CN215003926U - Intelligent distribution transformer visual front-end vibration sensing device - Google Patents
Intelligent distribution transformer visual front-end vibration sensing device Download PDFInfo
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- CN215003926U CN215003926U CN202120920986.XU CN202120920986U CN215003926U CN 215003926 U CN215003926 U CN 215003926U CN 202120920986 U CN202120920986 U CN 202120920986U CN 215003926 U CN215003926 U CN 215003926U
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Abstract
The utility model provides a visual front end vibration perception device of intelligence distribution transformer, through set up voltage stabilizing circuit at offset circuit's output, carry out the steady voltage processing to the reference voltage signal of offset circuit output, make it not change along with the load change, guarantee that offset circuit's output is stable to improve the sampling precision; a voltage follower and an amplifier are arranged in the voltage stabilizing circuit, and the purposes of buffering and improving input impedance are realized through the voltage follower; when the load changes, the amplification factor of the amplifier is adjusted to ensure that the output signal of the bias circuit is stable and cannot change along with the change of the load, so that the direct current signal output by the bias circuit is constant; by arranging the addition circuit and increasing the 0V reference voltage of the alternating current signal output by the vibration sensor in a voltage increasing mode, the alternating current signal is collected by the microprocessor.
Description
Technical Field
The utility model relates to a distribution transformer fault monitoring technology field especially relates to visual front end vibration perception device of intelligence distribution transformer.
Background
The intelligent distribution transformer visual front-end state sensing system is used for load operation and fault monitoring of a distribution transformer, and is a set of intelligent distribution transformer comprehensive control platform with remote transmission capability, centralized management and timely notification. The operation parameters of the distribution transformer can be collected, the collected information can be transmitted to a main station or other intelligent devices, required data are provided for remote operation, control and management of a distribution system, the state of the distribution transformer can be further analyzed, and state maintenance and risk assessment of the distribution transformer are achieved.
Distribution transformer vibration mainly originates from the core and the windings. The transformer core is composed of laminated silicon steel sheets, and the magnetic expansion and contraction of the silicon steel sheets under a strong magnetic field causes the vibration of the core. The vibration amplitude is proportional to the square of the excitation voltage. The vibration caused by the winding and the iron core is transmitted to the wall of the transformer box through different paths, and the change of the iron core and the winding in the transformer box can be monitored by collecting and analyzing vibration signals of the wall of the transformer box. A vibration sensor is arranged on the surface of a distribution transformer, vibration signals of the equipment in the operation process are obtained and output to a microprocessor after being processed by a signal processing circuit, the microprocessor extracts time domain and frequency domain characteristic information to form information representing the operation state of the equipment, and then the working state of the equipment is evaluated by adopting a certain fault diagnosis method.
Because the output signal of the vibration sensor is a +/-5V alternating current signal, the fluctuation is carried out by taking 0V as reference voltage, and the limitation of the limit value of a rear-stage operational amplifier causes that half-wave shapes smaller than 0V in the +/-5V alternating current signal cannot be amplified, in order to collect negative half-wave signals, an adding circuit is generally arranged in a signal processing circuit to carry out voltage lifting on the output signal of the vibration sensor, and the 0V reference voltage of the output alternating current signal of the vibration sensor is lifted so as to be collected by a microprocessor. The principle of the addition circuit is to add an alternating current signal output by the vibration sensor and a reference voltage output by the bias circuit, but the reference voltage output by the bias circuit is easily affected by a load, so that the output of the addition circuit is unstable, and part of signals cannot be sampled by the microprocessor. Therefore, in order to solve this problem, the utility model provides a visual front end vibration perception device of intelligence distribution transformer guarantees that biasing circuit's output is stable, makes it not influenced by load change, further improves the sampling precision.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a visual front end vibration perception device of intelligence distribution transformer guarantees that biasing circuit's output is stable, makes it not influenced by load change, further improves the sampling precision.
The technical scheme of the utility model is realized like this: the utility model provides a visual front end vibration perception device of intelligence distribution transformer, it includes vibration sensor, signal processing circuit and microprocessor, and signal processing circuit includes: the circuit comprises an addition circuit, a bias circuit and a voltage stabilizing circuit;
the vibration sensor collects vibration signals of the distribution transformer and converts the vibration signals into voltage signals, the voltage signals are output to the inverting input end of the addition circuit, the bias circuit is electrically connected with the non-inverting input end of the addition circuit through the voltage stabilizing circuit, and the output end of the addition circuit is electrically connected with the analog input end of the microprocessor.
On the basis of the above technical solution, preferably, the voltage stabilizing circuit includes a voltage follower and an amplifier;
the bias circuit is electrically connected with the input end of the voltage follower, and the output end of the voltage follower is electrically connected with the non-inverting input end of the addition circuit through the amplifier.
On the basis of the above technical solution, preferably, the signal processing circuit further includes a clamping circuit;
the output end of the addition circuit is electrically connected with the analog input end of the microprocessor through the clamping circuit.
On the basis of the above technical solution, preferably, the bias circuit includes a power supply, a resistor R9 and a resistor R10;
the power supply is electrically connected with one end of the resistor R10 and the input end of the voltage follower through the resistor R9, and the other end of the resistor R10 is grounded.
On the basis of the above technical solution, preferably, the amplifier includes a resistor R11, a resistor R12, and an operational amplifier TL 072;
the output end of the voltage follower is electrically connected with a pin 2 of the operational amplifier TL072 through a resistor R11, a pin 3 of the operational amplifier TL072 is grounded, a resistor R12 is connected between the pin 2 of the operational amplifier TL072 and a pin 1 thereof in parallel, and the pin 1 of the operational amplifier TL072 is electrically connected with the non-inverting input end of the addition circuit.
On the basis of the above technical solution, preferably, the addition circuit includes an operational amplifier AD8605, a resistor R14, a diode D3, and a diode D4;
the vibration sensor is electrically connected with the inverting input end of the operational amplifier AD 8605; the output end of the voltage follower is electrically connected with the non-inverting input end of the operational amplifier AD8605 through an amplifier; the cathode of the diode D3 and the anode of the diode D4 are electrically connected with the non-inverting input end of the operational amplifier AD8605 respectively, and the anode of the diode D3 and the cathode of the diode D4 are electrically connected with the inverting input end of the operational amplifier AD8605 respectively; the resistor R14 is connected in parallel between the non-inverting input terminal of the operational amplifier AD8605 and the output terminal thereof, and the output terminal of the operational amplifier AD8605 is electrically connected to the analog input terminal of the microprocessor.
The utility model discloses a visual front end vibration perception device of intelligence distribution transformer has following beneficial effect for prior art:
(1) the output end of the bias circuit is provided with the voltage stabilizing circuit, so that the reference voltage signal output by the bias circuit is subjected to voltage stabilizing processing and is not changed along with the change of a load, the output stability of the bias circuit is ensured, and the sampling precision is improved;
(2) a voltage follower and an amplifier are arranged in the voltage stabilizing circuit, and the purposes of buffering and improving input impedance are realized through the voltage follower; when the load changes, the amplification factor of the amplifier is adjusted to ensure that the output signal of the bias circuit is stable and cannot change along with the change of the load, so that the direct current signal output by the bias circuit is constant;
(3) by arranging an addition circuit and lifting the 0V reference voltage of the alternating current signal output by the vibration sensor in a voltage lifting mode, the alternating current signal is conveniently collected by a microprocessor;
(4) the clamp circuit is arranged to limit the output of the addition circuit to be fixed in a certain range, so that the output voltage of the addition circuit is prevented from exceeding the voltage range of the pins of the microprocessor, and the effects of amplitude limiting and protection are achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a structural diagram of the intelligent distribution visual front-end vibration sensing device of the utility model;
fig. 2 is the utility model discloses signal processing circuit's circuit diagram among the visual front end vibration perception device of intelligence distribution transformer.
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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in fig. 1, the utility model discloses a visual front end vibration perception device of intelligence distribution transformer, it includes vibration sensor, signal processing circuit and microprocessor.
The vibration sensor is arranged on the surface of the distribution transformer, obtains a vibration signal of the distribution transformer in the operation process, and can monitor the change of an inner iron core and a winding of the distribution transformer by acquiring and analyzing the vibration signal of the box wall. In this embodiment, the type of the vibration sensor is not limited, and a specific type of the vibration sensor may be selected according to actual application. Generally, the output signal of the vibration sensor is an alternating current signal with the amplitude of 5V and alternating positive and negative.
Because the output signal of the vibration sensor is a +/-5V alternating current signal, the fluctuation is carried out by taking 0V as reference voltage, and the limitation of the limit value of a rear-stage operational amplifier causes that half-wave shapes smaller than 0V in the +/-5V alternating current signal cannot be amplified, in order to collect negative half-wave signals, an adding circuit is generally arranged in a signal processing circuit to carry out voltage lifting on the output signal of the vibration sensor, and the 0V reference voltage of the output alternating current signal of the vibration sensor is lifted so as to be collected by a microprocessor. In this embodiment, the signal processing circuit adds the ac signal to the reference voltage output by the bias circuit in a voltage-raising manner, so that the output signal of the vibration sensor is conveniently collected by the microprocessor. However, the reference voltage output by the bias circuit is easily affected by the load, so that the output of the bias circuit is unstable, the output of the addition circuit is unstable, and part of signals cannot be sampled by the microprocessor. Therefore, in order to solve the above problem, in this embodiment, a voltage stabilizing circuit is provided in the signal processing circuit, and the reference voltage signal output by the bias circuit is subjected to voltage stabilization processing so as not to change with load change, thereby ensuring the output stability of the bias circuit and improving the sampling accuracy. Preferably, as shown in fig. 1, in the present embodiment, the signal processing circuit includes: the circuit comprises an addition circuit, a bias circuit, a voltage stabilizing circuit and a clamping circuit; the vibration sensor is electrically connected with the inverting input end of the addition circuit, the bias circuit is electrically connected with the non-inverting input end of the addition circuit through the voltage stabilizing circuit, and the output end of the addition circuit is electrically connected with the analog input end of the microprocessor through the clamping circuit.
And the bias circuit is used for improving a reference voltage signal with stable amplitude for the non-inverting input end of the addition circuit. In this embodiment, as shown in fig. 2, the bias circuit includes a power supply, a resistor R9, and a resistor R10; the power supply is electrically connected with one end of the resistor R10 and the input end of the voltage stabilizing circuit through the resistor R9, and the other end of the resistor R10 is grounded. The power supply may be 5V, and the resistances of the resistor R9 and the resistor R10 are equal, so that in this embodiment, the bias circuit provides a reference voltage of 2.5V.
And the voltage stabilizing circuit is used for stabilizing the reference voltage signal output by the bias circuit, so that the reference voltage signal does not change along with the change of the load, the output stability of the bias circuit is ensured, and the sampling precision is improved. The voltage stabilizing circuit comprises a voltage follower and an amplifier; the bias circuit is electrically connected with the input end of the voltage follower, and the output end of the voltage follower is electrically connected with the non-inverting input end of the addition circuit through the amplifier. The voltage follower is used for improving input impedance and playing a role in buffering, and the effect of the embodiment can be realized by adopting the existing voltage follower circuit structure; the amplifier is used for adjusting the amplitude of the reference voltage, and when the load changes, the amplification factor of the amplifier is adjusted to ensure that the output signal of the bias circuit is stable and cannot change along with the change of the load. Preferably, the circuit structure of the amplifier is as shown in fig. 2, the amplification factor of the amplifier can be adjusted by adjusting the resistance values of the resistor R11 and the resistor R12, in this embodiment, the value of the resistor R12/R11 is 0.5, and therefore, the reference voltage of 2.5V is changed into a voltage signal of 1.25V after passing through the amplifier, and then the voltage signal is input to the non-inverting input terminal of the adding circuit.
And the addition circuit is used for carrying out voltage lifting on the output signal of the vibration sensor and lifting the 0V reference voltage of the alternating current signal output by the vibration sensor so as to be collected by the microprocessor. In this embodiment, the vibration sensor is electrically connected to the inverting input terminal of the adder circuit, the output terminal of the voltage follower is electrically connected to the non-inverting input terminal of the adder circuit through the amplifier, and the output terminal of the adder circuit is electrically connected to the analog input terminal of the microprocessor through the clamp circuit. Preferably, as shown in fig. 2, the addition circuit includes an operational amplifier AD8605, a resistor R14, a diode D3, and a diode D4; the vibration sensor is electrically connected with the inverting input end of the operational amplifier AD 8605; the output end of the voltage follower is electrically connected with the non-inverting input end of the operational amplifier AD8605 through an amplifier; the cathode of the diode D3 and the anode of the diode D4 are electrically connected with the non-inverting input end of the operational amplifier AD8605 respectively, and the anode of the diode D3 and the cathode of the diode D4 are electrically connected with the inverting input end of the operational amplifier AD8605 respectively; the resistor R14 is connected in parallel between the non-inverting input terminal of the operational amplifier AD8605 and the output terminal thereof, and the output terminal of the operational amplifier AD8605 is electrically connected to the analog input terminal of the microprocessor. The diode D3 and the diode D4 have an amplitude limiting function, limit the input signal amplitudes of the non-inverting input terminal and the inverting input terminal of the operational amplifier AD8605, and protect the input stage of the operational amplifier AD 8605. In this embodiment, a voltage signal of ± 5V is input to the inverting input terminal of the operational amplifier AD8605, a voltage signal of 1.25V is input to the non-inverting input terminal of the operational amplifier AD8605, and after being processed by the operational amplifier AD8605, a signal of-3.25 to 6.25V is finally output, so that the median of the signals of ± 5V output by the vibration sensor is increased to 1.25V.
The clamp circuit limits the output of the addition circuit to be fixed in a certain range, prevents the output voltage of the addition circuit from exceeding the voltage range of the pins of the microprocessor, and plays roles in amplitude limiting and protecting. As shown in fig. 2, the middle point of the connection between the diode D5 and the diode D6 serves as the output of the clamp circuit and is electrically connected to the analog input of the microprocessor.
And the microprocessor receives the direct current signal output by the addition circuit and performs analog-to-digital conversion processing. In this embodiment, the type of the microprocessor is not limited.
The working principle of the embodiment is as follows: the vibration sensor outputs a +/-5V alternating current signal to an inverting input end of the adding circuit, the biasing circuit outputs a 2.5V reference voltage, the reference voltage is buffered by the voltage follower and then input to the amplifier, the amplification factor of the amplifier is adjusted to enable the reference voltage to be changed into a 1.25V direct current voltage, the stabilized direct current voltage is output to a non-inverting input end of the adding circuit, the adding circuit adds the +/-5V alternating current signal output by the vibration sensor and the 1.25V reference voltage output by the biasing circuit to obtain a-3.25-6.25V direct current signal, the-3.25-6.25V direct current signal is limited by the clamping circuit and then input to an analog input end of the microprocessor, and the microprocessor realizes analog-to-digital conversion processing.
The beneficial effect of this embodiment does: the output end of the bias circuit is provided with the voltage stabilizing circuit, so that the reference voltage signal output by the bias circuit is subjected to voltage stabilizing processing and is not changed along with the change of a load, the output stability of the bias circuit is ensured, and the sampling precision is improved;
a voltage follower and an amplifier are arranged in the voltage stabilizing circuit, and the purposes of buffering and improving input impedance are realized through the voltage follower; when the load changes, the amplification factor of the amplifier is adjusted to ensure that the output signal of the bias circuit is stable and cannot change along with the change of the load, so that the direct current signal output by the bias circuit is constant;
by arranging an addition circuit and lifting the 0V reference voltage of the alternating current signal output by the vibration sensor in a voltage lifting mode, the alternating current signal is conveniently collected by a microprocessor;
the clamp circuit is arranged to limit the output of the addition circuit to be fixed in a certain range, so that the output voltage of the addition circuit is prevented from exceeding the voltage range of the pins of the microprocessor, and the effects of amplitude limiting and protection are achieved.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. Visual front end vibration perception device of intelligence distribution transformer, it includes vibration sensor, signal processing circuit and microprocessor, its characterized in that: the signal processing circuit includes: the circuit comprises an addition circuit, a bias circuit and a voltage stabilizing circuit;
the vibration sensor collects vibration signals of the distribution transformer and converts the vibration signals into voltage signals, the voltage signals are output to the inverting input end of the addition circuit, the bias circuit is electrically connected with the non-inverting input end of the addition circuit through the voltage stabilizing circuit, and the output end of the addition circuit is electrically connected with the analog input end of the microprocessor.
2. The intelligent distribution visual front-end vibration sensing device of claim 1, wherein: the voltage stabilizing circuit comprises a voltage follower and an amplifier;
the bias circuit is electrically connected with the input end of the voltage follower, and the output end of the voltage follower is electrically connected with the non-inverting input end of the addition circuit through the amplifier.
3. The intelligent distribution visual front-end vibration sensing device according to claim 1 or 2, characterized in that: the signal processing circuit further comprises a clamping circuit;
the output end of the addition circuit is electrically connected with the analog input end of the microprocessor through the clamping circuit.
4. The intelligent distribution visual front-end vibration sensing device of claim 2, wherein: the bias circuit comprises a power supply, a resistor R9 and a resistor R10;
the power supply is electrically connected with one end of the resistor R10 and the input end of the voltage follower through the resistor R9, and the other end of the resistor R10 is grounded.
5. The intelligent distribution visual front-end vibration sensing device of claim 4, wherein: the amplifier comprises a resistor R11, a resistor R12 and an operational amplifier TL 072;
the output end of the voltage follower is electrically connected with a pin 2 of the operational amplifier TL072 through a resistor R11, a pin 3 of the operational amplifier TL072 is grounded, a resistor R12 is connected between the pin 2 of the operational amplifier TL072 and a pin 1 thereof in parallel, and the pin 1 of the operational amplifier TL072 is electrically connected with the non-inverting input end of the addition circuit.
6. The intelligent distribution visual front-end vibration sensing device according to claim 4 or 2, characterized in that: the addition circuit includes an operational amplifier AD8605, a resistor R14, a diode D3, and a diode D4;
the vibration sensor is electrically connected with the inverting input end of the operational amplifier AD 8605; the output end of the voltage follower is electrically connected with the non-inverting input end of the operational amplifier AD8605 through an amplifier; the cathode of the diode D3 and the anode of the diode D4 are electrically connected with the non-inverting input end of the operational amplifier AD8605 respectively, and the anode of the diode D3 and the cathode of the diode D4 are electrically connected with the inverting input end of the operational amplifier AD8605 respectively; the resistor R14 is connected in parallel between the non-inverting input terminal of the operational amplifier AD8605 and the output terminal thereof, and the output terminal of the operational amplifier AD8605 is electrically connected to the analog input terminal of the microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120920986.XU CN215003926U (en) | 2021-04-29 | 2021-04-29 | Intelligent distribution transformer visual front-end vibration sensing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120920986.XU CN215003926U (en) | 2021-04-29 | 2021-04-29 | Intelligent distribution transformer visual front-end vibration sensing device |
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| Publication Number | Publication Date |
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| CN215003926U true CN215003926U (en) | 2021-12-03 |
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| CN202120920986.XU Active CN215003926U (en) | 2021-04-29 | 2021-04-29 | Intelligent distribution transformer visual front-end vibration sensing device |
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- 2021-04-29 CN CN202120920986.XU patent/CN215003926U/en active Active
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