Single-phase earth fault early warning device for 10KV power distribution network
The 10KV distribution network single-phase grounding fault early warning device addresses the lack of self-test in existing equipment by incorporating a self-check module and power supply control to ensure accurate fault detection and remote monitoring, preventing escalation of faults.
Patent Information
- Application Number
- CN202411225204.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2024-12-13
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing single-phase grounding fault detection equipment in 10KV distribution networks lacks a self-test function, leading to potential misjudgment and failure to detect faults promptly, which can escalate into more severe issues like cable trench fires and wildfires.
A 10KV distribution network single-phase grounding fault early warning device with a voltage signal acquisition module, trigger alarm module, self-check module, power supply control module, signal transmitting module, signal receiving module, host computer, and cloud platform, which includes components like AND gates, field effect transistors, and thyristors to periodically check equipment integrity and prevent false alarms.
Ensures timely detection of single-phase grounding faults, avoids false alarms due to network interference, and enables remote monitoring of network information through real-time data recording and reporting.
Smart Images
Figure CN119125762A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of voltage detection, in particular to a 10KV distribution network single-phase grounding fault early warning device. Background Art
[0002] Single-phase grounding faults account for a high proportion of distribution system faults. If not handled in time, they may evolve into two-phase short circuit faults, and even cause cable trench fires and wildfires, expanding the scope of the accident. Single-phase grounding detection can detect and handle faults in time to prevent further expansion of the fault.
[0003] In the process of single-phase grounding detection of existing circuits, relevant equipment is often used for detection. However, whether the relevant equipment is intact needs to be judged by the user himself, and it lacks self-test function and needs to be improved. Summary of the invention
[0004] The object of the present invention is to provide a 10KV distribution network single-phase grounding fault early warning device 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 10KV distribution network single-phase grounding fault early warning device, comprising:
[0007] The voltage signal acquisition module is used to collect the three-phase voltage of the 10KV distribution network and obtain the three-phase sampling voltage. When the three-phase sampling voltage exists, the voltage signal is output to the trigger alarm module; when there is a phase loss in the three-phase sampling voltage, no voltage signal is output;
[0008] Trigger alarm module, used for alarm prompt when sampling voltage is not received;
[0009] A self-check module, which is used to charge the storage device when the voltage signal acquisition module outputs a voltage signal, and when the storage device is charged to a threshold value, drive the trigger alarm module to alarm and discharge the voltage of the energy storage device at the same time;
[0010] The first output end of the voltage signal acquisition module is connected to the first input end of the trigger alarm module, the second output end of the voltage signal acquisition module is connected to the input end of the self-test module, and the output end of the self-test module is connected to the second input end of the trigger alarm module.
[0011] As a further solution of the present invention: the voltage signal acquisition module includes an AND gate, a fourth resistor, and three signal acquisition units. The three signal acquisition units respectively collect the three-phase voltage of the 10KV distribution network, obtain the three-phase sampling voltage, and input them into the three input ends of the AND gate respectively. The output end of the AND gate is connected to one end of the fourth resistor and the input end of the self-test module (common point D), and the other end of the fourth resistor is connected to the first input end of the trigger alarm module.
[0012] As a further solution of the present invention: the three signal acquisition units have the same structure, and the difference is that the voltages of the 10KV distribution network are different. The signal acquisition unit includes a first voltage transformer, a first diode, a first capacitor, a first resistor, and a second diode. The first voltage transformer collects any phase voltage of the 10KV distribution network. One end of the first voltage transformer is grounded, and the other end of the first voltage transformer is connected to the positive electrode of the first diode. The negative electrode of the first diode is connected to one end of the first capacitor and one end of the first resistor. The other end of the first capacitor is grounded, and the other end of the first resistor is connected to the positive electrode of the second diode. The negative electrode of the second diode is connected to one of the three input ends of the AND gate.
[0013] As a further solution of the present invention: the trigger alarm module includes a first field effect transistor, a second triode, a fifth resistor, a sixth resistor, a third field effect transistor, a speaker, and an eleventh diode. The drain of the first field effect transistor is connected to the base of the second triode and the first output end of the voltage signal acquisition module, the source of the first field effect transistor is grounded, the gate of the first field effect transistor is connected to the output end of the self-test module, the emitter of the second triode is grounded, the collector of the second triode is connected to one end of the fifth resistor and the gate of the third field effect transistor, the other end of the fifth resistor is connected to one end of the speaker, the working power supply, and the negative electrode of the eleventh diode, the positive electrode of the eleventh diode is connected to the output end of the self-test module, the other end of the speaker is connected to the drain of the third field effect transistor, the source of the third field effect transistor is connected to one end of the sixth resistor, and the other end of the sixth resistor is grounded.
[0014] As a further solution of the present invention: the self-test module includes a seventh resistor, a first potentiometer, a fourth capacitor, an eighth resistor, a seventh diode, and a first thyristor, one end of the seventh resistor is connected to the second output end of the voltage signal acquisition module, the other end of the seventh resistor is connected to one end of the first potentiometer, the other end of the first potentiometer is connected to one end of the eighth resistor, one end of the fourth capacitor, and the negative electrode of the seventh diode, the other end of the fourth capacitor is grounded, the other end of the eighth resistor is connected to the positive electrode of the first thyristor, the negative electrode of the first thyristor is grounded, and the control electrode of the first thyristor is connected to the positive electrode of the seventh diode and the second input end of the trigger alarm module.
[0015] As a further solution of the present invention: the 10KV distribution network single-phase grounding fault early warning device also includes:
[0016] The power supply control module is used to provide working power to the trigger alarm module when one or more phases of the three-phase sampling voltage are higher than the set voltage threshold; when the three-phase sampling voltage is lower than the set voltage threshold, no working power is provided to the trigger alarm module;
[0017] The third output terminal of the voltage signal acquisition module is connected to the input terminal of the power supply control module, and the output terminal of the power supply control module is connected to the third input terminal of the trigger alarm module.
[0018] As a further solution of the present invention: the power supply control module includes a fourth field effect transistor, a fifth field effect transistor, a sixth field effect transistor, a seventh field effect transistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, an eighth diode, a ninth diode, and a tenth diode. The source of the fourth field effect transistor is connected to the power supply, the drain of the fourth field effect transistor is connected to the source of the fifth field effect transistor, the drain of the fifth field effect transistor is connected to the source of the sixth field effect transistor, the drain of the sixth field effect transistor is connected to one end of the twelfth resistor, the other end of the twelfth resistor is connected to the gate of the seventh field effect transistor, the source of the seventh field effect transistor is connected to the power supply, and the seventh field effect transistor is connected to the gate of the seventh field effect transistor. The drain of the tube is connected to the third input terminal of the trigger alarm module, the gate of the fourth field effect tube is connected to one end of the ninth resistor, the other end of the ninth resistor is connected to the anode of the eighth diode, and the cathode of the eighth diode is connected to the third output terminal of the voltage signal acquisition module, the gate of the fifth field effect tube is connected to one end of the tenth resistor, the other end of the tenth resistor is connected to the anode of the ninth diode, and the cathode of the ninth diode is connected to the third output terminal of the voltage signal acquisition module, the gate of the sixth field effect tube is connected to one end of the eleventh resistor, the other end of the eleventh resistor is connected to the anode of the tenth diode, and the cathode of the tenth diode is connected to the third output terminal of the voltage signal acquisition module.
[0019] As a further solution of the present invention: the 10KV distribution network single-phase grounding fault early warning device also includes:
[0020] The signal transmitting module is used to transmit an alarm signal to the signal receiving module when the alarm module is triggered to work;
[0021] The signal receiving module is used to feed back the alarm signal to the host computer after receiving it;
[0022] The host computer is used to record the triggering alarm module number and alarm time after receiving the alarm signal, and upload the triggering alarm module number and alarm time to the cloud platform;
[0023] The cloud platform is used to display all the alarm triggering module numbers and the alarm time when the alarm triggering module numbers exist;
[0024] The input end of the signal transmitting module is connected to the output end of the trigger alarm module, the output end of the signal transmitting module is connected to the input end of the signal receiving module, the output end of the signal receiving module is connected to the input end of the host computer, and the output end of the host computer is connected to the cloud platform.
[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention sets a self-check module to periodically detect whether the equipment is faulty, and controls the triggering alarm module to work when it is normal, indicating that the equipment is in good condition; a power supply control module is set to avoid false triggering of the alarm module when there is interference, voltage fluctuation and other conditions in the distribution network; a signal transmission module, a signal receiving module, a host computer and a cloud platform are set to record the alarm information in real time, so that the staff can obtain the distribution network information remotely. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 The schematic diagram of a 10KV distribution network single-phase grounding fault early warning device.
[0027] Figure 2 This is the circuit diagram of the voltage signal acquisition module and the trigger alarm module.
[0028] Figure 3 This is the circuit diagram of the self-test module.
[0029] Figure 4 This is the circuit diagram of the power supply control module. DETAILED DESCRIPTION
[0030] 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.
[0031] See also Figure 1 , a 10KV distribution network single-phase grounding fault early warning device, comprising:
[0032] The voltage signal acquisition module 1 is used to collect the three-phase voltage of the 10KV distribution network, obtain the three-phase sampling voltage, and output the voltage signal to the trigger alarm module 2 when the three-phase sampling voltage exists; when there is a phase loss in the three-phase sampling voltage, no voltage signal is output;
[0033] Triggering alarm module 2, for alarming when no sampling voltage is received;
[0034] The self-check module 3 is used to charge the storage device when the voltage signal acquisition module 1 outputs a voltage signal, and when the storage device is charged to a threshold value, drive the trigger alarm module 2 to alarm and discharge the voltage of the energy storage device at the same time;
[0035] The first output end of the voltage signal acquisition module 1 is connected to the first input end of the trigger alarm module 2 , the second output end of the voltage signal acquisition module 1 is connected to the input end of the self-test module 3 , and the output end of the self-test module 3 is connected to the second input end of the trigger alarm module 2 .
[0036] In this example: See Figure 2 The voltage signal acquisition module 1 includes an AND gate U1, a fourth resistor R4, and three signal acquisition units. The three signal acquisition units respectively collect the three-phase voltage of the 10KV distribution network, obtain the three-phase sampling voltage, and input it into the three input ends of the AND gate U1 respectively. The output end of the AND gate U1 is connected to one end of the fourth resistor R4 and the input end of the self-test module 3 (common point D), and the other end of the fourth resistor R4 is connected to the first input end of the trigger alarm module 2.
[0037] When the three-phase voltages U, V, and W of the 10KV distribution network are normally supplied and there is no phase grounding, the three input terminals of the AND gate U1 are all high level, and the AND gate U1 outputs a high level, and the output high level is supplied to the trigger alarm module 2 and the self-test module 3; on the contrary, when there is phase grounding, the input terminals of the AND gate U1 are not all high level, and the AND gate U1 outputs a low level, and no voltage is output to the subsequent circuit.
[0038] In another embodiment, a related light emitting diode may be added to indicate the output status of the AND gate U1. Since the signal acquisition unit is provided with a light emitting diode, a light emitting diode is no longer provided at the output end of the AND gate U1.
[0039] In this example: See Figure 2 The three signal acquisition units have the same structure, and the difference lies in that the voltage of the 10KV distribution network is different. The signal acquisition unit includes a first voltage transformer L1, a first diode D1, a first capacitor C1, a first resistor R1, and a second diode D2. The first voltage transformer L1 collects any phase voltage of the 10KV distribution network. One end of the first voltage transformer L1 is grounded, and the other end of the first voltage transformer L1 is connected to the positive electrode of the first diode D1. The negative electrode of the first diode D1 is connected to one end of the first capacitor C1 and one end of the first resistor R1. The other end of the first capacitor C1 is grounded, and the other end of the first resistor R1 is connected to the positive electrode of the second diode D2. The negative electrode of the second diode D2 is connected to one of the three input ends of the AND gate U1.
[0040] The first voltage transformer L1 collects any phase voltage of the 10KV power distribution network, obtains a stable voltage signal after rectification and filtering by the first diode D1 and the first capacitor C1, and outputs it to one of the three input terminals of the AND gate U1 through the second diode D2.
[0041] In another embodiment: the signal acquisition unit is specifically applied to a 10KV power distribution network, and may also be applied to a three-phase power distribution network of other values.
[0042] In this example: See Figure 2 The trigger alarm module 2 includes a first field effect transistor V1, a second triode V2, a fifth resistor R5, a sixth resistor R6, a third field effect transistor V3, a speaker SPEAKER, and an eleventh diode D11. The drain of the first field effect transistor V1 is connected to the base of the second triode V2 and the first output end of the voltage signal acquisition module 1, the source of the first field effect transistor V1 is grounded, the gate of the first field effect transistor V1 is connected to the output end of the self-test module 3, the emitter of the second triode V2 is grounded, the collector of the second triode V2 is connected to one end of the fifth resistor R5 and the gate of the third field effect transistor V3, the other end of the fifth resistor R5 is connected to one end of the speaker SPEAKER, the working power supply VDD, and the negative electrode of the eleventh diode D11, the positive electrode of the eleventh diode D11 is connected to the output end of the self-test module 3, the other end of the speaker SPEAKER is connected to the drain of the third field effect transistor V3, the source of the third field effect transistor V3 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is grounded.
[0043] When the voltage signal acquisition module 1 outputs a high level, the second transistor V2 is turned on, pulling down the gate voltage of the third field effect transistor V3, the third field effect transistor V3 is turned off, and the speaker SPEAKER does not work. When the voltage signal acquisition module 1 outputs a low level, the second transistor V2 is turned off, the third field effect transistor V3 is turned on, and the speaker SPEAKER works and beeps, reminding that there is single-phase grounding.
[0044] In another embodiment, the speaker SPEAKER can be replaced with a voice chip or other related prompting device.
[0045] In this example: See Figure 3 The self-test module 3 includes a seventh resistor R7, a first potentiometer RP1, a fourth capacitor C4, an eighth resistor R8, a seventh diode D7, and a first thyristor Z1. One end of the seventh resistor R7 is connected to the second output end of the voltage signal acquisition module 1, and the other end of the seventh resistor R7 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 eighth resistor R8, one end of the fourth capacitor C4, and the negative electrode of the seventh diode D7. The other end of the fourth capacitor C4 is grounded. The other end of the eighth resistor R8 is connected to the positive electrode of the first thyristor Z1, the negative electrode of the first thyristor Z1 is grounded, and the control electrode of the first thyristor Z1 is connected to the positive electrode of the seventh diode D7 and the second input end of the trigger alarm module 2.
[0046] In daily use, after the equipment fails, the user is often not clear, resulting in misjudgment of single-phase grounding. Therefore, a self-test module 3 is set. When the 10KV distribution network is powered normally, the common point D is at a high level, and the energy storage device fourth capacitor C4 is charged through the seventh resistor R7 and the first potentiometer RP1. When the fourth capacitor C4 is charged to be sufficient to turn on the seventh diode D7, a high level will be formed at the common point E, so that the first field effect tube V1 is grounded to discharge, the second triode V2 is cut off, the third field effect tube V3 is turned on, and the speaker SPEAKER sounds an alarm. At the same time, the first thyristor Z1 is turned on to quickly discharge the voltage on the fourth capacitor C4, so that the circuit returns to the initial state, and the common point E becomes a low level again, triggering the alarm module 2 without the input of the working voltage (common point E high level or working power supply VDD). The charging time of the fourth capacitor C4 is adjusted by the first potentiometer RP1, so that the detection of the trigger alarm module 2 is completed periodically. Since the voltage of the seventh diode D7 is determined by the fourth capacitor C4, and the discharge time of the fourth capacitor C4 is determined by the first thyristor Z1, after maintenance, when the alarm module 2 is triggered, the time of the speaker SPEAKER alarm remains the same, which is different from the alarm when the 10KV distribution network is single-phase grounded, avoiding wrong judgment.
[0047] In another embodiment: a detection circuit related to the voltage signal acquisition module 1 may also be set. The present application sets a high-level input (obtaining a three-phase sampling voltage as a high level) and a high-level output (the AND gate U1 outputs a high level when there is no single-phase grounding). When a fault occurs in the voltage signal acquisition module 1, it becomes a low level and directly triggers the speaker SPEAKER to work. Therefore, a detection circuit related to the voltage signal acquisition module 1 is no longer set.
[0048] In this example: See Figure 1 and Figure 4 , the 10KV distribution network single-phase grounding fault early warning device also includes:
[0049] The power supply control module 4 is used to provide the working power supply VDD for the triggering alarm module 2 when one or more of the three-phase sampling voltages are higher than the set voltage threshold; when the three-phase sampling voltages are lower than the set voltage threshold, not provide the working power supply VDD for the triggering alarm module 2;
[0050] The third output terminal of the voltage signal acquisition module 1 is connected to the input terminal (common points A, B, C) of the power supply control module 4 , and the output terminal of the power supply control module 4 is connected to the third input terminal (working power supply VDD) of the trigger alarm module 2 .
[0051] In this example: See Figure 4The power supply control module 4 includes a fourth field effect transistor V4, a fifth field effect transistor V5, a sixth field effect transistor V6, a seventh field effect transistor V7, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, an eighth diode D8, a ninth diode D9, and a tenth diode D10. The source of the fourth field effect transistor V4 is connected to the power supply VCC, the drain of the fourth field effect transistor V4 is connected to the source of the fifth field effect transistor V5, the drain of the fifth field effect transistor V5 is connected to the source of the sixth field effect transistor V6, the drain of the sixth field effect transistor V6 is connected to one end of the twelfth resistor R12, the other end of the twelfth resistor R12 is connected to the gate of the seventh field effect transistor V7, the source of the seventh field effect transistor V7 is connected to the power supply VCC, and the seventh field effect transistor V6 is connected to the gate of the seventh field effect transistor V7. The drain of the tube V7 is connected to the third input terminal of the trigger alarm module 2, the gate of the fourth field effect tube V4 is connected to one end of the ninth resistor R9, the other end of the ninth resistor R9 is connected to the anode of the eighth diode D8, and the cathode of the eighth diode D8 is connected to the third output terminal of the voltage signal acquisition module 1, the gate of the fifth field effect tube V5 is connected to one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to the anode of the ninth diode D9, and the cathode of the ninth diode D9 is connected to the third output terminal of the voltage signal acquisition module 1, the gate of the sixth field effect tube V6 is connected to one end of the eleventh resistor R11, the other end of the eleventh resistor R11 is connected to the anode of the tenth diode D10, and the cathode of the tenth diode D10 is connected to the third output terminal of the voltage signal acquisition module 1.
[0052] The power supply control module 4 is designed to avoid false triggering. The unbalanced current and load current changes in the fault-free state of the 10KV distribution network may interfere with the detection device, affect the accuracy of the detection, and cause false triggering of the trigger alarm module 2. Therefore, the power supply control module 4 is set. Under normal circumstances, it does not provide the working power supply VDD for the trigger alarm module 2. After the single-phase grounding, the voltage of the other two phases will increase, so that the corresponding three-phase sampling voltage increases. For example, the U line is grounded, the V and W line voltages increase, so that the voltage of the common point A is 0, and the voltage of the common points B and C rises. At this time, the ninth diode D9 and the tenth diode D10 are turned on, so that the fifth field effect tube V5 and the sixth field effect tube V6 are turned off, and the gate of the seventh field effect tube V7 becomes a low level, the seventh field effect tube V7 is turned on, and the power supply VCC provides the working power supply VDD for the trigger alarm module 2 through the seventh field effect tube V7.
[0053] In another embodiment: the fourth field effect transistor V4, the fifth field effect transistor V5, and the sixth MOS tube can be selected from corresponding switch tubes.
[0054] In this example: See Figure 1 and Figure 2 , the 10KV distribution network single-phase grounding fault early warning device also includes:
[0055] The signal transmitting module 5 is used to transmit an alarm signal to the signal receiving module 6 when the alarm module 2 is triggered to work;
[0056] The signal receiving module 6 is used to feed back the alarm signal to the host computer 7 after receiving it;
[0057] The host computer 7 is used to record the triggering alarm module 2 number and the alarm time after receiving the alarm signal, and upload the triggering alarm module 2 number and the alarm time to the cloud platform 8;
[0058] The cloud platform 8 is used to display all the numbers of the trigger alarm module 2 and the alarm time when the numbers of the trigger alarm module 2 exist;
[0059] The input end of the signal transmitting module 5 is connected to the output end of the trigger alarm module 2 , the output end of the signal transmitting module 5 is connected to the input end of the signal receiving module 6 , the output end of the signal receiving module 6 is connected to the input end of the host computer 7 , and the output end of the host computer 7 is connected to the cloud platform 8 .
[0060] There are multiple voltage signal acquisition modules 1, trigger alarm modules 2, self-test modules 3, power supply control modules 4, and signal transmission modules 5, which are arranged in different areas of the 10KV distribution network. When there is an abnormality in any part of the distribution network, it will be fed back to the signal receiving module 6 at the host computer 7 through the signal transmission module 5. The host computer 7 obtains the information and uploads it to the cloud platform 8. The staff can obtain the trigger alarm module 2 number and the corresponding alarm time through the cloud platform 8, which is convenient for the management of the distribution network.
[0061] The present invention is provided with a self-check module 3, which will periodically detect whether the equipment is faulty. When it is normal, it will control the trigger alarm module 2 to work, indicating that the equipment is in good condition; a power supply control module 4 is provided to avoid the alarm module 2 from being mistakenly triggered when there is interference, voltage fluctuation and the like in the distribution network; a signal transmission module 5, a signal receiving module 6, a host computer 7, and a cloud platform 8 are provided to record the alarm information in real time, so that the staff can obtain the distribution network information at a long distance.
[0062] It is obvious 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 features of the present invention. Therefore, the embodiments should be considered as exemplary and non-restrictive in all respects.
[0063] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description 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 may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A 10KV distribution network single-phase grounding fault early warning device, It is characterized in that The 10KV distribution network single-phase grounding fault early warning device includes: The voltage signal acquisition module is used to collect the three-phase voltage of the 10KV distribution network and obtain the three-phase sampling voltage. When the three-phase sampling voltage exists, the voltage signal is output to the trigger alarm module; when there is a phase loss in the three-phase sampling voltage, no voltage signal is output; Trigger alarm module, used for alarm prompt when sampling voltage is not received; A self-check module, which is used to charge the storage device when the voltage signal acquisition module outputs a voltage signal, and when the storage device is charged to a threshold value, drive the trigger alarm module to alarm and discharge the voltage of the energy storage device at the same time; The first output end of the voltage signal acquisition module is connected to the first input end of the trigger alarm module, the second output end of the voltage signal acquisition module is connected to the input end of the self-test module, and the output end of the self-test module is connected to the second input end of the trigger alarm module.
2. According to claim 1, the 10KV distribution network single-phase grounding fault early warning device, It is characterized in that The voltage signal acquisition module includes an AND gate, a fourth resistor, and three signal acquisition units. The three signal acquisition units respectively collect the three-phase voltage of the 10KV distribution network, obtain the three-phase sampling voltage, and input it into the three input ends of the AND gate respectively. The output end of the AND gate is connected to one end of the fourth resistor and the input end of the self-test module, and the other end of the fourth resistor is connected to the first input end of the trigger alarm module.
3. The 10KV distribution network single-phase grounding fault early warning device according to claim 2, It is characterized in that The three signal acquisition units have the same structure, and the difference lies in that the voltages of the 10KV distribution network are collected differently. The signal acquisition unit includes a first voltage transformer, a first diode, a first capacitor, a first resistor, and a second diode. The first voltage transformer collects any phase voltage of the 10KV distribution network. One end of the first voltage transformer is grounded, and the other end of the first voltage transformer is connected to the positive electrode of the first diode. The negative electrode of the first diode is connected to one end of the first capacitor and one end of the first resistor. The other end of the first capacitor is grounded, and the other end of the first resistor is connected to the positive electrode of the second diode. The negative electrode of the second diode is connected to one of the three input ends of the AND gate.
4. The 10KV distribution network single-phase grounding fault early warning device according to claim 1, It is characterized in that The trigger alarm module includes a first field effect transistor, a second triode, a fifth resistor, a sixth resistor, a third field effect transistor, a speaker, and an eleventh diode. The drain of the first field effect transistor is connected to the base of the second triode and the first output end of the voltage signal acquisition module, the source of the first field effect transistor is grounded, the gate of the first field effect transistor is connected to the output end of the self-test module, the emitter of the second triode is grounded, the collector of the second triode is connected to one end of the fifth resistor and the gate of the third field effect transistor, the other end of the fifth resistor is connected to one end of the speaker, the working power supply, and the negative electrode of the eleventh diode, the positive electrode of the eleventh diode is connected to the output end of the self-test module, the other end of the speaker is connected to the drain of the third field effect transistor, the source of the third field effect transistor is connected to one end of the sixth resistor, and the other end of the sixth resistor is grounded.
5. The 10KV distribution network single-phase grounding fault early warning device according to claim 1, It is characterized in that The self-test module includes a seventh resistor, a first potentiometer, a fourth capacitor, an eighth resistor, a seventh diode, and a first thyristor. One end of the seventh resistor is connected to the second output end of the voltage signal acquisition module, the other end of the seventh resistor is connected to one end of the first potentiometer, the other end of the first potentiometer is connected to one end of the eighth resistor, one end of the fourth capacitor, and the negative electrode of the seventh diode, the other end of the fourth capacitor is grounded, the other end of the eighth resistor is connected to the positive electrode of the first thyristor, the negative electrode of the first thyristor is grounded, and the control electrode of the first thyristor is connected to the positive electrode of the seventh diode and the second input end of the trigger alarm module.
6. The 10KV distribution network single-phase grounding fault early warning device according to claim 1, It is characterized in that The 10KV distribution network single-phase grounding fault early warning device also includes: The power supply control module is used to provide working power to the trigger alarm module when one or more phases of the three-phase sampling voltage are higher than the set voltage threshold; when the three-phase sampling voltage is lower than the set voltage threshold, no working power is provided to the trigger alarm module; The third output terminal of the voltage signal acquisition module is connected to the input terminal of the power supply control module, and the output terminal of the power supply control module is connected to the third input terminal of the trigger alarm module.
7. The 10KV distribution network single-phase grounding fault early warning device according to claim 6, It is characterized in that The power supply control module includes a fourth field effect tube, a fifth field effect tube, a sixth field effect tube, a seventh field effect tube, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, an eighth diode, a ninth diode, and a tenth diode. The source of the fourth field effect tube is connected to the power supply, the drain of the fourth field effect tube is connected to the source of the fifth field effect tube, the drain of the fifth field effect tube is connected to the source of the sixth field effect tube, the drain of the sixth field effect tube is connected to one end of the twelfth resistor, the other end of the twelfth resistor is connected to the gate of the seventh field effect tube, the source of the seventh field effect tube is connected to the power supply, and the drain of the seventh field effect tube is connected to the contact The third input terminal of the alarm module, the gate of the fourth field effect transistor is connected to one end of the ninth resistor, the other end of the ninth resistor is connected to the anode of the eighth diode, the cathode of the eighth diode is connected to the third output terminal of the voltage signal acquisition module, the gate of the fifth field effect transistor is connected to one end of the tenth resistor, the other end of the tenth resistor is connected to the anode of the ninth diode, the cathode of the ninth diode is connected to the third output terminal of the voltage signal acquisition module, the gate of the sixth field effect transistor is connected to one end of the eleventh resistor, the other end of the eleventh resistor is connected to the anode of the tenth diode, and the cathode of the tenth diode is connected to the third output terminal of the voltage signal acquisition module.
8. The 10KV distribution network single-phase grounding fault early warning device according to any one of claims 1 to 7, It is characterized in that The 10KV distribution network single-phase grounding fault early warning device also includes: The signal transmitting module is used to transmit an alarm signal to the signal receiving module when the alarm module is triggered to work; The signal receiving module is used to feed back the alarm signal to the host computer after receiving it; The host computer is used to record the triggering alarm module number and alarm time after receiving the alarm signal, and upload the triggering alarm module number and alarm time to the cloud platform; The cloud platform is used to display all the trigger alarm module numbers and the alarm time when the trigger alarm module numbers exist; the input end of the signal transmitting module is connected to the output end of the trigger alarm module, the output end of the signal transmitting module is connected to the input end of the signal receiving module, the output end of the signal receiving module is connected to the input end of the host computer, and the output end of the host computer is connected to the cloud platform.