ATS Automatic Transfer Switch is a control system used to convert Load, which is being supplied from the main grid Main Utility to a secondary source using another grid Backup Utility; w
INTRODUCTION
Problem statement
A substation plays a crucial role in transferring power from generating plants to consumers, ensuring reliable electricity supply Common transmission issues include phase loss due to wire breaks, voltage and current fluctuations from overloads or failures, and short circuits These problems can arise in substations or supply lines, often exacerbated by inclement weather or falling trees For critical facilities such as hospitals, government buildings, state banks, and embassies, maintaining a constant power supply is essential to prevent disruptions.
To ensure uninterrupted power supply during outages, it is essential to implement a backup power source that can seamlessly take over when a failure occurs To minimize downtime and mitigate the adverse effects of power loss, an Automatic Transfer Switch (ATS) system is crucial This innovative ATS grid-grid auto-converter design incorporates control and monitoring capabilities via a web server, enhancing efficiency and reliability in power management.
Figure 1 1 Automatic Transfer Switch System
Figure 1 2 Automatic Transfer Switch System
Goals
The "Control and Monitoring ATS System through Webserver" project focuses on designing and implementing a system that enhances productivity, supervision, and control via a web server using LAN technology By constructing this model, we can simulate and optimize parameters, leading to significant advancements in Vietnam's power supply industry.
Project limitation
This project only constructs and reproduces based on ATS System at Power Supply Company in Vietnam, through on internship report in 3rd year university Besides, some
3 implemental parts will not be mentioned in this project including PT (Potential Transformer), Synchroscope/ synch check relay, 2 power source independence, …
This project only uses common controlling methods which are widely used and are capable of implementing Complicated or high demanding methods will not be mentioned.
Research methods
Based on models in practice by researching on the internship report and internet,
I constructed the “Control and Monitoring ATS System through on Webserver” model with the enthusiastic and thoughtful guidance of Advisor Tran Vi Do Ph.D.
Outline
Chapter 2 provides an overview of existing technology and theoretical foundations related to the system Building on these theories and requirements, Chapter 3 focuses on organizing and addressing the system's tasks, including selecting necessary hardware and calculating data such as synchronizing two velocity axes and determining leading distance In Chapter 4, the model is constructed, and the HMI and Web Server are configured using WinCC Unified Chapter 5 presents the results of the model's operation and evaluates its performance based on these outcomes Finally, Chapter 6 concludes the study and offers recommendations for future work.
LITERATURE REVIEW AND OVERVIEW PROCESS
Automatic Transfer Switch problem
The problem of ensuring continuity in a power supply system is a necessary need for daily life, state agencies, especially in industrial production.…
One of the commonly used methods to ensure the aforementioned feature in the power supply is to use the automatic switching system ATS
An Automatic Transfer Switch (ATS) is a crucial control system that seamlessly transitions electrical loads from the primary power source (Main Utility) to a backup power source (Backup Utility) during grid failures, such as power outages, phase failures, or voltage fluctuations Once the main power grid stabilizes, the ATS automatically restores the load to the primary source and disconnects the backup utility, ensuring continuous power supply and enhancing system reliability.
The load conversion from mains power to backup grid functions automatically when the ATS system is set to AUTO mode, while it requires manual control when operated in MANUAL mode.
2.1.1 Overview Automatic Transfer Switch System
An automatic transfer switch (ATS) is an intelligent device designed to automatically manage power switching between two sources Its main function is to guarantee uninterrupted electrical power supply to connected loads, such as lights, motors, and computers.
The automatic transfer switch (ATS) is a microprocessor-based control logic system that continuously monitors the electrical parameters, such as voltage and frequency, of both primary and alternate power sources In the event of a power source failure, the ATS automatically switches the load circuit to the available alternate power source Typically, these switches prioritize connection to the primary power source (utility) by default, only connecting to the alternate source (engine-generator or backup utility) during a primary source failure or upon operator command.
- The normal utility power source fails
A transfer switch automatically or manually shifts the electrical load to an emergency power source, ensuring that power from a generator or backup utility feed is stable and meets specific voltage and frequency tolerances, tailored to the facility's requirements.
A transfer switch automatically or manually switches the load from an emergency power source back to the normal utility power source once it is restored.
Figure 1 3 Grid and Grid ATS System
A variety of arrangements are available utilizing two power sources and three power sources
An emergency standby generator system consists of a standard transfer switch configuration that connects an electric utility service with a generator, providing both normal and emergency power sources This setup may involve multiple engine-generator sets operating in parallel to ensure reliable power supply during outages.
This use case highlights the implementation of two utility sources that enhance redundancy in the distribution system, ensuring rapid service restoration in the event of upstream equipment failures These sources can operate independently, necessitating the public utility company to deliver dual electric services, or they may derive from a single electric service distributed through multiple redundant pathways within the facility.
Figure 1 5 Utility-Utility Figure 1 4 Utility-Generator
Transfer switches are essential for connecting two generator sets for prime power applications, particularly in remote installations where continuous 24/7 power is needed To ensure equal runtime, the source power is alternated periodically between the generator sets.
Critical facilities equipped with an emergency standby generator system typically incorporate a second generator connection to provide redundant backup This additional generator ensures continuous power during inclement weather or while the primary generator undergoes scheduled maintenance.
As shown, in some cases, the first generator is permanently installed onsite whereas the second generator will be a portable roll-up type that is deployed when needed
This configuration enhances redundancy through a dual utility setup and incorporates an emergency standby generator The generator can be assigned to a single transfer switch or utilized by multiple transfer switches using a priority control scheme.
ATS Operation
Manual Transfer initiation and operation are performed manually, typically by pushing a button or moving a handle; initiation occurs locally
Manually initiate a transfer by pressing a button or rotating a switch to cause an internal electromechanical device to electrically operate the switching mechanism; initiation can occur locally or remotely
The transfer switch controller autonomously manages the initiation and operation processes It activates when the automatic controller detects a loss of source power, subsequently operating the switching mechanism to ensure a seamless transition.
Structure of ATS System
The switching mechanism of a transfer switch is crucial as it physically manages the rated electrical current and facilitates the transition of load connections between different power sources.
Contactors are the most common and cost-effective type of switching mechanism, designed as electrically-controlled double-throw switches They operate by opening one set of power contacts while simultaneously closing another, ensuring efficient control of electrical circuits.
Molded case switches are commonly employed to open and close circuits between separable contacts in various conditions, both normal and abnormal These switches are designed with simplicity in mind and can accommodate either a mechanically operated, over-center toggle or a motor operator.
Power frame switches outperform molded case switches in size, speed, and power, with the ability to manage loads of up to 5,000 amps They incorporate a two-step stored energy technology, enabling both manual and electrical operation while under load.
System Overview
ATS System is operated based on:
- Overvoltage/ Undervoltage Relay (OV/UV Protection Relay) when grid is stability
- Rated 230VAC Relay for signal input of PLC
- Rated 24VDC Relay for Controlling Contactor open or close
- Multimeter MFM383A-C RS485 for monitoring the load 1
With those problems mentioned above, we will construct an operating model as follow:
The OV/UV Relay monitors the stability of the voltage input, and when the conditions are optimal, it energizes the relay This action closes the normally open terminal, sending a signal to the PLC for further processing.
The 24VDC relay is designed to control a contactor by receiving input signals from the OV/UV protection relay Once the input is received, the PLC processes the information according to the programmed code and outputs a 24VDC signal to effectively manage the contactor's operation.
- The rated 230VAC Relay for Signal Input and will be displayed on Webserver
Theoretical Basis
With the idea mentioned above, when controlling the contactor through the 24VDC rated relay and received signal from OV/UV Relay, to control right open or close the contactor:
- Check signal from Grid 1 (Utility 1) and Grid 2 (Utility 2)
- When received fully 2 input signals then the PLC will close 2 contactors to give
2 power supply independently for 2 loads independently
When one of the two signals is detected, the PLC activates the contactor on the mains side corresponding to the received signal Subsequently, it engages the intermediary contactor to ensure a continuous power supply for both load 1 and load 2.
Type Of ATS System
An ATS integrated system combines switching mechanisms, interlock mechanisms, control circuits, and protection circuits into a single unit Leading manufacturers in the Vietnamese market include renowned brands like Socomec and Schneider, alongside mid-range options such as Osung, Pesco (Korea), and Chint (China).
- In Vietnam, when talking about integrated ATS (synchronized ATS), we must mention the product lines of Socomec This is a company specializing in the production of control
Figure 2 5 ATS combined with Socomec and schneider
13 and protection equipment, uninterruptible power supply equipment Up to now, Socomec's products are present in more than 70 countries
- Because they only specialize in UPS, Socomec's power converters are equipped with many modern features such as: support for measuring electrical parameters, installation, and editing software via Ethernet, Modbus
Especially Socomec also has a representative office in Vietnam, so users can easily get support when needed
The ATS features a dynamic switching mechanism, interlock, control circuit, and protection circuit all integrated into a single unit, ensuring high synchronization among its components The reliability of self-assembled ATS cabinets is significantly influenced by the designer's expertise in selecting each component and the skill of the individual assembling these components within the cabinet.
The integration of all related components into a single block significantly accelerates the construction and installation time of the power conversion system, thanks to the built-in ATS unit This streamlined design minimizes reliance on the skills and qualifications of the electrical cabinet design and construction team.
- The integrated ATS also has built-in drivers for different cases such as switching from grid to grid; grid with transmitter There are also extended options to support measurement
Figure 2 6 Integrated ATS also has built-in drivers for different cases
14 and monitoring Depending on the needs of the user, it is equipped with the necessary modules
Compact, takes up little installation space:
- Because it is pre-manufactured according to strict technical requirements, the ATS unit is much more compact in size than the self-assembled ATS cabinets
- Composition of the price of 1 set of ATS includes 3 main parts:
1 Cost of equipment (ACB, MCCB, Contactor, interlock, control circuit, protection )
2 Labor costs (cost of cabinet design, cabinet manufacture, installation, writing control programs, testing )
While the upfront cost of integrated ATS may equal or exceed that of discrete component ATS, the overall expenses related to labor—such as design, cabinet manufacturing, installation, programming, inspection, and maintenance—are significantly lower for integrated systems.
- Therefore, for simple power conversion applications, the load capacity is not too large, so ATS should be selected due to the above advantages
Integrated ATS units consist of individual modules, allowing for a swift and convenient replacement and repair process when damage occurs, as only the affected modules need to be replaced.
There is a full range of optional functions according to the individual requirements of the user
- The ATS also has full support for accessories such as:
+ Remote Interface: Used to attach to the electrical cabinet door and connect to the ATS unit with RJ45 network cable to control, display power status, contact status
Figure 2 8 Modules of the ATS unit
Despite such many advantages, integrated ATS also has certain disadvantages
- Only applicable for simple source conversion cases
Auto-adapter power converters are designed for basic power conversion tasks, primarily facilitating the switching between two sources, such as mains and generators or between different grid connections However, synchronized Automatic Transfer Switches (ATS) are not suitable for more complex power conversion scenarios, including configurations involving two mains sources and one backup source, or setups that integrate a grid, bus coupler, and generator.
ATS units are typically designed for applications with a maximum rated current ranging from 1600A to 3200A, with limited capacity for short-circuit breaking current Schneider's ATS units have a maximum rated current of approximately 1600A, while Socomec's ATS series offers a higher capacity of up to 3200A, making them suitable for simple power transfer applications.
Self install ATS Box
- For complex power conversion applications or with too large closing current (>3200A), the ATS unit is not suitable
ATS cabinets will be custom-designed to meet specific requirements, utilizing available components such as MCCB (ACB) with switch motors, mechanical interlocks, and ATS cabinet controllers from various manufacturers, along with necessary protection circuits.
- Popular in Vietnam market are products of manufacturers such as ABB, Merlin Gerin, Siemens, Schneider MCCB & ACB are electrically interlocked to perform automatic switching function
- A complete set of ATS electrical cabinets will include 3 main parts:
+ The dynamic part (the part used to contain Contactor, MCCB and ACB)
+ Controller: using a dedicated controller integrated with ats cabinets (Osung, Socomec ), using logic relays (Logo, Zelio ), using small PLCs (for complex applications)
+ Other parts: such as electromechanical interlock, protection monitoring module, remote communication
Figure 2 11 Self install ATS Box
2.7.1 Advantages of Self install ATS Box
- Highly customizable, can choose many operating modes, high specifications Easy to replace in case of breakdown and maintenance Easily connect to higher-level management systems
2.7.2 Disadvantages of Self install ATS Box
- High cost, takes up space… suitable for demanding applications
- The quality of ATS cabinets depends on the design unit and the workmanship of the constructor
- Long construction and installation time due to having to process and assemble related accessories by themselves
Figure 2 12 Self-assembled ATS cabinets are often used for complex power conversion applications
CALCULATION AND DESIGN
System Design Requirements
According to requirements in Chapter 2, combining with the ATS System in reality, we will figure out some following designing demands:
- There are 2 independent loads from 2 independent sources
- 2 operating modes including automatic and manual
In the event of a grid source failure, whether due to low voltage, high voltage, or complete power loss, the remaining grid source will seamlessly take over and automatically provide power to compensate for the lost source.
- When in automatic mode, and operating under the backup configuration, when the backup power comes back, immediately return 2 power supplies to 2 independent loads
- Manual mode can switch primary and backup power configurations
- Control the system via Web
- Load 1: o Monitor power, current and voltage o Graphs to monitor power o Store electrical parameters o Save changed values
- Notice of ACB (Contactor) maintenance when the number of switching times exceeds the specified number of times, this parameter can be set.
Organize functional blocks in the system
- Mission: This block receives signals, results received from the relay, calculates, programmed commands, plays a role as the system’s CPU
- Include: DSPT Relay, OV/UV Protection Relay o The relay will be sending signal if the voltage is stability, o Buttons from the electric box o The relay after contactor
The PLC will process input signals according to its programmed instructions, generating control signals that operate the relay, enabling the switching on and off of the contactor as per the specified scenario.
Technological process of the system
The system comprises three primary operations: Off Operation, Automatic Operation, and Manual Operation, each designed to perform distinct tasks Off Operations ensure the system is inactive, while Automatic Operations facilitate seamless and consistent functioning Manual Operations allow for user intervention, providing flexibility in managing the system's performance.
In this operation, the system receives a signal from the energized relay, which then sends the signal to the PLC and displays it on the web server for the operator As a result, three contactors will be tripped automatically.
The PLC processes the input signal from the voltage relay to determine which contactor to activate, ensuring the proper operation of the two loads according to the programmed logic.
Figure 3 1 Diagram block ATS System
21 be continuously powered or use 2 power sources to run 2 independent loads (if the input conditions are satisfied) c) Manual Operations:
In this operating state, the PLC only issues the contactor switching command based on the operator without obeying any signal from the input relay
Also in this mode, run only when there is a request from the superior for special purposes or maintenance of the remaining contactor.
Control method selection
In today's market, there are many familiar PLC brands such as Mitsubishi, Omron, Delta, Siemens But PLC Siemens always has strong advantages compared to other brands as follows:
- PLC Siemens is strong in process control and control over communication
- Good flexibility, extensibility: Siemens analog modules are cheaper, simple to use
- There are specialized function blocks that support communication control
- Although Siemens PLC is available in both horizontal and vertical program structures, all PLC programs are still sequentially executed from top to bottom
- Besides, Siemens’ subroutine can support Local variables in order to be used more widely in programming
Siemens PLC is the leading choice for automation solutions, particularly with its S7 series, which includes models such as S7-200, S7-300, S7-1200, and S7-1500 Among these, the S7-1200 stands out due to its superior design, robust security features, and advanced technology.
- Innovative design: compact, module board helps expand the controller easily without changing its physical dimensions
Siemens PLC ensures robust confidentiality by safeguarding against unauthorized modifications and protecting valuable data, which necessitates enhanced operational availability through authorization features The S7-1200 and TIA Portal are designed with integrated access protection, preventing unauthorized access to algorithms and process protection modules.
- Well-equipped: The S7-series supports a variety of communication protocols,
Analog, HSC, PWM/PTO, Profinet…
3.3.2.1 The Over Voltage/ Under Voltage (OV/UV) Protection Relay
In electrical engineering, protective relays are crucial devices that trigger circuit breakers upon detecting faults Initially, these relays were electromagnetic, utilizing coils and moving parts to identify abnormal conditions like over-current, overvoltage, reverse power flow, and frequency fluctuations.
Microprocessor-based solid-state digital protection relays have advanced beyond traditional electromechanical relays by offering enhanced protection and supervision capabilities that were previously impractical While electromechanical relays provide basic fault indication, a single microprocessor relay can perform the functions of multiple electromechanical devices, resulting in significant savings in capital and maintenance costs Despite the rise of digital technology, many electromechanical relays remain in service due to their long lifespan, continuing to safeguard transmission lines and electrical equipment globally Critical transmission lines and generators often feature dedicated protection cubicles housing either numerous electromechanical devices or one to two microprocessor relays.
Understanding the theory and application of protective devices is crucial for power engineers specializing in power system protection Protective relays must respond rapidly, often tripping a breaker within milliseconds to safeguard circuits and equipment In certain cases, legislation or operational guidelines dictate these response times To ensure the reliability and efficiency of protection systems, a comprehensive maintenance and testing program is essential.
As what we mentioned in Chapter 2, we have the signal to display on HMI and need to be make sure the load 1 & 2 have electrical on HMI
Relays function as switches, operating one or more poles that can be activated by energizing the coil Normally open (NO) contacts establish a connection when the relay is activated, while normally closed (NC) contacts disconnect the circuit upon activation The various contact configurations consist of combinations of NO and NC connections, allowing for versatile circuit control.
Hardware
This block includes: PLC plays the role of server, information processing center
• PLC Siemens S7-1215C DC/DC/DC
- Article number: 6ES7215-1AG40-0XB0
- Input current: 500mA CPU only; 1500mA CPU with all expansion modules
- Number of digital I/O: 14 DI, 10 DO, 6 HSC (high speed counter), 4 PTO (pulse train output) 100kHz
- Number of analog I/O: 2 AI with input voltage ranges 0-10VDC, 2 AO with output current ranges 0-20mA
• Besides, this software also supports designing, programming HMI communication via the PLCSIM software I can write programmes via the Tia Portal V17 programming software of Siemens
To supply power for CPU PLC S7-1200, an inverter to convert AC to DC is needed:
• AC-DC Converter, DC Supply for PLC and 24VDC Devices
- Short circuit breaking current: 10kA
• DS202 M AC-C20/0.03 Residual Current Circuit Breaker with Overcurrent Protection
- Rated Short-Circuit Capacity: 6 kA
This block includes: OV/UV Protection Relay, Omron 220VAC Relay
• Voltage protection relay Selec VPRA2M-CE
- Monitors Under Voltage, Over Voltage, Phase Asymmetry,
- LED Indication : Power ON / Phase Failure, Under Voltage, Over Voltage,
- Adjustable Over and Under Voltage Trip Level
Figure 3 6 Voltage protection relay Selec VPRA2M-
• OMRON Intermediate Relays 220VAC - MY4N AC220/240
- Number of Pins: 14 pins, 4 pairs of contacts, with lights, with diodes
Figure 3 7 OMRON Intermediate Relays 220VAC
• OMRON Intermediate Relays 24VDC – MY2N DC24
- Number of Pins: 8 pins, 2 pairs of contacts, with lights, with diodes
Figure 3 8 Relays 24VDC – MY2N DC24
- Large glass relay with 2 poles
- 8 large flat feet, with lights and latching.: 7.5kW
Figure 3 9 IDEC RELAY 24VDC – RU2S-D24
• Chint Contactor NXC-16 16A 7.5kW 1NO+1NC Coil 220VAC
3.4.4 Communication block – RS485 and Multimeter RS458
• Communication RS485 Module – CM 1241 - 6ES7241-1CH32-0XB0
• Multimeter Function Meters RS485 – MFM383A-C
– Meters: V, A Hz, Pf, kW, kVA, kVAr and measure kWh, KVAh, KVArh – Display 3 rows, 4 numbers, LCD format
– 4th row: 8 numbers (for electricity)
– Network connection: 3 phase – 4 wire, 3 phase – 3 wire, 2 phase – 3 wire & 1 phase – 2 wire
– Output: 24VDC pulse / 100mA current
– Setting PT factor Primary: 100V – 10 KV
– Secondary PT Factor setting: 100 – 500V AC (L-L)
• 100A/5A AC current transformers LMK-BH-0.66-30
Design of the ATS System
After choosing all devices, the next part is constructing a hardware model for easily visualizing the whole system and designing suitable working principles
The system is presented as follows:
The Omron Relay MY2N-GS 24VDC is utilized to control three contactors via signals from a PLC Specifically, Relay Control 1 operates Contactor 1 (K1), Relay Control 2 manages Contactor 2 (K2), and Relay Controls 31 and 32 are designated for Contactor K3, which connects K1 and K2 Additionally, Relay Controls 31_E and 32_E, where 'E' signifies Extend, incorporate an electric interlock to prevent simultaneous activation of DC and AC within the same relay, effectively isolating the DC line.
AC line into 2 separate relays (connection by parallel, 31 with 31_E and
Figure 3 16 Block Diagram I/O connect S7-1200 1215 DC/DC/DC
Figure 3 15 Block Diagram output and control
- OV/UV Relay will sending information to the PLC if the Grid Voltage is stability
- Relay Signal will sending information to the PLC if the load stability
Figure 3 18 Block Diagram Communication to PLC
- Multi-function meter MFM383A-C will measure electrical parameters at Load 1 and will transmit to PLC to display on Webserver via CM1241 expansion module by MODBUS RS485 protocol
Figure 3 17 Block Diagram input to PLC
SYSTEM MODEL
Hardware
Next, I will present about how to wire the system’s equipment:
Figure 4.1.1 Wiring between PLC and I/O Devices
Figure 4.1.2 Wiring between PLC and Multifunction Meter MFM383A-
Figure 4 2 Wiring between PLC and Multifunction Meter MFM383A-
Figure 4.1.4 Power Circuit 2 Those images above are presenting how to wire the system’s equipment, we can rely on them to easily arrange and construct the hardware model
Figure 4 5 OV UV Protection Relay
Figure 4 6 OV UV Protection Relay
HMI configuration
Based on the managing parameters and technical requirements outlined in Chapter 2, we have compiled a comprehensive list of essential managing parameters for Human-Machine Interface (HMI).
- Controlling buttons such as Start/Stop
- Select operation mode buttons Auto/ Manual
- Display parameter of Load 1, include Voltage, Current and Power
- 4 Navigation views o Dashboard o Trend views (Load 1) o Change logs (Load 1) o Setting maintenance, counter trip times and alarm maintenance.
Wincc Unified Configuration
Wincc unified configuration is software that allows users to configure the web server to launch SCADA programs on it
Figure 4 10 SIMATIC Runtime Manager SIMATIC Runtime Manager is software that helps us manage Wincc Unified projects
Change logs (Load 1) (Logs only change parameter):
History alarm, Setting and Monitoring trip times of Contactor screen):
After configuring the ATS system using TIA Portal V17 and WinCC Unified software, the system is now ready for operation and control The next step involves running the system to analyze the results effectively.
RESULTS AND EVALUATION
Result
- Stop operation: The multifunction Meter will be turn off, the light of Load 1, Load
Grid 1 Online, Grid 2 Online, Load 1 active, Load 2 active
- The multifunction Meter turns on (from Load 1 active)
Figure 4 17 Grid 1 Online, Grid 2 Online
Grid 1 Online, Grid 2 Offline, Load 1 active, Load 2 active
- The multifunction Meter turns on (from Load 1 active)
Figure 4 18 Grid 1 Online, Grid 2 Offline
Grid 1 Offline, Grid 2 Online Load 1 active, Load 2 active (from Grid 2)
- The multifunction Meter turns on (from Load 1 active)
Figure 4 19 Grid 1 Offline, Grid 2 Online
When we access to the IP of project, we can see this interface:
User management allows us to view information about created accounts and change passwords However, it is essential to log in with an account configured in TIA Portal under the security settings to access these features.
• Wincc unified RT: We must be logged in to operate the system
• Wincc unified help: Make it easy for newbies to understand how to use Wincc Unified
Figure 5 1 Interface of Web Server
Once logged into the system, we will see the following operating screens (stopped system, the red light on stop button)
Figure 5 1 System overview Started system (Green light on Start button)
- The light of button “AUTO” will have blue light (selected AUTO mode)
- 2 buttons “MODE 1” and “MODE 2” will be appeared (Mode 1: Trip 637, Mode 2: Trip 638)
2 sources online independently to 2 loads independently:
- In this case, K3 (600) will be tripped (Green color meaning open circuit (Trip) and Red is for closed circuit)
Grid 1 offline (grey line), 638 (Tripped)
- 637 & 600 (K2 & K3) closed circuit for Load 1, Load 2
Figure 5 3 2 Sources online independently to 2 LOAD independently
Figure 5 4 Grid 1 offline (grey line), 638 (Tripped)
Grid 2 offline (grey line), 637 (Tripped)
- 638 & 600 (K1 & K3) closed circuit for Load 1, Load 2
Figure 5 5 Grid 2 offline (grey line), 637 (Tripped)
- The light of button “MANUAL” will have orange light (selected MANUAL mode)
- 2 buttons “MODE 1” and “MODE 2” will be appeared (Mode 1: Trip 637, Mode 2: Trip 638)
- The button “MODE 1” will have blue light (meaning was actived “MODE 1”)
- 638 & 600 (K1 & K3) closed circuit for Load 1, Load 2
- 637 have the green color on it and be tripped (open circuit)
- The button “MODE 2” will have blue light (meaning was actived “MODE 2”)
- 637 & 600 (K2 & K3) closed circuit for Load 1, Load 2
- 638 have the green color on it and be tripped (open circuit)
Trend view (Monitor parameter of Load 1):
• Log all parameter changes of LOAD 1
• CSV file, can view by Microsoft Excel software
- Filtering monitor value (VOLT, CURRENT, POWER)
Figure 5 10 File CSV Report to Excel
57 Figure 5 11 Filter monitor graph (Current)
Figure 5 12 Filter monitor graph (Power)
58 Figure 5 13 Filter monitor graph (Combine 2 values)
Change logs (Monitor parameter of Load 1):
- Only display when value was changed
• Log all parameter changes of LOAD 1
• CSV file, can view by Microsoft Excel software
- Can setting Alarm for Trip times of Contactor
- Display times Contactor have tripped
- When maintenance the Contactor or replace new Contactor, need to reset tripped times count, the view has 3 buttons: “Reset K1”, “Reset K2”, “Reset K3” to reset counter
Evaluation
Compared to technical requirements mentioned in Chapter 2, as well as results from the operation, I have some records as follow:
- The system operates accurately, durable, and the power supply time is continuous
- There are alerts for Contactor trip times
- Webserver has friendly UI/UX design
- Can monitor the parameters of electricity
- Fast response system, switching indicators and uninterruptible power supply meet TCVN (