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DIgSILENT Technical Documentation

SEL Directional block

DIgSILENT GmbH Heinrich-Hertz-Strasse 9 D-72810 Gomaringen Tel.: +49 7072 9168 - 0 Fax: +49 7072 9168- 88 http://www.digsilent.de e-mail: [email protected]

Sel Directional block Published by DIgSILENT GmbH, Germany Copyright 2003. All rights reserved. Unauthorised copying or publishing of this or any part of this document is prohibited. doc.TechRef, Build 233 27 März 2007

SEL directional block

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Table of Contents

Table of Contents 1 GENERAL DESCRIPTION ....................................................................................................................................... 4 2 USING THE BLOCK ................................................................................................................................................ 5 3 AVAILABLE SEL DIRECTIONAL TYPES .................................................................................................................. 6 3.1 SEL321.......................................................................................................................................................................... 7 3.2 SEL 351 ........................................................................................................................................................................ 7 3.3 SEL351R ....................................................................................................................................................................... 7 4 INPUT PARAMETERS DEFINITION........................................................................................................................ 8 4.1 DIRECTIONAL TYPE (TYPSELDIR)................................................................................................................................... 8 4.2 SEL DIRECTIONAL ELEMENT (RELSELDIR) ...................................................................................................................... 8 5 INPUT/OUTPUT SIGNALS DEFINITION ................................................................................................................ 9

SEL directional block

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1 General description

1 General description The SEL directional block is a full implementation of the new directional logic used by the Schweitzer devices. Such logic is using the negative and the zero sequence impedances to detect the direction of both the phase and the ground fault current. At the moment the block is completely supporting the directional detection features of the SEL 321, SEL 351 and SEL351R. It means that the SEL 321logic is using only a Negative sequence current negative voltage polarized directional logic. The SEL351 and SEL351R logic is more complicate and consists of a combination of three directional elements: •

Zero-sequence current-polarized (321).

•

Negative-sequence voltage-polarized (32Q).

•

Zero-sequence voltage-polarized (32V).

The logic selects the optimal directional element for each system condition. The Zero-sequence current-polarized equation is:

T = I pol 3I 0 cos(∠I pol − ∠3I 0 ) where: Ipol 3I0

Polarizing quantity Operating quantity: 310= IA+ IB+ lc

The Negative-sequence voltage-polarized equation is:

Z2 =

[

Re V2 (1∠Θ L 2 * I 2 )

*

I2

]

2

where: V2 = Negative-sequence voltage = (VA+ a2VB+ aVc)/3 I2 = Negative-sequence current (IA + a2IB + alc)/3 ΘL2 Line negative-sequence impedance angle

The Zero-sequence voltage-polarized equation is:

Z0 =

[

Re 3V0 (1∠Θ L 0 * I 0 )

*

3I 0

]

2

SEL directional block

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2 Using the block

where: V0 = Zero-sequence voltage = (VA+ VB+ Vc)/3 I0 = Zero-sequence current (IA + IB + lc)/3 ΘL0 Line zero-sequence impedance angle

For more details regarding such detection method please refer to: http://www.selinc.com/techpprs/6026.pdf http://www.selinc.com/techpprs/6072.pdf http://www.selinc.com/techpprs/6036.pdf http://www.selinc.com/techpprs/6009.pdf http://www.selinc.com/techpprs/6012.pdf http://www.selinc.com/appguide/9902.pdf (SEL351R sensitive directional element)

2 Using the block The SEL directional type class name is TypSeldir; the SEL directional element class name is RelSeldir.

Figure 1: The RelSeldir dialog main page (SEL 351R)

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3 Available SEL directional types

Please note that such directional block interface is including the directional settings which are usually part of the single distance tripping zone of the impedance devices. In other words it’s inside this block that the directional setting of each trip element must be set using the “Level 1 direction”, “Level 2 direction” etc combo boxes. 16 separated enabling outputs are available.4 for each of the main “families” of protective elements: the positive sequence elements family, the negative sequence elements family, the neutral current elements family and the residual current elements family. The block is also providing the outputs to control the phase, ground and negative sequence overcurrent element (51P,51N,51Q). The directional type is set using the “Relay model” parameter in the SelDir type dialog (TypSeldir) main page.

3 Available SEL directional types 3 different types of SEL directional logic are available: • SEL321 • SEL351 • SEL351R

Figure 2: The TypSelDir dialog main page with the “Relay Model” combobox open

SEL directional block

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3 Available SEL directional types

3.1 SEL321 It fully supports the Schweitzer SEL 321 directional element: with reference the 321-3_im_20010417.pdf ( http://www.selinc.com/instruction_manual/321-3/321-3_IM_20030404.pdf )manual the logic implements Figure 2.22 scheme (pag#2-63) . The “loss of potential” and the “open pole logic” are implemented using simplified schemes (the reference schemes are figure 2.37 and 2.39 (pag#2-73-75))

3.2 SEL 351 It fully supports the Schweitzer SEL 351 directional element: with reference the 351-5-6-7_im_20010307.pdf (http://www.selinc.com/instruction_manual/351-5,6,7/351-5-67_IM_20030908.pdf) manual the logic implements Figure 4.5 (pag#4-11), Figure 4.6 scheme (pag#4-12), Figure 4.7 scheme (pag#4-13), Figure 4.8 scheme (pag#4-14), Figure 4.9 scheme (pag#4-15), Figure 4.10 scheme (pag#4-16), Figure 4.11 scheme (pag#4-16), Figure 4.12 scheme (pag#4-17), Figure 4.14 scheme (pag#4-21), Figure 4.15 scheme (pag#4-22), Figure 4.16 scheme (pag#4-23), Figure 4.17 scheme (pag#4-24), Figure 4.18 scheme (pag#4-25) . . The “loss of potential” is implemented using the Figure 4.1 scheme (pag#4-1), the “open pole logic” is implemented using the Figure 5.3 scheme (pag#5-8).

3.3 SEL351R It fully supports the Schweitzer SEL 351 directional element: with reference the 351R_IM_20021119.pdf (http://www.selinc.com/instruction_manual/351r/351R_IM_20021119.pdf) manual the logic implements Figure 4.5 (pag#4-11) Figure 4.6 scheme (pag#4-12), Figure 4.7 scheme (pag#4-12), Figure 4.8 scheme (pag#4-13), Figure 4.9 scheme (pag#4-14), Figure 4.10 scheme (pag#4-15), Figure 4.11 scheme (pag#4-16), Figure 4.12 scheme (pag#4-17), Figure 4.13 scheme (pag#4-17), Figure 4.14 scheme (pag#4-18), Figure 4.15 scheme (pag#4-19), Figure 4.17 scheme (pag#4-23), Figure 4.18 scheme (pag#4-24), Figure 4.19 scheme (pag#4-25), Figure 4.20 scheme (pag#4-25), Figure 4.21 scheme (pag#4-26) . The “loss of potential” is implemented using the Figure 4.1 scheme (pag#4-1), the “open pole logic” is implemented using the Figure 5.3 scheme (pag#5-6).

SEL directional block

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4 Input Parameters definition

4 Input Parameters definition 4.1 Directional Type (TypSeldir) Parameter

Description

Relaymodel

Relay model (SEL321,SEL351,SEL351R)

Unit

dir1pos

Level 1 direction (F,R,N or F,R or F,N or R,N or F:N)

dir2pos

Level 2 direction (F,R,N or F,R or F,N or R,N or F:N)

dir3pos

Level 3 direction (F,R,N or F,R or F,N or R,N or F:N)

dir4pos

Level 4 direction (F,R,N or F,R or F,N or R,N or F:N)

rs50P32P

Range of the phase directional element 3-phase pickup threshold

Amps

rs50GFP

Range of the forward directional residual ground pickup threshold

Amps

rs50GRP

Range of the reverse directional residual ground pickup theshold

Amps

Ts

Pickup Time

Sec

rZ0F

Range of the forward directional Z0 threshold

Ohm

rZ0R

Range of the reverse directional Z0 threshold

Ohm

rZ0

Range of the zero sequence line impedance magnitude threshold

Ohm

Rphi0

Range of the zero sequence line impedance angle threshold

Ohm

rs50LP

Range of the load detection phase pickup threshold

Amps

ra0

Range of the zero sequence current restraint factor a0 = I0/I1

Amps

rs50QF

Range of the forward directional current threshold

Amps

rs50QR

Range of the reverse directional current threshold

Amps

rZ2F

Range of the forward directional Z2 threshold

Ohm

rZ2R

Range of the reverse directional Z2 threshold

Ohm

RZm

Range of the positive sequence line impedance magnitude threshold

Ohm

Rphi

Range of the positive sequence line impedance angle threshold

ra2

Range of the positive sequence current restraint factor a2 = I2/I1

rk2

Range of the zero sequence current restraint factor k2 = I2/I0

4.2 Sel directional Element (RelSeldir) Parameter

Description

Unit

ORDER

Ground directional element priority

OFF , Q , V , I , Q V , Q I , V Q , V I , I V , Q , Q V I, Q I V, V Q I , V I Q , I Q V,I VQ

DIR1

Level 1 direction

F,R,N

DIR2

Level 2 direction

F,R,N

DIR3

Level 3 direction

F,R,N

DIR4

Level 4 direction

F,R,N

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5 Input/output Signals definition

s51PTC

Phase(51P) Torque Control

M2P,N

s51NTC

Residual(51N) Torque Control

32QF,32QR,Z2G,N

s51QTC

Negative sequence(51Q) Torque Control:

32QF,32QR,M2P,Z2G,N

ELOP

Loss Of Potential enable setting

Y,Y1,N

s3PVOLT

True 3-phase voltage connected 3PVOLT flag

E32IV

Ground directional element enabling flag

s50P32P

Phase directional element 3-phase pickup threshold

Amps

s50GFP

Forward directional residual ground pickup threshold

Amps

s50GRP

Reverse directional residual ground pickup theshold

Amps

Z0F

Forward directional Z0 threshold

Ohm

Z0R

Reverse directional Z0 threshold

Ohm

Z0

Zero sequence line impedance magnitude threshold

Ohm

phi0

Zero sequence line impedance angle threshold

Ohm

s50LP

Load detection phase pickup threshold

Amps

a0

Zero sequence current restraint factor a0 = I0/I1

Amps

s50QF

Forward directional current threshold

Amps

s50QR

Reverse directional current threshold

Amps

Z2F

Forward directional Z2 threshold

Ohm

Z2R

Reverse directional Z2 threshold

Ohm

Zm

Positive sequence line impedance magnitude threshold

Ohm

Phi

Positive sequence line impedance angle threshold

a2

Positive sequence current restraint factor a2 = I2/I1

k2

Zero sequence current restraint factor k2 = I2/I0

5 Input/output Signals definition Input Signal

Description

Unit

I1

Positive sequence Current

Amps

I0r

Zero sequence current real part

Amps

I0i

Zero sequence current imaginary part

Amps

I2r

Negative sequence current real part

Amps

I2i

Negative sequence current imaginary part

Amps

Inr

Neutral current real part

Amps

Ini

Neutral current imaginary part

Amps

I1r

Positive sequence current real part

Amps

I1i

Positive sequence current imaginary part

Amps

U1

Positive sequence voltage

Volt

U2r

Negative sequence voltage real part

Volt

U2i

Negative sequence voltage imaginary part

Volt

U0x3r

Zero sequence voltage real part

Volt

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5 Input/output Signals definition

U0x3i

Zero sequence voltage imaginary part

Volt

U1r

Positive sequence voltage real part

Volt

U1i

Positive sequence voltage imaginary part

Volt

M2PStart

Starting signal coming from the phase (Mho) zone #2

Z2GStart

Starting signal coming from the ground zone #2

BreakerStatus

Breaker status signal (1 = closed,0 = open). At the moment not used

Output Signal

Description

Fwd_I1

Signal on when the positive sequence element detects a forward fault

Fwd_I2

Signal on when the negative sequence element detects a forward fault

Fwd_I0

Signal on when the zero sequence element detects a forward fault

Fwd_IN

Signal on when the neutral current element detects a forward fault

rev_I1

Signal on when the positive sequence element detects a reverse fault

rev_I2

Signal on when the negative sequence element detects a reverse fault

rev_I0

Signal on when the zero sequence element detects a reverse fault

rev_IN

Signal on when the neutral current element detects a reverse fault

I0Level1

I0 level 1 enabling signal

I0Level2

I0 level 2 enabling signal

I0Level3

I0 level 3 enabling signal

I0Level4

I0 level 4 enabling signal

INLevel1

IN level 1 enabling signal

INLevel2

IN level 2 enabling signal

INLevel3

IN level 3 enabling signal

INLevel4

IN level 4 enabling signal

I1Level1

I1 level 1 enabling signal

I1Level2

I1 level 2 enabling signal

I1Level3

I1 level 3 enabling signal

I1Level4

I1 level 4 enabling signal

I2Level1

I2 level 1 enabling signal

I2Level2

I2 level 2 enabling signal

I2Level3

I2 level 3 enabling signal

I2Level4

I2 level 4 enabling signal

_51PTC

Signal enabling the phase overcurrent element (51P)

_51NTC

Signal enabling the neutral overcurrent element (51N)

_51QTC

Signal enabling the negative sequence overcurrent element (51Q)

SEL directional block

Unit

10