DVR2000E Training--SECT #6 (Paralleling Set-Up)

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DVR®2000E / DVR®2000EC

Paralleling Set-Up

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DVR®2000E/EC Paralleling Set-Up - Section Overview -

This section will provide an overview of how set-up the regulator for paralleling in droop or cross-current (reactive differential). We will discuss:

Paralleling generators to one another

Paralleling generators to the utility

NOTE: This discussion is not intended to teach you how to parallel but rather instruct you on how to program the DVR®2000E/EC for paralleling. Additional paralleling guidelines are provided in the Paralleling Notes.pdf file included on the compact disk for this seminar.

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DVR®2000E/EC Paralleling Set-Up - Paralleling Recommendations/Notes -

Marathon Electric recommends that you initially parallel your generators in droop.

Refer to the DVR®2000E Installation, Operation, and Maintenance (IOM) Manual (GPN019 03/06) or the Hardware Installation Section of this presentation for connecting your DVR®2000E/EC properly.

NOTE: The DVR®2000E/EC regulator must be set-up as discussed in the programming sections of this presentation PRIOR to implementing the Paralleling Set-Up.

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DVR®2000E/EC Paralleling Set-Up- Paralleling Basics -

When paralleling:

1. KW sharing is totally controlled by

the governor

2. Amps are controlled by the governor

and the voltage regulator

3. KVAR sharing is controlled by the

voltage regulator

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DVR®2000E/EC Paralleling Set-Up- Paralleling Basics (Cont’d)-

For generators to parallel properly certain conditions must be met:

1. All unit engine governors must match in:

a) Engine speed,

b) Engine response, and

c) Load sharing

2. All generator regulators must match in:

a) Voltage,

b) Droop, and

c) Regulator response

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Sharing Example:

1) GENERATORS:

a) 2000 kW unit

b) 1000 kW unit

2) LOAD:

a) 1500 kW,

b) 0.8 PF

3) 2000 kW unit carries 1000 kW and 750 KVAR

4) 1000 kW unit carries 500 kW and 375 KVAR

5) Each unit is operating at one-half rated load

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For different size generators, droop settings will be

different for DVR®2000E/EC. For example:

GENERATORS:

a) 500 kW, 752 Amp unit

b) 600 kW, 902 Amp unit

CT: 1000:5

DROOP SETTINGS: If 600 kW unit is set for 4% droop then 500 kW

unit must be set for 4.8 % droop; therefore at one-half load both are

at 1.8 % droop

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IMPORTANT! There are no absolute correct settings, every thing is relative.

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DVR®2000E/EC Paralleling Set-Up - Initial Adjustments/Set-Up -

Carefully follow set-up instructions step by step as given in the DVR2000E Installation, Operation, and Maintenance (IOM) Manual (GPN019 - 03/06).

Do not take short cuts - these most often - will lead to very undesirable results.

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DVR®2000E/EC Paralleling Set-Up- Generator Paralleling Procedure -

1. To parallel generators, set-up one generator set for single unit operation.

2. Insure that a CT is installed on phase B of the generator and connected per Figure 4-6 (IOM Page 33).

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DVR®2000E/EC Paralleling Set-Up - Generator Paralleling Procedure (Cont’d) -

3. Open communications between the computer and the voltage regulator by clicking on Communications Menu in the top tool bar, select Open Comm Port, and click on RS-232 Port.

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4. In the Password Window type dvr (this is not case sensitive), select the appropriate COMM Port, and press Enter.

NOTE 2: Password protection does not protect against any front panel adjustments/changes.

Password = dvr

NOTE 1: Password Protection guards against unauthorized changing or viewing of the regulator settings via a computer. A single password protects all DVR2000®E/EC computer input settings. Should you decide to change the password, the new password should be stored in a secure place. If your user defined password is lost, the MARATHON-DVR®2000E-COMS program must be reinstalled to restore the default password.

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5. The default settings on the Comm Port Window are normally acceptable for most applications. If this is the case for your application, press Enter or click Initialize to proceed with the Comm Port default settings. Otherwise select the appropriate COMM Port, then press Enter or click Initialize to proceed.

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6. If everything is operating properly, a series of small windows will open to show that the information is being uploaded from the DVR2000E®/EC regulator. Every time a screen is changed on the computer, new data will be read from the regulator to insure that the screen is up to date.

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7. Referencing Page 53 of DVR®2000E IOM Manual, under the Configure Button/ System Settings Tab, enter the CT ratio ( for example 500:5 has a ratio of 100) in the lower right area of the screen under ‘Generator CT Ratio’. Click EEPROM Button to save setting.

Generator CT Ratio set to 1.0

EEPROM Button for savings settings.

Note 1: The CT must have a secondary rated at 5 amps.

Note 2: The CT ratio entered is ONLY necessary to display the proper current on the Metering Screen, it WILL NOT affect the normal operation of the regulator.

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8. Referencing Page 53 of DVR®2000E IOM Manual, click on the Settings Button/ Setpoint Tab, in the lower left under the Droop enter the value ‘4’ in the Setpoint (%) window. Click EEPROM Button to save setting.

Enter the value ‘4.0’ in the ‘Setpoint (%)’ window.

EEPROM Button for savings settings

4.00

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9. Referencing Page 53 of DVR®2000E IOM Manual, referring to the ‘Automatic Voltage Regulator (AVR)’ (AVR Setpoint (V) Window). If the generator is to operate in droop, increase the ‘AVR Setpoint (V)’ value by ‘3%’. For a 480-volt operation, the calculated value to enter would be ‘494’ volts. This will cause the generator to operate at approximately 480 Vac under load. Click EEPROM Button to save setting.

Enter the value ‘494.0’ for a 480 Vac system in the ‘AVR Setpoint (V)’ window.

EEPROM Button for savings settings

4.00

494

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10. To save the default settings as read from the regulator, click on the File Menu in the top tool bar, and then click on Save in the drop down menu to save the data.

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11. In the window that opens, type the name of the file in which the data is to be stored. You can now access any of the default settings if necessary.

NOTE: This is the recommended File Name format. To be discussed in further detail later.

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12. <OPTIONAL> For IDENTICAL generators, load these same

settings into all other regulators to be paralleled. To load

these settings to another regulator:

a) Open communications with the other DVR2000®E/EC

regulators one at a time

b) Open the file you just saved

c) Click ‘EEPROM’ Button to save this information into the

memory of that regulator

d) Repeat this procedure for each additional DVR2000®E/EC

regulator you have that you are intending to parallel with

your original generator

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13. Referencing Page 53 of DVR®2000E IOM Manual, place a resistive load on each individual generator, one at a time. Click on the ‘Metering’ Button. If the paralleling CT is connected correctly, the ‘Real Power (W)’ value will read positive and the ‘Phase Angle (Degree)’ value will read around ‘0’ or ‘360’ degrees. If the paralleling CT is connected backwards, the ‘Real Power (W)’ value will read negative and the ‘Phase Angle’ value will read around ‘180’ degrees. If the CT is connected backwards, shut-ff the generator-set and swap the connections between CT1 and CT2 on the voltage regulator.

If CT is connected correctly the Real Power (W) should read a positive and Phase Angle (Degree) will read approximately ‘0’ or ‘360’.

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WARNING: Marathon Electric recommends that you review your wiring connections (see IOM page 33) prior to paralleling your generators. Pay particular attention that the phase rotation of the generators are the same. Before closing the breaker synchronize units (i.e., match phase relationship within 5 degrees).

NOTE 1: When the generators are operating in parallel, the governor controls the kW-sharing between the generators. This can be the cause of any current unbalance when the units are paralleled. Attempting to further adjust the voltage regulators will most likely make things worse, not better.

NOTE 2: For single unit operation, a switch that is closed across terminals 52L and 52M will disable the droop function.

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14. <OPTIONAL> Now that you have confirmed that your generators will parallel in droop properly, if cross current (reactive differential) compensation is desired, the current loop can now be connected per DVR2000E Installation, Operation, and Maintenance (IOM) Manual, Page 36.

NOTE: For single unit operation a switch that is closed across terminals 52L and 52M will disable the droop function.

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DVR®2000E/EC Paralleling Set-Up- Paralleling with Utility Basics -

When paralleling with the Utility:

1. Control KW through the governor (must be

limited to rating of generator)

2. Control KVA with an appropriate controller

that operates through the voltage regulator

(must be limited to rating of generator)

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Utility is master bus, therefore: Utility determines frequency

Utility determines voltage

All generators must be set up to match utility

The generator is interfaced to the Utility through a transformer

Generator can be operated in Power Factor Control Mode or VAR Control Mode

Choice determined by customer and Utility rate

schedule

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Power Factor Control Mode causes the VAR’s to

increase and decrease in proportion to KW

VAR Control Mode maintains a level VAR’s with

power factor changing with load

A fixed VAR setting can help with power factor

correction for the plant

A ‘0’ VAR setting (or 1.0 power factor setting) allows

the generator to operate at maximum efficiency

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DVR®2000E/EC Paralleling Set-Up- Paralleling with Utility Procedure -

1. To parallel a generator to the Utility, set one DVR2000®EC regulator at a time

2. Insure that a current transformer (CT) is installed on phase B of the generator and connected per Figure 4-6 (IOM Page 33).

NOTE: You MUST use the DVR2000®EC version of the DVR2000®E/EC voltage regulator to parallel your generator to the utility.

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3. Open communications between the computer and the voltage regulator by clicking on Communications Menu in the top tool bar, select Open Comm Port, and click on RS-232 Port.

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4. In the Password Window type dvr (this is not case sensitive), select the appropriate COMM Port, and press Enter.

NOTE 2: Password protection does not protect against any front panel adjustments/changes.

Password = dvr

NOTE 1: Password Protection guards against unauthorized changing or viewing of the regulator settings via a computer. A single password protects all DVR2000®E/EC computer input settings. Should you decide to change the password, the new password should be stored in a secure place. If your user defined password is lost, the MARATHON-DVR®2000E-COMS program must be reinstalled to restore the default password.

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5. The default settings on the Comm Port Window are normally acceptable for most applications. If this is the case for your application, press Enter or click Initialize to proceed with the Comm Port default settings. Otherwise select the appropriate Comm Port, then press Enter or click Initialize to proceed.

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6. If everything is operating properly, a series of small windows will open to show that the information is being uploaded from the DVR2000E®/EC regulator. Every time a screen is changed on the computer, new data will be read from the regulator to insure that the screen is up to date.

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7. Under the Configure Button/System Settings Tab, enter the CT ratio ( for example 500:5 has a ratio of 100) in the lower right area of the screen under ‘Generator CT Ratio’. Click EEPROM Button to save setting.

Generator CT Ratio set to 1.0

EEPROM Button for savings settings.

Note 1: The CT must have a secondary rated at 5 amps.

Note 2: The CT ratio entered is ONLY necessary to display the proper current on the Metering Screen, it WILL NOT affect the normal operation of the regulator.

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8. Under the Settings Button/Setpoint Tab, enter a Droop Setpoint (%) of 2.0 and enter the desired value in the ‘Reactive Power Control’ or ‘Power Factor Control’ window. Click EEPROM Button to save setting.

Droop Setpoint set to 2.0 %

2.0

Enter desired value of ‘Reactive Power Control’ or ‘Power Factor Control’ here.

NOTE: ‘Reactive Power Control’ and ‘Power Factor Control’ will be active ONLY on a DVR2000®E/EC .

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9. Select Gain Button/Control Gain Tab, to let the Utility react to load changes keep the AVR Loop Gain (Kg) Setting down (half way between 1.0 and single unit setting). The ‘VAR/PF’ default gains have been acceptable. Click EEPROM Button to save setting.

VAR/PF default gains have been shown to be acceptable

AVR (Gain) set to level that is between 1.0 and your single unit operation setting

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10. Select Metering Button/Operation Tab, confirm that the Operating Status is in the desired mode (i.e., VAR or power factor control mode). If you make any changes, click EEPROM Button to save setting.

Confirm Operating Status

NOTE: Operating Status will be active ONLY on a DVR2000®E/EC .

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DVR®2000E/EC Paralleling Set-Up- Paralleling with Utility Procedure -

11. Connect the CT and confirm settings as discussed in previous slides

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NOTES

Shorting 52J and 52K will turn-off the VAR or PF Control Modes

The remote switch will raise or lower the operating point of the current mode

The analog input will raise or lower the operating point of the current mode

The analog input can be used to control VAR’s by an external device with a standard regulator in Voltage Regulation Mode

• These devices are mostly supplied by the governor manufacturers

• With these devices it is recommended that the regulator be set-up for 1 to 2 percent droop for more stable operation

DVR®2000E/EC Paralleling Set-Up- End of Section -

QUESTIONS?

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DVR2000E Training--SECT #6 (Paralleling Set-Up)