External loop monitoring device for 10KV distribution network switchgear

Abstract

The invention relates to the field of protection devices for 10KV distribution network switch equipment, in particular to an external loop monitoring device for 10KV distribution network switch equipment. The device is an external monitoring device, the device realizes detection of a coil loop through a switching-on and switching-off coil loop incorporated into a secondary loop of original equipment and a power supply loop of the device, determines whether the secondary loop has a fault, outputs the fault to a fault indication device of the switch equipment through a passive idle contact, and also can output the fault to a DTU at the same time. And remote monitoring management of the distribution automation master station is realized. The device has the advantages that the device is an external device, the manufacturing cost is low (the manufacturing cost of a single device is within 100 yuan), the construction workload is small, an original secondary loop and an original secondary loop in a protection device are not changed basically, and an original device loop is used for expansion and full utilization.

Description

Technical Field

[0001] The present invention relates to the field of 10KV distribution network switch equipment protection devices, and in particular to an external circuit monitoring device for 10KV distribution network switch equipment. Background Art

[0002] In the power distribution network architecture of the State Grid, most of the 10KV distribution network switch equipment protection devices do not have a circuit monitoring function. When the opening and closing circuit fails during operation, it cannot be discovered in time. When the protected line has a short circuit or other faults that require the switch device to operate, the equipment refuses to operate and fails to trip. This puts great pressure on the reliability of power distribution and operation and maintenance. Faults in the secondary circuit cannot be discovered during daily inspections and maintenance work, and special technical inspections cannot be performed on the running equipment. In order to solve this problem, there is currently only one way to solve this problem - replacing the protection device with a circuit monitoring function. The equipment cost is high, the installation and construction are difficult and the cost is high, and there are certain safety risks. Therefore, there are many devices with secondary circuit failures, but there are not many actual implementations of replacing the protection device to solve related problems.

[0003] The demand for secondary circuit monitoring is becoming more and more important. In recent years, newly installed switch equipment and State Grid standard DTU and FTU equipment have all been equipped with circuit monitoring functions as standard, and have played an important role.

[0004] However, there is currently no more effective solution for the large amount of existing equipment in operation due to reasons such as transformation costs and construction difficulty.

[0005] At present, there are also urgent line application locations for switchgear without loop monitoring function. By replacing the protection device with loop monitoring function, the project cost is high, and the size and wiring of the new protection device are different from the original protection device. The construction site has complex processes such as hot work modification, which also has certain technical difficulties and safety risks. Therefore, there are very few projects that really carry out relevant technical transformation and upgrading in the power grid.

[0006] On November 9, 2024, a search was conducted in the Chinese Patent Publication Database with "external and loop and monitoring and switch and passive" as abstract keywords, and the option of allowing synonym expansion was checked, but no relevant literature was found.

[0007] On November 9, 2024, an abstract search for "external and loop and monitoring and switch and passive" was conducted on China National Knowledge Infrastructure, and no relevant literature was found.

[0008] On November 9, 2024, a search was conducted on the website of the United States Patent and Trademark Office for “External with circuit with monitoring with switch with passive” and no relevant literature was found; the search URL was https: / / ppubs.uspto.gov / pubwebapp / .

[0009] On November 9, 2024, a search was conducted on the Korean Patent Office with the term "External and circuit and monitoring and switch and passive"; the search URL is http: / / eng.kipris.or.kr / enghome / main.jsp; the following were found: 1020147027309 (2013.02.26) Laser splitting method and system; 1020127003541 (2010.08.17) Distributed external and internal wireless sensor system; 1020227031077 (2021.03.18) Method and device for suppressing substrate current in an IC semiconductor substrate; 1020147025968 (2014.07.08) Motion monitoring; 1020187033924 (2017.04.13) Sealing system and method for installing a sealing system; 1020140028342 (2014.03.11) Navigation system with dynamic update mechanism; 1020160093592 (2016.07.22) Additive manufacturing system; 1020140003220 (2014.01.10 Power supply device; 1020127021452 (2011.01.26) Digital jukebox device with improved user interface; 1020167026758 (2014.07.08) Motion monitoring; 1020077022296 (2006.03.07) Optical phase conjugated laser diode; 1020127029574 (2011.04.15) Front lighting device; 1020190141454 (2019.11.07) Vehicle public service method in autonomous driving system; 1020197000920 (2011.04.15) Front lighting device; 1020127029573 (2011.04.15) Lighting equipment; 1020087002382 (2005.10.06) Multi-purpose positioning device, communication, medical, control system; 1020107015800 (2008.12.21) Distributed energy conversion system; 1020127004459 (2008.12.21) Distributed energy conversion system; 1020077004867 (2005.08.01) Electronic stylus; On November 9, 2024, a search was conducted on WIPO's https: / / patentscope2.wipo.int / for "External and circuit and monitoring and switch and passive" and the following irrelevant documents were found: Appl.No 201410126500.X Monitoring method of variable gain burst receiving optical power monitoring circuit and variable gain burst receiving optical power monitoring circuit; Appl.No 10695040 A float switch transient suppression device; Appl.No 05679608 Multiplexed data monitoring system; Appl.No 202211575212.3 A passively modulated laser with fully automatic stable control; Appl.No 202010441177.0 A lithium battery passivation detection and activation circuit, method and device; Appl.No 97400065 A system state change display device; Appl.No 9600625 A device for indicating a change in the state of a system; Appl.No 201302038 Apparatus and method for transmitting data signals propagating along a bidirectional communication path within a data processing device; Appl.No 17140111 has an RFID based control subsystem with tag switches using an electric RFID tag and an externally controlled RFID tag; Appl.No 202222402686.X An online performance monitoring device for passive intermodulation test equipment; Appl.No 202211271095.1 A piezoelectric self-sensing passive vibration suppression control circuit and method based on switch stiffness; Appl.No 202021515745.9 An intelligent battery charging monitoring integrated switching power supply module; Appl.No 202123382040.1A photovoltaic confluence monitoring device; Appl.No 202016001119216A multifunctional novel LED with adjustable power supply; Appl.No 201310400536.8 A passive tire pressure monitor for automobiles; Appl.No 11771684 Event-driven context switching in passive RFID tags; Appl.No PCT / IL2011 / 000323 Event-driven context switching in passive RFID tags; Appl.No 13641907 Event-driven context switching in passive RFID tags; Appl.No 202210169384.4 An adaptive voltage source synchronous switch damping piezoelectric vibration control circuit; Appl.No 201710820645.3 An infrared microwave dual monitoring security device; Appl.No 201621324287.4 A heating pipeline system suitable for wireless monitoring of a passive speed regulating valve; Appl.No 201720569141.4 A low power consumption communication equipment environment monitoring system; Appl.No 201521096605.1 An independently controlled multi-channel battery monitoring controller; Appl.No 2013001001 A shunt monitor with Bluetooth; Appl.No 11381623 Automatic communication systems for local suppression of temperature rise or for extinguishing fire in electrical equipment connected to a power supply; Appl.No PA 2024 70005 Automatic communication systems for local suppression of temperature rise or extinguishing of fire in electrical equipment; Appl.No 20236391 Automatic communication system for local suppression of temperature rise or extinguishing of fire in electrical equipment connected to a power supply; Appl.No 2351441 Automatic communication system for local suppression of temperature rise or extinguishing of fire in electrical equipment connected to a power supply; Appl.No 202221025178 Portable temperature recording device supporting WEB browser.

[0010] On November 9, 2024, a search was conducted on the Japan Patent Office website https: / / www.j-platpat.inpit.go.jp / for "External and circuit and monitoring and switch and passive", but no relevant documents were found.

[0011] Completely different from the concept of this patent. Summary of the invention

[0012] Purpose of the invention: To provide a better external circuit monitoring device for 10KV distribution network switch equipment. The specific purpose can be seen in the multiple substantial technical effects of the specific implementation part.

[0013] In order to achieve the above purpose, the present invention adopts the following technical solutions: The external circuit monitoring device of 10KV distribution network switch equipment is characterized in that it is an external monitoring device. The device detects the coil circuit by incorporating the opening and closing coil circuit in the secondary circuit of the original equipment, and confirms whether there is a fault in the secondary circuit through the power supply circuit of the device itself. The fault indication device of the switch equipment is output through a passive empty contact, and can also be output to the DTU at the same time, so as to realize remote monitoring and management of the distribution automation master station.

[0014] A further technical solution of the present invention is that the P2 terminal of the device is an input terminal, the P2 terminal pin 1 and the P2 terminal pin 2 are input operation power supplies, and the P2 terminal pin 3 and the P2 terminal pin 4 are connected in parallel to the opening and closing coil circuits of the switch device; Terminal P1 is the output terminal, Pin 2 and Pin 5 of Terminal P1 are the signal common terminals, Pin 3 and Pin 6 of Terminal P1 are the normally closed output terminals, and Pin 1 and Pin 4 of Terminal P1 are the normally open output terminals. The P1 terminal contact outputs a fault indication device of the switchgear, or a DTU device, or outputs a fault signal to both the fault indication device and the DTU device.

[0015] A further technical solution of the present invention is that the first pin of the P2 terminal is connected in parallel to two 24V power supplies, each 24V power supply is connected to a D4148 diode, each 24V power supply is connected to a SS8050 transistor, and the SS8050 transistor is connected to an EL3H7 optocoupler and a resistor; 0805 resistor is connected to P2 terminal 2 pin; Two EL3H7 optocouplers are connected to P2 terminal 3 and P2 terminal 4 through resistors respectively; The P2 terminal is incorporated into the closing and opening coil circuit in the secondary circuit of the original equipment. The coil circuit is detected through the device's own power supply, i.e., the 24V power supply and circuit, to confirm whether there is a fault in the secondary circuit. The fault indication device of the switch device is output through the passive open contacts, i.e., K1 and K2. It can also be output to the DTU at the same time to realize remote monitoring and management of the distribution automation master station.

[0016] A further technical solution of the present invention is that when a fault occurs in the opening and closing coil circuit, the passive idle contacts, namely K1 and K2, receive a signal and confirm the fault.

[0017] A further technical solution of the present invention is that the P2 terminal 1 pin of the P2 terminal is connected to the positive power supply, and the P2 terminal 2 pin is connected to the negative power supply.

[0018] A further technical solution of the present invention is that, when the closing coil is normal, the optical coupler U1 is turned on through the positive power supply of P2-1->R3->R11->p2-3 closing coil positive->p1-2 power supply negative, and the optical coupler is turned on, and the relay K2 acts as a passive switch for switching; when the closing coil is disconnected, the optical coupler U1 loses power and K2 returns to the passive switch switching.

[0019] A further technical solution of the present invention is that the wiring method of the P1 terminal is as follows: Method 1: K1 and K2 are normally closed and connected in series. When all the opening and closing coils are blocked, K1 and K2 are normally closed and turned on, and the fault output remote signal is turned on. When at least one of the opening and closing coils is normal, at least one of K1 and K2 is blocked, and the fault output remote signal is blocked.

[0020] A further technical solution of the present invention is that the wiring method of the P1 terminal is the following method 2: K1 and K2 are normally open and connected in parallel. When all the opening and closing coils are blocked, K1 and K2 are normally open and not conducting, and the fault output remote signal is not conducting. When at least one of the opening and closing coils is normal, at least one of K1 and K2 is normally open and closed, and the fault output remote signal is conducting.

[0021] The present invention adopting the above technical solution has the following beneficial effects compared with the prior art: the present invention is an external device with low cost (within 100 yuan for a single unit), small construction workload, and basically no changes to the original secondary circuit and the original secondary circuit in the protection device, and the original device circuit is used for expansion and full utilization. The device detects the coil circuit by incorporating the split coil circuit in the secondary circuit of the original equipment, and confirms whether there is a fault in the secondary circuit through the power supply circuit of the device. It outputs to the fault indication device of the switch device through the passive empty contact, and can also output to the DTU at the same time, realizing remote monitoring and management of the distribution automation master station. Effectively improve the operating reliability of the switch device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to further illustrate the present invention, the following is further described in conjunction with the accompanying drawings: Figure 1 a circuit diagram for the invention; Figure 2 A further wiring connection diagram for the invention; Figure 3 This is the first wiring connection diagram of P1; Figure 4 This is the second wiring connection diagram of P1. DETAILED DESCRIPTION

[0023] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific circumstances.

[0024] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0025] This patent provides a variety of parallel solutions. Different expressions belong to improved solutions or parallel solutions based on the basic solution. Each solution has its own unique characteristics. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] Embodiment 1: Combination Figure 1 ; 10KV distribution network switch equipment external circuit monitoring device, characterized in that it is an external monitoring device, the device is integrated into the opening and closing coil circuit in the secondary circuit of the original equipment, and realizes the detection of the coil circuit through the power supply circuit of the device itself, confirms whether there is a fault in the secondary circuit, and outputs it to the fault indication device of the switch equipment through passive empty contacts, and can also output it to DTU at the same time, so as to realize remote monitoring and management of the distribution automation master station.

[0027] A further technical solution of the present invention is that the P2 terminal of the device is an input terminal, the P2 terminal pin 1 and the P2 terminal pin 2 are input operation power supplies, and the P2 terminal pin 3 and the P2 terminal pin 4 are connected in parallel to the opening and closing coil circuits of the switch device; Terminal P1 is an output terminal, pin 2 of terminal P1 and pin 5 of terminal P1 are signal common terminals, pin 3 of terminal P1 and pin 6 of terminal P1 are normally closed outputs, and pin 1 of terminal P1 and pin 4 of terminal P1 are normally open outputs; the contact of terminal P1 is output to the fault indication device of the switching device, or the DTU device, or the fault signal is output to the fault indication device and the DTU device at the same time.

[0028] The 1st pin of the P2 terminal is connected to two 24V power supplies in parallel. Each 24V power supply is connected to a D4148 diode. Each 24V power supply is connected to a SS8050 transistor. The SS8050 transistor is connected to an EL3H7 optocoupler and a resistor. 0805 resistor is connected to P2 terminal 2 pin; Two EL3H7 optocouplers are connected to P2 terminal 3 and P2 terminal 4 through resistors respectively; The P2 terminal is incorporated into the closing and opening coil circuit in the secondary circuit of the original equipment. The coil circuit is detected through the device's own power supply, i.e., the 24V power supply and circuit, to confirm whether there is a fault in the secondary circuit. The fault indication device of the switch device is output through the passive open contacts, i.e., K1 and K2. It can also be output to the DTU at the same time to realize remote monitoring and management of the distribution automation master station.

[0029] When a fault occurs in the opening and closing coil circuit, the passive open contacts, namely K1 and K2, receive a signal and confirm the fault.

[0030] The substantial technical effects and implementation process of the technical solution hereof, i.e. the basic functions, are as follows: The present invention is an external device with low cost (within 100 yuan per unit) and small construction workload. The original secondary circuit and the original secondary circuit in the protection device are basically unchanged, and the original device circuit is used for expansion and full utilization. The device is integrated into the split coil circuit in the secondary circuit of the original equipment, and the coil circuit is detected through the power supply circuit of the device to confirm whether there is a fault in the secondary circuit. The fault indication device of the switch device is output through the passive empty contact, and it can also be output to the DTU at the same time to realize remote monitoring and management of the distribution automation master station. Effectively improve the operating reliability of the switch device.

[0031] The P2 terminal of this device is the input terminal, the P2 terminal pin 1 and the P2 terminal pin 2 are the input operating power supply, and the P2 terminal pin 3 and the P2 terminal pin 4 are connected in parallel to the opening and closing coil circuits of the switch equipment. The P1 terminal is the output terminal, the P1 terminal pin 2 and the P1 terminal pin 5 are the signal common terminals, the P1 terminal pin 3 and the P1 terminal pin 6 are the normally closed outputs; the P1 terminal pin 1 and the P1 terminal pin 4 are the normally open outputs. The device can select any contact to output to the fault indication device of the switch equipment, or the DTU device, and can also output fault signals to the fault indication device and the DTU at the same time. The device of the present invention has been put into experimental use in multiple user ring network cabinet equipment and medium-voltage switches in distribution rooms. At present, the accuracy of detecting loop faults is high, the operating state is stable, and the application effect is good.

[0032] Pin 1 of the P2 terminal is connected to the positive power supply, and pin 2 of the P2 terminal is connected to the negative power supply.

[0033] Combination Figure 2 When the closing coil is normal, the optocoupler U1 is connected through the positive power supply of P2-1->R3->R11->p2-3 closing coil positive->p1-2 power supply negative, the optocoupler is turned on, and the relay K2 acts as a passive switch; when the closing coil is disconnected, the optocoupler U1 loses power and K2 returns to the passive switch.

[0034] Combination Figure 3 The wiring method of P1 terminal is as follows: 1. K1 and K2 are normally closed in series. When all the opening and closing coils are blocked, K1 and K2 are normally closed and turned on, and the fault output remote signal is turned on. When at least one of the opening and closing coils is normal, at least one of K1 and K2 is blocked, and the fault output remote signal is blocked.

[0035] Combination Figure 4 , the wiring method of P1 terminal is as follows 2: K1 and K2 are normally open and connected in parallel. When all the opening and closing coils are blocked, K1 and K2 are normally open and not conducting, and the fault output remote signal is not conducting. When at least one of the opening and closing coils is normal, at least one of K1 and K2 is normally open and closed, and the fault output remote signal is conducting.

[0036] Innovatively, each of the above effects exists independently, and a set of structures can be used to combine the above results.

[0037] It should be noted that the multiple solutions provided by this patent include the basic solution itself, which are independent of each other and do not restrict each other, but they can also be combined with each other without conflict to achieve multiple effects together.

[0038] The basic principle, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the protection required.

Claims

1. 10KV distribution network switch equipment external circuit monitoring device, characterized in that: It is an external monitoring device. The device is integrated into the opening and closing coil circuit of the original equipment's secondary circuit. It detects the coil circuit through the device's own power supply circuit, confirms whether there is a fault in the secondary circuit, and outputs it to the fault indication device of the switch equipment through passive open contacts. It can also output it to the DTU at the same time, realizing remote monitoring and management of the distribution automation master station.

2. The 10KV distribution network switch equipment external circuit monitoring device according to claim 1, characterized in that: The P2 terminal of this device is the input terminal, the P2 terminal pin 1 and P2 terminal pin 2 are the input operation power supply, and the P2 terminal pin 3 and P2 terminal pin 4 are connected in parallel to the opening and closing coil circuits of the switch equipment; Terminal P1 is the output terminal, Pin 2 and Pin 5 of Terminal P1 are the signal common terminals, Pin 3 and Pin 6 of Terminal P1 are the normally closed output terminals, and Pin 1 and Pin 4 of Terminal P1 are the normally open output terminals. The P1 terminal contact outputs a fault indication device of the switchgear, or a DTU device, or outputs a fault signal to both the fault indication device and the DTU device.

3. The 10KV distribution network switch equipment external circuit monitoring device according to claim 2, characterized in that: The 1st pin of the P2 terminal is connected to two 24V power supplies in parallel. Each 24V power supply is connected to a D4148 diode. Each 24V power supply is connected to a SS8050 transistor. The SS8050 transistor is connected to an EL3H7 optocoupler and a resistor. 0805 resistor is connected to P2 terminal 2 pin; Two EL3H7 optocouplers are connected to P2 terminal 3 and P2 terminal 4 through resistors respectively; The P2 terminal is incorporated into the closing and opening coil circuit in the secondary circuit of the original equipment. The coil circuit is detected through the device's own power supply, i.e., the 24V power supply and circuit, to confirm whether there is a fault in the secondary circuit. The fault indication device of the switch device is output through the passive open contacts, i.e., K1 and K2. It can also be output to the DTU at the same time to realize remote monitoring and management of the distribution automation master station.

4. The 10KV distribution network switch equipment external circuit monitoring device according to claim 3, characterized in that: When a fault occurs in the opening and closing coil circuit, the passive open contacts, namely K1 and K2, receive a signal and confirm the fault.

5. The 10KV distribution network switch equipment external circuit monitoring device according to claim 4, characterized in that: Pin 1 of the P2 terminal is connected to the positive power supply, and pin 2 of the P2 terminal is connected to the negative power supply.

6. The 10KV distribution network switch equipment external circuit monitoring device according to claim 5, characterized in that: When the closing coil is normal, the optocoupler U1 passes through the positive power supply of P2-1->R3->R11->p2-3 closing coil positive->p1-2 power supply negative, the optocoupler is turned on, and relay K2 acts as a passive switch for switching; when the closing coil is disconnected, the optocoupler U1 loses power and K2 returns to the passive switch switching.

7. The 10KV distribution network switch equipment external circuit monitoring device according to claim 5, characterized in that: The wiring method of the P1 terminal is as follows: Method 1: K1 and K2 are normally closed in series. When all the opening and closing coils are blocked, K1 and K2 are normally closed and turned on, and the fault output remote signal is turned on. When at least one of the opening and closing coils is normal, at least one of K1 and K2 is blocked, and the fault output remote signal is blocked.

8. The 10KV distribution network switch equipment external circuit monitoring device according to claim 5, characterized in that: The wiring method of the P1 terminal is as follows: Method 2: K1 and K2 are normally open and connected in parallel. When all the opening and closing coils are blocked, K1 and K2 are normally open and not conducting, and the fault output remote signal is not conducting. When at least one of the opening and closing coils is normal, at least one of K1 and K2 is normally open and closed, and the fault output remote signal is conducting.

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