Siemens / Stator ground fault protection 90 % _ Setting & highlights _ SI5087

Overview

The “Stator ground fault protection 90 %” function detects ground faults in the stator of generators and motors. It can be used for unit connections and busbar connections, and evaluates the fundamental signals of the residual voltage (zero-sequence voltage V0) and of the ground current (zero-sequence current 3I0). By using this function, between 80 % and 95 % of the stator ground fault protection can be implemented depending on the design of the load equipment.

For more detailed information on “Stator ground fault protection 90 %” function, refer to SIPROTEC 5 devices, V8.30 & higher manuals.

To see other supported functions, click here.

Possible Assignment of the Stage Types to the Measuring Points of the Function Group Generator Stator with a Unit Connection

Possible Assignment of the Stage Types to the Measuring Points of the Function Group Generator Stator with a Bus Connection

Structure/Embedding of the Function

Setting Parameters

General Setting parameters

Addr.	Parameter	C	Setting Options	Default Setting
General
_:2311:103	General:Dropout delay		0.00 s to 60.00 s	1.00 s
_:2311:104	General:Core balance CT- current 1	1 A @ 100 Irated	0.030 A to 35.000 A	0.050 A
		5 A @ 100 Irated	0.15 A to 175.00 A	0.25 A
		1 A @ 1.6 Irated	0.001 A to 1.600 A	0.050 A
		5 A @ 1.6 Irated	0.005 A to 8.000 A	0.250 A
_:2311:105	General:Core balance CT- current 2	1 A @ 100 Irated	0.030 A to 35.000 A	1.000 A
		5 A @ 100 Irated	0.15 A to 175.00 A	5.00 A
		1 A @ 1.6 Irated	0.001 A to 1.600 A	1.000 A
		5 A @ 1.6 Irated	0.005 A to 8.000 A	5.000 A
_:2311:106	General:CT angle error at I1		0.0 ° to 5.0 °	0.0 °
_:2311:107	General:CT angle error at I2		0.0 ° to 5.0 °	0.0 °

Setting parameters for Non-Directional V0 Stage with Zero-Sequence Voltage/Residual Voltage

Addr.	Parameter	C	Setting Options	Default Setting
V0> 1
_:12391:1	V0> 1:Mode		off on test	off
_:12391:2	V0> 1:Operate & flt.rec. blocked		no yes	no
_:12391:10	V0> 1:Blk. by meas.-volt. failure		no yes	yes
_:12391:109	V0> 1:Detection of faulty phase		no yes	no
_:12391:8	V0> 1:Method of meas- urement		fundamental comp. fund. comp. long filter RMS value	fundamental comp.
_:12391:3	V0> 1:Threshold		0.300 V to 200.000 V	30.000 V
_:12391:4	V0> 1:Dropout ratio		0.90 to 0.99	0.95
_:12391:107	V0> 1:Pickup delay		0.00 s to 60.00 s	0.00 s
_:12391:6	V0> 1:Operate delay		0.00 s to 60.00 s	3.00 s
_:12391:101	V0> 1:V> healthy ph-to- gnd volt.		0.300 V to 200.000 V	70.000 V
_:12391:104	V0> 1:V< faulty ph-to- gnd volt.		0.300 V to 200.000 V	30.000 V

Setting parameters for Directional Stator Ground-Fault Protection with 3I0-φ(V,I) Measurement

Addr.	Parameter	C	Setting Options	Default Setting
3I0> φ(VI) #
_:1	3I0> φ(VI) #:Mode		off on test	off
_:2	3I0> φ(VI) #:Operate & flt.rec. blocked		no yes	no
_:10	3I0> φ(VI) #:Blk. by meas.-volt. failure		no yes	yes
_:27	3I0> φ(VI) #:Blk. w. inrush curr. detect.		no yes	no
_:106	3I0> φ(VI) #:Directional mode		forward reverse	forward
_:104	3I0> φ(VI) #:Rotation angle of ref. volt.		-180 ° to 180 °	-45 °
_:103	3I0> φ(VI) #:Forward section +/-		0 ° to 90 °	88 °
_:102	3I0> φ(VI) #:Min. V0> for dir. determ.		0.300 V to 200.000 V	2.000 V
_:101	3I0> φ(VI) #:3I0> threshold value	1 A @ 100 Irated	0.030 A to 100.000 A	0.050 A
		5 A @ 100 Irated	0.150 A to 500.000 A	0.250 A
		1 A @ 1.6 Irated	0.001 A to 1.600 A	0.050 A
		5 A @ 1.6 Irated	0.005 A to 8.000 A	0.250 A
_:105	3I0> φ(VI) #:Dir. deter- mination delay		0.00 s to 60.00 s	0.10 s
_:6	3I0> φ(VI) #:Operate delay		0.00 s to 60.00 s	0.50 s

Setting parameters for Non-Directional 3I0 Stage

Addr.	Parameter	C	Setting Options	Default Setting
3I0> #
_:1	3I0> #:Mode		off on test	off
_:2	3I0> #:Operate & flt.rec. blocked		no yes	no
_:27	3I0> #:Blk. w. inrush curr. detect.		no yes	no
_:8	3I0> #:Method of measure- ment		fundamental comp. RMS value	fundamental comp.
_:3	3I0> #:Threshold	1 A @ 100 Irated	0.030 A to 100.000 A	0.050 A
		5 A @ 100 Irated	0.150 A to 500.000 A	0.250 A
		1 A @ 1.6 Irated	0.001 A to 100.000 A	0.050 A
		5 A @ 1.6 Irated	0.005 A to 50.000 A	0.250 A
_:102	3I0> #:Pickup delay		0.00 s to 60.00 s	0.00 s
_:6	3I0> #:Operate delay		0.00 s to 60.00 s	0.30 s

Siemens / Stator ground fault protection 90 % _ Setting & highlights _ SI5087

Overview

Possible Assignment of the Stage Types to the Measuring Points of the Function Group Generator Stator with a Unit Connection

Possible Assignment of the Stage Types to the Measuring Points of the Function Group Generator Stator with a Bus Connection

Structure/Embedding of the Function

Setting Parameters

General Setting parameters

Setting parameters for Non-Directional V0 Stage with Zero-Sequence Voltage/Residual Voltage

Setting parameters for Directional Stator Ground-Fault Protection with 3I0-φ(V,I) Measurement

Setting parameters for Non-Directional 3I0 Stage

Logic Diagrams & highlights

Logic Diagram of the Cross-Stage Functionality of the Stator Ground Fault Function

Sign Definition for the Measured Value

Correction of the Transmission Characteristic Curve of a Core Balance Current Transformer

Logic Diagram of an Overvoltage Protection with Zero-Sequence Voltage/Residual Voltage Stage

Unit Connection with Neutral-Point Transformer

Unit Connection with Grounding Transformer

Logic Diagram of the Stage Control

Logic Diagram Directional Stator Ground-Fault Protection Stage with 3I0-φ(V,I) Measurement

Parameters for Setting the Directivity

Determination of th Ground-Fault Direction in a Busbar Connection

Ground-Current Differential Protection in a Busbar Connection

Logic of the Sensitive Ground-Current Protection with 3I0

Generator-Protection Application with Possible Measuring Points