变频电缆选型及变频技术和变频接地

We reserve all rights in this document and in the information contained therein. Reproduction,use or disclosure to third parties without express authority is strictly forbidden. ABB Utilities AB; 2002

ABB Marine

Cabling Instructions

SAVEDATE: 23.12.2002 13:01

Contents

1 Introduction (3)

2 General about Cables (3)

2.1 Installation (3)

2.2 Earth Fault Demands and Insulation (3)

2.3 Dimensioning (3)

3 High Voltage Cables (4)

3.1 General (4)

3.2 Cable Environment and Demands, One Phase Cables (6)

3.2.1 Generators, One Phase Cables (6)

3.2.2 Transformers, Motors and HV-Switchboards, One Phase Cables (7)

3.2.3 Transformer – Cycloconverter – Motor, One Phase Cables (8)

3.2.4 From HV-Switchboard or Transformer via ACS6000AD/SD to Motor, One Phase Cable (9)

3.2.5 Duplex Connections on Supply Side, One Phase Cable (10)

3.3 Cable Environment and Demands, Three Phase Cables (11)

3.3.1 From HV-switchboard or Transformer via ACS6000AD/SD to Motor, Three Phases (11)

3.3.2 HV-Switchboards, Generators, Transformers and Motors, Three Phase Cables (12)

3.3.3 Duplex Connections on Supply Side, Three Phase Cable (13)

4 Low Voltage Cables (14)

4.1 General (14)

4.2 Cable Environment and Demands (15)

4.2.1 From LV-Switchboard or Transformer via ACS600 to Motor, Three Phases (15)

4.2.2 Consumers (16)

5 Signal Cables (17)

5.1 General (17)

5.2 Cable Environment and Demands (17)

5.2.1 Signal Cable Connections (17)

6 Fieldbus Cables (18)

General (18)

6.2 Cable Environment and Demands (18)

6.2.1 Modbus (19)

6.2.2 Profibus (19)

6.2.3 Ethernet (19)

6.2.4 AF100 (19)

7 Other Optical Cables (21)

7.1 General (21)

7.2 Cable Environment and Demands (21)

7.2.1 DDCS (21)

7.2.2 Absolut Angle Encoder Link (21)

7.2.3 SatCom Link (21)

8 Reference Documents (22)

1 Introduction

The purpose of this document is to give general information on choosing cables in marine environment. Also, some of the most important regulations are introduced.

2 General about Cables

2.1 Installation

Cable installations must be done according to the rules of the Classification Societies, IEC standards and local safety regulations regarding cable installation in passenger vessels, icebreakers or special vessels with high voltage diesel electric propulsion system. Only cables that are accepted by the Classification Societies should be used.

High and low voltage cables and signal cables must be installed on separate cable trays and the distance between these trays must be over 50 cm. The cable crossings must be done as close to 90 degrees as possible to reduce the disturbances to minimum. The minimum distance between cables in crossings is 25 cm. If minimum distances can not be followed in installing, the cables must be installed in separate metallic tubes. The cable groups must be installed separately also inside the converter cabinet. The trays and the tubes must be properly earthed. The cables that are assembled in trays must be fixed properly according to the yards standards approved by the classifier. /1, 2, 3, 4/

The fire safety of the cables is defined in the next standards:

IEC 60332-1 and –3 self extinction

IEC 61034-1 and –2 flue gas

IEC 60754-1 and –2 halogens

incombustibility

IEC

60331

2.2 Earth Fault Demands and Insulation

When choosing the cable the need to use the cable in earth fault situation must be considered. In this situation the voltage class must be high enough against ground level. The insulation of the cable between earth and phase must be dimensioned according to the star voltage. The high and low voltage cables must have two layers of sheaths to protect the conductors against electrical disturbances: braid sheath around the conductor and overall sheath around one conductor or the whole conductor group. The outer overall sheath can also function as a shield that encloses the electrical field of a cable and protects the cable from external electrical fields. The signal and non-optical fieldbus cables have usually only this outer overall sheath. Armature is the outermost protection of the cable against mechanical stress. /5/

2.3 Dimensioning

The cable is chosen according to the nominal current. In the load-capacity of the cable affect: the highest allowed working temperature, the temperature of the environment, the mounting of cables and how close to each other the cables are installed.

On DC-drives from one up to four conductor cables are used in parallel or alone. Plus and minus conductors are installed in separate cable groups.

In short-circuit durability of the cable both thermal and dynamical short-circuit durability must be considered. The thermal short-circuit durability is measured according to maximum short-circuit current value in one second at the highest operating temperature.

The dynamical short-circuit durability affecting the cable mechanically must be dimensioned according to the transient current which is 2,5 times the initial short-circuit current.

The cable must also withstand the maximum short-circuit power of the network at least for the time delay taken by the protection system to operate.

The grouping of cables has also effect on the nominal current of the cables. The current rating of a cable usually drops when several cables are installed side by side. This possible drop of current rating