CN212695770U

CN212695770U - Transformer substation power grid load monitoring device

Info

Publication number: CN212695770U
Application number: CN202021857345.6U
Authority: CN
Inventors: 何伟
Original assignee: Zhongzhou Electric Co ltd
Current assignee: Zhongzhou Electric Co ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2021-03-12
Anticipated expiration: 2030-08-31

Abstract

The utility model discloses a transformer substation's electric wire netting load monitoring device, modulation transmitting circuit receives transformer substation's electric wire netting load information that the sensor gathered, get into the direct frequency modulation circuit frequency modulation of transistor after the amplifier is adjustable to amplify and send to the surveillance center through the transmitter after, a reserve channel of network conveying is provided, guarantee that the surveillance center can receive information when the network trouble, frequency stabilization circuit adopts triode Q2 to detect whether signal frequency is stable after the frequency modulation, when unstable, through converting into voltage, compare with the voltage that the reference frequency signal corresponds, the difference voltage feeds back to varactor's negative pole, play the effect of frequency stabilization, and compare the voltage that the reference frequency signal corresponds with the voltage that external interference frequency corresponds, when the difference voltage is low, triode Q5 switches on, +1V couples to operational amplifier AR1, adjust the amplitude of signal, and then adjust the frequency of the direct frequency modulation circuit of transistor, the anti-interference function is achieved, and the accuracy that the monitoring center can receive information can be guaranteed.

Description

Transformer substation power grid load monitoring device

Technical Field

The utility model relates to a transformer substation's electric wire netting technical field, especially transformer substation's electric wire netting load monitoring device.

Background

At present, a known substation power grid load monitoring device connects substation power grid load information collected by a sensor to a host, and then the information is transmitted to a remote monitoring center through a network (for example, an optical fiber network) by the host.

Disclosure of Invention

Not enough to prior art exists, the utility model aims at providing a transformer substation's electric wire netting load monitoring device, when effectual solved network fault, causes the problem that the information can not be received to the surveillance center.

The technical scheme includes that the frequency stabilizing circuit comprises a modulation transmitting circuit and a frequency stabilizing circuit, and is characterized in that the modulation transmitting circuit receives transformer substation power grid load information collected by a sensor, the transformer substation power grid load information is subjected to adjustable amplification by an amplifier taking an operational amplifier AR1 as a core, enters a transistor direct frequency modulation circuit taking a triode Q1 as a core, is subjected to frequency modulation and is transmitted to a monitoring center by a transmitter, the frequency stabilizing circuit adopts a triode Q2 to detect whether the frequency of a signal after frequency modulation is stable or not, is converted into voltage when the signal is unstable, enters a comparator taking an operational amplifier AR2 as a core and is compared with the voltage corresponding to a reference frequency signal, differential voltage is fed back to the cathode of a capacitance diode in the transistor direct frequency modulation circuit to play a role in frequency stabilization, and the comparator taking an operational amplifier AR3 as a core is adopted to compare the voltage corresponding to the reference frequency, when the difference voltage is low, the triode Q5 is conducted, the +1V is coupled to the amplifier with the operational amplifier AR1 as the core, the amplitude of the signal is adjusted, the frequency of the transistor direct frequency modulation circuit is further adjusted, and the functions of distinguishing the frequency transmitted by the transmitter from the interference frequency and resisting interference are achieved.

The utility model discloses when the network trouble, the transformer substation's electric wire netting load information of receiving sensor collection, get into transistor direct frequency modulation circuit frequency modulation after adjustable amplification and convey to the surveillance center through the transmitter, provide the reserve passageway of a network conveying, guarantee that the surveillance center can receive information when the network trouble, whether signal frequency is stable after adopting triode Q2 to detect the frequency modulation, when unstable, convert into voltage, compare with the voltage that the reference frequency signal corresponds, the difference voltage feeds back to the negative pole of the capacitance diode in the transistor direct frequency modulation circuit, play the effect of frequency stabilization, and adopt the comparator that operational amplifier AR3 is the core to compare the voltage that the reference frequency signal corresponds with the voltage that external disturbance frequency corresponds, when the difference voltage is low, triode Q5 switches on, +1V couples to the amplifier that operational amplifier AR1 is the core, the amplitude of the signal is adjusted, and then the frequency of the direct frequency modulation circuit of the transistor is adjusted, so that the functions of distinguishing the frequency transmitted by the transmitter from the interference frequency and resisting interference are achieved, and the accuracy of information received by the monitoring center can be ensured.

Drawings

Fig. 1 is a schematic diagram of the circuit connection of the present invention.

Detailed Description

The foregoing and other technical and scientific aspects, features and advantages of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying fig. 1. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.

Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

In the first embodiment, the substation power grid load monitoring device includes a modulation transmitting circuit and a frequency stabilization circuit, the modulation transmitting circuit receives the substation power grid load information collected by the sensor when the network fails (the modulation transmitting circuit can be used for testing the failure by a network tester and feeding back information for controlling switching, which is the prior art and is not described in detail herein), the information is input into a transistor direct frequency modulation circuit with a triode Q1 as a core after being adjustable and amplified by an amplifier with an operational amplifier AR1 as a core, the frequency is modulated and then is transmitted to a monitoring center by a transmitter, a standby channel for network transmission is provided, the monitoring center can be ensured to receive the information when the network fails, the frequency stabilization circuit adopts a triode Q2 to detect whether the frequency of the modulated signal is stable, when the modulated signal is unstable, the modulated signal is converted into a voltage, the voltage is input into a comparator with an operational amplifier AR2 as a core and is compared with the voltage corresponding to a reference frequency, the frequency stabilizing function is achieved, a comparator with an operational amplifier AR3 as a core is used for comparing the voltage corresponding to the reference frequency signal with the voltage corresponding to the external interference frequency, when the difference voltage is low, the triode Q5 is conducted, the +1V is coupled to the amplifier with the operational amplifier AR1 as the core, the amplitude of the signal is adjusted, the frequency of the transistor direct frequency modulation circuit is adjusted, the functions of distinguishing the frequency transmitted by the transmitter from the interference frequency and resisting interference are achieved, and the accuracy that the monitoring center can receive information is guaranteed.

In the second embodiment, on the basis of the first embodiment, the modulation and transmission circuit receives the load information of the substation power grid collected by the sensor, and the load information is adjustably amplified by an amplifier composed of an operational amplifier AR1, a resistor R0-a resistor R2, a potentiometer RP1, and a capacitor C1 (wherein the resistor R0 and the capacitor C1 play a role of RC series filtering, the resistor R1 and the capacitor C1 play a role of RC parallel filtering, the resistor R2 is a feedback resistor of the operational amplifier AR1, the potentiometer RP1 is an input resistor of the operational amplifier AR1, and the potentiometer RP1 is adjusted to change the amplification factor of the operational amplifier AR 1), and then the frequency is modulated by a transistor direct frequency modulation circuit composed of a triode Q1, a capacitor C1-a capacitor C1, a resistor R1-a resistor R1, an inductor L1 and an L1, a crystal oscillator Y1, and a varactor diode DC1, wherein the triode Q1 is a transistor, and the varactor diode Q1 is a transistor is a varactor diode is, the frequency of oscillation is controlled by a signal added to the cathode of a varactor DC 1), and then the oscillation is transmitted to a monitoring center through a transmitter, so as to provide a standby channel for network transmission, and ensure that the monitoring center can receive information in case of network failure, the device comprises a resistor R0, one end of a resistor R0 is connected with substation power grid load information collected by a sensor, the other end of a resistor R0 is respectively connected with one end of a grounding capacitor C1, one end of a grounding resistor R1 and the inverting input end of an operational amplifier AR1, the non-inverting input end of the operational amplifier AR1 is respectively connected with the adjustable end of a potentiometer RP1 and one end of a resistor R2, the left end of the potentiometer RP1 is connected with ground, the right end of the potentiometer RP1 is connected with +5V, the output end of the operational amplifier AR1 is respectively connected with the other end of a resistor R38 and one end of a capacitor C2, and the other end of a capacitor C2 is respectively connected with, One end of an inductor L4, the other end of the inductor L4 is connected with the negative electrode of a varactor DC1 and the left end of a crystal oscillator Y1, the right end of the crystal oscillator Y1 is connected with one end of a resistor R5, one end of a ground resistor R6, the base of a triode Q1 and one end of a capacitor C3, the emitter of the triode Q1 is connected with the other end of a capacitor C3 and one end of a ground resistor R7, the collector of the triode Q1 is connected with one end of an inductor L4, one end of a capacitor C4 and one end of a capacitor C5, the other end of the capacitor C5 is connected with the emitter, and the other end of the resistor R3, the other end of the resistor R5 and the other end of the inductor L4 are connected with +5V of a power.

In the third embodiment, on the basis of the first embodiment, the frequency stabilization circuit uses a transistor Q2 to detect whether the frequency of the frequency-modulated signal is stable or not, and when the frequency signal is unstable, that is, when the frequency signal is disturbed and the high-frequency signal is frequency-shifted, the transistor Q2 is turned on, the frequency-modulated signal is amplitude-limited by a diode D3 and then is added to a frequency-voltage conversion circuit consisting of the transistor Q3, the transistor Q4, the diode D2, an electrolytic capacitor E5, and a resistor R8 to be converted into a voltage signal (0-5V), the voltage signal enters the inverting input terminal of the operational amplifier AR2 to be compared with the voltage corresponding to the non-inverting input terminal reference frequency signal, the difference voltage is fed back to the negative electrode of a capacitance diode in the transistor direct frequency modulation circuit to play a role in frequency stabilization, and a comparator consisting of the operational amplifier AR3 and the resistor R9 is used to compare the voltage corresponding, and is given after frequency-voltage conversion, which is prior art and is not described in detail herein), when the differential voltage is low, the triode Q5 is turned on, +1V is coupled to the non-inverting input terminal of the operational amplifier AR1 and is coupled with the adjustable terminal voltage of the potentiometer to adjust the amplitude of signal amplification of the operational amplifier AR1, and further adjust the frequency of the direct frequency modulation circuit of the transistor, so as to distinguish the frequency emitted by the emitter from the interference frequency and to achieve the anti-interference effect, the circuit comprises a triode Q2, the base of the triode Q2 is connected to one end of a capacitor C5, the collector of the triode Q2 is connected to the other end of the capacitor C5 through a capacitor C6, the emitter of the triode Q2 is connected to the anode of a diode D3, the cathode of the diode D3 is connected to the base of a triode Q3, the collector of the triode Q3 is connected to the cathode of an electrolytic capacitor E5 and one end of a resistor R8, the anode of the electrolytic capacitor E5 is connected with the anode of the diode D2 and the emitter of the triode Q4, the base of the triode Q4, the cathode of the diode D2 and the emitter of the triode Q3 are connected with the ground, the collector of the triode Q4 is connected with the non-inverting input end of the operational amplifier, the inverting input end of the operational amplifier AR2, one end of the resistor R9, the inverting input end of the operational amplifier AR3 and one end of the resistor R10 are connected with the voltage corresponding to the reference frequency signal, the output end of the operational amplifier AR2 and the other end of the resistor R9 are connected with the cathode of the varactor DC1, the non-inverting input end of the operational amplifier AR3 is connected with the voltage corresponding to the external interference frequency, the output end of the operational amplifier AR3 and the other end of the resistor R10 are connected with one end of the ground resistor R12 and the base of the triode Q5, the emitter of the triode Q5 is connected with the power supply +, The inverting input end of the operational amplifier AR3, the other end of the resistor R13 is connected with the adjustable end of the potentiometer RP 1.

When the utility model is used, the modulation transmitting circuit is in network failure, the transformer substation power grid load information collected by the receiving sensor enters the transistor direct frequency modulation circuit after adjustable amplification by the amplifier and is transmitted to the monitoring center through the transmitter after frequency modulation, a standby channel for network transmission is provided, the monitoring center can be ensured to receive the information when the network is in failure, the frequency stabilizing circuit adopts the triode Q2 to detect whether the signal frequency is stable after frequency modulation, when the frequency signal is unstable, namely when the frequency signal is interfered, the triode Q2 is conducted, the signal after frequency modulation is subjected to amplitude limiting and is converted into a voltage signal, the voltage corresponding to the reference frequency signal is compared, the difference voltage is fed back to the cathode of the capacitance diode in the transistor direct frequency modulation circuit to play a role of frequency stabilization, and the comparator consisting of the operational amplifier AR3 and the resistor R9 is adopted to compare the voltage corresponding to the reference frequency signal with the voltage corresponding to the external interference, when the differential voltage is low, the triode Q5 is conducted, the +1V is coupled to the non-inverting input end of the operational amplifier AR1 and coupled with the adjustable end voltage of the potentiometer, so that the signal amplification amplitude of the operational amplifier AR1 is adjusted, the frequency of the direct frequency modulation circuit of the transistor is adjusted, the functions of distinguishing the frequency transmitted by the transmitter from the interference frequency and resisting interference are achieved, and the accuracy that the monitoring center can receive information can be guaranteed.

Claims

1. The transformer substation power grid load monitoring device comprises a modulation transmitting circuit and a frequency stabilization circuit, and is characterized in that the modulation transmitting circuit receives transformer substation power grid load information collected by a sensor, the transformer substation power grid load information is subjected to adjustable amplification by an amplifier taking an operational amplifier AR1 as a core, enters a transistor direct frequency modulation circuit taking a triode Q1 as a core, is subjected to frequency modulation and is transmitted to a monitoring center by a transmitter, the frequency stabilization circuit adopts a triode Q2 to detect whether the frequency of a signal after frequency modulation is stable or not, is converted into voltage when the signal is unstable, enters a comparator taking an operational amplifier AR2 as a core and is compared with the voltage corresponding to a reference frequency signal, differential voltage is fed back to the cathode of a capacitance diode in the transistor direct frequency modulation circuit to play a role in frequency stabilization, and the comparator taking an operational amplifier AR3 as a core is adopted to compare the voltage corresponding to the reference frequency, when the difference voltage is low, the triode Q5 is conducted, the +1V is coupled to the amplifier with the operational amplifier AR1 as the core, the amplitude of the signal is adjusted, the frequency of the transistor direct frequency modulation circuit is further adjusted, and the functions of distinguishing the frequency transmitted by the transmitter from the interference frequency and resisting interference are achieved.

2. The substation power grid load monitoring device according to claim 1, wherein the modulation transmitting circuit comprises a resistor R0, one end of the resistor R0 is connected with the substation power grid load information collected by the sensor, the other end of the resistor R0 is connected with one end of a grounding capacitor C1, one end of a grounding resistor R1 and the reverse-phase input end of an operational amplifier AR1 respectively, the non-inverting input end of the operational amplifier AR1 is connected with the adjustable end of a potentiometer RP1 and one end of a resistor R2 respectively, the left end of the potentiometer RP1 is connected with the ground, the right end of the potentiometer RP1 is connected with +5V, the output end of the operational amplifier AR1 is connected with the other end of a resistor R2 and one end of a capacitor C2 respectively, the other end of a capacitor C2 is connected with one end of a resistor R3, one end of a grounding resistor R4 and one end of an inductor L4 respectively, the other end of an inductor L4 is connected with the negative electrode of a varactor DC, the right end of the crystal oscillator Y1 is respectively connected with one end of a resistor R5, one end of a grounding resistor R6, the base of a triode Q1 and one end of a capacitor C3, the emitter of the triode Q1 is respectively connected with the other end of a capacitor C3 and one end of a grounding resistor R7, the collector of the triode Q1 is respectively connected with one end of an inductor L4, one end of the capacitor C4 and one end of a capacitor C5, the other end of the capacitor C5 is connected with the emitter, and the other end of the resistor R3, the other end of the resistor R5 and the other end of the capacitor C4 of the inductor L4 are all connected with +5V of a power.

3. The substation power grid load monitoring device according to claim 1, wherein the frequency stabilization circuit comprises a transistor Q2, a base of a transistor Q2 is connected to one end of a capacitor C5, a collector of a transistor Q2 is connected to the other end of a capacitor C5 through a capacitor C6, an emitter of a transistor Q2 is connected to an anode of a diode D3, a cathode of a diode D3 is connected to a base of a transistor Q3, a collector of a transistor Q3 is connected to a cathode of an electrolytic capacitor E5 and one end of a resistor R8, the other end of a resistor R8 is connected to +5V, an anode of an electrolytic capacitor E5 is connected to an anode of a diode D2 and an emitter of a transistor Q4, a base of a transistor Q4, a cathode of a diode D2, an emitter of a transistor Q3 is connected to ground, a collector of a transistor Q4 is connected to a non-inverting input end of an operational amplifier AR2, an end of a resistor R9, The inverting input end of the operational amplifier AR3 and one end of the resistor R10 are connected with a voltage corresponding to a reference frequency signal, the output end of the operational amplifier AR2 and the other end of the resistor R9 are connected with the negative electrode of the varactor diode DC1, the non-inverting input end of the operational amplifier AR3 is connected with a voltage corresponding to an external interference frequency, the output end of the operational amplifier AR3 and the other end of the resistor R10 are connected with one end of the grounding resistor R12 and the base of the triode Q5, the emitter of the triode Q5 is connected with a power supply +1V through the resistor R11, the collector of the triode Q5 is connected with one end of the resistor R13 and the inverting input end of the operational amplifier AR3, and the other end of the resistor R13.