Siemens SIPROTEC 4 7UT6 Series Manual Download

Page: 257 / 684

Voltage Phase Sequence

If measured voltages are connected to the device and these are used, the voltage phase rotation is supervised.
On clockwise phase rotation this is done by supervising the phase sequence of the voltages
U

before U

This check is done as long as the voltages have a magnitude of at least
|U

|, |U

| > 40 V/√3

Wrong phase rotation is indicated by the alarm

Fail Ph. Seq. U

(No 176) .

Setting Notes

Measured Value Monitoring

The sensitivity of the measured value monitoring can be changed. Default values are set at the factory, which
are sufficient in most cases. If especially high operating asymmetry in the currents and/or voltages is to be
expected for the application, or if it becomes apparent during operation that certain monitoring functions acti-
vate sporadically, then the setting should be less sensitive.
The current symmetry supervision can be switched

OFF

in address 8101

BALANCE I

, the voltage super-

vision (if available) in address 8102

BALANCE U

The current phase sequence can be switched

OFF

in address 8105

PHASE ROTAT. I

; the voltage

sequence monitoring (if available) in address 8106

PHASE ROTAT. U

In address 8104

SUMMATION U

the voltage sum monitoring

OFF

can be set (if available).

Address 8111

BAL. I LIMIT M1

determines the threshold current for measuring location 1 above which

the current balance supervision is effective. Address 8112

BAL. FACT. I M1

is the associated symmetry

factor; that is, the slope of the symmetry characteristic curve. In order to avoid activation during short-term
asymmetries, the monitoring is delayed at address 8113

T Sym. I th. M1

. This parameter can only be set

with DIGSI under Additional Settings. The time delay usually amounts to a few seconds.
The same considerations apply for the further measuring locations, as far as they are available and allocated:
Address 8121

BAL. I LIMIT M2

, 8122

BAL. FACT. I M2

and 8123

T Sym. I th. M2

for measuring

location 2,
Address 8131

BAL. I LIMIT M3

, 8132

BAL. FACT. I M3

and 8133

T Sym. I th. M3

for measuring

location 3,
Address 8141

BAL. I LIMIT M4

, 8142

BAL. FACT. I M4

and 8143

T Sym. I th. M4

for measuring

location 4,
Address 8151

BAL. I LIMIT M5

, 8152

BAL. FACT. I M5

and 8153

T Sym. I th. M5

for measuring

location 5.
Address 8161

BALANCE U-LIMIT

determines the threshold voltage above which the voltage balance super-

vision is effective. Address 8162

BAL. FACTOR U

is the associated symmetry factor, i.e. the slope of the

symmetry characteristic curve (if voltages available). In order to avoid activation during short-term asymme-
tries, the monitoring is delayed at address 8163

T BAL. U LIMIT

. This parameter can only be set with DIGSI

under Additional Settings. The time delay usually amounts to a few seconds.

Settings

Addresses which have an appended “A” can only be changed with DIGSI, under “Additional Settings”.
The table indicates region-specific presettings. Column C (configuration) indicates the corresponding secon-
dary nominal current of the current transformer.

Siemens SIPROTEC 4 7UT6 Series, Manual

Search results

Summary of Contents for SIPROTEC 4 7UT6 Series

Reviews:

Related manuals for SIPROTEC 4 7UT6 Series

Brands by name

Popular brands