Staco Energy StacoVAR User Manual

Power factor correction

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Together We Power On

StacoVAR

Power Factor Correction

USER MANUAL

003-2703 REV A

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Page 1 Together We Power On StacoVAR Power Factor Correction USER MANUAL 003-2703 REV A...
Page 2 Staco Energy is highly specialized in the development and production of power factor correction systems (PFC). The PFC’s of this series are high quality products, carefully designed and manufactured to ensure optimum performance. No reproduction of any part of this manual, even partial, is permitted without the authorization of Staco Energy Products Company.
Page 3 Safety Warnings IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS Symbols used in the Manual In this manual, some operations are shown by graphic symbols to alert the reader to the dangerous nature of the operations: Danger / Risk of Electric Shock This symbol indicates possibility of serious injury or substantial damage to the unit unless adequate precautions are taken.
Page 4 GENERAL PRECAUTIONS This manual contains detailed instructions for the use, installation, and start-up of the PFC. Read the manual carefully before installation. For information on using the PFC, the manual should be kept close at hand and consulted before carrying out any operation on the PFC. This PFC has been designed and manufactured in accordance with the standards for the product, for normal use and for all uses that may reasonably be expected.
Page 5: Table Of Contents
Table of Contents Safety Warnings ............................iii 1. General Description ..........................1 1.1 Layout ............................1 1.2 Components ........................... 4 2 Safety Instructions ..........................5 3. Installation ............................5 3.1 Placement of the CT ........................6 3.2 CT Connection..........................7 3.3 Connection to Utility ........................
Page 6 Figures Figure 1 – Standard NEMA 1 Floor Mount Single Enclosure ..............1 Figure 2 – Standard NEMA 1 Floor Mount Double Enclosure ..............2 Figure 3 – Standard NEMA 1 Floor Mount Triple Enclosure ..............2 Figure 4 – Standard Wall Mount (Mini) Enclosure ..................3 Figure 5 –...
Page 7: General Description
1. General Description The StacoVAR system is designed to be used in low voltage (208-600vac), 3-phase, 60 Hz networks; and is a complete system, which is capable of automatically connecting and disconnecting the capacitor banks by means of switching devices (electro-mechanical) under the supervision of the Power Quality Controller (PQC).
Page 8: Figure 2 - Standard Nema 1 Floor Mount Double Enclosure
Figure 2 – Standard NEMA 1 Floor Mount Double Enclosure Figure 3 – Standard NEMA 1 Floor Mount Triple Enclosure Page | 2...
Page 9: Figure 4 - Standard Wall Mount (Mini) Enclosure
Figure 4 – Standard Wall Mount (Mini) Enclosure Figure 5 – Large Wall Mount (Mini) Enclosure Page | 3...
Page 10: Components
Figure 6 – Standard Floor Mount (Mini) Enclosure 1.2 Components Module Assembly (Enclosure) - Steel modular trays are located inside the enclosure. Each module will contain components such as power capacitors, switching devices, reactors (PFH models only), fusing and electrical bus bars. Modules will be installed in a vertical fashion, as required, to accommodate total kVAR requirements.
Page 11: Safety Instructions
Switching Devices/Fuses/Blown Fuse Indication - The operation of the capacitors is conducted by means of motor load contactors, which are suitable for the connection of capacitors. Protection against short-circuits are assured using a set of three NH-00 or NH-000, gRL, 200kaic fuses (one per phase) for each capacitor step in the PFA and PFH models.
Page 12: Placement Of The Ct
Appropriate personnel shall start-up and operate equipment upon installation approval. 3.1 Placement of the CT The StacoVAR must be connected so that it can sample the current of one phase and the voltage between the other two phases. The monitored voltage is derived inside the unit between phase L2 and L3 (the central pole and the one to the right of the main busbars);...
Page 13: Ct Connection
Figure 7 – Recommended CT Placement 3.2 CT Connection When working with CTs, the secondary (terminals on the unit or wires from the unit) must either be shorted together or properly connected to the intended load (e.g., controller). An open circuit CT secondary may develop lethal voltage (this precaution is not required if the bus or cable through the CT is not energized).
Page 14: Connection To Utility
75°C minimum copper leads of the proper gauge. If the unit does not have the optional circuit breaker, a disconnect device (switch or circuit • breaker) must be installed between the StacoVAR and the power system per NEC requirements. 4. PQC Operation 4.1 User Interface The five keys displayed below are used to operate the power quality controller (PQC).
Page 15: Password Protection
4.2 Password Protection The PQC uses a password to prevent sensitive menu items from being accessed by unauthorized persons. Main menu > Configuration • Security level 1, Password: last four digits of the serial number (see label on PQC or About PQC menu.
Page 16: Alarm Contact
The CT parameter will need to be adjusted on start-up. 5.1. Start-Up Apply utility power to the StacoVAR system. Enter the System Parameter menu by selecting enter in the main menu. Navigate to Configuration and select System parameters. The CT ratio must be updated to the ratio of the installed CT.
Page 17: Display Operation
‘Terminate identification’ is displayed. 6. Display Operation All measurements and settings can be displayed from the main menu of the StacoVAR power quality controller. The main menu is comprised of three main groups: Display, Configuration, and About PQC. Figure 10 – Menu Tree...
Page 18: Display Menus
6.1 Display Menus All readings and parameters relevant to the power factor correction are shown. The main Display menu items are: Measurement readings relevant to power factor correction System and PQ Network and power quality parameters Service Status display Alarms & Notifications Display of momentary alarms and the alarm history 6.1.1 PFC menu This menu contains three submenus: Overview, Utilization, and Switching Outputs.
Page 19: System & Pq
2. Main menu > Display > PFC > Utilization Utilization - The ratio of the momentary switched-in capacitance to the total available capacitance, expressed as a percentage. Overcurrent -This parameter is the ratio Irms / I50Hz,60Hz i.e., the theoretically determined ratio of the momentary RMS current to the fundamental current in the capacitor.
Page 20 2. Main menu > Display > System & PQ > THD Display of THDv and THDi and their magnitudes as percentages of the fundamental H1 Single phase PQC: display of Lx and Ix 3. Main menu > Display > System & PQ > V/I harmonics Display of percentage values of the voltage and current harmonics together with the fundamental values for voltage and current.
Page 21: Alarms
7. Alarms The alarm relay (See section 4.4 Alarm Contact) can be activated as NO (closes when active alarm occurs) or NC (opens when active alarm occurs). To set the alarm contact navigate to the Configuration menu and select Alarms. Main menu >...
Page 22: List Of Alarms
Alarm signal via Modbus If the PQC has the Modbus communications interface (RTU or TCP), the alarm register can be • read for all existing alarms. Please refer to the Modbus Specification for further information 7.2 List of Alarms 7.2.1 Cos φ alarm The PQC gives a cos φ...
Page 23: Overcurrent
7.2.5 Overcurrent Overcurrent is the theoretically determined ratio of the momentary RMS current to the fundamental current in the capacitor (Irms / I50Hz,60Hz). It therefore indicates how great the proportion of harmonic currents is compared to the fundamental current. The tuning factor p of the power factor correction system is also considered in this theoretical calculation.
Page 24: Manual Control
If the PQC is provided with the optional Modbus (RTU/TCP) interface, the associated event counter readings (L1–L2–L3) and thus the number of short-term voltage sags (10ms) can be acquired and analyzed. Sensitivity limit 50% to 93% (in increments of 1%) Voltage sag value as % (100% corresponds to Vnom) 50% = not sensitive, 93% = highly sensitive •...
Page 25: Service Menus
9. Service Menus 9.1 Reset Alarm History To reset all alarm history select: MenuConfigurationService Reset Alarm History 9.2 Clear Switching counter A switching cycle counter may only be reset after the corresponding contactor has been replaced. Reset switching cycle counters for all steps to zero. To set individual step counters the service password is necessary.
Page 26 Alarm limit Alarm relay Zero stage detection Display Emergency trip Alarm limit Alarm relay THDi Display Emergency trip Alarm limit 110% Alarm relay Overvoltage Display Emergency trip Harmonic Alarm Order limit % Alarm limit V Harmonic’s 0.43 0.41 1.76 Alarm relay Display Emergency trip Alarm limit...
Page 27: Maintenance
11. Maintenance The StacoVAR power factor correction system is designed and produced to last, even in the most severe service conditions. It is an electronic power unit, which requires periodic maintenance. Some components have a limited lifespan and as such must be periodically checked and replaced should conditions.
Page 28 Special testing, site surveys, or engineering required. • Spare parts required. • Maintenance should be performed on StacoVAR equipment, along with panelboard, switchboard, • switchgear, motor control centers and other electrical power distribution equipment for optimum and efficient operation. Page | 22...
Page 29: Specifications
12. Specifications StacoVAR Specifications Voltage Ratings 240-600VAC ; Control power 120VAC derived internal kVAR Ratings 25-2400kVAR Agency cUL 508A See Specification Drawings for detailed voltage, current, and dimension ratings PQC Technical Specifications Supply Voltage 85–530 V AC (absolute limits), frequency 45–65 Hz, or 100–750 V DC (absolute limits) Aux Power Supply 500 V AC, 70 °C...
Page 30: Troubleshooting
Check the PQC programming and change if set too high. No steps are switched in necessary. when StacoVAR is in Another current measuring automatic mode and pF instrument (e.g. an requires correction.. All measuring instruments in the current path ammeter) has been must always be connected in series.
Page 31: Table 3 - Troubleshooting
The PQC has detected Because of an unstable kVAR loss one or more steps whose network, the StacoVAR has nominal power has fallen. Deactivate the kVAR loss detection function. mistakenly detected a loss of capacitance. Short-time voltage black-...