CN217955625U - Oil level indicator for transformer - Google Patents
Oil level indicator for transformer Download PDFInfo
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- CN217955625U CN217955625U CN202221607904.7U CN202221607904U CN217955625U CN 217955625 U CN217955625 U CN 217955625U CN 202221607904 U CN202221607904 U CN 202221607904U CN 217955625 U CN217955625 U CN 217955625U
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Abstract
The utility model relates to an oil level gaugember technical field, the utility model provides an oil level gaugember for transformer, be used for storing up the oil tank, store up the oil tank and be equipped with and store up the oil tank end cover, a serial communication port, including first connecting pipe, the second connecting pipe, union pipe and ultrasonic detection system, be equipped with upper end hole and lower extreme hole on the store up the oil tank end cover, upper end hole is connected to the first end of first connecting pipe, the second end of first connecting pipe and the upper end intercommunication of union pipe, lower extreme hole is connected to the first end of second connecting pipe, the second end of second connecting pipe and the lower extreme intercommunication of union pipe, all be equipped with the stop valve in the middle of first connecting pipe and the second connecting pipe, ultrasonic detection system sets up the upper end at the union pipe, through above-mentioned technical scheme, change or maintenance oil level timing among the prior art has been solved, need arrange oil to the oil storage tank, the problem of mending oil.
Description
Technical Field
The utility model relates to an oil level gaugember technical field, it is specific relates to an oil level gaugember for transformer.
Background
The oil level is one of important monitoring parameters of a power transformer, the oil level monitoring of a large oil-immersed transformer is a premise for ensuring the safe operation of the transformer, the condition that the oil level is too low or too high is found in time, and corresponding measures are taken to have important significance for ensuring the safe operation of the power transformer.
SUMMERY OF THE UTILITY MODEL
The utility model provides an oil level gaugember for transformer has solved and has changed or overhaul the oil level timing among the prior art, need arrange oil, mend the problem of oil to the oil conservator.
The technical scheme of the utility model as follows:
the utility model provides an oil level gaugember for transformer for the oil conservator, the oil conservator is equipped with the oil conservator end cover, including first connecting pipe, second connecting pipe, union pipe and ultrasonic detection system, be equipped with upper end hole and lower extreme hole on the oil conservator end cover, the first end of first connecting pipe is connected the upper end hole, the second end of first connecting pipe with the upper end intercommunication of union pipe, the first end of second connecting pipe is connected the lower extreme hole, the second end of second connecting pipe with the lower extreme intercommunication of union pipe, first connecting pipe with all be equipped with the stop valve in the middle of the second connecting pipe, ultrasonic detection system sets up the upper end of union pipe.
Further, in the utility model discloses in ultrasonic detection system includes main control unit and ultrasonic detection unit, ultrasonic detection unit with the main control unit is connected, ultrasonic detection unit includes ultrasonic emission circuit and ultrasonic receiving circuit, ultrasonic emission circuit includes driver U1, field effect transistor Q1, resistance R2, electric capacity C1, diode D2, rheostat RP1 and ultrasonic emitter Y1, driver U1's input is connected the main control unit, driver U1's output is connected field effect transistor Q1's grid, field effect transistor Q1's grid passes through resistance R1 connects field effect transistor Q1's source electrode, field effect transistor Q1's source electrode ground connection, field effect transistor Q1's drain electrode passes through resistance R2 connects the 300V power, field effect transistor Q1's drain electrode passes through electric capacity C1 connects diode D1's positive pole, diode D1's negative pole ground connection, diode D2's positive pole is connected varistor RP 1's first end, rheostat RP 1's second end is in ultrasonic emitter in parallel connection.
Further, the utility model discloses in ultrasonic wave receiving circuit includes signal conditioning circuit and signal comparison circuit, signal conditioning circuit's input does ultrasonic wave receiving circuit's input, signal conditioning circuit's output is connected signal comparison circuit's input, signal comparison circuit's output is connected the main control unit, signal conditioning circuit includes analog switch U2, ultrasonic receiver, resistance R3, resistance R4, fortune are put U3, electric capacity C3, resistance R5, fortune and U4 and resistance R6 are put to fortune, the inverting input that U3 was put to fortune passes through resistance R4 connects ultrasonic receiver's first end, U3's homophase input ground connection is put to fortune, ultrasonic receiver's second end ground connection, resistance R3's first end is connected ultrasonic receiver's first end, resistance R3's second end ground connection, analog switch U2's first end is connected resistance R3's first end, analog switch U2's second end ground connection, analog switch U2's control end is connected the main control unit, U3's output is put to fortune the output pass through resistance R3 the inverting input of connecting resistance R4, the inverting input of fortune is put U4 of U4, the inverting input of U4 is put to fortune is put the input of connection of U4, the input of fortune is put.
Further, the utility model discloses in U5 and D trigger U6 are put to signal comparison circuit includes electric capacity C4, rheostat RP2, fortune, electric capacity C4's first end is connected signal conditioning circuit's output, electric capacity C4's second end is connected rheostat RP 2's first end, rheostat RP 2's second end ground connection, rheostat RP 2's slip end is connected U5's in-phase input end is put to fortune, U5's inverting input end ground connection is put to fortune, U5's output is put to fortune is connected D trigger U6's control end, D trigger U6's input is connected the main control unit, D trigger U6's output is connected the main control unit.
Further, the utility model discloses in still include alarm circuit, alarm circuit includes field effect transistor Q2, field effect transistor Q3, emitting diode LED1, emitting diode LED2 and bee calling organ LS1, field effect transistor Q2's grid is connected the main control unit, field effect transistor Q2's drain electrode is connected emitting diode LED 1's negative pole, emitting diode LED 1's positive pole is connected 5V power, field effect transistor Q2's source ground connection, field effect transistor Q3's grid is connected the main control unit, emitting diode LED 2's negative pole is connected to field effect transistor Q3's drain electrode, emitting diode LED 2's positive pole is connected 5V power, field effect transistor Q3's source electrode is connected bee calling organ LS 1's first end, bee calling organ LS 1's second end ground connection.
The utility model discloses a theory of operation and beneficial effect do:
the utility model discloses in through set up first connecting pipe, second connecting pipe and yoke in oil storage cabinet one side, with the help of the effect of first connecting pipe and second connecting pipe, make the yoke highly unanimous with the liquid level that stores up the oil storage cabinet, through the liquid level height that detects in the yoke just can acquire the liquid level height in the oil storage cabinet. Close the stop valve on first connecting pipe and the second connecting pipe and can realize the utility model discloses a change or maintenance need arrange the problem of oil supplementation when having solved current oil level gaugember and changing or maintaining.
The utility model discloses well first end of first connecting pipe, second connecting pipe welds respectively in the upper and lower trompil department of storing up the oil tank end cover, and the union coupling is connected to first connecting pipe, second connecting pipe, and the oil in the oil tank flows into the union coupling through first connecting pipe and second connecting pipe, and ultrasonic detection system sets up in the upper end of union coupling, and ultrasonic detection system can judge out oil level position in the oil tank through the ultrasonic wave.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a view of the structure of the present invention;
fig. 2 is a circuit diagram of the ultrasonic transmitting circuit of the present invention;
fig. 3 is a circuit diagram of the signal conditioning circuit of the present invention;
fig. 4 is a circuit diagram of the signal comparison circuit of the present invention;
fig. 5 is a circuit diagram of the alarm circuit of the present invention.
In the figure: 1. first connecting pipe, 2, second connecting pipe, 3, antithetical couplet pipe, 4, oil conservator end cover.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive work, are related to the scope of protection of the present invention.
Example 1
As shown in fig. 1, this embodiment provides an oil level indicator for transformer, be used for the oil conservator, the oil conservator is equipped with oil conservator end cover 4, a serial communication port, including first connecting pipe 1, second connecting pipe 2, union 3 and ultrasonic detection system, be equipped with upper end hole and lower extreme hole on the oil conservator end cover 4, the upper end hole is connected to the first end of first connecting pipe 1, the second end of first connecting pipe 1 and the upper end intercommunication of union 3, the lower extreme hole is connected to the first end of second connecting pipe 2, the second end of second connecting pipe 2 and the lower extreme intercommunication of union 3, all be equipped with the stop valve in the middle of first connecting pipe 1 and the second connecting pipe 2, ultrasonic detection system sets up the upper end at union 3.
In this embodiment, it is more accurate for guaranteeing to measure the oil level, it is higher than the oil conservator standard oil level upper limit value to store up 4 upper end holes of oil conservator end cover, lower extreme hole sets up and is less than oil conservator standard oil level lower limit value, first connecting pipe 1, the first end of second connecting pipe 2 welds respectively in the upper and lower extreme hole department of oil conservator end cover, first connecting pipe 1, second connecting pipe 2 connects union coupling 3, oil in the oil conservator flows into union coupling 3 through first connecting pipe 1 and second connecting pipe 2, ultrasonic detection system sets up the upper end at union coupling 3, ultrasonic detection system can judge liquid level position in the oil conservator through the ultrasonic wave.
The present embodiment only need close when changing or overhauing stop valve on first connecting pipe 1 and the second connecting pipe 2 can, solved the problem that needs the oil extraction benefit oil when current oil level gaugember is changed or overhauls.
As shown in fig. 2, the ultrasonic detection system in this embodiment includes a main control unit and an ultrasonic detection unit, the ultrasonic detection unit is connected to the main control unit, the ultrasonic detection unit includes an ultrasonic transmission circuit and an ultrasonic receiving circuit, the ultrasonic transmission circuit includes a driver U1, a field-effect tube Q1, a resistor R2, a capacitor C1, a diode D2, a varistor RP1 and an ultrasonic emitter Y1, an input end of the driver U1 is connected to the main control unit, an output end of the driver U1 is connected to a gate of the field-effect tube Q1, the gate of the field-effect tube Q1 is connected to a source of the field-effect tube Q1 through the resistor R1, the source of the field-effect tube Q1 is grounded, a drain of the field-effect tube Q1 is connected to an anode of the diode D1 through the capacitor C1, a cathode of the diode D1 is grounded, a cathode of the diode D2 is connected to an anode of the diode D1, an anode of the diode D2 is connected to a first end of the varistor RP1, a second end of the varistor RP1 is grounded, and the ultrasonic emitter Y1 is connected in parallel to two ends of the varistor 1.
The main control unit outputs a pulse signal with fixed frequency, the ultrasonic transmitting circuit boosts the voltage and drives the ultrasonic probe to send out ultrasonic waves. The echo signal is received by an ultrasonic receiver and converted into a weak electric signal, and high-voltage pulse is emitted in a mixed manner. After the signal is amplified in two stages, the signal is compared through a voltage comparator, a square wave signal is continuously output from the voltage comparator, the square wave signal is sent to a main control unit, and the required data can be obtained after the square wave signal is processed by the main control unit. The processed data can be sent to the display terminal through the wireless communication unit, and the display terminal can be installed at a position convenient for observation and maintenance according to the field environment.
The transmitting circuit has the task of generating high-voltage pulse with the same frequency as the probe to excite the ultrasonic transmitter Y1 to transmit ultrasonic waves, and generating a square wave pulse with fixed frequency through the main control unit to control the on and off of the field effect transistor Q1, so that the high-voltage pulse is generated to trigger the ultrasonic transmitter Y1, and in order to improve the driving capability of periodic trigger pulse, the MOSFET driver U1 with double-channel reverse input is selected to convert the input square wave signal into high-voltage and high-current output, so that the MOSFET driver U1 is suitable for driving the field effect transistor Q1 with large capacitance power.
Firstly, a charging capacitor C1 is charged to 300V high voltage through a charging resistor R2 and a diode D1, when a pulse signal of a main control unit is low level, the high level is output to a grid electrode of a field effect tube Q1 after being driven by a driver U1, the field effect tube Q1 is instantly conducted, namely, the high voltage of a drain electrode of the field effect tube Q1 is instantly pulled down, and due to the energy storage effect of the capacitor C1, the voltages at two sides cannot be instantly transited, so that a high-voltage negative sharp wave pulse signal with sufficient energy is formed and connected in parallel at two ends of a probe, the probe is excited to generate ultrasonic waves, and in order to prevent invalid triggering of the positive sharp wave pulse signal, an inverse triggering protection circuit formed by the diodes D1 and D2 is added. The fast recovery diodes D1 and D2 filter out charging pulses, so that the anode of the diode D2 in the figure 2 only has negative voltage excitation pulses during discharging, the rheostat RP1 connected with the probe in parallel determines the damping condition of the circuit, and when the resistance value of the rheostat RP1 is small, the emission pulse width is narrow and the intensity is small; when the resistance value of the rheostat RP1 is large, the emission pulse width is wide, and the intensity is large. When the waveform is debugged, the working damping of the trigger circuit can be changed by changing the resistance value of the rheostat RP1, so that the emission intensity of the emission pulse is adjusted.
As shown in fig. 3, the ultrasonic receiving circuit in this embodiment includes a signal conditioning circuit and a signal comparison circuit, an input terminal of the signal conditioning circuit is used as an input terminal of the ultrasonic receiving circuit, an output terminal of the signal conditioning circuit is connected to an input terminal of the signal comparison circuit, an output terminal of the signal comparison circuit is connected to the main control unit, the signal conditioning circuit includes an analog switch U2, an ultrasonic receiver, a resistor R3, a resistor R4, an operational amplifier U3, a capacitor C3, a resistor R5, an operational amplifier U4 and a resistor R6, an inverting input terminal of the operational amplifier U3 is connected to a first terminal of the ultrasonic receiver through the resistor R4, an non-inverting input terminal of the operational amplifier U3 is grounded, a second terminal of the ultrasonic receiver is grounded, a first terminal of the resistor R3 is connected to a first terminal of the ultrasonic receiver, a second terminal of the resistor R3 is grounded, a first terminal of the analog switch U2 is connected to a first terminal of the resistor R3, a second terminal of the analog switch U2 is grounded, a control terminal of the analog switch U2 is connected to the main control unit, an output terminal of the operational amplifier U3 is connected to a first terminal of the resistor R5 through the capacitor C3, a second terminal of the operational amplifier U4 is connected to a second terminal of the inverting input terminal of the operational amplifier U4, an inverting input terminal of the operational amplifier U4, and an inverting input terminal of the operational amplifier is connected to a non-inverting input terminal of the operational amplifier U4, and an inverting input terminal of the operational amplifier is connected to a signal comparison circuit, and an inverting input terminal of the operational amplifier.
The ultrasonic receiving circuit comprises a signal conditioning circuit and a signal comparison circuit. In the signal conditioning circuit of the embodiment, the TR40-16 is selected as the ultrasonic receiver, and in the actual measurement process, in order to better meet the measurement requirement, the distance between the ultrasonic receiver and the ultrasonic transmitter is short. When the ultrasonic transmitter Y1 transmits the ultrasonic wave, it may happen that the ultrasonic receiver receives the ultrasonic wave directly, i.e., there is an influence of the direct wave. The acoustic signal will carry this portion of the signal, which can interfere with the echo signal detection. The circuit adopts analog switch U2 to shield the direct wave signal, and when the ultrasonic wave is transmitted, the main control unit sends a low level signal to the control end of the analog switch U2, cuts off the receiving circuit and shields the receiving probe. After the transmission is finished, the analog switch U2 is switched on, the signal conditioning circuit plays a role, and the ultrasonic receiver is prevented from directly receiving the transmitted sound waves. Because the electrical signal converted by the ultrasonic receiver is very weak, the echo signal is amplified twice by the operational amplifier U3 and the operational amplifier U4 and then sent to the input end of the signal comparison circuit, and the square wave of the sine wave is converted.
As shown in fig. 4, in this embodiment, the signal comparison circuit includes a capacitor C4, a rheostat RP2, an operational amplifier U5 and a D flip-flop U6, a first end of the capacitor C4 is connected to an output end of the signal conditioning circuit, a second end of the capacitor C4 is connected to a first end of the rheostat RP2, a second end of the rheostat RP2 is grounded, a sliding end of the rheostat RP2 is connected to a non-inverting input end of the operational amplifier U5, an inverting input end of the operational amplifier U5 is grounded, an output end of the operational amplifier U5 is connected to a control end of the D flip-flop U6, an input end of the D flip-flop U6 is connected to the main control unit, and an output end of the D flip-flop U6 is connected to the main control unit.
The comparison is carried out by an electric voltage comparator circuit, and a square wave signal is continuously output from the electric voltage comparator circuit. The circuit needs to ensure that the clock end of the D flip-flop U6 can be controlled, and needs to ensure that a low level set in advance is continuously sent from the output end of the D flip-flop U6 to the input end of the D flip-flop U6. The main control unit can control signals of an interrupter inside the main control unit to ensure effective interruption of the main control unit, and the main control unit obtains required data by judging the time of receiving the ultrasonic signals.
As shown in fig. 5, in this embodiment, the monitoring device further includes an alarm circuit, the alarm circuit includes a field effect transistor Q2, a field effect transistor Q3, a light emitting diode LED1, a light emitting diode LED2, and a buzzer LS1, a gate of the field effect transistor Q2 is connected to the main control unit, a drain of the field effect transistor Q2 is connected to a cathode of the light emitting diode LED1, an anode of the light emitting diode LED1 is connected to the 5V power supply, a source of the field effect transistor Q2 is grounded, a gate of the field effect transistor Q3 is connected to the main control unit, a drain of the field effect transistor Q3 is connected to a cathode of the light emitting diode LED2, an anode of the light emitting diode LED2 is connected to the 5V power supply, a source of the field effect transistor Q3 is connected to a first end of the buzzer LS1, and a second end of the buzzer LS1 is grounded.
During this embodiment work, the main control unit continuously sends high level signal to field effect transistor Q2's grid, and field effect transistor Q2 switches on this moment, and emitting diode LED1 sends green light, and emitting diode LED1 is the work pilot lamp, and it is to be less than the set lower limit value when the oil level of oil storage cabinet, and the main control unit sends high level signal to field effect transistor Q3's grid, and field effect transistor Q3 switches on, and emitting diode LED2 sends red light this moment, and buzzer LS1 switches on simultaneously and sends the ring.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the present invention.
Claims (5)
1. The utility model provides an oil level gaugember for transformer for the oil storage cabinet, the oil storage cabinet is equipped with oil storage cabinet end cover (4), a serial communication port, including first connecting pipe (1), second connecting pipe (2), antithetical couplet pipe (3) and ultrasonic detection system, be equipped with upper end hole and lower extreme hole on oil storage cabinet end cover (4), the first end of first connecting pipe (1) is connected the upper end hole, the second end of first connecting pipe (1) with the upper end intercommunication of antithetical couplet pipe (3), the first end of second connecting pipe (2) is connected the lower end hole, the second end of second connecting pipe (2) with the lower extreme intercommunication of antithetical couplet pipe (3), first connecting pipe (1) with all be equipped with the stop valve in the middle of second connecting pipe (2), ultrasonic detection system sets up the upper end of antithetical couplet pipe (3).
2. The oil level indicator for the transformer according to claim 1, wherein the ultrasonic detection system comprises a main control unit and an ultrasonic detection unit, the ultrasonic detection unit is connected with the main control unit, the ultrasonic detection unit comprises an ultrasonic transmitting circuit and an ultrasonic receiving circuit, the ultrasonic transmitting circuit comprises a driver U1, a field effect transistor Q1, a resistor R2, a capacitor C1, a diode D2, a rheostat RP1 and an ultrasonic emitter Y1, an input end of the driver U1 is connected with the main control unit, an output end of the driver U1 is connected with a gate of the field effect transistor Q1, the gate of the field effect transistor Q1 is connected with a source of the field effect transistor Q1 through the resistor R1, the source of the field effect transistor Q1 is grounded, a drain of the field effect transistor Q1 is connected with a 300V power supply through the resistor R2, a drain of the field effect transistor Q1 is connected with an anode of the diode D1 through the capacitor C1, a cathode of the diode D1 is grounded, an anode of the diode D2 is connected with an anode of the diode RP1, a first end of the rheostat is connected with two ends of the varistor in parallel, and a second end of the varistor is connected with the second end of the varistor Y1.
3. The oil level gauge for the transformer according to claim 2, wherein the ultrasonic receiving circuit comprises a signal conditioning circuit and a signal comparison circuit, an input end of the signal conditioning circuit is used as an input end of the ultrasonic receiving circuit, an output end of the signal conditioning circuit is connected with an input end of the signal comparison circuit, an output end of the signal comparison circuit is connected with the main control unit, the signal conditioning circuit comprises an analog switch U2, an ultrasonic receiver, a resistor R3, a resistor R4, an operational amplifier U3, a capacitor C3, a resistor R5, an operational amplifier U4 and a resistor R6, an inverting input end of the operational amplifier U3 is connected with a first end of the ultrasonic receiver through the resistor R4, a non-inverting input end of the operational amplifier U3 is grounded, ultrasonic receiver's second end ground connection, resistance R3's first end is connected ultrasonic receiver's first end, resistance R3's second end ground connection, analog switch U2's first end is connected resistance R3's first end, analog switch U2's second end ground connection, analog switch U2's control end is connected the main control unit, the output that U3 was put to fortune passes through electric capacity C3 connects resistance R5's first end, resistance R5's second end is connected U4's inverting input is put to fortune, U4's non inverting input end ground connection is put to fortune, U4's output is put to fortune passes through resistance R6 connects U4's inverting input is put to fortune, U4's output is put to fortune is connected signal comparison circuit's input.
4. The oil level indicator for the transformer according to claim 3, wherein the signal comparison circuit comprises a capacitor C4, a rheostat RP2, an operational amplifier U5 and a D flip-flop U6, a first end of the capacitor C4 is connected to the output end of the signal conditioning circuit, a second end of the capacitor C4 is connected to the first end of the rheostat RP2, a second end of the rheostat RP2 is grounded, a sliding end of the rheostat RP2 is connected to the non-inverting input end of the operational amplifier U5, the inverting input end of the operational amplifier U5 is grounded, the output end of the operational amplifier U5 is connected to the control end of the D flip-flop U6, the input end of the D flip-flop U6 is connected to the main control unit, and the output end of the D flip-flop U6 is connected to the main control unit.
5. The oil level gauge for the transformer according to claim 2, further comprising an alarm circuit, wherein the alarm circuit comprises a field effect transistor Q2, a field effect transistor Q3, a light emitting diode LED1, a light emitting diode LED2 and a buzzer LS1, a gate of the field effect transistor Q2 is connected to the main control unit, a drain of the field effect transistor Q2 is connected to a cathode of the light emitting diode LED1, an anode of the light emitting diode LED1 is connected to a 5V power supply, a source of the field effect transistor Q2 is grounded, a gate of the field effect transistor Q3 is connected to the main control unit, a drain of the field effect transistor Q3 is connected to a cathode of the light emitting diode LED2, an anode of the light emitting diode LED2 is connected to a 5V power supply, a source of the field effect transistor Q3 is connected to a first end of the buzzer LS1, and a second end of the buzzer LS1 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221607904.7U CN217955625U (en) | 2022-06-23 | 2022-06-23 | Oil level indicator for transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221607904.7U CN217955625U (en) | 2022-06-23 | 2022-06-23 | Oil level indicator for transformer |
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| Publication Number | Publication Date |
|---|---|
| CN217955625U true CN217955625U (en) | 2022-12-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221607904.7U Active CN217955625U (en) | 2022-06-23 | 2022-06-23 | Oil level indicator for transformer |
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| Country | Link |
|---|---|
| CN (1) | CN217955625U (en) |
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- 2022-06-23 CN CN202221607904.7U patent/CN217955625U/en active Active
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