50-TMSS-02-R0

Augu Au gu st 6, 2006 G

50TMSS02R0/JSG

PAGE NO. NO. 1 OF 16

TRANSMISSION MATERIALS STANDARD SPECIFICATION

50-TMSS-02, Rev. 0

TABLE OF CONTENTS

1.0

SCOPE

2.0

CROSS REFERENCES

3.0

APPLICABLE CODES AND STANDARDS

4.0

DESIGN AND CONSTRUCTION REQUIREMENTS 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12

General Ratings Construction Capacitor Unit or Stack Electromagnetic Unit LV Terminal Box HV Porcelain Bushing HV Terminal Polarity and Terminal Markings Grounding Insulating Oil Nameplate

5.0

TESTS

6.0

DATA SCHEDULE

50TMSS02R0/JSG

Date of Approval: August 6, 2006 G

PAGE NO. 2 OF 16


1.0

50-TMSS-02, Rev. 0

SCOPE This SEC Transmission Material Standard Specification (TMSS) specifies the minimum technical requirements for design, engineering, manufacture, inspection, testing and performance of Capacitor Voltage Transformers (CVT) 110 kV through 380 kV intended to be used outdoors in the system of the Saudi Electricity Company, Saudi Arabia.

2.0

CROSS REFERENCES This Material Standard Specification shall always be read in conjunction with SEC General Specification No. 01-TMSS-01, titled "General Requirements for All Equipment/Materials", which shall be considered as an integral part of this TMSS. This TMSS shall also be read in conjunction with SEC Purchase Order or Contract Schedules for project, as applicable.

3.0

APPLICABLE CODES AND STANDARDS The latest revision/amendments of the following Codes and Standards shall be applicable for the equipment/material covered in this TMSS. In case of conflict, the vendor/manufacturer may propose equipment/material conforming to one group of Industry Codes and Standards quoted hereunder without jeopardizing the requirements of this TMSS. 3.1

IEC 60044-5

Capacitor Voltage Transformers

3.2

IEC 62155

Tests on Hollow Insulators for use in Electrical Equipment

3.3

IEC 60507

Artificial Pollution Tests on High-Voltage Insulators to be used in A.C.systems.

3.4

IEC 60529

Degrees of Protection Provided by Enclosures.

3.5

IEC 60867

Insulating liquids - Specifications for unused liquids based on synthetic aromatic hydrocarbons

3.6

IEEE C57.13

Standard Requirements for Instrument Transformers

3.7

IEEE C62.11

Standard for Metal-Oxide Surge Arrestors for AC Power Circuits ( > 1kV)

3.8

NEMA C93.1

Requirments for Power-Line Carrier Devices.

3.8

NEMA ICS 6

Enclosures for Industrial Control and Systems

3.9

ASTM D2296

Standard Specification for Continuity of quality of Electrical Insulating Polybutene Oil for Capacitors

50TMSS02R0/JSG


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3.10

4.0

54-TMSS-01

50-TMSS-02, Rev. 0

Mineral Insulating Oil for Electrical Apparatus

DESIGN AND CONSTRUCTION REQUIREMENTS 4.1

General The capacitor voltage transformer (CVT) shall be of manufacturer's standard design per IEC 60044-5 or NEMA C93.1 and shall meet or exceed the requirements of this Specification in all respects.

4.2

Ratings The ratings shall be as specified in Data Schedule. The rated insulation levels and maximum primary voltage for CVT shall be based on the highest voltage at emergency condition per 01-TMSS-01.

4.3

4.4

Construction 4.3.1

The CVT shall be of oil-filled, voltage connected type, rigid column structure and freestanding unit (base mounted) for outdoor service.

4.3.2

The CVT for 380 kV nominal system voltage shall be supplied with a corona ring.

4.3.3

The CVT shall be adequately designed and constructed to withstand insulator-washing pressure of 3500 kPa without damage and without ingress of water or moisture into the apparatus internals, or degradation of the sealing.

4.3.4

Rated Voltage factor shall be as per IEC 60044-5 unless otherwise specified in the data schedule.

4.3.5

The capacitor and EMU units of the CVT shall be hermatically sealed.

Capacitor Unit or Stack 4.4.1

50TMSS02R0/JSG

The capacitor unit or stack shall consist of series connected oil impregnated capacitor elements C1 (high voltage capacitor) and C2 ( Intermediate voltage capacitor) housed in porcelain bushing completely filled with oil and hermetically sealed. Each capacitor unit or stack shall be fitted with stainless steel bellows (oil volume adjusting device) to allow for change in volume of oil and maintain a slightly positive oil pressure at any temperature in the operating range.


PAGE NO. 4 OF 16


4.5

4.6

50-TMSS-02, Rev. 0

4.4.2

The capacitor unit or stack used with the voltage transformer shall have a capacitor divider with intermediate voltage terminal for connection to electromagnetic unit. The insulation of the low voltage terminal of the capacitor voltage divider shall be tested for one minute per IEC 60044-5 or NEMA C93.1.

4.4.3

The over voltage surges transmitted from primary to secondary terminals of CVT shall not exceed the values given against Type A and Type B per IEC 60044-5 or equivalent standard for CVT installed in air-insulated Substation and gas insulated metal-enclosed substation (GIS) respectively.

4.4.4

The low voltage end shall be terminated in a bushing insulated from the base and capable of withstanding a test voltage of 10kV for 1 minute.

Electromagnetic Unit 4.5.1

The electromagnetic unit shall consist of intermediate voltage transformer, compensating reactor, and associated protection circuitry. The electromagnetic unit shall be housed in the base on which the capacitor unit or stack is mounted on the top.The base housing shall be filled with oil and hermetically sealed.

4.5.2

The voltage transformer shall have two secondary windings. The rated secondary voltage (nominal) of each winding shall be 115/ √3 V or 110/ √3 V or as specified in data schedule. All secondary circuits of voltage transformer shall be provided with fuses or MCBs .

4.5.3

The CVT for relaying service shall have a rated burden of at least 100 VA at a power factor of 0.85 lagging and shall be of standard accuracy class 3P per IEC 60044-5 or 1.2R accuracy class per NEMA C93.1. Additional accuracy classes ( T1, T2, T3 per IEC 60044-5) for transient performance for CVT for relaying service shall be as specified in the data schedule. The CVT for metering service (except for revenue) shall have an accuracy class 0.5 per IEC 60044-5 or accuracy class 0.3 for burdens X, Y, and Z and power factor per NEMA C93.1. The CVT for revenue metering service shall have accuracy class of 0.2 per IEC 60044-5 and shall be capable of simultaneous loading of accuracy of 0.2 per IEC 60044-5for all secondary windings up to their rated burden and power factor.

LV Terminal Box 4.6.1

50TMSS02R0/JSG

The voltage transformer secondary terminals and fuses/MCBs, damping devices (for limiting over voltages, preventing sustained ferro-resonance and acheiving a higher performance of transient response of CVT for relaying per IEC 60044-5 or NEMA C93.1), protective devices and thermostatically controlled space heater shall be enclosed in the LV terminal box which shall be part of the base housing enclosure.


PAGE NO. 5 OF 16


4.7

4.8

50-TMSS-02, Rev. 0

4.6.2

The internal face of the cover shall bear a metallic plate with the schematic diagram of windings and of their terminal markings.

4.6.3

4.6.3 Terminals on terminal board or terminal block for user's field wiring connections shall be non-captive pan head screw type.

4.6.4

The bottom plate of terminal box shall be furnished with cutout complete with undrilled cable gland plate to accommodate cable gland of up to 40 mm external diameter. Provisions for conduit entrance shall be provided.

4.6.5

The enclosure shall be weatherproof and dust-tight having degree of protection in accordance with 01-TMSS-01.

4.6.6

An external earthing stud capable of accepting twin-copper conductor of 240mm2 connected to the metal base shall be provided on all units.

4.6.7

The CVT shall have an earthing terminal provided within the secondary terminal box for earthing the secondary windings and cable screens.

HV Porcelain Bushing 4.7.1

The HV porcelain shall be of electrical grade wet-processed porcelain, and shall be as specified in Data Schedule. The porcelain bushing shall be designed and constructed to withstand static and dynamic load.

4.7.2

Outdoor apparatus porcelain bushing shall be designed to have a creepage distance per 01-TMSS-01. Color of the bushing shall be brown.

HV Terminal The CVT shall be provided with standard high voltage NEMA CC1 ,4-hole terminal pad or equivalent. The HV terminal pad shall be tin-plated and shall be suitable for use with copper or aluminum terminal connectors.

4.9

Polarity and Terminal Markings The relative polarity of the leads and terminals of the CVT shall be clearly identified by permanent markings that cannot be easily obliterated, and shall be designated in accordance with IEC 60044-5 or NEMA C93.1.

4.10

Grounding The CVT shall be provided with a clamp type ground terminal located on the external surface of the CVT base, and shall be sized to accommodate bare copper conductor of size 1x240mm 2 for station fault current level upto 40 kA and 2x240mm2 for fault current levels above 40 kA.

50TMSS02R0/JSG


PAGE NO. 6 OF 16


4.11

50-TMSS-02, Rev. 0

Insulating Oil 4.11.1 The capacitor unit or stack shall be filled-up with synthetic oil conforming to class III sheet 1 per IEC 60867 or ASTM-D-2296 and shall not contain Polychlorinated Biphenyl (PCB) substance. CVT with synthetic oil per sheet 4 of IEC 60867, having at least 5 years of proven field experience can also be offered for review and final acceptance by SEC. 4.11.2 The electromagnetic unit shall be filled-up with mineral oil conforming to 54TMSS-01.

4.12

Nameplate 4.12.1 Each CVT and/or capacitor shall bear a nameplate permanently and legibly marked in English with the information listed in IEC 60044-5 or NEMA C93.1, plus additional information as follows: a.

The words “ kV Capacitor Voltage Transformer” / “ µF Capacitor”.

b.

SEC Purchase Order Number, Contract No. or J.O. Number.

c.

50-TMSS-02, Rev. 0.

4.12.2 Nameplate of CVT manufactured per NEMA C93.1 shall additionally have indication of primary, neutral and each secondary winding terminal. 4.12.3 The nameplate material shall be stainless steel and shall be fastened to the equipment by stainless steel screws or rivets.

5.0

TESTS All test results shall be submitted to SEC for review and approval. 5.1

Type (Design) Tests 5.1.1 All design (type) tests prescribed in IEC 60044-5 or NEMA C93.1 shall be performed on the representative unit or on the first unit of every new design or rating to be supplied to SEC. 5.1.2

50TMSS02R0/JSG

Chopped impulse test shall be carried out additionally for all CVTs manufactured per NEMA C93.1 standard.


PAGE NO. 7 OF 16


5.2

5.3

Routine (Production) Tests 5.2.1

All production (routine) tests prescribed in IEC 60044-5 or NEMA C93.1 shall be performed on all CVTs and /or capacitors.

5.2.2

Partial Discharge measurement shall be carried out additionally for all CVTs manufactured per NEMA C93.1 standard.

Special Tests 5.3.1

5.4

50-TMSS-02, Rev. 0

The following special tests shall be carried out on one representative CVT per IEC 60044-5 or equivalent ANSI/IEEE, if specified in Technical data Schedule. a.

Measurement of the transmission factor of high frequency overvoltages.

b.

Mechanical strength test

c.

Determination of the temperature coefficient.

d.

Tightness design test of capacitor units.

Apparatus Porcelain Bushing 5.4.1 All tests per IEC 62155 or equivalent ANSI/IEEE standard shall be performed on apparatus porcelain bushing.

5.4.2

Artificial Pollution Tests shall be performed on one representative bushing using Solid Layer Method per IEC 60507 or equivalent ANSI/IEEE Standard, if specified in the data schedule.

50TMSS02R0/JSG


PAGE NO. 8 OF 16

50-TMSS-02, Rev. 0


6.0

DATA SCHEDULE

CVT APPLICABLE FOR 110 KV TO 380 KV SEC Enquiry No.

Date:

SEC Purchase Order No. or Contract No.

Date:

SEC PTS No./Project Title with J.O. No. REFERENCE SECTION NO.

DESCRIPTION

'A'

'B'

'C'

Nominal System Voltage (kV rms) (110,115, 132, 230, 380) System Fault Current Level (at rated system voltage (kA rms) Type of System Grounding (Solidly grounded neutral, resistance grounded, others) 3.0

APPLICABLE CODES AND STANDARDS Applicable Industry Standards

4.0

4.2

*

DESIGN AND CONSTRUCTION REQUIREMENTS Name of the manufacturer of CVT

*

Type or Model Number

*

Ratings Maximum primary voltage (kVrms) Rated primary voltage (kVrms) (Phase to Ground)

'A'- SEC SPECIFIED DATA/PARAMETER. 'B'- BIDDER/SUPPLIER/VENDOR/CONTRACTOR PROPOSED DATA/PARAMETERS. 'C'- REMARKS SUPPORTING THE PROPOSED DEVIATION IN COLUMN 'B'. (*)- DATA/PARAMETER TO BE PROVIDED/PROPOSED BY THE BIDDER/SUPPLIER/ VENDOR/CONTRACTOR IN COLUMN 'B'.

50TMSS02R0/JSG


PAGE NO. 9 OF 16

50-TMSS-02, Rev. 0


6.0

DATA SCHEDULE

CVT APPLICABLE FOR 110 KV TO 380 KV REFERENCE SECTION NO.

4.2

DESCRIPTION

'A'

'B'

'C'

(Cont’d) Voltage Transformation Ratio Accuracy Class :

Secondary 1 Secondary 2

Class for Transient response performance of CVT for relaying service Rated Secondary Burden: Secondary 1 (VA) Secondary 2 (VA) Max. Simultaneous (VA)

*

Continuous Thermal Burden (VA)

*

Rated Voltage Factor Continuous operation Short time (30s) operation

* *

BIL of CVT (kV peak)

*

BSL of CVT (kV peak) (for 380kV System)

*

Power Frequency withstand Voltage (kV rms)

*

Maximum Partial Discharge Level of capacitor voltage divider@ kV (pC)

*

Maximum Radio Influence Voltage of capacitor voltage divider (for 110kV & above) (RIV) at kV (µV) CVT Application Transmitted Over Voltage (Type A or Type B) per clause 7.5.2 of IEC 60044-5)

50TMSS02R0/JSG

2500 AIS/GIS *


Type A /Type B

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50-TMSS-02, Rev. 0


6.0

DATA SCHEDULE


4.4

4.5

DESCRIPTION

'A'

'B'

'C'

Capacitor Unit or Stack Number of Capacitor units or stacks

*

Dissipation factor (tan δ) of Capacitor stacks

*

Temperature co-efficient of Capacitor stacks

*

Rated Capacitance: Capacitor divider at 60Hz (pF) C1 (high voltage capacitor) (pF) C2 (Intermediate voltage capacitor) (pF)

* * *

Mounting

*

Weight of complete CVT (Kgs)

*

Operating Temperature Range (°C)

*

Insulation of the low voltage terminal of the capacitor voltage divider(kVrms)

*

Electromagnetic Unit No of taps availabe for secondary winding Rated Secondary Voltage of each Winding (V rms) BIL (kV peak)

*

Power Frequency Withstand Voltage: 1 min. dry (kV rms) 10 sec. wet (kV rms)

* *

50TMSS02R0/JSG


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50-TMSS-02, Rev. 0


6.0

DATA SCHEDULE


DESCRIPTION

4.5 Number of Secondary Windings Contd. Winding insulation and class

4.7

4.8

'A'

'B'

'C'

* *

Winding material (Al or Cu)

*

Secondary fuse/MCB rating (A)

*

LV Terminal Box Type of Degree of protection of enclosure

*

Space heater :

*

Power (W)

*

Voltage (Vrms)

*

HV Porcelain Bushing Name of manufacturer

*

Type and designation number

*

Rated Voltage (Nominal) (KV rms) BIL (kV peak)

*

BSL (kV peak) (for 380 kV System)

*

Power Frequency Withstand Voltage: 1 min. dry (kV rms) 10 sec. wet (kV rms)

* *

Creepage distance (mm)

*

Flashover distance (mm)

*

Color

*

50TMSS02R0/JSG


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50-TMSS-02, Rev. 0


6.0

DATA SCHEDULE


4.8

4.9

DESCRIPTION

'A'

'B'

'C'

(Cont’d) Cantilever Strength (kg)

*

Maximum Horizontal Terminal pull in 150 km/hr wind (kg)

*

Corona ring provided?

*

Yes / No

HV Terminal For Conductor : Size (mm²) Type No. of conductor/phase HV Terminal Pad : Type Pad dimension (mm x mm) Thickness (mm) No. of holes Hole diameter (mm) Material

4.10

Grounding Clamp type ground terminal provided?

4.11

* * * * * *

*

Insulating Oil [Refer to Data Schedule of 54-TMSS-01 and fill in Column 'B' for mineral oil in Electromagnetic Unit. For synthetic oil in Capacitor unit or stack, vendor to fill in Column 'B' of the following.] Type of Oil

*

Make Designation

*

Manufacturer

*

Class of Oil

*

50TMSS02R0/JSG


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50-TMSS-02, Rev. 0


6.0

DATA SCHEDULE


4.11

DESCRIPTION

'A'

(Cont’d) Industry Standard

*

Appearance

*

Color, max. (initial) (if applicable)

*

Density at 20°C (Kg/cm³) (if applicable)

*

Specific Gravity at 15.6/15.6°C, min. (if applicable)

*

Flash Point, min. (°C)

*

Pour Point, max. (°C)

*

Kinematic Viscosity at : 40°C (mm²/s) 100°C(cSt)

* *

Water content as shipped max.(mg/kg or ppm)

*

Chlorine Content (mg/Kg) (if applicable)

*

Inorganic chlorides and sulfates (if applicable)

*

Neutralization Value, max. (mg KOH/g)

*

Corrosive sulphur

*

Dielectric Breakdown Voltage, min. (kV)

*

Volume Resistivity at 90°C, min. (T Ω.m) (if applicable)

*

Resistivity, initial at 100°C, min. (ohm-cm) (if applicable)

*

50TMSS02R0/JSG


'B'

'C'

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50-TMSS-02, Rev. 0


6.0

DATA SCHEDULE


4.11

DESCRIPTION

( Cont’d) Dielectric dissipation factor, tan δ at 90°C and 40 Hz to 60 Hz, max. (if applicable)

*

Stability under electrical stress and ionization (gassing) Absorption, min. (Method A) (mm³/min.) (if applicable)

*

Power Factor, initial, 60 Hz, at 100°C, max. (if applicable)

*

Aging Test (after Heating 96 h at 115°C) (if applicable) : - Color, max. - Neutralization Value, max. (mg KOH/g) - Power Factor, 60 Hz at 100°C, max.

5.0

'A'

'B'

'C'

* * *

Resistivity at 100°C, min. (ohm - cm)

*

PCB content

*

TESTS Artificial Pollution tests shall be performed on one of the representative bushing.

Yes / No

Special Tests to be carried out

50TMSS02R0/JSG


PAGE NO. 15 OF 16

50-TMSS-02, Rev. 0


6.0

DATA SCHEDULE

CVT APPLICABLE FOR 110 KV TO 380 KV A.

ADDITIONAL TECHNICAL INFORMATION OR FEATURES TO BE FURNISHED BY SEC:

B.

ADDITIONAL SUPPLEMENTARY DATA OR BIDDER/VENDOR/SUPPLIER/CONTRACTOR:

C.

OTHER PARTICULARS TO BE FILLED UP BY BIDDER/VENDOR/SUPPLIER/ CONTRACTOR:

FEATURES

Actual Manufacturer of Equipment/Material

PROPOSED

BY

Vendor/Supplier/ Contractor

Name of the Company Location and address

Name and Signature of authorized representative and date

Official Seal/Stamp of the Company & Date

50TMSS02R0/JSG


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50-TMSS-02-R0

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