Cable temperature detection circuit for box-type transformer

Abstract

The utility model discloses a cable temperature detection circuit for a box-type transformer. The cable temperature detection circuit comprises a control chip, a communication circuit and a cable temperature detection circuit, wherein the control chip is respectively connected with the communication circuit and the cable temperature detection circuit, and the communication circuit is used for remote communication; the cable temperature detection circuit is used for cable temperature detection; the cable temperature detection circuit comprises an NTC temperature sensor J1, an operational amplifier U2, a capacitor C60, a capacitor C61, a resistor R54 and a resistor R64. The temperature control circuit comprises a control chip, a communication circuit and a cable temperature detection circuit, and the cable temperature detection circuit comprises an NTC temperature sensor J1, an operational amplifier U2, a capacitor C60, a capacitor C61, a resistor R54 and a resistor R64. The cable temperature detection device is used for cable temperature detection, the NTC temperature sensor J1 converts the cable temperature into an electric signal, and after the electric signal is processed by the operational amplifier U2 and other elements, the cable temperature can be accurately detected.

Description

TECHNICAL FIELD

[0001] The utility model belongs to transformer equipment safety technical field, concretely is a kind of cable temperature detection circuit for box-type transformer. BACKGROUND

[0002] Box-type transformer is an electrical equipment used in power distribution system, usually installed in outdoor or indoor metal cabinet. Box-type transformer usually includes transformer, switching device, protection device and control device components, to transform the voltage of high-voltage power system into the voltage required by low-voltage power system for user use.

[0003] In prior art, for example, the utility model patent with publication number CN215221508U records the technical scheme: a transformer room temperature alarm automatic cooling device, measures the temperature in transformer room by temperature sensor, transmits temperature signal to temperature controller through cable, temperature controller detects and judges temperature, when detecting temperature exceeds preset high temperature value, temperature controller starts exhaust fan to ventilate and cool down, and starts alarm to alarm and prompt. When detecting temperature is lower than preset value, temperature controller delays 1 minute to stop alarm and exhaust fan operation.

[0004] The scheme in prior art is to monitor transformer interior, without directly monitoring transformer cable, and heat change in transformer interior is less sensitive than that of cable, so that monitoring device in prior art cannot timely find abnormal cable temperature condition in transformer interior, so that measures cannot be taken in time to avoid accident. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of cable temperature detection circuit for box-type transformer, to solve the problem that monitoring device in prior art cannot timely find abnormal cable temperature condition in transformer interior, so that measures cannot be taken in time to avoid accident in the background art.

[0006] To solve the above technical problems, the technical scheme adopted by the utility model is:

[0007] A kind of cable temperature detection circuit for box-type transformer, including control chip, communication circuit and cable temperature detection circuit;Wherein control chip is connected with communication circuit and cable temperature detection circuit respectively, communication circuit is used for remote communication;Cable temperature detection circuit is used for the cable temperature detection of transformer;

[0008] Cable temperature detection circuit includes NTC temperature sensor J1, operational amplifier U2, capacitor C60, capacitor C61, resistance R54 and resistance R64;

[0009] The No.1 pin of the NTC temperature sensor J1 is connected with one end of the resistor R64 and the No.1 pin of the operational amplifier U2 respectively; the other end of the resistor R64 is connected with the power supply; the No.3 pin of the operational amplifier U2 is connected with the No.4 pin of the operational amplifier U2, the resistor R54 and one end of the capacitor C60 respectively;

[0010] The other end of the resistor R54 is connected with the signal input end and one end of the capacitor C61 respectively, and the other end of the capacitor C61 is connected with the other end of the capacitor C60 and the No.2 pin of the operational amplifier U2 respectively;

[0011] The other end of the capacitor C61, the other end of the capacitor C60 and the No.2 pin of the operational amplifier U2 are grounded.

[0012] According to the above technical scheme, the control chip adopts the HT6019 chip.

[0013] According to the above technical scheme, the cable temperature detection circuit further comprises a voltage stabilizing circuit, the voltage stabilizing circuit is used for voltage supply of the cable temperature detection circuit, and the voltage stabilizing circuit comprises a first voltage stabilizing circuit and a second voltage stabilizing circuit.

[0014] According to the above technical scheme, the first voltage stabilizing circuit comprises a voltage stabilizer U5, a capacitor C82, a capacitor C44 and a capacitor C46.

[0015] The No.1 pin of the voltage stabilizer U5 is grounded; the No.2 pin of the voltage stabilizer U5 is connected with the power supply, one end of the capacitor C44 and one end of the capacitor C46 respectively; the other end of the capacitor C44 is connected with the other end of the capacitor C46 and one end of the capacitor C82 respectively.

[0016] The other end of the capacitor C82 is connected with the No.3 pin of the voltage stabilizer U5, and the No.3 pin of the voltage stabilizer U5 is further connected with the power supply.

[0017] According to the above technical scheme, the capacitor C46, the capacitor C44 and the capacitor C82 are grounded.

[0018] According to the above technical scheme, the second voltage stabilizing circuit comprises a voltage stabilizer U11, a capacitor C83, a capacitor C84 and a capacitor C85.

[0019] The No.1 pin of the voltage stabilizer U11 is grounded; the No.2 pin of the voltage stabilizer U11 is connected with the power supply, one end of the capacitor C84 and one end of the capacitor C85 respectively; the other end of the capacitor C84 is connected with the other end of the capacitor C85 and one end of the capacitor C83 respectively.

[0020] The other end of the capacitor C83 is connected with the No.3 pin of the voltage stabilizer U11, and the No.3 pin of the voltage stabilizer U11 is further connected with the power supply.

[0021] According to the technical scheme, the capacitor C84, the capacitor C85 and the capacitor C83 are grounded.

[0022] According to the technical scheme, the power supply circuit comprises the interface J3, the resistor RV1, a power module, the capacitor C73 and the capacitor C74.

[0023] The No. 2 pin of the interface J3 is connected with one end of the resistor RV1 and the No. 4 pin of the power module respectively; the No. 1 pin of the interface J3 is connected with the other end of the resistor RV1 and the No. 3 pin of the power module respectively.

[0024] The No. 1 pin of the power module is connected with the power supply, the capacitor C73 and one end of the capacitor C74 respectively; the No. 2 pin of the power module is connected with the other end of the capacitor C73 and the capacitor C74 respectively.

[0025] Compared with the prior art, the utility model has the advantages of the following beneficial effects:

[0026] In the utility model, this box -type transformer cable temperature detection circuit scheme includes control chip, communication circuit and cable temperature detection circuit, wherein the cable temperature detection circuit includes NTC temperature sensor J1, operational amplifier U2, capacitor C60, capacitor C61, resistor R54 and resistor R64. The role of circuit is used for cable temperature detection, and NTC temperature sensor J1 converts cable temperature information into electric signal, can realize accurate detection to transformer cable temperature after the processing of operational amplifier U2 and other elements. The existence of control chip and communication circuit can realize remote communication, and the working state of transformer is monitored and managed conveniently. Overall, this circuit scheme can effectively monitor the temperature of box -type transformer cable and realize remote communication, and it is helpful to discover problems in time and handle. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is box -type transformer cable temperature detection circuit diagram of the utility model;

[0028] Figure 2 It is the first voltage stabilizing circuit diagram of the utility model;

[0029] Figure 3 It is the second voltage stabilizing circuit diagram of the utility model;

[0030] Figure 4 It is power supply circuit diagram of the utility model;

[0031] Figure 5 It is communication circuit diagram of the utility model;

[0032] Figure 6 It is control chip circuit of the utility model. DETAILED DESCRIPTION

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Example 1

[0035] like Figure 1 As shown, a cable temperature detection circuit for a box-type transformer is provided. The cable temperature detection circuit includes an NTC temperature sensor J1, an operational amplifier U2, a capacitor C60, a capacitor C61, a resistor R54, and a resistor R64.

[0036] Pin 1 of NTC temperature sensor J1 is connected to one end of resistor R64 and pin 1 of operational amplifier U2; the other end of resistor R64 is connected to the power supply; pin 3 of operational amplifier U2 is connected to pin 4 of operational amplifier U2, resistor R54 and one end of capacitor C60.

[0037] The other end of resistor R54 is connected to the signal input terminal and one end of capacitor C61, and the other end of capacitor C61 is connected to the other end of capacitor C60 and pin 2 of operational amplifier U2.

[0038] The other end of capacitor C61, the other end of capacitor C60, and pin 2 of operational amplifier U2 are all grounded.

[0039] This utility model discloses a cable temperature detection circuit for a box-type transformer, comprising a control chip, a communication circuit, and a cable temperature detection circuit. The cable temperature detection circuit includes an NTC temperature sensor J1, an operational amplifier U2, capacitors C60 and C61, and resistors R54 and R64. The circuit's function is to detect cable temperature. The NTC temperature sensor J1 converts the cable temperature information into an electrical signal, which, after processing by the operational amplifier U2 and other components, enables accurate detection of the transformer cable temperature. The control chip and communication circuit allow for remote communication, facilitating monitoring and management of the transformer's operating status. Overall, this circuit scheme effectively monitors the cable temperature of the box-type transformer and enables remote communication, helping to promptly identify and address problems.

[0040] Example 2

[0041] This embodiment is a further refinement of Embodiment 1.

[0042] The control chip used is the HT6019 chip.

[0043] The cable temperature detection circuit further comprises a voltage stabilizing circuit for voltage stabilization of the cable temperature detection circuit, and the voltage stabilizing circuit comprises a first voltage stabilizing circuit and a second voltage stabilizing circuit.

[0044] As shown in Figure 2 , the first voltage stabilizing circuit comprises a voltage stabilizer U5, a capacitor C82, a capacitor C44 and a capacitor C46.

[0045] The No. 1 pin of the voltage stabilizer U5 is grounded; the No. 2 pin of the voltage stabilizer U5 is connected with a power supply, one end of the capacitor C44 and one end of the capacitor C46 respectively; the other end of the capacitor C44 is connected with the other end of the capacitor C46 and one end of the capacitor C82 respectively;

[0046] The other end of the capacitor C82 is connected with the No. 3 pin of the voltage stabilizer U5, and the No. 3 pin of the voltage stabilizer U5 is further connected with the power supply.

[0047] The capacitor C46, the capacitor C44 and the capacitor C82 are all grounded.

[0048] As shown in Figure 3 , the second voltage stabilizing circuit comprises a voltage stabilizer U11, a capacitor C83, a capacitor C84 and a capacitor C85.

[0049] The No. 1 pin of the voltage stabilizer U11 is grounded; the No. 2 pin of the voltage stabilizer U11 is connected with a power supply, one end of the capacitor C84 and one end of the capacitor C85 respectively; the other end of the capacitor C84 is connected with the other end of the capacitor C85 and one end of the capacitor C83 respectively;

[0050] The other end of the capacitor C83 is connected with the No. 3 pin of the voltage stabilizer U11, and the No. 3 pin of the voltage stabilizer U11 is further connected with the power supply.

[0051] The capacitor C84, the capacitor C85 and the capacitor C83 are all grounded.

[0052] Further comprising a power supply circuit, as shown in Figure 4 , the power supply circuit comprises an interface J3, a resistor RV1, a power supply module, a capacitor C73 and a capacitor C74.

[0053] The No. 2 pin of the interface J3 is connected with one end of the resistor RV1 and the No. 4 pin of the power supply module respectively; the No. 1 pin of the interface J3 is connected with the other end of the resistor RV1 and the No. 3 pin of the power supply module respectively;

[0054] The No. 1 pin of the power supply module is connected with a power supply, one end of the capacitor C73 and one end of the capacitor C74 respectively; the No. 2 pin of the power supply module is connected with the other end of the capacitor C73 and the other end of the capacitor C74 respectively.

[0055] The working principle of the utility model is as follows:

[0056] At the outlet of the transformer cable, the NTC temperature sensor is attached tightly to the cable. The NTC temperature sensor signal is connected to pin J1 of this invention via a lead. The NTC temperature sensor is a negative temperature characteristic resistor, and its resistance decreases as the temperature rises. The NTC temperature sensor and R64 form a series voltage divider circuit, and the divided voltage signal serves as the signal input to amplifier U2.

[0057] To ensure accurate temperature measurement, a dedicated 1.2V voltage regulator circuit is used in the voltage divider circuit.

[0058] U2 is used as a follower circuit to increase the input impedance of the AD sensor and improve detection accuracy.

[0059] The output signal from U2 enters the AD sampling channel of the main control chip U3 (e.g., Figure 6 As shown, U3 contains a 12-bit ADC. The temperature analog signal is converted into a digital signal after being converted by the ADC.

[0060] After acquiring the temperature digital signal, U3 sends the data to the background monitoring unit through the RS485 communication circuit to provide data support for subsequent decision-making.

[0061] Example 3

[0062] A cable temperature detection circuit for a box-type transformer also includes an external communication circuit.

[0063] like Figure 5 As shown, the external communication circuit includes: RS485 communication chip U18, pin J4, resistor R80, resistor R82, and transistor Q6; pin 6 of chip U18 is connected to pin 1 of pin J4, and pin 7 of chip U18 is connected to pin 2 of pin J4; pin 1 of chip U18 is connected to pin 21 of chip U3; pin 2 of chip U18 is connected to pin 3 of chip U18, one end of resistor R82, and the collector of transistor Q6; the other end of resistor R82 is connected to pin 4 of chip U18; the emitter of transistor Q6 is connected to the power supply; the base of transistor Q6 is connected to one end of resistor R80, and the other end of resistor R80 is connected to pin 22 of U3.

[0064] It should be noted that the relational terms herein, such as first and second, and the like, are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual 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.

[0065] Finally, it should be noted that the above-described embodiments are merely possible embodiments of the present application, and thus are not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can still be modified or equivalent replaced by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cable temperature detection circuit for a tank transformer, characterized by: The control chip, the communication circuit and the cable temperature detection circuit are connected with each other, the communication circuit is used for remote communication, and the cable temperature detection circuit is used for detecting the cable temperature of the transformer. The cable temperature detection circuit comprises an NTC temperature sensor J1, an operational amplifier U2, a capacitor C60, a capacitor C61, a resistor R54 and a resistor R64. The first pin of the NTC temperature sensor J1 is connected with one end of the resistor R64 and the first pin of the operational amplifier U2; the other end of the resistor R64 is connected with a power supply; the third pin of the operational amplifier U2 is connected with the fourth pin of the operational amplifier U2, the resistor R54 and one end of the capacitor C60. The other end of the resistor R54 is connected with a signal input end and one end of the capacitor C61; the other end of the capacitor C61 is connected with the other end of the capacitor C60 and the second pin of the operational amplifier U2. The other end of the capacitor C61, the other end of the capacitor C60 and the second pin of the operational amplifier U2 are grounded.

2. The cable temperature detection circuit for a box-type transformer according to claim 1, characterized by: The control chip is an HT6019 chip.

3. The cable temperature detection circuit for a box-type transformer according to claim 1, characterized by: The cable temperature detection circuit further comprises a voltage stabilizing circuit, which is used for voltage supply of the cable temperature detection circuit, and the voltage stabilizing circuit comprises a first voltage stabilizing circuit and a second voltage stabilizing circuit.

4. The cable temperature detection circuit for a box-type transformer according to claim 3, characterized by: The first voltage stabilizing circuit comprises a voltage stabilizer U5, a capacitor C82, a capacitor C44 and a capacitor C46. The first pin of the voltage stabilizer U5 is grounded; the second pin of the voltage stabilizer U5 is connected with a power supply, one end of the capacitor C44 and one end of the capacitor C46; the other end of the capacitor C44 is connected with the other end of the capacitor C46 and one end of the capacitor C82. The other end of the capacitor C82 is connected with the third pin of the voltage stabilizer U5, and the third pin of the voltage stabilizer U5 is further connected with the power supply.

5. The cable temperature detection circuit for a box-type transformer according to claim 4, characterized by: The capacitor C46, the capacitor C44 and the capacitor C82 are grounded.

6. The cable temperature detection circuit for a box-type transformer according to claim 3, characterized by: The second voltage stabilizing circuit comprises a voltage stabilizer U11, a capacitor C83, a capacitor C84 and a capacitor C85. The first pin of the voltage stabilizer U11 is grounded; the second pin of the voltage stabilizer U11 is connected with a power supply, one end of the capacitor C84 and one end of the capacitor C85; the other end of the capacitor C84 is connected with the other end of the capacitor C85 and one end of the capacitor C83. The other end of the capacitor C83 is connected with the third pin of the voltage stabilizer U11, and the third pin of the voltage stabilizer U11 is further connected with the power supply.

7. The cable temperature detection circuit for a box-type transformer according to claim 6, characterized by: The capacitor C84, the capacitor C85 and the capacitor C83 are grounded.

8. The cable temperature detection circuit for a pad-mounted transformer of claim 1, wherein: The power supply circuit comprises an interface J3, a resistor RV1, a power supply module, a capacitor C73 and a capacitor C74. The second pin of the interface J3 is connected with one end of the resistor RV1 and the fourth pin of the power supply module; the first pin of the interface J3 is connected with the other end of the resistor RV1 and the third pin of the power supply module. The first pin of the power supply module is connected with a power supply, one end of the capacitor C73 and one end of the capacitor C74; the second pin of the power supply module is connected with the other end of the capacitor C73 and the other end of the capacitor C74.

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