Siemens 7SA511 manual Settings for Measured Value Monitoring

7SA511 Line Protection Relay Chapter 5

Compare these presettings to the information on the completed worksheets and determine which settings you need to change to match your operating environment. When you have changed all of the necessary settings, follow the procedure described in section 5.3.4 to save the new settings.

Table 5-7.Power System Setting Options

Addr.

1101

1102

1103

1104

1105

1109

1110

1111

1112

1113

1117

1118

1119

1120

7899

LCD Text

CT STARPNT

SYSTEMSTAR

Un PRIMARY

Un SECOND.

In PRIMARY

VT DELTA

Uph/Udelta

Ie CT

Ie/Iph

CB AUX.CNT

RE/RL

XE/XL

RM/RL

XM/XL

FREQUENCY

Description

Current transformer polarity. This setting determines the measurement direction of the relay (forwards = line direction)

System neutral (starpoint) condition

VT primary rated voltage (line- to-line)

VT secondary rated voltage (line-to-line)

CT primary rated current (phases)

VT delta windings are connected or not connected

VT ratio matching factor

Ground fault detection input current connection (grounded systems only—this setting is not available for high- sensitivity ground fault configurations)

CT ratio matching factor

Indicate whether or not the cir- cuit breaker auxiliary contact is connected to a binary input

Matching of ground impedance, resistance ratio

Matching of ground impedance, reactance ratio

Matching of mutual impedance, resistance ratio

Matching of mutual impedance, reactance ratio

Rated system frequency

Preset

TOWARDS LINE

SOLIDLY

EARTHED

110kV

100V

1000 A

NOT CONNECTED

1.73

PROTECTED LINE

1.000

CONNECTED

1.00

1.00

0.00

0.00

fN 60 Hz

Options/Range

TOWARDS

BUSBAR

￿COMPENSATED ISOLATED

1 - 400 kV

100 - 125 V

10 - 5000 A

CONNECTED

0.00to 9.99

PARALLEL LINE

0.000 to 20.000

NOT CONNECTED

-7.00 to +7.00

-7.00 to +7.00

-7.00 to +7.00

-7.00 to +7.00

fN 50 Hz

5.9.2 Settings for Measured Value Monitoring (2900)

As described in Reference B, “Hardware & Software,” the relay monitors the current and voltage measuring circuits (CTs, VTs, and A/D converters) for faults. For measured value monitoring to function correctly, the system settings at addresses 1105 (CT primary current), 1112 (CT ratio matching factor), and 7899 (frequency) must be set properly.

The sensitivity of the measured values monitoring can be changed in address block 2900. Table 5- 8 identifies the factory presettings and available options. Typically, the factory presettings are

July 27, 1995 5-23