Detection circuit for oil temperature of box-type transformer

Abstract

The utility model discloses a detection circuit for the oil temperature of a box-type transformer. The detection circuit comprises a chip U1, a chip U9, a sensor U2, a resistor R41, a resistor R42, a resistor R47, a resistor R48, a resistor R50, a resistor R51, a resistor R52, a capacitor C52, a capacitor C54 and a capacitor C55. And a No.7 pin of the chip U1 is connected with the sensor U2. According to the utility model, by connecting the chip U1, the chip U9, the sensor U2 and a series of resistors and capacitors, the oil temperature of the transformer is monitored and detected. A sensor U2 is connected with a resistor R41 and a resistor R42, so that a temperature signal of the oil temperature of the transformer is acquired and processed; through connection of resistors R48, R47, R51 and R52, amplification and filtering processing of signals are realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of electric power overhauling equipment, specifically a detection circuit for the oil temperature of a box-type transformer. BACKGROUND

[0002] A transformer is a core device for power transmission in a power distribution network, and the safe operation of the transformer is directly related to the safety of the power grid. If a transformer fails, it may cause equipment loss, major power outages, or line fire accidents, resulting in significant economic losses. In order to avoid greater harm caused by transformer failure, transformer fault monitoring has become a key to reducing power distribution network failures.

[0003] In the prior art, for example, the patent with publication number CN219996278U describes a technical solution for monitoring the oil tank of a transformer, which includes a double-pressure acquisition unit, an oil temperature acquisition unit, and a microcomputer processing unit. The double-pressure acquisition unit and the oil temperature acquisition unit are connected to the oil tank drain pipe. The double-pressure acquisition unit measures the oil pressure at two measurement points in the oil tank drain pipe. The oil temperature acquisition unit acquires the temperature of the transformer oil in the oil tank drain pipe. The microcomputer processing unit is connected to the double-pressure acquisition unit and the oil temperature acquisition unit.

[0004] The prior art does not mention how to effectively monitor the oil temperature of the transformer, which leads to the problem of not being able to timely detect temperature abnormalities inside the oil tank. INVENTION CONTENTS

[0005] The purpose of the utility model is to provide a detection circuit for the oil temperature of a box-type transformer to solve the problem of not being able to effectively monitor the oil temperature of the transformer, which leads to the problem of not being able to timely detect temperature abnormalities inside the oil tank.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A detection circuit for the oil temperature of a box-type transformer includes a chip U1, a chip U9, a sensor U2, resistors R41, R42, R47, R48, R50, R51, R52, capacitors C52, C54, and C55.

[0008] Pin 7 of chip U1 is connected to sensor U2. Pin 1 of sensor U2 is connected to one end of resistor R41 and resistor R42. The other end of resistor R41 is connected to a power supply, and the other end of resistor R42 is connected to pin 1 of chip U9.

[0009] The pin 2 of the sensor U2 is connected with the resistor R48 and one end of the capacitor C55 respectively; the other end of the resistor R48 is connected with the resistor R47 and one end of the resistor R51 respectively; the other end of the resistor R47 is connected with the pin 3 of the chip U9 and one end of the resistor R52 respectively; the other end of the resistor R51 is connected with the other end of the capacitor C55.

[0010] The other end of the resistor R52 is connected with the resistor R50, one end of the capacitor C54 and the pin 4 of the chip U9 respectively; the other end of the resistor R50 is connected with the other end of the capacitor C54 and one end of the capacitor C52 respectively.

[0011] The other end of the capacitor C52 is connected with the pin 5 of the chip U9.

[0012] According to the technical scheme, the pin 2 of the sensor U2, the resistor R48 and the capacitor C55 are grounded.

[0013] According to the technical scheme, the capacitor C55 and the other end of the resistor R51 are further connected with the power supply.

[0014] According to the technical scheme, the pin 2 of the chip U9 is grounded.

[0015] According to the technical scheme, the capacitor C52, the capacitor C54 and the resistor R50 are grounded.

[0016] According to the technical scheme, the chip U1 is further connected with an external circuit; the external circuit comprises the capacitor C1, the capacitor C2, the capacitor C9, the capacitor C8, the resistor R5 and the resistor R17.

[0017] One end of the capacitor C1 is connected with the pin 2 of the chip U1 and one end of the capacitor C2 respectively; the other end of the capacitor C1 is connected with the other end of the capacitor C2; the other end of the capacitor C1 and the other end of the capacitor C2 are grounded.

[0018] One end of the resistor R5 is connected with the power supply; the other end of the resistor R5 is connected with one end of the capacitor C9, the pin 3 and the pin 4 of the chip U1 respectively; the other end of the capacitor C9 is grounded.

[0019] One end of the capacitor C8 is connected with one end of the resistor R17 and the pin 6 of the chip U1 respectively; the other end of the capacitor C8 is connected with the other end of the resistor R17; the other end of the capacitor C8 and the other end of the resistor R17 are grounded.

[0020] According to the technical scheme, the external circuit further comprises the sensor U3, the resistor R1, the resistor R2, the resistor R3, the capacitor C4, the capacitor C5, the capacitor C15 and the capacitor C16.

[0021] The pin 1 of the sensor U3 is connected with one end of the resistor R2 and the resistor R1 respectively, the other end of the resistor R2 is grounded, the other end of the resistor R1 is connected with one end of the capacitor C4 and the pin 8 of the chip U1 respectively; the other end of the capacitor C4 is grounded;

[0022] The pin 2 of the sensor U3 is grounded;

[0023] One end of the capacitor C5 is connected with one end of the resistor R3 and the pin 9 of the chip U1 respectively; the other end of the capacitor C5 is connected with the other end of the resistor R3, and the other end of the capacitor C5 and the other end of the resistor R3 are both grounded;

[0024] One end of the capacitor C15 is connected with one end of the capacitor C16 and the pin 10 of the chip U1; the other end of the capacitor C15 is connected with the other end of the capacitor C16; the other end of the capacitor C15 and the other end of the capacitor C16 are both grounded.

[0025] According to the above technical scheme, the external circuit further comprises a capacitor C3, a capacitor C7 and a crystal oscillator B1;

[0026] One end of the capacitor C3 is connected with one end of the crystal oscillator B1 and the pin 23 of the chip U1; the other end of the capacitor C23 is connected with one end of the capacitor C7, the other end of the capacitor C7 is connected with the crystal oscillator B1 and the pin 22 of the chip U1 respectively; the capacitor C7 and the capacitor C3 are both grounded.

[0027] Compared with the prior art, the utility model has the following beneficial effects:

[0028] In the utility model, through connecting the chip U1, the chip U9, the sensor U2 and a series of resistors and capacitors, the monitoring and detection of the transformer oil temperature are realized. Through the connection of the sensor U2 and the resistors R41 and R42, the collection and processing of the input signal of the transformer oil temperature are realized; through the connection of the resistors R48, R47, R51 and R52, the amplification and filtering processing of the signal are realized; through the connection of the resistor R50 and the capacitors C54 and C52, the signal is further processed and output to the chip U9 for analysis and judgment. Through the device in the utility model, the transformer oil temperature can be effectively and accurately detected, so that the phenomenon of self-ignition in the transformer is prevented due to the excessively high oil temperature in the transformer. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a data processing circuit schematic view of the utility model;

[0030] Figure 2 It is a data acquisition circuit schematic view of the utility model. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0032] Embodiment one

[0033] As shown in Figure 1 and Figure 2 , a kind of detection circuit for oil temperature of box-type transformer, including chip U1, chip U9, sensor U2, resistance R41, resistance R42, resistance R47, resistance R48, resistance R50, resistance R51, resistance R52, capacitor C52, capacitor C54 and capacitor C55;

[0034] As shown in Figure 1 , the 7th pin of chip U1 is connected with sensor U2;The 1st pin of sensor U2 is connected with one end of resistance R41 and resistance R42 respectively;The other end of resistance R41 is connected with power supply, and the other end of resistance R42 is connected with the 1st pin of chip U9;

[0035] As shown in Figure 2 , the 2nd pin of sensor U2 is connected with one end of resistance R48 and capacitor C55 respectively;The other end of resistance R48 is connected with one end of resistance R47 and resistance R51 respectively;The other end of resistance R47 is connected with the 3rd pin of chip U9 and one end of resistance R52 respectively;The other end of resistance R51 is connected with the other end of capacitor C55;

[0036] The other end of resistance R52 is connected with one end of resistance R50, capacitor C54 and the 4th pin of chip U9 respectively, and the other end of resistance R50 is connected with the other end of capacitor C54 and one end of capacitor C52 respectively;

[0037] The other end of capacitor C52 is connected with the 5th pin of chip U9.

[0038] In the utility model, by connecting chip U1, chip U9, sensor U2 and a series of resistance and capacitor, realize the monitoring and detection to transformer oil temperature.The acquisition and processing of the input signal of transformer oil temperature are realized by the connection of sensor U2 and resistance R41, R42;The amplification and filter processing of signal are realized by the connection of resistance R48, R47, R51, R52;Signal is further processed and output to chip U9 for analysis and judgment by the connection of resistance R50, capacitor C54, C52.

[0039] Embodiment two

[0040] This embodiment is a further refinement of embodiment one.

[0041] As shown, the 2nd pin of sensor U2, resistor R48 and capacitor C55 are all connected to ground. Figure 2

[0042] The other end of capacitor C55 and resistor R51 are also connected to the power supply.

[0043] The 2nd pin of chip U9 is connected to ground.

[0044] Capacitor C52, capacitor C54 and resistor R50 are all connected to ground.

[0045] Chip U1 is also connected to external circuits; the external circuits include capacitor C1, capacitor C2, capacitor C9, capacitor C8, resistor R5 and resistor R17;

[0046] One end of capacitor C1 is connected to the 2nd pin of chip U1 and one end of capacitor C2 respectively; the other end of capacitor C1 is connected to the other end of capacitor C2; both ends of capacitor C1 and capacitor C2 are connected to ground;

[0047] One end of resistor R5 is connected to the power supply, the other end of resistor R5 is connected to one end of capacitor C9, the 3rd pin and the 4th pin of chip U1 respectively; the other end of capacitor C9 is connected to ground;

[0048] One end of capacitor C8 is connected to one end of resistor R17 and the 6th pin of chip U1 respectively; the other end of capacitor C8 is connected to the other end of resistor R17; both ends of capacitor C8 and resistor R17 are connected to ground.

[0049] The external circuits also include sensor U3, resistor R1, resistor R2, resistor R3, capacitor C4, capacitor C5, capacitor C15 and capacitor C16;

[0050] One end of sensor U3 is connected to one end of resistor R2 and resistor R1 respectively, the other end of resistor R2 is connected to ground, the other end of resistor R1 is connected to one end of capacitor C4 and the 8th pin of chip U1 respectively; the other end of capacitor C4 is connected to ground;

[0051] The 2nd pin of sensor U3 is connected to ground;

[0052] One end of capacitor C5 is connected to one end of resistor R3 and the 9th pin of chip U1 respectively; the other end of capacitor C5 is connected to the other end of resistor R3; both ends of capacitor C5 and resistor R3 are connected to ground;

[0053] ​One end of the capacitor C15 is connected with one end of the capacitor C16 and the 10th pin of the chip U1; the other end of the capacitor C15 is connected with the other end of the capacitor C16; the other end of the capacitor C15 and the other end of the capacitor C16 are grounded.

[0054] The external circuit further comprises a capacitor C3, a capacitor C7 and a crystal oscillator B1.

[0055] One end of the capacitor C3 is connected with one end of the crystal oscillator B1 and the 23rd pin of the chip U1; the other end of the capacitor C23 is connected with one end of the capacitor C7, and the other end of the capacitor C7 is connected with the crystal oscillator B1 and the 22nd pin of the chip U1 respectively; the capacitor C7 and the capacitor C3 are grounded.

[0056] The circuit in the utility model is applied to temperature detection of transformer oil in a box transformer, one end of the temperature sensor U3 is arranged in the inside of a transformer oil tank body, the other end inputs the chip U1, the chip U1 processes the temperature of the transformer oil in real time through the sensor U3, when the temperature value reaches a set alarm threshold, the chip U1 sends an alarm signal to a corresponding main control device.

[0057] The technical scheme in the utility model does not relate to improvement of components, and all the components used are prior art devices.

[0058] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0059] Finally, it should be noted that: the above only describes the preferred embodiments of the utility model, and does not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, still can modify the technical scheme recorded in the foregoing embodiments, or equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A detection circuit for oil temperature of a tank transformer, characterized by: Capacitor C52, capacitor C54 and resistor R50 are grounded. Pin 7 of chip U1 is connected with sensor U2; pin 1 of sensor U2 is connected with one end of resistor R41 and resistor R42 respectively; the other end of resistor R41 is connected with power supply, and the other end of resistor R42 is connected with pin 1 of chip U9; Pin 2 of sensor U2 is connected with one end of resistor R48 and capacitor C55 respectively; the other end of resistor R48 is connected with one end of resistor R47 and resistor R51 respectively; the other end of resistor R47 is connected with pin 3 of chip U9 and one end of resistor R52 respectively; the other end of resistor R51 is connected with the other end of capacitor C55; The other end of resistor R52 is connected with one end of resistor R50, capacitor C54 and pin 4 of chip U9 respectively, and the other end of resistor R50 is connected with the other end of capacitor C54 and one end of capacitor C52 respectively; The other end of capacitor C52 is connected with pin 5 of chip U9.

2. The detection circuit for oil temperature of a box-type transformer according to claim 1, characterized by: Pin 2 of sensor U2, resistor R48 and capacitor C55 are grounded.

3. The detection circuit for oil temperature of a box-type transformer according to claim 1, characterized by: The other end of capacitor C55 and resistor R51 is also connected with power supply.

4. The detection circuit for oil temperature of a box-type transformer according to claim 1, characterized by: Pin 2 of chip U9 is grounded.

5. The detection circuit for oil temperature of a box-type transformer according to claim 1, characterized by: Capacitor C52, capacitor C54 and resistor R50 are grounded.

6. The detection circuit for oil temperature of a box-type transformer according to claim 1, characterized by: Chip U1 is also connected with external circuit; the external circuit comprises capacitor C1, capacitor C2, capacitor C9, capacitor C8, resistor R5 and resistor R17; One end of capacitor C1 is connected with pin 2 of chip U1 and one end of capacitor C2 respectively; the other end of capacitor C1 is connected with the other end of capacitor C2; the other end of capacitor C1 and capacitor C2 is grounded. One end of resistor R5 is connected with power supply, and the other end of resistor R5 is connected with one end of capacitor C9, pin 3 and pin 4 of chip U1 respectively; the other end of capacitor C9 is grounded. One end of capacitor C8 is connected with one end of resistor R17 and pin 6 of chip U1 respectively; the other end of capacitor C8 is connected with the other end of resistor R17; the other end of capacitor C8 and the other end of resistor R17 are grounded.

7. A detection circuit for the oil temperature of a box-type transformer according to claim 6, characterized in that: The external circuit further comprises sensor U3, resistor R1, resistor R2, resistor R3, capacitor C4, capacitor C5, capacitor C15 and capacitor C16; Pin 1 of sensor U3 is connected with one end of resistor R2 and resistor R1 respectively, the other end of resistor R2 is grounded, and the other end of resistor R1 is connected with one end of capacitor C4 and pin 8 of chip U1 respectively; the other end of capacitor C4 is grounded. Pin 2 of sensor U3 is grounded. One end of capacitor C5 is connected with one end of resistor R3 and pin 9 of chip U1 respectively; the other end of capacitor C5 is connected with the other end of resistor R3; the other end of capacitor C5 and the other end of resistor R3 are grounded. One end of the capacitor C15 is connected with one end of the capacitor C16 and the 10th pin of the chip U1; the other end of the capacitor C15 is connected with the other end of the capacitor C16; the other end of the capacitor C15 and the other end of the capacitor C16 are grounded.

8. The detection circuit for oil temperature of a box-type transformer according to claim 7, characterized by: The external circuit further comprises a capacitor C3, a capacitor C7 and a crystal oscillator B1; One end of the capacitor C3 is connected with one end of the crystal oscillator B1 and the 23rd pin of the chip U1; the other end of the capacitor C23 is connected with one end of the capacitor C7, and the other end of the capacitor C7 is respectively connected with the crystal oscillator B1 and the 22nd pin of the chip U1; the capacitor C7 and the capacitor C3 are grounded.

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