Apparatus, method and system for measuring voltage of overhead contact system, and electronic device

Abstract

Provided are an apparatus, method and system for measuring the voltage of an overhead contact system, and an electronic device. The apparatus comprises a voltage transformer (11), a direct-current measurement apparatus (12) and a control apparatus (13), wherein the voltage transformer (11) is used for collecting an alternating-current signal from an overhead contact system; the direct-current measurement apparatus (12) is used for collecting a direct-current voltage signal from the overhead contact system; and the control apparatus (13) is used for controlling a power supply circuit of a train on the basis of the alternating-current signal collected by the voltage transformer (11), a frequency, and / or the direct-current voltage signal collected by the direct-current measurement apparatus (12). It can be seen that the power supply circuit of the train is controlled by means of collecting voltages measured by the voltage transformer (11) and the direct-current measurement apparatus (12), and automatic detection and switching of voltage-type signals of an overhead contact system are achieved, thereby improving the reliability and safety of the system, and reducing the burden on operators.

Description

Network voltage detection device, method, system and electronic equipment

[0001] This application claims priority to the Chinese patent application filed with the Patent Office of China on January 15, 2024, with application number 202410056343.3 and invention name “A network voltage detection device, method, system and electronic device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of train power supply, and in particular to a network voltage detection device, method, system and electronic equipment. Background Art

[0003] Multi-flow trains are trains that can operate under two or more power supply systems. Currently, rail transit power supply systems vary across countries and regions. To meet the needs of interregional and international transportation while reducing workload and costs, the use of multi-flow trains has become a reasonable option.

[0004] Currently, multi-flow switching is primarily achieved by the driver manually confirming the power supply mode, then manually selecting the grid suppression mode and closing the relevant high-voltage control switches. However, this solution places high demands on the operator, lacks flexibility, and poses certain safety risks. An incorrect grid suppression signal could damage the vehicle's grid-side equipment and traction system, potentially leading to a serious safety accident. Therefore, ensuring the reliability of the grid suppression signal is crucial.

[0005] Summary of the Invention

[0006] The purpose of this application is to provide a grid voltage detection device, method, system and electronic equipment, which controls the power supply circuit of the train by collecting the voltage detected by the voltage transformer and the DC detection device, realizes automatic detection and switching of the grid voltage pressure signal, thereby improving the reliability and safety of the system and reducing the burden on the operator.

[0007] To solve the above technical problems, the present application provides a network voltage detection device, comprising:

[0008] Voltage transformer, DC detection device and control device;

[0009] One end of the primary winding of the voltage transformer is connected to the overhead line, the other end of the primary winding is grounded via the DC detection device, the secondary winding of the voltage transformer is connected to the first input terminal of the control device, and the output terminal of the DC detection device is connected to the second input terminal of the control device;

[0010] The control device is used to output a grid voltage suppression signal according to the voltage and / or frequency of the AC signal collected by the voltage transformer and / or the DC voltage signal collected by the DC detection device to control the power supply circuit of the train.

[0011] In one embodiment, it further includes:

[0012] A capacitor is connected in parallel with the DC detection device.

[0013] In one embodiment, the DC detection device includes a first resistor and a second resistor, one end of the first resistor is connected to one end of the primary winding, the other end of the first resistor is connected to one end of the second resistor and serves as the output end of the DC detection device and is connected to the second input end of the control device, and the other end of the second resistor is grounded.

[0014] In one embodiment, when the contact network end is in AC working condition, the capacitance of the capacitor satisfies a first preset condition;

[0015] The first preset condition is:

[0016] Wherein, C1 is the capacitance of the capacitor, R AC is the impedance parameter of the primary winding under AC working conditions, R1 is the resistance value of the first resistor, and R2 is the resistance value of the second resistor.

[0017] In one embodiment, when the contact network end is in a DC operating condition, the resistance values ​​of the first resistor and the second resistor meet a second preset condition;

[0018] The second preset condition is:

[0019] Among them, R DC is the impedance parameter of the primary winding under DC working conditions, R1 is the resistance value of the first resistor, and R2 is the resistance value of the second resistor.

[0020] In one embodiment, the control device is specifically used to determine that the contact network end is in a DC operating condition when the voltage of the AC signal is less than a first preset value, the frequency is zero, and the voltage value of the DC voltage signal is greater than a second preset value, and output a first network suppression signal to control the DC power supply circuit between the contact network end and the train end to be turned on and the AC power supply circuit to be turned off to power the train; when the voltage of the AC signal is greater than the first preset value, the frequency is a preset frequency, and the voltage value of the DC voltage signal is less than the second preset value, determine that the contact network end is in an AC operating condition, and output a second network suppression signal to control the DC power supply circuit between the contact network end and the train end to be turned off and the AC power supply circuit to be turned on to power the train.

[0021] In one embodiment, the control device is specifically used to determine that a fault has occurred at the contact network end when the voltage of the AC signal is greater than a first preset value, the frequency is not zero, and the voltage value of the DC voltage signal is greater than a second preset value, and to control the power supply circuit between the contact network end and the train end to be cut off to achieve high-voltage blocking.

[0022] To solve the above technical problems, the present application further provides a network voltage detection method, which is applied to the above network voltage detection device, and the method includes:

[0023] When the pantograph is raised, obtaining the voltage and / or frequency of the AC signal output by the secondary winding of the voltage transformer and the DC voltage signal output by the DC detection device;

[0024] A grid-connected voltage suppression signal is output according to the voltage and / or frequency of the AC signal and the voltage value of the DC voltage signal to control the power supply circuit of the train.

[0025] To solve the above technical problems, the present application further provides a network voltage detection system, which is applied to the above network voltage detection device, and the system includes:

[0026] an acquisition unit, configured to acquire the voltage and / or frequency of the AC signal output by the secondary winding of the voltage transformer and the DC voltage signal output by the DC detection device when the pantograph is raised;

[0027] A control unit is used to output a grid-type voltage signal according to the voltage and / or frequency of the AC signal and the voltage value of the DC voltage signal to control the power supply circuit of the train.

[0028] To solve the above technical problems, the present application further provides an electronic device, comprising:

[0029] Memory for storing computer programs;

[0030] The processor is configured to implement the steps of the network voltage detection method as described above when storing a computer program.

[0031] The present application provides a network voltage detection device, method, system and electronic equipment, which relate to the field of train power supply. The device includes a voltage transformer, a DC detection device and a control device; the voltage transformer is used to collect the voltage and / or frequency of the AC signal of the contact network, the DC detection device is used to collect the DC voltage signal of the contact network, and the control device is used to control the power supply circuit of the train according to the voltage and / or frequency of the AC signal collected by the voltage transformer and / or the DC voltage signal collected by the DC detection device. It can be seen that in the present application, the power supply circuit of the train is controlled by collecting the voltage detected by the voltage transformer and the DC detection device, thereby realizing automatic detection and switching of the network voltage pressure signal, thereby improving the reliability and safety of the system and reducing the burden on the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the prior art and the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] FIG1 is a structural block diagram of a network voltage detection device provided by the present application;

[0034] FIG2 is a schematic diagram of the operation of a network voltage detection device under AC working conditions provided by the present application;

[0035] FIG3 is a schematic diagram of the operation of a grid voltage detection device under DC conditions provided by the present application;

[0036] FIG4 is a flow chart of a network voltage detection method provided by the present application;

[0037] FIG5 is a structural block diagram of a network voltage detection system provided by the present application;

[0038] FIG6 is a structural block diagram of an electronic device provided in this application. DETAILED DESCRIPTION

[0039] The core of this application is to provide a grid voltage detection device, method, system and electronic equipment, which controls the power supply circuit of the train by collecting the voltage detected by the voltage transformer and the DC detection device, and realizes automatic detection and switching of the grid voltage pressure signal, thereby improving the reliability and safety of the system and reducing the burden on the operator.

[0040] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0041] To solve the above technical problems, the present application provides a network voltage detection device, as shown in FIG1 , which includes:

[0042] Voltage transformer 11, DC detection device 12 and control device 13;

[0043] One end of the primary winding of the voltage transformer 11 is connected to the overhead line, and the other end of the primary winding is grounded through the DC detection device 12. The secondary winding of the voltage transformer 11 is connected to the first input terminal of the control device 13, and the output terminal of the DC detection device 12 is connected to the second input terminal of the control device 13.

[0044] The control device 13 is used to control the power supply circuit of the train according to the voltage and / or frequency of the AC signal collected by the voltage transformer 11 and / or the DC voltage signal collected by the DC detection device 12.

[0045] In this embodiment, the grid voltage detection device includes a voltage transformer 11, a DC detection device 12, and a control device 13. Specifically, one end of the primary winding of the voltage transformer 11 is connected to the overhead line, and the other end of the primary winding is grounded through the DC detection device 12. The primary winding is a part of the voltage transformer 11 and is used to detect the voltage and / or frequency of the AC signal from the overhead line. The DC detection device 12 is grounded to the primary winding of the voltage transformer 11 and can detect the DC voltage. These two devices work together to collect AC and DC voltage information.

[0046] The secondary winding of the voltage transformer 11 is connected to the first input of a control device 13, and the output of the DC detection device 12 is connected to the second input of the control device 13. The control device 13 is a key component of the grid voltage detection device, used to receive voltage and frequency information collected by the voltage transformer 11 and the DC detection device 12. The first input of the control device 13 is connected to the secondary winding of the voltage transformer 11 to receive AC voltage and frequency information. The second input of the control device 13 is connected to the output of the DC detection device 12 to receive DC voltage information.

[0047] Finally, the control device 13 controls the train's power supply circuit based on the voltage and frequency information collected by the voltage transformer 11 and the DC detection device 12. The control device 13 analyzes and determines the collected voltage and frequency information, and controls the power supply circuit based on the results. In this way, the grid voltage detection device can achieve reliable control of the power supply circuit and improve operational flexibility and safety.

[0048] In one embodiment, it further includes:

[0049] The capacitor C1 is connected in parallel with the DC detection device 12 .

[0050] This embodiment, based on the network voltage detection device described above, additionally includes a capacitor C1, and the capacitor C1 is connected in parallel with the DC detection device 12. The capacitor C1 can separate and filter the AC and DC signals. Specifically, the capacitor C1 acts as a capacitor C1, has a low impedance in the AC signal, and can allow the AC signal to pass through. At the same time, for the DC signal, the impedance of the capacitor C1 is very high, which can almost be regarded as an open circuit state, thereby blocking the transmission of the DC signal. Therefore, the role of the capacitor C1 in the AC / DC network voltage detection device is to filter out the DC component and only transmit the AC signal by being connected in parallel between the voltage divider resistors R1 and R2. This ensures that the AC / DC control device 13 can accurately judge the working condition and avoid the occurrence of fault signals.

[0051] In summary, capacitor C1 plays the role of suppressing DC signals and transmitting AC signals in the AC / DC grid voltage detection device to ensure the normal operation and accurate judgment of the device.

[0052] In one embodiment, the DC detection device 12 includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to one end of the primary winding, the other end of the first resistor R1 is connected to one end of the second resistor R2 and serves as the output end of the DC detection device 12 and is connected to the second input end of the control device 13, and the other end of the second resistor R2 is grounded.

[0053] This embodiment describes the specific structure of the DC detection device 12 in the grid voltage detection device. The DC detection device 12 includes a first resistor R1 and a second resistor R2. One end of the first resistor R1 is connected to one end of the primary winding of the voltage transformer 11, enabling detection of the voltage signal in the primary winding. The other end of the first resistor R1 is connected to one end of the second resistor R2, which serves as the output of the DC detection device 12 and is connected to the second input of the control device 13.

[0054] In this connection, the first resistor R1 and the second resistor R2 form a resistor divider. This DC voltage signal is connected in series with the first resistor R1 and the second resistor R2, and transmits the output signal of the DC detection device 12 to the second input terminal of the control device 13. The other end of the second resistor R2 is grounded, meaning it is connected to the ground to provide a reference potential for the circuit. This helps ensure accurate detection and measurement of the DC voltage signal.

[0055] In summary, this embodiment describes how to use the first resistor R1 and the second resistor R2 to construct the DC detection device 12, and transmit the detected DC voltage signal to the control device 13 to achieve control of the train power supply circuit.

[0056] In one embodiment, when the contact network end is in AC working condition, the capacitance of the capacitor C1 meets the first preset condition;

[0057] The first precondition is:

[0058] Where C1 is the capacitance of capacitor C1, R AC is the impedance parameter of the primary winding under AC working conditions, R1 is the resistance value of the first resistor R1, and R2 is the resistance value of the second resistor R2.

[0059] This embodiment describes a restriction condition for the capacitance value of capacitor C1, which is related to the numerical relationship between capacitor C1 and resistors (R1 and R2) and their influence on voltage transformer 11. Under AC grid voltage, by setting the impedance of capacitor C1 and resistors (R1 and R2), the current in the loop is made to pass through capacitor C1 to ground as much as possible. The voltage transformer 11 is equivalent to inductive impedance and has a large impedance. Therefore, the impedance of capacitor C1 needs to be much smaller than the impedance of resistor. The specific relationship is as follows: R C1 <<R1+R2; that is Here f = 50Hz, and we can get

[0060] Furthermore, the parallel impedance of the capacitor C1 and the resistors (R1 and R2) cannot affect the primary side accuracy of the voltage transformer 11. To ensure that the voltage measurement error does not exceed 0.5%, that is: in Here f = 50Hz, that is Right now Then we can get

[0061] When designing the circuit, the voltage transformer R is known. AC The impedance parameters can be used to preliminarily deduce the capacitance of capacitor C1 and the relationship between capacitor C1 and resistors (R1 and R2), namely: and

[0062] In summary, the first preset condition in this embodiment ensures the numerical relationship between the capacitor C1 and the resistors (R1 and R2), so that the current in the loop can effectively pass through the capacitor C1 to the ground without affecting the measurement accuracy of the voltage transformer 11.

[0063] In one embodiment, when the contact network end is in a DC operating condition, the resistance values ​​of the first resistor R1 and the second resistor R2 meet a second preset condition;

[0064] The second precondition is:

[0065] Among them, R DC is the impedance parameter of the primary winding under DC working conditions, R1 is the resistance value of the first resistor R1, and R2 is the resistance value of the second resistor R2.

[0066] Under DC grid voltage, the voltage transformer 11 is equivalent to the winding impedance, which is relatively small. The current through the primary DC loop cannot exceed the maximum current that the voltage transformer 11 can withstand, to avoid overheating of the voltage transformer 11. Therefore, in order to reduce the current flowing through the voltage transformer 11 as much as possible and reduce the heating of the voltage transformer 11 winding, the voltage divider resistor can withstand as much voltage as possible: R1+R2>>R DC .

[0067] The control device 13 collects the voltage of R2. In order to collect low voltage and facilitate the reduction of insulation level, the collected voltage range is recommended to be set to 200V-300V (about 10% of the DC grid voltage). R1 ​​bears more voltage, that is: Right now: R1>>R2.

[0068] Furthermore, in order to improve fault redundancy and reduce the heat generated by a single resistor, it is recommended that R1 and R2 be connected in series with multiple resistors.

[0069] f can be selected based on the specific circuit and is also applicable to AC15kV, 17.5Hz. After selecting and setting the above parameters, the added resistance and capacitance C1 will not affect the accuracy of the voltage signal, and the resulting high-precision voltage signal can be used to control the traction system.

[0070] Specifically, at a nominal AC25kV catenary voltage, the voltage error does not exceed 1% when AC17.5kV ≤ grid voltage < AC19kV, and does not exceed 0.5% when AC19kV ≤ grid voltage ≤ AC29kV. At a nominal DC3000V catenary voltage, the voltage error does not exceed 0.5% when DC2kV ≤ grid voltage ≤ DC3.9kV.

[0071] To solve the above technical problems, the present application further provides a network voltage detection method, which is applied to the above network voltage detection device, as shown in FIG4 , and includes:

[0072] S1: When the pantograph is raised, the voltage and / or frequency of the AC signal output by the secondary winding of the voltage transformer 11 and the DC voltage signal output by the DC detection device 12 are obtained;

[0073] In the grid voltage detection method, this step refers to the step of obtaining the AC voltage and frequency signal output by the secondary winding of the voltage transformer 11 and the DC voltage signal output by the DC detection device 12 when the pantograph is raised. First, when the pantograph of the train is raised, the secondary winding of the voltage transformer 11 will sense the AC signal. The voltage transformer 11 is a device for measuring the contact network voltage, and its primary winding is connected to the contact network. The AC signal is provided by the contact network, and its size and frequency can be changed according to actual conditions. Secondly, the DC detection device 12 obtains the output of the DC voltage signal through the primary winding of the grounded voltage transformer 11. The DC detection device 12 is a device specifically used to detect DC voltage, and it is connected to the primary winding of the voltage transformer 11.

[0074] S2: Control the power supply circuit of the train according to the voltage and / or frequency of the AC signal and the voltage value and frequency of the DC voltage signal.

[0075] In step S2, the control device 13 uses the voltage and / or frequency of the AC signal and the voltage value of the DC voltage signal to control the overhead power supply circuit. The control device 13 is responsible for processing and analyzing the signals and determining the appropriate control operation for the train's power supply circuit based on the magnitude and changes of the signals. By comparing the voltage and / or frequency of the AC signal with the voltage value of the DC voltage signal, the control device 13 can identify problems with the overhead power supply circuit, such as excessively high or low voltage, and then implement appropriate control measures to ensure the proper operation of the train's power supply circuit, thereby ensuring safe and stable power supply.

[0076] In summary, the steps in S2 describe a method for controlling a train's power supply circuit based on the voltage values ​​of an AC signal and a DC voltage signal. This method can monitor and process the voltage signals to achieve timely control of the power supply circuit, thereby meeting the train's power needs and ensuring stable and secure power supply.

[0077] In one embodiment, the control device 13 is specifically used to determine that the contact network end is in a DC operating condition when the voltage value of the AC signal is less than a first preset value, the frequency is zero, and the voltage value of the DC voltage signal is greater than a second preset value, and output a first network suppression signal to control the DC power supply circuit between the contact network end and the train end to be turned on and the AC power supply circuit to be turned on to power the train; when the voltage value of the AC signal is greater than the first preset value, the frequency is a preset frequency, and the voltage value of the DC voltage signal is less than a second preset value, determine that the contact network end is in an AC operating condition, and output a second network suppression signal to control the DC power supply circuit between the contact network end and the train end to be turned on and the AC power supply circuit to be turned on to power the train.

[0078] This embodiment describes a specific method for controlling a train power supply circuit. In this method, the voltage values ​​of the AC and DC voltage signals are determined to determine the operating condition of the overhead contact network (AC or DC). Based on the determination result, corresponding control operations are performed to provide appropriate power to the train.

[0079] Specifically, if the voltage of the AC signal is less than a first preset value, the frequency is zero, and the voltage of the DC voltage signal is greater than a second preset value, it indicates that the overhead line is operating in a DC state. In this case, the control device 13 will output a first overhead line suppression signal to shut off the AC power supply circuit and conduct the DC power supply circuit to power the train.

[0080] Conversely, if the voltage of the AC signal is greater than the first preset value, the frequency is at the preset frequency, and the voltage of the DC signal is less than the second preset value, it indicates that the overhead line is operating in an AC state. In this case, the control device 13 will output a second overhead line suppression signal to shut off the DC power supply circuit and open the AC power supply circuit to power the train.

[0081] In an ideal state, the frequency under AC working conditions is 50 Hz (ie, the preset frequency is 50 Hz), and the frequency under DC working conditions is zero.

[0082] Through the above control operations, different over-the-cable suppression signals can be output according to different working conditions to switch and adjust the power supply circuit to ensure that the train can obtain appropriate power supply. This ensures that the train can operate normally under different over-the-cable working conditions and improves the reliability and stability of the power supply.

[0083] In one embodiment, the control device 13 is specifically used to determine that a fault has occurred at the contact network end when the voltage value of the AC signal is greater than a first preset value, the frequency is not zero, and the voltage value of the DC voltage signal is greater than a second preset value, and to control the power supply circuit between the contact network end and the train end to be cut off to achieve high-voltage blocking.

[0084] In this embodiment, the train's power supply circuit is controlled based on the voltage and frequency of the AC and DC voltage signals. Specifically, when the voltage of the AC signal is greater than a first preset value, the frequency is non-zero, and the voltage of the DC signal is greater than a second preset value, a fault is determined on the catenary side, and the power supply circuit between the catenary and the train side is cut off to achieve high-voltage isolation.

[0085] In other words, the control device 13 in this embodiment uses AC signals, DC voltage, and frequency signals to monitor the train's power supply status. When both the AC and DC voltage values ​​are higher than preset values ​​and the frequency is non-zero, the system determines that both AC and DC voltage signals are present at the catenary terminal, declaring a fault. Measures are then taken to shut down the power supply to prevent high voltage at the catenary terminal from impacting the train and passengers.

[0086] This embodiment effectively detects and controls faults at the overhead line by monitoring the AC and DC voltages and comparing them with preset thresholds. This ensures that the train power supply circuit can react quickly to problems and take appropriate protective measures to ensure the safety of the train and passengers.

[0087] To solve the above technical problems, the present application further provides a network voltage detection system, which is applied to the control device 13 as described above. As shown in FIG5 , the system includes:

[0088] An acquisition unit 51 is configured to acquire the voltage and / or frequency of the AC signal output by the secondary winding of the voltage transformer 11 and the DC voltage signal output by the DC detection device 12 when the pantograph is raised;

[0089] The control unit 52 is configured to output a grid-type voltage signal according to the voltage and / or frequency of the AC signal and the voltage value of the DC voltage signal to control the power supply circuit of the train.

[0090] For an introduction to the grid voltage detection system, please refer to the above embodiments, which will not be described in detail in this application.

[0091] To solve the above technical problems, the present application further provides an electronic device, as shown in FIG6 , which includes:

[0092] Memory 61, for storing computer programs;

[0093] The processor 62 is configured to implement the steps of the above-mentioned network voltage detection method when storing the computer program.

[0094] For an introduction to the electronic device, please refer to the above embodiments, and this application will not go into details here.

[0095] It should also be noted that, in this specification, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0096] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A net pressure detection device, characterized in that, Comprising: A voltage transformer, a DC detection device and a control device; One end of the primary winding of the voltage transformer is connected to the catenary, the other end of the primary winding is grounded through the DC detection device, the secondary winding of the voltage transformer is connected to the first input end of the control device, and the output end of the DC detection device is connected to the second input end of the control device; The control device is used to output a network voltage suppression signal according to the voltage and / or frequency of the AC signal collected by the voltage transformer and / or the DC voltage signal collected by the DC detection device to control the power supply circuit of the train.

2. The net pressure detection device according to claim 1, wherein Also comprising: A capacitor, connected in parallel with the DC detection device.

3. The net pressure detection device according to claim 2, characterized in that, The DC detection device includes a first resistor and a second resistor. One end of the first resistor is connected to one end of the primary winding, the other end of the first resistor is connected to one end of the second resistor and serves as the output end of the DC detection device to be connected to the second input end of the control device, and the other end of the second resistor is grounded.

4. The net pressure detection device according to claim 3, characterized in that When the catenary end is in an AC working condition, the capacitance value of the capacitor satisfies a first preset condition; The first preset condition is: where C1 is the capacitance value of the capacitor, and R AC is the impedance parameter of the primary winding under AC conditions, R1 is the resistance value of the first resistor, and R2 is the resistance value of the second resistor.

5. The net pressure detection device according to claim 3, wherein When the catenary end is in a DC working condition, the resistance values of the first resistor and the second resistor satisfy a second preset condition; The second preset condition is: wherein, R DC is the impedance parameter of the primary winding under DC conditions, R1 is the resistance value of the first resistor, and R2 is the resistance value of the second resistor.

6. The network voltage detection device according to any one of claims 1-5, characterized in that The control device is specifically used to determine that the catenary end is in a DC working condition when the voltage of the AC signal is less than a first preset value, the frequency is zero, and the voltage value of the DC voltage signal is greater than a second preset value, and output a first network voltage suppression signal to control the DC power supply circuit between the catenary end and the train end to conduct and the AC power supply circuit to cut off to supply power to the train; when the voltage of the AC signal is greater than the first preset value, the frequency is a preset frequency, and the voltage value of the DC voltage signal is less than the second preset value, it is determined that the catenary end is in an AC working condition, and a second network voltage suppression signal is output to control the DC power supply circuit between the catenary end and the train end to cut off and the AC power supply circuit to conduct to supply power to the train.

7. The network voltage detection device according to any one of claims 1-5, characterized in that, The control device is specifically used to determine that a fault occurs at the catenary end when the voltage of the AC signal is greater than a first preset value, the frequency is not zero, and the voltage value of the DC voltage signal is greater than a second preset value, and control the power supply circuit between the catenary end and the train end to cut off to achieve high-voltage blocking.

8. A method for detecting network voltage, characterized in that, Applied to the network voltage detection device according to any one of claims 1-7, the method includes: When the pantograph is raised, obtaining the voltage and / or frequency of the AC signal output by the secondary winding of the voltage transformer and the DC voltage signal output by the DC detection device; Outputting a network voltage suppression signal according to the voltage and / or frequency of the AC signal and the voltage value of the DC voltage signal to control the power supply circuit of the train.

9. A net pressure detection system, characterized in that, Applied to the network voltage detection device according to any one of claims 1-7, the system includes: An acquisition unit, configured to obtain the voltage and / or frequency of the AC signal output by the secondary winding of the voltage transformer and the DC voltage signal output by the DC detection device when the pantograph is raised; A control unit for outputting a network voltage suppression signal according to the voltage and frequency of the AC signal and the voltage value of the DC voltage signal to control the power supply circuit of the train.

10. An electronic device, characterized in that, Comprising: A memory for storing a computer program; A processor for implementing the steps of the network voltage detection method according to any one of claims 6-8 when storing the computer program.

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