TAGADOD FOR SOLAR ENERGY
OCT 14 ST. Sana'a, Republic of Yemen 
info@tagadod.net
+9671411113
august-20-2024 

Dear
Good day, and thank you for the quotation.
I would also like to inquire about the possibility of providing us with a Medium Voltage Compact Skid/Station (Inverter duty transformer) in addition to the step-up transformers. Could you please share more details or a quotation for this as well, based on the information provided in the attached documents?
Looking forward to your prompt response.
Best regards,
Jamal Mohammed Alward
Medium Voltage Compact Skid/Station (Inverter duty transformer)
Supply, Install , test, and commission of Medium Voltage Compact Skid with the following minimum specifications:
-        Shall be Pre-Engineered, factory-assembled , factory-Commissioned and Tested 
-        All components of the skid shall be manufactured, assembled, commissioned, tested by a reputable manufacturer;
-        The Only installations work required by CTR one site is to drop in place and plug with inverts and MV power cables
-        The skid shall include the following main components:
1•        2 x AC parallel combiners Units to connect Solar inverters 
              o        Number of Inverters in parallel: >= 5 inverters with capacity of (320kW-350KW) each. 
              o        Type of protection: MCCBs, 250A
              o        Over voltage protection: SPD Type 1+2 
              o        Output Breaker: ACB 1600A, 900V
              o        IP67
              o        certifications shall be : UL 1741, CSA
2 •        Busway, 2x2000A
3 •        Inverter duty transformer 
              o        2500kVA
              o         0.8/3.6 kV 
              o         Dy11y11 
              o         winding material: copper
              o         K-rated 
              o        Altitude: 2280m
              o        The transformer shall be manufactured according to IEEE C57.159/ IEC 60076
4•        MV switchgear (RMU) ring main unit
             o        Type: Outdoor Vacuum insulated
             o        Rated Voltage: 3.6kV
             o        Rated Current: 1250A
             o        Configuration: Double feeder, double incomer, Motorised operation, Vacuum circuit breaker
             o        to be equipped with instrumentation measurement to integrate with the SCADA system
             o       Voltage tester, Voltage tester
             o       Certifications required: IEC publications IEC 60265, IEC 60129, IEC 60056, IEC 60420, IEC 60694, and IEC 60298.
5•        Auxiliary Service Board
             o        Auxiliary Transformer 800 / 400-230 V, 15kVA Dyn11
             o        Low Voltage panel , IP 67, 6 outgoing literals 
             o        UPS, 10kVA, Online type. 
             o        Communication:
                      •        2x Remote I/O module, Digital signals, Input, 8-channel, 2-conductor connection
                      •        1x Remote I/O fieldbus coupler, Modbus/TCP
                      •        1x Network switch, unmanaged, Fast Ethernet
6•       (P&C) Centralized protection and Control for compact skid substation
IP54, humidity range (non-condensing) 0 – 95 %
                      •        IED connectivity capability
                      •       Operating altitude 2300 m
                      •       Communication: Standard: RS485, Ethernet, Optical fiber, Modbus, CANBUS
                      •        the system shall meet the requirement of 3.6KV and 3 MVA size
                      •        All components are type-tested. Compliance with standards: IEC 60076, IEC 62271, IEC 61439.
                      •        Vector group:
                      •        Transformer protection
                      •        Oil-temperature, oil-level, oil-Pressure
                      •        Relay protection:  50 / 51, 50N / 51N
                      •        ACB specification: 3200 A / 380Vac ~ 800 Vac / 3P, 1 pcs
                      •        MCCB specification: 250 A / 380Vac ~ 800 Vac / 3P, 14 pcs
SCADA & PPC System 
Supply, Installation, Commissioning and Testing of Power Plant Control System (PPC) that is able to autonomisly control the operation of PV Generators, four Diesel Generators and Public Grid. The PPC system shall enable effecient use of energy, maximise the output from PV plant, minimize Diesel fuel consumption, maitain minimum diesel generator loading without comprimizing  grid stability.  
• 5-year warrant
The system shall include, but not limited to:
       # Microgrid controller with local HMI;
       # Diesel Generators Controllers;
       # All instrumentation (CTs, PTs, Smart meters, Controllers...etc) required to operate, control and monitor the following:
                       * PV generator ( On-Grid inverters working in parallel up to 16 Units)
                       * Two diesel Generators, 400V;
                       * Two diesel Generators, 3.3kV;
                       * Public Grid, 3.3kV;
       # All devices required for Cloud Data logging (data logger, routers,...)
       # All requied wirings, including control cables, network gears, and fiber optics cables and converters ( if required);
       # PPV SCADA licens shall include Remote Client Support, SCADA Server with local operator interface, History Data Logging, Max Real-time points number, KPI Calculation
The PPC shall be compatible with the load shedding system
The PPC system shall support integration with SCADA system
The PPC System shall support PV Plant up to 5MW.
The system shall support the following functions:
           * Active power Control;
           * Ramp rate limiting;
           * Reactive power control;
           * Power factor control;
           * Voltage control;
           * Power frequency control;
           * Process Data Exchange;
a) Number of Generation Stations: min. 10 units
b) Overall Number of Inverters: min. 20 units
c) Number of monitored points per inverter: min. 110 points
d) Number of monitored points per GS (average), excluding the monitored string currents: min. 280
e) Substation main breaker number: min. 2 points
f) Substation Feeder (incoming) line number: min. 20 feeder
g) Overall number of monitored points for electrical substation (Grid Connection): min. 200
h) Number of weather stations: min. 1 unit
i) Number of field solar radiation: min. 3
j) Number of field PV module temperature:min.  3
k) Overall number of monitored points of weather condition: min. 12
l) Number of CB per inverter (average): min. 9
m) Number of monitored points per CBs per inverter, excluding the monitored string currents: min. 25
n) Number of monitored string current measur. per inverter (average) : min. 144
o) Overall number of string current measurements: 1000
p) Overall number of monitored points for all CBs: 1000
q) Max number of TCP/IP connections: 25
● Supply, install, test and commission of High-Level,local-plant  SCADA system for the following areas: 
-Substation, Swutchgear Bay Room, lighting control panel at free field area, Control panel of Water Tank for PV- Cleaning, and CCR.
● This shall be including all hardware, software, RTUs, meters, sensors, PLCs, ethernet switches,  HMIs, telemetry equipment I/O modules, interface modules, serial ports, UPS units, patch panel, wiring, connections, accessories, boxes and all required items to integrate with PPC system. Spare part 10% of protective equipment such as circuit breakers, fuses
Communication Protocols: The controller shall support Hart protocol and at least one of the following industry standard protocols: Modbus, Ethernet TCP/IP, Profibus,DNP3 
All are to be in compliance with the following standards:-
• CAN/CSA 22.2 No. 61010-1-12 and CAN/CSA 22.2 No. 61010-2-201
• IEC 61850
• UL 61010-1 and UL 61010-2-201
• IEC/EN 61131-2
• for HMIs: ANSI/ISA-101.01-2015
minimum functions are:-
A) The SCADA shall acquire data from main devices in the PV power plant as follows:
1. 3.6kV bay for each incomer, outgoing, and bus section cubical:
Analog Signals:
● ABCN amps (magnitude and phases angle),●  Active Power ●  Reactive Power ●  Power Factor, etc. 
status Signals: of Secondary equipment status
●  Alarm and protection signal, etc.
2. MV transformers (Protection Signals. Only):
●  Oil/Winding temperature alarm o Oil/Winding temperature trip o Pressure trip o Buchholz alarm o Buchholz trip
3. RMU panel:
●  Voltage, current, active power, reactive power, frequency, power factor, etc.
●  Status and alarm signal of switchgear such as circuit breaker, load break switch, and earthing switch.
● Relay protection signals
4. Weather station:
●  Global horizontal irradiance (GHI) ●  Plane of the array irradiance (POA) o Ambient temperature  ●  PV Panel temperature
●  Wind direction and wind speed ●  Humidity ●  Rain ●  Atmospheric pressure, etc.
5. Lighting control unit
●  Voltage, current, active power, reactive power, frequency, power factor, etc.
●  Status and alarm
6. Fire and Gas system
●  Status of Fire and Protection control panel
● Prussur of vessels
7. Fuel tanks (including existing central tanks and the 2 new tanks inside the substation)
8. Water tank for cleaning system
● Water level
● Main flow meter readings
Supply, install, test and commission one Server:
The server must have the features but not limited to the following:
I. Windows Server of latest version.
II. Dual ْXeon CPU quad-core or /Thread ripper/Ryzen 9.
III. GeForce RTX 4070 GPU compatible with OpenGL 3.2 and 2 GB RAM.
IV. Hard disk: 512GB SSD and 2 TB HDD.
V. Very Large projects (1000 - 2000 images at 14 MP): 16 GB RAM, 120
VI. GB SSD Free Space.
VII. MySQL for database.
VIII. Gigabit dual Ethernet port.
IX. Dual power supply.
X. logitech mouse and keyboard
Laser color printer A3 paper size with 5 cartridge sets
● LED curved Screen 55", (2 screens),
● Dual LED  55" Monitor Free-Standing Desk Stand Heavy-Duty Fully Adjustable Arm
GUI screens shall have the following featuers but not limited to:-
Detail pages of plant inverters
• Unifilar graph of the electrical grid/DGs
• Detail pages of string inverters
• PLC detail pages
• Protection relay pages @ 2 substations 
• Measuring tool page
•Trend page, to visualize and compare the moni- tored measurements in the form of linear graphs
• Report page, to show the trend throughout the time, daily values of produced energy
• Page area on the operator’s monitor with the main data
• Power Plant Controller (PPC) page, to show set point values of the active power and power fac-
tor of the system and which allows the operator with the necessary operating rights to be able to
change these settings. 
Supply, install, test and commission a wireless communication system, It shall support the following: -
● min.  6 DG's 
● Grid line
● Network circuit breakers (outgoing transformer/tie feeders/bus couplers)
● min. 10 sheddable loads per busbar (assigned priorities)
● min. 30 sheddable loads or load-shedding groups (connected to all busbars)
Ethernet Cables (UL listed)
Pre-terminated Ethernet cables with RJ45 connectors provide reliable communications for industrial applications. According to TIA/EIA standards