Band-aid type temporary protection device and use method thereof

Abstract

The invention discloses a band-aid type temporary protection device and a use method thereof, and relates to the technical field of power system protection. The device comprises a temporary protection structure, a current sampling module and a voltage sampling module; the current sampling module and the voltage sampling module collect current and voltage signals through a non-intrusive open current clamp and a parallel voltage terminal respectively, the state of the circuit breaker is controlled by combining three-section over-current protection logic judgment of a processing module in the temporary protection structure, the protection function is ensured, and meanwhile, the current and voltage signals are collected through the non-intrusive open current clamp and the parallel voltage terminal. And the problems of complicated operation and high risk in the traditional method are thoroughly solved.

Description

Technical Field

[0001] The present application relates to the technical field of power system protection, and particularly relates to a band-aid type temporary protection device and a using method thereof. Background Technique

[0002] In a power system, when a 10kV line protection device of a substation is undergoing temporary maintenance or replacement, a device that can temporarily replace the original protection device is required to prevent the line from operating without protection, thereby avoiding the expansion of the influence range caused by the operation of the superior protection.

[0003] Traditional temporary protection requires opening the CT (Current Transformer) circuit and connecting the protection current to the temporary protection through a terminal block, which not only increases the operation complexity but also poses a risk of CT secondary open circuit.

[0004] Therefore, it is particularly important to develop a temporary protection device that reduces operation complexity and improves safety. Summary of the Invention

[0005] The purpose of the present application is to provide a band-aid type temporary protection device and a using method thereof, which can solve the problems of complex operation and high risk in the traditional method.

[0006] To achieve the above purpose, the present application provides the following solutions:

[0007] In a first aspect, the present application provides a band-aid type temporary protection device, including:

[0008] A current sampling module, including at least 3 current sampling channels, each of which is connected to the secondary wire of the current transformer through an opening type current clamp for collecting the current signal of the secondary circuit of the current transformer;

[0009] A voltage sampling module, including at least 4 voltage terminals, each of which is connected in parallel with the secondary circuit of the voltage transformer for collecting the voltage signal of the secondary circuit of the voltage transformer;

[0010] The temporary protection structure is respectively connected to the current sampling module and the voltage sampling module;

[0011] The processing module in the temporary protection structure is used to execute a three-stage overcurrent protection logic judgment process according to the current signal and the voltage signal, judge whether the overcurrent protection condition is triggered, obtain a judgment result, and control the state of the circuit breaker according to the judgment result.

[0012] In a second aspect, the present application provides a method for using a band-aid type temporary protection device. The method for using the band-aid type temporary protection device is implemented by using the band-aid type temporary protection device described in the first aspect. The method for using the band-aid type temporary protection device includes:

[0013] Non-invasively collect the current signal of the secondary circuit of the current transformer through an open-type current clamp;

[0014] Non-invasively collect the voltage signal of the secondary circuit of the voltage transformer through a voltage terminal;

[0015] The processing module executes a three-stage overcurrent protection logic judgment process based on the current signal and the voltage signal, judges whether the overcurrent protection condition is triggered, obtains a judgment result, and controls the state of the circuit breaker according to the judgment result.

[0016] According to the specific embodiments provided by the present application, the present application has the following technical effects:

[0017] The present application provides a band-aid type temporary protection device and a method for using the same. The device includes a temporary protection structure, a current sampling module, and a voltage sampling module. The current sampling module and the voltage sampling module respectively collect current and voltage signals through a non-invasive open current clamp and a shunt voltage terminal, and combine the three-stage overcurrent protection logic judgment of the processing module in the temporary protection structure to control the state of the circuit breaker. While ensuring the protection function, it completely solves the problems of complex operation and high risk in the traditional method. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of a band-aid type temporary protection device in Embodiment 1 of the present application;

[0020] Figure 2 It is a schematic flow diagram of a method for using a band-aid type temporary protection device provided in Embodiment 2 of the present application. Detailed Embodiments

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are only a part rather than all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0022] In order to make the above objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0023] Embodiment 1

[0024] As Figure 1 shown, a band-aid type temporary protection device provided in this embodiment includes:

[0025] A current sampling module, including at least 3 current sampling channels. Each channel is connected to the secondary wire of the current transformer through an open-type current clamp for collecting the current signal of the secondary circuit of the current transformer. The open-type design of the current clamp facilitates current collection without disconnecting the CT secondary wire, reducing the risk of CT secondary open circuit. The selected type of current clamp is a protection class, and the transient current accuracy reaches 5P and 10P; the steady-state current accuracy is not required.

[0026] A voltage sampling module, including at least 4 voltage terminals. Each voltage terminal is connected in parallel with the secondary circuit of the voltage transformer for collecting the voltage signal of the secondary circuit of the voltage transformer.

[0027] The temporary protection structure (i.e., the temporary protection device in Figure 1 ) is respectively connected to the current sampling module and the voltage sampling module.

[0028] The processing module in the temporary protection structure is used to execute a three-stage overcurrent protection logic judgment process according to the current signal and the voltage signal, judge whether the overcurrent protection condition is triggered to obtain a judgment result, and control the state of the circuit breaker according to the judgment result.

[0029] The temporary protection structure includes a housing and a circuit structure. The circuit structure is located inside the housing, and both the current sampling module and the voltage sampling module are located outside the housing.

[0030] The housing design needs to be lightweight and portable, with a weight less than 5 kg. Preferably, magnetic attraction, suspension, etc. are used as installation methods to install it on external equipment, where the external equipment includes a 10 kV switch cabinet or a protection standby screen.

[0031] The circuit structure includes a processing module, a communication module, a power supply module, and a switch quantity output module.

[0032] The processing module also has a protection setting function, which supports remote modification of setting parameters through a mobile phone APP; a soft pressure plate throw-in and throw-out function for flexibly enabling or disabling protection logic; and a fault recording function for recording current and voltage waveform data before and after a fault occurs.

[0033] The communication module is connected to the processing module and the client respectively, supports local (wifi, bluetooth) and remote (4G, 5G) communication modes, and is used to transmit the operating status of the temporary protection structure, real-time collected data, circuit breaker status data, event records and fault recording information to the client, wherein the real-time collected data includes the current signal and the voltage signal, and the client includes a mobile phone or a remote monitoring center.

[0034] When the client is a mobile phone, artificial intelligence can be used to perform preliminary fault analysis, generate and upload a fault report, and provide a preliminary disposal plan.

[0035] The power module is connected to the processing module and includes a battery and an AC220V power supply, and is used to provide power to ensure that the protection device can work normally in different environments.

[0036] A switch output module is connected to the processing module, comprising one alarm channel and at least one trip channel, and is used to output an alarm signal to an alarm device and a trip command to the circuit breaker when the judgment result is yes, wherein the alarm signal and the trip command are signals generated by the processing module.

[0037] Specifically, the switch output module includes 1 alarm channel and 2 trip channels (1 for use and 1 for backup). The main trip channel is used to directly control the circuit breaker trip coil and perform the trip action. The backup trip channel is used to automatically take over when the main channel fails to ensure the reliability of the protection action. Set up a redundancy mechanism: judge the status of the main channel through hardware self-test or software heartbeat monitoring to achieve seamless switching.

[0038] The switch output module can also be set with an output expansion function (reclosing function realization), adding an output channel to send a closing command to the circuit breaker to restore power supply.

[0039] Logical linkage:

[0040] The processing module confirms that the fault has been cleared and the reclosing conditions are met (such as delay end and voltage recovery).

[0041] The closing signal is sent through the newly added output channel to drive the circuit breaker closing coil. The newly added output channel is independent of the trip channel to avoid secondary faults caused by misoperation.

[0042] The above - mentioned band - aid - type temporary protection device of this embodiment can be applied to two - phase sampling method and three - phase sampling method, adapt to symmetrical faults (three - phase short - circuit) and asymmetrical faults (single - phase grounding, etc.), and can be applied to a wider range of typical scenarios.

[0043] As an optional implementation method, the circuit structure can also be set whether to include a digital input module according to requirements. When it is necessary to set up a digital input module, 1 - 2 input channels can be added to the digital input module to receive external signals (such as reclosing trigger instructions, fault reset signals).

[0044] The band - aid - type temporary protection device of this embodiment also includes a camera module and a voice communication module. The camera module is a rotatable 360° camera. After the band - aid - type temporary protection device is arranged at the scene, the on - site environment can be remotely monitored through the camera module, which is convenient for personnel to handle online.

[0045] The processing module can also generate a fault analysis report according to the fault recording and protection device action records according to the protection action principle, upload the generated fault analysis report to the cloud for storage and backup. The fault analysis report includes device model, version number, check code, printing time, action sequence number, action time, action phase, relative time, action element, digital input at startup, fault recording waveform, fault analysis, inferred accident information, and event level.

[0046] The band - aid - type temporary protection device is equipped with interfaces such as USB, type - C, network port, and printing serial port, and supports direct printing of the fault analysis report.

[0047] The temporary protection structure is connected to the current and voltage sampling modules by test leads, and the current and voltage sampling modules are detachable. Each module inside the temporary protection structure is connected by internal lines to form a complete protection system. The current and voltage sampling modules transmit the collected signals to the processing module. After the processing module processes and analyzes the signals, it makes a protection judgment according to the preset protection setting values, and executes a tripping or alarm operation through the digital output module. At the same time, the communication module transmits the operating status and data information of the temporary protection structure to the mobile phone or the remote monitoring center.

[0048] A portable band - aid - type temporary protection device provided in this embodiment, which uses a current clamp to collect the secondary current of the operating CT without disconnecting the wire, by:

[0049] Open - type current clamp design: directly clamp on the CT secondary wire to collect current without disconnecting the wire, avoiding the risk of secondary open - circuit caused by the necessity of disconnecting the CT circuit in the traditional method.

[0050] Parallel voltage acquisition: The voltage terminals are directly connected to the secondary circuit of the PT (Potential Transformer) in parallel, without the need to modify the original wiring, simplifying the operation process.

[0051] Portability and rapid deployment: The device is lightweight and compact, supports magnetic adsorption or hanging installation, can be rapidly deployed, and reduces maintenance time.

[0052] Therefore, this device not only avoids the risk of CT secondary open circuit but also simplifies the operation steps, significantly improving safety and efficiency.

[0053] The band-aid type temporary protection device provided in this embodiment has characteristics similar to those of a band-aid, which are reflected in the following aspects:

[0054] 1. Portability and lightweight design

[0055] Volume and weight: The weight of the device housing is less than 5 kg, and the size is similar to that of an ordinary multimeter. It is lightweight and easy to carry, and can be operated with one hand.

[0056] Installation method: Supports non-invasive installations such as magnetic adsorption and hanging, without complex fixation, similar to the "apply and use" of a band-aid.

[0057] 2. Rapid deployment and simple operation

[0058] Non-invasive acquisition:

[0059] Current clamp: The open-type design is directly clamped on the CT secondary wire, without the need to disconnect the line, and the operation is as simple as "attaching".

[0060] Voltage terminal: The parallel wiring is directly connected to the PT secondary circuit without modifying the original circuit.

[0061] Ready-to-use: It only takes a few minutes from installation to activation, meeting the rapid needs of temporary maintenance, similar to the instant protection function of a band-aid.

[0062] 3. Temporary nature and flexible adaptation

[0063] Scene adaptation: Specifically designed for temporary maintenance or replacement of protection devices. After completion, it can be quickly removed without leaving traces and without affecting the original system.

[0064] Flexible expansion: In the long term, it supports reclosing function, post-acceleration function, overload function, and low-frequency load shedding function. The modular design can adapt to different requirements, similar to the "use as needed" of a band-aid.

[0065] 4. Risk avoidance and safety protection

[0066] Avoid CT secondary open circuit: The non-invasive design of the current clamp completely eliminates the risk of traditional wire-disconnecting operations, just like a band-aid avoids wound exposure.

[0067] Dual power supply guarantee: The battery and AC220V power supply are adapted to different environments to ensure continuous and reliable operation during temporary protection.

[0068] 5. Shape and functional metaphor

[0069] "Band-aid" shape: The device may adopt a flattened and compact structure, be attached to the surface of the device for installation, and visually echo the attachment characteristics of the band-aid.

[0070] Functional metaphor:

[0071] Temporary coverage: Provide temporary coverage at the "wound" (protection loss) of the system to prevent the problem from expanding.

[0072] Quick repair: Through functions such as three-stage overcurrent protection and communication monitoring, quickly restore the security of the system.

[0073] In summary, the band-aid type temporary protection device provided in this embodiment uses an open-type current clamp and does not require disconnecting the CT secondary wire, which simplifies the installation process and reduces the operation risk, and this is also similar to the convenience of the band-aid. At the same time, the weight of the device is less than 5 kg, the shell design is lightweight, and it supports magnetic adsorption or hanging installation methods, which further reflect the "band-aid type" portability and stick-on-and-use characteristics.

[0074] Embodiment 2

[0075] As Figure 2 shown, this embodiment provides a method for using a band-aid type temporary protection device. The method for using the band-aid type temporary protection device is executed using the band-aid type temporary protection device described in Embodiment 1. The method for using the band-aid type temporary protection device includes:

[0076] S1, non-invasively collect the current signal of the secondary circuit of the current transformer through an open-type current clamp;

[0077] S2, non-invasively collect the voltage signal of the secondary circuit of the voltage transformer through a voltage terminal;

[0078] S3, the processing module executes a three-stage overcurrent protection logic judgment process according to the current signal and the voltage signal, judges whether the overcurrent protection condition is triggered, obtains a judgment result, and controls the state of the circuit breaker according to the judgment result.

[0079] Compared with the prior art, the method for using the band-aid type temporary protection device based on the band-aid type temporary protection device described in Embodiment 1 has the following advantages:

[0080] 1. The device is small in size and light in weight, making it convenient to carry and install.

[0081] 2. The current is collected by a current clamp without disconnecting the wire, reducing the risk of CT secondary open circuit and greatly lowering the risks to personnel and equipment.

[0082] 3. It has the basic three-stage overcurrent protection function, which can ensure the safe operation of the line during temporary maintenance or replacement of the protection device.

[0083] 4. It supports local and remote communication methods, and can transmit the operating status and data information of the protection device to the mobile APP or the remote monitoring center in real time, facilitating remote monitoring and management by maintenance personnel.

[0084] 5. The open-type current clamp for current measurement has the following advantages compared with other current transformer devices:

[0085] a. Convenience: It is not necessary to disconnect the circuit or strip the cable to measure the current. Just clamp the current clamp on the wire to measure the current, with simple and convenient operation, especially suitable for on-site testing and maintenance work.

[0086] b. Safety: Since there is no need to contact the live conductor, using an open-type current clamp can avoid the risk of electric shock and improve the safety of the measurement process.

[0087] c. Wide application range: It can measure current under high-current conditions without special modification.

[0088] d. Portability: It is usually designed to be light and easy to carry, suitable for mobile work and current detection in narrow spaces.

[0089] 6. The band-aid type temporary protection device has a similar size to an ordinary multimeter, highlighting its advantages in miniaturization and lightweight. Compared with other traditional temporary protection devices, it has the following characteristics:

[0090] a. Portability: Its small size and lightweight design make it more convenient to carry and use, suitable for applications in on-site, narrow spaces or occasions where it is inconvenient to use large protection devices.

[0091] b. Quick deployment: The band-aid type design enables very fast installation and disassembly, and can quickly complete the deployment of the protection function when needed, without cumbersome operations or complex fixing devices.

[0092] c. Flexibility and adaptability: Due to its miniaturized design, this protection device can be applied to the surfaces of various sizes and shapes of equipment, with a wide coverage and greater flexibility.

[0093] d. Cost reduction and space saving: Its lightweight feature not only reduces the overall cost of the equipment, but also saves the space requirements during storage and use, and is very suitable for portable and mobile application scenarios.

[0094] e. Easy operation: Users can operate this protection device as conveniently as using an ordinary multimeter, which reduces the operation threshold and improves its popularity.

[0095] f. Easy integration and compatibility: Due to its miniaturized and modular design, this device can be easily integrated into various systems without significantly modifying the original structure. It has better compatibility with different devices and systems, making it more convenient to apply in various scenarios.

[0096] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0097] Specific examples are used in this article to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A band-aid type temporary protection device, characterized in that, The band-aid type temporary protection device includes: A current sampling module, including at least 3 current sampling channels. Each channel is connected to the secondary wire of the current transformer through an open-type current clamp, and is used to collect the current signal of the secondary circuit of the current transformer; A voltage sampling module, including at least 4 voltage terminals. Each voltage terminal is connected in parallel with the secondary circuit of the voltage transformer, and is used to collect the voltage signal of the secondary circuit of the voltage transformer; A temporary protection structure, which is respectively connected to the current sampling module and the voltage sampling module; The processing module in the temporary protection structure is used to execute a three-stage overcurrent protection logic judgment process according to the current signal and the voltage signal, judge whether the overcurrent protection condition is triggered, obtain a judgment result, and control the state of the circuit breaker according to the judgment result.

2. The band-aid type temporary protection device according to claim 1, wherein, The temporary protection structure further includes: a digital output module, connected to the processing module, including 1 alarm channel and at least 1 trip channel, and is used to output an alarm signal to the alarm device and output a trip command to the circuit breaker when the judgment result is yes, wherein the alarm signal and the trip command are signals generated by the processing module.

3. The band-aid type temporary protection device according to claim 1, characterized in that, The transient current measurement accuracy of the open-type current clamp meets the 5P or 10P standard.

4. The band-aid type temporary protection device according to claim 1, wherein The processing module also has functions of protection setting value setting, soft pressure plate input and output, and fault recording wave.

5. The band-aid type temporary protection device according to claim 4, characterized in that, The temporary protection structure further includes: a communication module, which is respectively connected to the processing module and the client, and is used to transmit the real-time acquisition data, the state data of the circuit breaker and the fault recording wave information to the client, wherein the real-time acquisition data includes the current signal and the voltage signal.

6. The band-aid type temporary protection device according to claim 1, wherein, The temporary protection structure further includes: a power supply module, connected to the processing module, including a storage battery and an AC220V power supply, and is used to provide power.

7. The band-aid type temporary protection device according to claim 1, characterized in that, The temporary protection structure further includes a housing, and the weight of the housing is less than 5 kg.

8. The band-aid type temporary protection device according to claim 7, wherein, The housing is connected to an external device in a magnetic adsorption or suspension manner.

9. The band-aid type temporary protection device according to claim 1, wherein Both the current sampling module and the voltage sampling module are detachable structures.

10. A method for using a band-aid type temporary protection device, characterized in that, The usage method of the band-aid type temporary protection device is implemented by using the band-aid type temporary protection device according to any one of claims 1-9. The usage method of the band-aid type temporary protection device includes: Non-invasively collect the current signal of the secondary circuit of the current transformer through an open-type current clamp; Non-invasively collect the voltage signal of the secondary circuit of the voltage transformer through a voltage terminal; The processing module executes a three-stage overcurrent protection logic judgment process according to the current signal and the voltage signal, judges whether the overcurrent protection condition is triggered, obtains a judgment result, and controls the state of the circuit breaker according to the judgment result.

Images