Detection device of feeder automation terminal

Abstract

The utility model discloses a detection device of a feeder automation terminal, and relates to the technical field of feeder automation terminals. The detection device of the feeder line automation terminal comprises an input interface, a voltage identification conversion loop, a closing time relay, an opening time relay, an opening and closing loop, an energy storage loop, a grounding knife loop, an isolation knife loop, a detection loop, a switching loop and a conversion loop, and the input interface is used for receiving an input signal; the voltage identification conversion loop is connected with the input interface; the closing time relay and the opening time relay are connected with the voltage identification conversion loop; and the opening and closing loop is respectively connected with the closing time relay and the opening time relay. The detection device of the feeder automation terminal according to the embodiment of the utility model can be compatible with various operation voltage grades, and can meet the requirements of electromagnetic and electronic tests.

Description

Technical Field

[0001] The utility model relates to the technical field of feeder automation terminals, in particular to a detection device for feeder automation terminals. Background Art

[0002] At present, the detection devices of 10KV feeder automation terminals are divided into electromagnetic, electronic, permanent magnet and other types due to different standard requirements. The requirements for opening and closing voltage levels and opening and closing times of different types of products are not the same. Testing these products often requires the design of different test devices.

[0003] Since different types of products require different test devices, the following three problems arise:

[0004] 1. When the production system switches product categories, the test equipment must also be replaced accordingly, affecting test efficiency;

[0005] 2. Different test devices are placed, which takes up space and costs;

[0006] 3. When replacing the test device, there is a risk of wiring errors. Utility Model Content

[0007] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention proposes a detection device for a feeder automation terminal that is compatible with feeder automation terminals of different voltage levels without the need to replace the test device.

[0008] According to an embodiment of the present invention, a detection device for a feeder automation terminal includes:

[0009] Input interface, used for receiving input signals;

[0010] A voltage identification conversion circuit, connected to the input interface, for identifying the voltage level of the input signal and converting the input signal into a 24V control signal;

[0011] A closing time relay, connected to the voltage identification conversion circuit, for setting the closing time;

[0012] A trip time relay, connected to the voltage identification conversion circuit, for setting the trip time;

[0013] An opening and closing circuit, connected to the closing time relay and the opening time relay respectively, for driving the circuit breaker to open or close;

[0014] An energy storage circuit, used for storing energy for the circuit switch;

[0015] Grounding switch circuit, used to control the opening and closing status of the grounding switch;

[0016] Isolating knife circuit, used to control the opening and closing status of the isolating switch;

[0017] A detection circuit, used to detect the energy storage state of the circuit breaker, the opening and closing states of the grounding switch, and the opening and closing states of the isolating switch;

[0018] Switching circuit, used to switch the detection circuits of the power supply side voltage, load side voltage and current of the feeder automation terminal;

[0019] A conversion circuit, when the feeder automation terminal is an electronic feeder automation terminal, the switching circuit is connected to the conversion circuit, and is connected to the detection circuit of the electronic feeder automation terminal through the conversion circuit; when the feeder automation terminal is an electromagnetic feeder automation terminal, the switching circuit is connected to the electromagnetic feeder automation terminal.

[0020] According to some embodiments of the present invention, the detection device further includes a refusal circuit, and when the refusal circuit receives a refusal signal, the opening and closing circuit cannot perform an opening action.

[0021] According to some embodiments of the present invention, the detection device further includes a reset circuit, and the reset circuit is used to reset the detection device.

[0022] According to some embodiments of the present invention, the detection device further includes a local-remote switching circuit, and the local-remote switching circuit is used to switch the detection device between a local state and a remote state.

[0023] According to some embodiments of the present invention, the detection device also includes a switch circuit, which includes at least one of a power switch, a remote local switch, a switching switch, a closing switch, an opening switch, a knife-isolating closing switch, a knife-isolating opening switch, a ground knife closing switch, a ground knife opening switch, a reset switch and an energy storage switch.

[0024] According to some embodiments of the present utility model, the detection device also includes a power-on buffer circuit and a power conversion circuit, the power conversion circuit is connected to the power-on buffer circuit, the power-on buffer circuit is used to buffer the power-on power supply, and the power conversion circuit is used to convert the 24V power-on power supply into a 12V power supply and power the conversion circuit.

[0025] According to some embodiments of the present invention, the voltage identification and conversion circuit includes an identification unit, an operational amplifier unit, an indication unit and a conversion unit. The identification unit is used to identify the voltage level of the input signal, the operational amplifier unit is used to amplify the identification signal of the identification unit, the indication unit is used to display the corresponding voltage level according to the amplified identification signal, and the conversion unit is used to convert the input signal into a 24V control signal.

[0026] According to some embodiments of the present invention, the indicating unit includes a plurality of indicator lights, each of which corresponds to a different voltage level.

[0027] The detection device of the feeder automation terminal according to the embodiment of the utility model has at least the following beneficial effects: by setting a voltage identification conversion circuit, the detection device automatically identifies, indicates and converts the operating voltage level, so that it can be compatible with passive / 24V / 48V / 380V and other operating voltage levels; the detection device includes an earth knife circuit and an isolation knife circuit, and has hardware-level anti-false operation logic; the opening, closing and energy storage time of the detection device can be manually set; the detection device can output switch closing / opening signals, no energy storage signals, closing / opening control signals, earth knife closing / opening signals, isolation knife closing / opening signals, and remote / local signals; the detection device can meet the requirements of both electromagnetic and electronic tests.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] Figure 1 This is a circuit diagram of the input interface of an embodiment of the present utility model;

[0031] Figure 2 This is a circuit diagram of a voltage identification conversion circuit according to an embodiment of the present utility model;

[0032] Figure 3 This is a circuit diagram of a closing time relay and an opening time relay according to an embodiment of the present utility model;

[0033] Figure 4 This is a circuit diagram of the opening and closing circuit of an embodiment of the utility model;

[0034] Figure 5 This is a circuit diagram of a knife isolation circuit according to an embodiment of the present invention;

[0035] Figure 6 This is a circuit diagram of a ground knife circuit according to an embodiment of the present invention;

[0036] Figure 7 A circuit diagram of an energy storage circuit according to an embodiment of the present invention;

[0037] Figure 8 A circuit diagram of a mode selection circuit according to an embodiment of the present invention;

[0038] Figure 9 A circuit diagram of a switching circuit according to an embodiment of the present invention;

[0039] Figure 10 This is a circuit diagram of a voltage-to-voltage circuit according to an embodiment of the present invention;

[0040] Figure 11 This is a circuit diagram of a current-to-voltage circuit according to an embodiment of the present invention;

[0041] Figure 12 This is a circuit diagram of a rejection circuit according to an embodiment of the present invention;

[0042] Figure 13 This is a circuit diagram of a reset circuit according to an embodiment of the present invention;

[0043] Figure 14 This is a circuit diagram of a local remote switching circuit according to an embodiment of the present invention;

[0044] Figure 15 Schematic diagram of a feedback circuit according to an embodiment of the present invention;

[0045] Figure 16 A circuit diagram of a switch circuit according to an embodiment of the present invention;

[0046] Figure 17 This is a circuit diagram of a power-on buffer circuit according to an embodiment of the present invention;

[0047] Figure 18 A circuit diagram of a power conversion circuit according to an embodiment of the present invention;

[0048] Figure 19 A schematic diagram of the opening and closing process of an embodiment of the utility model;

[0049] Figure 20 This is a schematic diagram of the working process of the switching circuit and the detection circuit in an embodiment of the present utility model. DETAILED DESCRIPTION

[0050] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. For the step numbers in the following embodiments, they are only provided for the convenience of explanation and are not intended to limit the order of the steps. The order of execution of the steps in the embodiments can be adaptively adjusted according to the understanding of those skilled in the art.

[0051] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0052] The terms "first," "second," "third," and "fourth," etc., in the specification, claims, and accompanying drawings of the present invention are used to distinguish between different items, not to describe a specific order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements, but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0053] References to "embodiments" in this disclosure mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0054] At present, the detection devices of 10KV feeder automation terminals are divided into electromagnetic, electronic, permanent magnet and other types due to different standard requirements. The requirements for opening and closing voltage levels and opening and closing times of different types of products are not the same. Testing these products often requires the design of different test devices.

[0055] Since different types of products require different test devices, the following three problems arise:

[0056] 1. When the production system switches product categories, the test equipment must also be replaced accordingly, affecting test efficiency;

[0057] 2. Different test devices are placed, which takes up space and costs;

[0058] 3. When replacing the test device, there is a risk of wiring errors.

[0059] To this end, an embodiment of the utility model provides a detection device for a feeder automation terminal. By setting a voltage identification and conversion circuit, the detection device automatically identifies, indicates and converts the operating voltage level, so that it can be compatible with passive / 24V / 48V / 380V and other operating voltage levels; the detection device includes a ground knife circuit and an isolation knife circuit, and has hardware-level anti-false operation logic; the opening, closing and energy storage time of the detection device can be manually set; the detection device can output switch closing / opening signals, no energy storage signals, closing / opening control signals, ground knife closing / opening signals, isolation knife closing / opening signals, and remote / local signals; the detection device can meet both electromagnetic and electronic testing requirements.

[0060] The following describes in detail the detection device of the feeder automation terminal according to the embodiment of the present utility model with reference to the accompanying drawings.

[0061] The embodiment of the present utility model proposes a detection device for a feeder automation terminal, comprising: an input interface 100, a voltage identification conversion circuit 200, a closing time relay 300, an opening time relay 400, a closing and opening circuit 500, an energy storage circuit 800, a ground knife circuit 700, an isolation knife circuit 600, a detection circuit (not shown), a switching circuit 900 and a conversion circuit, wherein the input interface 100 is used to receive an input signal; the voltage identification conversion circuit 200 is connected to the input interface 100, and is used to identify the voltage level of the input signal and convert the input signal into a 24V control signal; the closing time relay 300 is connected to the voltage identification conversion circuit 200, and is used to set the closing time; the opening time relay 400 is connected to the voltage identification conversion circuit 200, and is used to set the opening time; the closing and opening circuits 500 are respectively connected to the closing circuit 100 and the voltage identification conversion circuit 200. The time relay 300 is connected to the opening time relay 400 and is used to drive the line switch to open or close; the energy storage circuit 800 is used to store energy for the line switch; the earth knife circuit 700 is used to control the opening and closing status of the earthing switch; the isolation knife circuit 600 is used to control the opening and closing status of the isolation switch; the detection circuit is used to detect the energy storage status of the line switch, the opening and closing status of the earthing switch, and the opening and closing status of the isolation switch; the switching circuit 900 is used to switch the detection circuits of the power side voltage, load side voltage and current of the feeder automation terminal; when the feeder automation terminal is an electronic feeder automation terminal, the switching circuit 900 is connected to the conversion circuit and is connected to the detection circuit of the electronic feeder automation terminal through the conversion circuit; when the feeder automation terminal is an electromagnetic feeder automation terminal, the switching circuit 900 is connected to the electromagnetic feeder automation terminal.

[0062] Specifically, if Figure 1 As shown, in this example, the input interface 100 can receive signals of multiple different voltage levels, such as 48V, 24V, 380V (i.e., coil voltage XQ) and passive voltage (WY). For 10kV feeder automation terminals, due to different standard requirements, they are divided into electromagnetic, electronic, permanent magnet and other types. The requirements for opening and closing voltage levels and opening and closing time of different types of products are not the same. When testing these products, in order to avoid designing different test devices, the detection device of the present application can be compatible with opening signals (FZ) and closing signals (HZ) of multiple different voltage levels, such as compatible with passive / 24V / 48V / 380V and other operating voltage levels.

[0063] When the input interface 100 receives the input signal, it inputs the input signal to the voltage identification conversion circuit 200, which identifies the voltage level of the input signal and converts the input signals of different voltage levels into 24V control signals, so that the detection device can be compatible with a variety of opening and closing signals of different voltage levels. Figure 2 As shown, in this example, the voltage identification conversion circuit 200 includes an identification unit 210, an operational amplifier unit 220, an indication unit 230 and a conversion unit 240. The identification unit 210 is used to identify the voltage level of the input signal, the operational amplifier unit 220 is used to amplify the identification signal of the identification unit 210, the indication unit 230 is used to display the corresponding voltage level according to the amplified identification signal, and the conversion unit 24 is used to convert the input signal into a 24V control signal.

[0064] Specifically, after receiving an input signal, the input interface 100 sends it to the identification unit 210 and the conversion unit 240. The conversion unit 240 converts the input signal into a 24V control signal, thereby controlling the opening and closing of the circuit breaker. The identification unit 210 identifies the input signal, identifies the voltage level corresponding to the input signal, and sends the identification signal to the operational amplifier unit 220. The operational amplifier unit 220 includes multiple interlocked operational amplifiers, each corresponding to a different voltage level. Upon receiving the identification signal from the identification unit 210, the operational amplifier corresponding to the voltage level of the identification signal amplifies the identification signal and sends the amplified identification signal to the indication unit 230. In this example, the indication unit 230 includes a plurality of indicator lights, each of which corresponds to a different voltage level. For example, when the indicator light DS1 is on, the voltage level at this time is 380V; when the indicator light DS2 is on, the voltage level at this time is 48V; when the indicator light DS3 is on, the voltage level at this time is 24V; when the indicator light DS4 is on, the voltage level at this time is passive voltage; when the indicator light DS5 is on, the detection device is in an energy storage state; when the indicator light DS6 is on, the detection device is in an on-site state. The on-site state indicates that the working state of the detection device is controlled locally / on-site, and the remote state indicates that the working state of the detection device is remotely controlled. The detection device can only be in one of the on-site state or the remote state to prevent safety accidents caused by simultaneous on-site and remote operations. By providing the indication unit 230, the user can intuitively understand the status of the detection device.

[0065] like Figure 3 and Figure 4 As shown, after the voltage identification conversion circuit 200 converts the input signal into a 24V control signal, the control signal is sent to the closing time relay 300 or the opening time relay 400. If the control signal is a closing signal, it is sent to the closing time relay 300. The closing time relay 300 can set the corresponding closing time according to different closing time requirements, so that the scoring closing circuit 500 performs the closing action; if the control signal is an opening signal, it is sent to the opening time relay 400. The opening time relay 400 can set the corresponding opening time according to different opening time requirements, so that the scoring closing circuit 500 performs the opening action.

[0066] It should be noted that, when closing the circuit breaker, three conditions need to be met at the same time before closing the circuit breaker, and these three conditions are: the energy storage state is stored, the earth knife (grounding switch) position is in the open position, and the isolating knife (isolating switch) position is in the closed position; when opening the circuit breaker, three conditions need to be met at the same time before opening the circuit breaker, and these three conditions are: there is no refusal signal, the earth knife position is in the open position, and the isolating knife position is in the closed position. Therefore, the detection device of the present application also includes an energy storage circuit 800, an earth knife circuit 700, an isolating knife circuit 600 and a refusal circuit 1100; wherein, the isolating knife circuit 600 is as follows Figure 5 As shown, GDF represents the knife-isolating opening signal, GDH represents the knife-isolating closing signal, and the knife-isolating circuit 600 is used to control the knife-isolating position to be in the open position or the closed position; the ground knife circuit 700 is as shown Figure 6 As shown in FIG, DDF represents the ground switch opening signal, DDH represents the ground switch closing signal, and the ground switch circuit 700 is used to control the ground switch position to be in the opening position or the closing position. Figure 7 As shown, it is used to control the circuit breaker to store energy. Only when the circuit breaker stores energy, there is energy to open the circuit breaker. Figure 12 As shown, when the refusal circuit 1100 receives the refusal signal, it can control the detection device to open and refusal, and only when the refusal is released can the detection device continue to open. Figure 19 As shown:

[0067] When closing: The 10kV feeder automation terminal (including various opening and closing voltage levels) outputs a closing signal to the detection circuit of the detection device. When the detection circuit finds that the device meets three conditions at the same time (energy storage state has been stored, the earth switch position is in the open position, and the isolation switch position is in the closed position), the closing time relay 300 is used to start the closing timer. After the timer ends, the closing status is output. If the three conditions cannot be met at the same time, the closing is rejected.

[0068] When opening: the 10kV feeder automation terminal (including various opening and closing voltage levels) outputs the opening signal to the detection circuit of the detection device. When the three conditions are met at the same time (no refusal signal, the earth switch position is in the open position, and the isolation switch position is in the closed position), the opening timing is started through the opening time relay 400. After the timing is over, the opening state is output, and energy storage is started at the same time. After the timing is over, the time relay of the energy storage circuit 800 outputs the energy storage signal. If the three conditions cannot be met at the same time, the opening is rejected.

[0069] Circuit indication: 10kV feeder automation terminal (including various closing and opening voltage levels) outputs closing and opening signals to the voltage identification conversion circuit 200 of the detection device, identifies the corresponding voltage level, and then indicates the identified signal with an indicator light.

[0070] Among them, the closing state and the opening state are both Figure 15 The feedback circuit shown feeds back to the terminals, where HWCD represents the closed contact and FWCD represents the open contact.

[0071] like Figure 20 As shown, when testing the feeder automation terminal, the test instrument outputs analog quantity (current / voltage) and then loads it into the switching circuit 900 of the detection device; if the 10kV feeder automation terminal (FTU) is of electromagnetic type (rated current 5A, rated voltage 100V), the analog quantity is directly loaded into the detection circuit of the feeder automation terminal under test after passing through the switching circuit 900; if the 10kV feeder automation terminal is of electronic type (rated current 5A to 5V, rated voltage 100V to 1.876V), the analog quantity is loaded into the conversion circuit of the detection device (such as Figure 10 The voltage-to-voltage circuit 1001 and Figure 11 The current-to-voltage circuit 1002 shown in the figure, whose main circuit consists of an operational amplifier and a mutual inductor, then outputs the corresponding analog value to the detection circuit of the feeder automation terminal under test. The switching circuit 900 is used to switch the detection circuits of the power supply side voltage (A side voltage PT mode), load side voltage (B side voltage PT mode) and current (CT mode) of the feeder automation terminal. Figure 8 As shown, the detection device of this example has a mode selection circuit, which can manually switch between the A-side voltage PT mode, the B-side voltage PT mode and the CT mode, thereby adapting to a variety of different test items.

[0072] like Figure 13 As shown, in some embodiments of the present invention, the detection device further includes a reset circuit 1200, which is used to reset the detection device. The reset circuit 1200 can reset the closing, opening, energy storage time, and refusal to operate command, thereby enabling the detection device to resume normal operation when an abnormality occurs.

[0073] like Figure 14 As shown, in some embodiments of the present invention, the detection device further includes a local / remote switching circuit 1300, which is used to switch the detection device between a local state and a remote state. The local state indicates that the detection device's operating state is controlled locally / on-site, while the remote state indicates that the detection device's operating state is remotely controlled. The detection device can only be in one of the local and remote states, preventing safety accidents caused by simultaneous local and remote operation.

[0074] like Figure 16As shown, in some embodiments of the present invention, the detection device also includes a switch circuit 1400, and the switch circuit 1400 includes at least one of a power switch (S1), a remote local switch (S11), a transfer switch (S5, S6, S7), a closing switch (S2), an opening switch (S8), a knife-isolating closing switch (S4), a knife-isolating opening switch (S10), a ground knife closing switch (S3), a ground knife opening switch (S9), a reset switch (S13) and an energy storage switch (S12). Among them, the power switch (S1) is used to control the power on and off of the detection device, the remote local switch (S11) is used to switch the detection device between the remote state and the local state, the switching switches (S5, S6, S7) are used to switch the A-side voltage PT mode, the B-side voltage PT mode and the CT mode, the closing switch (S2) is used to control the line switch (circuit breaker) to close, the opening switch (S8) is used to control the line switch (circuit breaker) to open, the knife closing switch (S4) is used to control the isolating switch to close, the knife opening switch (S10) is used to control the isolating switch to open, the ground knife closing switch (S3) is used to control the grounding switch to close, the ground knife opening switch (S9) is used to control the grounding switch to open, the reset switch (S13) is used to control the detection device to reset, and the energy storage switch (S12) is used to control the detection device to store energy.

[0075] like Figure 17 and Figure 18 As shown, the detection device also includes a power-on buffer circuit 1500 and a power conversion circuit 1600. Power conversion circuit 1600 is connected to power-on buffer circuit 1500. Power-on buffer circuit 1500 is used to buffer the power supply when the power is on. Power conversion circuit 1600 is used to convert the 24V power supply to 12V and power the conversion circuit. Power-on buffer circuit 1500 can prevent damage to the device caused by excessive voltage changes.

[0076] The detection device according to the embodiment of the present utility model has the following characteristics:

[0077] 1. The opening and closing circuits of the detection device are compatible with operating voltage levels such as passive / 24V / 48V / 380V;

[0078] 2. The detection device is equipped with a voltage identification and conversion circuit 200 to automatically identify, indicate and convert the operating voltage level;

[0079] 3. The detection device includes a ground knife circuit 700 and a spacer knife circuit 600, and has hardware-level anti-malfunction logic;

[0080] 4. The detection device has manual and external control interfaces, which can be used for manual and remote control operation.

[0081] 5. The opening, closing and energy storage time of the detection device can be set manually;

[0082] 6. The detection device can output switch closing / opening signal, no energy storage signal, closing / opening gate control output signal, ground switch closing / opening signal, isolation switch closing / opening signal, and remote / local signal;

[0083] 7. The detection device has a refusal circuit 1100. When receiving a refusal signal, the device can open and refuse to operate. After the refusal is released, the device can continue to open.

[0084] 8. The detection device has a reset circuit 1200, which can reset the closing, opening, energy storage time, and refusal command;

[0085] 9. The detection device has power supply on both sides and can meet the requirements of both electromagnetic and electronic testing.

[0086] The detection device according to the embodiment of the present invention can meet the functional testing of 10kV feeder automation terminals of different types and different opening and closing voltage levels of the State Grid and the Southern Grid, avoiding the problem of replacing different types of test devices when detecting different types, improving detection efficiency, reducing space occupancy, and reducing the probability of wiring errors.

[0087] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A detection device for a feeder automation terminal, characterized in that: include: Input interface, used for receiving input signals; A voltage identification conversion circuit, connected to the input interface, for identifying the voltage level of the input signal and converting the input signal into a 24V control signal; A closing time relay, connected to the voltage identification conversion circuit, for setting the closing time; A trip time relay, connected to the voltage identification conversion circuit, for setting the trip time; An opening and closing circuit, connected to the closing time relay and the opening time relay respectively, for driving the circuit breaker to open or close; An energy storage circuit, used for storing energy for the circuit switch; Grounding switch circuit, used to control the opening and closing status of the grounding switch; Isolating knife circuit, used to control the opening and closing status of the isolating switch; A detection circuit, used to detect the energy storage state of the circuit breaker, the opening and closing states of the grounding switch, and the opening and closing states of the isolating switch; Switching circuit, used to switch the detection circuits of the power supply side voltage, load side voltage and current of the feeder automation terminal; A conversion circuit, when the feeder automation terminal is an electronic feeder automation terminal, the switching circuit is connected to the conversion circuit, and is connected to the detection circuit of the electronic feeder automation terminal through the conversion circuit; when the feeder automation terminal is an electromagnetic feeder automation terminal, the switching circuit is connected to the electromagnetic feeder automation terminal.

2. The detection device for feeder automation terminal according to claim 1, characterized in that: The detection device further comprises a refusal circuit, and when the refusal circuit receives a refusal signal, the opening and closing circuit cannot perform an opening action.

3. The detection device for feeder automation terminal according to claim 2, characterized in that: The detection device further includes a reset circuit, and the reset circuit is used to reset the detection device.

4. The detection device for feeder automation terminal according to claim 3, characterized in that: The detection device further comprises a local-remote switching circuit, and the local-remote switching circuit is used to switch the detection device between a local state and a remote state.

5. The detection device for feeder automation terminal according to claim 4, characterized in that: The detection device also includes a switch circuit, which includes at least one of a power switch, a remote local switch, a transfer switch, a closing switch, an opening switch, a knife-isolating closing switch, a knife-isolating opening switch, a ground knife closing switch, a ground knife opening switch, a reset switch and an energy storage switch.

6. The detection device for feeder automation terminal according to claim 1, characterized in that: The detection device also includes a power-on buffer circuit and a power conversion circuit. The power conversion circuit is connected to the power-on buffer circuit. The power-on buffer circuit is used to buffer the power-on power supply. The power conversion circuit is used to convert the 24V power supply into a 12V power supply and power the conversion circuit.

7. The detection device for feeder automation terminal according to claim 1, characterized in that: The voltage identification and conversion circuit includes an identification unit, an operational amplifier unit, an indication unit and a conversion unit. The identification unit is used to identify the voltage level of the input signal, the operational amplifier unit is used to amplify the identification signal of the identification unit, the indication unit is used to display the corresponding voltage level according to the amplified identification signal, and the conversion unit is used to convert the input signal into a 24V control signal.

8. The detection device for feeder automation terminal according to claim 7, characterized in that: The indicating unit includes a plurality of indicator lights, each of which corresponds to a different voltage level.

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