CN220122614U - Phase-selecting and switching-on system of single-phase transformer - Google Patents
Phase-selecting and switching-on system of single-phase transformer Download PDFInfo
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- CN220122614U CN220122614U CN202321171422.6U CN202321171422U CN220122614U CN 220122614 U CN220122614 U CN 220122614U CN 202321171422 U CN202321171422 U CN 202321171422U CN 220122614 U CN220122614 U CN 220122614U
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Abstract
The utility model relates to a phase-selecting and switching-on system of a single-phase transformer, which comprises the following components: the output of the H bridge circuit is connected with the primary side of the single-phase transformer and is used for generating positive and negative bidirectional single pulse voltages; the battery pack is connected to two ends of the H bridge circuit; the output of the PWM driving circuit is connected with the IGBT of the H bridge circuit; the signal conditioning module is used for collecting response current, power grid voltage and pulse voltage, and performing integral operation on the power grid voltage to obtain a flux linkage per unit value; the residual magnetism conversion circuit linearly amplifies the response current to obtain residual magnetism; the controller sends out an H-bridge circuit driving signal to the PWM driving circuit and sends out a closing control signal according to the residual magnetic quantity and the flux linkage per unit value; and the output of the switching-on control module is connected with a switching-on relay connected with the single-phase transformer in series, and the switching-on relay is controlled to be closed according to a switching-on control signal so as to finish switching-on of the single-phase transformer. The utility model can effectively reduce the excitation surge current generated in the closing process of the no-load transformer and ensure the success rate of closing.
Description
Technical Field
The utility model belongs to the technical field of transformer closing, and particularly relates to a phase-selecting and closing system of a single-phase transformer.
Background
After the transformer is shut down (i.e., taken out of operation), residual magnetic flux remains inside the transformer core due to the hysteresis characteristics of the ferromagnetic material. Meanwhile, after various test operations (for example, direct current resistance measurement, etc.) are performed on the transformer, the residual magnetic flux in the transformer core is also changed. Due to the existence of the residual magnetic flux and the nonlinear characteristics of ferromagnetic materials, the magnetic flux inside the transformer core can be saturated when the transformer is closed under no load, so that extremely large excitation surge current is generated, the amplitude of the excitation surge current can be 6-8 times or more of the steady-state running current of the transformer, and the excitation surge current contains a large amount of even harmonics. Excitation surge current can cause misoperation of a relay protection device of the transformer to influence normal operation of the transformer, and meanwhile, abundant harmonic content can cause adverse effects on power grid quality and other equipment to influence safe and stable operation of the power grid.
Disclosure of Invention
The utility model aims at the problems in the prior art, and provides a single-phase transformer phase-selecting and switching-on system which combines residual magnetism measurement and phase-selecting and switching-on, so that exciting surge current generated in the switching-on process of an empty-load transformer can be effectively reduced, the switching-on success rate is ensured, and misoperation of a transformer relay protection device caused by overlarge exciting surge current is avoided.
In order to achieve the above object, the present utility model provides a phase-selecting and switching system of a single-phase transformer, comprising:
the output of the H bridge circuit is connected with the primary side of the single-phase transformer, and the H bridge circuit generates positive and negative bidirectional single-time pulse voltages to excite the primary side of the single-phase transformer to generate response current;
the battery pack is connected to two ends of the H-bridge circuit and supplies power to the H-bridge circuit;
the output of the PWM driving circuit is connected with the IGBT of the H bridge circuit so as to control the H bridge circuit to generate positive and negative bidirectional single pulse voltages;
the signal conditioning module is used for collecting the response current, the power grid voltage and the pulse voltage, and performing integral operation on the power grid voltage to obtain a flux linkage per unit value;
the residual magnetism conversion circuit linearly amplifies the response current to obtain residual magnetism;
the controller sends out an H-bridge circuit driving signal to the PWM driving circuit so that the PWM driving circuit controls the H-bridge circuit to work; and sending a closing control signal according to the residual magnetic quantity and the flux linkage per unit value;
and the output of the switching-on control module is connected with a switching-on relay connected with the single-phase transformer in series, the input of the switching-on control module is connected with the controller, and the switching-on relay is controlled to be closed according to a switching-on control signal sent by the controller so as to finish switching-on of the single-phase transformer.
In some embodiments, the signal conditioning module is provided with:
current sampling circuit with input end resistor R 1 The output end of the H bridge circuit is connected in series to acquire the response current;
the input end of the power grid voltage sampling processing circuit is connected in parallel with the primary side of the single-phase transformer so as to acquire power grid voltage, and the power grid voltage is amplified and operated to obtain a flux linkage per unit value;
and the input end of the pulse voltage sampling circuit is connected in parallel with the primary side of the single-phase transformer so as to collect pulse voltage.
In some embodiments, the current sampling circuit comprises:
resistor R 1 At both ends I thereof in +、I in -a series connection to the H-bridge circuit output to collect a response current;
a current detection amplifier having positive and negative input pins IN+ and IN-respectively connected to the resistor R 1 Is provided;
and the positive electrode input end of the first operational amplifier circuit is connected with the output pin OUT of the current detection amplifier, and the output end of the first operational amplifier circuit is connected with the positive electrode input end of the remanence conversion circuit.
In some embodiments, the grid voltage sampling processing circuit comprises:
the input end of the second operational amplification circuit is connected in parallel with the primary side of the single-phase transformer so as to collect power grid voltage and amplify the collected power grid voltage;
the input end of the third operational amplification circuit is connected with the output end of the second operational amplification circuit, and the third operational amplification circuit is used for carrying out integral operation on the grid voltage amplified by the second operational amplification circuit to obtain flux linkage information;
the input end of the fourth operational amplification circuit is connected with the output end of the third operational amplification circuit and is used for carrying out proportional operation on the flux linkage information to obtain a flux linkage per unit value;
and the input end of the voltage follower is connected with the output end of the fourth operational amplifier circuit, and the output end of the voltage follower is connected with the controller.
In some embodiments, the pulse voltage sampling circuit includes:
the input end L and the input end N of the voltage sensor are connected in parallel with the primary side of the single-phase transformer so as to collect pulse voltage;
and the input end of the fifth operational amplifier circuit is connected with the output end of the voltage sensor, and the output end of the fifth operational amplifier circuit is connected with the controller.
In some embodiments, the remanence switching circuit comprises:
the positive electrode input end U+ of the sixth operational amplifier circuit is connected with the output end of the current sampling circuit, and the negative electrode input end U-is grounded;
resistor R 2 One end of the output terminal is connected with the output terminal of the sixth operational amplifier circuit;
a seventh operational amplifier circuit having a positive input terminal and the resistor R 2 The other end of the capacitor is connected with the negative electrode input end of the capacitor, the output end of the capacitor is connected with the controller, and the positive electrode input end of the capacitor is also connected with a resistor R 3 One end of the resistor R 3 The other ends of (a) are respectively connected with a reference voltage V ref And capacitor C 1 Capacitance C 1 The other end of which is grounded.
In some embodiments, the system further comprises an upper computer, wherein the upper computer is in communication connection with the controller, and the upper computer gives an opening and closing instruction to the controller.
In some embodiments, the upper computer is provided with a display module, and the display module is used for displaying the power grid voltage, the response current, the flux linkage per unit value and the flux linkage direction sent to the upper computer by the controller.
Compared with the prior art, the utility model has the advantages and positive effects that:
(1) The phase-selecting and switching-on system of the single-phase transformer, provided by the utility model, combines the remanence measurement of external excitation and phase-selecting and switching-on, effectively reduces exciting inrush current in the switching-on process of an empty-load transformer, ensures the switching-on success rate, and avoids the problem of misoperation of a relay protection device caused by overlarge exciting inrush current.
(2) According to the phase-selecting and switching-on system of the single-phase transformer, disclosed by the utility model, the controller sends the switching-on and switching-off control instruction to the switching-on control module, and the switching-on control module controls the switching-on relay to switch on and off so as to realize the switching-off and switching-on operation of the transformer, and thus automatic control is realized.
(3) The phase-selecting and switching-on system of the single-phase transformer is further provided with the upper computer, on one hand, the residual magnetism measurement enabling signal and the switching-on command can be given through the controller, and the residual magnetism measurement enabling signal and the switching-on command can be given through the upper computer; on the other hand, the upper computer displays the power grid voltage, the response current, the flux linkage per unit value and the flux linkage direction which are sent to the upper computer by the controller through the display module, so that the suppression result of the exciting current after closing is checked.
Drawings
FIG. 1 is a schematic diagram of a phase-selecting and switching-on system of a single-phase transformer according to an embodiment of the present utility model;
FIG. 2 is a schematic circuit diagram of a current sampling circuit according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a second operational amplifier circuit according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram of a third operational amplifier circuit according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram of a fourth operational amplifier circuit according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of a voltage follower circuit according to an embodiment of the present utility model;
FIG. 7 is a schematic diagram of a voltage sensor circuit according to an embodiment of the utility model;
FIG. 8 is a schematic diagram of a fifth operational amplifier circuit according to an embodiment of the present utility model;
FIG. 9 is a schematic diagram of a sixth operational amplifier circuit according to an embodiment of the present utility model;
FIG. 10 is a schematic diagram of a seventh operational amplifier circuit according to an embodiment of the present utility model;
FIG. 11 is a flow chart of the switching operation of the single-phase transformer phase-selecting switching system according to the embodiment of the utility model.
In the figure, 1, a single-phase transformer, 2, an H bridge circuit, 3, a battery pack, 4, a PWM driving circuit, 5, a signal conditioning module, 6, a remanence converting circuit, 7, a controller, 8, a closing control module, 9, a current detection amplifier, 10, a first operational amplifier, 11, a second operational amplifier, 12, a third operational amplifier, 13, a fourth operational amplifier, 14, a voltage follower, 15, a voltage sensor, 16, a fifth operational amplifier, 17, a sixth operational amplifier, 18, a seventh operational amplifier, 19, a bidirectional rectifier diode, 20, an upper computer, 21 and a closing relay.
Detailed Description
The utility model will now be described in more detail by way of exemplary embodiments with reference to the accompanying drawings. It is to be understood that elements, structures, and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the term "connected" should be construed broadly, and for example, it may be a fixed connection, a removable connection, or an integral connection; can be directly connected, can be indirectly connected through an intermediate medium, and can also be communicated with the inside of two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Due to hysteresis characteristics of ferromagnetic materials, residual magnetism remains in the single-phase transformer core after the single-phase transformer is out of operation or various experimental operations are performed, and the residual magnetism is switched on when the single-phase transformer is in no-load state to cause excitation surge current, so that misoperation of a relay protection device of the unidirectional transformer is caused. In order to solve the problem, the utility model provides a phase-selecting and switching-on system of a single-phase transformer, which combines residual magnetism measurement and phase-selecting and switching-on, effectively reduces exciting inrush current in the switching-on process of an idle transformer, ensures switching-on success rate, and avoids the problem of misoperation of a relay protection device caused by overlarge exciting inrush current. The phase-selecting and switching system of the single-phase transformer is described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the phase-selecting and switching-on system of a single-phase transformer provided in this embodiment includes:
the output of the H-bridge circuit 2 is connected with the primary side of the single-phase transformer 1, and generates positive and negative bidirectional single-time pulse voltages to excite the primary side of the single-phase transformer 1 to generate response currents;
the battery pack 3 is connected to two ends of the H-bridge circuit 2 and supplies power to the H-bridge circuit 2;
the output of the PWM driving circuit 4 is connected with the IGBT of the H-bridge circuit 2 so as to control the H-bridge circuit 2 to generate positive and negative bidirectional single pulse voltages;
the signal conditioning module 5 is used for collecting the response current, the power grid voltage and the pulse voltage, and performing integral operation on the power grid voltage to obtain a flux linkage per unit value;
a residual magnetism conversion circuit 6 for linearly amplifying the response current to obtain a residual magnetism;
the controller 7 sends out an H-bridge circuit driving signal to the PWM driving circuit so that the PWM driving circuit controls the H-bridge circuit to work; and sending a closing control signal according to the residual magnetic quantity and the flux linkage per unit value;
and the output of the switching-on control module 8 is connected with a switching-on relay connected with the single-phase transformer in series, the input of the switching-on control module is connected with the controller, and the switching-on relay is controlled to be closed according to a switching-on control signal sent by the controller so as to finish switching-on of the single-phase transformer.
In some embodiments, the signal conditioning module is provided with:
current sampling circuit with input end resistor R 1 The output end of the H bridge circuit is connected in series to acquire the response current;
the input end of the power grid voltage sampling processing circuit is connected in parallel with the primary side of the single-phase transformer so as to acquire power grid voltage, and the power grid voltage is amplified and operated to obtain a flux linkage per unit value;
and the input end of the pulse voltage sampling circuit is connected in parallel with the primary side of the single-phase transformer so as to collect pulse voltage.
In some embodiments, referring to fig. 2, the current sampling circuit comprises:
resistor R1 with two ends I in +、I in -a series connection to the H-bridge circuit output;
the current detection amplifier 9 adopts an INA210AIDCKR chip, wherein the positive input pin IN+ and the negative input pin IN-of the current detection amplifier are respectively connected with two ends of the resistor R1, the V+ pin is connected with +5V, the GND pin is grounded, the REF pin is connected with +1.5V, and the +5V is grounded with a capacitor C between the ground 2 ；
And the positive electrode input end of the first operational amplifier circuit is connected with the output pin OUT of the current detection amplifier 9, and the output end of the first operational amplifier circuit is connected with the positive electrode input end of the remanence conversion circuit.
Specifically, with continued reference to fig. 2, the first operational amplifier circuit includes a first operational amplifier 10, and the first operational amplifier 10 is an 8-pin operational amplifier. The positive electrode input pin 2 of the first operational amplifier 10 passes through the resistor R 4 Connected to the output pin OUT of the current sense amplifier 9 and via a resistor R 6 And capacitor C 3 The composed parallel RC circuit is connected with the output pin 6 of the first operational amplifier 10. The negative input pin 3 of the first operational amplifier 10 passes through the resistor R 5 Grounded and pass through a resistor R 7 And capacitor C 4 The formed parallel RC circuit is connected with +1.5V. Pin 7 of the first operational amplifier 10 is connected with +15V and capacitor C respectively 5 Pin 4 is connected with-15V and capacitor C respectively 6 Capacitance C 5 And the other end of (C) and the capacitor C 6 The other end of which is connected to ground.
In some embodiments, the grid voltage sampling processing circuit comprises:
the input end of the second operational amplification circuit is connected in parallel with the primary side of the single-phase transformer so as to collect power grid voltage and amplify the collected power grid voltage;
the input end of the third operational amplification circuit is connected with the output end of the second operational amplification circuit, and the third operational amplification circuit is used for carrying out integral operation on the grid voltage amplified by the second operational amplification circuit to obtain flux linkage information;
the input end of the fourth operational amplification circuit is connected with the output end of the third operational amplification circuit and is used for carrying out proportional operation on the flux linkage information to obtain a flux linkage per unit value;
and the input end of the voltage follower is connected with the output end of the fourth operational amplifier circuit, and the output end of the voltage follower is connected with the controller.
The second operational amplification circuit collects power grid voltage and performs amplification treatment, the third operational amplification circuit performs integral operation on the power grid voltage amplified by the second operational amplification circuit to obtain flux linkage information, and the fourth operational amplification circuit performs proportional operation on the flux linkage information to obtain a flux linkage per unit value, so that a follow-up controller controls switching-on operation of the transformer according to the flux linkage per unit value. The voltage follower plays a role in following, so that the power grid voltage sampling processing circuit is isolated from the rear-stage circuit, and the front-stage circuit and the rear-stage circuit are protected.
Specifically, referring to fig. 3, the second operational amplifier circuit includes a second operational amplifier 11, and the second operational amplifier 11 is an 8-pin operational amplifier. The positive electrode input pin 2 of the second operational amplifier 11 passes through the resistor R 8 Is connected with the input end U+ of the second operational amplifier circuit and passes through a resistor R 9 And capacitor C 7 The formed parallel RC circuit is connected with the output pin 6 of the second operational amplifier 11. The negative input pin 3 of the second operational amplifier 11 passes through the resistor R 10 Is connected with the input end U-of the second operational amplifier circuit and passes through a resistor R 11 And capacitor C 8 The formed parallel RC circuit is grounded. Pin 7 of the second operational amplifier 11 is connected to +15V and pin 4 is connected to-15V.
Specifically, referring to fig. 4, the third operational amplifier circuit includes a third operational amplifier 12, and the third operational amplifier 12 is an 8-pin operational amplifier. The positive input pin 2 of the third operational amplifier 12 passes through the resistor R 12 Connected to the output pin 6 of the second operational amplifier and formed by a resistor R 13 Resistance R 14 Series connected and connected capacitor C 9 A series-parallel circuit formed by parallel connection is connected with the output pin 1 of the third operational amplifier 12, the resistor R 13 Resistance R 14 Via a resistor R 15 And capacitor C 10 The serial circuit is grounded. The negative input pin 3 of the third operational amplifier 12 passes through the resistor R 16 And (5) grounding. Pin 7 of the third operational amplifier 12 is connected with +15V, pin4-15V.
Specifically, referring to fig. 5, the fourth operational amplifier circuit includes a fourth operational amplifier 13, and the fourth operational amplifier 13 is an 8-pin operational amplifier. The positive input pin 6 of the fourth operational amplifier 13 passes through the resistor R 17 Connected to the output pin 1 of the third operational amplifier and formed by a resistor R 18 Resistance R 19 A first series circuit formed by series connection and a capacitor C 11 Resistance R 20 The parallel circuit formed by connecting the second series circuit in series is connected with the output pin 7 of the fourth operational amplifier 13. The negative input pin 3 of the fourth operational amplifier 13 passes through the resistor R 21 And (5) grounding.
Specifically, referring to FIG. 6, the voltage follower 14 is an 8-pin operational amplifier, the positive input (i.e., pin 3) of which passes through the capacitor C 12 Connected to the output pin 7 of the fourth operational amplifier 13 and passing through a resistor R 22 And (5) grounding. The negative input (i.e., pin 2) and pin 1 of voltage follower 14 are grounded. The output pin 6 of the voltage follower 14 is connected to pin 5. Pin 7 of the voltage follower 14 is connected to +15V and pin 4 is connected to-15V.
In some embodiments, referring to fig. 7, the pulse voltage sampling circuit includes:
the input end L and the input end N of the voltage sensor 15 are connected in parallel with the primary side of the single-phase transformer so as to collect pulse voltage;
and the input end of the fifth operational amplifier circuit is connected with the output end of the voltage sensor 15, and the output end of the fifth operational amplifier circuit is connected with the controller.
The voltage sensor measures pulse voltage, and the fifth operational amplifier circuit plays a role in following, so that the voltage sensor is isolated from the rear-stage circuit to protect the front-stage circuit and the rear-stage circuit.
Specifically, with continued reference to FIG. 7, the voltage sensor 15 employs an LV25-P chip, with the +HV terminal of the LV25-P chip passing through a resistor R 27 the-HV electron passing resistor R connected with the input end L, LV25-P chip of the voltage sensor 15 28 Is connected to the input N of the voltage sensor 15. The +VC pin of LV25-P chip is connected with +15V, and the-VC pin is connected with-15V.
Concrete embodimentsWith continued reference to fig. 7, the fifth operational amplifier circuit includes a fifth operational amplifier 16, and the fifth operational amplifier 16 is an 8-pin operational amplifier. The positive input pin 3 of the fifth operational amplifier 11 is connected with the output end of the voltage sensor (namely the M terminal of the LV25-P chip) and passes through a resistor R 29 And capacitor C 13 The formed parallel RC circuit is grounded. The negative input pin 2 of the fifth operational amplifier 16 is connected to the output pin 6 of said fifth operational amplifier. Pin 7 of the fifth operational amplifier 16 is connected with +15V and capacitor C respectively 14 Pin 4 is connected with-15V and capacitor C respectively 15 Capacitance C 14 And the other end of (C) and the capacitor C 15 The other end of which is connected to ground.
In some embodiments, referring to fig. 8, the remanence switching circuit comprises:
the positive electrode input end U+ of the sixth operational amplifier circuit is connected with the output end of the current sampling circuit, and the negative electrode input end U-is grounded;
resistor R 2 One end of the output terminal is connected with the output terminal of the sixth operational amplifier circuit;
a seventh operational amplifier circuit having a positive input terminal and the resistor R 2 The other end of the capacitor is connected with the negative electrode input end of the capacitor, the output end of the capacitor is connected with the controller, and the positive electrode input end of the capacitor is also connected with a resistor R 3 One end of the resistor R 3 The other ends of (a) are respectively connected with a reference voltage V ref And capacitor C 1 Capacitance C 1 The other end of which is grounded.
The sixth operational amplifier circuit and the seventh operational amplifier circuit are matched to combine a given proper reference voltage V ref The response current is converted into a residual magnetic quantity so that the controller can control the switching-on operation of the transformer according to the residual magnetic quantity.
Specifically, with continued reference to fig. 8, the sixth operational amplifier circuit includes a sixth operational amplifier 17, where the sixth operational amplifier 17 is an 8-pin operational amplifier. The negative input pin 2 of the sixth operational amplifier 17 passes through the resistor R 30 The positive electrode input end U+ of the sixth operational amplifier circuit is connected with the resistor R 31 And capacitor C 16 The formed parallel RC circuit is connected with the output pin 1 of the sixth operational amplifier 17. The positive input pin 3 of the sixth operational amplifier 17 passes through the resistor R 31 Connected to the negative input terminal U-of the sixth operational amplifier circuit and passing through a resistor R 32 And capacitor C 17 The formed parallel RC circuit is grounded. Pin 8 of the sixth operational amplifier 17 is connected to +15V and pin 4 is connected to-15V.
Specifically, with continued reference to FIG. 8, the seventh operational amplifier circuit includes a seventh operational amplifier 18, the seventh operational amplifier 18 being an 8-pin operational amplifier (e.g.:). The positive input terminal (i.e. positive input pin 5) of the seventh operational amplifier 18 and the resistor R 2 The negative input terminal (i.e. negative input pin 6) is connected to the output terminal (i.e. output pin 7), and the output terminal (i.e. output pin 7) is connected to the controller. The positive input terminal (i.e. positive input pin 5) of the seventh operational amplifier 18 is also connected to a resistor R 3 One end of the resistor R 3 The other ends of (a) are respectively connected with a reference voltage V ref And capacitor C 1 Capacitance C 1 The other end of which is grounded.
Specifically, with continued reference to FIG. 8, the output pin 7 of the seventh operational amplifier 18 is also connected to a Schottky diode (e.g., BAT54S, etc.) 19 having one end connected to +3V and one end connected to ground, limiting the amplifier output range.
In some embodiments, with continued reference to fig. 1, the closing system further includes an upper computer 20, where the upper computer 20 is communicatively connected to the controller 7, and the upper computer 20 gives an opening and closing command to the controller 7. The upper computer is arranged, so that not only can the residual magnetism measurement enabling signal and the switching-on and switching-off instruction be given out through the controller, but also the residual magnetism measurement enabling signal and the switching-on and switching-off instruction can be given out through the upper computer, and the control is diversified.
In some embodiments, the upper computer is provided with a display module, and the display module is used for displaying the power grid voltage, the response current, the flux linkage per unit value and the flux linkage direction sent to the upper computer by the controller, so as to check the suppression result of the exciting current after closing.
When the single-phase transformer is switched on and off, see fig. 11, the specific process is as follows:
and (3) brake separation operation: the controller gives out a switching-off signal, or the upper computer gives out a switching-off signal and sends the switching-off signal to the controller, the controller sends a switching-off instruction to the switching-on control module, and the switching-on control module controls the switching-on relay 21 to be switched off, so that switching-off operation of the single-phase transformer is completed.
Closing operation: (1) The primary side voltage and the primary side current of the single-phase transformer are collected through the signal conditioning module, and after the primary side voltage and the primary side current of the single-phase transformer are ensured to be 0, namely the single-phase transformer is completely powered off, the controller gives out a remanence measurement enabling signal, or the upper computer gives out the remanence measurement enabling signal and sends the remanence measurement enabling signal to the controller. (2) The controller gives a driving signal of the H-bridge circuit and generates the driving signal to the PWM driving circuit, and the PWM driving circuit controls the H-bridge circuit to generate a positive and negative bidirectional pulse voltage signal to excite the primary side of the single-phase transformer to generate response current. (3) The current sampling circuit collects response current and sends the response current to the remanence conversion module to convert the response current into remanence, and the remanence conversion module sends the remanence to the controller; the power grid voltage sampling processing circuit is used for collecting power grid voltage, performing amplification operation on the power grid voltage to obtain a flux linkage per unit value, and sending the flux linkage per unit value to the controller; the pulse voltage sampling circuit collects pulse voltages and sends the pulse voltages to the controller. (4) The controller judges whether the residual magnetic flux is equal to the flux linkage per unit value, if so, the controller sends a closing instruction to a closing control module, and the closing control module controls the closing relay 21 to be closed, so that the closing operation of the single-phase transformer is completed.
After the switching-on operation is finished, the signal conditioning module collects primary side current of the transformer after switching-on, and the primary side current is uploaded to the upper computer by the controller to display waveforms, so that the suppression effect of exciting inrush current after switching-on is checked.
The above-described embodiments are intended to illustrate the present utility model, not to limit it, and any modifications and variations made thereto are within the spirit of the utility model and the scope of the appended claims.
Claims (8)
1. A single-phase transformer phase-selecting and switching-on system, comprising:
the output of the H bridge circuit is connected with the primary side of the single-phase transformer, and the H bridge circuit generates positive and negative bidirectional single-time pulse voltages to excite the primary side of the single-phase transformer to generate response current;
the battery pack is connected to two ends of the H-bridge circuit and supplies power to the H-bridge circuit;
the output of the PWM driving circuit is connected with the IGBT of the H bridge circuit so as to control the H bridge circuit to generate positive and negative bidirectional single pulse voltages;
the signal conditioning module is used for collecting the response current, the power grid voltage and the pulse voltage, and performing integral operation on the power grid voltage to obtain a flux linkage per unit value;
the residual magnetism conversion circuit linearly amplifies the response current to obtain residual magnetism;
the controller sends out an H-bridge circuit driving signal to the PWM driving circuit so that the PWM driving circuit controls the H-bridge circuit to work; and sending a closing control signal according to the residual magnetic quantity and the flux linkage per unit value;
and the output of the switching-on control module is connected with a switching-on relay connected with the single-phase transformer in series, the input of the switching-on control module is connected with the controller, and the switching-on relay is controlled to be closed according to a switching-on control signal sent by the controller so as to finish switching-on of the single-phase transformer.
2. The phase-selecting and switching-on system of a single-phase transformer according to claim 1, wherein the signal conditioning module is provided with:
current sampling circuit with input end resistor R 1 The output end of the H bridge circuit is connected in series to collect the response current and convert the response current into voltage;
the input end of the power grid voltage sampling processing circuit is connected in parallel with the primary side of the single-phase transformer so as to acquire power grid voltage, and the power grid voltage is subjected to integral operation processing to obtain a flux linkage per unit value;
and the input end of the pulse voltage sampling circuit is connected in parallel with the primary side of the single-phase transformer so as to collect pulse voltage.
3. The single-phase transformer phase-selecting and switching-on system as claimed in claim 2, wherein said current sampling circuit comprises:
resistor R 1 At both ends I thereof in +、I in -a series connection to the H-bridge circuit output;
a current detection amplifier having positive and negative input pins IN+ and IN-respectively connected to the resistor R 1 Is provided;
and the positive electrode input end of the first operational amplifier circuit is connected with the output pin OUT of the current detection amplifier, and the output end of the first operational amplifier circuit is connected with the positive electrode input end of the remanence conversion circuit.
4. The single-phase transformer phase-selecting and switching-on system as claimed in claim 2, wherein the grid voltage sampling processing circuit comprises:
the input end of the second operational amplification circuit is connected in parallel with the primary side of the single-phase transformer so as to collect power grid voltage and amplify the collected power grid voltage;
the input end of the third operational amplification circuit is connected with the output end of the second operational amplification circuit, and the third operational amplification circuit is used for carrying out integral operation on the grid voltage amplified by the second operational amplification circuit to obtain flux linkage information;
the input end of the fourth operational amplification circuit is connected with the output end of the third operational amplification circuit and is used for carrying out proportional operation on the flux linkage information to obtain a flux linkage per unit value;
and the input end of the voltage follower is connected with the output end of the fourth operational amplifier circuit, and the output end of the voltage follower is connected with the controller.
5. The single-phase transformer phase-selecting and switching-on system as claimed in claim 2, wherein said pulse voltage sampling circuit comprises:
the input end L and the input end N of the voltage sensor are connected in parallel with the primary side of the single-phase transformer so as to collect pulse voltage;
and the input end of the fifth operational amplifier circuit is connected with the output end of the voltage sensor, and the output end of the fifth operational amplifier circuit is connected with the controller.
6. The single-phase transformer phase-selecting and switching-on system as claimed in claim 2, wherein said remanence switching circuit comprises:
the positive electrode input end U+ of the sixth operational amplifier circuit is connected with the output end of the current sampling circuit, and the negative electrode input end U-is grounded;
resistor R 2 One end of the output terminal is connected with the output terminal of the sixth operational amplifier circuit;
a seventh operational amplifier circuit having a positive input terminal and the resistor R 2 The other end of the capacitor is connected with the negative electrode input end of the capacitor, the output end of the capacitor is connected with the controller, and the positive electrode input end of the capacitor is also connected with a resistor R 3 One end of the resistor R 3 The other ends of (a) are respectively connected with a reference voltage V ref And capacitor C 1 Capacitance C 1 The other end of which is grounded.
7. The single-phase transformer phase-selecting and switching-on system as claimed in any one of claims 1 to 6, further comprising an upper computer, wherein the upper computer is in communication connection with the controller, and the upper computer gives an opening and closing command to the controller.
8. The single-phase transformer phase-selecting and switching-on system as claimed in claim 7, wherein the upper computer is provided with a display module for displaying the power grid voltage, the response current, the flux linkage per unit value and the flux linkage direction sent to the upper computer by the controller.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321171422.6U CN220122614U (en) | 2023-05-12 | 2023-05-12 | Phase-selecting and switching-on system of single-phase transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321171422.6U CN220122614U (en) | 2023-05-12 | 2023-05-12 | Phase-selecting and switching-on system of single-phase transformer |
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| Publication Number | Publication Date |
|---|---|
| CN220122614U true CN220122614U (en) | 2023-12-01 |
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| CN202321171422.6U Active CN220122614U (en) | 2023-05-12 | 2023-05-12 | Phase-selecting and switching-on system of single-phase transformer |
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| Country | Link |
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| CN (1) | CN220122614U (en) |
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