Download STS static transfer switch

Specification for Tender
840999613
STS static transfer switch
1
Specification for Tender
840999613
Table of contents:
1. Purpose of the STS..................................................................................................................
p. 4
2. Description...............................................................................................................................
p. 5
2.1 Operating principles................................................................................................................
p. 4
2.2 Technology .............................................................................................................................
p. 5
2.3 Operation, maintenance ..........................................................................................................
p. 5
3. Operation .................................................................................................................................
p. 5
3.1 Transfer conditions .................................................................................................................
p. 5
3.2 Transfer modes .......................................................................................................................
p. 6
3.3 Transfer time ...........................................................................................................................
p. 7
3.4 Transfer with out-of-phase sources ........................................................................................
p. 7
3.5 Transfer disablement ..............................................................................................................
p. 8
4. Protection against internal faults ..........................................................................................
p. 8
4.1 Fault-tolerant design ...............................................................................................................
p. 8
4.2 SCR monitoring ......................................................................................................................
p. 8
4.3 Overtemperature detection......................................................................................................
p. 8
4.4 Redundant supplies with alarm ...............................................................................................
p. 8
4.5 Self-monitoring and redundancy of the control electronics ...................................................
p. 9
4.6 Physical separation of the static switches ...............................................................................
p. 9
4.7 Thermal margin of the semi-conductors .................................................................................
p. 9
5. Electrical characteristics ........................................................................................................
p. 9
5.1 Input characteristics ................................................................................................................
p. 9
5.2 Output characteristics .............................................................................................................
p. 10
6. Mechanical characteristics .....................................................................................................
p. 10
6.1 Modular design .......................................................................................................................
p. 10
6.2 Wiring and cables ...................................................................................................................
p. 10
6.3 Monitoring of circuits .............................................................................................................
p. 10
6.4 Materials used .........................................................................................................................
p. 11
6.5 Short-circuit withstand capacity .............................................................................................
p. 11
6.6 Switchgear and controlgear ....................................................................................................
p. 11
6.7 Ventilation and cooling...........................................................................................................
p. 11
7. User interface and communications ......................................................................................
p. 11
7.1 User interface ..........................................................................................................................
p. 11
7.2 Communication.......................................................................................................................
p. 13
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Specification for Tender
840999613
8. Configuration ..........................................................................................................................
p. 14
9. Environment conditions .........................................................................................................
p. 14
10. Standards and tests ...............................................................................................................
p. 15
10.1 Standards...............................................................................................................................
p. 15
10.2 Certification of conformity ...................................................................................................
p. 15
11. Test procedures and quality system ....................................................................................
p. 15
11.1 Test procedures…………………………………………………………………………….
P.15
11.2 Quality system……………………………………………………………………………..
p. 15
12. Start-up ..................................................................................................................................
p. 16
13. Replacement parts ................................................................................................................
p. 16
14. Warranty ...............................................................................................................................
p. 16
15. Services ..................................................................................................................................
p. 16
16. Electrical diagram ................................................................................................................
p. 17
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Specification for Tender
840999613
1. Purpose of the STS
The static transfer switch (STS) shall be of static design and used to transfer, automatically or manually, one
or more three-phase loads from one power source (Source 1) to another (Source 2) and back, without
interruption. If the source supplying the loads fails, transfer to the other source shall be automatic.
The STS shall provide an effective solution to the following needs:
- complete separation of the two sources and of the associated distribution systems;
- source redundancy with no-break transfer of the loads, in existing installations;
- separation of loads to avoid mutual disturbances.
The STS thus improves the availability of energy, while facilitating operation and maintenance, in
installations supplying sensitive loads.
2. Description
2.1 Operating principles
2.1.1 Transfer between two sources
The static transfer switch shall comprise two inputs, called Source 1 and Source 2, supplied by two power
sources. The first shall be termed the Preferred source and the second the Alternate source.
The STS output shall be connected to a critical load. In the event of a power failure, the STS shall
automatically transfer from one source to the other in less than a quarter cycle (5 ms). Transfer may be of the
three-pole or four-pole type, depending on the applicable standards for the installation and the system
earthing arrangement.
2.1.2 Symmetrical operation
STS architecture and operation shall be totally symmetrical, i.e. it shall be possible to select Source 1 as
either the Preferred source (with Source 2 as the Alternate source) or the Alternate source (with Source 2 as
the Preferred source), with modification of this order at any time.
Selection shall be possible:
- locally via the control and monitoring panel;
- remotely using remote-control functions.
2.1.3 Reversibility of transfers
Depending on installation operating conditions, the STS shall also allow automatic return transfer from the
Alternate source to the Preferred source under the same conditions.
Independent with respect to the power sources
The STS shall be capable of operating with all types of power sources (AC distribution systems, UPSs,
engine-generator sets). However, to ensure proper operation of the power supply system as a whole (sources,
STS, loads), sources must normally be balanced as regards voltage, synchronized and in phase, either
naturally or by means of a specific synchronization device (installed at source level), as indicated in section
3.1.4).
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2.2 Technology
2.2.1 Static technology
The static transfer switch (STS) shall consist of 2 three-phase static switches, one on the Source 1 path, the
other on the Source 2 path.
Each static switch (SS) is made up of 3 pairs of reverse connected Silicon Controlled Rectifiers (SCR). The
static switches must be capable of supporting the entire load.
For four-pole breaking, in addition to the static switch, double commutation of the neutral shall be ensured
by an electromechanical contactor to make transfer more secure.
2.2.2 Break Before Make switching technology
The switching technology shall be of the "Break Before Make" type.
This technology checks, phase by phase, the extinction of the SCRs in the static switch to be opened before
triggering the SCRs of the other static switch. In this manner, the two power sources are never connected in
parallel. It shall therefore be possible to use the STS for transfers between sources of different types,
impedances, voltage levels, frequencies and phases, and nonetheless prevent propagation of faults from one
source to the other.
2.2.3 Individual SCR monitoring technology
The static transfer switch shall include an SCR monitoring system that continuously polls each SCR so as to
prevent the exchange of current between the two sources, preventing any risk of fault propagation.
2.3 Operation, maintenance
2.3.1 Mimic panel
On the front panel, a complete mimic panel shall group the control devices and visualize the various statuses
of the sources and loads (see section 7 "User interface and communications").
2.3.2 Bypass of the static switches
To allow maintenance and troubleshooting operations to be performed, the STS shall be equipped with 3
switches for isolation of the static switches as well as 2 bypass switches, provided with a mechanical
interlocking device. The switches shall be accessible from the front of the cabinet.
3. Operation
3.1 Transfer conditions
3.1.1 Monitoring the power sources and transfer conditions
The STS shall comprise an electronic system to monitor the two upstream sources, phase by phase, for
overvoltage and undervoltage, frequency and presence of faults.
This system shall permanently carry out the following checks which constitute the "transfer conditions":
- source voltages (Preferred and Alternate) are present and levels are within the authorized (adjustable)
tolerances (see section 3.1.2 "Voltage-range setting");
- phase angle between the Preferred source voltages and the Alternate source voltages is within the
authorized tolerances (see section 3.1.3 "Phase-angle setting");
- frequency of each source is within the authorized (adjustable) tolerances, (see section 3.1.4 "Frequencyrange setting");
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- no overload or downstream short-circuit.
To enhance the availability of energy, certain voltage, phase-angle and frequency values shall result in a
"downgraded" operating mode that does not inhibit transfer, but is signalled to the user.
3.1.2 Voltage-range setting
The monitoring system for the Preferred and Alternate sources shall include a check on the voltage and
enable the user to set two adjustable tolerance thresholds:
- overvoltage detection threshold: adjustable from + 5% to + 20%, in 1% steps, with respect to the rated
voltage. Below the set value, the source shall be deemed "within tolerance" and above "out of tolerance";
- undervoltage detection threshold: adjustable from - 5% to - 20%, in 1% steps, with respect to the rated
voltage. Within the set value, the source shall be deemed "within tolerance". Beyond the set value, the
source shall be deemed "downgraded" to a minimum value (e.g. - 32%), set with respect to the rated voltage.
Beyond the set minimum value, the source shall be deemed "out of tolerance".
3.1.3 Phase-angle setting
The monitoring system for the Preferred and Alternate sources shall include a check on the phase deviation
and enable the user to set an adjustable tolerance threshold from 1 to  45 degrees, in 1 degree steps. Within
the selected range, which must be included in the maximum range of - 45° and + 45°, the sources shall be
considered within phase tolerances. Otherwise, the sources shall be deemed "out of tolerance" and the
transfer shall be disabled.
3.1.4 Frequency-range setting
The monitoring system for the Preferred and Alternate sources shall include a check on the frequency and
enable the user to set an adjustable tolerance threshold from 1 to  10% with respect to the rated frequency.
If the frequency value exceeds the tolerance level, the source shall be deemed "downgraded".
3.1.5 Synchronization module (option)
To increase the availability of the sources for transfer, they may be synchronized by a synchronization
module having the following main characteristics:
- the module shall monitor the phase deviation between the sources (MGE UPS SYSTEMS UPSs);
- the module shall include a synchronization function that, when activated, reduces the phase deviation and
maintains it within the range specified in section 3.1.3);
- the synchronization function shall be activated when the module detects a phase deviation between the
sources exceeding the specified range, otherwise it shall be on standby;
- the synchronization function shall operate in two modes:
- automatic: in this mode, the module shall automatically determine which source controls the other,
depending on the operating conditions (availability and stability of the two sources);
- manual: in this mode, the user shall determine which source controls the other.
3.2 Transfer modes
3.2.1 Transfer in automatic mode
Automatic transfer
- During normal operation, the load shall be supplied by the Preferred source. If one of the voltage or
frequency parameters for the Preferred source is "out of tolerance" and if the phase angle between the
sources is within tolerances, the STS shall automatically transfer the load to the Alternate source.
- If the two sources are downgraded, the control electronics shall favor the source most suitable to supply the
load. In this case, only the voltage-amplitude parameters shall be taken into account in the effort to maintain
supply to the load and ensure its protection (overvoltages).
Automatic retransfer
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Following an automatic transfer, the Alternate source is active. As soon as the Preferred source is again
considered within tolerances, the order for retransfer to the Preferred source shall be issued after an
adjustable time delay. Retransfer shall be possible only if the "automatic retransfer enabled" mode is
selected.
Manual retransfer
If the "automatic retransfer disabled" mode is selected, transfer shall require manual action.
3.2.2 Transfer in manual mode
Simple manual transfer
The user may voluntarily choose to transfer the load to the Alternate source manually. This is essentially the
same as changing the Preferred-source assignment. Instantaneous manual transfers shall be authorized only
if the two sources are within tolerances.
Manual transfer with out-of-phase sources - Rolling Synch sequence
In manual mode, transfer shall be possible even if the sources are desynchronized and slipping with respect
to one another, using a "Rolling Synch" type sequence (transfer at the moment when the zero crossover of
the two voltage waves coincides).
Manual transfers shall be authorized only when the phase angle between the sources is within the ± 45°
setting range.
Transfer orders stored in memory
If an order for manual transfer is issued when the transfer conditions are not satisfactory, the order shall be
stored in memory. If, after a set time (0 to 30 minutes), the conditions are still not satisfactory and the order
could not be executed, the order shall be cancelled and the system shall return to the original condition.
3.2.3 Transfer in "protected" manual mode under unsatisfactory phase conditions
If the phase conditions between the two sources are not correct and if the two sources cannot be
synchronized (i.e. brought to within the ± 45° phase-angle tolerances, see section 3.1.3), transfer shall
nonetheless be possible manually by the user via the control panel (this function is password protected).
Transfer shall take place with an adjustable break (0 to 3 seconds) in the supply of power to the load.
3.2.4 Transfer in "forced" manual mode
If transfer has been disabled, it shall nonetheless be possible to force transfer manually by authorized
persons via a software tool. Transfer shall take place with an adjustable break (0 to 3 seconds) in the supply
of power to the load, irrespective of the status of the loads.
3.3 Transfer time
The transfer time is defined as the total length of time between the occurrence of the event initializing the
transfer and the moment when the three phases of the load are fully switched to the Alternate source.
Under normal operating conditions (sources synchronized before the event) and when supplying computer
type or slightly inductive loads, transfer time shall be less than 2 ms.
This value may be exceeded in the case of specific installations and faults such as a real short-circuit on the
Preferred source line upstream of the STS with a highly inductive load, but shall never exceed 5 ms (one
quarter of a period).
3.4 Transfer with out-of-phase sources
If the phase condition between Preferred source and Alternate source voltages is not respected (phase
deviation outside authorized tolerances), the transfer shall be:
- either performed with a voluntary load supply interrupt of a few periods;
- or initiated instantly without taking the phase deviation into account (choice made by operator during
configuration of the unit), if this is accepted by the type of load supplied.
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Specification for Tender
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As long as the phase deviation between the two power sources is greater than the set tolerance, manual
transfer or retransfer shall not be possible.
3.5 Transfer disablement
3.5.1 Transfer disabled on a downstream fault
If an overload or downstream short-circuit is detected, the transfer is disabled.
3.5.2 Voluntary disabling of a transfer
An input intended for connection to a volt-free remote control contact shall be used to disable transfers of
any kind. This function is particularly used for installations containing several STSs and a single Alternate
source with a power rating lower than total installed power. It shall prevent transfer of the other STS units as
soon as one of them has transferred its load to the Alternate source (thus making it unavailable to the other
loads).
4. Protection against internal faults
4.1 Fault-tolerant design
The STS shall by design be fault tolerant. In the event of failure of an internal component, the STS shall be
switched to the operating status (transfer initiated or disabled) which best ensures availability of the power
supply to the load, while an alarm signal shall be triggered to alert the operator.
4.2 SCR monitoring
A specific device shall permanently monitor correct operation of each static switch SCR (detection of SCR
short-circuit fault, open circuit fault, or gate control circuit failure).
On detection of a fault, the STS shall switch to the best operation mode to ensure the safety of the power
supply to the load, following the sequences below:
- manual transfer to and locking on the Alternate source:
> if a "Preferred" SCR open circuit is detected;
> if an "Alternate" SCR short-circuit is detected, the Preferred source shall be isolated by shunt tripping of
the isolating circuit-breaker of the Preferred static switch.
- definitive disablement of transfer and locking on the Preferred source:
> if a "Preferred" SCR short-circuit is detected, the Alternate source shall be isolated by shunt tripping of the
isolating circuit-breaker of the Alternate static switch;
> if an "Alternate" SCR open circuit is detected.
4.3 Overtemperature detection
With the same aim of ensuring availability of the power supply to the load, internal overtemperature
detection is tripled.
One internal overtemperature detection shall cause an alarm to be tripped, but shall not cause the unit to
stop. This shall occur only when a second overtemperature is detected.
4.4 Redundant supplies with alarm
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The STS control electronics shall have redundant logic electrical power supplies such that a failure on one
shall:
- not result in the interruption of power to the load;
- trip an alarm.
4.5 Self-monitoring and redundancy of the control electronics
The control electronics shall continuously monitor all parameters (sources, load, static switches) and control
the static switches. This system for control and monitoring shall be made up a number of boards combining
logic and digital techniques, thus enabling board self-tests and avoiding all settings using potentiometers.
The boards shall also include different levels of redundancy and operation in downgraded mode to ensure
maximum continuity of service.
4.6 Physical separation of the static switches
Even though the two STS static switches never operate simultaneously, the cooling system (radiator and
ventilation) is doubled to enable separation and a physical distance between the modules, thus enhancing
system availability by avoid fault propagation (thermal and electric shock).
4.7 Thermal margin of the semi-conductors
The semi-conductors shall have suitable inverse peak-voltage and junction-temperature values. To enhance
reliability, they shall have a thermal margin with respect to the junction temperature, for a maximum load
current, of at least 25°C below the maximum temperature in a 40°C operating environment.
5. Electrical characteristics
The main electrical characteristics shall be those listed below.
5.1 Input characteristics
The Source 1 and 2 inputs shall have the following characteristics:
- rated voltage: 400 V rms
- voltage range: 380 V rms -10% to 415 V rms + 10%
- rated frequency: 50 Hz / 60 Hz +/- 5%
- number of phases:
> 3 phases + neutral,
> 3 phases switched, 3 phases + neutral interrupted
- type of connection: 4 wires + earth
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5.2 Output characteristics
The following output characteristics shall apply for linear loads:
- ratings: 30 -60 - 100 - 160 - 250 - 400 - 600 - 800 - 1200 - 1600 A rms
- overload capacity:
> 105% continuous
> 110% for 15 minutes
> 115% for 10 minutes
> 150% for 2 minutes
> 200% for 20 seconds
> 600% for 1 second
> 2 000% for 20 ms
- efficiency:  99% at rated current
- transfer time:  3 ms typical.
6. Mechanical characteristics
6.1 Modular design
The STS shall be modular in design. It shall be mounted in metal cabinets, placed or anchored to the floor,
meeting the requirements of protection index IP20, in compliance with standard IEC 60529.
The mechanical structure of each cabinet shall be sufficiently strong and rigid to withstand handling and
installation operations without risk.
The cabinets shall be divided into sections where all electromechanical devices (circuit breakers and
switches) shall be separated from all electronic assemblies and PC-boards, to make maintenance on the
electronic devices possible after isolating the various parts.
Subassemblies shall be designed to facilitate access and replacement of parts. The system shall be mounted
such that each electrical component may be replaced without having to solder or use special tools.
6.2 Wiring and cables
Entry of upstream and downstream power cables, as well as any auxiliary cables, shall be possible at the
bottom, or through the bottom for a false floor.
Installation shall be facilitated by clear marking of connection terminals. Connections shall be made through
the front of the cabinet.
All connections shall be directly accessible, without having to undo other connections.
Internal conductors shall be grouped to form cables or bundles of conductors, then securely joined together.
All wires and cables shall be clearly identified using suitable labels, a color code or stamped.
The low-voltage control and monitoring wires shall be maintained at distance from all power sources to
avoid any risks of disturbances. The system shall be equipped with an earth-circuit connector, in compliance
with the standards listed in the "standards and tests" section.
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6.3 Monitoring of circuits
LEDs shall indicate critical operation on a panel to facilitate maintenance and servicing in the event of a
breakdown.
6.4 Materials used
All materials and parts used in the STS shall be new, recently manufactured and of superior quality, without
faults and imperfections, and shall not have already been used, unless as requested for testing purposes in the
factory. Manufacturing techniques shall be superior in quality.
6.5 Short-circuit withstand capacity
The components used and their assembly shall guarantee the announced short-circuit withstand capacity of
the STS (including all electromechanical and electronic devices, interconnections, cables and busbars).
6.6 Switchgear and controlgear
The circuit breakers ensuring maintenance safety and the bypass input/output switches shall be connected
such that they may be easily removed for replacement, calibration or tests, without interrupting the supply of
power to the critical load.
Mechanical interlocks between the two maintenance bypass circuit breakers (switches) shall prohibit
simultaneous closing by users.
Logical protection circuits shall ensure that if the user closes the maintenance bypass circuit breaker on the
opposite side (i.e. instead of the circuit breaker on the active path), the STS automatically switches to the
closed side.
The purpose shall be to avoid an inadvertent connection of both sources by the user.
6.7 Ventilation and cooling
A suitable ventilation system shall ensure operation of components at the rated temperature. The system
shall be sufficient to enable the STS to operate at full load, taking into account overload capacities as well.
A sufficient number of fans shall be installed to ensure cooling during operation on one or the other source
alone. The number of fans shall be sufficient to provide redundancy. The STS shall be capable of continuing
to operate with up to two fans out of order. All fan faults shall be indicated by a visible alarm.
The ventilation system shall be designed such that the STS can continuously operate at an ambient
temperature of 40° C and at a relative humidity of 95%.
The fans shall be easily accessible and replaceable without disturbing system operation. Fans shall have a
service life of at least ten years.
7. User interface and communications
7.1 User interface
7.1.1 Control panel and graphic display
The STS control panel shall be located on the front of the unit. It shall comprise:
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Specification for Tender
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- the standard controls and status indicators in a single-line mimic panel presenting all STS electrical
functions;
- a multilingual, graphic display with a menu and customer password to control access, capable of displaying
all indications on STS status:
> transfer;
> alarms;
> status information;
> measurements;
> settings;
> maintenance.
To facilitate understanding, it shall be possible to personalize the names of the sources.
The manufacturer shall provide at least the controls and alarms (visual and audio) mentioned in the sections
below.
7.1.2 Alarms and status indicators
The alarms and indicators shall provide clear information on the following situations:
- availability and status (within tolerances or downgraded) of Source 1;
- availability and status (within tolerances or downgraded) of Source 2;
- phase deviation between Sources 1 and 2 within tolerances;
- Source 1 selected as Preferred source;
- Source 2 selected as Preferred source;
- Source 1 active (SS 1 ON);
- Source 2 active (SS 2 ON);
- load supplied with power;
- alarm (general);
- automatic retransfer enabled (selected);
- automatic retransfer disabled (not selected);
- transfer to Source 1 disabled;
- transfer to Source 2 disabled.
7.1.3 Controls
Controls shall be implemented by pushbuttons for the following actions:
- selection of Source 1 as Preferred source (= manual transfer to Source 1);
- selection of Source 2 as Preferred source (= manual transfer to Source 2);
- selection of the retransfer mode;
- alarm reset;
- lamp test.
7.1.4 Measurements
The graphic display shall make available the values listed below:
- current on the three phases and on the neutral;
- phase-to-neutral and phase-to-phase voltages on the three phases;
- frequency and phase deviation;
- power factor;
- crest factor;
- percent load;
- apparent power S;
- active power P;
- other measurements.
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7.2 Communication
The STS shall be equipped with remote-control functions using:
- a remote-indications I/O terminal block with isolated volt-free contacts;
- an RS485 ModBus serial-link port.
7.2.1 Remote-indications I/O terminal block
- Outputs
The following output information shall be available on O/C isolated volt-free contacts (24 V DC, 1 A relay)
for remoting:
> fault (downgraded or outside tolerances) on Sources 1 and 2;
> phase deviation between Sources 1 and 2 outside tolerances;
> Source (1 or 2) selected as Preferred source;
> Source 1 active (SS 1 ON);
> Source 2 active (SS 2 ON);
> load supplied with power;
> alarm (general);
> automatic retransfer enabled (ON).
- Inputs
The STS shall be capable of receiving the following commands:
> selection of Source 1 as Preferred source (= manual transfer to Source 1);
> selection of Source 2 as Preferred source (= manual transfer to Source 2);
> selection of retransfer mode;
> alarm reset;
> transfer disablement.
7.2.2 Serial link
The STS shall have an 9 600 baud RS485 communications port. The protocol shall be a subset of the
MODBUS protocol. Communication shall be of the master/slave type, where STS is the slave.
The intended user configuration shall be a multi-point network capable of addressing up to 255 devices. The
impedance at each end of the line shall be 120 Ohms. The port shall consist of an RJ9 telephone jack
installed on the main control and monitoring board.
- Status information
The information available via the serial link shall be the same as that available on the I/O terminal block.
- Controls
The commands transmitted via the serial link shall be the following:
> selection of Source 1 as Preferred source (= manual transfer to Source 1);
> selection of Source 2 as Preferred source (= manual transfer to Source 2);
> selection of retransfer mode;
> alarm reset.
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8. Configuration
STS configuration shall be possible via a PC microcomputer connected to the parameter-setting port and
using the system-customizing software. It shall be possible to set the parameters listed below.
Configurable parameters and setting ranges
parameter
range
- Rated source voltage
- Rated source frequency
- Retransfer mode (return to
the Preferred source after
transfer)
- Overvoltage detection
threshold
- Undervoltage detection
threshold
- Phase tolerances
380 or 400 or 415
50 or 60 Hz
Manual or
automatic
- Overvoltage and
undervoltage detection
hysteresis
- Retransfer time delay
- Interrupt transfer time
+5% to +20% of Un
in 1% steps
-5% to -20% of Un
in 1% steps
±1° to ±45° in 1°
steps
0 - 6% of the set
value
1 - 255 seconds
0 - 3 seconds
default
setting
comments
Automatic
10%
-10%
±15
"source outside tolerances"
detection
phase deviation between
sources
3%
15 s
length of "source OK" check
300 ms for out-of-phase automatic
break transfers
9. Environment conditions
The environment conditions shall be the following:
- ambient temperature: 0°C to 40°C
- storage temperature: -40°C to +70°C
- ventilation: forced air (entry through bottom, exit through top)
- relative humidity: 0 to 95%, without condensation
- altitude: 0 to 1 000 meters (derating above 1 000 meters)
- noise level (as per ISO 3746) < 55 dBA or < 59 dBA depending on the rating
- degree of protection: IP 20.
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10. Standards and tests
10.1 Standards
The STS shall comply with all applicable international standards and in particular with the following
standards:
- construction and safety: EN 50091-1;
- design: IEC 60146.
The STS shall also meet all applicable electromagnetic compatibility (EMC) standards to avoid any
disturbances with respect to nearby electronic devices. Compatibility shall be ensured for both conducted
and radiated susceptibility. Consequently, the STS shall comply with the following standards in particular:
- European directive 89/336/CEE;
- EN 55011;
- EN 61000-4-3 / IEC 1000-4-3.
The STS shall also comply with the following standards:
- ISO 3746: measurement of acoustic noise;
- CE marking.
What is more, the equipment must comply with environmental-protection standards, with production taking
place on premises certified ISO 14001.
10.2 Certification of conformity
The manufacturer shall provide, on request, a complete qualification file demonstrating compliance with the
above standards.
What is more, the indicated levels of performance shall be confirmed by certification from independent
laboratories (e.g. TÜV or Veritas).
11. Test procedures and quality system
11.1 Test procedures
The UPS manufacturer shall provide proof of a stringent Quality Assurance programme.
In particular, the main equipment manufacturing stages shall be sanctioned by appropriate tests such as:
- incoming components inspection, discrete subassembly testing;
- complete functional checks on the final product.
Equipment shall undergo on-load burn-in before leaving the factory.
Final inspection and adjustments shall be documented in a report drawn up by the supplier’s Quality
Inspection department.
ISO 9001 or 9002 certification of the production site is compulsory.
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11.2 Quality system
The UPS design procedure shall be covered by an ISO 9001 quality system as well as a dependability study
to ensure maximum reliability.
12. Start-up
UPS start-up on site shall be carried out by the manufacturer or an approved representative.
It shall include on-site acceptance during which a check on system characteristics shall be made.
13. Replacement parts
The suppler undertakes to provide replacement parts for at least ten years following the date of delivery.
A set of emergency spare parts shall be supplied with the STS.
14. Warranty
The equipment shall be guaranteed (parts and labour on site) for one year following the start-up date.
15. Services
Required services include:
- supply of the STS and any accessory parts or elements;
- carriage-paid UPS transportation and delivery to the site.
Options:
- handling and installation on the site;
- connection of the sources to the STS;
- connection of the load cables to the STS.
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16. Electrical diagrams
Fig. Configuration example for a static transfer switch (STS) system.
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Source 2
Source 1
Upsilon STS
control
electronics
Q1
Q1BP
Q2
Q3
Q2BP
loads
Fig. STS simplified diagram.
18