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Q Droop CT Fitting

This document provides instructions for connecting parallel droop current transformers (CTs) to 3-phase and single-phase generators. It explains that the primary connections (P1 and P2) of the CT connect to specific terminals on the generator stator depending on the generator frame size. The secondary connections (S1-S2) of the CT connect to corresponding terminals on the automatic voltage regulator to provide droop control signals. Diagrams illustrate typical CT mounting arrangements for different generator frame sizes.

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Muhammad Shoaib Hussain
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2K views2 pages

Q Droop CT Fitting

This document provides instructions for connecting parallel droop current transformers (CTs) to 3-phase and single-phase generators. It explains that the primary connections (P1 and P2) of the CT connect to specific terminals on the generator stator depending on the generator frame size. The secondary connections (S1-S2) of the CT connect to corresponding terminals on the automatic voltage regulator to provide droop control signals. Diagrams illustrate typical CT mounting arrangements for different generator frame sizes.

Uploaded by

Muhammad Shoaib Hussain
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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PARALLEL DROOP CT FITTING INSTRUCTIONS

FOR 3 PHASE GENERATORS

PRIMARY CONNECTION P1
NOTE 1: P1- P2 MARKERS ARE MOULDED ONTO THE TRANSFORMER BOBBIN.
NOTE 2: REFER TO THE CONNECTION DIAGRAMS SUPPLIED WITH THE GENERATOR.
NOTE 3: TYPICAL CT MOUNTING ARRANGEMENTS ARE SHOWN ON PAGE 2.

FOR GENERATOR FRAME SIZES, BC, UC, AND HC4


The long leg of the CT primary bar is ‘P1’, which is bolted to the Generator main terminal.
For 12 wire re-connectable stators, the ‘P1’ Primary bar is bolted to the centre point of the ‘W’ phase,
(Series Star), or to the Neutral terminal, (Parallel Star or Series Delta).

FOR GENERATOR FRAME SIZES HC5, HC6, HC7 AND P7


The short leg of the CT primary bar is ‘P1’, which is bolted to the Neutral terminal, (Star connection), or to
the phase terminal, (Delta connection).

PRIMARY CONNECTION P2
FOR ALL FRAME SIZES – PRIMARY ‘P2’ IS CONNECTED TO THE MAIN STATOR LEAD(S) MARKED ‘W2’
THE NUMBER OF ‘W2’ STATOR LEADS CONNECTED TO ‘P2’ CHANGES WITH FRAME SIZE:-
Frames BC, UC, and HC4, ONE ‘W2’ lead, is connected to ‘P2’, = 100% current through CT.
Frames HC5 and HC6 , ONE HALF of the ‘W2’ leads are connected to ‘P2’, = 50% current through CT.
Frames HC7 and P7, ONE QUARTER of the ‘W2’ leads are connected to ‘P2’, = 25% current through CT.

NOTE : A SIMPLE CALCULATION WILL CHECK THAT THE DROOP CT IS SUPPLIED WITH THE CORRECT CURRENT :-
CORRECT PERCENTAGE OF ‘‘W2’ LEADS THROUGH CT =
(CURRENT RATING OF THE DROOP CT / FULL LOAD CURRENT RATING OF THE GENERATOR) X 100

SECONDARY CONNECTIONS S1 - S2

FOR ALL FRAME SIZES, ‘S1–S2’ ARE CONNECTED TO CORRESPONDING AVR TERMINALS ‘S1-S2’
NOTE 1 – IMPORTANT! POLARITY MUST BE CORRECT; DROOP REVERSAL WILL CAUSE INCORRECT CURRENT SHARING.
NOTE 2 - FOR AVR TYPE MX321 ONLY, CONNECT TO ‘W’ S1 – S2 TERMINALS.

Droop ct/jvs Page 1 25/01/2012


TYPICAL FITTING OF THE DROOP CT TO FRAMES BC, UC, & HC4 GENERATORS

W5 (In Star connection)

TYPICAL FITTING OF THE DROOP CT TO FRAMES HC5, HC6, HC7, & P7 GENERATORS

Neutral bar
(In Star connection)

1 PHASE GENERATORS ONLY

Single phase connected generators require a special parallel droop kit comprising of a droop CT, and
burden choke. Refer to factory for connection details and wiring diagrams.

Droop ct/jvs Page 2 25/01/2012

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