A high-temperature detection alarm circuit for ship transformers

Abstract

This utility model discloses a high-temperature detection and alarm circuit for a ship transformer, belonging to the technical field of ship transformers. It includes an overheat detection unit, the input of which is connected to the output of the ship transformer. The overheat detection unit is used to detect the temperature of the ship transformer. The output of the overheat detection unit is connected to the input of an alarm unit, which issues an alarm when the ship transformer temperature is high. The overheat detection unit includes current transformers CT1 and CT2. The input of current transformer CT1 is connected to the output of L3 of the ship transformer, and the output of current transformer CT1 is connected to the input of current transformer CT2. The input of current transformer CT2 is also connected to the output of L2 of the ship transformer. Current transformers CT1 and CT2 are used to obtain the AC current of the ship transformer. This utility model uses an LED D3 to emit light, and simultaneously the alarm sounds, prompting the operator to take timely cooling measures as the transformer temperature is too high.

Description

Technical Field

[0001] This utility model belongs to the field of marine transformer technology, specifically relating to a high-temperature detection alarm circuit for marine transformers. Background Technology

[0002] Marine transformers are electrical equipment used on ships. With the increasing size of ships and the application of electric propulsion, the frequency of transformer malfunctions in marine electrical systems has changed significantly. In recent years, the number of ships using AC high-voltage power systems has been increasing, and ship specifications typically recommend a nominal system voltage of 3-15kV for ship AC high-voltage systems. Transformer cooling methods mainly include natural cooling or forced air cooling, oil immersion cooling, and contact forced cooling. However, as the continuous operating time of the transformer increases, no matter what cooling method is used, it is impossible to completely dissipate the generated heat. This leads to continuous heat accumulation, causing the transformer temperature to exceed the normal range, ultimately causing machine or equipment failure. Therefore, there is an urgent need for transformer temperature detection circuits to monitor the transformer temperature in real time. Utility Model Content

[0003] Purpose of this utility model: To provide a high-temperature detection and alarm circuit for ship transformers, which solves the above-mentioned problems existing in the prior art.

[0004] Technical Solution: A high-temperature detection alarm circuit for a ship transformer includes an overheat detection unit. The input terminal of the overheat detection unit is connected to the output terminal of the ship transformer. The overheat detection unit is used to detect the temperature of the ship transformer. The output terminal of the overheat detection unit is connected to the input terminal of an alarm unit. The alarm unit is used to issue an alarm when the ship transformer temperature is high. The overheat detection unit includes a current transformer CT1 and a current transformer CT2. The input terminal of current transformer CT1 is connected to the output terminal of L3 of the ship transformer. The output terminal of current transformer CT1 is connected to the input terminal of current transformer CT2. The input terminal of current transformer CT2 is also connected to the output terminal of L2 of the ship transformer. The current transformers CT1 and CT2 are used to obtain the AC current of the ship transformer.

[0005] Preferably, the overheat detection unit further includes a diode D1, a resistor R2, a capacitor C1, and an amplifier OP. The positive terminal of the diode D1 is connected to the output terminal of the current transformer CT2. One end of the resistor R2 is connected to the negative terminal of the diode D1. One end of the capacitor C1 is connected to the input terminal of the current transformer CT1. The other end of the capacitor C1 is connected to both the other end of the resistor R2 and pin 2 of the amplifier OP. The capacitor C1, diode D1, and resistor R2 form a rectifier filter sub-circuit.

[0006] Preferably, the overheat detection unit further includes an adjusting resistor RT1, a diode D2, a light-emitting diode D3, a transistor Q1, and a transistor Q2. One end of the adjusting resistor RT1 is connected to the input terminal of the current transformer CT1, and the other end of the adjusting resistor RT1 is simultaneously connected to resistor R3 and pin 1 of amplifier OP. Pin 4 of amplifier OP is connected to the collector of transistor Q2, and pin 3 of amplifier OP is connected to the base of transistor Q1 through a resistor. Pin 3 of amplifier OP is also connected to the anode of diode D2. The collector of transistor Q1 is connected to the base of transistor Q2. The emitters of transistor Q1 and transistor Q2 are connected to the input terminal of the alarm unit. The cathode of diode D2 is connected to the anode of light-emitting diode D3, and the cathode of light-emitting diode D3 is connected to one end of adjusting resistor RT1 and pin 5 of amplifier OP.

[0007] Preferably, the amplifier OP is an operational amplifier of type μA741, the diode D1 is a diode of type 1N4001, the diode D2 is a diode of type IN4148, the transistor Q1 is a transistor of type 3AX81, and the transistor Q2 is a transistor of type 3DG12.

[0008] Preferably, the alarm unit includes capacitor C3, capacitor C4, transistor Q3, transistor Q4, capacitor C5, transformer T1, and buzzer. One end of capacitor C3 is connected to the output terminal of the overheat detection unit and pin 5 of the transformer via resistor R5. One end of capacitor C4 is connected to the output terminal of the overheat detection unit and pin 5 of the transformer via resistor R6. One end of capacitor C3 is connected to the base of transistor Q4. The other end of capacitor C3 is simultaneously connected to the collector of transistor Q3, one end of capacitor C5, and pin 1 of transformer T1. One end of capacitor C4 is connected to the base of transistor Q3. The other end of capacitor C4 is simultaneously connected to the collector of transistor Q4, the other end of capacitor C5, and pin 3 of transformer T1. The emitter of transistor Q4 is connected to the output terminal of the overvoltage detection unit.

[0009] Preferably, transistor Q3 is a 3DG27 type transistor, and transistor Q4 is a 3DG27c type transistor.

[0010] Beneficial Effects: This utility model relates to a high-temperature detection and alarm circuit for ship transformers. It utilizes current transformers CT1 and CT2 to acquire the AC current of the ship transformer. A filter sub-circuit is formed by diode D1, resistor R2, and capacitor C1 to filter the acquired AC current. The filtered AC current is compared with the voltage at pin 3 of amplifier OP. When the voltage at pin 3 of amplifier OP is greater than the filtered voltage, transistors Q1, Q2, Q3, and Q4 conduct. At this time, LED D3 illuminates, and the alarm sounds, alerting the operator that the transformer temperature is too high and prompting timely cooling measures, effectively preventing malfunctions caused by excessively high ship transformer temperatures. Attached Figure Description

[0011] Figure 1 This is the overall circuit diagram of this utility model. Detailed Implementation

[0012] like Figure 1 As shown, this utility model provides a technical solution: a high-temperature detection alarm circuit for a ship transformer, including an overheat detection unit. The input terminal of the overheat detection unit is connected to the output terminal of the ship transformer. The overheat detection unit is used to detect the temperature of the ship transformer. The output terminal of the overheat detection unit is connected to the input terminal of an alarm unit. The alarm unit is used to issue an alarm when the ship transformer temperature is high. The overheat detection unit includes a current transformer CT1 and a current transformer CT2. The input terminal of the current transformer CT1 is connected to the output terminal of L3 of the ship transformer. The output terminal of the current transformer CT1 is connected to the input terminal of the current transformer CT2. The input terminal of the current transformer CT2 is also connected to the output terminal of L2 of the ship transformer. The current transformers CT1 and CT2 are used to obtain the AC current of the ship transformer.

[0013] In a further embodiment, the overheat detection unit further includes a diode D1, a resistor R2, a capacitor C1, an amplifier OP, an adjusting resistor RT1, a diode D2, a light-emitting diode D3, a transistor Q1, and a transistor Q2. The amplifier OP is a μA741 operational amplifier, the diode D1 is a 1N4001 diode, the diode Q2 is an IN4148 diode, the transistor Q1 is a 3AX81 transistor, the adjusting resistor RT1 is a positive temperature coefficient adjusting resistor installed in the marine transformer oil, and its resistance increases with the increase of oil temperature, the transistor Q2 is a 3DG12 transistor, the anode of the diode D1 is connected to the output terminal of the current transformer CT2, one end of the resistor R2 is connected to the cathode of the diode D1, one end of the capacitor C1 is connected to the input terminal of the current transformer CT1, and the other end of the capacitor C1 is connected to both the other end of the resistor R2 and pin 2 of the amplifier OP. The capacitor C1, diode D1, and resistor R2 form a rectifier. The filter circuit includes an operational amplifier OP with one end of the regulating resistor RT1 connected to the input of the current transformer CT1, and the other end connected to both resistor R3 and pin 1 of the amplifier OP. Pin 4 of the amplifier OP is connected to the collector of transistor Q2, and pin 3 of the amplifier OP is connected to the base of transistor Q1 via a resistor. Pin 3 of the amplifier OP is also connected to the anode of diode D2. The collector of transistor Q1 is connected to the base of transistor Q2. The emitters of transistors Q1 and Q2 are connected to the input of the alarm unit. The cathode of diode D2 is connected to the anode of LED D3, and the cathode of LED D3 is connected to one end of the regulating resistor RT1 and pin 5 of the amplifier OP. The voltage output of resistor R2 is compared with the voltage output of regulating resistor RT1. When the output voltage of regulating resistor RT1 is higher than the output voltage of resistor R2, pin 3 of the operational amplifier OP outputs a high potential, and transistors Q1 and Q2 conduct, sending an alarm signal to the alarm unit.

[0014] In a further embodiment, the alarm unit includes capacitor C3, capacitor C4, transistor Q3, transistor Q4, capacitor C5, transformer T1, and buzzer. Transistor Q3 is a 3DG27 type transistor, and transistor Q4 is a 3DG27c type transistor. One end of capacitor C3 is connected to the output terminal of the overheat detection unit and pin 5 of the transformer via resistor R5. One end of capacitor C4 is connected to the output terminal of the overheat detection unit and pin 5 of the transformer via resistor R6. One end of capacitor C3 is connected to the base of transistor Q4, and the other end of capacitor C3 is simultaneously connected to… Connect the collector of transistor Q3, one end of capacitor C5, and pin 1 of transformer T1. One end of capacitor C4 is connected to the base of transistor Q3, and the other end of capacitor C4 is connected to the collector of transistor Q4, the other end of capacitor C5, and pin 3 of transformer T1. The emitter of transistor Q4 is connected to the output of the overvoltage detection unit. When the alarm unit receives current, the voltage at the ports of resistors R5 and R6 is higher than the voltage at the end of resistor R4. At this time, transistors Q3 and Q4 are turned on. Under the current adjustment of transformer T1, the alarm sounds, indicating that the ship's transformer temperature is too high.

[0015] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A marine transformer high temperature detection alarm circuit, characterized in that, The system includes an overheat detection unit, the input of which is connected to the output of the ship's transformer. The overheat detection unit is used to detect the temperature of the ship's transformer. The output of the overheat detection unit is connected to the input of an alarm unit, which issues an alarm when the ship's transformer temperature is high. The overheat detection unit includes current transformers CT1 and CT2. The input of current transformer CT1 is connected to the output of the ship's transformer L3, and the output of current transformer CT1 is connected to the input of current transformer CT2. The input of current transformer CT2 is also connected to the output of the ship's transformer L2. Current transformers CT1 and CT2 are used to obtain the alternating current of the ship's transformer.

2. A marine transformer high temperature detection alarm circuit according to claim 1, characterized in that, The overheat detection unit also includes a diode D1, a resistor R2, a capacitor C1, and an amplifier OP. The positive terminal of the diode D1 is connected to the output terminal of the current transformer CT2. One end of the resistor R2 is connected to the negative terminal of the diode D1. One end of the capacitor C1 is connected to the input terminal of the current transformer CT1. The other end of the capacitor C1 is connected to the other end of the resistor R2 and pin 2 of the amplifier OP. The capacitor C1, diode D1, and resistor R2 form a rectifier filter sub-circuit.

3. A marine transformer high temperature detection alarm circuit according to claim 2, characterized in that, The overheat detection unit also includes an adjusting resistor RT1, a diode D2, a light-emitting diode D3, a transistor Q1, and a transistor Q2. One end of the adjusting resistor RT1 is connected to the input terminal of the current transformer CT1, and the other end of the adjusting resistor RT1 is connected to both resistor R3 and pin 1 of amplifier OP. Pin 4 of amplifier OP is connected to the collector of transistor Q2, and pin 3 of amplifier OP is connected to the base of transistor Q1 through a resistor. Pin 3 of amplifier OP is also connected to the anode of diode D2. The collector of transistor Q1 is connected to the base of transistor Q2. The emitters of transistor Q1 and transistor Q2 are connected to the input terminal of the alarm unit. The cathode of diode D2 is connected to the anode of light-emitting diode D3, and the cathode of light-emitting diode D3 is connected to one end of adjusting resistor RT1 and pin 5 of amplifier OP.

4. The high temperature detection and alarm circuit for a marine transformer according to claim 3, wherein The amplifier OP is an operational amplifier of type μA741, the diode D1 is a diode of type 1N4001, the diode D2 is a diode of type IN4148, the transistor Q1 is a transistor of type 3AX81, and the transistor Q2 is a transistor of type 3DG12.

5. The marine transformer high temperature detection alarm circuit according to claim 1, characterized in that, The alarm unit includes capacitor C3, capacitor C4, transistors Q3 and Q4, capacitor C5, transformer T1, and a buzzer. One end of capacitor C3 is connected to the output of the overheat detection unit and pin 5 of the transformer via resistor R5. One end of capacitor C4 is connected to the output of the overheat detection unit and pin 5 of the transformer via resistor R6. One end of capacitor C3 is connected to the base of transistor Q4, and the other end of capacitor C3 is simultaneously connected to the collector of transistor Q3, one end of capacitor C5, and pin 1 of transformer T1. One end of capacitor C4 is connected to the base of transistor Q3, and the other end of capacitor C4 is simultaneously connected to the collector of transistor Q4, the other end of capacitor C5, and pin 3 of transformer T1. The emitter of transistor Q4 is connected to the output of the overvoltage detection unit.

6. A marine transformer high temperature detection alarm circuit according to claim 5, characterized in that, Transistor Q3 is a 3DG27 type transistor, and transistor Q4 is a 3DG27c type transistor.

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