Basler-electric BE1-11g Uživatelský manuál stáhnout pdf (Strana 357)

100

101

9424200994 Rev N 345

CBA3

VarsVarsVarsVars ++=

where:

PNP

V ∠

−∠

For Sensing Type: Three-wire

In three-wire sensing mode, the equivalent LN voltages are determined from the LL voltages assuming

= 0V. This allows per-phase watts and vars to be determined and provides improved accuracy over a

two-element method when neutral current is present.

(3/1V

CAABAN

−⋅=

(3/1V

ABBCBN

−⋅=

(3/1V

BCCACN

−⋅=

Using the computed PN voltages, watts and vars are then computed using the equations listed under

four-wire sensing type, above.

For Single Phase Sensing Types: AN, BN, CN, AB, BC, CA

In single-phase sensing mode, the unknown PN voltages are calculated. Assuming a balanced three-

phase voltage is applied, the unknown PN voltages can be determined by scaling and rotating the

measured voltage as follows:

ABC Rotation

AN Sensing:

°−∠⋅= 1201VV

ANBN

°∠⋅= 1201VV

ANCN

BN Sensing:

°∠⋅= 1201VV

BNAN

°−∠⋅= 1201VV

BNCN

CN Sensing:

°−∠⋅= 1201VV

CNAN

°∠⋅= 1201VV

CNBN

AB Sensing:

−∠⋅=

301VV

ABAN

−∠⋅

= 1501VV

ABBN

°∠

⋅=

901V

BC Sensing:

∠⋅

= 901

ABAN

°−∠⋅= 301VV

ABBN

°−∠⋅= 1501VV

ABCN

CA Sensing:

°−∠

⋅=

150

1VV

ABAN

°∠⋅= 90

1VV

°−∠⋅= 301VV

ABCN

ACB Rotation

AN Sensing:

°∠⋅= 1201VV

ANBN

°−∠⋅= 1201VV

ANCN

BN Sensing:

°−∠⋅= 1201VV

BNAN

°∠⋅= 1201VV

BNCN

CN Sensing:

°∠⋅= 1201VV

CNAN

°−∠⋅= 1201VV

CNBN

AB Sensing:

°∠⋅= 301VV

ABAN

°∠⋅=

1501VV

ABBN

°−∠⋅=

901VV

ABCN

BC Sensing:

°−∠⋅= 90

1VV

ABAN

°∠⋅= 301VV

ABBN

°∠⋅= 1501VV

ABCN

CA Sensing:

°∠⋅= 1501VV

ABAN

°−∠⋅= 901

ABBN

°∠⋅= 301VV

ABCN

Using both the measured and calculated PN voltages, watts and vars are then computed using the

equations listed under four-wire sensing type above.

BE1-11g Configuration

1 2 ... 352 353 354 355 356 357 358 359 360 361 362 ... 671 672

Basler-electric BE1-11g Uživatelský manuál Strana 357

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Basler-electric BE1-11g Uživatelský manuál Strana 357

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