NO.

TCE CONSULTING ENGINEERS LIMITED SECTION: D

TCE-M4-203-02 TITLE
SHEET 1
INDUCTION MOTORS
ADDITIONAL REQUIREMENT FOR HV MOTORS

1.0 SCOPE

1.1 This specification covers requirements of HV induction motors. These are in addition to
the requirements of specification No.TCE.M4-203-01. Clauses of this specification
which are not applicable for any motor are mentioned in Data Sheet-A1 of TCE.M4-203-
01.

1.2 In case of conflict between TCE.M4-203-01 or applicable standard and this

specification, this specification shall govern.

2.0 PERFORMANCE AND CHARACTERISTICS

2.1 Motors shall be capable of starting and accelerating the load with the applicable method
of starting, without exceeding acceptable winding temperatures, when the supply
voltage is 80% of the rated voltage.

2.2 Motors shall be capable of satisfactory operation at full load at a supply voltage of
80% of the rated voltage for 5 minutes, commencing from hot condition.

2.3 Motors shall withstand the voltage and torque stresses developed due to the vector
difference between the motor residual voltage and the incoming supply voltage equal to
150% of the rated voltage, during fast change over of buses. The duration of this condition
is envisaged for a period of one second.

2.4 The locked rotor current of the motors shall not exceed the following values which are
inclusive of 20% tolerance.

2.4.1 600% of full load current for motors upto and including 1500 kW.

2.4.2 450% of full load current for motors above 1500 kW.

2.5 The locked rotor withstand time under hot conditions at 110% rated voltage shall be more
than the starting time at minimum permissible voltage (clause 2.1 above) by atleast
three seconds or 15% of the accelerating time whichever is greater. Provision of speed
switch shall be avoided to the extent possible. In case the speed switch is required, it
shall be indicated out by the bidder in his offer.

When a speed switch is mounted on the motor shaft , the same shall remain closed for
speeds lower than 20% and open for speeds above 20% of the rated speed. The speed
switch shall be capable of withstanding 120% over speed in either direction of
rotation. If the speed switch requires any auxiliary voltage, it shall be suitable for
the auxiliary voltage specified in Section-B - Project Information of the specification

3.0 INSULATION TREATMENT

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 NO. TCE CONSULTING ENGINEERS LIMITED SECTION: D
TCE-M4-203-02 TITLE
SHEET 2
INDUCTION MOTORS
ADDITIONAL REQUIREMENT FOR HV MOTORS

3.1 Motors shall be given power house treatment. Additional treatments to withstand heavily
salt polluted or similar atmospheric conditions shall be given based on the location
indicated in Data Sheet-A

4.0 ACCESSORIES

4.1 EMBEDDED TEMPERATURE DETECTORS (ETD'S)

Atleast six resistance type temperature detectors for the stator winding each having D.C.
resistance of 100 ohms at 0 oC, embedded in the stator winding at locations where highest
temperatures may be expected, shall be provided. The material of the ETD's shall be
platinum. One ETD shall be provided for each of the motor bearing & shall be wired upto
the terminal box. The temperature detectors shall be of 3 wire , duplex type.

4.2 BEARING THERMOMETERS

4.2.1 Each bearing shall be provided with a dial type thermometer. Each thermometer
shall consist of 2 potential free contacts. They shall be designed to close
independently at two different temperatures - one for 'Alarm' and another for 'Trip'.

4.2.2 The contact rating of the potential free contacts shall be 1A at 240V AC & 0.1A at 220V
DC.Any auxiliary supply ,if required shall be indicated by the bidder.

4.2.3 The thermometers shall be located at a convenient height for easy reading and handling.

4.2.4 One bearing shall be insulated to prevent shaft currents.

4.3 DRAIN PLUGS

Motors shall be provided with drain plugs, so located to drain water, resulting from
condensation or due to other causes ,from all pockets in the motor casing.

4.4 FLOW SWITCHES

Flow switches shall be provided for monitoring cooling water flow if CACW motors are
specified.

4.5 VIBRATION PADS

Vibration pads shall be provided when called for in the specification.

5.0 TERMINAL BOX

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 NO. TCE CONSULTING ENGINEERS LIMITED SECTION: D
TCE-M4-203-02 TITLE
SHEET 3
INDUCTION MOTORS
ADDITIONAL REQUIREMENT FOR HV MOTORS

5.1 Separate terminal boxes shall be provided for each of the following :

5.1.1 Stator Leads

5.1.2 Rotor leads (wound motors)

5.1.3 Space Heaters

5.1.4 Temperature Detectors

5.2 The three phases shall be segregated by barriers of metal or fibre glass.

5.3 The cable box design shall be suitable for any type of cable termination kits available.

6.0 EARTHING PAD

The earthing pads shall be of non-corrodible metal welded or brazed at two locations on
opposite sides complete with suitable bolt and washers for connecting the
PURCHASER'S earthing flat.

7.0 RATING PLATE

7.1 The following details, in addition to those specified in applicable standards shall be
included on the rating plate.

7.1.1 Temperature rise of windings in degree centigrade at rated load, rated voltage, frequency
and ambient conditions and the method of measuring temperature rise. (Thermometer/
Winding resistance).

7.1.2 Type of bearings, recommended lubricant, lubricating interval & re-lubricating

quantity.

8.0 TESTS

8.1 Type test certificates for similar motors shall be furnished with the Bid.

8.2 Extra price for performing type tests on the motor as per applicable standard shall be
quoted.

8.3 If specified in data sheet-A, for motors rated 3.3 kV and above, the induced shaft
voltage shall be measured at the manufacturer's works during shop testing. The
maximum value of induced voltage in the motor shaft shall not exceed 250mV.

8.4 The polarisation index test shall be carried out on all motors rated at 3.3 kV and above.
The minimum value of the polarisation index shall be 2 when determined as per IS-7816.

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TCE-M4-203-02 TITLE
SHEET 4
INDUCTION MOTORS
ADDITIONAL REQUIREMENT FOR HV MOTORS

8.5 Coils of HV motors shall be tested as per IEC-34-15.

8.6 Loss tangent measurement of coils for motors rated 6.6 kV & above shall be done as per
IS-13508.

8.7 All other routine tests shall be carried out as per applicable standards.

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 NO. TCE CONSULTING ENGINEERS LIMITED SECTION: D
TCE-M4-203-02 TITLE
SHEET 1
INDUCTION MOTORS
ADDITIONAL REQUIREMENT FOR HV MOTORS
DATA SHEET-C

INFORMATION TO BE SUBMITTED BY THE VENDOR

AFTER AWARD OF CONTRACT

A .DOCUMENTS TO BE SUBMITTED FOR PURCHASER'S APPROVAL.

1.0 Technical particulars as per data sheet-B of TCE.M4.203-01 & 02

2.0 Bearing temperature indicator

2.1 Type and make

2.2 Number

2.3. Number of contacts in each indicator

2.4 Contact rating at 220V DC at 240V AC

3.0 A separate dimensioned outline and

general arrangement drawing of motor
shall be furnished indicating the following:
Name of Manufacturer,
Wight of motor (kg.)
Centre line of motor
Foundation details,
Openings ,embedment details in foundation for entry of
all cables such as power,space heater,etd etc.
Connection details of motor i.e, start/delta ,
terminal markings, clearance between phase,
disconnecting facilities and direction
of cable entry and cable glands (if provided).

3.1 Dimensions of terminal boxes for main

power leads, space heater leads and ETD
leads.

3.2 Size, type and overall diameter of cable

for which terminal boxes are suitable.

3.3 Openings and embedments in foundation

for cable entry for power leads, space
heater leads, ETD leads and earthing
conductor, etc. with relative locating
dimensions and sizes in all views of motor.

3.4 Location of bearing thermometers and

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TCE-M4-203-02 TITLE
SHEET 2
INDUCTION MOTORS
ADDITIONAL REQUIREMENT FOR HV MOTORS
DATA SHEET-C

pockets for the same.

3.5 No. & type (NO/NC) of contacts

provided on bearing thermometers.

3.6 Location and size of earthing

terminals/holes in earthing pads.

3.7 Coupling type, diameter of shaft

extension, dimensions of key slot
and details of half coupling
(if specified).

3.8 The following additional data/details should be

shown on the motor drawing, when applicable.

3.9 Cooling water requirement for water cooled

bearing (Lts/min).

3.10 Cooling water requirement for water cooled

windings (Lts/min).

3.11 Required pressure of cooling water (kg/cm 2).

3.12 Required maximum temperature of cooling water (oC).

3.13 Weight of cooler if removable (kg).

3.14 Oil level sight gauges for oil lubricated bearings

B. DOCUMENTS TO BE SUBMITTED FOR INFORMATION.

1.0 Insulation

1.1 Material and treatment of insulation

2.0 Winding

2.1 Stator winding

(a) Connection
(b) Resistance/phase

2.2 Rotor winding

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TCE-M4-203-02 TITLE
SHEET 3
INDUCTION MOTORS
ADDITIONAL REQUIREMENT FOR HV MOTORS
DATA SHEET-C

(a) Connection
(b) Resistance/phase

3.0 Bearing

3.1 DE Bearing

3.1.1 Type, No. & make

3.1.2 Lubricant

3.1.3 Initial quantity

3.1.4 Relubricating interval

3.1.5 Relubricating quantity

3.1.6 Anticipated life

3.2 NDE Bearing

3.2.1 Type, No. & make

3.2.2 Lubricant

3.2.3 Initial quantity

3.2.4 Relubricating interval

3.2.5 Relubricating quantity

3.2.6 Anticipated life

4.0 Motor bearing lubrication system -

Self lubrication/Forced oil lubrication

4.1 Forced oil lubrication system (if provided)

a) Whether this is compatible

with forced oil lubrication
system of driven equipment.

If NO, furnish the following

details for motor bearing

i) Type, make and specification of oil

ii) Flow rate (Ltrs/Sec)
iii) Pressure (Kg/cm2)

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TCE-M4-203-02 TITLE
SHEET 4
INDUCTION MOTORS
ADDITIONAL REQUIREMENT FOR HV MOTORS
DATA SHEET-C

iv) Quantity of lube oil pump sets

provided for each motor
v) Local control panel provided for
forced oil lubrication system of each
motor
vi) Make, type and name plate
particulars of lube oil pumps &
415V, 3 phase, 50Hz motors.
vii) Filters - Make & type

5.0 Air temperature detector (Internal)

(CACA/CACW motor)

5.1 Type & make

5.2 Number

5.3 Number of contacts in each indicator

5.4 Contact rating at - 220V DC

- 240V AC

6.0 Terminal box

6.1 Location of main terminal box

viewed from non drive end (Right/Left)

7.0 No load current of motor at rated

voltage & frequency (for each type
of motor)

8.0 Limiting rotor temperature for

determining safe stall time

10.0 Instruction Manual (Number of copies as per

distribution schedule)

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