Temperature rise simulation system of power transformer
By designing a power transformer temperature simulation system, a controllable heater and a fan are used to simulate transformer over-temperature faults. This solves the problem of the difficulty in reproducing transformer over-temperature in teaching, achieves safe fault simulation and protection, and improves learning effectiveness.
Patent Information
- Application Number
- CN202522074179.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-26
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2035-09-26
AI Technical Summary
In existing technologies, the simulation of transformer over-temperature faults is difficult to conduct effectively in teaching and practical training, leading to equipment damage and power outages. Moreover, over-temperature faults in actual transformers are uncommon and difficult to reproduce and learn in a short period of time.
A power transformer temperature rise simulation system was designed, including a transformer functional module, a temperature simulation module, a cooling fan circuit, and an over-temperature simulation circuit. The system simulates transformer over-temperature by using a controllable heater and, in conjunction with a fault simulation system, enables fan linkage and alarm signal transmission to simulate transformer over-temperature faults.
It enables controllable simulation of transformer over-temperature faults, and can reproduce over-temperature alarms and linkage protection multiple times, helping students and maintenance personnel to master the use and troubleshooting of transformer temperature controllers, thus avoiding damage to actual equipment and power outages.
Smart Images
Figure CN223566070U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to transformer technical field, concretely is a kind of temperature rise simulation system of power transformer. BACKGROUND
[0002] Transformer is an important equipment of power system, and the principle of transformer is based on electromagnetic induction law, and the voltage transformation is realized by the number of turns ratio, and in the ideal no-load state, the primary and secondary voltage ratio is equal to the number of turns ratio of coil. In power system, the volume of transformer is generally large, and the importance of transformer as industrial or civil power input is self-evident, and it is very important for operation management or maintenance personnel to master relevant knowledge and have corresponding ability. It is particularly important for colleges and universities to train transformer, and the temperature of transformer is a relatively important parameter property. At present, almost all transformers are equipped with temperature controller, so that the current temperature of transformer can be displayed, and the high temperature and over-temperature alarm and trip of transformer can be carried out. The above-mentioned failure of transformer not only damages the transformer, but also causes power supply problem, which has great influence, therefore, the above-mentioned phenomenon will not easily occur in the general transformer. Therefore, it is obviously impractical for colleges and universities to directly use actual transformer to simulate over-temperature for students. CONTENT OF UTILITY MODEL
[0003] In view of the above shortcomings, the utility model aims at providing a temperature rise simulation system for over-temperature fault and over-temperature linkage simulation and learning of power transformer.
[0004] Therefore, the temperature rise simulation system of power transformer of the utility model, including transformer function module, the transformer function module is used to realize transformer function, the transformer function module includes temperature simulation module, and the temperature simulation module is used to simulate the temperature change of three-phase winding of transformer.
[0005] Further, the temperature simulation module includes heat dissipation fan loop and over-temperature simulation loop, and the over-temperature simulation loop is used to improve the temperature of transformer function module, and the heat dissipation fan loop is used for heat dissipation.
[0006] Further, the transformer function module further includes transformer temperature controller, over-temperature simulation button, alarm silencing button, power module and working power loop and control loop.
[0007] Further, the control loop further includes control power loop, alarm silencing loop, door opening signal loop, transformer function module power loop.
[0008] Further, it further includes transformer temperature control and transformer temperature controller working power loop.
[0009] Further, the temperature simulation module comprises a temperature riser.
[0010] Further, a fault simulation system is further included, which is linked with the temperature simulation module, the transformer temperature controller and the protection device.
[0011] Further, the fault simulation system can further provide fan fault, door opening alarm and over-temperature fault simulation.
[0012] Further, a transformer temperature controller panel is included, which comprises LED signal indicator, digital tube display screen and function button; when the temperature of any phase in the transformer three-phase line package exceeds the alarm setting value, the over-temperature LED lamp is always on; when the temperature of any phase in the transformer three-phase line package does not exceed the alarm setting value, the over-temperature LED lamp is off; when the temperature of any phase in the transformer three-phase line package exceeds the tripping setting value, the tripping LED lamp is always on.
[0013] The beneficial technical effects of the utility model are as follows:
[0014] The temperature simulation module is used for simulating the running temperature change of the transformer three-phase winding, and the transformer function module can simulate the function of the voltage transformer. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is a schematic view of the transformer function module;
[0016] Figure 2 It is an internal electrical diagram of the transformer function module (the controller is provided with a buzzer);
[0017] Figure 3 It is a control loop schematic view of the transformer function module;
[0018] Figure 4 The schematic diagram of the temperature controller, the over-temperature simulation button and the alarm silencing button.
[0019] Mark 1, temperature controller; 101, temperature controller panel; 2, over-temperature simulation button; 3, alarm silencing button; 4, cabinet door; 5, transformer function module. DETAILED DESCRIPTION
[0020] In order to further illustrate the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the specific implementation, structure, features and effects according to the utility model are described in detail as follows in combination with the drawings and preferred embodiments.
[0021] Referring to Figures 1 to 3 The utility model discloses a kind of temperature rise simulation systems of power transformer, including transformer function module, transformer function module is used to realize transformer function, and transformer function module includes temperature simulation module, and the temperature simulation module is used to simulate the temperature change of transformer three-phase winding operation.
[0022] The power after boosting needs to pass through transformer step-down to enter industrial or civil equipment, and the transformer function module of the embodiment is actually simulating the step-down transformer entering user end, specifically the dry-type transformer below 10kv, which is a transformer without using oil for cooling, usually adopting air cooling. In the working process of the transformer, eddy current is generated in the core of three-phase coil winding, and heat is generated. The transformer needs to run continuously to ensure power supply, so the heat of the transformer is generated continuously. Normally, when the temperature of the transformer rises, the cooling fan in the transformer will start. When the heat generated by the transformer and the heat cooled by the fan are equivalent, the temperature of the transformer will generally remain stable. The opening temperature of the general industrial dry-type transformer can reach more than 150℃, and the abnormal temperature rise caused by fault will damage the transformer. The transformer function module of the embodiment needs to simulate the real transformer to be close to the actual teaching, with the corresponding functions of the real transformer. Therefore, the cooling fan in the transformer function module needs to balance the heat generated in the transformer. It is difficult for the transformer to appear over-temperature fault in teaching. If the cooling capacity is artificially limited, although over-temperature phenomenon can occur, the teaching time will be limited, and the transformer may be damaged, so there are many shortcomings. If the cooling capacity of the real transformer is maintained, according to the purpose of teaching and practical training, the transformer is generally turned on for a short time and does not run continuously like a normal transformer, so it is difficult to reach the over-temperature level in a short time.
[0023] In this embodiment, the inventors break the inherent thought because in the prior art, when the temperature of the transformer reaches the normal working range, the transformer will not be considered to be heated, because the transformer generates a large amount of heat, and further heating is harmful, at this time, it is usually considered how to efficiently dissipate heat to maintain the temperature from rising, and the embodiment increases a controllable over-temperature simulation circuit to realize over-temperature simulation by artificial heating. Specifically, the transformer function module is composed of a transformer temperature controller 1, an over-temperature simulation button 2, an alarm silencing button 3, a transformer function module 5, a power supply air switch, a power supply module, a fuse terminal, a voltage terminal, and the like. As shown in Figure 4 the transformer temperature controller 1, the over-temperature simulation button 2, and the alarm silencing button 3 are installed on the cabinet door 4, and the transformer function module is installed in the cabinet partition. The temperature simulation module includes an over-temperature simulation circuit, and the over-temperature simulation circuit includes a temperature riser and an over-temperature simulation button. The temperature riser adopts an electric heater, and the alarm adopts sound or sound and light. The alarm includes a buzzer. When the over-temperature simulation button is pressed, the heater heats to the set temperature, the buzzer emits a piercing alarm sound, over-temperature simulation is realized, and the buzzer can be turned off by pressing the alarm silencing button. The over-temperature generated in the transformer function module in this embodiment is used for simulation. The transformer function module is a transformer semi-physical simulation system, that is, the principle of the transformer is adopted, the corresponding component size is reduced for assembly, the components still include three-phase coil winding, iron core, and the like, the key electrical characteristics and functional logic of the transformer in the power distribution system are completely reproduced, and modular design is adopted. Students have a deep understanding of the transformer in the low-voltage power distribution system. The over-temperature of the actual transformer is caused by transformer failure, which may cause damage to the transformer, and the over-temperature in this embodiment is increased by the heater, which is not directly derived from the fault. Controllable and appropriate temperature rise will not damage the transformer function module, but can repeatedly reproduce the alarm and linkage of the simulation transformer over-temperature fault, which is consistent with the actual situation, thereby achieving the purpose of teaching and practical training. The circuit of this embodiment is a closed circuit for realizing corresponding functions, which normally includes a power supply, a switch or a button, functional components, and connecting wires. Functional components such as heat dissipation fans or electric heaters, and the power supply may be different power supplies according to the actual needs of the circuit, such as AC power for the working power supply of the transformer and DC power for the control circuit. The voltage is also different according to the actual situation, such as 380v of three-phase AC power and 12 or 24v of DC power. The internal principle diagram of the transformer function module is shown in Figure 2 Since this embodiment includes a large number of circuits, the principles are all prior art, and for the sake of simple expression, the following will not be described one by one.
[0024] In the above embodiment, the circuit principle of the transformer function module includes: the transformer function module control circuit mainly realizes the control of the transformer function module, such as Figure 3 As shown, it is composed of a control power supply circuit, an alarm silencing circuit, a transformer temperature controller working power supply circuit, a door opening signal circuit, a cooling fan circuit, a transformer function module power supply circuit, and a transformer over-temperature simulation circuit. The control power supply circuit uses AC 220V power supply. When the cabinet door is opened, the door opening signal circuit is closed, the transformer temperature controller buzzer is powered to alarm, and the alarm silencing button 3 can be used to silence the alarm. Pressing the SB2 alarm silencing self-locking button, KA1 relay loses power, the 2,5 contacts of KA1 relay are disconnected, the door opening signal circuit is disconnected, the transformer temperature controller alarm buzzer stops working, and the alarm sound is eliminated. The 1,9 contacts of KA1 relay are closed, and LED2 indicator light is on to provide alarm silencing button setting. The transformer temperature controller working power supply uses AC 220V power supply. When the cabinet door is closed and the alarm silencing button is not set, KA1 relay is powered, the 2,5 contacts of KA1 relay are closed, and SQ2 limit switch normally closed point is opened. When the cabinet door is opened, the SQ2 limit switch normally closed point is reset and closed, and the transformer temperature controller receives the door opening signal and the alarm buzzer operates. When the transformer temperature controller detects that the winding temperature exceeds the set value, the fan starts to work, the contact is closed, and the cooling fan is powered on. The transformer function module power supply circuit uses AC 220V power supply. Pressing the SB1 over-temperature simulation self-locking button, FZT1 transformer function module temperature riser works, and LED1 indicator light is on to indicate that the over-temperature simulation is started. The transformer function module is mainly used to simulate the functional characteristics of 10kV dry-type transformer, which can simulate the running temperature change of three-phase winding of dry-type transformer, the start-stop of winding cooling fan, and the winding over-temperature linkage function. The internal control principle of the transformer function module mainly includes: working power supply circuit, cooling fan circuit, and over-temperature simulation circuit, as shown in Figure 2 .
[0025] In the above embodiment, the main device and parameters include: transformer temperature controller, working power supply: AC 170V-AC 250V, working frequency: 50Hz, power consumption less than 10VA, support communication: Modbus RTU, power failure data query function, press the query key after power failure to display A, B, C three wire package temperature in turn, can display three-phase wire package temperature, can switch to display the highest phase temperature in three-phase wire package. With light button, rated working voltage: AC 220V; rated insulation voltage: AC 415V; rated working current: 4.5A, reset mode: self-locking, contact resistance: ≤50mΩ, combination mode: modular. Transformer function module, mainly used for simulating the electrical characteristics of dry-type transformers, connected with high-voltage distribution module and low-voltage distribution system, receiving power and transmitting energy to low-voltage distribution system; built-in temperature module and cooling fan, simulating transformer over-temperature and fan linkage; providing door opening trigger signal, and transmitting corresponding alarm signal to microcomputer protection device, conducting transformer protection linkage experiment, installation mode: wall-mounted; rated voltage: AC 400V; rated insulation voltage: AC 690V; rated current: 22A; frequency: 50 / 60Hz; DC 110V power module, providing DC 110V power supply for control loop and signal loop, and providing working power supply for microcomputer protection device, installation mode: wall-mounted, input voltage: AC 220V, rated power: 50W, output voltage: DC 110V. DC 24V power module, providing DC 24V power supply for digital power operation and maintenance system hardware, installation mode: guide rail type, input voltage: AC 220V, rated power: 120W, output voltage: DC 24V; power switch, power module protection switch, installation mode: guide rail type, rated voltage: AC 220V, rated current: 10A, breaking capacity: 6kA, trip characteristic: C.
[0026] In the above embodiment, the fault simulation system can also provide fan failure, door opening alarm, and over-temperature fault simulation. The transformer temperature controller panel 101 includes LED signal indicator, nixie tube display screen, and function keys; if the temperature of any phase in the transformer three-phase wire package exceeds the alarm setting value, the over-temperature LED lamp is always on. If the temperature of any phase in the transformer three-phase wire package does not exceed the alarm setting value, the over-temperature LED lamp is off; if the temperature of any phase in the transformer three-phase wire package exceeds the trip setting value, the trip LED lamp is always on. During the practice, the transformer temperature controller off-fan temperature, on-fan temperature, over-temperature alarm temperature, and over-temperature trip temperature are set to the factory values, i.e. off-fan temperature 80℃, on-fan temperature 100℃, over-temperature alarm temperature 130℃, and over-temperature trip temperature 150℃. Cooperating with the transformer function module, the door opening alarm function and the control of the cooling fan by the transformer temperature change can be tested, and the operation of the transformer temperature controller under the transformer over-temperature industrial scenario can also be tested.
[0027] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, equivalent change and modification of the above embodiments, which does not depart from the technical solution of the present application, and which is based on the technical essence of the present application, still belongs to the scope of the technical solution of the present application.
Claims
1. A temperature rise simulation system for a power transformer, characterized by: The transformer function module is used to realize transformer function, and the temperature simulation module is used to simulate transformer three-phase winding operation temperature change.
2. The temperature rise simulation system of a power transformer according to claim 1, characterized in that: The temperature simulation module includes a heat dissipation fan circuit and an over-temperature simulation circuit, the over-temperature simulation circuit includes a power module, an over-temperature simulation button, a temperature riser and connected wires, the over-temperature simulation circuit is used to increase the temperature of the transformer function module, and the heat dissipation fan circuit is used for heat dissipation.
3. The temperature rise simulation system of a power transformer according to claim 2, characterized in that: The transformer function module further includes a transformer temperature controller, an alarm silencing button, a power module, a working power circuit and a control circuit.
4. The temperature rise simulation system of a power transformer according to claim 3, characterized in that: The control circuit further includes a control power circuit, an alarm silencing circuit, a door opening signal circuit and a transformer function module power circuit.
5. The temperature rise simulation system of a power transformer according to claim 4, characterized in that: The transformer temperature control and the transformer temperature controller working power circuit are further included.
6. A temperature rise simulation system for a power transformer according to any one of claims 2 to 5, characterized in that: The temperature riser is an electric heater.
7. The temperature rise simulation system of a power transformer according to claim 4 or 5, characterized in that: The fault simulation system is further included, the fault simulation system is linked with the temperature simulation module, the transformer temperature controller and a protection device, the temperature simulation module can simulate transformer over-temperature and fan linkage start-stop, and can transmit an alarm signal to a microcomputer protection device for linkage protection.
8. The temperature rise simulation system of a power transformer according to claim 7, characterized in that: The fault simulation system can further provide fan fault, door opening alarm and over-temperature fault simulation.
9. The temperature rise simulation system of a power transformer according to claim 7, characterized in that: The transformer temperature controller panel includes LED signal indicator lights, a digital tube display screen and function buttons, when the temperature of any phase of the transformer three-phase line package exceeds an alarm setting value, the over-temperature LED light is always on, when the temperature of any phase of the transformer three-phase line package does not exceed the alarm setting value, the over-temperature LED light is off, and when the temperature of any phase of the transformer three-phase line package exceeds a tripping setting value, the tripping LED light is always on.