Thytronic Pro-N NVA100X-D

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NVA100X-D - Manual - 02 - 2016

FUNCTION CHARACTERISTICS

The ﬁ rst threshold trip (U<) may be inhibited by start of the second threshold (U<<) by setting ON

the U< Disabling by U<< start (U<disbyU<<) parameter available inside the Set \ Proﬁ le A(or B) \

Undervoltage-27 \ U<< Element \ Setpoints menu.

User can disable both 27 protection thresholds from the keyboard. During this command, the trip

output relay (U <and / or U << thresholds) are forced to reset state, the message “27 Disabled” is

displayed and all LEDs blink until the end of the command.

Breaker failure (BF)

All undervoltage elements can produce the Breaker Failure output if the U< BF and U<< BF pa-

rameters are set to ON. The parameters are available inside the Set \ Proﬁ le A(or B) \ Undervoltage

- 27 \ U< Element (U<< Element) \ Setpoints menus.

[1]

VT monitoring (74VT)

Both the protection elements are blocked off whenever the VT supervision function is active, so

that no unwanted trip can arise if any fault on the VTs secondary circuits (break, fuse trip, etc)

are detect;

[2]

the Block functions enable from 74VT parameter 74VT-BK-EN is available inside the

Set \ VT supervision -74VT.

For every of the two elements the logic block is available:

Logical block (Block1)

If the U<BLK1 and/or U<<BLK1 enabling parameters are set to ON and a binary input is designed

for logical block (Block1), the protection is blocked off whenever the given input is active.

The trip timer is held in reset condition, so the operate time counting starts when the input block goes

down.

[3]

The enabling parameters are available inside the Set \ Proﬁ le A(or B) \ Undervoltage - 27 \

U< Element (U<< Element) \ Setpoints menus, while the Block1 function must be assigned to the

selected binary input inside the Set \ Board1(2) inputs \ Binary input IN1-1...INx-x menus.

All parameters can be set separately for A and B setting proﬁ les

Note 1 The common settings concerning the Breaker failure protection are adjustable inside the Breaker Failure - BF menu.

Note 2 The exhaustive treatment of the VT supervision function may be found in the “VT supervision - 74VT” paragraph inside CONTROL AND MONI-

TORING section.

Note 3 The exhaustive treatment of the logical block (Block 1) function may be found in the “Logic Block” paragraph inside CONTROL AND MONITOR-

ING section.

all-F27.ai

U< Element

U<< Element

MMI

Start U<<

Start U<< Start U<

Trip U<Trip U<<

U< disbyU<<

U< inhibition

def

inv

def

U<<

def

U<<

def

inv

U< CurveU< EnableState

Block1

BLK1U<

U<BLK1

Start U<

Block1

BLK1U<<

U<<BLK1

Start U<<

U<BF

Trip U<

U<BF

U<<BF

Trip U<<

U<<BF

74VT

AND

Common conﬁguration

Utype27

Disable 27-37-81 functions by operator

Logic27

General logic diagram of the undervoltage elements - 27

all-F27.ai

U< Element

U<< Element

MMI

Start U<<

Start U<< Start U<

Trip U<Trip U<<

U< disbyU<<

U< inhibition

def

inv

def

U<<

def

U<<

def

inv

U< CurveU< EnableState

Block1

BLK1U<

U<BLK1

Start U<

Block1

BLK1U<<

U<<BLK1

Start U<<

U<BF

Trip U<

U<BF

U<<BF

Trip U<<

U<<BF

74VT

AND

Common conﬁguration

Utype27

Disable 27-37-81 functions by operator

Logic27

General logic diagram of the undervoltage elements - 27

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