Module 10B:

Transformer Protection
The year of Profitable Growth

Global network of innovation

Power Transmission and Distribution

Commissioning and operating aids (4 of 5)

Power Automation
Progress. Its that simple.

Generator
transformer
SITRAM+
Siemens
Transformer
Monitoring
System for
all voltage
levels

Shunt
reactor

HVDC

System
interconnecting
transformer

FACTS
Converter
transformer

Furnace
transformer

System
transformer

Oil-immersed
distribution transformer

Voltage
regulator

GEAFOL
cast-resin transformer

TLM50+
Siemens
Transformer
Life
Management
Program

Traction
transformer

Power Automation

Power Transmission and Distribution

575-MVA Phase Angle Regulator (PAR)

Transformer Set in the 345 kV Station
Power Automation
Progress. Its that simple.

Power Automation

Power Transmission and Distribution

630-kVA Oil-Immersed Distribution

Transformers, TUMETIC, TUNORMA
Power Automation
Progress. Its that simple.

Power Automation

Power Transmission and Distribution

Transformer Prices
Power Automation
Progress. Its that simple.

>40 MVA
10,-US$ pro kVA =>
30MVA = 40.000 kVA *10 US$ = 300.000US$
>200 MVA
8,-US $ pro kVA =>
200 MVA 200.000kVA *8 US$ = 1600.000US$

>1000 MVA
5,-US$ pro kVA =>
1000 MVA 1000.000kVA *5 = 5000.000 US$
Power Automation

Power Transmission and Distribution

TLM50+ Siemens Transformer Life Management

Program
Power Automation
Progress. Its that simple.

SIDRY, SMART DRY,

SIREC advanced life
extension programs

SITRAD Condition
assessment program

Traditional heat and

vacuum treatment

On-site services
and repair
SITRAM+ transformer
monitoring system
Power Automation

Power Transmission and Distribution

Transformer Faults
Power Automation
Progress. Its that simple.

Power Automation

Power Transmission and Distribution

The 7UT6 Family

Power Automation
Progress. Its that simple.

SIPROTEC 4
7UT6 differential protection relay for transformers,
generators, motors and busbars

7UT612:
7UT613:
7UT633:
7UT635:

for two end protection objects

for three end protection objects
for three end protection objects
for five end protection objects

(1/3 x 19 housing 7XP20)

(1/2 x 19 housing 7XP20)
(1/1 x 19 housing 7XP20)
(1/1 x 19 housing 7XP20)
Power Automation

Power Transmission and Distribution

Hardware options
Power Automation
Progress. Its that simple.

Device

7UT612

7UT613

7UT633

7UT635

Current Inputs (normal)

Current Inputs (sensitive)
Voltage Inputs (Uph / UE)
Binary Inputs
Binary Outputs
Life contact
LC Display

7 (7)*
1
--3
4
1
4 lines

11 (6)*
1**
3/1
5
8
1
4 lines

11 (6)*
1**
3/1
21
24
1
Graphic

14 (12)*
2**
--29
24
1
Graphic

1A, 5A, (1A, 5A, 0.1A) changeable (jumper position)

** changeable normal or sensitive (jumper position)

Power Automation

Power Transmission and Distribution

Scope of functions and Protection objects

Power Automation
Progress. Its that simple.

Function

ANSI No.

Protection Objects

Differential

87T/G/M/L

Three-phase transformer

Restricted Earth fault

87 N

Single-phase transformer

Overcurrent-time, phases

50/51

Auto-transformer

Overcurrent-time, 3I0

50N/51N

Generator / Motor

Overcurrent-time, earth

50G/51G

Busbar, 3-phase (Branch point)

Overcurrent-time, single phase

Busbar, 1-phase

Negative sequence

46

Overload IEC 60255-8

49

Overload IEC 60354 (hot spot)

49

Overexcitation V/Hz

24

Breaker failure

50BF

External temperature monitoring

38

Lockout

86

Measured value supervision

Trip circuit supervision

74TC

Direct coupling
Operational measured values

Power Automation

10

Power Transmission and Distribution

Cross reference - functions and protected objects

Power Automation

Protection functions

ANSI No.

Transf.
3-phase

Transf.
1-phase

Autotransf.

Gen. /
Motor

Busbar
3-phase

Busbar
1-phase

Differential

87T/G/M/L

Restricted Earth Fault

87 N

---

---

---

Overcurrent-time, phases

50/51

---

Overcurrent-time, 3I0

50N/51N

---

---

Overcurrent-time, earth

50G/51G

Progress. Its that simple.

Overcurrent-time, single phase

Negative sequence

46

---

---

Overload IEC 60255-8

49

---

Overload IEC 60354

49

---

24

Breaker failure

50 BF

---

External temperature monitoring

(thermo-box)

38

Lockout

86

Direct coupling 1

Direct coupling 2

Operational measured values

Overexcitation V/Hz

*)

Measured value supervision

Trip circuit supervision

X Function applicable ;

74TC

--- Function not applicable ;

*) only 7UT613 / 633

Power Automation

11

Power Transmission and Distribution

Communication features
Power Automation

Flexibility due to plug in modules

Progress. Its that simple.

Compatibility to international standards

RS232/RS485 electrical module

Front interface
DIGSI4

WEB Monitor

Service interface (s)

Fibre-optic module

Optical double-ring module

DIGSI4 operation
modem connection
RTD box

System interface
IEC60870-5-103
Profibus FMS
Profibus DP
DNP3.0
Modbus ASCII/RTU

Time synchronising
IRIG-B (GPS)
DCF77

Power Automation

12

Power Transmission and Distribution

Connection Example
M3
L1

Power Automation
Progress. Its that simple.

side 3

L2

direct connection to the

main Cts

L3

L1

M2

side 2

side 1

M1
L1

L2

L2

L3

L3

no matching transformers /
no matching connections
numerical vector group
adaptation without zero
sequence current correction
depending of the type of
earthing of the winding.
increased sensitivity by 33%
by measuring of the zero
sequence current (7UT6) for
single-pole faults.

IL1M2

IX1

IX3

IL1M1

IL2M2

IL2M1

IL3M2

IL3M1

1A/5A main Cts adaptation

in the relay

permissible ratio Ct nominal

current to transformer nominal
current up to 1 : 4

IL1M3

Surface
mounting
housing

IL2M3

Flush/
cubiclemounting
housing

IL3M3

7UT613
Power Automation

13

Power Transmission and Distribution

Application: 3-winding transformer YNd5d11 (1 of 4)

Power Automation

IL1M1/I1

Progress. Its that simple.

M1

IL2M1/I2

M2
400/1A
M1
400/1A

IL3M1/I3
IL1M2/I4

M3 400/1A
M2

IL2M2/I5
IL3M2/I6
IL1M3/I7

M3

IL2M3/I8
IL3M3/I9

M5
3500/1A

Side 1
200/1A

IL1M4/I10
M4

IL2M4/I11

IL3M4/I12

Side 3

Side 2

IL1M5/Ix1

M5

IL2M5/Ix2

M4
8000/1A

IL3M5/Ix3
Ix4

7UT635
Power Automation

14

Power Transmission and Distribution

Application: 3-winding transformer YNd5d11 (2 of 4)

-Device Configuration and Power System Data 1
Power Automation
Progress. Its that simple.

7UT635

Power Automation

15

Power Transmission and Distribution

Application: 3-winding transformer YNd5d11 (3 of 4)

-continue Power System Data 1
Power Automation
Progress. Its that simple.

7UT635

Power Automation

16

Power Transmission and Distribution

Application: 3-winding transformer YNd5d11 (4 of 4)

-continue Power System Data 1
Power Automation
Progress. Its that simple.

7UT635

Power Automation

17

Power Transmission and Distribution

Application: Autotransformer with Winding (1 of 2)

Power Automation
Progress. Its that simple.

M1

Side 1

M2

Side 3

M3

Side 2

IL1M2

IL1M3

IL2M2

IL2M3

IL3M2

IL3M3

IL1M1

IL2M1

IL3M1

7UT613
Power Automation

18

Power Transmission and Distribution

Application: Autotransformer with Winding (2 of 2)

- Power System Data 1
Power Automation
Progress. Its that simple.

7UT613

Power Automation

19

Power Transmission and Distribution

Application: Autotransformer with Winding (2 of 2)

- Power System Data 1
Power Automation
Progress. Its that simple.

Power Automation

20

Power Transmission and Distribution

Application: Autotransformer (bank) with

3 Cts at the star point side available
Power Automation
Progress. Its that simple.

(1 of 2)

M3

M1

Only compensation winding,

no external connection!

M2

Increased sensitivity for

phase to phase- and
phase to ground faults
towards the star point!

7UT613
Power Automation

21

Power Transmission and Distribution

Application: Autotransformer (bank) with

3 Cts at the neutral side

(2 of 2)

Power Automation
Progress. Its that simple.

7UT613

Power Automation

22

Power Transmission and Distribution

Application: Single-phase bus bar

(1/2)
- Phase selective configuration (1 7UT6 for 1 phase)
Power Automation
Progress. Its that simple.

7UT612:
7 currentinputs
7UT613/633:
9 currentinputs
7UT635:
12 currentinputs

7UT612

Power Automation

23

Power Transmission and Distribution

Application: Single-phase bus bar

(2/2)
- Phase selective configuration (1 7UT6 for 1 phase)
Power Automation
Progress. Its that simple.

7UT612

2 more Relays
for Phase 2 and 3
are necessary

Power Automation

24

Power Transmission and Distribution

Application: Single-phase bus bar

- configuration with Summation Cts

(1 of 2)

Power Automation
Progress. Its that simple.

7UT612:
7 currentinputs 0.1A
7UT613/633:
6 currentinputs 0.1A

7UT635:
12 current
inputs 0.1A

*) Summation CT
4AM5120-3DA00-0AN2: 1/0.1A
4AM5120-4DA00-0AN2: 5/0.1A

7UT612

Power Automation

25

Power Transmission and Distribution

Application: Single-phase bus bar

- configuration with Summation Cts

(2 of 2)

Power Automation
Progress. Its that simple.

7UT612

Not important
in this case

Power Automation

26

Power Transmission and Distribution

General Applications
of 2)

(1

Power Automation
Progress. Its that simple.

Two winding transformer

1 or 3 phases

Three winding transformer

1 or 3 phases

1 C.B. application with

two winding transformer

7UT613
7UT633
7UT612
7UM62

Short lines
(2 ends)

7UT613
7UT633

Short lines
(3 ends)

1 C.B. application on
HV and LV side with
two winding transformer

7UT635

7UT612

7UT613
7UT633

Power Automation

27

Power Transmission and Distribution

General Applications
of 2)

(2

Power Automation

Generator/Motor longitudinal or
transversal differential protection

High-impedance
Restricted Earth Fault Protection

G/M
3~

7UT612
7UM62

7UT6xx

Unit Protection
(Overall Differential)

IEE input
of the unit

Progress. Its that simple.

7UT635

G
3~

Power Automation

28

Power Transmission and Distribution

Differential functions IDiff> and IDiff>>

Power Automation

measured value
pre-processing
( vector gr. ,Cts )

Progress. Its that simple.

i1L

Instantaneous
values
iRest = i1 + i2

side 1

i2L

iDiff = i1 + i2

side 2

rectified mean value:

IRest = iRest
fundamental wave:
IDiff = rms(iDiff)50Hz

Tripping characteristic,
saturation detection
IDiff
IDiff>

IRest

&

Trip
IDiff>

Trip
IDiff>>

Motor start
DC off set
analysing of harmonics:
-block by 2. & 3. or 5.har
-cross block
iDiff

iRest IRest

IDiff

IDiff
I / InO

I / InO

IDiff>>

ms

iDiff
2IDiff>>
ms

IDiff> restrained (biased) differential function, IDiff> = f(IRest)

- Ct-saturation detector (add on stabilization) for external faults.
IDiff>> fast unrestrained high current differential function, its setting therefore should be higher then
the maximum possible through flowing current! Example Transformer: IDiff>> > (1/uk)InO
This function will be not blocked by harmonics due to an inrush or Ct-saturation!
The IDiff>> stage evaluates the fundamental wave of the currents as well as the instantaneous values.
- Fundamental wave processing:
fast tripping at the set threshold.
- Instantaneous value processing: ensures fast tripping even in case the fundamental wave
of the current is strongly reduced by Ct-saturation. Because of the possible DC offset after fault
inception, the instantaneous value stage operates only above twice the set threshold.
Power Automation

29

Power Transmission and Distribution

Tripping Characteristic
Reasons for this shape of characteristic
Power Automation
Progress. Its that simple.

I Diff
InO
3.0

2.5
Trip

Slope 2
Total

2.0

Block
1.5

CTerror

1.0

Slope 1

Tapchanger

0.5
IDiff>
0

Magnet.
current
0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

I Rest InO

Example: Transformer with Tap changer

Power Automation

30

Power Transmission and Distribution

Tripping Characteristic
of 2)
Power Automation
Progress. Its that simple.

Tripping Characteristic 7UT6

I Diff
InO
1231 IDiff>>

(1

7
1243A
SLOPE 2

6
45

Block

Trip
4

*)
3
2

Add-on
Stabilization

1241A
SLOPE 1

1
1221 IDiff>

1242A
1256A
BASE POINT 1
I-ADD ON STAB
1244A
BASE POINT 2

10

12

14

16

*) Slope for Add-on Stabilization:

7UT6 Slope 1 ; 7UT5 Slope 1

I Rest
InO

flexible adaptation to various transformers, e.g. with tap changer or different Cts
high stability against external faults with Ct saturation
IDiff>>: fast tripping for solid short-circuits within one period
Power Automation

31

Power Automation

Tripping Characteristic
of 2)
- Parameters

Power Transmission and Distribution

(2

Progress. Its that simple.

7UT6: settable
7UT5: 0 (fixed)
7UT6 only
min. setting:
7UT6: 3 ; 7UT5: 5
7UT613 / 63x

Power Automation

32

Power Transmission and Distribution

Tripping Characteristic
- Pickup of differential function
Power Automation
Progress. Its that simple.

For triggering of internal tasks, events and fault records the differential protection
function needs a pickup information. This pickup becomes active, if the differential
current or the restraint current is over an internal threshold
(dotted line). Each external large current leads to a pickup.
Pickup doesnt always mean internal failure!
Power Automation

33

Power Transmission and Distribution

Tripping Characteristic
- Add on stabilization during external fault
Power Automation
Progress. Its that simple.

During an external fault which

produces a high
through-flowing current,
causing Ct saturation,
a considerable differentialcurrent can be simulated,
especially when the degree of
saturation is different at the
two sides.
If the quantities IDiff/IRest result
in an operating point which
lays in the trip area of the
operating characteristic, a
trip signal would be the
consequence, if there were no
special measures

Tripping Characteristic 7UT6

I Diff
InO
IDiff>>

(1 of 2)

Trip
6
45

Block

5
D
C

4
3

Add-on
Stabilization

1
Saturation inception

IDiff>

0
0
A

10

12

14

16

I Rest
InO

Immediately after fault inception (A) the fault currents increase severely thus producing a high
restraint quantity. At the instant of Ct saturation (B) a differential quantity is produced and the restraint
quantity is reduced. In consequence, the operating point IDiff/IRest may move into the tripping area (C).
In contrast, the operating point moves immediately along the fault characteristic (D) when an internal
fault occurs.

When an external fault is detected, the differential stage for this phase is blocked by an
adjustable no. of periods. (for 7UT613/63x now also cross block is possible)
Power Automation

34

Power Transmission and Distribution

Power Automation

Tripping Characteristic
of 2)
- Demonstration of add-on stabilization

(2

Progress. Its that simple.

Block

45

Trip

add-on
stabilisati
on

Power Automation

35

Power Transmission and Distribution

Tripping Characteristic
- Motor Start
Power Automation
Progress. Its that simple.

Typical for motor start is the starting current and the superimposed dc component with
a large time constant. The two Ct-sets may transform this dc component differently.
The result is a differential current and the risk of an over-function is given.
Detection of motor starting:
Increases the pick-up values for a settable time
Tripping Characteristic 7UT6 for Motor start

I Diff
InO
1231 Idiff>>

Criterion:
Supervision of
restraint current

7
Start-up characteristic
6
5

IRest > I-Restr. Startup

(until 2 I/InO)

than the
Start-Factor (max. 2)
is active for the time:

T Start Max
(Duration of dynamical
increasing of pickup)

Steady-state
characteristic

Trip

45

Increase
of pickup

3
2
Block
1
1221 Idiff>

10

12

14

16

Power Automation

I Rest
InO
36

Power Transmission and Distribution

Tripping Characteristic
DC offset: Increasing of the Characteristic
Power Automation
Progress. Its that simple.
increased
characteristic
(factor 2)

0.24

0.36
Steady state
characteristic

0.12
0.18
Minimum
setting
Add-on
stabilization

Setting Add-on stabilization:

5

7UT613/63x only
Power Automation

37

Power Transmission and Distribution

Inrush, cross block, over excitation [V/Hz]

2)

(1 of

filter window
1 cycle

Power Automation
Progress. Its that simple.
iRUSH
= iDiff

Cross-block = No (phase separate blocking)

Inrush current
in one phase

1P

I 2har
I Diff

2P

IDiff, L1 > trip blocking

L2-block

IDiff, L2 > trip blocking

L3-block

IDiff, L3 > trip blocking

3P t

Cross-block = Yes (blocking of all phases)

block
Setting
value

15 %

L1-block

L1-block
L2-block

OR
1

IDiff > trip blocking

for an adjustable time

L3-block

no block
0

recognise inrush condition by evaluating the ratio 2nd harmonic I2har to basic wave IDiff.

Time limit for cross-block. Reliable reaction to the inrush condition with cross-block.
Trip of a short circuit after the set time delay.
recognise over excitation [V/Hz] by evaluating the ratio 3rd or 5th harmonic to basic wave
Power Automation

38

Power Transmission and Distribution

Inrush, cross block, over excitation [V/Hz]

(2 of 2)
Demo: Inrush followed by an internal Fault L1-E
Power Automation
Progress. Its that simple.

Internal
fault

IDiff>>

Inrush

IDiff>

Add-on
stabilizati
on

3 cycles

Power Automation

39

Power Transmission and Distribution

Low impedance Restricted Earth Fault (REF)

2)

(1 of

Power Automation
Progress. Its that simple.

The REF measures the Neutral current of the object ( ISP = 3I0 ) and, depending on the
angle () between 3I0 and the also measured sum of the phase currents
( 3I0 = IL1 + IL2 + IL3 ), decides for internal or external fault.
The sensitivity of the REF is almost independent from the load of the object.
(The sensitivity of the Differential Function especially for high ohm faults will be
reduced by the load due to the slope of its Tripping Characteristic ).

The REF can be stetted to 0.1 I/INO (min. 0.05) and is therefore more sensitive as the
Differential Protection (even without load).

Power Automation

40

Power Transmission and Distribution

Low impedance Restricted Earth Fault (REF)

Power Automation
Progress. Its that simple.

Tripping Characteristic REF

IREF> = Setting value (Trip Threshold)

IRest = Restraint current
IREF = 3I0

I REF
I REF

Char. for
= 180

1) for basic Trip-Area (0 90):

IREF = 3I0 and must be IREF>

Tripping
3

Characteristic_1):
IREF / IREF> = 1
(no restraining current IRest effective)

2) for extended Trip-Area (90 180):

Blocking

Characteristic_2):
IREF = IREF> + kIRest
where IRest = (3I0-3I0-3I0+3I0)
IRest includes the direction

(2 of 2)

-0.3

-0.2

-0.1

0.0

180 > 90
extended Trip-Area

+0.1

+0.2

+0.3

3I '0' 3I '0

90 0
basic Trip-Area

calculation of the basic wave and the complex vectors of I0' and I0"
evaluation of the modulus and angle between I0' and I0"
sensitive fault detection starting with 5% transformer nominal current
Power Automation

41

Power Transmission and Distribution

CT Requirements
Power Automation
Progress. Its that simple.

(1 of 3)

Request: k ALF

k ALF_N

R ct
R ct

Rb
R 'b

k ALF

k ALF_N

R ct
R ct

Rb
R 'b

IP
I NCtPrim
IP
I NCtPrim

for : TP 100ms
for : TP

where:
kALF_N = rated Accuracy Limiting Factor
Rct = secondary winding resistance
Rb = rated resistive burden
IP = max. primary symmetrical short circuit current
Example: (TP 100ms)

100ms

kALF = actual Accuracy Limiting Factor

Rb = actual resistive burden
TP = Primary (Net-) Time constant

Explanation:
5P20: kALF_N = 20

110 kV
7UT6
200/1A
5P20,15VA
Rct = 1

80m , 2.5 mm2

Wind.1
0.1

38.1 MVA
110/11 kV
uk = 10%
2000/1A
10P10, 10VA
Rct = 2

11 kV

50m , 4 mm2

Wind.2
0.1

Power Automation

42

Power Transmission and Distribution

CT Requirements
of 3)
Power Automation

(2
Side 2 (LV):

Side 1 (HV):

Progress. Its that simple.

Nominal transformer current:

SN
3 U N1

InO1

38100kVA
3 110kV

Nominal transformer current:

Maximum through flowing current:

c InO1
100%
uk

I P_1

R 'b

k ALF

Sb
I

2
NCtS

2 l
q

20

15VA
1A 2

1.1 200A
100%
10%

2200A

15

160m 0.0175
2.5mm

mm 2
m
2

0.1 1.22

1 15
144
1 1.22

k ALF 144

IP
I NCT prim

2200A
200A

c InO 2
100%
uk

I P_2

2000A

R 'b

Sb
I

2
NCtS

2 l
q

k ALF 10
44

OK!

1.1 2000A
100%
10%

22000A

where: c = factor for max. possible over voltage

Rb

R Relay

38100kVA
3 11kV

Maximum through flowing current:

where: c = factor for max. possible over voltage

Rb

SN
3 U N2

InO 2

200A

k ALF

10VA
1A 2

10
100m 0.0175

R Relay

2 10
2 0.54

47.2 4

IP
I NCT prim

mm 2
m

4mm 2

0.1

0.54

47.2
4

22000A
2000A

44

OK!

Power Automation

43

Power Transmission and Distribution

CT Requirements
of 3)
Power Automation
Progress. Its that simple.

(3

5P20, 200/1A, 15VA, Rct = 1, Rb = 1.22, 11I/INCT ; TP = 100ms

10P10, 2000/1A, 10VA, Rct = 2, Rb = 0.54, 11I/INCT ; TP = 100ms

Power Automation

44

Power Transmission and Distribution

Power Automation
Progress. Its that simple.

Commissioning and operating aids

4)
WEB-Technology

(1 of

Access to the relay with a WEB Monitor

Help system in
INTRANET / INTERNET
http://www.siprotec.com

1. Serial connection
Direct or via modem with a
standard DIAL-UP Network

The homepage of the relay

is:http://141.141.255.160
IP-address is set with DIGSI 4
on front- or rear service port

WEB server in the relays

firmware
Server sends its HTML-pages
and JAVA-code to the WEB Monitor
after a DIAL-UP connection

2. HTML page view in a WEB Monitor

with the IP-address of the relay
http://141.141.255.160
Power Automation

45

Power Transmission and Distribution

Commissioning and operating aids

4)

(2 of

Power Automation
Progress. Its that simple.

Transformer YNd11d11, 110/11/11kV, 38.1MVA, IL2S2 wrong polarity

Power Automation

46

Power Transmission and Distribution

Commissioning and operating aids

4)

(3 of

Power Automation
Progress. Its that simple.

Transformer YNd11d11, 110/11/11kV, 38.1MVA, IL2S2 wrong polarity

Power Automation

47

Power Transmission and Distribution

Commissioning and operating aids

4)

(4 of

Power Automation
Progress. Its that simple.

Power Automation

48

Power Transmission and Distribution

Benefits for the Customer

Power Automation
Progress. Its that simple.

Protection relay with flexible adaptation to the transformer/generator/motor

or short line. Programming of the device data in the relay.
Reduced amount of wiring by direct connection to the main Cts.
No matching transformers and therefore no wiring errors.
Zero sequence current can be measured (in the 7UT6).
Sensitivity for single-pole faults in the transformer increased by 33% .

Flexible adaptation of the tripping characteristic to various main Cts,

tapped transformers.
Exact discrimination between the short circuit condition and the inrush
condition by on-line analysis of the harmonics. Fast tripping for
high-current faults. Ct saturation detector for external faults.
Thermal monitoring of one transformer winding (including RTD meas.)

Back-up DMTL/IDMTL with reverse blocking for one winding.

Sensitive short circuit protection for faults winding against earth.
External Trip functions
Various commissioning aids.
Common DIGSI 4 software
Power Automation

49

Power Transmission and Distribution

Comparison of functions/settings
between 7UT51- and 7UT6 relays
7UT51

7UT612

7UT613

7UT633

7UT635

Tripping Characteristic: Base point for slope 1 settable

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Tripping Characteristic: Increasing of characteristic at start

---

Tripping Characteristic: minimum setting for add-on stabilization I/InO

Tripping Characteristic: cross block for add-on stabilization

---

---

Tripping Characteristic: slope of add-on stabilization / slope 1

Tripping Characteristic: Increasing of characteristic due to DC offset in IDiff

---

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Transformer inrush: Default setting for cross block 2. harmonic [cycles]

Transformer inrush: Default setting for 5. harmonic [%]

80

30

30

30

30

Negative sequence current protection

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Over excitation protection [V/Hz]

---

---

---

Overload protection IEC 60354 (hot spot)

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Single phase busbar differential

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High impedance Restricted Earth Fault

---

Voltage measurements

---

---

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Temperature monitoring (via Thermo-box / RS 485)

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All functions can be enabled at the same time

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WEB Toll (commissioning aid)

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Power Automation
Progress. Its that simple.

Power Automation

50