ABB UNITROL® 1010 Indirect Excitation System

ABB UNITROL® 1010 Indirect Excitation System

DESRIPTION

UNITROL 1010 and UNITROL 1020 are automatic voltage regulators (AVR) for  synchronous machines of up to 80 MVA. The AVRs can be used for the excitation  of indirectly excited synchronous machines and motors. The AVRs can also  operate as a reactive power regulators, power factor regulators or field current  regulators.

Obey these safety precautions before you do work on the system: 

1. Clearly identify the work location and equipment. 

2. Disconnect all possible voltage sources. Make sure that reconnection is not  possible. Lock out and tag out. 

• Open the main disconnecting device of the AVR. 

• Disconnect any external power sources from the control circuits before  you do work on the control cables. 

• If you have a permanent magnet generator connected to the AVR,  disconnect it from the AVR with a safety switch or by other means. 

• After you disconnect the AVR, always wait for 5 minutes to let the  intermediate circuit capacitors discharge before you continue. 

• Do not do work on the AVR when the amber warning LED flashes. 

3. Protect any other energized parts in the work location against contact. 

4. Take special precautions when you are near bare conductors. 

5. Measure that the installation is de-energized. 

• Use a multimeter with an impedance of at least 1 Mohm. 

• Make sure that the voltage between the AVR input power terminals  (PWR L1, PWR L2 and PWR L3) and the grounding terminal (PE) is near  0 V. 

• Make sure that the voltage between the AVR output terminals (IE+, IEand ExCap) and the grounding terminal (PE) is close to 0 V. 6. Install temporary grounding as required by the local regulations. 

7. Ask for a permit to work from the person in control of the electrical  installation work.

Consider the residual danger areas when you do work on the excitation system: 

• Danger from live equipment inside the excitation system, if the protective  covers are removed. 

• Hazardous voltages from the rotor field winding and the secondary side of  the excitation transformer. 

• Danger from charged capacitors if a cabinet door is open immediately after  the system stops. 

• Danger from main and auxiliary voltages when cubicle doors are open.

Mechanical installation

For detailed information on mechanical installation, refer to the User Manual. Install the AVR in an indoor area that is dry and dust-free, and that does not  contain volatile gases, acid fumes or similar hazards. Examine the installation area and refer to technical data to make sure that: 

• The maximum ambient temperature is in the permitted range. 

• The vibration is limited and within the permitted class. 

• The ingress protection and pollution degree are suitable. 

• The EMC environment is suitable

Installation requirements: 

• Install the AVR vertically to make sure that cooling operates correctly. 

• Free space requirements: 

• 50 mm above the AVR 

• 20 mm below the AVR 

• 10 mm on the left and right sides of the AVR 

• Make sure that there is sufficient cooling air flow around the AVR. 

• Make sure that other devices do not blow hot air on to the AVR. 

• The AVR is designed to be installed with suitable hardware to an installation  plate. 

• Make sure that the frame of the AVR is electrically grounded (PE) to the  installation plate with a grounding wire (≥4 mm2) through a mounting hole.  Use toothed washers to get a good electrical ground contact.

Installation procedure: 

1. Refer to Dimensions for the mounting hole dimensions. 

2. Make the appropriate holes in the installation plate. 

3. Attach the AVR to the installation plate with suitable hardware, for example,  M6 screws to a torque of 10 Nm. The mounting holes have a diameter of  6.5 mm. 

4. Make sure that there is a good electrical ground connection between the  installation plate and the AVR. The installation plate must be electrically  grounded (PE).