3.3.6_V112 Electrical Description 0006-6958_V00

Document no.: 0006-6958 V00

V112-3.0 MW Electrical Description

Technical Description and Data Manual

Date: 2010-03-10

Issued by: Technology R&D Class: 2

Type: T09 - Manual Page 1 of 14

Vestas Wind Systems A/S · Alsvej 21 · 8940 Randers SV · Denmark · www.vestas.com

QM

S 0

0085 V

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V112-3.0 MW Electrical Description Technical Description and Data Manual

History of this Document

Version

no.

Date Description of changes Technical

approver

00 2010-03-10 First edition.

Technical approver for chapter 2+5. JARNE

Technical approver for chapter 3+4. JNIES

Technical approver for chapter 7+8+9. KESKA

Table of Contents

1 Introduction .......................................................................................................................... 2 1.1 Purpose of Manual ................................................................................................................. 2 1.2 Qualifications and Training Programme ................................................................................. 2 1.3 Contact Addresses................................................................................................................. 2 1.4 Symbols and Conventions ..................................................................................................... 2 1.5 Safety Notes .......................................................................................................................... 2 1.6 Abbreviations and Terms ....................................................................................................... 3 1.7 Reference Documents ........................................................................................................... 3 1.7.1 Documents ............................................................................................................................ 3 1.7.2 Drawings ................................................................................................................................ 3 1.7.3 Electrical Diagrams ................................................................................................................ 3 2 High-Voltage Grid Connection ............................................................................................ 3 2.1.1 Grid Connection Data ............................................................................................................ 4 3 The Switchgear Module ....................................................................................................... 4 3.1.1 The Circuit Breaker Panel (CBP) ........................................................................................... 4 3.1.2 The Switch Disconnector Panel (SDP) ................................................................................... 6 3.1.3 High-Voltage Level Range and Internal Arc Classification ...................................................... 6 3.1.4 Rated Nominal Current for Main Busbar ................................................................................ 6 3.1.5 Technical Data ....................................................................................................................... 7 3.1.6 Switchgear Motorisation ......................................................................................................... 8 4 High-Voltage Cables ............................................................................................................ 8 5 Turbine Transformer ............................................................................................................ 8 5.1 Transformer Data ................................................................................................................... 8 5.1.1 Basic Transformer Data ......................................................................................................... 8 5.1.2 Transformer 10.5 kV 50 Hz .................................................................................................... 9 5.1.3 Transformer 20 kV 50 Hz ..................................................................................................... 10 5.1.4 Transformer 33 kV 50 Hz ..................................................................................................... 11 6 The Vestas Earthing System / Lightning Protection ....................................................... 12 7 Turbine Marking ................................................................................................................. 12 8 Short Circuit Protection ..................................................................................................... 12 9 Monitoring of the Grid ....................................................................................................... 14

VESTAS PROPRIETARY NOTICE: This document contains valuable confidential information of Vestas Wind Systems A/S. It is protected by copyright law as an unpublished work. Vestas reserves all patent, copyright, trade secret, and other proprietary rights to it. The information in this document may not be used, reproduced, or disclosed except if and to the extent rights are expressly granted by Vestas in writing and subject to applicable conditions. Vestas disclaims all warranties except as expressly granted by written agreement and is not responsible for unauthorized uses, for which it may pursue legal remedies against responsible parties.

Document no.: 0006-6958 V00 V112-3.0 MW Electrical Description


Date: 2010-03-10




1 Introduction

This document applies to the following equipment supplied by Vestas Wind

Systems A/S (VWS):

Turbine

V112–3.0 MW

Table 1-1: Turbine type.

1.1 Purpose of Manual

This manual describes the high-voltage electrical systems in general for the

turbines described in chapter 1.

The contents of this document are subject to change without notice.

1.2 Qualifications and Training Programme

Not applicable for this manual.

1.3 Contact Addresses

Head office:

Vestas Wind Systems A/S

Alsvej 21

8940 Randers SV

Denmark

Telephone: +45 97 30 00 00

Local contact:

1.4 Symbols and Conventions


1.5 Safety Notes


NOTE



Date: 2010-03-10




1.6 Abbreviations and Terms

Abbreviations which relate to specific, detailed technical specifications and terms

are not spelled out.

Abbreviation/Term Spelled-out form/explanation

CBP Circuit Breaker Panel.

SDP Switch Disconnector Panel.

VWS Vestas Wind Systems.

Table 1-2: Abbreviations.

1.7 Reference Documents

1.7.1 Documents

0000-3388 Vestas Earthing System.

961636 Vestas Earthing System – Equipotential Connections On Cables.

960453 Quality Control of Equipotential Connections On Cables.

0007-9455 Earthing System (Standard Gravity P&H Foundation).

0009-0750 Foundation Earthing.

0009-8026 Earthing Between Turbines.

944430 Lightning Protection System.

1.7.2 Drawings

75942520 Embedment V112

1.7.3 Electrical Diagrams

0005-1681 3MW V112 EDSA SINGLE LINE DIAGRAM

2 High-Voltage Grid Connection

The turbine can be connected to the grid in the range from 6 kV to 35 kV, where

41.5 kV (Um) is the highest equipment voltage.

The grid cables are led into the turbine through a tube in the turbine foundation

and connected to the switchgear module.

The grid voltage must be within ±10%. Steady variations within +1/-2 Hz are

acceptable. Intermitted or rapid fluctuations of the grid’s frequency may cause

serious damage to the turbine.

On average, grid dropouts must only take place once a week in the course of the

turbine’s lifetime.



Date: 2010-03-10




2.1.1 Grid Connection Data

Grid Connection Data Value

Nominal Phase Voltage (UP, nom) Nominal high-voltage levels

Nominal Frequency (Fnom) 50 Hz

Maximum Steady State Voltage Jump ±2 %

Maximum Frequency Gradient ±4 Hz/sec.

Maximum Negative Sequence Voltage 3 %

Table 2-1: Grid Connection Data.

3 The Switchgear Module

The switchgear module is located at the tower bottom.

The switchgear module consists of a CBP followed by a number of SDPs

depending on the number of in/outgoing high-voltage cables. If decided/needed,

a double T-connection can be applied in each SDP.

The total number of SDPs can be 3, meaning that the total number of panels are

4 (1xCBP+3xSDP).

3.1.1 The Circuit Breaker Panel (CBP)

Figure 3-1: Circuit breaker and three-

position disconnector. Figure 3-2: Circuit breaker and two-

position disconnector with a separate earthing switch.



Date: 2010-03-10




Figure 3-3: Circuit breaker in

combination with a disconnector.

Figure 3-4: Circuit breaker and three-position disconnector (upstream).

The CBP is a combination of a circuit breaker and either a three-position

disconnector or a two-position disconnector with a separate earthing switch.

Refer to Figure 3-1, p. 4, Figure 3-2, p. 4, Figure 3-3, p. 5 and Figure 3-4, p. 5.

By means of a flexible high-voltage cable, the CBP is connected to the

transformer located in the nacelle.



Date: 2010-03-10




3.1.2 The Switch Disconnector Panel (SDP)

Figure 3-5: Three-position load break

switch-disconnector. Figure 3-6: Two-position load break

switch-disconnector with a separate earthing switch.

The SDPs are equipped with either a three-position load break switch-

disconnector (refer to Figure 3-5, p. 6) or a two-position load break switch-

disconnector with a separate earthing switch (Figure 3-6, p. 6).

The SDPs are connected to the in/outgoing high-voltage grid cables.

The SDPs are mainly used to separate or connect the next turbine.

3.1.3 High-Voltage Level Range and Internal Arc Classification

Rated Voltage

(Maximum

voltage)

Nominal

Operating

Voltage

Internal Arc

Classification

Tested According

to Classification

24 kV 10.0-22.0 kV IAC AFL 20 kA, 1s Switchgear

vessel/tank + cable

compartment

36 kV 22.1-33.0 kV IAC AFL 25 kA, 1s Switchgear

vessel/tank + cable

compartment

40.5 kV 33.1-35.0 kV IAC AFL 25 kA, 1s Switchgear

vessel/tank + cable

compartment

Table 3-1: High-voltage level range and internal classification.

3.1.4 Rated Nominal Current for Main Busbar

The rated nominal current for the main busbar is 630 A.



Date: 2010-03-10




3.1.5 Technical Data

Rated voltage (maximum voltage). kV 24 36 40.5

Rated frequency. Hz 50/60 50/60 50/60

Rated power frequency withstand voltage “phase-to-phase, phase-

to-earth”.

kV

50 70 85

Rated power frequency withstand voltage “across the isolating

contact”.

kV

60 80 90

Rated lightning impulse withstand voltage “phase-to-phase, phase-

to-earth”.

kV

125 170 185

Rated lightning impulse withstand voltage “across the isolating

contact”.

kV

145 195 215

Rated peak withstand current. kA

2.5 times rated short-

time withstand current.

Rated short-circuit making current. kA 2.5 times rated short-

time withstand current.

Circuit breaker switching capacity:

Electrical endurance classification for rated breaking current. E1

Electrical endurance classification for short-circuit breaking

current.

E1

Mechanical endurance classification. M1

Load-break switch-disconnector switching capacity:

Electrical endurance classification for rated breaking current. E3 E1 E1


current.

E3 E1 E1

Mechanical endurance classification. M1 M1 M1

Disconnector switching capacity:


current.

E2


Earthing switch switching capacity:


current.

E2


Ambient temperature:

For operation. -35° to +50°

For survival. -40° to +60°

Switchgear installation altitude above sea level. 2000 m.a.s.l.

Degree of protection:

Primary part (main circuit). IP65

Operating mechanisms (behind front cover). IP2X

Front cover and LV compartment. IP2X

Corrosion protection class. C3

Table 3-2: Technical data.



Date: 2010-03-10




3.1.6 Switchgear Motorisation

The switchgear module is equipped with motorisation for the load break switch-

disconnector in each SDP and for the circuit breaker in the CBP. The earthing

switch in each panel is not motorised.

Motor rating 24 VDC

Table 3-3: Motor rating.

4 High-Voltage Cables

The switchgear module and the turbine transformer are connected by means of a

high-voltage cable.

The cable is designed according to IEC 60502-2 and IEC 60840.

The cable has a conductor cross section of 3x70/70 mm2 Cu, where each three-

phase conductor is 70 mm2 and the earth conductor is 70 mm2. The cable is

delivered on site with terminations intended to connect to both the transformer

high-voltage side and the switchgear module.

5 Turbine Transformer

The turbine transformer is located in a dedicated and locked transformer room in

the nacelle.

The transformer room is equipped with four arc detection devices. In case a fault

is detected, the switchgear module (located at the tower bottom) will disconnect

the power supply to the transformer.

The transformer is a three-phase dry-type transformer which is self-extinguishing.

The high-voltage side of the transformer is connected to the circuit breaker panel,

located at the tower bottom, by means of flexible high-voltage cables.

Surge arresters are installed on the high-voltage side and the low-voltage side of

the transformer.

Surge arresters for the low-voltage side of the transformer are located on the low-

voltage busbar between the low-voltage switchboard and the transformer.

The low-voltage side of the transformer is connected to a circuit breaker by

means of flexible cables. The circuit breaker functions as a protection of the

turbine generator.

5.1 Transformer Data

5.1.1 Basic Transformer Data

Three-phase transformer.

Temperature monitoring of the transformer winding by PT100 sensor (two per

phase).

Temperature monitoring of the transformer core by PT100 sensor (two per

phase).

High-voltage surge arresters are installed on both the high-voltage side and

the low-voltage side.



Date: 2010-03-10




Transformer design, manufacturing, routine tests and tolerances are

according to IEC standard 60076-11 and HD 637 S1: 1999.

5.1.2 Transformer 10.5 kV 50 Hz

Transformer data, 10.5 kV 50 Hz

Rated power 650V : Sr = 3350 kVA (AF - Air Forced)

Frequency : f = 50 Hz

Primary voltage : U = 10500 V

Secondary voltage : Us = 650 V

No load losses : P0 ≤ 6.6 kW

Impedance losses at rated load (120°C) : Pl(120°C) ≤ 24.5 kW

Impedance voltage 650V, 3350kVA : ek ≥ 8 %

Short circuit current 650V, 3350kVA : Imax,3p ≤ 21 kA

Full load current at 10.5 kV : I10,5kV = 184/205 A (Cos=1/0,96)

Enclosure protection : = IP00

Corrosion protection : = C4 according to ISO 9223

Tap changer : ntp = ±2x2,5 %

Highest equipment voltage : Um = 12 kV

Power frequency voltage (50 Hz,1 min.) : Ud = 28 kV (RMS)

Lightning impulse voltage BIL (1,2/50 µs) : Up = 75 kV

LV clearance voltage : = 1.1 kV

LV test voltage (50 Hz, 1 min.) : = 3 kV

Connection : = Dyn5 or optional Dyn11 and

YNyn0

Weight : < 8500 kg

Max. ambient temperature : = 50°C

Max. daily average temperature : = 40°C

Max. yearly average temperature : = 30°C

Max. temperature rise (hotspot) : T(Pt100) = 80 K

Cut out of generator (hotspot) : T(Pt100) = 125°C

Cut out of HV-grid (hotspot) : T(Pt100) = 140°C

Temperature class : = F

Environment class : = E2

Climate class : = C2

Fire behaviour class : = F1

Maximum allowable installation height : = 2000 m above sea level

Table 5-1: Transformer data, 10.5 kV 50 Hz.



Date: 2010-03-10




5.1.3 Transformer 20 kV 50 Hz

Transformer data, 20 kV 50 Hz







Impedance voltage 650V, 3350kVA : ek ≤ 8 %


Full load current at 20 kV : I20kV = 97/108 A (Cos=1/0,96)



Tap changer : ntp = ±2x2.5 %

Highest equipment voltage : Um = 24 kV

Power frequency voltage (50 Hz,1 min.) : Ud = 45 kV (RMS)

Lightning impulse voltage BIL (1,2/50 µs) : Up = 125 kV




YNyn0

Weight : < 8500 kg












Table 5-2: Transformer data, 20 kV 50 Hz.



Date: 2010-03-10




5.1.4 Transformer 33 kV 50 Hz

Transformer data, 33 kV 50 Hz







Impedance voltage 650V, 3350kVA : ek ≥ 8 %


Full load current at 35 kV : I35kV = 55/62 A (Cos=1/0,96)



Tap changer : ntp = ±2x2.5 %

Highest equipment voltage : Um = 41.5 kV

Power frequency voltage (50 Hz,1 min.) : Ud = TBD

Lightning impulse voltage BIL (1,2/50 µs) : Up = TBD




YNyn0

Weight : < 8500 kg












Table 5-3: Transformer data, 33 kV 50 Hz.



Date: 2010-03-10




6 The Vestas Earthing System / Lightning Protection

For detailed information of the earthing system and lightning protection system

refer to 1.7 Reference Documents, p. 3.

7 Turbine Marking

8 Short Circuit Protection

Breakers Breaker for Aux. Power

Type:

T4L 250A TMD 4P

Breaker for Converter

Modules Type:

T7M1200L PR332/P LSIG

1000A 3P

Breaking capacity,

Icu

Ics

70 kA @ 690 V

70 kA @ 690 V

50 kA @ 690 V

50 kA @ 690 V

Making capacity, Icm 154 kA @ 690 V 105 kA @ 690 V

L, overload –

time delay

t1

175-250 A

K.

480-1200 A

3-144 sec.

S, short circuit –

time delay

t 2

N/A

N/A

0.72-12 kA

0.1-0.8 sec.

I, short circuit – 1.25-2.5 kA 1.8-18 kA

Vestas Wind Systems A/S

Alsvej 21 DK-8900 Randers

Tlf. +45 97300000 Fax. +45 97300001

Wind turbine type: V90-3.0MW

Controller type: VMP 6000

Voltage: 3x650 V +10/-10%

Frequency: 50 Hz +1/-3 Hz

Current 650V: 2665 A

Max. short circuit current 650V: IK = 42 kA



Date: 2010-03-10




Breakers Breaker for Aux. Power

Type:

T4L 250A TMD 4P

Breaker for Converter

Modules Type:

T7M1200L PR332/P LSIG

1000A 3P

instantaneous

t 3

K

K

G, earth fault –

time delay

t 4

N/A

0.1-0.8 sec.

240-1200 A

0.1-0.8 sec.

Table 8-1: Detailed information about the short circuit protection.



Date: 2010-03-10




9 Monitoring of the Grid

The grid is constantly monitored by the turbine controller. In case of a grid fault,

the generator and its supporting systems will be disconnected from the grid.

In case the voltage supply for the turbine controller is disconnected, the

emergency stop circuit will be opened immediately disconnecting the generator

and its supporting systems simultaneously.

The generator and its supporting systems will be disconnected from the grid if:

Voltage is above 110 % of nominal voltage for 60 seconds.

Voltage is above 115 % of nominal voltage for 2 seconds.

Voltage is above 120 % of nominal voltage for 0.08 seconds.

Voltage is above 125 % of nominal voltage for 0.005 seconds.

Voltage is below 90 % of nominal voltage for 60 seconds.

Voltage is below 85 % of nominal voltage for 11 seconds.

Frequency is above 53 Hz for 0.2 seconds.

Frequency is below 47 Hz for 0.2 seconds