Power taking and sensor integrated device for power distribution network

Abstract

The invention discloses a power distribution network power taking and sensor integrated device, and relates to the field of electric signals, and the power distribution network power taking and sensor integrated device comprises a power taking and measuring integrated module which is used for completing the power taking while achieving the voltage measurement of a power distribution network, and providing a working power supply for electronic components in power distribution equipment; compared with the prior art, the device has the advantages that the measuring function and the power taking function are integrated, the situation that two devices are independently installed is avoided, the product size is greatly reduced, the requirement of the state grid for primary and secondary deep fusion is met, and the device is ideal power distribution network equipment; primary and secondary isolation is realized by adopting the principle of the capacitor voltage transformer, so that the sensor has relatively high loading capacity and anti-interference capacity; the traditional capacitance type voltage transformer has the risk of ferromagnetic resonance, while an intermediate compensation reactor is omitted by utilizing the characteristics of the amorphous alloy transformer, so that the hidden danger of ferromagnetic resonance is avoided from the technical principle, and the reliability of equipment operation is improved.

Description

Technical Field

[0001] The present invention relates to the field of electrical signals, and in particular to an integrated device for power supply and sensor in a distribution network. Background Art

[0002] In the distribution network sector, voltage sensors measure voltage in circuits, providing critical data for monitoring and protecting power systems. Power takeoff devices provide power to electronic components in distribution equipment. With the development of intelligent distribution networks, the demand for higher levels of integration and miniaturization of these devices is increasing.

[0003] In actual applications, if the measurement and power-drawing functions are to be realized simultaneously, the measuring device (voltage sensor) and the power-drawing device need to be installed separately. This not only increases the equipment cost and volume, but also reduces the equipment integration and reliability. It cannot meet the State Grid's requirements for the deep integration of primary and secondary distribution network equipment. There is an urgent need for a device that can deeply integrate the measurement and power-drawing functions. Summary of the Invention

[0004] The object of the present invention is to provide an integrated device for power distribution network power supply and sensor to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A power distribution network power supply and sensor integrated device, comprising:

[0007] The integrated power supply and measurement module is used to measure the voltage of the distribution network and simultaneously supply power to the electronic components in the distribution equipment.

[0008] The integrated power acquisition and measurement module includes a first capacitor, a second capacitor, a third capacitor, a first resistor, and a transformer. One end of the first capacitor acquires the distribution network voltage. The other end of the first capacitor is connected to one end of the second capacitor and one end of the first winding of the transformer. The other end of the first winding of the transformer is connected to one end of the third winding of the transformer and one end of the first resistor. The other end of the first resistor is connected to one end of the third capacitor. The other end of the third capacitor is grounded, and the other end of the second capacitor is grounded. The other end of the third winding of the transformer provides operating power for the electronic components in the power distribution equipment. The second winding of the transformer outputs the sampled voltage of the distribution network.

[0009] As a further solution of the present invention: the transformer is made of amorphous alloy.

[0010] As a further solution of the present invention: the distribution network power supply and sensor integrated device further includes a fluctuation limit measurement module, which includes:

[0011] The load current detection unit of the power distribution equipment is used to detect the magnitude of the load current flowing through the power distribution equipment, convert it into a voltage signal, and output it as a first signal to the signal amplification output unit.

[0012] The signal amplification and output unit is used to amplify the input first signal to obtain a second signal and output it to the dual signal output unit.

[0013] The dual-signal output unit is used to divide the second signal and output it to the dual-signal comparison unit immediately and with a delay, respectively. The two signals output to the dual-signal comparison unit are the third signal and the fourth signal respectively.

[0014] The dual-signal comparison unit is used to compare the voltage difference between the third signal and the fourth signal, and when the voltage difference is greater than a threshold, the sampling unit is driven to stop working; when the voltage difference is lower than the threshold, the sampling unit is not driven to stop working.

[0015] The stop sampling unit is used to disconnect the circuit between the second winding of the transformer and the voltage indicating device (specifically, a voltmeter) when working.

[0016] The input end of the load current detection unit of the distribution equipment is connected to the output end of the power collection and measurement integrated module, the output end of the load current detection unit of the distribution equipment is connected to the input end of the signal amplification output unit, the output end of the signal amplification output unit is connected to the input end of the dual signal output unit, the output end of the dual signal output unit is connected to the input end of the dual signal comparison unit, and the output end of the dual signal comparison unit is connected to the input end of the stop sampling unit.

[0017] As a further solution of the present invention: the load current detection unit of the distribution equipment includes a load and a Hall sensor, one end of the load is connected to the common point C (the output end of the power acquisition and measurement integrated module), the other end of the load is grounded through the Hall sensor, and the output end of the Hall sensor is connected to the input end of the signal amplification output unit.

[0018] As a further solution of the present invention: the signal amplification output unit includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a first amplifier. The in-phase end of the first amplifier is connected to one end of the third resistor and one end of the fifth resistor. The other end of the third resistor is connected to the output end of the load current detection unit of the distribution equipment. The other end of the fifth resistor is connected to the output end of the first amplifier and the input end of the dual-signal output unit. The inverting end of the first amplifier is connected to one end of the second resistor and one end of the fourth resistor. The other end of the fourth resistor is grounded. The other end of the second resistor is connected to the output end of the load current detection unit of the distribution equipment.

[0019] As a further solution of the present invention: the dual-signal output unit includes a first diode, a second diode, a first potentiometer, a second potentiometer, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, and a sixth capacitor. The positive electrode of the first diode is connected to the positive electrode of the second diode and the output end of the signal amplification output unit, the negative electrode of the first diode is connected to one end of the first potentiometer, the other end of the first potentiometer is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to one end of the eighth resistor and a common point D (the input end of the dual-signal comparison unit), and the other end of the eighth resistor is grounded. The negative electrode of the second diode is connected to one end of the second potentiometer, the other end of the second potentiometer is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to one end of the sixth capacitor, one end of the ninth resistor, and a common point E (the input end of the dual-signal comparison unit), the other end of the sixth capacitor is grounded, and the other end of the ninth resistor is grounded.

[0020] As a further solution of the present invention: the dual-signal comparison unit includes a second amplifier, a third amplifier, a tenth resistor, a third diode, a fourth diode, a sixth diode, and a seventh diode. The non-inverting end of the second amplifier is connected to the cathode of the sixth diode, the anode of the sixth diode is connected to the common point E, the non-inverting end of the third amplifier is connected to the cathode of the seventh diode, the anode of the seventh diode is connected to the common point D, the inverting end of the second amplifier is connected to the output end of the second amplifier and one end of the tenth resistor, the inverting end of the third amplifier is connected to the output end of the third amplifier, the cathode of the third diode, and the anode of the fourth diode, and the anode of the third diode is connected to the cathode of the fourth diode and the other end of the tenth resistor.

[0021] As a further solution of the present invention: the stop sampling unit includes an eleventh resistor, a first transistor, a first relay, a fifth diode, a first switch, a second switch, and a voltmeter. The first transistor is a photosensitive transistor, the third diode and the fourth diode are light-emitting diodes, the base of the first transistor receives light emitted by the third diode or the fourth diode, the collector of the first transistor is connected to the power supply voltage through the eleventh resistor, the emitter of the first transistor is connected to one end of the first relay and the cathode of the fifth diode, the other end of the first relay is grounded, and the anode of the fifth diode is grounded. When the first relay is in operation, it controls the first switch and the second switch to be disconnected, one end of the first switch is connected to the common point A, the other end of the first switch is connected to one end of the voltmeter, one end of the second switch is connected to the common point B, and the other end of the second switch is connected to the other end of the voltmeter.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention integrates the measurement and power-drawing functions into one. Compared with the existing solution of separately setting up the measurement and power-drawing devices, it avoids the need to install two sets of devices separately, greatly reduces the product volume, improves the degree of integration, meets the State Grid's requirements for deep integration of primary and secondary, and is an ideal distribution network equipment. The principle of the capacitive voltage transformer is adopted to achieve primary and secondary isolation, so that the sensor (here the tertiary winding of the transformer is used as a measuring device) has a strong load capacity and anti-interference ability, and can work stably in a complex power environment. Traditional capacitive voltage transformers have the risk of ferromagnetic resonance, and the present invention uses the characteristics of amorphous alloy (specifically Permalloy) transformers to omit the intermediate compensating reactance, avoiding the hidden dangers of ferromagnetic resonance from a technical principle, improving the reliability of equipment operation, and reducing maintenance costs and the probability of failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of a power distribution network and sensor integrated device.

[0024] Figure 2 This is the circuit diagram of the integrated power supply and measurement module.

[0025] Figure 3 This is the equivalent circuit diagram of the integrated power supply and measurement module.

[0026] Figure 4 This is the circuit diagram of the fluctuation limit measurement module. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] See also Figure 1 and Figure 2 , a power distribution network and sensor integrated device, comprising:

[0029] The integrated power supply and measurement module 1 is used to simultaneously measure the voltage of the distribution network and supply power to the electronic components in the distribution equipment.

[0030] The power-taking and measuring integrated module 1 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, and a transformer T1. One end of the first capacitor C1 obtains the distribution network voltage, and the other end of the first capacitor C1 is connected to one end of the second capacitor C2 and one end of the first winding T1 of the transformer T1. The other end of the first winding T1 of the transformer T1 is connected to one end of the third winding T3 of the transformer T1 and one end of the first resistor R1. The other end of the first resistor R1 is connected to one end of the third capacitor C3, and the other end of the third capacitor C3 is grounded. The other end of the second capacitor C2 is grounded, and the other end of the third winding T3 of the transformer T1 provides a working power supply for the electronic components in the power distribution equipment. The second winding T2 of the transformer T1 outputs the sampled voltage of the distribution network.

[0031] In this embodiment: Please refer to Figure 2 , the transformer T1 is made of amorphous alloy material.

[0032] The voltage of the distribution network is divided by the first capacitor C1 (high-voltage capacitor) and the second capacitor C2. The transformer T1 is made of amorphous alloy material. The primary side winding is the first winding T1, and the second winding T2 in the secondary side winding is the measuring winding (for voltage signal sampling), and the third winding T3 is the power-taking winding (for supplying power to the load X). The voltage compensation circuit is composed of the first resistor R1 and the third capacitor C3 connected in series, and is used to offset the voltage drop of the measuring winding. After the voltage of the distribution network is divided by the first capacitor C1 and the second capacitor C2, the voltage signal is mutually inducted to the second winding T2 and the third winding T3 through the first winding T1 of the transformer T1. The voltage signal output by the second winding T2 is used for measurement, and the third winding T3 converts electromagnetic energy into electrical energy to achieve the power-taking function.

[0033] Please refer to Figure 3 , for the convenience of analysis and understanding, all the leakage inductances and leakage resistances of the first winding T1, the second winding T2, and the third winding T3 of the transformer T1 are converted to the primary side, and the equivalent circuit of the capacitive voltage sensor is obtained. The equivalent circuit includes a voltage source Us, a high-voltage equivalent capacitor C4 (corresponding to the first capacitor C1), a low-voltage equivalent capacitor C5 (corresponding to the second capacitor C2), a compensation inductor L, a resistor R, and a load resistor R'. L is the value of the compensation inductor plus the leakage inductance of the primary and secondary side windings of the transformer T1 converted to the primary side, and R is the value of the leakage resistance of the primary and secondary side windings of the transformer T1 converted to the primary side. The impedance of the rated load resistor R' is set to 1 MΩ, and R << R', so R is ignored in the calculation.

[0034] Then, from the circuit schematic diagram, it can be obtained that:

[0035] (1).

[0036] (2).

[0037] (3).

[0038] In the formula is the current flowing through the high-voltage equivalent capacitor C4. To compensate for the current flowing through the inductor L loop. is the current flowing through the low-voltage equivalent capacitor C5. Us is the voltage obtained from the distribution network. is the capacitive reactance of the high voltage equivalent capacitor C4. is the capacitive reactance of the low-voltage equivalent capacitor C5. To compensate for the inductive reactance of inductor L. is the load terminal voltage. In the phasor method of circuit analysis, J is the imaginary unit.

[0039] Substituting formula (1) into formula (2) yields:

[0040] (4).

[0041] Substituting formula (3) into formula (4) yields

[0042] (5).

[0043] During the design process, the high and low voltage capacitors are connected in parallel at a power frequency of 50HZ, and the equivalent impedance of the leakage inductance of the transformer T1 is equal, that is:

[0044] (6).

[0045] Substituting formula (6) into formula (5) yields:

[0046] (7).

[0047] Adjusting formula (7) yields:

[0048] (8).

[0049] It can be seen that at the power frequency of 50HZ, the load terminal voltage It is determined by the voltage divider ratio of the high voltage equivalent capacitor C4 and the low voltage equivalent capacitor C5. Figure 2 In the embodiment, the output voltage of the third winding T3 of the transformer T1 is determined by the first capacitor C1 and the second capacitor C2 to ensure that the output voltage meets the power demand of the load X.

[0050] In another embodiment: For the material of transformer T1, in addition to amorphous alloys, other high permeability, low loss magnetic materials can also be explored, and the intermediate compensating reactance can be omitted to achieve the integrated measurement and power supply functions, which may have advantages in certain aspects of cost or performance.

[0051] In this example: See Figure 1 and Figure 4 The distribution network power supply and sensor integrated device further includes a fluctuation limit measurement module 2, which includes:

[0052] The load current detection unit of the power distribution equipment is used to detect the magnitude of the current flowing through the load X of the power distribution equipment, convert it into a voltage signal, and output it as the first signal to the signal amplification output unit.

[0053] The signal amplification and output unit is used to amplify the input first signal to obtain a second signal and output it to the dual signal output unit.

[0054] The dual-signal output unit is used to divide the second signal and output it to the dual-signal comparison unit immediately and with a delay, respectively. The two signals output to the dual-signal comparison unit are the third signal and the fourth signal respectively.

[0055] The dual-signal comparison unit is used to compare the voltage difference between the third signal and the fourth signal, and when the voltage difference is greater than a threshold, the sampling unit is driven to stop working; when the voltage difference is lower than the threshold, the sampling unit is not driven to stop working.

[0056] The stop sampling unit is used to disconnect the circuit between the second winding T2 of the transformer T1 and the voltage indicator device (specifically, a voltmeter V) when working.

[0057] The input end of the load current detection unit of the distribution equipment is connected to the output end of the power collection and measurement integrated module 1, the output end of the load current detection unit of the distribution equipment is connected to the input end of the signal amplification output unit, the output end of the signal amplification output unit is connected to the input end of the dual signal output unit, the output end of the dual signal output unit is connected to the input end of the dual signal comparison unit, and the output end of the dual signal comparison unit is connected to the input end of the stop sampling unit.

[0058] In this example: See Figure 4 The load current detection unit of the power distribution equipment includes a load X and a Hall sensor H1. One end of the load X is connected to the common point C (the output end of the power acquisition and measurement integrated module 1), and the other end of the load X is grounded through the Hall sensor H1. The output end of the Hall sensor H1 is connected to the input end of the signal amplification output unit.

[0059] Measuring distribution network voltage requires high precision, but fluctuations in the power-drawing load X can affect voltage stability. For example, if the power-drawing load X suddenly changes, the current change may be coupled to the first winding T1 through transformer T1, causing voltage fluctuations at the divider point, which in turn affects measurement accuracy. Because transformer T1 is based on the principle of a capacitive voltage transformer, achieving primary and secondary isolation and strong load capacity and anti-interference capabilities, the fluctuation-limiting measurement module 2 is designed to stop measuring the distribution network voltage if it detects significant fluctuations in the load X.

[0060] When the load X fluctuates, the total current flowing through the load X changes. The total current is detected by the Hall sensor H1 and converted into a voltage signal, which is output as the first signal. When the load X fluctuates, the first signal changes in size.

[0061] In this example: See Figure 4 The signal amplification and output unit includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a first amplifier U1. The non-inverting end of the first amplifier U1 is connected to one end of the third resistor R3 and one end of the fifth resistor R5. The other end of the third resistor R3 is connected to the output end of the load current detection unit of the distribution equipment. The other end of the fifth resistor R5 is connected to the output end of the first amplifier U1 and the input end of the dual-signal output unit. The inverting end of the first amplifier U1 is connected to one end of the second resistor R2 and one end of the fourth resistor R4. The other end of the fourth resistor R4 is grounded. The other end of the second resistor R2 is connected to the output end of the load current detection unit of the distribution equipment.

[0062] The first signal is amplified by the first amplifier U1 to obtain a second signal, which is then output to the bidirectional output unit.

[0063] In this example: See Figure 4 The dual-signal output unit includes a first diode D1, a second diode D2, a first potentiometer RP1, a second potentiometer RP2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a sixth capacitor C6. The anode of the first diode D1 is connected to the anode of the second diode D2 and the output end of the signal amplification output unit. The cathode of the first diode D1 is connected to one end of the first potentiometer RP1. The other end of the first potentiometer RP1 is connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 is connected to one end of the eighth resistor R8 and a common point D (the input end of the dual-signal comparison unit). The other end of the eighth resistor R8 is grounded. The cathode of the second diode D2 is connected to one end of the second potentiometer RP2. The other end of the second potentiometer RP2 is connected to one end of the seventh resistor R7. The other end of the seventh resistor R7 is connected to one end of the sixth capacitor C6, one end of the ninth resistor R9, and a common point E (the input end of the dual-signal comparison unit). The other end of the sixth capacitor C6 is grounded, and the other end of the ninth resistor R9 is grounded.

[0064] The second signal passes through the first diode D1, the first potentiometer RP1, the sixth resistor R6 to the eighth resistor R8, and the voltage on the eighth resistor R8 is used as the third signal and is immediately output to the dual-signal comparison unit. The second signal passes through the second diode D2, the second potentiometer RP2, the seventh resistor R7, the sixth capacitor C6 to the ninth resistor R9, and the voltage on the ninth resistor R9 is used as the fourth signal and is output to the dual-signal comparison unit. When the first diode D1, the first potentiometer RP1, the sixth resistor R6, and the eighth resistor R8 are all the same as the second diode D2, the second potentiometer RP2, the seventh resistor R7, and the ninth resistor R9 respectively, due to the charging and discharging function of the sixth capacitor C6, the fourth signal is the third signal before the delay. For example, the fourth signal currently output is the third signal 5S ago. The specific delay time depends on the resistance values ​​of the second potentiometer RP2 and the seventh resistor R7.

[0065] In this example: See Figure 4 The dual-signal comparison unit includes a second amplifier U2, a third amplifier U3, a tenth resistor R10, a third diode D3, a fourth diode D4, a sixth diode D6, and a seventh diode D7. The non-inverting end of the second amplifier U2 is connected to the cathode of the sixth diode D6, the anode of the sixth diode D6 is connected to the common point E, the non-inverting end of the third amplifier U3 is connected to the cathode of the seventh diode D7, the anode of the seventh diode D7 is connected to the common point D, the inverting end of the second amplifier U2 is connected to the output end of the second amplifier U2 and one end of the tenth resistor R10, the inverting end of the third amplifier U3 is connected to the output end of the third amplifier U3, the cathode of the third diode D3, and the anode of the fourth diode D4, and the anode of the third diode D3 is connected to the cathode of the fourth diode D4 and the other end of the tenth resistor R10.

[0066] When the load X fluctuates, the current fluctuates, causing a difference between the third and fourth signals. When the load X fluctuates significantly, the difference is even greater, resulting in a voltage difference sufficient to turn on the third diode D3 or the fourth diode D4 (i.e., the corresponding voltage difference is greater than the threshold). The second and third amplifiers U2 and U3 act as followers, while the sixth and seventh diodes D6 and D7 provide isolation, preventing the common points D and E from forming a loop.

[0067] In this example: See Figure 4The stop sampling unit includes an eleventh resistor R11, a first transistor V1, a first relay J1, a fifth diode D5, a first switch S1, a second switch S2, and a voltmeter V. The first transistor V1 is a photosensitive transistor, the third diode D3 and the fourth diode D4 are light-emitting diodes, the base of the first transistor V1 receives light emitted by the third diode D3 or the fourth diode D4, the collector of the first transistor V1 is connected to the power supply voltage through the eleventh resistor R11, the emitter of the first transistor V1 is connected to one end of the first relay J1 and the cathode of the fifth diode D5, the other end of the first relay J1 is grounded, and the anode of the fifth diode D5 is grounded. When the first relay J1 is in operation, it controls the first switch S1 and the second switch S2 to be disconnected, one end of the first switch S1 is connected to the common point A, the other end of the first switch S1 is connected to one end of the voltmeter V, one end of the second switch S2 is connected to the common point B, and the other end of the second switch S2 is connected to the other end of the voltmeter V.

[0068] When the third diode D3 or the fourth diode D4 is turned on and emits light, the first transistor V1 is turned on, so that the first relay J1 is energized and operates, and controls the first switch S1 and the second switch S2 to be disconnected, thereby preventing the voltmeter V from reading an erroneous reading at this time and causing misleading.

[0069] In another embodiment, the voltmeter may be other voltage indicating devices, such as an AC millivoltmeter, a digital multimeter, etc.

[0070] The working principle of the present invention is as follows: the integrated power supply and measurement module 1 is used to complete power supply while realizing the distribution network voltage measurement, and provide working power for the electronic components in the distribution equipment. The distribution equipment load current detection unit is used to detect the magnitude of the current flowing through the distribution equipment load X, convert it into a voltage signal, and output it as the first signal to the signal amplification and output unit. The signal amplification and output unit is used to amplify the input first signal, obtain the second signal, and output it to the dual-signal output unit. The dual-signal output unit is used to divide the second signal and output it to the dual-signal comparison unit immediately and with a delay, respectively. The two signals output to the dual-signal comparison unit are the third signal and the fourth signal respectively. The dual-signal comparison unit is used to compare the voltage difference between the third signal and the fourth signal. When the voltage difference is greater than the threshold, the stop sampling unit is driven to work. When the voltage difference is lower than the threshold, the stop sampling unit is not driven to work. The stop sampling unit is used to disconnect the second winding T2 of the transformer T1 and the circuit of the voltage magnitude indication device when working.

[0071] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive.

[0072] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A power distribution network and sensor integrated device, characterized in that: The distribution network power supply and sensor integrated device includes: The integrated power supply and measurement module is used to measure the voltage of the distribution network and simultaneously supply power to the electronic components in the distribution equipment. The integrated power acquisition and measurement module includes a first capacitor, a second capacitor, a third capacitor, a first resistor, and a transformer. One end of the first capacitor obtains the distribution network voltage, the other end of the first capacitor is connected to one end of the second capacitor and one end of the first winding of the transformer, the other end of the first winding of the transformer is connected to one end of the third winding of the transformer and one end of the first resistor, the other end of the first resistor is connected to one end of the third capacitor, the other end of the third capacitor is grounded, the other end of the second capacitor is grounded, and the other end of the third winding of the transformer provides working power for the electronic components in the distribution equipment; the second winding of the transformer outputs the sampled voltage of the distribution network.

2. The integrated device for power distribution network and sensor according to claim 1, characterized in that: The transformer is made of amorphous alloy.

3. The integrated device for power distribution network power supply and sensor according to claim 1 or 2, characterized in that: The distribution network power supply and sensor integrated device further includes a fluctuation limit measurement module, which includes: The load current detection unit of the power distribution equipment is used to detect the magnitude of the load current flowing through the power distribution equipment, convert it into a voltage signal, and output it as a first signal to the signal amplification and output unit; The signal amplification and output unit is used to amplify the input first signal to obtain a second signal and output it to the dual signal output unit. a dual-signal output unit, configured to divide the second signal and output the divided signal to the dual-signal comparison unit immediately and with a delay, the two signals output to the dual-signal comparison unit being the third signal and the fourth signal respectively; a dual-signal comparison unit, configured to compare a voltage difference between the third signal and the fourth signal, and to drive the sampling unit to stop working when the voltage difference is greater than a threshold value, and not drive the sampling unit to stop working when the voltage difference is lower than the threshold value; A stop sampling unit is used to disconnect the secondary winding of the transformer and the circuit of the voltage indicating device during operation; The input end of the load current detection unit of the distribution equipment is connected to the output end of the power collection and measurement integrated module, the output end of the load current detection unit of the distribution equipment is connected to the input end of the signal amplification output unit, the output end of the signal amplification output unit is connected to the input end of the dual signal output unit, the output end of the dual signal output unit is connected to the input end of the dual signal comparison unit, and the output end of the dual signal comparison unit is connected to the input end of the stop sampling unit.

4. The integrated device for power distribution network and sensor according to claim 3, characterized in that: The load current detection unit of the power distribution equipment includes a load and a Hall sensor. One end of the load is connected to the common point C, the other end of the load is grounded through the Hall sensor, and the output end of the Hall sensor is connected to the input end of the signal amplification output unit.

5. The integrated device for power distribution network and sensor according to claim 3, characterized in that: The signal amplification output unit includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a first amplifier. The in-phase end of the first amplifier is connected to one end of the third resistor and one end of the fifth resistor. The other end of the third resistor is connected to the output end of the load current detection unit of the distribution equipment. The other end of the fifth resistor is connected to the output end of the first amplifier and the input end of the dual-signal output unit. The inverting end of the first amplifier is connected to one end of the second resistor and one end of the fourth resistor. The other end of the fourth resistor is grounded. The other end of the second resistor is connected to the output end of the load current detection unit of the distribution equipment.

6. The integrated device for power distribution network and sensor according to claim 3, characterized in that: The dual-signal output unit includes a first diode, a second diode, a first potentiometer, a second potentiometer, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, and a sixth capacitor. The anode of the first diode is connected to the anode of the second diode and the output end of the signal amplification output unit, the cathode of the first diode is connected to one end of the first potentiometer, the other end of the first potentiometer is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to one end of the eighth resistor and a common point D, and the other end of the eighth resistor is grounded. The cathode of the second diode is connected to one end of the second potentiometer, the other end of the second potentiometer is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to one end of the sixth capacitor, one end of the ninth resistor, and a common point E. The other end of the sixth capacitor is grounded, and the other end of the ninth resistor is grounded.

7. The integrated device for power distribution network and sensor according to claim 3, characterized in that: The dual-signal comparison unit includes a second amplifier, a third amplifier, a tenth resistor, a third diode, a fourth diode, a sixth diode, and a seventh diode. The in-phase end of the second amplifier is connected to the cathode of the sixth diode, the anode of the sixth diode is connected to the common point E, the in-phase end of the third amplifier is connected to the cathode of the seventh diode, the anode of the seventh diode is connected to the common point D, the inverting end of the second amplifier is connected to the output end of the second amplifier and one end of the tenth resistor, the inverting end of the third amplifier is connected to the output end of the third amplifier, the cathode of the third diode, and the anode of the fourth diode, and the anode of the third diode is connected to the cathode of the fourth diode and the other end of the tenth resistor.

8. The integrated device for power distribution network and sensor according to claim 7, characterized in that: The stop sampling unit includes an eleventh resistor, a first transistor, a first relay, a fifth diode, a first switch, a second switch, and a voltmeter. The first transistor is a photosensitive transistor, the third diode and the fourth diode are light-emitting diodes, the base of the first transistor receives light emitted by the third diode or the fourth diode, the collector of the first transistor is connected to the power supply voltage through the eleventh resistor, the emitter of the first transistor is connected to one end of the first relay and the negative electrode of the fifth diode, the other end of the first relay is grounded, and the positive electrode of the fifth diode is grounded. When the first relay is working, it controls the first switch and the second switch to be disconnected, one end of the first switch is connected to the common point A, the other end of the first switch is connected to one end of the voltmeter, one end of the second switch is connected to the common point B, and the other end of the second switch is connected to the other end of the voltmeter.

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