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Location: Bharuch , Gujarat , India
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DROOP

01/22/2010 8:32 PM

What can we do for droop set in Alternator ? voltage and speed droop ? pls send me detail method

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jayesh b sathwara
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#1

Re: DROOP

01/23/2010 10:58 AM
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Guru

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#2
In reply to #1

Re: DROOP

01/23/2010 1:31 PM

There are lot of information already exists in this forum as wareagle searched for you.

I would suggest you to read the manual of the Governor (for speed droop setting for KW control) and AVR (for voltage droop setting for KVAR control). The manuals should have the detail steps for these settings. For simple cases, both Governor and AVR should have a droop setting knob and you just set the knob with required settings. Generally, the Governor droop setting is 4% and AVR droop setting is 2%. Governor droop setting also may need to change some hardwire connection change to differentiate it from isochronous mode. Again, your best help for detail settings should be from the manuals or the manufacturers.

- MS

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#3

Re: DROOP

01/24/2010 2:13 AM

Dear Jayesh,

The voltage Droop is required to be set in Alternator , where as the speed droop is to be set on the Prime Mover. These droops are necessary for the kVAR & kW Sharing of the Load after the synchronisation of the Generators.

The Voltage droop will lower the alternator terminal voltage with a proportation of load set in the Automatic Voltage Regulator, Similarly the speed droop will lower the Speed of the Prime mover with the proportation of Load set int eh Engine Governer controller.

The Droop is to be set on LOAD only.

For achieving the Voltage droop you need to have a QDCT (Quadrature Droop Current Transformer) in the allternator, Primary should be connected in series with the W Phase & the secondary should be connected to the AVR.

Depending upon the Alternator Manufacturer the Specifications of the QDCT will change, I Suppose today every alternator above 200 kVA is equipped witht he QDCT & the AVR suitable for the QDCT.

During Synchronisation, you need to put the some load on the Generating Set & adjust the Droop pot on the AVR to Lower the Voltage ( Normally the Droops are set at 4% at Full Load) till you acheve the Desired Droop at the same time the Prime Mover Droop is to be adjusted exactly the same as alternator droop. Now you need to adjust the balance generating sets with the same load ( kW & PF should be same) for the same Droop %.

Do not forget to use single meter to measure the value of voltages, so that the error of the Volt meter can be neglected. Secondly do not forget the set & exactly match the No Load Voltages & speed of the generating sets to be synchronised.

Best of Luck,

By the way can I know the Alternator Make & the engine Make with the KVA Ratings & where are you going to attempt this..

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Power-User

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#4

Re: DROOP

01/24/2010 2:15 AM

Term of droop setting belongs to the engine. Not directly related to the alternator.

For a standalone generator set, of which not paralleled any other machine does not need any droop setting. Then the drop setting should be set to fix "0"

Droop setting is only needed for the purpose of simple proportional load sharing when generators are paralleled. Droop and Gain settings are located on the electronic fuel governor, on the engine, to advance or retard the phase angle of the engine in accordance with the shared load proportion to the other machine(s) , after the machines are electrically coupled to each other.

If any automatic device, to ensure Proportional Load Sharing is in control, then there is no need to set any droop setting. This is the job of the automatic device.

Kindest Regards

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Power-User
Engineering Fields - Power Engineering - New Member

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Location: Abuja, Nigeria.
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#5

Re: DROOP

01/24/2010 7:57 AM

pls. am sorry I did not get u right. do you mean quadrature droop setting or voltage and speed ( two dependent brothers ) of ur alternator is dropping. If the latter is the case let me have the specification of ur drive engine.

Dickson. Abuja Nigeria

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