PowerIT Indoor Combi Sensor, KEVCD

12, 17.5 and 24 kV1250 and 3 200 A

Contents

Sensor principles .......................................................... 3

Noticeable differences between sensorsand instrument transformers ..................................... 4

Visible effects of sensor technology ......................... 5

Standards and certificates .......................................... 6

Technical specifications forCombi Sensor type KEVCD ..................................... 7-8

Dimensions and weights ....................................... 9-11

This product has been certified by ABB Group as

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equipped with the integral tools necessary to install, operate,

and maintain it efficiently throughout the product lifecycle.

KEVCD • 3

A new solution for measuring currents and voltages needed for protection and

monitoring in medium voltage power systems, is sensors.

Sensors based on alternative principles have been introduced as successors

to instrument transformers in order to obtain size reduction, performance

improvement, and better standardisation. These principles are far from new, but

not until now, with the introduction of versatile electronic relays, has it been

possible to make use of the advantageous properties of sensors.

Current sensorThe measurement of currents in KEVCD sensors is based on the Rogowski coil

principle. A Rogowski coil is a toroidal coil without an iron core placed around

the primary conductor in the same way as the secondary winding in a current

transformer. However, the output signal from a Rogowski coil is not a current,

but a voltage:

In all cases a signal reproducing the actual

primary current waveform is obtained by

integrating the transmitted signal.

Voltage sensorThe measurement of voltages in KEVCD sensors is

based on the use of a resistive voltage divider.

The output is voltage:

In all cases, the transmitted signal reproduces

the actual primary voltage waveform.

Protection and control IEDs (Intelligent Electronic Devices)The functions of a traditional relay, as well as new additional functions, are

included in a protection and control IED.

The information transmitted from the sensors to the IED is, during fault

conditions, more accurate than the corresponding secondary information from

an instrument transformer, hence giving the possibility for a versatile relay

function. However, the IED must be able to operate at a sensor’s low signal

level with sufficient accuracy, and the signal from the Rogowski coil must be

integrated. The lack of such relays has until now limited the use of sensors to

certain special applications. Now modern IEDs (e.g. ABB’s Feeder terminals

in the RE-series) are designed for sensor use, and they are also equipped

with built-in integrators for Rogowski coil sensor inputs.

dt

diMu p

out =

pout uRR

Ru

21

2

+=

Current sensor

Voltage sensor

Sensor principles

From a practical view of thinking, there are two noticeable differences between

sensors and traditional instrument transformers:

LinearityThe sensors are linear up to the highest currents and voltages. On a practical

level, two remarkable advantages are achieved:

1. Measurement and protection can be realised with one

single secondary winding with double ratings.

2. One single standard sensor can be used for a range

of switchgear rating currents or voltages.

CompactnessAs sensing elements are noticeably small and the same elements are used

for both measurement and protection, current and voltage sensors can easily

be combined in one device, a Combi Sensor, still smaller than a conventional

current transformer. The KEVCD sensor is basically a Combi Sensor, even if

it can be delivered without a voltage-sensing element.

4 • KEVCD

Noticeable differences between sensors and instrument transformers

Ratedcurrent

Ip (log)

ε

Currenttransformer

Accuracy limits

Currentsensor

KEVCD • 5

Visible effects of sensor technology

ε

Ip (log)

Accuracy limits Typical accuracy

Rated current range

80 A 1250 A0.05x80 A= 4 A

1.2x1250 A= 1500 A

+3 %

+1 %

-3 %

-1 %

Example:Rated current range: 80-1250 A accuracy class 1The accuracy limits are according to the figure.

Rated rangeBecause voltage and current sensors are highly linear within a very wide range of

voltages and currents respectively, one and the same

sensor can be used for various rated voltages and

currents of switchgear. Instead of one rated current, a

rated current range is defined for the sensor. For every

rated normal current of switchgear within the rated

current range of sensor, the sensor fulfils the accuracy

specification given by the standard for this particular

rated current. To achieve a correct function of the

protection and control IED the selected rated current

as well as the rated transformation ratio must be

programmed to the IED.

The same is valid for the rated voltage range for

voltage sensors.

Correction factorThe amplitude error of a current sensor is in practice constant and independent of

the primary current. Hence, it can be corrected in the IED by using a correction factor,

measured separately for every sensor. A sensor fulfilling the requirements of e.g. class 3

without the correction factor can be corrected to fulfil the requirements of class 1

with the use of the correction factor. For voltage sensors, correction factors are

not used.

AdapterIf the transmitted signal from the current sensor is too high to be correctly processed

by the IED, an adapter shall be inserted between the sensor cable and the IED input,

giving a higher transformation ratio. Such adapters must be matched to the actual IED

used, and shall be separately ordered.

CableThe cable has a considerable influence on the accuracy of the sensor. Therefore,

every sensor is accuracy tested when equipped with its own cable with a length

specified according to the order. Even if the cable can be disconnected for transport

and mounting, the accuracy class specified is valid only when the sensor is equipped

with its original cable having the same serial number as the sensor itself. The cable

is available in three standard lengths, and the length must be specified in the order.

6 • KEVCD

StandardsKEVCD-sensors are designed, manufactured and tested according to the

latest international standards in the field, when they are applicable.

Dimensions: DIN 42600, Teil 8 (Narrow design)

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: Electrical current transformers

Combi Sensors: IEC 60044-3 (1980-01)

Instrument transformers –

Part 3: Combined transformers

CertificatesThe sensor manufacturing complies with the requirements of

the following standards:

Quality system .......................................... ISO 9001

Environmental management system ...... ISO 14001

Standards and certificates

KEVCD • 7

Technical specifications for Combi Sensors type KEVCD

Description• Support type Combi Sensor including

– Rogowski coil current sensor ........................................... all versions

– resistive divider type voltage sensor ................................. versions “AE” and “BE”

– coupling electrode for voltage detecting systems (VDS)

or voltage presence indicating systems (VPIS) ................. all versions

– integrated cable

Rated primary currents1600–3200 A

KEVCD 12

KEVCD 12

KEVCD 17.5

KEVCD 24

Rated primary currents80–1250 A

KEVCD 12

KEVCD 12

KEVCD 17.5

KEVCD 24

Remarks

Insulation levelacc. to Chinese standards

Available types

Functions includedType

KEVCD __AE_, -BE_

KEVCD __AG_, -BG_

Versions

Voltage sensor Current sensor Coupling electrodefor VDS and VPIS

Type

KEVCD 12_

KEVCD 12_C

KEVCD 17.5_

KEVCD 24_

Highest voltage for equipment and test voltages

Highest voltagefor equipmentUm/kV

12

12

17.5

24

Powerfrequency testkV

28

42

38

50

Impulse test

kV

75

75

95

125

Dimension and primary terminal arrangement• The dimensions and primary terminal arrangements are according to

standard DIN 42600, Teil 8 (Narrow design)

On request reversed polarity on primary side

AE3AG3

AE3CAG3C

AE3AG3

AE3AG3

BE2BG2

BE2CBG2C

BE2BG2

BE2BG2

8 • KEVCD

Voltage sensor, rated values• Rated voltage factor, k

u: 1.9 / 8h

• DC withstand voltage: 70 kV 30 min

• Rated frequency, fn: 50/60 Hz

• Rated accuracy: cl. 1/3P

• Rated burden: 4–10 MΩ• Rated primary voltage range and rated transformation ratio:

Type

KEVCD 12_E_

KEVCD 17.5_E_

KEVCD 24_E_

Rated primaryvoltage rangeUpn/kV

6:√3-11:√3

6:√3-15:√3

6:√3-22:√3

Ratedtransformation ratioKn

10 000:1

10 000:1

10 000:1

Current sensors, rated values• Rated frequency, f

r: 50/60 Hz

• Rated accuracy: cl 1(3) (with/without a correction factor)

• Rated burden: 4–10 MΩ• Rated continuous thermal current, short-time thermal current and dynamic current:

Type

KEVCD 12 A_

KEVCD 17.5 A_

KEVCD 24 A_

KEVCD 12 B_

KEVCD 17.5 B_

KEVCD 24 B_

Rated continuousthermal currentIcth/A

1250

1250

1250

3200

3200

3200

Rated short-timethermal currentIth/kA, 3 s

40

40

31.5

40

40

40

Rated dynamiccurrentIdyn/kA

100

100

80

100

100

100

Type

KEVCD 12 A_

KEVCD 17.5 A_

KEVCD 24 A_

KEVCD 12 B_

KEVCD 17.5 B_

KEVCD 24 B_

Rated primarycurrent rangeIpr/A

80–1250

80–1250

80–1250

1600–3200

1600–3200

1600–3200

Ratedtransformation ratioK

n

80 A/0.150 V at 50 Hz

80 A/0.180 V at 60 Hz

1600 A/0.150 V at 50 Hz

1600 A/0.180 V at 60 Hz

• Rated primary current range and rated transformation ratio:

KEVCD • 9

Adapters for protection and control IEDs• For Protection and control IED-units from ABB the adapters shall be selected as

follows, note that both rated current of switchgear and linearity limit shall be

considered:

IED types: REX , REF 54_, REM_

Sensor to be used

Type

KEVCD _ A_KEVCD _ A_KEVCD _ A_

KEVCD _ B_

Adapter to beused

Type

No adapter needed1VFK118009R21VFK118010R2

No adapter needed

Linearity limit forcombination(max rms-value)

4 000 A 12 000 A 32 000 A

>40 000 A

Rated normalcurrent ofswitchgearIr/A

80–160160–480480–1250

1600–3200

Resulting transformation ratio at 50 Hz (60 Hz)

Kra

80 A/0.150 V (0.180V)240 A/0.150 V (0.180V)640 A/0.150 V (0.180V)

1600 A/0.150 V (0.180 V)

Cable• Standard cable lengths: 5.0, 6.5 and 7.5 m

• Cable connector type: Twin BNC

Radiall on request for old REF 542

Coupling electrode for voltage detecting systems• Intended to be used in:

– voltage detecting systems (VDS)

according to IEC 61243-5

– voltage presence indicating systems (VPIS)

according to IEC 61958

• If the coupling electrode is not connected to a coupling system it must be earthed.

• Capacitance values:

C1 = 23–40 pF

C2 ≤ 25 pF

Ordering dataOrdering

• Type

• Cable length

• Adapter (if needed)

• Special execution (on request):

– tropical execution

– reversed polarity on primary side

– cable connector type Radiall

Dimensions and weights

Type

KEVCD 12 A_3 and A_3C

KEVCD 17.5 A_3

KEVCD 24 A_3

KEVCD 12 B_2 and B_2C

KEVCD 17.5 B_2

KEVCD 24 B_2

Weight

kg

12

12

16

23

23

26

Dimension drawing

no.

135 KEVCD 21

135 KEVCD 21

135 KEVCD 22

135 KEVCD 17

135 KEVCD 17

135 KEVCD 15

10 • KEVCD

Dimension drawing 135 KEVCD 21

Dimension drawing 135 KEVCD 22

KEVCD • 11

Dimension drawing 135 KEVCD 17

Dimension drawing 135 KEVCD 15

ABB OyMedium Voltage TechnologyP.O.Box 613, FIN-65101 Vaasa, FinlandPhone +358 10 22 11Fax +358 10 22 44661www.abb.com K

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