CN211785761U - Transformer substation secondary circuit state monitoring device - Google Patents
Transformer substation secondary circuit state monitoring device Download PDFInfo
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- CN211785761U CN211785761U CN202020180335.7U CN202020180335U CN211785761U CN 211785761 U CN211785761 U CN 211785761U CN 202020180335 U CN202020180335 U CN 202020180335U CN 211785761 U CN211785761 U CN 211785761U
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Abstract
The utility model relates to a secondary circuit state monitoring devices of transformer substation, including central processing module, voltage measurement unit, current measurement unit, return circuit diagnosis unit, admittance phase angle unit are connected with central processing module electricity respectively. The utility model discloses use voltage measurement unit, current measurement unit to measure transformer substation's secondary circuit's voltage, electric current, send measured voltage and electric current to admittance phase angle module through central processing module, obtain the admittance amplitude and the phase amplitude of secondary circuit to use return circuit diagnostic unit to monitor the diagnosis to the short circuit of secondary circuit and the condition of opening circuit, carry out omnidirectional state monitoring to transformer substation's secondary circuit.
Description
Technical Field
The utility model relates to a secondary circuit monitoring technology field, in particular to secondary circuit state monitoring device of transformer substation.
Background
In a substation power system, metering equipment, such as an electric energy meter, is required to monitor the system state, and because the metering equipment is not convenient to access the system, a mutual inductor and the metering equipment are generally adopted to form a loop, and an electric energy parameter of the system is measured, and the loop also becomes a secondary loop. However, when a fault or a wiring error occurs in the secondary circuit, a disconnection or a short circuit may occur, and thus, the state of the system cannot be accurately monitored, and therefore, monitoring of the state of the secondary circuit is also important.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a purpose is not enough solving existing among the prior art, provides a secondary circuit state monitoring devices of transformer substation to the state to the secondary circuit carries out accurate monitoring.
In order to realize the purpose of the utility model, the embodiment of the utility model provides a following technical scheme:
the transformer substation secondary circuit state monitoring device comprises a central processing module, a voltage measuring unit, a current measuring unit, a circuit diagnosis unit and an admittance phase angle unit, wherein the voltage measuring unit, the current measuring unit, the circuit diagnosis unit and the admittance phase angle unit are respectively and electrically connected with the central processing module.
For better realization the utility model discloses, voltage measurement unit includes voltage acquisition circuit, voltage discrimination circuit, voltage acquisition circuit's output is connected with voltage discrimination circuit's input electricity, voltage discrimination circuit's output is connected with central processing module electricity.
In order to better realize the utility model, the voltage acquisition circuit comprises an isolation amplifier U1, the voltage discrimination circuit comprises an operational amplifier U1A and an operational amplifier U1B, the isolation amplifier U1 is HCPL7800, the operational amplifier U1A is LM358, and the operational amplifier U1B is LM 358; the output end of the isolation amplifier U1 is electrically connected with the input end of the operational amplifier U1A, the output end of the operational amplifier U1A is electrically connected with the input end of the operational amplifier U1B, and the output end of the operational amplifier U1B is electrically connected with the central processing module.
For better realization the utility model discloses, the current measurement unit includes current acquisition circuit, current amplification circuit, current acquisition circuit's output is connected with current amplification circuit's input electricity, current amplification circuit's output is connected with central processing module electricity.
In order to better realize the utility model, the current collecting circuit comprises a current transformer CT, the current amplifying circuit comprises an amplifier U2A, the model of the current transformer CT is TR3-01, and the model of the amplifier U2A is TL 072; the output end of the current transformer CT is electrically connected with the input end of the operational amplifier U2A, and the output end of the operational amplifier U2A is electrically connected with the central processing module.
In order to better realize the utility model, the admittance phase angle module comprises a logarithmic detector U2, and the logarithmic detector U2 is AD 8302; the input end of the logarithmic detector U2 is electrically connected with the central processing module, and the output end of the logarithmic detector U2 outputs admittance amplitude and phase amplitude.
In order to better realize the utility model discloses, the loop diagnosis unit includes current-limiting switch circuit, return circuit amplifier circuit, comparison circuit, voltage stabilizing circuit, current-limiting switch circuit's output is connected with return circuit amplifier circuit's input, central processing module electricity respectively, return circuit amplifier circuit's output, voltage stabilizing circuit's output are connected with comparison circuit electricity respectively, comparison circuit's output and central processing unit electricity are connected.
In order to better realize the utility model, the current limiting switch circuit comprises a current limiting switch chip U3, the loop amplification circuit comprises an amplifier U4, the comparison circuit comprises a comparator U5, the voltage stabilizing circuit comprises a voltage stabilizing chip U6, the model of the current limiting switch chip U3 is MAX4917AEUK + T, the model of the amplifier U4 is MAX407LAUA, the model of the comparator U5 is MAX999EUK-T, the model of the voltage stabilizing chip U6 is ADP1150 AUZ-33-R7; the output end of the current-limiting switch chip U3 is electrically connected with the input end of an amplifier U4, the output end of an amplifier U4 and the output end of a voltage-stabilizing chip U6 are respectively and electrically connected with the input end of a comparator U5, and the output end of a comparator U5 is electrically connected with the central processing module.
In order to better realize the utility model discloses, still include audible-visual alarm unit, the display element who is connected with central processing module electricity respectively.
For better realization the utility model discloses, central processing module chooses the model for use to be STM 32's singlechip.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses use voltage measurement unit, current measurement unit to measure transformer substation's secondary circuit's voltage, electric current, send measured voltage and electric current to admittance phase angle module through central processing module, obtain the admittance amplitude and the phase amplitude of secondary circuit to use return circuit diagnostic unit to monitor the diagnosis to the short circuit of secondary circuit and the condition of opening circuit, carry out omnidirectional state monitoring to transformer substation's secondary circuit.
(2) The utility model discloses in voltage measurement unit uses HCPL7800 and LM358 to constitute difference operation amplifier circuit and chebyshev type low pass filter, keep apart the secondary circuit, when the secondary circuit breaks down, voltage measurement unit can not receive the influence, utilize carrier signal and the filtering of various electromagnetic interference signals on the secondary circuit of carrier amplifier and chebyshev type low pass filter that cut-off frequency f0 ═ 201Hz, under the condition that satisfies voltage measurement precision, can also guarantee to keep apart requirement and low-cost demand.
(3) The utility model discloses using under the condition that secondary circuit was gathered to current transformer CT, the current signal who uses current amplification circuit to gather current transformer CT enlargies, and current acquisition circuit under the condition that can accurate measurement secondary circuit electric current, its structure is still simple, cost is also cheap.
(4) The utility model discloses with 1.6 KHz's pilot frequency signal test secondary circuit's admittance and impedance, be difficult to receive the on-the-spot 50Hz power frequency signal interference of transformer substation for the test result is more accurate.
(5) The utility model discloses when measuring secondary circuit's electric current or voltage are unusual, use return circuit diagnostic circuit to judge whether secondary circuit sends the short circuit or the open circuit condition to show the diagnosis result, be convenient for maintain.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and other relevant drawings can be obtained from the drawings without inventive efforts for those skilled in the art.
FIG. 1 is a block diagram of the device module of the present invention;
FIG. 2 is a block diagram of a voltage measuring unit module according to the present invention;
FIG. 3 is a block diagram of a current measuring unit module according to the present invention;
FIG. 4 is a schematic circuit diagram of the voltage measuring unit of the present invention;
FIG. 5 is a schematic circuit diagram of the current measuring unit of the present invention;
FIG. 6 is a schematic circuit diagram of an admittance phase angle module of the present invention;
FIG. 7 is a block diagram of a loop diagnostic unit module according to the present invention;
fig. 8 is a schematic circuit diagram of the loop diagnosis unit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in 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. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. In addition to the embodiments of the present invention, all other embodiments obtained by those skilled in the art without any creative work belong to the scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Example 1:
the utility model discloses a following technical scheme realizes, as shown in FIG. 1, provides transformer substation's secondary circuit state monitoring devices, including central processing module, voltage measurement unit, current measurement unit, return circuit diagnosis unit, admittance phase angle unit are connected with central processing module electricity respectively.
The utility model discloses use voltage measurement unit, current measurement unit to measure transformer substation's secondary circuit's voltage, electric current, send measured voltage and electric current to admittance phase angle module through central processing module, obtain the admittance amplitude and the phase amplitude of secondary circuit to use return circuit diagnostic unit to monitor the diagnosis to the short circuit of secondary circuit and the condition of opening circuit, carry out omnidirectional state monitoring to transformer substation's secondary circuit.
In detail respectively, the singlechip that the model was STM32F106 is selected for use as central processing module to this embodiment, nevertheless the utility model discloses be not limited to the central processing module of this model, as long as can accomplish required function can.
As shown in fig. 2, the voltage measurement unit includes a voltage acquisition circuit and a voltage determination circuit, an output terminal of the voltage acquisition circuit is electrically connected to an input terminal of the voltage determination circuit, and an output terminal of the voltage determination circuit is electrically connected to the central processing module.
As shown in fig. 4, the voltage acquisition circuit includes an isolation amplifier U1, a resistor R1-a resistor R3, a capacitor C1, and a capacitor C1, the voltage determination circuit includes an operational amplifier U1A, an operational amplifier U1B, a resistor R4-a resistor R8, a capacitor C3, and a capacitor C4, the isolation amplifier U1 is of HCPL7800, the operational amplifier U1A is of LM358, and the operational amplifier U1B is of LM 358. One end of the resistor R1 is connected with one end of a secondary circuit, a VIN-pin of the isolation amplifier U1 is connected with the other end of the secondary circuit, the other end of the resistor R1 is respectively connected with one end of the capacitor C2 and a VIN + pin of the isolation amplifier U1, the other end of the capacitor C2 is grounded, a VCC1 pin of the isolation amplifier U1 is connected with one end of the capacitor C1, and the other end of the capacitor C1 is grounded; a VOUT + pin of an isolation amplifier U1 is connected with one end of a resistor R2, a VOUT-pin of an isolation amplifier U1 is connected with one end of a resistor R3, the other end of the resistor R2 is connected with an inverting input end of an operational amplifier U1A and one end of a resistor R4, the other end of the resistor R3 is connected with a non-inverting input end of an operational amplifier U1A and one end of a resistor R5, the other end of the resistor R5 is grounded, an output end of the operational amplifier U1A is connected with the other end of a resistor R4 and one end of a resistor R6, the other end of the resistor R6 is connected with one end of a resistor R7, one end of a resistor R8 and one end of a capacitor C3, and the other end of a capacitor C; the other end of the resistor R8 is connected with one end of the capacitor C4 and the inverting input end of the operational amplifier U1B, the other end of the resistor R7 is connected with the other end of the capacitor C4 and the output end of the operational amplifier U1B, the non-inverting input end of the operational amplifier U1B is grounded, and the output end of the operational amplifier U1B is also connected with the P0.1 pin of the single chip microcomputer.
The voltage measurement unit uses HCPL7800 and LM358 to form a differential operational amplifier circuit and a Chebyshev-type low-pass filter to isolate a secondary circuit, when the secondary circuit breaks down, the voltage measurement unit is not affected, a carrier signal and various electromagnetic interference signals on the secondary circuit are filtered by using an operational amplifier with cut-off frequency f0 being 201Hz and the Chebyshev-type low-pass filter, and under the condition of meeting voltage measurement accuracy, the isolation requirement and the low-cost requirement can be further ensured. The voltage measuring unit sends the acquired voltage of the secondary circuit to the central processing module in the form of an electric signal, and if the voltage value is within a normal range, the voltage state in the secondary circuit is good. If the voltage value is not in the normal range, even if the voltage value is zero, the loop diagnosis unit is used for diagnosing and monitoring to judge whether the secondary loop has an open circuit or a short circuit.
As shown in fig. 3, the current measuring unit includes a current collecting circuit and a current amplifying circuit, an output end of the current collecting circuit is electrically connected to an input end of the current amplifying circuit, and an output end of the current amplifying circuit is electrically connected to the central processing module.
As shown in fig. 5, the current collection circuit includes a current transformer CT, a resistor R9, a resistor R10, a capacitor C5, and a diode D1, the current amplification circuit includes an operational amplifier U2A and resistors R11 to R13, the model of the current transformer CT is TR3-01, and the model of the operational amplifier U2A is TL 072. One end of a current transformer CT is respectively connected with the anode of a diode D1 and one end of a resistor R9, the cathode of a diode D1 is respectively connected with one end of a capacitor C5, one end of a resistor R10 and one end of a resistor R11, the other end of the current transformer CT, the other end of a resistor R9, the other end of a capacitor C5 and the other end of a resistor R10 are all grounded, the other end of a resistor R11 is respectively connected with the reverse input end of an operational amplifier U2A and one end of a resistor R12, the positive phase input end of the operational amplifier U2A is grounded, the output end of the operational amplifier U2A is respectively connected with the other end of the resistor R12 and one end of the resistor R13, and the other end of the resistor R13 is connected with a P0.
The current transformer is generally composed of a closed iron core and a winding, the number of turns of a primary side winding of the current transformer is small, and the primary side winding is connected in series in a current line to be measured, so that all current in the line always flows through the current transformer, but a secondary circuit of a transformer substation is closed all the time, so that impedance is small, and the working state of the current transformer is close to an open circuit, so that the current in the secondary circuit cannot be accurately measured. Therefore the utility model discloses using under the condition that secondary circuit was gathered to current transformer CT, the current signal who uses current amplification circuit to gather current transformer CT enlargies, and current acquisition circuit under the condition that can accurate measurement secondary circuit electric current, its structure is still simple, cost is also cheap. The current measuring unit sends the acquired current of the secondary circuit to the central processing module in the form of an electric signal, if the current value is within a normal range, the current state in the secondary circuit is good, and it should be noted that the current value in the normal range is determined by the field situation, so the current measuring unit is not limited herein. If the current value is not in the normal range, even if the current value is zero, the loop diagnosis unit is used for diagnosing and monitoring to judge whether the secondary loop has an open circuit or a short circuit.
As shown in fig. 6, the admittance phase angle module includes a logarithmic detector U2, a resistor R14-a resistor R16, and a capacitor C6-a capacitor C11, and the logarithmic detector U2 is AD 8302. An INPA pin of the logarithmic detector U2 is connected with one end of a capacitor C6, one end of a capacitor C6 and one end of a resistor R14 are connected with a P1.0 pin of the singlechip, an OFSA pin of the logarithmic detector U2 is connected with one end of a capacitor C7, an OFSB pin of a logarithmic detector U2 is connected with one end of a capacitor C8, an INPB pin of the logarithmic detector U2 is connected with one end of a capacitor C9, the other end of the capacitor C9 and one end of a resistor R15 are connected with a P1.1 pin of the singlechip, a voltage value signal collected by a voltage measuring unit and sent by the central processing module in the form of an electric signal, the other end of the resistor R14, the other end of the capacitor C7, the other end of the capacitor C8 and the other end of the resistor R15 are all grounded, an MFLT pin of the detector U2 is connected with one end of the capacitor C10, and the other end of the capacitor C10 is grounded, the conductance amplitude YP-VAL of the secondary loop is output after the VMAG pin and the MSET pin of the logarithmic detector U2 are connected, the VREF pin of the logarithmic detector U2 is connected with one end of a resistor R16, the other end of the resistor R16 is grounded, the phase amplitude YP-PH of the secondary loop is output after the PSET pin and the VPHS pin of the logarithmic detector U2 are connected, the PFLT pin of the logarithmic detector U2 is connected with one end of a capacitor C11, and the other end of the capacitor C11 is grounded.
When the voltage and current states of the secondary loop are good, the central processing module sends the collected current signal V-I and the collected voltage signal V-V to the logarithmic detector U2, sets a pilot frequency signal of 1.6KHz in the logarithmic detector U2, and tests the current signal V-I and the voltage signal V-V by using the logarithmic detector U2 to obtain the admittance amplitude YP-VAL and the phase amplitude YP-PH of the secondary loop. Because the on-the-spot power frequency signal of transformer substation is very strong, if use 50Hz power frequency signal test secondary circuit's admittance and anti-the case that hinders, the admittance and the anti-result that hinders of surveying receive 50Hz power frequency signal interference easily, consequently the utility model discloses with 1.6 KHz's pilot frequency signal test secondary circuit's admittance and impedance, just be difficult to receive 50Hz power frequency signal interference for the test result is more accurate.
As shown in fig. 7, the loop diagnosis unit includes a current-limiting switch circuit, a loop amplifier circuit, a comparison circuit, and a voltage regulator circuit, wherein an output terminal of the current-limiting switch circuit is electrically connected to an input terminal of the loop amplifier circuit and the central processing module, an output terminal of the loop amplifier circuit and an output terminal of the voltage regulator circuit are electrically connected to the comparison circuit, and an output terminal of the comparison circuit is electrically connected to the central processing unit.
As shown in fig. 8, the current-limiting switch circuit includes a current-limiting switch chip U3, a resistor R17, a resistor R18, a capacitor C12, and a capacitor C13, the loop amplification circuit includes an amplifier U4, a resistor R19, a resistor R20, and a capacitor C14, the comparison circuit includes a comparator U5 and a capacitor C15, the voltage stabilizing circuit includes a voltage stabilizing chip U6, a resistor R21, a resistor R22, a capacitor C16, and a capacitor C17, the current-limiting switch chip U3 is MAX4917AEUK + T, the amplifier U4 is MAX407LAUA, the comparator U5 is MAX999EUK-T, and the voltage stabilizing chip U6 is ADP1150 AUZ-33-R7. An ON pin of the current limiting switch chip U3 is connected with one end of a resistor R17, an IN pin of the current limiting switch chip U3, the other end of the resistor R17 and one end of a capacitor C12 are connected with a P2.0 pin of the single chip microcomputer and are connected with a current Iin of a secondary loop, and a FLAG pin of the current limiting switch chip U3 is connected with a P2.2 pin of the single chip microcomputer; an OUT pin of a current-limiting switch chip U3 is connected with one end of a resistor R18, one end of a capacitor C13 and an RS + pin of an amplifier U4 respectively, the other end of a capacitor C13 is grounded, the other end of a resistor R18 is connected with an RS-pin of an amplifier U4, an SHDN pin of an amplifier U4 and one end of a capacitor C14 are connected with a preset voltage Vf, the other end of a capacitor C14 is grounded, a VCC pin of the amplifier U4 is connected with one end of a resistor R19, an OUT pin of the amplifier U4 is connected with the other end of a resistor R19, one end of a resistor R20 and an IN + pin of a comparator U5 respectively, the other end of a resistor R20 is grounded, a Q pin of a comparator U5 is connected with a P2.3 pin of a singlechip, and a VCC pin of a comparator U5 is connected with; the VIN pin and the EN pin of the voltage stabilization chip U6, one end of the capacitor C16 is connected with the P2.1 pin of the singlechip, the voltage VIN is connected into a secondary circuit, the other end of the capacitor C16 is grounded, the VOUT pin of the voltage stabilization chip U6 is connected with one end of the capacitor C17 and one end of the resistor R21 respectively, the other end of the capacitor C17 is grounded, the other end of the resistor R21 is connected with one end of the resistor R22 and the IN pin of the comparator U5 respectively, and the other end of the resistor R22 is grounded.
When the current value or the voltage value is not in a normal range (but is not zero), the central processing module inputs the collected current Iin of the secondary loop into a current-limiting switch chip U3, the current-limiting switch chip U3 compares whether the current Iin exceeds a limited short-circuit current value Io, if Iin < Io, the short circuit is judged not to occur, and if Iin > Io, the short circuit is judged to occur, and a low level is sent to the central processing module. Under the condition that a secondary loop is not short-circuited, the current value Iin output by the current-limiting switch chip U3 is changed into a voltage Vin through a resistor R18 and enters an amplifier U4, the Vin is amplified by the amplifier U4 and then is divided by a resistor R19 and a resistor R20 and enters a comparator U5 to serve as a reference voltage Vin, the input reference voltage Vf is amplified by the amplifier U4 and then is sent to the comparator U5, the reference voltage Vin and the reference voltage Vf are differentiated by the comparator U5, if the voltage difference exceeds a range value Vo, disconnection is judged, low level is sent to the central processing module, and if the voltage interpolation does not exceed the range value Vo, disconnection is judged. Under the condition of short circuit of a secondary loop, an amplifier U4 only amplifies an input reference voltage Vf and sends the amplified voltage to a comparator U5, a voltage stabilizing chip U6 receives an acquired secondary loop voltage Vin sent by a central processing module, a voltage stabilizing chip U6 stabilizes the voltage Vin and sends the stabilized voltage to the comparator U5, the comparator U5 makes a difference between the reference voltage Vin and the reference voltage Vf, if the voltage difference exceeds a range value Vo, disconnection is judged, low level is sent to the central processing module, and if the voltage interpolation does not exceed the range value Vo, disconnection is judged. The utility model discloses when measuring secondary circuit's electric current or voltage are unusual, use return circuit diagnostic circuit to judge whether secondary circuit sends the short circuit or the open circuit condition to show the diagnosis result, be convenient for maintain.
Further, as shown in fig. 1, the utility model discloses still include audible-visual alarm unit and the display element of being connected with the central processing module electricity respectively, the display element is used for showing the electric current and the voltage of measuring secondary circuit in real time to and give the state and judge, when monitoring that secondary circuit takes place the short circuit or open circuit, audible-visual alarm unit reports to the police, and the time suggestion staff maintains.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. Transformer substation's secondary circuit state monitoring devices, its characterized in that: the device comprises a central processing module, a voltage measuring unit, a current measuring unit, a loop diagnosis unit and an admittance phase angle unit, wherein the voltage measuring unit, the current measuring unit, the loop diagnosis unit and the admittance phase angle unit are respectively and electrically connected with the central processing module.
2. The apparatus of claim 1, wherein: the voltage measuring unit comprises a voltage acquisition circuit and a voltage judging circuit, wherein the output end of the voltage acquisition circuit is electrically connected with the input end of the voltage judging circuit, and the output end of the voltage judging circuit is electrically connected with the central processing module.
3. The apparatus of claim 2, wherein: the voltage acquisition circuit comprises an isolation amplifier U1, the voltage discrimination circuit comprises an operational amplifier U1A and an operational amplifier U1B, the model of the isolation amplifier U1 is HCPL7800, the model of the operational amplifier U1A is LM358, and the model of the operational amplifier U1B is LM 358; the output end of the isolation amplifier U1 is electrically connected with the input end of the operational amplifier U1A, the output end of the operational amplifier U1A is electrically connected with the input end of the operational amplifier U1B, and the output end of the operational amplifier U1B is electrically connected with the central processing module.
4. The apparatus of claim 1, wherein: the current measurement unit comprises a current acquisition circuit and a current amplification circuit, wherein the output end of the current acquisition circuit is electrically connected with the input end of the current amplification circuit, and the output end of the current amplification circuit is electrically connected with the central processing module.
5. The apparatus of claim 4, wherein: the current acquisition circuit comprises a current transformer CT, the current amplification circuit comprises an operational amplifier U2A, the model of the current transformer CT is TR3-01, and the model of the operational amplifier U2A is TL 072; the output end of the current transformer CT is electrically connected with the input end of the operational amplifier U2A, and the output end of the operational amplifier U2A is electrically connected with the central processing module.
6. The apparatus of claim 1, wherein: the admittance phase angle module comprises a logarithmic detector U2, and the logarithmic detector U2 is AD 8302; the input end of the logarithmic detector U2 is electrically connected with the central processing module, and the output end of the logarithmic detector U2 outputs admittance amplitude and phase amplitude.
7. The apparatus of claim 1, wherein: the loop diagnosis unit comprises a current-limiting switch circuit, a loop amplification circuit, a comparison circuit and a voltage stabilizing circuit, wherein the output end of the current-limiting switch circuit is electrically connected with the input end of the loop amplification circuit and the central processing module respectively, the output end of the loop amplification circuit and the output end of the voltage stabilizing circuit are electrically connected with the comparison circuit respectively, and the output end of the comparison circuit is electrically connected with the central processing unit.
8. The apparatus of claim 7, wherein: the current-limiting switch circuit comprises a current-limiting switch chip U3, the loop amplifying circuit comprises an amplifier U4, the comparison circuit comprises a comparator U5, the voltage stabilizing circuit comprises a voltage stabilizing chip U6, the model of the current-limiting switch chip U3 is MAX4917AEUK + T, the model of the amplifier U4 is MAX407LAUA, the model of the comparator U5 is MAX999EUK-T, and the model of the voltage stabilizing chip U6 is ADP1150 AUZ-33-R7; the output end of the current-limiting switch chip U3 is electrically connected with the input end of an amplifier U4, the output end of an amplifier U4 and the output end of a voltage-stabilizing chip U6 are respectively and electrically connected with the input end of a comparator U5, and the output end of a comparator U5 is electrically connected with the central processing module.
9. The apparatus of claim 1, wherein: the device also comprises an audible and visual alarm unit and a display unit which are respectively electrically connected with the central processing module.
10. The apparatus according to any one of claims 1-9, wherein: the central processing module adopts a single chip microcomputer with the model STM 32.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020180335.7U CN211785761U (en) | 2020-02-18 | 2020-02-18 | Transformer substation secondary circuit state monitoring device |
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| CN202020180335.7U CN211785761U (en) | 2020-02-18 | 2020-02-18 | Transformer substation secondary circuit state monitoring device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112330947A (en) * | 2020-11-20 | 2021-02-05 | 浙江大学 | Secondary water supply pump house data acquisition circuit based on STM32 singlechip |
| CN112710968A (en) * | 2020-11-19 | 2021-04-27 | 中广核核电运营有限公司 | Secondary circuit rapid detection on-off device |
| CN113030834A (en) * | 2021-04-19 | 2021-06-25 | 北京送变电有限公司 | Transformer secondary circuit line calibration device and method |
-
2020
- 2020-02-18 CN CN202020180335.7U patent/CN211785761U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112710968A (en) * | 2020-11-19 | 2021-04-27 | 中广核核电运营有限公司 | Secondary circuit rapid detection on-off device |
| CN112330947A (en) * | 2020-11-20 | 2021-02-05 | 浙江大学 | Secondary water supply pump house data acquisition circuit based on STM32 singlechip |
| CN113030834A (en) * | 2021-04-19 | 2021-06-25 | 北京送变电有限公司 | Transformer secondary circuit line calibration device and method |
| CN113030834B (en) * | 2021-04-19 | 2023-01-10 | 北京送变电有限公司 | Transformer secondary circuit line calibration device and method |
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