS are able to cope with undervoltage conditions in the power supply network without any problems, and in the case of a full blackout there is a zero time for switchover to the backup power supply source – battery. The UPS connection in a double conversion technology is completed with a bypass system for the case of a UPS overload or its failure. This connection makes it possible also to connect an independent source to the appliance power supply system.
In the case of modern office buildings, UPS units are mostly used as backup facilities for transmission servers designed for connection to the Internet or corporate extranets, and they are an indispensable part of the infrastructure of the actual building, in particular as backup units for fire alarm systems, and according to the requirements of landlords also for backup of protected distribution systems until the time of starting up of the permanent backup source – diesel electric generator set. As far as server backup systems are concerned, simpler UPS units in an interactive technology are prepared, as they make it possible to monitor parameters of the power supply system and responses to voltage changes. In the case of a complete blackout the switchover to the backup source is almost immediate – about 3 ms, which does not cause any data loss. UPS has a possibility of connection to the server monitored with the use of the serial interface, either USB or RS 232, and a part of the delivery is also the Solution pack software, which monitors the UPS state, mainly the battery charge, and it is also able, in the case of a power supply network failure, to switch off the equipment with a backup feature – server – in the case that the power supply is not restored after the lapsing of the backup time considered beforehand. We focus, especially in office buildings, on a new area – infrastructure of buildings – in connection with backup features for fire alarm systems – for signalling and activation of heat and smoke fans or for the opening of chimney lids. Larger capacities are used for these purposes – in a range of several dozens of kVA with a three-phase input and output. UPS are often used in these buildings, for the completion of lift travels in the case of a power supply failure or directly for evacuation lift power supply.
The requirements for backup sources in automation in industries are again slightly different. The up-to-date technological lines are highly sensitive to the so-called micro-failures of power supply or to switching undervoltage. It is quite a rare situation when a UPS unit is used for the power supply of the entire technological line, especially in the operations with a threat of a high financial loss in the case of solidification of a medium in the equipment, such as glass or plastic melted materials, possibly of a moulded piece. For these individual cases we have prepared UPS units with capacities in a range of even several hundreds of kVA. UPS units for technological purposes offer other use as well – even without a backup feature – as a voltage stabiliser or it is possible to use them as a frequency converter to a high capacity, e.g. for the tests of equipment which is to run with a frequency of 60 Hz. at the consumer’s premises. Our offer includes also low-capacity UPS units designed as backup systems for control computers or programmable automatic machines, for the control of complex technological lines. In the case of the use of a UPS it is possible to guarantee the operation continuity for the case of a micro-failure of the power supply network and possibly also in the case of a longer blackout, when the system ensures survival of all the data and of course of all the programs stored. By providing these automatic systems with a backup feature it is possible to very simply prevent any large operation loss caused by production outage from occurring, and this holds for both small and large UPS units, including all support systems. With regard to the fact that the issues of uninterruptible power supply sources are rather comprehensive, I recommend you to contact our business representatives in the case of specific requirements, and they will be glad to advise you in your application.
The use of UPS in telecommunications is necessary and leading UPS manufacturers focus their activities especially in the field of medium capacities in a range of a few kVA, which area enjoys the highest priority. For these purposes the systems mostly use UPS units in a double conversion technology with an emphasis being placed on the power supply quality, i.e. mainly a constant voltage and frequency, independently of any interference impacts in the power supply network. For this purpose, UPS are able to cope with undervoltage conditions in the power supply network without any problems, and in the case of a full blackout there is a zero time for switchover to the backup power supply source – battery. The UPS connection in a double conversion technology is completed with a bypass system for the case of a UPS overload or its failure. This connection makes it possible also to connect an independent source to the appliance power supply system.
In the case of modern office buildings, UPS units are mostly used as backup facilities for transmission servers designed for connection to the Internet or corporate extranets, and they are an indispensable part of the infrastructure of the actual building, in particular as backup units for fire alarm systems, and according to the requirements of landlords also for backup of protected distribution systems until the time of starting up of the permanent backup source – diesel electric generator set. As far as server backup systems are concerned, simpler UPS units in an interactive technology are prepared, as they make it possible to monitor parameters of the power supply system and responses to voltage changes. In the case of a complete blackout the switchover to the backup source is almost immediate – about 3 ms, which does not cause any data loss. UPS has a possibility of connection to the server monitored with the use of the serial interface, either USB or RS 232, and a part of the delivery is also the Solution pack software, which monitors the UPS state, mainly the battery charge, and it is also able, in the case of a power supply network failure, to switch off the equipment with a backup feature – server – in the case that the power supply is not restored after the lapsing of the backup time considered beforehand. We focus, especially in office buildings, on a new area – infrastructure of buildings – in connection with backup features for fire alarm systems – for signalling and activation of heat and smoke fans or for the opening of chimney lids. Larger capacities are used for these purposes – in a range of several dozens of kVA with a three-phase input and output. UPS are often used in these buildings, for the completion of lift travels in the case of a power supply failure or directly for evacuation lift power supply.
The requirements for backup sources in automation in industries are again slightly different. The up-to-date technological lines are highly sensitive to the so-called micro-failures of power supply or to switching undervoltage. It is quite a rare situation when a UPS unit is used for the power supply of the entire technological line, especially in the operations with a threat of a high financial loss in the case of solidification of a medium in the equipment, such as glass or plastic melted materials, possibly of a moulded piece. For these individual cases we have prepared UPS units with capacities in a range of even several hundreds of kVA. UPS units for technological purposes offer other use as well – even without a backup feature – as a voltage stabiliser or it is possible to use them as a frequency converter to a high capacity, e.g. for the tests of equipment which is to run with a frequency of 60 Hz. at the consumer’s premises. Our offer includes also low-capacity UPS units designed as backup systems for control computers or programmable automatic machines, for the control of complex technological lines. In the case of the use of a UPS it is possible to guarantee the operation continuity for the case of a micro-failure of the power supply network and possibly also in the case of a longer blackout, when the system ensures survival of all the data and of course of all the programs stored. By providing these automatic systems with a backup feature it is possible to very simply prevent any large operation loss caused by production outage from occurring, and this holds for both small and large UPS units, including all support systems. With regard to the fact that the issues of uninterruptible power supply sources are rather comprehensive, I recommend you to contact our business representatives in the case of specific requirements, and they will be glad to advise you in your application.