ABB VD4 Series Quick guide

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1. For your safety!
• Make sure that the installation room (space and
environment) is suitable for the electrical
apparatus.
• Check that all the installation, putting into
service and maintenance operations are carried
out by qualified personnel with suitable
knowledge of the apparatus.
• Make sure that the standard and legal
prescriptions are complied with during
installation, putting into service and
maintenance, so that installations are performed
according to the rules of good working practice
and safety in the work place.
• Strictly follow the information in this instruction
manual.
• Check that the rated performance of the
apparatus is not exceeded during service.
• Check that the personnel operating the
apparatus have this instruction manual at hand
as well as the necessary information for correct
use.
• Pay special attention to the danger notes
indicated in the manual by the following safety
notifications:
SAFETY
NOTIFICATIONS
RESPONSIBLE BEHAVIOUR SAFEGUARDS YOUR
OWN AND OTHERS’ SAFETY!
FOR ANY REQUESTS, PLEASE CONTACT THE ABB
MEDIUM VOLTAGE SERVICE.
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MEDIUM VOLTAGE SERVICES
VD4 Digital addendum
to VD4 installation and service instructions
Index
001 1. For you safety!
003 2. Applicability and characteristics
004 3. Description
006 4. Selection and ordering
008 5. Specific characteristics of the product
011 6. Installation
013 7. Overall dimensions
020 8. Maintenance

“NOTICE” indicates a statement of company
policy as it relates to the safety of personnel
or protection of property.
Safety notations alert personnel to possible
death, injury or property damage situations.
The safety notations appear before the step in
which the condition applies.
The one safety notice and three hazard levels
notations are:
“WARNING” INDICATES A HAZARDOUS
SITUATION THAT HAS SOME PROBABILITY OF
SEVERE INJURY AND SUBSTANTIAL PROPERTY
DAMAGE.
“DANGER” INDICATES A HAZARDOUS
SITUATION THAT HAS A HIGH PROBABILITY OF
DEATH, SEVERE INJURY, AND SUBSTANTIAL
PROPERTY DAMAGE.
“CAUTION” INDICATES A HAZARDOUS
SITUATION THAT MAY RESULT IN MINOR OR
MODERATE INJURY AND/OR PROPERTY
DAMAGE.
CAUTION
—
1. For your safety!
WARNING
DANGER
2VD4 DIGITAL ADDENDUM - TO VD4 INSTALLATION AND SERVICE INSTRUCTIONS

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2. Applicability and characteristics
VD4 Digital Instructions:
The VD4 Digital circuit-breaker is based on the VD4
version. So much so, most of the information in the
VD4 instruction manual is also applicable to the VD4
Digital circuit-breaker.
Please refer to the instruction manual of the VD4
circuit-breaker (code 647654) for specific
information.
Additional information concerning the VD4 Digital
circuit-breaker is given in this supplement.
MEDIUM VOLTAGE SERVICES 3

Combined current-voltage sensors
The current is measured by a Rogowski coil: a
uniform winding on a closed circular support with a
constant crosssection and without a ferromagnetic
core. The voltage induced in the winding is directly
proportional to the variation in the let-through
current.
The current sensors are characterized by the
absence of saturation and hysteresis phenomena
and by their accurate measurement for fault
currents up to the maximum adjustable setting
value of the protection thresholds.
The voltage is measured by a capacitive divider: a
cylindrical metal electrode moulded in the sensor
and facing the circuitbreaker bushing. The output
signal is a voltage directly proportional to the
primary voltage.
The voltage sensors are characterized by the
absence of ferroresonance phenomena.
General
VD4 Digital circuit breaker with embedded sensors
and a new relay, for instance type REF 615, has been
designed to provide a powerful electrical plant
protection system.
VD4 Digital circuit-breaker uses current sensors or
combined current and voltage sensors
(combisensors) able to measure the current and
voltage applied to each pole.
The VD4 Digital circuit-breaker is available in
withdrawable version for UniGear ZS1 switchgear,
PowerCube units, and OneFit. It can be used in fixed
version for the design and supply of roll-in-retrofit
solutions to MV circuit breaker installed base, in
particular when original circuit breaker had current
or voltage instrument transformers or direct acting
relay mounted on withdrawable truck.
VD4 Digital is mechanically interchangeable with the
VD4 series circuit-breaker.
Combined current-voltage sensors.
—
3. Description
4VD4 DIGITAL ADDENDUM - TO VD4 INSTALLATION AND SERVICE INSTRUCTIONS

VD4 Digital socket Kit - fixed
version
The VD4 digital socket wiring kit for fixed version is
based on standard 58 pin socket and Sensor cables
with RJ45 type terminal connector to bring sensors
signal to a ABB relay mounted on Roll-in-retrofit
truck. In this case the sensor signal does not go
through the 58pin plug/socket but direct to the
relay.
Additional reference Standards
Voltage sensors: IEC 60044-7 (1999-12)
Instrument transformers –
Part 7: Electronic voltage transformers
Current sensors: IEC 60044-8 (2002-07)
Instrument transformers –
Part 8: Electronic current transformers
Structure
Fixed circuit-breaker
Withdrawable circuit-breaker
1
2
13
1
Withdrawable circuit-breaker
Fixed circuit-breaker
VD4 Digital socket Kit -
withdrawable version
The VD4 socket wiring kit allows simple and rapid
construction of the panel wiring part. It consists of:
• 58 pin socket (1);
• Cables 1.5 metres long with 2.5 mm² cross section
copper cables for the power connections and with
1 mm² cross section for the signal connections (2);
• Sensor cables with RJ45 type terminal connector
(3).
MEDIUM VOLTAGE SERVICES 5

6VD4 DIGITAL ADDENDUM - TO VD4 INSTALLATION AND SERVICE INSTRUCTIONS
VD4 Digital fixed circuit-breaker without lower and upper terminals (12 kV and 17.5 kV)
Select rating and size, specifing if current sensors only or combined current and voltage sensors are required
Ur Isc Rated thermal current (40 °C) A (1)
Circuit-breaker type Overall
dimensions
kV kA K1 K2 K3
12
17.5
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
   
   
   
   
   
   
   
   

   
   
   
—
4. Selection and ordering
K1-K2-K3 sensor sizes
(1) Rated thermal current
(40 °C): 630A-1000A
(instead of 1250A) –
1600A-1800A (instead of
2000A) – 2300A (instead
of 2500A), with
combisensors.

MEDIUM VOLTAGE SERVICES 7
VD4 Digital/P withdrawable circuit-breakers (12 kV and 17.5 kV)
Select rating and size, specifing if current sensors only or combined current and voltage sensors are required
ø = diameter of isolating
contacts
(1) Rated thermal current
(40 °C): 630A-1000A
(instead of 1250A) –
1600A-1800A (instead of
2000A) –
2300A (instead of 2500A),
with combisensors.
(2) Versions Ø79 p275 are
not available for
PowerCube units.
Versions p210 and p275
are not available for
OneFit.
Circuit-breaker trucks
p210-p275 have a
drawable stroke of
150mm.
Ur Isc Rated thermal current (40 °C) [A] (1)
Circuit-breaker type (2) Overall
dimensions
kV kA    
12
17.5
   

   
   
   
   
   
   
   
   


   
   
   
   
   

   
   
   
   


   
   
   
   
   

   
   
   
   

   
   
   

8VD4 DIGITAL ADDENDUM - TO VD4 INSTALLATION AND SERVICE INSTRUCTIONS
—
5. Specific characteristics of the product
Current and voltage sensors
Two types of sensor can be used in VD4 Digital
circuit-breakers:
• Rogowski coil: for current measurement only.
• Combisensors: allow both current and voltage
measurements. Along with the Rogowski coil, they
have an integrated capacitive divider for
measuring the voltage applied during each phase.
This new generation of sensors is small, provides a
better performance than conventional current and
voltage transformers and possess a higher degree
of standardization.
Uout
Up
u
out
= M di
p
dt
Schematic diagram of the Rogowski coil (current sensor).
Combined current voltage sensor applied to the circuit-breaker poles.
The Rogowski coil
This consists of a uniform winding over a closed
circular support with a constant section and
without a ferromagnetic core.
The voltage generated in the winding is directly
proportional to the derivative of the let-through
current.
There are many advantages in using the Rogowski
coil, amongst which are:
• absolute linearity of the outgoing signal
• no saturation
• no currents able to magnetize the metal core. This
is very important at low current values for current
transformers
• no hysteresis phenomena.
During the design stage of the VD4 Digital circuit-
breaker, the characteristics described above made it
possible to adopt the solution with only three
sensor sizes, which can cover all rated current values
from 50 to 2500 A and guarantee protection against
short-circuits up to 40 kA.

Rogowski current sensors is constant and does not
depend on the primary current value. This means
that the error can be eliminated with an appropriate
characteristic correction factor of the sensor.
Conventional current transformers have an error
that depends on the primary current, so the error is
not constant and cannot be corrected. Moreover, it
takes on considerable values at the ends of the
primary current field.

MEDIUM VOLTAGE SERVICES 9
Ip(log)
Precision limit
Current
sensor
Rated
current
Current
transformer
Extent of the “ε
1000
100
10
1
0,1
0,01
0,01 10,1 100010010
Response characteristic of the Rogowski coil compared to that of a current transformer.
secondary current
primary current
Current sensors
without
ferromagnetic core
Current transformers
with
ferromagnetic core
Saturation

10 VD4 DIGITAL ADDENDUM - TO VD4 INSTALLATION AND SERVICE INSTRUCTIONS
Types and characteristics of the sensors used in the
VD4 Digital circuit-breaker
VD4 Digital circuit-breakers, which do not include
voltage measurement, use KEVCR AC1, KEVCR BC1
and KEVCR CC1 current sensors with rated currents
of 1250, 2000 and 2500A respectively. KEVCR AA1,
KEVCR BA1 and KEVCR CA1 type sensors are used
for the VD4 Digital with voltage measurement, with
rated currents of 1000, 1800 and 2300A respectively.
Sensor voltage accuracy voltage data current accuracy current data Rated currents
K1
COMBISENSOR        
CURRENT SENSOR  –––    
K2
COMBISENSOR        
CURRENT SENSOR  –––    
K3
COMBISENSOR        
CURRENT SENSOR  –––    
The capacitive divider
The capacitive element consists of a cylindrical
metal surface facing the circuit-breaker bushing.
The output signal is a voltage directly proportional
to the primary voltage.
The voltage sensors are characterized by the
absence of ferroresonance. Just a single capacitive
divider covers the operating voltage range through
to the rated voltage of the circuit-breaker.
uout = up
C1
C1 + C2
Uout
Up
Schematic diagram of the capacitive divider (voltage sensor).
—
5. Specific characteristics of the product