Detection and control device for high-voltage power grid

Abstract

The utility model discloses a detection and control device for a high-voltage power grid. Comprising a power input unit, a first boosting transformer unit, a second boosting transformer unit, a first high-voltage relay control unit, a second high-voltage relay control unit, a high-voltage power grid unit, a first voltage detection unit, a second voltage detection unit, a first current detection unit, a second current detection unit and a single-chip microcomputer system. The power input supplies power to the whole machine, and the two boosting transformer units are controlled by the single-chip microcomputer to generate high voltages with opposite phases, and the high voltages are transmitted to the high-voltage power grid unit through the two high-voltage relay control units respectively. The two voltage detection units are used for detecting the voltage on a high-voltage power grid respectively, and the two current detection units are used for detecting the output current of the two boosting transformer units respectively; according to the detected voltage and current, the single chip microcomputer judges whether net touching, line breaking, short circuit and the like are generated or not, outputs functions and uploads information; and the other high-voltage line keeps the striking capability and the boosting transformer has no abnormal temperature rise during short circuit.

Description

Technical Field

[0001] This invention relates to the field of perimeter security technology, and in particular to control devices for high-voltage power grids. Background Technology

[0002] High-voltage electric fences are used on the walls of prisons, detention centers, and other similar facilities for 24 / 7 security and surveillance to effectively prevent prisoner escapes and illegal intrusions. These high-voltage electric fences are mainly controlled by the following two types of devices.

[0003] Before the national standard came into effect, some manufacturers used a single transformer with two sets of output windings to achieve two high-voltage circuits (see attached diagram). Figure 1 .

[0004] After the national standard came into effect, a dual-voltage system was implemented using two transformers, each with one set of output windings. (See attached diagram.) Figure 2 .

[0005] The shortcomings of existing technology:

[0006] (1) In use, high-voltage power grids are generally wired in a cross arrangement such as high voltage 1, ground wire, high voltage 2, etc., to ensure that when someone touches two adjacent wires of the power grid, they will be shocked by high voltage and touch the grid. However, in use, there may be abnormal wires that open the circuit and cause the grid to break, or the high voltage line to contact the ground wire or the high voltage line to fall to the ground and cause a short circuit. The normal control device should ensure the normal high voltage of the high-voltage power grid at all times and detect and issue corresponding status prompts in a timely manner when the grid touches, breaks, or short circuits occur to notify the staff to handle the situation.

[0007] (2) In Figure 1 In the circuit, when a short circuit to ground occurs on one high-voltage line, it will cause a severe overload on the corresponding winding of the step-up transformer, and at the same time cause the output of another winding to lose its load-carrying capacity, resulting in the loss of the strike capability of another adjacent high-voltage line; and the step-up transformer will overheat severely before the output short circuit problem is resolved, which will create a safety hazard of burning out.

[0008] (3) In Figure 2 In the circuit, when a high-voltage line short-circuits to ground, the corresponding step-up transformer will overheat abnormally due to severe overload caused by the output short circuit. Although the adjacent high-voltage line still has the ability to withstand the short circuit, the severely overheated step-up transformer will still pose a risk of burning out until the output short circuit problem is resolved. Summary of the Invention

[0009] In view of this, the purpose of this invention is to address the risks associated with existing products where a short circuit between one high-voltage line and the ground wire in a high-voltage power grid can lead to the other high-voltage line losing its strike capability, or equipment damage or potential fire due to the temperature rise of control equipment caused by a prolonged short circuit. This invention provides a device to improve the detection and control of short circuits between high-voltage lines and the ground wire. This device effectively mitigates the problem of transformer temperature rise caused by short circuits between high-voltage lines and the ground wire, reducing the risk of fire and equipment damage. Simultaneously, the original functions of normal high-voltage power grid contact detection and separate line breakage detection remain unaffected. This effectively reduces safety hazards during use and improves the reliability and safety of the equipment.

[0010] I. This invention is achieved through the following technical solution:

[0011] A high-voltage power grid detection and control device includes a power input unit, a step-up transformer unit 1 and a step-up transformer unit 2, a high-voltage relay control unit 1 and a high-voltage relay control unit 2, a high-voltage power grid unit, a voltage detection unit 1 and a voltage detection unit 2, a current detection unit 1 and a current detection unit 2, and a microcontroller system. In sequence, the power input unit is connected to the step-up transformer unit 1, the step-up transformer unit 2, and the microcontroller system. The step-up transformer unit 1 is also connected to the high-voltage relay control unit 1, the current detection unit 1, and the microcontroller system; the step-up transformer unit 2 is also connected to the high-voltage relay control unit 2, the current detection unit 2, and the microcontroller system; the high-voltage relay control unit 1 and the high-voltage relay control unit 2 are also connected to the high-voltage power grid unit and the microcontroller system; the high-voltage power grid unit is also connected to the voltage detection unit 1 and the voltage detection unit 2; and the voltage detection unit 1 and the voltage detection unit 2 are also connected to the microcontroller system.

[0012] The solution further includes: the microcontroller system has multiple detection and control ports and a grounding terminal, wherein each terminal of the microcontroller system is connected to the power input unit and one end of the first to sixth sampling resistors, as well as the control terminals of the first and second high-voltage relays and ground. A control port of the microcontroller system is connected to the power input unit, allowing AC mains power to be input to the input terminals of the first step-up transformer in step-up transformer unit one and the second step-up transformer in step-up transformer unit two. The 5KV high-voltage generated by the first step-up transformer is connected to the control terminal of the first high-voltage relay in high-voltage relay control unit one via two control ports of the microcontroller system, enabling the first high-voltage relay to conduct and transmit the high-voltage power to the +5KV high-voltage circuit in the high-voltage grid unit. The +5KV high-voltage circuit of the high-voltage grid unit is connected to voltage detection unit one. The microcontroller system detects the voltage division between the third and fourth sampling resistors of voltage detection unit one through one detection port, and judges the voltage of the +5KV high-voltage circuit of the high-voltage grid unit to identify functions such as contact with the grid, short circuit, and grid disconnection. The ground circuit of the high-voltage grid unit is connected to the first step-up transformer in step-up transformer unit one through current detection unit one. The microcontroller system detects the sampling voltage of the first sampling resistor of current detection unit one through another detection port, and judges the magnitude and change of the current in the +5KV high-voltage circuit of the high-voltage grid unit to identify functions such as normal operation, contact with the grid, and short circuit.

[0013] The solution further includes: the 5KV high-voltage generated by the second step-up transformer of the step-up transformer unit two is connected to the control terminal of the second high-voltage relay of the high-voltage relay control unit two via two other control ports of the microcontroller system, enabling the second high-voltage relay to conduct and transmit the high-voltage electricity to the -5KV high-voltage circuit in the high-voltage grid unit. The -5KV high-voltage circuit of the high-voltage grid unit is connected to the voltage detection unit two. The microcontroller system detects the voltage division between the fifth and sixth sampling resistors of the voltage detection unit two through another detection port, and judges the voltage of the -5KV high-voltage circuit of the high-voltage grid unit to identify functions such as contact with the grid, short circuit, and grid disconnection. The ground circuit of the high-voltage grid unit is connected to the second step-up transformer of the step-up transformer unit two via the current detection unit two. The microcontroller system detects the sampling voltage of the second sampling resistor of the current detection unit two through another detection port, and judges the magnitude and change of the current in the -5KV high-voltage circuit of the high-voltage grid unit to identify functions such as normal operation, contact with the grid, and short circuit.

[0014] The solution further includes: when the +5KV high-voltage circuit of the high-voltage power grid is normal and no short-circuit fault to ground occurs, the relay of the high-voltage relay control unit one remains in the conducting state, and the voltage detection unit one detects that the 5KV high-voltage voltage of the +5KV high-voltage circuit of the high-voltage power grid is normal and maintains it, so that the contact wire strike is normal; when the +5KV high-voltage circuit of the high-voltage power grid is short-circuited to ground or grounding wire, the voltage division voltage detected by the voltage detection unit one becomes 0V or lower than the set short-circuit threshold, and at the same time, the sampling voltage detected by the current detection unit one reaches the set short-circuit current threshold. After the microcontroller system identifies the detection value by the detection port, it controls the first relay of the high-voltage relay control unit one through the control port. The control terminal of the high-voltage relay disconnects the first high-voltage relay. The output voltage of the step-up transformer unit 1 supplies power to the high-voltage grid only through the high-impedance first resistor connected in parallel with the relay in the high-voltage relay control unit 1. As the load current decreases, the output voltage of the step-up transformer unit 1 recovers from less than 100V when a short circuit occurs to 5KV. When the short circuit continues, the voltage detection unit 1 detects that the voltage of the high-voltage grid is still lower than the set short-circuit threshold voltage. At the same time, the current detection unit 1 detects that the sampling voltage of the short-circuit current set after the relay is disconnected matches the threshold voltage. The microcontroller system controls the high-voltage relay control unit 1 to keep the relay disconnected. At this time, the -5KV loop voltage of the high-voltage grid is unaffected.

[0015] The solution further involves the following: After the short-circuit fault in the +5KV high-voltage circuit of the high-voltage power grid is cleared, the microcontroller system identifies that the voltage division voltage of the two sampling resistors of the voltage detection unit connected to its detection port is higher than the set short-circuit threshold. At the same time, it identifies that the sampling voltage of the current detection unit is normal. At this time, the two control ports of the microcontroller system control the first high-voltage relay to close through the control terminal of the first high-voltage relay of the connected high-voltage relay control unit. The 5KV high-voltage output from the step-up transformer unit is sent to the +5KV circuit of the high-voltage power grid through the relay of the high-voltage relay control unit, so that the voltage division voltage of the 5KV high-voltage circuit of the high-voltage power grid detected by the voltage detection unit is normal and maintained. At the same time, the current detection unit continues to maintain current detection, entering a normal monitoring state.

[0016] The solution further includes: when the -5KV high-voltage circuit of the high-voltage power grid is normal and no short-circuit fault to ground occurs, the relay of the second high-voltage relay control unit remains in the conducting state, and the voltage detection unit two detects that the 5KV high-voltage voltage of the -5KV high-voltage circuit of the high-voltage power grid is normal and maintains it, ensuring normal contact with the ground; when a short circuit occurs between the -5KV high-voltage circuit of the high-voltage power grid and the ground or grounding wire, the voltage divider voltage detected by the voltage detection unit two becomes 0V or lower than the set short-circuit threshold voltage, and at the same time, the sampling voltage detected by the current detection unit two reaches the set short-circuit current threshold. After the microcontroller system identifies the detection value based on the detection port, it controls the second high-voltage relay control unit two through the control port. The control terminal of the high-voltage relay disconnects the second high-voltage relay. The output voltage of the step-up transformer unit two supplies power to the high-voltage grid only through the high-impedance second resistor connected in parallel with the relay in the high-voltage relay control unit two. As the load current decreases, the output voltage of the step-up transformer unit two recovers from less than 100V when a short circuit occurs to 5KV. When the short circuit continues, the voltage detection unit two detects that the voltage of the high-voltage grid is still lower than the set short-circuit threshold voltage. At the same time, the current detection unit two detects that the sampling voltage of the short-circuit current set after the relay is disconnected matches the threshold voltage. The microcontroller system controls the high-voltage relay control unit two to keep the relay disconnected. At this time, the +5KV circuit voltage of the high-voltage grid is unaffected.

[0017] The solution further involves the following: After the short-circuit fault in the -5KV high-voltage circuit of the high-voltage power grid is cleared, the microcontroller system identifies that the voltage division voltage of the two sampling resistors of the voltage detection unit connected to its detection port is higher than the set short-circuit threshold. At the same time, it identifies that the sampling voltage of the current detection unit is normal. At this time, the two control ports of the microcontroller system control the second high-voltage relay to close through the control terminal of the second high-voltage relay of the high-voltage relay control unit. The 5KV high-voltage output from the step-up transformer unit is sent to the -5KV circuit of the high-voltage power grid through the relay of the high-voltage relay control unit, so that the voltage division voltage of the 5KV high-voltage circuit of the high-voltage power grid detected by the voltage detection unit is normal and maintained. At the same time, the current detection unit continues to maintain current detection and enters the normal monitoring state.

[0018] II. The beneficial effects of this invention are as follows:

[0019] It can effectively improve the problem of rapid temperature rise in transformers caused by short circuits between high-voltage lines and ground wires, reduce the risk of fire and equipment damage, and at the same time, the original high-voltage power grid contact strike detection and line break detection functions are not affected, effectively reducing safety hazards during use and improving the reliability and safety of the equipment.

[0020] III. The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the specific embodiments of the present invention or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are... Figure 1 Appendix Figure 2 This is a schematic block diagram of the structure of the prior art embodiments described above, the appendix... Figure 3 Appendix Figure 4 These are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0024] Figure 1 A schematic block diagram of a high-voltage power grid detection and control device using a single step-up transformer, based on existing technology;

[0025] Figure 2 A schematic block diagram of a high-voltage power grid detection and control device using a dual step-up transformer, based on existing technology;

[0026] Figure 3 A schematic block diagram of a high-voltage power grid detection and control device provided in an embodiment of the present invention;

[0027] Figure 4 This is a schematic circuit diagram of a high-voltage power grid detection and control device provided in an embodiment of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] To facilitate understanding of this embodiment, the following is a detailed description of the embodiment of the present invention:

[0030] This invention provides a detection and control device for high-voltage power grids, such as... Figure 3 As shown, it includes: a power input unit, a step-up transformer unit 1 and a step-up transformer unit 2, a high-voltage relay control unit 1 and a high-voltage relay control unit 2, a high-voltage power grid unit, a voltage detection unit 1 and a voltage detection unit 2, a current detection unit 1 and a current detection unit 2, and a microcontroller system.

[0031] Figure 4 This is a connection diagram of the above-mentioned detection and control devices.

[0032] In this embodiment: pin1 of the power input unit is connected to pin1 of step-up transformer unit L1, pin2 of the power input unit is connected to pin2 of step-up transformer unit L1, pin3 of the power input unit is connected to pin3 of the microcontroller system, pin4 of the power input unit is connected to pin2 of step-up transformer unit L2, and pin5 of the power input unit is connected to pin1 of step-up transformer unit L2; L1 is the first step-up transformer, L2 is the second step-up transformer, pin1 and pin2 of the step-up transformer are the input terminals of the input winding, and pin3 and pin4 are the high-voltage output terminals of the output winding.

[0033] In this embodiment: pin 4 of the step-up transformer unit L1 is connected to one end of R1 and pin 7 of K1 of the high-voltage relay control unit. The other end of R1 is connected to pin 10 of K1, pins 1 and 2 of J1 of the high-voltage power grid, pins 1 and 2 of J2 of the high-voltage power grid, and one end of R2 of the voltage detection unit. Pin 3 of the step-up transformer unit L1 is connected to pin 9 of the microcontroller system and one end of R4 of the current detection unit. The other end of R4 is grounded. Pin 7 of K1 of the high-voltage relay control unit is connected to pin 8 of the voltage detection unit. n1 is connected to pin 2 of the microcontroller system, and pin 6 of K1 is connected to pin 1 of the microcontroller system; K1 is the first high-voltage relay, pins 1 and 6 are control terminals, and pins 7 and 10 are switch terminals; R1 is the first resistor, and R4 is the first sampling resistor; the lines between J1 and J2 form a high-voltage power grid, where pin 1 of J1 is the positive input terminal, pin 2 of J1 is the positive output terminal, pin 5 of J1 is the negative input terminal, pin 4 of J1 is the negative output terminal, and pins 3 of J1 and J2 are ground terminals.

[0034] In the embodiment: the other end of R2 of the voltage detection unit is connected to one end of R3 and pin8 of the microcontroller system, and the other end of R3 is grounded; R2 is the third sampling resistor and R3 is the fourth sampling resistor.

[0035] In this embodiment: pin 3 of J1 and pin 3 of J2 of the high-voltage power grid are connected and grounded; pin 4 of J1 of the high-voltage power grid is connected to pin 5 of J1, pins 4 and 5 of J2, one end of R6 of voltage detection unit two, one end of R5 of high-voltage relay control unit two, and pin 10 of K2, respectively; the other end of R6 of voltage detection unit two is connected to one end of R7 and pin 7 of the microcontroller system, and the other end of R7 is grounded; K2 is the second high-voltage relay, pins 1 and 6 are control terminals, and pins 7 and 10 are switch terminals; R5 is the second resistor, R6 is the fifth sampling resistor, and R7 is the sixth sampling resistor.

[0036] In the embodiment: pin7 of K2 of the high-voltage relay control unit 2 is connected to the other end of R5 and pin4 of L2 of the step-up transformer unit 2, pin6 of K2 is connected to pin5 of the microcontroller system, and pin1 of K2 is connected to pin4 of the microcontroller system.

[0037] In the embodiment: one end of R8 of the current detection unit 2 is connected to pin3 of the step-up transformer unit 2 L2 and pin6 of the microcontroller system respectively, the other end of R8 is grounded, and pin10 of the microcontroller system is grounded; R8 is the second sampling resistor; pin1, pin2, pin3, pin4, and pin5 of the microcontroller system are control terminals, pin6, pin7, pin8, and pin9 are detection terminals, and pin10 is the ground terminal.

[0038] The specific detection and control process is as follows:

[0039] When the high-voltage circuit of a high-voltage power grid is normal and no short-circuit fault to ground has occurred:

[0040] like Figure 4As shown, the AC mains power is input to the input terminals pin1 and pin2 of L1 in step-up transformer unit 1 via the power input unit controlled by the microcontroller system. The output terminal of L1 in step-up transformer unit 1 generates a 5KV high voltage, which is transmitted to pin7 of relay K1 in high-voltage relay control unit 1 via output terminal pin4. Since pin7 and pin10 of K1 are closed and conducting under the control of the output levels of pin1 and pin2 of the microcontroller system (at this time there is no voltage difference and no current across R1), pin10 of K1 transmits the high voltage to the high-voltage grid unit via pin1 of J1 and pin1 and pin2 of J2. The +5KV high-voltage circuit formed by pin 2 of J1 is sent to pin 8 of the microcontroller system for detection after being divided by R2 and R3 of voltage detection unit 1. When the microcontroller system detects that the voltage of the +5KV high-voltage circuit is normal, it keeps L1 of step-up transformer unit 1 supplying power and K1 of high-voltage relay control unit 1 closed and conducting. When the microcontroller system detects a change in the voltage after the voltage division by R2 and R3 and combines it with the voltage change on R4 of current detection unit 1, it compares it with the preset value of the system and makes a judgment of normal alarm, network contact alarm, or network failure alarm, and records and uploads the abnormal event.

[0041] The AC mains power is input to pins 1 and 2 of L2 in step-up transformer unit 2 via a microcontroller system controlled by the power input unit. The output of L2 generates a 5KV high-voltage voltage, which is transmitted via pin 4 to pin 7 of relay K2 in high-voltage relay control unit 2. Since pins 7 and 10 of K2 are controlled by the output levels of pins 4 and 5 of the microcontroller system, they are closed and conducting (at this time, there is no voltage difference and no current across R5). Pin 10 of K2 transmits the high-voltage power to pins 5 of J1 and J2, pins 4 and 5 of J2, and pins 5 and 4 of J2 in the high-voltage grid unit. The -5KV high-voltage circuit, composed of pin 4 of the high-voltage grid unit, is sent to pin 7 of the microcontroller system for detection after being divided by R6 and R7 of the voltage detection unit 2. When the microcontroller system detects that the voltage of the -5KV high-voltage circuit is normal, it keeps L2 of the step-up transformer unit 2 supplying power and K2 of the high-voltage relay control unit 2 closed and conducting. When the microcontroller system detects a change in the voltage after the voltage division by R6 and R7 and combines it with the voltage change on R8 of the current detection unit 2, it compares it with the preset value of the system and makes a judgment of normal alarm, network contact alarm, or network failure alarm, and records and uploads the abnormal event.

[0042] When a short-circuit fault to ground occurs in the high-voltage circuit of a high-voltage power grid and during the recovery from the short-circuit fault:

[0043] like Figure 4As shown, the AC mains power is input to L1 of step-up transformer unit one via the power input unit controlled by the microcontroller system. L1 of step-up transformer unit one generates a 5KV high-voltage voltage. This high-voltage voltage is transmitted to the +5KV high-voltage circuits J1 and J2 in the high-voltage grid unit via relay K1 of the conducting high-voltage relay control unit one (at this time, there is no voltage difference and no current across R1). When a short-circuit fault to ground occurs in the +5KV high-voltage circuit of the high-voltage grid unit, the voltage divided by R2 and R3 of voltage detection unit one is 0V or close to 0V. Simultaneously, the current returning to the step-up transformer via R4 of current detection unit one through the ground wire becomes the sampling voltage of a large short-circuit current. The microcontroller system detects the abnormal large current sampling voltage at pin 9 and the abnormal voltage of 0V or close to 0V at pin 8. By comparing these values ​​with the system's preset values, the microcontroller... System pins 1 and 2 supply power to pins 1 and 6 of relay K1 in high-voltage relay control unit 1, causing pins 7 and 10 of K1 to disconnect. The current loop changes from the original pin 4 of step-up transformer unit 1 L1 through pins 7 and 10 of high-voltage relay control unit 1 K1 to pin 1 of the positive input J1 of the high-voltage grid, to pin 4 of step-up transformer unit 1 L1 through R1 of high-voltage relay control unit 1 to pin 1 of the positive input J1 of the high-voltage grid. After the high-voltage grid is short-circuited, the current loop returns to pin 3 of step-up transformer unit 1 L1 through R4 of current detection unit 1. Since R1 is a high-impedance resistor, the problem of large short-circuit current disappears, the load of L1 is significantly reduced, and L1 returns to normal 5KV output. At the same time, the microcontroller system records and uploads the abnormal event of short-circuit alarm.

[0044] When the short circuit continues, the voltage divided by R2 and R3 in voltage detection unit one is still 0V or close to 0V. The microcontroller system detects that the voltage of the high-voltage grid is still lower than the set threshold. At the same time, it detects that the sampled value of R4 in current detection unit one matches the set short-circuit current value for relay disconnection. The microcontroller system controls relay K1 in high-voltage relay control unit one to disconnect and maintain this state. At this time, the -5KV circuit voltage of the high-voltage grid is not affected by the +5KV circuit.

[0045] When the short circuit fault in the +5KV high-voltage circuit of the high-voltage power grid is cleared, the microcontroller system detects that the voltage divided by R2 and R3 in voltage detection unit one is higher than the set short circuit threshold. At the same time, the sampling value of R4 in current detection unit one is not abnormal. At this time, pin1 and pin2 of the microcontroller system become no output voltage, so that pin7 and pin10 of relay K1 in high-voltage relay control unit one are restored to the conducting state. The 5KV high-voltage output from L1 of step-up transformer unit one is sent from pin4 of L1 through pin7 and pin10 of high-voltage relay control unit one to pin1 of positive input J1 of high-voltage power grid, and then to the +5KV circuit of high-voltage power grid. The microcontroller system simultaneously detects and compares the voltage divided by R2 and R3 in voltage detection unit one with the sampling value of R4 in current detection unit one with the set value. If it determines that the voltage and current are normal, it outputs high-voltage voltage and maintains the relay state, entering the normal monitoring state.

[0046] The AC mains power is input to L2 of step-up transformer unit two via the power input unit controlled by the microcontroller system. The 5KV high voltage generated by L2 of step-up transformer unit two is transmitted to the -5KV high voltage circuits J1 and J2 in the high voltage grid unit via relay K2 of the high voltage relay control unit two (at this time, there is no voltage difference and no current across R5). When a short circuit to ground occurs in the -5KV high voltage circuit of the high voltage grid unit, the voltage divided by R6 and R7 of voltage detection unit two is 0V or close to 0V. At the same time, the current returning to the step-up transformer through R8 of current detection unit two via the ground wire becomes the sampling voltage of the large short-circuit current. Pin 6 of the microcontroller system detects the abnormal large current sampling voltage, and pin 7 detects the abnormal voltage of 0V or close to 0V. Pin 4 and pin 7 of the microcontroller system detect the abnormal voltage of 0V or close to 0V. Pin 5 supplies power to pins 1 and 6 of relay K2 in high-voltage relay control unit 2, causing pins 7 and 10 of K2 to disconnect. The current loop changes from the original pin 4 of step-up transformer unit 2, through pins 7 and 10 of high-voltage relay control unit 2, to pin 5 of the negative input J1 of the high-voltage grid, to pin 4 of step-up transformer unit 2, through R5 of high-voltage relay control unit 2, to pin 5 of the negative input J1 of the high-voltage grid. After the high-voltage grid is short-circuited, the current returns to pin 3 of step-up transformer unit 2, through R8 of current detection unit 2, forming a loop. Since R5 is a high-impedance resistor, the problem of large short-circuit current disappears, the load of L2 is significantly reduced, and L2 returns to normal 5KV output. At the same time, the microcontroller system records and uploads the abnormal event of short-circuit alarm.

[0047] When the short circuit continues, the voltage divided by R6 and R7 in voltage detection unit two is still 0V or close to 0V. The microcontroller system detects that the voltage of the high-voltage grid is still lower than the set threshold. At the same time, it detects that the sampled value of R8 in current detection unit two matches the set short-circuit current value for relay disconnection. The microcontroller system controls relay K2 in high-voltage relay control unit two to disconnect and maintain this state. At this time, the +5KV circuit voltage of the high-voltage grid is not affected by the -5KV circuit.

[0048] When the short circuit fault in the -5KV high-voltage circuit of the high-voltage power grid is cleared, the microcontroller system detects that the voltage divided by R6 and R7 of voltage detection unit two is higher than the set short circuit threshold. At the same time, the sampling value of R8 of current detection unit two is not abnormal. At this time, pin4 and pin5 of the microcontroller system become no output voltage, so that pin7 and pin10 of relay K2 of high-voltage relay control unit two are restored to the conducting state. The 5KV high-voltage output from L2 of step-up transformer unit two is sent from pin4 of L2 through pin7 and pin10 of relay K2 of high-voltage relay control unit two to pin5 of negative input J1 of high-voltage power grid, and then sent to the -5KV circuit of high-voltage power grid. The microcontroller system simultaneously detects the voltage divided by R6 and R7 of voltage detection unit two and the sampling value of R8 of current detection unit one, and compares them with the set value. If it determines that the voltage and current are normal, it outputs high-voltage voltage and maintains the relay state, entering the normal monitoring state.

[0049] In summary, this invention, through the addition of two high-voltage relays and their parallel resistors in the control circuit design, allows the microcontroller to monitor the output voltage and current of the two high-voltage lines on the high-voltage power grid at any time. When a short-circuit fault to ground occurs, it can promptly identify and control the relays to disconnect, preventing the large current caused by the short circuit from continuing. At the same time, the other high-voltage line maintains its strike capability. When the high-voltage power grid short-circuit fault is cleared, the high-voltage voltage can be automatically restored. This reduces the workload of monitoring personnel, solves the problem of severe overheating and easy damage to equipment caused by short circuits, and eliminates the fire hazard, thereby improving product reliability and achieving the goal of safety and reliability.

[0050] This invention solves the temperature rise problem and meets national standards, while the original high-voltage power grid's normal strike detection, wire breakage detection, and other functions and parameters remain unaffected.

[0051] The hardware configuration of this invention can be flexibly controlled and modified using software, and can even be controlled remotely.

[0052] Furthermore, this embodiment of the invention provides a detection and control device for high-voltage power grids. This device has good practical value and can be used in fields such as perimeter security high-voltage power grids and electronic fences.

[0053] The apparatus provided in this embodiment of the invention can be specific hardware on a device or software or firmware installed on the device. The implementation principle and technical effects of the apparatus provided in this embodiment of the invention are the same as those in the foregoing method embodiments. For the sake of brevity, for aspects not mentioned in the apparatus embodiments, such as high and low voltage isolation detection, please refer to the corresponding content in the foregoing method embodiments.

[0054] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can all be referred to the corresponding processes in the above method embodiments, and will not be repeated here.

[0055] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0056] In addition, the functional units in the embodiments provided by the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0057] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0058] In the description of this utility model, it should be noted that the terms "one end", "the other end", "pinX (X represents a number)" and other terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. "R1" and other terms may be a combination of multiple resistors, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0059] Furthermore, the terms “first” to “sixth” are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0060] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A detection and control device for a high-voltage power grid, characterized in that, include: The system comprises a power input unit, two step-up transformer units, two high-voltage relay control units, a high-voltage grid unit, two voltage detection units, two current detection units, and a microcontroller system. In sequence, the power input unit is connected to the two step-up transformer units and the microcontroller system. The first step-up transformer unit is also connected to the first high-voltage relay control unit, the first current detection unit, and the microcontroller system. The second step-up transformer unit is also connected to the second high-voltage relay control unit, the second current detection unit, and the microcontroller system. The first and second high-voltage relay control units are also connected to the high-voltage grid unit and the microcontroller system. The high-voltage grid unit is also connected to the first and second voltage detection units. The first and second voltage detection units are also connected to the microcontroller system.

2. The detection and control device for a high-voltage power grid according to claim 1, characterized in that, The step-up transformer unit one includes a first step-up transformer, and the step-up transformer unit two includes a second step-up transformer; the power input unit is connected to the microcontroller system and is connected to the input terminals of the first step-up transformer and the second step-up transformer respectively.

3. The detection and control device for a high-voltage power grid according to claim 1, characterized in that, The high-voltage relay control unit also includes a first high-voltage relay and a first resistor. One end of the first high-voltage relay is connected to an output terminal of the first step-up transformer and one end of the first resistor. The other end of the first high-voltage relay is connected to the other end of the first resistor and the positive input terminal of the high-voltage power grid. The control terminal of the first high-voltage relay is connected to the microcontroller system. The high-voltage relay control unit 2 further includes a second high-voltage relay and a second resistor. One end of the second high-voltage relay is connected to one output terminal of the second step-up transformer and one end of the second resistor, respectively. The other end of the second high-voltage relay is connected to the other end of the second resistor and the negative input terminal of the high-voltage power grid, respectively. The control terminal of the second high-voltage relay is connected to the microcontroller system.

4. The detection and control device for a high-voltage power grid according to claim 1, characterized in that, The current detection unit includes a first sampling resistor; wherein, one end of the first sampling resistor is connected to the other output terminal of the first step-up transformer and the microcontroller system, and the other end of the first sampling resistor is grounded; The second current detection unit includes a second sampling resistor; wherein one end of the second sampling resistor is connected to the other output terminal of the second step-up transformer and the microcontroller system, and the other end of the second sampling resistor is grounded.

5. The detection and control device for a high-voltage power grid according to claim 1, characterized in that, The high-voltage grid unit includes a high-voltage grid; wherein, the positive input terminal of the high-voltage grid is connected to a first resistor and a first high-voltage relay, the negative input terminal is connected to a second resistor and a second high-voltage relay, the grounding terminal is grounded, the positive output terminal is connected to one end of a third sampling resistor, and the negative output terminal is connected to one end of a fifth sampling resistor.

6. The detection and control device for a high-voltage power grid according to claim 1, characterized in that, The voltage detection unit includes a third sampling resistor and a fourth sampling resistor; wherein, the other end of the third sampling resistor is connected to one end of the fourth sampling resistor and one end of the microcontroller system, and the other end of the fourth sampling resistor is grounded; The voltage detection unit 2 includes a fifth sampling resistor and a sixth sampling resistor; wherein, the other end of the fifth sampling resistor is connected to one end of the sixth sampling resistor and one end of the microcontroller system, and the other end of the sixth sampling resistor is grounded.

7. The detection and control device for a high-voltage power grid according to claim 1, characterized in that, The microcontroller system has multiple detection and control ports and a grounding terminal; wherein, each terminal of the microcontroller system is connected to the power input unit and one end of the first to sixth sampling resistors, as well as the control terminals of the first and second high-voltage relays and ground.

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