Indicating device applied to transformer

Abstract

An indicating device applied to a transformer belongs to the technical field of transformer auxiliary safety equipment, and comprises a voltmeter, a temperature display, a pressure sensor, an electric leakage detection circuit, an oil quantity detection circuit, an approach prompt circuit and an overtemperature detection circuit, the voltmeter, the temperature displayer, the electric leakage detection circuit, the oil quantity detection circuit, the proximity prompt circuit and the overtemperature detection circuit are installed in the element box and electrically connected, an installation groove is formed in one supporting frame of the transformer, and the pressure sensor is installed in the installation groove. The device is used in cooperation with safe operation management of the transformer, can display the output voltage and the shell temperature of the transformer in real time during working, can display whether electric leakage, transformer oil reduction or over-temperature conditions exist or not, and can actively give out a prompt sound when someone approaches to prompt all approaching persons to watch various data of the transformer, so that the safety of the transformer is improved. And favorable technical support is provided for safe operation of the transformer and reduction of related accidents.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer auxiliary equipment, in particular to an indicating device applied to a transformer. Background Technique

[0002] Power transformers are mainly used in distribution systems. When working, they step down the electrical energy of high-voltage lines to the low voltage required by households and enterprises, and usually have a certain ability to adjust the load.

[0003] With the progress of power technology, transformer technology has also developed. For example, the authorized patent with the patent number "201510777794.7" and the patent name "A New Type of Transformer" in China records that "the structure of the new type of transformer is simple. By separating the heat absorption part and the heat dissipation part in the heat dissipation part, it can better dissipate the heat generated by the transformer body during operation, effectively improving the safety of transformer operation and increasing the service life of the transformer." As can be seen from the above, although the comparative patent has achieved the invention technical effects described therein, like other technologies in this field, there are still the following problems. Specifically, existing transformers generally only have a function of prompting approaching personnel (prompting relevant personnel not to touch the transformer, etc.), and do not have functions of temperature, output voltage, whether there is leakage, and internal transformer oil level prompting. In this way, when relevant management personnel conduct inspections, they can only generally understand the working conditions of the transformer from the appearance. When the transformer has problems such as too high temperature rise due to faults (such as load short circuit or inter-turn short circuit of the internal coil resulting in too high temperature rise), abnormal output voltage (such as internal coil short circuit or excessive electrical load resulting in abnormal output voltage), leakage (such as internal coil grounding resulting in leakage), and reduction of transformer oil (such as the transformer's own housing having gaps, etc., resulting in reduction of transformer oil), since the management personnel cannot timely understand the specific situation for disposal, there are certain potential safety hazards in the safe operation of the transformer. Content of the Utility Model

[0004] In order to overcome the drawback that existing transformers do not have a practical multi-data prompting device due to structural limitations as described in the background, the utility model provides an indicating device applied to a transformer that can be used in coordination with the safe operation management of the transformer. When working, it can real-time monitor and display the magnitude of the output voltage of the transformer, the housing temperature, whether there is leakage, and the reduction of transformer oil, and can actively emit a prompting sound when someone approaches, prompting all approaching personnel to view various data of the transformer, providing a favorable technical support for the safe operation of the transformer and reducing related accidents.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] An indicating device for transformer applications, comprising a voltmeter, a temperature display, and a pressure sensor, characterized in that it further has a leakage detection circuit, an oil quantity detection circuit, a proximity prompt circuit, and an over-temperature detection circuit; the voltmeter, the temperature display, the leakage detection circuit, the oil quantity detection circuit, the proximity prompt circuit, and the over-temperature detection circuit are installed in an element box, and there is an installation groove on one of the support frames of the transformer, and the pressure sensor is installed in the installation groove; the power input terminal of the voltmeter is electrically connected to the power output terminal of the transformer; the power output terminals of the leakage detection circuit, the oil quantity detection circuit, and the over-temperature detection circuit are electrically connected to the power input terminal of the proximity prompt circuit; the signal output terminal of the pressure sensor is electrically connected to the signal input terminal of the oil quantity detection circuit.

[0007] Further, the leakage detection circuit includes a resistor, a thyristor, a diode, and an alarm lamp that are electrically connected. One end of the resistor is connected to the outer side of the transformer housing, the other end of the resistor is connected to the control electrode of the thyristor, and the cathode of the thyristor is connected to the positive electrode of the diode and the positive power input terminal of the alarm lamp.

[0008] Further, the oil quantity detection circuit includes a variable resistor, a resistor, a triode, a relay, a diode, and an alarm lamp that are electrically connected. The positive power input terminal and the control power input terminal of the relay are connected. One end of the variable resistor, one end of the resistor, and the base of the triode are connected. The collector of the triode is connected to the negative power input terminal of the relay. The normally closed contact terminal of the relay is connected to the positive power input terminal of the alarm lamp and the positive electrode of the diode. The negative power input terminal of the alarm lamp is connected to the other end of the resistor and the emitter of the triode.

[0009] Further, the proximity prompt circuit includes a microwave detection module and a buzzer that are electrically connected. The power output terminal of the microwave detection module is connected to the power input terminal of the buzzer.

[0010] Further, the over-temperature detection circuit includes a temperature control switch, an alarm lamp, and a diode. One end of the temperature control switch is connected to the positive power input terminal of the alarm lamp and the positive electrode of the diode; the temperature control switch and the probe of the temperature display are respectively installed on the outer side of the transformer housing.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows: This new type is used in collaborative operation management of transformers. During operation, the voltmeter and temperature display can real-time display the output voltage and the temperature of the transformer housing. The leakage detection circuit, oil quantity detection circuit, and over-temperature detection circuit can real-time monitor whether there is leakage in the transformer housing, reduction of transformer oil, or over-temperature situation. And under the action of the proximity prompt circuit, when someone approaches, it can actively emit a prompt sound to prompt all approaching personnel to view various data of the transformer, providing favorable technical support for the safe operation of the transformer and reducing related accidents (for example, when passers-by approach and observe prompts such as too high temperature of the transformer, they can stay away from the transformer as much as possible to prevent accidents such as explosion caused by too high temperature of the transformer, thereby avoiding harm to approaching personnel). BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0013] Figure 1 It is a schematic structural diagram between the whole of the present utility model and the transformer.

[0014] Figure 2 It is a schematic installation structure diagram of the pressure sensor of the present utility model.

[0015] Figure 3 It is a circuit diagram of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] Figure 1 、 2 As shown in FIGS. 2 and 3, an indicating device applied to a transformer includes a voltmeter V, a temperature display W, a power supply module W1, a pressure sensor W2, and a storage battery G1. It also has a leakage detection circuit 1, an oil quantity detection circuit 2, a proximity prompt circuit 3, and an over-temperature detection circuit 4; the voltmeter V, the temperature display W, the power supply module W1, the leakage detection circuit 1, the oil quantity detection circuit 2, the proximity prompt circuit 3, the storage battery G1, and the over-temperature detection circuit 4 are installed in an element box 5. The element box 5 is installed at the front lower end of a support frame 61 of the transformer 6. There is a concave installation groove 611 at the upper part of the front support frame of the transformer 6. The pressure sensor W2 is installed in the installation groove 611 with the force-receiving surface facing upward, and the force-receiving surface of the pressure sensor W2 just contacts the lower middle part of the front end of the housing of the transformer 6 (a rubber pad 612 is bonded between the force-receiving surface of the pressure sensor W2 and the lower middle part of the left end of the housing of the transformer 6; so that the gravity of the transformer can effectively act on the force-receiving surface on one side of the pressure sensor).

[0017] Figure 1 、 2As shown in FIGS. 3, the leakage detection circuit includes a resistor R1, a thyristor VS, a diode VD, and an alarm lamp H connected by circuit board wiring. One end of the resistor R1 is connected to the outer side of the transformer 6 housing through a wire, the other end of the resistor R1 is connected to the control electrode of the thyristor VS, and the cathode of the thyristor VS is connected to the positive electrode of the diode VD and the positive electrode power input terminal of the alarm lamp H. The fuel quantity detection circuit includes a variable resistor RP, a resistor R2, a triode Q1, a relay J1, a diode VD1, and an alarm lamp H1 connected by circuit board wiring. The positive electrode power input terminal and the control power input terminal of the relay J1 are connected. One end of the variable resistor RP, one end of the resistor R2, and the base of the triode Q1 are connected. The collector of the triode Q1 is connected to the negative electrode power input terminal of the relay J1. The normally closed contact terminal of the relay J1 is connected to the positive electrode power input terminal of the alarm lamp H and the positive electrode of the diode VD1. The negative electrode power input terminal of the alarm lamp H is connected to the other end of the resistor R2 and the emitter of the triode Q1. The proximity prompt circuit includes a microwave detection module W3 and a buzzer B connected by circuit board wiring. The power output terminal 3 and the 2nd pin of the microwave detection module W3 are respectively connected to both ends of the power input of the buzzer B. The over-temperature detection circuit includes a temperature control switch K1, an alarm lamp H2, and a diode VD2. One end of the temperature control switch K1 is connected to the positive electrode power input terminal of the alarm lamp H2 and the positive electrode of the diode VD2. The temperature control switch K1 and the probe 7 of the temperature display are respectively installed on the outer side of the transformer 6 housing through a "]"-shaped fixing clip, and the temperature sensing surfaces of the temperature control switch K1 and the probe 7 are closely attached to the outer side of the housing. The display interface of the voltmeter V, the display interface of the temperature display W, and the alarm lamp H of the leakage detection circuit, the alarm lamp H1 of the fuel quantity detection circuit, and the alarm lamp H2 of the over-temperature detection circuit are respectively located outside the two openings and the three openings at the front end of the component box 5. The front end of the microwave detection module W2 of the proximity prompt circuit is located outside the fourth opening at the front end of the component box 5. Figure 3Among them, the power supply module W1 is a finished product of an AC 220V power supply to DC 12V switching power supply module; the triode Q1 is an NPN type triode of model 9013; the relay J1 model is DC12V; the buzzer B is an active continuous sound high-decibel alarm of model HND-4216; the resistance values of resistors R1 and R2 are 1M and 10K respectively; the temperature control switch K1 is a snap-action normally open contact temperature switch (55°C) of model KSD301; the adjustable resistor RP has a resistance value of 470K (in this embodiment, it is adjusted to 63.5K. The larger its resistance value, the greater the voltage division. In this way, when the detected transformer oil volume is relatively large, the relay J1 will be energized and attracted, that is, the oil volume detection threshold is set relatively large; the smaller its resistance value, the smaller the voltage division. In this way, when the detected transformer oil volume is relatively small, the relay J1 will be energized and attracted, that is, the oil volume detection threshold is set relatively small); the pressure sensor W2 is a finished product of a force-measuring load cell of model HYMH-019, which has two power input terminals and one signal output terminal. The greater the detected weight, the higher the output voltage signal, and vice versa, the lower the output voltage signal; the diode VD, VD1, VD2 models are 1N4007; the alarm lights H, H1, H2 are red, green, and yellow alarm lights with a power of 2W respectively; the microwave detection module W2 is a finished product of a human body micro-motion induction radar module of model YG-V06, which has two power input terminals and one signal output terminal. When its detection head detects a human body signal in the circumferential direction, the signal output terminal will output power (it has a distance detection adjustment knob, which is adjusted to about 4 meters in this embodiment); the voltmeter V is a finished product of a large-screen digital display voltmeter of model DL85-2030; the temperature display W is a finished product of a large-screen digital display temperature display of model SM830 (it is equipped with a split-type detection head).

[0018] Figure 1 , 2As shown in Figures 1 and 3, the power input terminals 1 and 2 of the power supply module W1, the power input terminal of the voltmeter V, and the output terminal of the 220V power supply of the transformer (such as one phase wire and the neutral wire of the three-phase four-wire power supply output) are respectively connected by wires. The power output terminals 3 and 4 of the power supply module W1 and the two poles of the storage battery G1, as well as the power input terminal of the leakage detection circuit (the anode of the thyristor VS and the power input terminal of the negative pole of the alarm lamp H), the power input terminal of the fuel quantity detection circuit (the positive pole of the relay J1 and the power input terminal of the negative pole of the alarm lamp H1), the power input terminal of the over-temperature detection circuit (the other end of the temperature control switch K1 and the power input terminal of the negative pole of the alarm lamp H2), the power input terminals 1 and 2 of the pressure sensor W2, and the power input terminals 1 and 2 of the temperature display W are respectively connected by wires. The negative pole of the diode VD of the leakage detection circuit, the negative pole of the diode VD1 of the fuel quantity detection circuit, the negative pole of the diode VD2 of the over-temperature detection circuit, the power output terminal 4 of the power supply module W1, and the power input terminals 1 and 2 of the microwave detection module W2 of the proximity prompt circuit are respectively connected by wires. The signal output terminal 3 of the pressure sensor W2 and the other end of the adjustable resistor RP at the signal input terminal of the fuel quantity detection circuit are connected by a wire.

[0019] Figure 1 、 2, as shown in Figures 1 and 3, this new type is mainly used in coordination with the safe operation management of transformers. After the AC 220V power supply enters the power input terminal of the power module W1, the stable DC 12V power supply output from pins 3 and 4 of the power module W1 enters the storage battery G1 (usually for floating charging of the 12V storage battery G1, so that other circuits can still be powered on and work after the subsequent transformer is powered off), as well as the power input terminals of the leakage detection circuit, oil quantity detection circuit, over-temperature detection circuit, pressure sensor W2, and temperature display W. During operation, the voltmeter V can detect and display the voltage of the power supply output by the transformer in real time. After the temperature display W (whose detection head K detects the temperature of the transformer shell) is powered on and works, it can display the shell temperature of the transformer in real time as the temperature of the transformer shell changes. After the leakage detection circuit is powered on and works, when there is no leakage in the transformer 6, the thyristor VS will not be triggered and conducted, so the alarm lamp H will not be powered on and work; when there is leakage in the transformer 6, the leakage current will trigger the thyristor VS to conduct after being stepped down and current-limited by the resistor R1. Subsequently, the alarm lamp H will be powered on and emit light, indicating to the subsequent approaching personnel that the transformer has a leakage. After the over-temperature detection circuit is powered on, if the temperature of the transformer is normal and the outer temperature of the shell is lower than a certain value (such as lower than 55°C), the internal circuit of the temperature control switch K1 is open, and the alarm lamp H2 will not be powered on and emit light; if the temperature of the transformer is abnormal and the outer temperature of the shell is higher than a certain value (such as higher than 55°C), the internal circuit of the temperature control switch K1 is closed, and the 12V power supply enters the power input terminal of the alarm lamp H2, and the alarm lamp H2 will be powered on and emit light, indicating to the subsequent approaching personnel that the shell temperature of the transformer is over-temperature. After the oil quantity detection circuit is powered on and works, the weight on one side of the transformer will act on the pressure sensor W2. The heavier the weight of the transformer 6, the greater the weight acting on the pressure sensor W2, and the relatively higher the voltage signal output from pin 3 of the pressure sensor A2. On the contrary, the voltage signal output from pin 3 of the pressure sensor W2 is relatively low. When the oil quantity in the transformer is not less than the threshold value (relatively large weight), the voltage signal output from pin 3 of the pressure sensor W2 is relatively high. This voltage signal is divided by the adjustable resistor RP and the resistor R2 and enters the base of the triode Q1 higher than 0.7V, and the triode Q1 will conduct, and its collector will output a low level and enter the negative power input terminal of the relay J1. The relay J1 is powered on and attracted, and its control power input terminal and normally closed contact terminal are open. At this moment, the alarm lamp H2 will not be powered on and emit light. When the oil quantity in the transformer is less than the threshold value (relatively light weight), the voltage signal output from pin 3 of the pressure sensor W2 is relatively low. This voltage signal is divided by the adjustable resistor RP and the resistor R2 and enters the base of the triode Q1 lower than 0.7V, and the triode Q1 will cut off, and its collector will no longer output a low level and enter the negative power input terminal of the relay J1. The relay J1 loses power and no longer closes and attracts, and its control power input terminal and normally closed contact terminal are closed. At this moment, the alarm lamp H1 will be powered on and emit light, indicating to the subsequent approaching personnel that the oil quantity in the transformer is too small (the transformer has a certain danger).Through the above, the present application can detect and display in real time and prompt subsequent inspection personnel of the output voltage and the housing temperature of the transformer, whether there is electric leakage or overheating in the transformer housing, and whether the transformer oil is reduced. After the management personnel timely understand the specific situation, they can take measures to ensure the safe operation and power supply of the transformer as much as possible (for example, when it is known that the transformer temperature is too high, the output voltage is too high or too low, the housing is electrified, or the transformer oil volume is reduced, the maintenance personnel can be contacted in time for maintenance, etc.).

[0020] Figure 1 , 2 As shown in Fig. 3, in this new type, when there is electric leakage in the transformer housing and the thyristor VS is turned on, the 12V power supply will conduct unidirectionally through the diode VD and enter the power input terminal of the microwave detection module W2; when the transformer oil is reduced to a certain extent and the relay J1 loses power, the 12V power supply will conduct unidirectionally through the diode VD1 and enter the power input terminal of the microwave detection module W2; when the internal contacts of the temperature control switch K1 are closed due to the over-standard temperature of the transformer housing, the 12V power supply will conduct unidirectionally through the diode VD2 and enter the power input terminal of the microwave detection module W2. Through the above, when any of the situations of overheating of the transformer, reduction of the transformer oil, and electric leakage of the transformer occurs, the microwave detection module W2 will be powered on and work; when no one approaches the circumference within about 4 meters around the transformer, the 3rd pin of the microwave detection module W2 does not output power, and the buzzer B will not be powered on and sound; when someone approaches, the 3rd pin of the microwave detection module W2 outputs power and enters the positive power input terminal of the buzzer B, and the buzzer B will be powered on and sound to prompt all approaching personnel (mainly passing pedestrians) to view various data of the transformer, which provides favorable technical support for the safe operation of the transformer and reduction of related accidents (for example, when passers-by approach and observe prompts such as too high transformer temperature, reduction of transformer oil volume, and electric leakage of the transformer housing, they should stay away from the transformer as much as possible to prevent electric shock accidents, explosions caused by too high transformer temperature, etc., which may cause harm to approaching personnel).

[0021] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is limited to the details of the above exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights involved.

[0022] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An indicating device for transformer application, comprising a voltmeter, a temperature display, and a pressure sensor, characterized in that: It also has a leakage detection circuit, an oil level detection circuit, a proximity prompt circuit, and an over-temperature detection circuit; the voltmeter, temperature display, leakage detection circuit, oil level detection circuit, proximity prompt circuit, and over-temperature detection circuit are installed in a component box, one of the support frames of the transformer has an installation slot, and the pressure sensor is installed in the installation slot; the power input end of the voltmeter is electrically connected to the power output end of the transformer; the power output ends of the leakage detection circuit, oil level detection circuit, and over-temperature detection circuit are electrically connected to the power input end of the proximity prompt circuit; the signal output end of the pressure sensor is electrically connected to the signal input end of the oil level detection circuit.

2. The indicator device for transformer application according to claim 1, characterized in that: The leakage detection circuit includes an electrically connected resistor, a thyristor, a diode and an alarm light. One end of the resistor is connected to the outside of the transformer housing, the other end of the resistor is connected to the thyristor control electrode, and the thyristor cathode is connected to the diode anode and the positive power input end of the alarm light.

3. The indicator device for transformer application according to claim 1, characterized in that: The oil level detection circuit includes an electrically connected adjustable resistor, a resistor, a transistor, a relay, a diode and an alarm light. The positive power input terminal of the relay is connected to the control power input terminal, one end of the adjustable resistor is connected to one end of the resistor and the base of the transistor, the collector of the transistor is connected to the negative power input terminal of the relay, the normally open contact end of the relay is connected to the positive power input terminal of the alarm light and the positive pole of the diode, and the negative power input terminal of the alarm light is connected to the other end of the resistor and the emitter of the transistor.

4. The indicator device for transformer application according to claim 1, characterized in that: The approach warning circuit comprises a microwave detection module and an alarm which are electrically connected, and a power output end of the microwave detection module is connected to a power input end of the alarm.

5. The indicator device for transformer application according to claim 1, characterized in that: The over-temperature detection circuit includes a temperature control switch, an alarm light, and a diode. One end of the temperature control switch is connected to the positive power input end of the alarm light and the positive pole of the diode. The temperature control switch and the probe of the temperature display are respectively installed on the outside of the transformer housing.

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