Siemens ISGS SG8158-00 User Manual download pdf (Page 45)

Control & Communications

Siemens Energy & Automation, Inc. 39

Figure 6.6 Current Balance Threshold

Failure of this check will cause an event Current Balance

Error. This event can activate an output contact.

The pickup value (3422) for the current balance check

depends on the secondary phase CT rating and the value is

in secondary amperes. For 5 A CTs, the value ranges from

0.5 to 5.0 A; and the value for 1 A CTs ranges from 0.1 to

1.0 A. Both values can be set in steps of 0.1 A. If one of the

three phase currents is above the preset threshold, the mon-

itoring function is activated.

The current balance factor indicates the amount of unbal-

ance tolerated before the function generates an alarm

(3424). This factor is provided to compensate for differences

between primary CTs. It ranges from 0.1 to 0.95 and can be

set in steps of 0.01.

6.11 Parameter Sets

The ISGS relay can be programmed to operate with either of

two parameter setsset A or set B. Separate parameter

sets are programmed to satisfy separate user defined condi-

tions, such as seasonal considerations or special operating

periods. For example, set A may be used for protective set-

tings used in the summertime, whereas set B might com-

prise the settings appropriate to winter, when lower ambient

temperatures could allow higher loading than in the summer.

Alternatively, set A might be configured for normal production

periods, with set B reserved for construction or periodic

shutdown periods. The choice of two separate parameter

sets prevents the need to reconfigure the relay when condi-

tions change and different parameter settings are desired.

Figure 6.2 shows the use of these parameter sets. The val-

ues in set A or B may be chosen as the active set, and are

thus put in the relays memory for easy access. The default

set includes all the factory default values and these values

are stored in long-term memory.

Figure 6.2 Parameter Set Actions

Only certain protective function parameters have two set-

tings. All A settings are grouped under parameter set A, and

all B settings are grouped under parameter set B. Each

parameter set automatically includes all the regular parame-

ters that can be programmed to only one setting at a time

7101 Parameter Set

Address Parameter Description

7101 Active Set Displays active parameter set

(A or B)

7103 Activation Activate set A or set B

7104 Copy Default to A Copy default set to set A

7105 Copy Default to B Copy default set to set B

7106 Copy A to B Copy set A to set B

7107 Copy B to A Copy set B to set A

Save

Copy

Activate

Default

Set

Active

Set

Set B

Set A

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Siemens ISGS SG8158-00 User Manual Page 45

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