f35_função 32gx

7/31/2019 F35_Funo 32Gx

1/3

GE Multilin F35 Multiple Feeder Protection System 5-123

5 SETTINGS 5.6 GROUPED ELEMENTS

5.6.5 WATTMETRIC GROUND FAULT

a) WATTMETRIC ZERO-SEQUENCE DIRECTIONAL (ANSI 32G)

PATH: SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) WATTMETRIC... WATTMETRIC GROUND FAULT 1(4)

The wattmetric zero-sequence directional element responds to power derived from zero-sequence voltage and current in a

direction specified by the element characteristic angle. The angle can be set within all four quadrants and the power can be

active or reactive. Therefore, the element may be used to sense either forward or reverse ground faults in either inductive,capacitive or resistive networks. The inverse time characteristic allows time coordination of elements across the network.

Typical applications include ground fault protection in solidly grounded transmission networks, grounded/ungrounded/resis-

tor-grounded/resonant-grounded distribution networks, or for directionalizing other non-directional ground elements.

WATTMETRIC GND FLT 1 VOLT: The element uses neutral voltage (that is, three times the zero-sequence voltage).

This setting allows selecting between the internally calculated neutral voltage, or externally supplied voltage (broken

delta VT connected to the auxiliary channel bank of the relay). When the latter selection is made, the auxiliary channel

must be identified by the user as a neutral voltage under the VT bank settings. This element will operate only if the aux-

iliary voltage is configured as neutral.

WATTMETRIC

GROUND FAULT 1

WATTMETRIC GND FLT 1

FUNCTION: Disabled

Range: Disabled, Enabled

MESSAGEWATTMETRIC GND FLT 1

SOURCE: SRC 1

Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6


VOLT: Calculated VN

Range: Calculated VN, Measured VX


OV PKP: 0.20 pu

Range: 0.02 to 3.00 pu in steps of 0.01


CURR: Calculated IN

Range: Calculated IN, Measured IG


OC PKP: 0.060 pu


MESSAGE WATTMETRIC GND FLT 1OC PKP DEL: 0.20 s

Range: 0.00 to 600.00 s in steps of 0.01


PWR PKP: 0.100 pu



REF PWR: 0.500 pu



ECA: 0 Lag

Range: 0 to 360 Lag in steps of 1


PWR PKP DEL: 0.20 s



CURVE: Definite Time

Range: Definite Time, Inverse, FlexCurves A through D


MULTIPLIER: 1.00 s


MESSAGEWATT GND FLT 1 BLK:

Off

Range: FlexLogic operand


TARGET: Self-reset

Range: Self-reset, Latched, Disabled


EVENTS: Disabled

Range: Disabled, Enabled

7/31/2019 F35_Funo 32Gx

2/3

5-124 F35 Multiple Feeder Protection System GE Multilin

5.6 GROUPED ELEMENTS 5 SETTINGS

5

WATTMETRIC GND FLT 1 OV PKP: This setting specifies the minimum zero sequence voltage supervising the direc-

tional power measurement. This threshold should be higher than possible unbalance during normal operation of the

system. Typically, this setting would be selected at 0.1 to 0.2 pu for the ungrounded or resonant grounded systems,

and at 0.05 to 0.1 pu for solidly or resistor-grounded systems. When using externally supplied voltage via the auxiliary

voltage channel, 1 pu is the nominal voltage of this channel as per VT bank settings. When using internally calculated

neutral voltage, 1 pu is the nominal phase to ground voltage as per the VT bank settings.

WATTMETRIC GND FLT 1 CURR: The element responds to the neutral current (that is, three times zero-sequence

current), either calculated internally from the phase currents or supplied externally via the ground CT input from more

accurate sources such as the core balanced CT. This setting allows selecting the source of the operating current.

WATTMETRIC GND FLT 1 OC PKP: This setting specifies the current supervision level for the measurement of the

zero-sequence power.

WATTMETRIC GND FLT 1 OC PKP DEL: This setting specifies delay for the overcurrent portion of this element. The

delay applies to the WATTMETRIC 1 PKP operand driven from the overcurrent condition.

WATTMETRIC GND FLT 1 PWR PKP: This setting specifies the operating point of the element. A value of 1 pu is a

product of the 1 pu voltage as specified for the overvoltage condition of this element, and 1 pu current as specified for

the overcurrent condition of this element.

WATTMETRIC GND FLT 1 REF PWR: This setting is used to calculate the inverse time characteristic delay (defined

by Srefin the following equations). A value of 1 pu represents the product of a 1 pu voltage (as specified in the overvolt-

age condition for this element) and a 1 pu current (as specified in the overcurrent condition for this element.

WATTMETRIC GND FLT 1 ECA: This setting adjusts the maximum torque angle of the element. The operating power

is calculated as:

(EQ 5.17)

where * indicates complex conjugate. By varying the element characteristic angle (ECA), the element can be made to

respond to forward or reverse direction in inductive, resistive, or capacitive networks as shown in the Wattmetric char-

acteristic angle response diagram.

WATTMETRIC GND FLT 1 PWR PKP DEL: This setting defines a definite time delay before the inverse time charac-

teristic is activated. If the curve selection is set as Definite Time, the element would operate after this security time

delay. If the curve selection is Inverse or one of the FlexCurves, the element uses both the definite and inverse time

timers simultaneously. The definite time timer, specified by this setting, is used and when expires it releases the

inverse time timer for operation (torque control).

WATTMETRIC GND FLT 1 CURVE: This setting allows choosing one of three methods to delay operate signal once allconditions are met to discriminate fault direction.

The Definite Time selection allows for a fixed time delay defined by the WATTMETRIC GND FLT 1 PWR PKP DEL setting.

The Inverse selection allows for inverse time characteristics delay defined by the following formula:

(EQ 5.18)

where m is a multiplier defined by the multiplier setting, Srefis the multiplier setting, and Sop is the operating power at

the time. This timer starts after the definite time timer expires.

The four FlexCurves allow for custom user-programmable time characteristics. When working with FlexCurves, the

element uses the operate to pickup ratio, and the multiplier setting is not applied:

(EQ 5.19)

Again, the FlexCurve timer starts after the definite time timer expires.

S_op Re Vn In 1 ECA =

t mSre fSop----------=

t FlexCurve Sop

Sre f----------

=

7/31/2019 F35_Funo 32Gx

3/3

GE Multilin F35 Multiple Feeder Protection System 5-125

5 SETTINGS 5.6 GROUPED ELEMENTS

Figure 553: WATTMETRIC CHARACTERISTIC ANGLE RESPONSE

WATTMETRIC GND FLT 1 MULTIPLIER: This setting is applicable ifWATTMETRIC GND FLT 1 CURVE above is selected

to Inverse and defines the multiplier factor for the inverse time delay.

Figure 554: WATTMETRIC ZERO-SEQUENCE DIRECTIONAL LOGIC

FORWARD FAULT REVERSE FAULT

Vn

In

ECA = 180 to 270

Vn

In

ECA = 0 to 90

Vn

In

ECA = 180

Vn

In

ECA = 0

Vn

In

ECA = 90 to 180

Vn

In

ECA = 270 to 360

INDUCTIVENETWORK

RESISTIVENETWORK

CAPACITIIVENETWORK

837804A1.CDR

SETTINGS

WATTMETRIC GND FLT1 FUNCTION:

Enabled = 1

AND

WATT GND FLT 1 BLK:

Off = 0

SETTINGS

WATTMETRIC GND FLT 1SOURCE:

Neutral, In Ground, Ig

Neutral, Vn Auxiliary, Vx

WATTMETRIC GND FLT 1CURRENT:

Calculated: Measured:

WATTMETRIC GND FLT 1VOLTAGE:

Calculated: Measured:

SETTING

WATTMETRIC GND FLT 1ECA:

S = V*conj (I*exp(-j*ECA))

SETTINGS

WATTMETRIC GND FLT 1OC PICKUP:

WATTMETRIC GND FLT 1OV PICKUP:

SOP > PWR PICKUP

I > OC PICKUPMAG

WATTMETRIC GND FLT 1PWR PICKUP:

V > OV PICKUPMAGtPKP

0

SETTING

WATTMETRIC GND FLT 11 PWR PKP DEL:

SETTINGS

WATTMETRIC GND FLT 1REF PWR:

RUN

WATTMETRIC GND FLT 1MULTIPLIER:

FLEXLOGIC OPERAND

WATTMETRIC 1 OP

AND

AND

tPKP

0

SETTING

WATTMETRIC GND FLT 1OC PKP DEL:

FLEXLOGIC OPERAND

WATTMETRIC 1 PKP

837033A4.CDR

WATTMETRIC GND FLT 1CURVE:

OP

REF

S

Smt =

f35_função 32gx

Documents