Khanahmedova S., Alimamedova S., Kerimova S.
LOGICAL ENGINE OVERHEATING PROTECTION PROGRAM *
Аннотация:
the engine overheating protection system's program is presented in this article. The Zelio Soft-2 program's Functional Block Diagram (FBD) language is used to compile the program. In order to protect against current overheating, the method of cutting off the motor from the mains is examined. If necessary, an algorithm that takes into consideration a constant value determined based on the parameters and the engine's cooling status will cause a command to disconnect the engine from the mains. The core building components of the FBD programming language are briefly described. Programs are created both before and after the protection system is activated
Ключевые слова:
Zelio Soft-2, Functional Block Diagram, engine, motor protection, current, analog input
УДК 004.421
Khanahmedova S.
Associate professor of the Department Electromechanics
Azerbaijan State Oil and Industry University
(Baku, Azerbaijan)
Alimamedova S.
Doctoral student of the Department Electromechanics
Azerbaijan State Oil and Industry University
(Baku, Azerbaijan)
Kerimova S.
Doctoral student of the Department Electromechanics
Azerbaijan State Oil and Industry University
(Baku, Azerbaijan)
LOGICAL ENGINE OVERHEATING PROTECTION PROGRAM
Abstract. The engine overheating protection system's program is presented in this article. The Zelio Soft-2 program's Functional Block Diagram (FBD) language is used to compile the program. In order to protect against current overheating, the method of cutting off the motor from the mains is examined. If necessary, an algorithm that takes into consideration a constant value determined based on the parameters and the engine's cooling status will cause a command to disconnect the engine from the mains. The core building components of the FBD programming language are briefly described. Programs are created both before and after the protection system is activated.
Keywords: Zelio Soft-2, Functional Block Diagram, engine, motor protection, current, analog input.
Introduction. It is well known that the windings of the rotor, stator, electrical connection system, etc. can be the cause of engine overheating in a variety of electric machines. An increase in the rated current above the permissible value is the primary cause of engine heating. Gradually raising the rated current above allowable value could put an electric equipment in an emergency state. Therefore, it is required to wait until the stator and rotor temperatures have increased to their limit temperature [1, 2]. Given this, the protective mechanism does not need to immediately disconnect the engine from the mains. Only when a threat exists should the protective system shut off the engine.
Purpose of the work. Motor protection from current cheating is an incorrect form of motor protection that involves monitoring the motor's rated current. The motor is cut off from the mains till the end of the predefined period when the current value exceeds the nominal value and the duration of this process exceeds the nominal value. The motor will continue to operate if the motor current is less than the rated current or equal to it before the aforementioned time period expires.
Protecting the motor from current heating. The protection system program was assembled using the Zelio Soft program and functional blocks of the Functional Block Diagram (FBD) language. The typical method of disconnecting the motor from the mains during the protection against current heating is shown in Figure 1. The figure shows that it takes less time to disconnect the motor from the mains the lower the motor current value from the nominal value [3, 4].
The formula provided below can be solved to get the graph in Fig. 1.
t=K/(I - In),
where t - is the moment the motor is disconnected from the mains, I is its current current, In is its rated current, and K - is a constant dictated by the motor's cooling condition and other factors.
Fig. 1. Illustrates the typical engine shutdown form
Engine protection program. Let's create a program to prevent overheating of the engine. Let's add the current value and the duration of the protection at K=100 and In=25 A to the program. We first activate the Q1 motor using the solitary input I1. By converting the analog signal Ib (0-9.9V), which represents the current value of the motor current per unit of current, the GAIN block imitates a rise in current over the nominal amount (Fig. 2) of current. We note the highest (A), minimum (C), and standard information volume coefficient (B=255) currents in the block's parameters window.
Fig. 2. Parameter of the GAIN block
The ADD/SUB block adds and subtracts incoming signals by using the changeable value of the motor I1's current, which is given to it by the GAIN block. The second analog input designated for addition receives the alternating current signal in accordance with formula (1). Additionally, the third analog input for signal subtraction is coupled to the nominal value of the motor current via the NUM block. To create an algorithm for the equation (I-In), we do as such. Next, you can create the second portion of the formula (1) by executing mathematical operations like multiplication and division using the block MUL/DIV. The first analog input designated for multiplication is connected to the NUM block, which has the value K=100 printed on it. The third analog input of the MUL/DIV block, which is used to divide signals, receives the output signal of the ADD/SUB block. As a result, an algorithm is created for the expression K/(I-In) (Fig. 3).
To calculate the time of disconnecting the engine from the mains in case of overheating, an analog timer of type A/C is used. The resulting value when calculating formula (1) is fed to the first input of this timer Delay setpoint value on – the set value for the on delay. Thus, the compilation of the algorithm for formula (1) is completed. Then, to compare the motor current value with the nominal one, it is necessary to use the COMPARE (Comparison of 2 values) block comparator. If the current value of the current is greater than the nominal value (I>In), then the comparator gives the command to operate the timer. As a result, the first analog input of the comparator receives a reference value equal to the rated current (25 A) of the motor, and the second analog input of this device is wired to the output of the GAIN block.
Fig. 3.
When comparing these signals, the comparator delivers a command to the discrete input of the timer through the logic element AND, which is concurrently connected to the input discrete block I1, if the motor current value exceeds the nominal value. A/C, in turn, is connected to the motor via the NOT and AND logic components in order to switch the motor on and off from the mains once the given Timer time has passed. The ARCHIVE block is initiated in order to start recording the current value, the shutdown time, and the protection operation.
Figure 4,a displays the program before to the protection being triggered, while 4, b displays the protection program following the triggering of the protection.
Fig. 4, a. Protection program before the protection is triggered
Fig. 4, b. The protection program after the protection is triggered
Conclusion. Thus, it is proposed to use the program of the engine overheating protection system compiled by the insert. The process of disconnecting the motor from the mains in the process of protection against overheating by current is analyzed. An algorithm has been compiled for triggering a command to disconnect the engine from the mains if necessary, taking into account a constant value determined depending on the parameters and the cooling condition of the engine.
REFERENCES:
http://electricalschool.info/main/drugoe/379-tokovye-peregruzki-i-ikh-vlijanie-na.html
https://tehprivod.su/poleznaya-informatsiya/sposoby-zashchity-elektrodvigateley.html
Hasanov Z.A., Khanahmedova S.A. “Programmable logic controllers”, Textbook, Vol. II, p.127, Pub.hous ASOIU, Baku, 2016.
Hasanov Z.A., Khanahmedova S.A. “Problems of programmable logic controllers”, Textbook, p.120, Pub.hous ASOIU, Baku, 2021.
Номер журнала Вестник науки №7 (52) том 5
Ссылка для цитирования:
Khanahmedova S., Alimamedova S., Kerimova S. LOGICAL ENGINE OVERHEATING PROTECTION PROGRAM // Вестник науки №7 (52) том 5. С. 83 - 88. 2022 г. ISSN 2712-8849 // Электронный ресурс: https://www.вестник-науки.рф/article/6094 (дата обращения: 26.04.2024 г.)
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