MV soft starters RELKO

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					Technical Specification for M.V. Soft Starter
(e.g. 6KV, 400A – update as required)

 This specification defines the minimum technical requirements for the design, manufacture,
  performance and testing of a Medium Voltage Electronic Soft Starter.
 The purchaser may require from the supplier to show the capability of the quoted equipment
  in meeting the specification and provide a reference list.
 Please contact ………………………… case any of the above requirements is unclear.
 The supplier must clearly state in his quotation any deviation from the specification

 Mains voltage: 6000V +10% - 15%
 Nominal Current: 400A continuous
 Control voltage: 230VAC
 Frequency: 50Hz ± 2 Hz
 Ambient temperature: 0-500C. Relative humidity: 95% non-condensive
 Maximum number of starts: 2 per hour
 Altitude: see level
 Environment: Regular

 Centrifugal Pump 3.5 MW, 6000 KV, 400 Amp,

Scope of supply
 Digital, microprocessor based soft starter in IP32 cabinet, with Line & Bypass contactors and
   Motor Protection Relay.
 Soft starter construction shall be of a modular design. Each phase can be separately and easily
   interchanged in the field, without special tools.
 The soft starter shall start the motor by slowly ramping-up the voltage supplied to the motor
   while limiting the current to the required level.
 The manufacturer shall offer commissioning assistance and training at site.
 The manufacturer shall offer spare parts required for commissioning and 5 years operation.
 To ensure long term reliability and safety, each starter shall be tested for Partial Discharge
   (Corona Free), according to EN50178 & HD 625.1 S1:1996 Electronic Equipment for use in
   power installations.

Setting & Supervision
  Starter settings shall be made on a keypad and illuminated LCD. Illuminated LCD shall
     have 2 lines, 16 characters each.
  Display language shall be programmable: English, German, French and Spanish.
  The LCD shall display motor current, fault description and statistical data including: Total
     run time, Number of starts, Last start Current, Last start time duration, Description of last
     trip and Total number of trips.
  The LCD shall be programmable to view a full display of all parameters - for demanding
     applications or display of minimum parameters - for basic applications.
  The starter shall incorporate the following LEDs for quick status display: Control voltage
     On, Motor Starting, Motor Running, Motor Soft Stopping, Motor Stopped, Fault).
  Keys on the keypad shall be clearly marked and setting software shall have easy-to-use
     Default Parameters.
  Software lock, preventing parameters change shall be by an internal dip switch

Starting & Stopping
The starter shall have the following starting and stopping settings:
 Initial voltage: adjust. 10-80% Un
 Current Limit: adjust. 100-500% In
 Ramp-up Time: adjust. 1-90 sec.
 Ramp-down Time: adjust. 1-90 sec.
 Pulse Start: pulse of 80% Un, without current limit, for 0.1-1 sec.
 Torque Control: for linear acceleration and deceleration with selectable Torque Curves.
 Current Ramp Control: Initial Current adjust. 100-400%, Ramp-up time 1-90 sec.
 Pump Control: with selectable starting and stopping curves, to prevent Over Pressure and
   Water Hammer. Separate settings shall be available for starting and stopping.
 Dual Adjustment with two Start Stop and two FLA settings for varying loads for two speed

Motor & Starter Protection
 The starter shall have the following protection:
  Excessive starts with adjustable Max. Number of Starts, Time Period and Waiting Time
    (time delay after exceeding maximum number of starts).
  Long Start Time (Stall protection).
  Electronic Shear-pin (Jam protection) to trip instantaneously (in less than 1 cycle) when
    current reaches 850% FLA. An adjustable time delay shall be available for lower currents.
  Electronic Overload with selectable curves.
  Under Current with time delay
  Ground fault current with adjustable time delay
  Current imbalance, trip time will be related to motor load
  Phase Loss
  Phase Reversal
  Starter Over-temperature
  Shorted SCR &
  Wrong Motor Connection
  External Fault – input from a N.O. contact
  Bypass Contactor Open trips the starter if bypass contactor does not close after End of
  No Start Signal trips the Line Contactor in case power is connected to soft starter and start
    signal was not given.
 Current shall be measured by soft starter’s C/T on all three phases and above protection shall operate
 before and after bypass contactor closes.

 Upon fault, the starter shall trip and lock in a Fault Mode, also if mains voltage disappears
   (fuse blow or voltage outage).
 For maximum safety, resetting shall be possible only after start signal is removed.
 Resetting shall be possible either by local Reset Key or remotely by hard wire or
 Auto-Reset shall be possible for Under-Voltage, Phase Loss and Under Current Faults.

Communication (one of the following protocols, will be specified later)
 MODBUS RTU RS 485 half duplex, enabling Parameter settings, Control (Start/Stop, etc.)
  and Supervision.
 PROFIBUS DP enabling Control (Start/Stop, etc.) and Supervision
 TCP / IP Protocol

Auxiliary Contacts
The soft starter shall incorporate a minimum of three auxiliary relays, each with 1 C/O type, rated 8A,
250V, 1800VA, with the following functions:
 Immediate Relay shall operate upon start signal, with adjustable On and Off delays. The
   contact shall return to original position upon Voltage Outage, Fault, Stop signal and upon
   Soft stop signal – at the end of soft stopping process.
 End of Acceleration Relay shall operate upon completion of starting process, with adjust. On
   delay. The contact shall return to original position upon Voltage outage, Fault and upon Stop
   and Soft Stop signals.
 Fault Relay – shall be programmed as:
   a. Fault – changes position upon Fault, returns to original position upon Reset, after fault
      had been removed.
   b. Fault-Fail-Safe - changes position upon control voltage connection, returns upon fault.
      (Can be used for “Control Voltage Disconnected” alarm).

Special Test Mode
Full functional test of all starter circuits shall be possible by using a standard low voltage motor of about

Analogue output (when shown in the drawings)
Analog Output, relative to motors current, field selectable 0–10VDC, 0/4–20mA

Line and By-pass contactors
  Line and Bypass contactors shall be vacuum type, rated 7200V, 400A minimum.
  E1 Interrupting rating 40 MVA (equivalent to 4.62KA)
  E2 Fuse coordination 400 MVA 45.7KA RMS, 38R max. fuse size
  Withstand KA 57.8 KA-peak, 38R-fuse
  Short Time Current - 1sec-7KA, 5sec-5KA, 15sec-2.6KA
  Electrical life at rated current shall be not less than 0.4 x 10 6
  Mechanical life shall be not less than 0.75 x 10 6
  Dielectric strength 20KV, 1min.
  Impulse withstand BIL 1.2 x 50 μSec, 60 KV
  Max. Chopping current 0.9A
  AC control voltage 240V, 50/60Hz, +10% -15%
  Pick-up / Drop-out voltage 102V / 65V
  The contactor shall include 2 N.O + 2 N.C auxiliary contacts, continuous current 10A/AC,
    5A/DC 600VAC, Make / Brake ratings 7200 / 720VA.

Motor Protection Relays
Each starter shall incorporate a digital microprocessor based Motor Protection Relay (MPR) as a back up
protection. Upon fault that is not cleared by the soft starter, the MPR shall trip open the Line Contactor.
In case of a high current fault, above the maximum opening current of the vacuum contactor, the MPR shall
not trip open the Line Vacuum Contactor but shall let the fuses clear the fault, thereafter opening the
The MPR shall have the following protection and settings:
 Maximum Start Time (Stall Protection)
 Under-Current Alarm with adjustable time delay
 Under Current Trip with adjustable time delay
 Load Increase Alarm
 Low set Over-current (overload) with adjustable time delay
 High set over-current (short circuit) with adjustable time delay
 Thermal Alarm (Modeling motor heating, with adjustable time to trip at 6xIn, Hot/Cold ratio, Cool
   Time Factor, Stall Time factor).
 Thermal Trip with adjustable time delay
   Unbalance Current Alarm with adjustable time delay, calculated according to motor’s load
   Unbalance Trip with adjustable time delay.
   Ground Fault Alarm with adjustable time delay
   Ground Fault Trip with adjustable time delay
   Under Voltage with adjustable time delay
   Over Voltage Alarm with adjustable time delay
   Over Voltage Trip with adjustable time delay
   Under Power Trip with adjustable time delay
   Phase Loss
   Phase Sequence
   Motor Over Temp. – Input from Thermistor PTC / NTC or RTD (Pt100), as shown in drawing
   External Fault 1 (entry from a N.O. Contact)
   External Fault 2 (entry from a N.O. Contact)
   Internal fault
   Serial Communication fault
Function shall be programmable, for each fault, as Disable, Alarm Only, Trip Only, Alarm & Trip.
Trip contact shall be 5A,250VAC/DC.
Reset function shall be programmable for each fault as Auto Reset, Local Reset, Remote Reset.
Settings and supervision shall be by a LCD, 2 line, 16 characters each.

L.V. Control
Each starter shall have a separate, completely isolated, front accessible, L.V. compartment. The L.V.
Compartment shall include at least the following components:
 Soft starter Control Module, with fiber option wires.
 Selector Switch Local / Remote (for door mounted Start/Stop buttons or Remote by hard
 Selector switch Soft Starter / DOL starting (enabling DOL starting in case of a fault in the
   soft starter)
 Three interposing relays for starters’ output relays
 Holding relay when external Start / Stop push buttons are used.
All control components mounted in the L.V. compartment shall be wired to terminal blocks, which shall
be wired to Customer Terminal blocks.

Control Components on the door
The following components shall be mounted on L.V. door:
 Motor Protection Relay
 Start / Stop Pushbuttons
 Emergency stop push button
 Indication light: Line Contactor Closed, Line Contactor Open, Bypass Contactor Closed,
  Remote Operation, Fault

 The cabinet shall be designed and constructed according to IEC 60694 with IP 32 Protection)
  with soft starter keypad mounted behind a transparent window.
 All exterior and interior metal parts shall be coated and painted under the following procedure:
 Procedure - all parts shall be painted before assembly.
 Preparation - Alkaline wash / rinse / iron phosphates / rinse/non chrome sealer rinse / re-
  circulated de-ionized water rinse and distilled de-ionised water rinse.
 Painting – Air atomised electrostatic spray, Hybrid Epoxy Polyester powder paint –semi
  matt. Paint thickness 0.07 mm. Thicker painting as an option.
 Color shall be RAL 7032 (unless specified differently)
 Baking at 180º C (355º F) minimum.
 Optional field “touch-up” spray can(s), matching the enclosure color, shall be supplied.
Ground Bus
A continuous bare copper ground bus, 5 X 50 mm, shall be provided along the entire width of the
enclosure, at the bottom.

Power Cable Entry
Cable access shall be from bottom with a minimum of 50 cm empty space for cable connections.

Control Wires
 Control wires shall be insulated (flame retarding thermoplastic compound), flexible stranded
  copper wire supported and neatly bundled.
 Control wires shall be isolated from high voltage components (whenever possible) in the
  power cell. Each wire shall be marked with wire tube markers, numbered according to the
  electrical diagram.
 Control wire terminations shall be screw-type, copper compression type, Non-insulated,
  locking type, fork tongue lugs shall be provided on the current transformers. Whenever 2
  wires are connected to the same terminal, they shall be crimped together.
 Customer connection terminal blocks shall be located in the medium voltage section. Remote
  control cables shall be from the top or bottom of the structure.
 Control cable inputs and outputs shall be through removable entry plates on top or bottom of
  the structure.

Door Interlock
A door switch with 2 N.O. contacts shall be mounted on the M.V. door, opened when door is opened and
wired to the Line Contactor for interlocking. All M.V. doors shall be interlocked so the no door can be
opened when H.V. persists.

Cabinet Light
PL-13 watt protected lamp shall lit when opening the H.V. door, supplied from a dedicated miniature C/B.

Cabinet Heater (When shown on the drawing)
A 60W heater with humidity control, supplied from a dedicated miniature C/B.

Exhaust fan (When shown on the drawing)
An exhaust fan, in suitable dimensions, shall be installed on top of M.V. cabinet with air inlet at bottom
with filter, supplied from a dedicated miniature C/B.


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