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Generator Protection

Siemens LSA 2.5.6 . April 1995 1

Application

The tripping matrix 7UW50 is a compo-nent of the Siemens numerical generatorprotection system. The tripping matrixprovides a transparent, easily program-mable facility for combining output com-mands of the trip outputs of individualprotection devices with plant items suchas the circuit–breaker, overspeed trip etc.The matrix was developed for marshal-ling tripping commands of large powerstation blocks. With its help the trippingschematic can be temporarily changede.g. on the basis of a generator circuit–breaker revision. If the software matrixincorporated in each generator protectionunit is used for marshalling the trippingcommands, the marshalling in the protec-tion unit must be changed for this pur-pose.

Design and construction

The tripping matrix comprises a crossbardistribution with 28 inputs (columns) and10 outputs (rows) which are divided intotwo groups with 14 inputs each. Bothgroups are arranged one over the otherand electrically connected internally. Thecolumns and rows are connected viadiode plugs. To prevent contact withdangerous voltages a slotted plexiglasspanel is mounted to the front of the unit.Diode plugs are plugged into the crossbarthrough the slots of the panel. Anadditional plexiglas panel preventsunauthorized operation. This panel can besealed.An LED is assigned to each input(column) and each output (row). Allsignals are stored and can therefore stillbe displayed after reset of the command.The LEDs and memories are supplied viaan internal converter.The matrix 7UW50 is incorporated in ahousing 7XP20. The housing is availablefor panel surface mounting and cubicle orpanel flush mounting and correspondswith the housings for the generatorprotection series 7UM51.

Operation

Connection between input and output sig-nals is implemented via diode plugs. Theplugs are plugged into the front panel ofthe matrix.A reset button is used for resetting allmemories and for testing the LEDs. Thememories (LEDs) can also be remotelyreset via a binary input.

Tripping concept for numerical protec-tion

The 7UM51 numerical generator protec-tion units incorporate an integrated soft-ware matrix. Since each protection unithas 5 tripping relays, the integratedmatrix has 5 outputs. This number isgenerally sufficient for smaller generatorsof up to 50 MVA capacity. If severalmultifunction units are used for theprotection of a small generator, the tripcontacts of the individual relays must beconnected in parallel (see Fig. 2).If more than 5 tripping channels are re-quired, master relays can be added to thetrip relays integrated in the protectionunits. The master relays then take overthe task of decoupling the signals, multi-plying the contacts of the integrated triprelays and realising the tripping combina-tions via the assignation of trip signals(circuit–breakers, de–excitation switches,...) to form trip commands from protec-tion functions (see Fig. 3). This solution ispossible if no more tripping combinations(master relays) are to be activated from anumerical protecion unit than trip relaysexist in the devices (5 for the series7UM51).

If a variable arrangement of the trippingcombinations is required for large genera-tor units with more than 5 trippingchannels, the hardware matrix describedhere can be used. With this variant it isalso important to note that a maximum of5 trip signals can be extracted from theprotection units. If the integrated soft-ware matrix is used to combine severaltrip signals, more than 5 trippingcommands from the protection functionsimplemented in the device can be com-pressed into 5 signals. The combined sig-nals in each case then activate the samematrix column and therefore the sametripping combination. When changing thediode combination the tripping combina-tions of all the protection functions allo-cated to this matrix column are affected.(See also Fig. 4 and Fig. 5). Each matrixrow activates trip relays.

7UW50 tripping matrix

Siemens AG 1995�

Fig. 17UW50 tripping matrix


Siemens LSA 2.5.6 . April 19952


Fig. 2Tripping concept with software matrix

+ + + + +

– – – – –

S1 S2 S3 S4 S5

7UM51

Protection unit 1

7UM51

Protection unit k

1 2 3 4 5 6 n

K1

K2

K3

K4

K5

K1

K2

K3

K4

K5

Software matrix

Trip signals from theprotection functions

Software matrix


1 2 3 4 5 6 n..

. .




Fig. 3Tripping concept with master relay

M1

M2

M3

M4

M5

– – – – – –

+ + + + + +

+

–

S1 S2 S3 S4 S5 Sn

7UM51

Protection unit 1

7UM51

Protection unit k

1 2 3 4 5 6 n

K1

K2

K3

K4

K5

K1

K2

K3

K4

K5

Software matrix


Software matrix

Trip signals from theprotection units

1 2 3 4 5 6 n..

. .




Fig. 4Tripping concept with hardware matrix

7UM51

Protection unit 1

7UM51

Protection unit k

1 2 3 4 5 6 n

K1

K2

K3

K4

K5

K1

K2

K3

K4

K5

Software matrix


Software matrix

Trip signals from the protection functions

1 2 3 4 5 6 n..

. .

S1 S2 S3 S4 S10

H1 H2 H3 H4 H10

–+ + + + +– – – – –

+

12345

2425262728

Matrix 7UW50 28x10

=




Fig. 5Tripping concept with hardware matrix and software matrix

7UM51

Protection unit 1

7UM51

Protection unit k

1 2 3 4 5 6 n

K1

K2

K3

K4

K5

K1

K2

K3

K4

K5

Software matrix


Software matrix


1 2 3 4 5 6 n..

. .

S1 S2 S3 S4 S10

H1 H2 H3 H4 H10

–+ + + + +– – – – –

+

12345

2425262728

Matrix 7UW50 28x10

=



Technical data

Matrix Number of columns (inputs)Number of rows (outputs)

2810

Voltage supply Rated auxiliary voltage Vaux

Permissible tolerance of rated auxiliary voltagePower consumption quiescent

energizedBridging period on auxiliary voltage failure

60, 110, 125 V DC220, 250 V DC–20 to +15 %approx. 2.5 Wapprox. 10 W� 50 ms with Vaux � 110 V

Diode plugs Maximum permissible currentPlug pin diameterBlocking voltageCurrent flow direction

1 A2.4 mm1000 Vfrom column (+) to row (–)

Scope of deliveryCentral contact breaker pin (red)Diode plug (black)

28130

Alarm contacts 1 alarm relay for ”tripping command dispatched” indicationContact setSwitching capacity make

breakSwitching voltagePermissible current

1 alarm relay for ”power supply failure” indicationContact setSwitching capacity make/breakSwitching voltagePermissible current

2 NO contacts1000 W/VA30 W/VA250 V AC/DC30 A for 0.5 s

1 NC contact (closed on fault)20 W/VA250 V AC/DC1 A continuous

Binary inputs 1 binary input for LED remote resetVoltage range 1Voltage range 2

Both voltage ranges are fed to the connection block

24 to 60 V110 to 250 V

Construction For panel surface mountingWeight

For panel flush mounting/cubicle mountingWeight

Degree of protection to EN 60529HousingTerminals

in housing 7XP2040–1approx. 7.5 kgin housing 7XP2040–2approx. 6 kg

IP51IP21

Selection and ordering data

Order No.7UW50 tripping matrix 7UW5000 – � � A 0 0

Rated auxiliary voltage60, 110, 125 V DC220, 250 V DC

45

Mechanical constructionfor panel surface mountingfor panel flush mounting or cubicle mounting

BC





Fig. 6Connection diagram for the 7UW50 tripping matrix

==

Column 1Column 2Column 3Column 4Column 5Column 6Column 7Column 8Column 9Column 10Column 11Column 12Column 13Column 14Column 15Column 16Column 17Column 18Column 19Column 20Column 21Column 22Column 23Column 24Column 25Column 26Column 27Column 28

–K1

–K7

Powersupply

61

62

63

64

65

66

67

68

69

70

747599100

1817

8B1

8B2

8B3

8B4

7B1

7B2

7B3

7B4

6B1

6B2

5B15B25B35B4

6A16A2

54

53

55

1516

26

2930

28

31323334353637383940414243444546474849502524232221

8A1

8A2

8A4

4B14B2

1A41A31A21A11B41B31B21B12A42A32A22A12B42B32B22B13A43A33A23A13B43B33B23B14A44A3

4A14A2

E1: LED Reset

60..110..125V

220..250V

Vaux L+Vaux L–

Alarm relay

Device ready

Row A

Row B

Row C

Row D

Row E

Row F

Row G

Row H

Row J

Row K

Version for panel flush mounting/cubicle mounting

8B1

Version for panel surface mountingTripping matrix 7UW50



Dimension drawings in mm

Fig. 77UW50 with housing 7XP2040–2 (for panel flush mounting or cubicle mounting)

Front view Side view Panel cutout

206.5180

221

7.313.2

255.

8

245

266

231.5

30 29.5

1.5

5.4

225

220

244

172

Diam. 5 or M4

Diam. 6

Fig. 87UW50 with housing 7XP2040–1 (for panel surface mounting)

Front view Side view

260

27 29.526

6

71

280

344

234

219

126

1.539

40

Cutout 20 x 60(without paint)

10051 75

5025

76

7.5

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Conditions of Sale and Delivery

Subject to theGeneral Conditions of Supply and Deliveryfor Products and Services of theElectrical and Electronic Industryand to any other conditions agreed uponwith the recipients of catalogs.

�

The technical data, dimensions and weights are subject to change unlessotherwise stated on the individual pagesof this catalog.

The illustrations are for reference only.

We reserve the right to adjust the pricesand shall charge the price applying onthe date of delivery.

Export Regulations

In accordance with present German andUS export regulations export licences (da-ted 03.95) are not required for the prod-ucts listed in this catalog.Export and re–export are therefore

permissible without the approval of therelevant authorities except where currentGerman export regulations contain coun-try–specific restrictions.

Subject to change.Relevant are the criteria stated in the delivery note and in the invoice.An export licence may be required due to country–specific application of theproduct.

Trademarks

All product designations used are trade-marks or product names of Siemens AGor of suppliers.

Dimensions

All dimensions in this catalog are given inmm

Responsible for

Technical contents: Norbert Schuster,Siemens AG, EV S T11, Nürnberg

General editing: Claudia Kühn–Sutiono,Siemens AG, EV MK 2, Erlangen

Conditions of Sale and Delivery � Export Regulations � Trademarks � Dimensions

A 9.91 a


Siemens LSA 2.5.6 . April 199510Siemens Aktiengesellschaft

BereichEnergieübertragung und -verteilungGeschäftsgebietZähler, Sekundär- und NetzleittechnikP. O. Box 48 06D-90026 Nürnberg

Order No.: E50001-K5752–A161-A1–7600Printed in the Federal Republic of GermanyKG K 0495 3.0 SC 10 En

PowerTransmissionand Distribution

generator protection - automation-berlin.com filegenerator protection siemens lsa 2.5.6. april 1995...

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