Bypass shunt protection device based on transformer area load detection

Abstract

A bypass shunt protection device based on transformer area load detection. The device comprises a first relay, a second relay, a first switch (K1), a second switch (K2), a third switch (K3), a current detection module (10) and a control module (20). The first relay comprises first knife switches (KM1) and a first coil (M1); the second relay comprises second knife switches (KM2) and a second coil (M2); the first switch (K1), the second switch (K2), the third switch (K3) and the current detection module (10) are all electrically connected to the control module (20); the current detection module (10) is configured to be arranged on a transformer area main busbar so as to detect the load current of the transformer area main busbar and send the load current to the control module (20); and the control module (20) is configured to acquire the load current of the transformer area main busbar, and control, when the load current of the transformer area main busbar satisfies a preset condition, the third switch (K3) to be closed so as to control the second knife switches (KM2) to be closed.

Description

Bypass shunt protection device based on load detection in substation area

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 21, 2023, with application number 202311775303.6. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of electric power technology, for example, to a bypass shunt protection device based on substation load detection, a control method thereof, and a switch assembly. Background Art

[0003] As the number of electrical appliances in users' homes increases and the power load increases, the low-capacity low-voltage switches of traditional stand-alone transformers can no longer meet demand, resulting in frequent tripping of the transformer's low-voltage switches, requiring frequent emergency repairs by power supply personnel. Replacing a large-capacity switch would require power outages, which is costly and unsuitable for practical needs. Once the power lines in the substation enter peak power consumption periods, the switches in the original substation lines will frequently trip, causing considerable trouble for residents' daily electricity use. Summary of the Invention

[0004] The present application provides a bypass shunt protection device based on substation load detection, a control method thereof, and a switch assembly to solve the frequent tripping failure of substation switches and save costs.

[0005] The present application provides a bypass shunt protection device based on substation load detection, comprising: a first relay, a second relay, a first switch, a second switch, a third switch, a current detection module, and a control module; the first relay comprises a first knife switch and a first coil; the second relay comprises a second knife switch and a second coil;

[0006] Wherein, the first knife switch is configured to be connected in series to the substation main bus, and the second knife switch is connected in parallel to the first knife switch; the first switch is configured to have a first end connected to the substation main bus, and a second end of the first switch is respectively connected to the first coil and the second coil; the second switch is configured to be respectively connected to the first coil and the substation main bus; the third switch is configured to be respectively connected to the second coil and the substation main bus;

[0007] The first switch, the second switch, the third switch and the current detection module are all electrically connected to the control module; the current detection module is configured to be arranged on the substation main bus to detect the load current of the substation main bus and send the load current to the control module; the control module is configured to obtain the load current of the substation main bus and, in response to the load current of the substation main bus meeting a preset condition, control the third switch to close to control the second knife switch to close.

[0008] Optionally, the preset condition is that the load current of the main bus of the substation is greater than a preset current.

[0009] Optionally, the first switch is an overcurrent protection switch.

[0010] Optionally, the second switch is an air switch.

[0011] Optionally, the current detection module is a current transformer.

[0012] Optionally, the bypass shunt protection device based on substation load detection further includes a fuse, which is configured to be connected to the substation main bus and the first end of the first switch respectively.

[0013] The present application also provides a switch assembly, which includes the above-mentioned bypass shunt protection device based on substation load detection.

[0014] Optionally, the switch assembly further includes a first resistor and a second resistor; wherein the first resistor is connected in series with the first knife switch, and the second resistor is connected in series with the second knife switch.

[0015] The present application also provides a control method for a bypass shunt protection device based on substation load detection, which is applied to a bypass shunt protection device based on substation load detection;

[0016] The method comprises:

[0017] The current detection module in the bypass shunt protection device based on the substation load detection obtains the load current of the main bus of the substation, and sends the load current to the control module in the bypass shunt protection device based on the substation load detection;

[0018] In response to the load current of the main bus of the substation satisfying a preset condition, the control module controls the third switch in the bypass shunt protection device based on substation load detection to close, so as to control the second knife switch in the second relay in the bypass shunt protection device based on substation load detection to close;

[0019] The bypass shunt protection device based on substation load detection includes: a first relay, a second relay, a first switch, a second switch, a third switch, the current detection module and the control module; the first relay includes a first knife switch and a first coil; the second relay includes the second knife switch and a second coil;

[0020] The first knife switch is connected in series to the substation main bus, and the second knife switch is connected in parallel to the first knife switch; the first end of the first switch is connected to the substation main bus, and the second end of the first switch is connected to the first coil and the second coil respectively; the second switch is connected to the first coil and the substation main bus respectively; the third switch is connected to the second coil and the substation main bus respectively;

[0021] The first switch, the second switch, the third switch and the current detection module are all electrically connected to the control module.

[0022] Optionally, the preset condition is that the load current of the main bus of the substation is greater than a preset current. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following is a brief introduction to the drawings required for describing the embodiments.

[0024] FIG1 is a schematic structural diagram of a bypass shunt protection device based on substation load detection provided in Example 1 of the present application;

[0025] FIG2 is a block diagram of the principle structure of a control signal of a bypass shunt protection device based on substation load detection provided in Example 1 of the present application;

[0026] FIG3 is a schematic structural diagram of a switch assembly provided in Example 2 of the present application;

[0027] FIG4 is a flow chart of a control method of a bypass shunt protection device based on substation load detection provided in Example 3 of the present application. DETAILED DESCRIPTION

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, in addition to the process, method, system, product or equipment comprising a series of steps or units shown in the embodiments of the present application, other processes, methods, systems, products or equipment of this series of steps or units not clearly listed may also be included, or other steps or units inherent to these processes, methods, systems, products or equipment.

[0029] Example 1

[0030] FIG1 is a structural diagram of a bypass shunt protection device based on substation load detection provided in Example 1 of the present application, and FIG2 is a principle structural block diagram of a control signal of a bypass shunt protection device based on substation load detection provided in Example 1 of the present application. Referring to FIG1 and FIG2, the bypass shunt protection device based on substation load detection, which may also be referred to as a substation switch expansion device, comprises: a first relay, a second relay, a first switch K1, a second switch K2, a third switch K3, a current detection module 10 and a control module 20; wherein, the first relay comprises a first knife switch KM1 and a first coil M1; the second relay comprises a second knife switch KM2 and a second coil M2; wherein, the first knife switch KM1 is connected in series to the substation main bus (such as the first phase L1, the second phase L2 and the third phase L3 of the three-phase line), and the second knife switch KM2 is connected in parallel to the first knife switch KM1; the first end of the first switch K1 is connected to the substation main bus (such as the second phase L2 in the three-phase line), and the second end of the first switch K1 is connected to the substation main bus (such as the second phase L2 in the three-phase line). They are respectively connected to the first coil M1 and the second coil M2; the second switch K2 is respectively connected to the first coil M1 and the substation main bus (such as the third phase L3 in the three-wire phase); the third switch K3 is respectively connected to the second coil M2 and the substation main bus (such as the third phase L3 in the three-wire phase); the first switch K1, the second switch K2, the third switch K3 and the current detection module 10 are all electrically connected to the control module 20; the current detection module 10 is set on the substation main bus, and is configured to detect the load current of the substation main bus and send the load current to the control module 20; the control module 20 is configured to obtain the load current of the substation main bus, and control the third switch K3 to close when the load current of the substation main bus meets the preset conditions, so as to control the second knife switch KM2 to close.

[0031] Optionally, the control module may be a control chip such as a single chip microcomputer.

[0032] Exemplarily, the first relay includes a first knife switch KM1 and a first coil M1. When the first coil M1 is energized, the first knife switch KM1 is closed. Therefore, under normal circumstances, the control module 20 controls the first switch K1 and the second switch K2 to be closed. Due to the closure of the first switch K1 and the second switch K2, the first switch K1, the second switch K2, the first coil M1, the second phase L2 of the substation main bus, and the third phase L3 of the substation main bus form a closed loop, so that the first coil M1 is energized. The energization of the first coil M1 causes the first knife switch KM1 to be closed, so that the substation main bus operates normally.

[0033] Similarly, the second relay includes a second knife switch KM2 and a second coil M2. When the second coil M2 is energized, the second knife switch KM2 will be closed. When the control module 20 controls the third switch K3 to be closed, due to the closure of the third switch K3, the first switch K1, the second coil M2, the third switch K3, the second phase L2 of the substation main bus and the third phase L3 of the substation main bus form a closed loop, so that the second coil M2 is energized. The energization of the second coil M2 causes the second knife switch KM2 to be closed. At this time, the second knife switch K2 acts as a bypass switch to share the load pressure with the first knife switch on the substation main bus, thereby avoiding the problem of the main road tripping due to excessive load pressure.

[0034] The first knife switch KM1 is used as the main switch of the main busbar of the substation, and the second knife switch KM2 is used as the bypass switch to jump to the main busbar.

[0035] By setting a current detection module 10 on the main bus of the substation, the load current of the main bus of the substation can be detected in real time and the load current can be sent to the control module 20. The control module 20 determines whether the load current meets the preset conditions based on the load current of the main bus of the substation. If it meets the conditions, it means that the load of the main bus of the substation is relatively large and needs to be shared. At this time, the control module 20 will control the third switch K3 to close. The third switch K3 is closed, so that the second coil M2 is energized. The second coil M2 is energized, so that the second knife switch KM2 is closed. At this time, the second knife switch acts as a bypass switch and shares the load pressure with the first knife switch on the main road, avoiding the problem of the main road tripping due to excessive load pressure. Therefore, it can be installed without power outage, which can solve the problem of frequent switch tripping. If the load current of the main bus of the substation does not meet the preset conditions, it means that the load of the main bus of the substation is not too large at this time, and the first knife switch on the main bus of the substation can bear the existing load. At this time, there is no need to control the opening of the bypass switch.

[0036] In the technical solution of this embodiment, the implementation process of the bypass shunt protection device based on substation load detection is as follows: Referring to Figures 1 and 2, under normal circumstances, the control module 20 will control the first switch K1 and the second switch K2 to be closed. Due to the closure of the first switch K1 and the second switch K2, the first switch K1, the second switch K2, the first coil M1, the second phase L2 of the substation main bus and the third phase L3 of the substation main bus form a closed loop, so that the first coil M1 is energized. The energization of the first coil M1 causes the first knife switch KM1 to be closed, so that the substation main bus operates normally. The current detection module 10 detects the load current of the substation main bus in real time and sends the load current to the control module 20. After receiving the load current of the substation main bus, the control module 20 determines whether it meets the preset conditions based on the load current of the substation main bus. If it meets the preset conditions, it means that the load of the substation main bus is relatively large and needs to be shared. At this time, the control module 20 will control the third switch K3 to close. The closure of the third switch K3 energizes the second coil M2. The energization of the second coil M2 causes the second knife switch KM2 to close, so as to divert part of the main current from the bypass switch, i.e., the second knife switch, thereby reducing the load pressure of the main switch, i.e., the first knife switch, so that the second knife switch can share the load pressure with the first knife switch on the main road as a bypass switch, thereby protecting the original switch from being burned due to excessive load, reducing the emergency repair work pressure of the distribution network power supply personnel, and saving the cost of replacing equipment. If the load current of the substation main bus does not meet the preset conditions, it means that the load of the substation main bus is not too large at this time, and the first knife switch on the substation main bus can bear the existing load. At this time, there is no need to control the opening of the bypass switch. This can realize automatic monitoring of the load current on the main bus of the substation and automatic control of the bypass switch, preventing frequent tripping faults. Therefore, it can be installed without power outages, which can solve the problem of frequent switch tripping faults and save costs at the same time.

[0037] The technical solution of this embodiment provides a bypass shunt protection device based on substation load detection, including: a first relay, a second relay, a first switch, a second switch, a third switch, a current detection module and a control module; wherein the first relay includes a first knife switch and a first coil; the second relay includes a second knife switch and a second coil; wherein the first knife switch is connected in series to the substation main bus, and the second knife switch is connected in parallel to the first knife switch; the first end of the first switch is connected to the substation main bus, and the second end of the first switch is connected to the first coil and the second coil respectively; the second switch is connected to the first coil and the substation main bus respectively; the third switch is connected to the second coil and the substation main bus respectively; the first switch, the second switch, the third switch and the current detection module are all electrically connected to the control module; the current detection module is arranged on the substation main bus, and is arranged to detect the load current of the substation main bus and send the load current to the control module; the control module is arranged to obtain the load current of the substation main bus, and control the third switch to close when the load current of the substation main bus meets the preset conditions, so as to control the second knife switch to close. It can be seen from this that by setting the first relay, the second relay, the first switch, the second switch, the third switch, the current detection module and the control module, and setting the current detection module to detect in real time whether the load current of the main bus of the substation meets the preset conditions, and controlling the third switch to close when the preset conditions are met, so as to control the second knife switch to close, so that the second knife switch can be used as a bypass switch to share the load pressure with the first knife switch on the main road, avoiding the problem of the main road tripping due to excessive load pressure, so that it can be installed without power outage, which can solve the problem of frequent switch tripping and reduce costs.

[0038] On the basis of the above-mentioned technical implementation scheme, optionally, the preset condition is: the load current of the main bus of the substation is greater than the preset current.

[0039] The magnitude of the preset current is related to the maximum load that the first knife switch can withstand. The value of the preset current can be set according to actual conditions and is not specifically limited here.

[0040] Optionally, the first switch is an overcurrent protection switch.

[0041] The first switch is used as a protection switch and is configured to provide overcurrent and short-circuit protection for the entire circuit.

[0042] Optionally, the second switch is an air switch.

[0043] Exemplarily, the second switch is an air switch. When the air switch is pressed, the first switch K1 and the second switch K2 are closed, so that the first switch K1, the second switch K2, the first coil M1, the second phase L2 of the substation main bus and the third phase L3 of the substation main bus form a closed loop, so that the first coil M1 is energized. The energization of the first coil M1 closes the first knife switch KM1, so that the substation main bus works normally.

[0044] Optionally, the current detection module is a current transformer.

[0045] For example, the current detection module can be installed on any phase of the three-phase line of the substation main bus, such as the first phase L1. There can be multiple current detection modules, and multiple current detection modules can be configured to verify each other to ensure the accuracy of data detection and judgment. For example, two current detection modules can be installed, one on the first phase and the other on the third phase of the substation main bus. The number and location of the modules can be set according to actual conditions and are not specifically limited here.

[0046] Optionally, continuing to refer to FIG1 , the bypass shunt protection device based on substation load detection further includes a fuse FR0 , which is connected to the substation main bus and the first end of the first switch K1 , respectively.

[0047] 1 , the fuse FR0 is connected to the second phase L2 of the substation main bus and the first end of the first switch K1 respectively, and the fuse FR0 is configured to protect the circuit.

[0048] 1 , fuses FR1 , FR2 and FR3 are respectively provided on the first phase L1 , second phase L2 and third phase L3 of the main busbar of the substation, and the fuses FR1 , FR2 and FR3 are provided to protect the main busbar.

[0049] In addition, referring to FIG1 , a main switch Qs is also provided on the main bus of the substation area, which is configured to control the access power supply of the main bus of the substation area, such as AC 380V power supply.

[0050] Example 2

[0051] FIG3 is a schematic diagram of the structure of a switch assembly provided in Example 2 of the present application. This embodiment of the present application also provides a switch assembly. Referring to FIG3 , the switch assembly includes a bypass shunt protection device based on substation load detection provided in any embodiment of the present application.

[0052] Referring to Figure 3, the first and second knife switches shown in Figure 1 are simplified into the switch assembly shown in Figure 3, namely the main switch 103 and bypass switch 104. These are then connected in parallel to the distribution box. During installation and wiring, one end of the parallel connection between the main switch 103 and bypass switch 104 is electrically connected to the positive bus 101 of the distribution box, and the other end of the parallel connection between the main switch 103 and bypass switch 104 is electrically connected to the negative bus 102 of the distribution box. This simplifies installation, achieves embedded switching, and saves space.

[0053] Optionally, with continued reference to FIG3 , the switch assembly further includes a first resistor R1 and a second resistor R2 ; wherein the first resistor R1 is connected in series with the first knife switch, and the second resistor R2 is connected in series with the second knife switch.

[0054] The first resistor R1 is connected in series with the main switch 103 (ie, the first knife switch), and the second resistor R2 is connected in series with the bypass switch 104 (ie, the second knife switch).

[0055] The first resistor R1 and the second resistor R2 are configured to limit current and protect the circuit.

[0056] Optionally, referring to Figure 3 , the switch assembly further includes a capacitor C1. A first end of capacitor C1 is electrically connected to the positive busbar, and a second end of capacitor C1 is electrically connected to the main switch 103 and the bypass switch 104, respectively. Capacitor C1 is configured as a compensation capacitor to prevent excessive line inductance and compensate for current protection.

[0057] Example 3

[0058] FIG4 is a flow chart of a control method for a bypass shunt protection device based on load detection in a substation provided in Example 3 of the present application. As shown in FIG4 , the method includes the following steps:

[0059] S110. The current detection module in the bypass shunt protection device based on substation load detection obtains the load current of the main bus of the substation, and sends the load current to the control module in the bypass shunt protection device based on substation load detection.

[0060] S120. In response to the load current of the main bus of the substation meeting the preset conditions, the control module controls the third switch in the bypass shunt protection device based on substation load detection to close, so as to control the second knife switch in the second relay in the bypass shunt protection device based on substation load detection to close.

[0061] Exemplarily, a bypass shunt protection device based on substation load detection includes: a first relay, a second relay, a first switch, a second switch, a third switch, a current detection module and a control module; wherein the first relay includes a first knife switch and a first coil; the second relay includes a second knife switch and a second coil; wherein the first knife switch is connected in series to the substation main bus, and the second knife switch is connected in parallel to the first knife switch; the first end of the first switch is connected to the substation main bus, and the second end of the first switch is connected to the first coil and the second coil respectively; the second switch is connected to the first coil and the substation main bus respectively; the third switch is connected to the second coil and the substation main bus respectively; the first switch, the second switch, the third switch and the current detection module are all electrically connected to the control module; the current detection module is set on the substation main bus, and is set to detect the load current of the substation main bus and send the load current to the control module; the control module is set to obtain the load current of the substation main bus, and control the third switch to close when the load current of the substation main bus meets the preset conditions, so as to control the second knife switch to close. Among them, the load current of the main bus of the substation area can be detected and obtained through the current detection module.

[0062] The technical solution of this embodiment provides a control method for a bypass shunt protection device based on substation load detection, including: a current detection module in the bypass shunt protection device based on substation load detection obtains the load current of the main bus of the substation where it is located, and sends the load current to a control module in the bypass shunt protection device based on substation load detection; the control module controls the third switch in the bypass shunt protection device based on substation load detection to close in response to the load current of the main bus of the substation meeting a preset condition, so as to control the second knife switch in the second relay in the bypass shunt protection device based on substation load detection to close. By setting a first relay, a second relay, a first switch, a second switch, a third switch, a current detection module and a control module, and setting the current detection module to detect in real time whether the load current of the main bus of the substation meets the preset conditions, and controlling the third switch to close when the preset conditions are met, so as to control the closure of the second knife switch, so that the second knife switch is used as a bypass switch to share the load pressure with the first knife switch on the main road, avoiding the problem of the main road tripping due to excessive load pressure, so that it can be installed without power outage, which can solve the problem of frequent switch tripping and reduce costs.

[0063] Optionally, the preset condition is: the load current of the main bus of the substation is greater than a preset current.

[0064] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the multiple steps described in this application can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this application can be achieved. This is not limited herein.

Claims

1. A bypass shunt protection device based on load detection in a transformer area, comprising: A first relay, a second relay, a first switch, a second switch, a third switch, a current detection module and a control module; The first relay includes a first knife switch and a first coil; the second relay includes a second knife switch and a second coil; Wherein, the first knife switch is configured to be connected in series to the main bus of the substation, and the second knife switch is connected in parallel to the first knife switch; the first switch is configured to have a first end connected to the main bus of the substation, and a second end of the first switch is respectively connected to the first coil and the second coil; the second switch is configured to be respectively connected to the first coil and the main bus of the substation; the third switch is configured to be respectively connected to the second coil and the main bus of the substation; The first switch, the second switch, the third switch and the current detection module are all electrically connected to the control module; the current detection module is arranged on the main bus of the substation area to detect the load current of the main bus of the substation area and send the load current to the control module; The control module is configured to obtain the load current of the main bus of the substation area, and in response to the load current of the main bus of the substation area meeting a preset condition, control the third switch to close, so as to control the second knife switch to close.

2. The bypass shunt protection device based on area load detection according to claim 1, wherein: The preset condition is that the load current of the main bus of the substation is greater than the preset current.

3. The bypass shunt protection device based on area load detection according to claim 1, wherein: The first switch is an overcurrent protection switch.

4. The bypass current shunting protection device based on area load detection according to claim 1, wherein: The second switch is an air switch.

5. The bypass current shunting protection device based on area load detection according to claim 1, wherein: The current detection module is a current transformer.

6. The bypass shunt protection device based on substation load detection according to claim 1 further includes a fuse, which is configured to be connected to the substation main bus and the first end of the first switch respectively.

7. A switch assembly, comprising a bypass shunt protection device based on substation load detection as described in any one of claims 1 to 6.

8. The switch assembly according to claim 7, further comprising a first resistor and a second resistor; wherein The first resistor is connected in series with the first knife switch, and the second resistor is connected in series with the second knife switch.

9. A control method for a bypass shunt protection device based on area load detection, applied to a bypass shunt protection device based on area load detection; The method comprises: The current detection module in the bypass shunt protection device based on the substation load detection obtains the load current of the main bus of the substation, and sends the load current to the control module in the bypass shunt protection device based on the substation load detection; The control module controls the third switch in the bypass shunt protection device based on the substation load detection to close in response to the load current of the main bus of the substation area meeting the preset condition, so as to control the second knife switch in the second relay in the bypass shunt protection device based on the substation load detection to close; Wherein, the bypass shunt protection device based on area load detection includes: a first relay, a second relay, a first switch, a second switch, a third switch, the current detection module and the control module; the first relay includes a first knife switch and a first coil; the second relay includes the second knife switch and a second coil; The first knife switch is connected in series to the main bus of the substation, and the second knife switch is connected in parallel with the first knife switch; the first end of the first switch is connected to the main bus of the substation, and the second end of the first switch is connected to the first coil and the second coil respectively; the second switch is connected to the first coil and the main bus of the substation respectively; the third switch is connected to the second coil and the main bus of the substation respectively; The first switch, the second switch, the third switch and the current detection module are all electrically connected to the control module.

10. The control method of the bypass shunt protection device based on the load detection of the substation according to claim 9, wherein: The preset condition is that the load current of the main bus of the substation is greater than the preset current.

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