Independent low-voltage alternating-current insulation monitoring device

Abstract

The utility model provides an independent low-voltage alternating-current insulation monitoring device, which is connected with a bus and a generator insulation monitoring point and comprises a host, the host is provided with interfaces X1, X2, X3, X4, X5, X6, X7, X8 and X9, the interface X1 is electrically connected with a power supply, the interfaces X2 and X4 are electrically connected with a display, the interfaces X3 and X9 are electrically connected with a power station monitor, and the interfaces X3 and X9 are electrically connected with the power station monitor. The interface X5 is connected with a bus and a generator insulation monitoring point, the interface X6 is connected with a state switch, an internal measuring plate of the host is provided with a 60-core electric connector to be connected with interfaces X7 and X8, the interfaces X7 and X8 serve as signal input ports to be connected with a current sensor, each of the interfaces X7 and X8 is provided with two signal processing modules, the signal processing modules are connected with a signal amplification circuit, and the host and the slave are combined into one. A 60-core electric connector, a signal processing module and a signal amplification circuit are used in a host to achieve the function of an original slave converter, the number and the size of equipment are reduced, and branch positioning is also facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of detection devices, in particular to an independent low-voltage AC insulation monitoring device. Background Art

[0002] As the capacity of ship power systems increases, the network structure becomes increasingly complex, and the requirements for the ability to monitor and judge the insulation status of the network are also increasing. If only the total insulation resistance value of the power network can be monitored, but the fault branch cannot be determined and the fault location cannot be achieved, it will obviously bring great difficulties to the operation and protection of the power system, because at this time, if the fault branch or location needs to be determined, the power must be cut off one area at a time and one branch at a time, and then the crew must carry a high resistance meter to search separately. This can not only fail to ensure the normal power supply of the power system, but also bring great labor intensity to the crew. Therefore, studying the monitoring of the insulation status of the ship power system network, especially the fault location technology, is of great significance to improving the power supply continuity of the ship power system and reducing the labor intensity of the crew.

[0003] like Figure 6 , Figure 7 The figure shows an existing independent low-voltage AC insulation monitoring device, which includes a host and a converter. The converter is a slave. The host needs to connect to the current sensor through the slave. When the device detects the insulation resistance value to the ground, the slave needs to cooperate with the device to locate the ground when the resistance value of the device to the ground is lower than the threshold value. The number of devices is large; and some ships have limited space, and a large number of devices will also require more volume. Therefore, there is an urgent need for an independent low-voltage AC insulation monitoring device that can be more easily positioned and has a smaller volume, but the host of the device is usually unable to directly connect to the current sensor. Utility Model Content

[0004] In view of the fact that the current independent low-voltage AC insulation monitoring devices occupy a large volume and have weak positioning capabilities, the utility model patent provides an independent low-voltage AC insulation monitoring device that combines a host and a slave into one, and by adding corresponding circuits in the host to enable the host to realize the functions of the original slave converter, the number and volume of equipment are reduced.

[0005] In order to achieve the above-mentioned purpose, the embodiment of the utility model adopts the following technical scheme:

[0006] An independent low-voltage AC insulation monitoring device comprises a host, the host is externally connected to a power supply, a display, a power station monitor, a status switch and a current sensor, the independent low-voltage AC insulation monitoring device is connected to a busbar and a generator insulation monitoring point, the host is provided with X1, X2, X3, X4, X5, X6, X7, X8 and X9 interfaces, the interface X1 is electrically connected to the power supply, the interfaces X2 and X4 are electrically connected to the display, the interfaces X3 and X9 are electrically connected to the power station monitor, the interface X5 is connected to the busbar and the generator insulation monitoring point, the interface X6 is connected to the status switch, the internal measurement board of the host is provided with 60-core electrical connections, the 60-core electrical connections are connected to interfaces X7 and X8, the interfaces X7 and X8 are connected to the current sensor as signal input ports, X7 and X8 are respectively provided with two signal processing modules, and the signal processing modules are connected to a signal amplification circuit.

[0007] According to one aspect of the utility model, the 60-core electrical connection is provided with S1i+~S32i+ pins, the interface X7 is connected to the pins S1i+~S16i+, and the interface X8 is connected to S17i+~S32i+.

[0008] According to one aspect of the present invention, the signal processing module is an ADCS8162 chip.

[0009] According to one aspect of the utility model, the signal processing module is provided with V1 to V8 pins, each of which is connected to one end of a single signal amplifying circuit, and the other end of the signal amplifying circuit is electrically connected to the 60-core circuit.

[0010] According to one aspect of the utility model, the other end of any signal amplifying circuit is connected to an unconnected pin among the S1i+ to S32i+ pins in the 60-core electrical connection.

[0011] According to one aspect of the utility model, the signal amplifying circuit is provided with a primary operational amplifying module and a secondary operational amplifying module, and the signal amplifying circuit uses the output of the primary operational amplifying module as the input of the secondary operational amplifying module.

[0012] According to one aspect of the utility model, the input end of the first-stage operational amplifier module includes a first non-inverting input end, a second non-inverting input end, a first inverting input end and a second inverting input end, and the output end of the first-stage operational amplifier module includes a first output end and a second output end.

[0013] According to one aspect of the utility model, the first in-phase input terminal and the first inverting input terminal are connected to an unconnected pin among the S1i+ to S32i+ pins in the 60-core electrical circuit.

[0014] According to one aspect of the present invention, the two-stage operational amplifier module includes a third non-inverting input terminal, a third inverting input terminal, and a third output terminal.

[0015] According to one aspect of the utility model, the third output terminal of the secondary operational amplifier module is connected to any one of the pins V1 to V8 of the signal processing module.

[0016] Advantages of the implementation of the utility model: The utility model provides an independent low-voltage AC insulation monitoring device, including a host, the host is externally connected to a power supply, a display, a power station monitoring, a status switch and a current sensor, the independent low-voltage AC insulation monitoring device is connected to the bus and the generator insulation monitoring point, the host is provided with X1, X2, X3, X4, X5, X6, X7, X8 and X9 interfaces, the interface X1 is electrically connected to the power supply, the interfaces X2 and X4 are electrically connected to the display, the interfaces X3 and X9 are electrically connected to the power station monitoring, and the interface X5 is connected It is connected to the busbar and generator insulation monitoring point, and the interface X6 is connected to the status switch. The internal measurement board of the host is provided with a 60-core electrical coupler, and the 60-core electrical coupler is connected to the interfaces X7 and X8. The interfaces X7 and X8 are connected to the current sensor as signal input ports. X7 and X8 are respectively provided with two signal processing modules, and the signal processing module is connected to the signal amplification circuit, so that the host and the slave are combined into one. By using the 60-core electrical coupler, the signal processing module and the signal amplification circuit in the host, the function of the original slave converter is realized, the number and volume of equipment are reduced, and it is also convenient to locate the branch. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the independent low-voltage AC insulation monitoring device described in the utility model;

[0019] Figure 2 This is a schematic diagram of a 60-core electrical connection described in the utility model;

[0020] Figure 3 This is a schematic diagram of the signal processing module described in the utility model;

[0021] Figure 4 A circuit diagram of the signal amplifying circuit described in the utility model;

[0022] Figure 5 This is the circuit diagram of the internal communication module described in the utility model;

[0023] Figure 6 It is a schematic diagram of the overall structure of the existing independent low-voltage AC insulation monitoring device described in the background technology of the utility model;

[0024] Figure 7 This is a system schematic diagram of an existing independent low-voltage AC insulation monitoring device described in the background technology of the utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figure 1 As shown, an independent low-voltage AC insulation monitoring device includes a host, an external power supply of the host, a display, a power station monitoring, a status switch and a current sensor. The independent low-voltage AC insulation monitoring device is connected to the bus and the generator insulation monitoring point. The host is provided with X1, X2, X3, X4, X5, X6, X7, X8 and X9 interfaces. The interface X1 is electrically connected to the power supply, the interfaces X2 and X4 are electrically connected to the display, the interfaces X3 and X9 are electrically connected to the power station monitoring, the interface X5 is connected to the bus and the generator insulation monitoring point, the interface X6 is connected to the status switch, the internal measurement board of the host is provided with 60-core electrical connections, the 60-core electrical connections are connected to the interfaces X7 and X8, the interfaces X7 and X8 are connected to the current sensor as signal input ports, and X7 and X8 are respectively provided with two signal processing modules, and the signal processing modules are connected to the signal amplification circuit.

[0027] Among them, interfaces X1~X9 are arranged at the rear of the independent low-voltage AC insulation monitoring device.

[0028] like Figure 2 As shown, the 60-core electrical connection is provided with S1i+~S32i+ pins, the interface X7 is connected to the pins S1i+~S16i+, and the interface X8 is connected to S17i+~S32i+. Specifically, a signal processing module in the interface X7 is connected to the pins S1i+~S8i+, and the other signal processing module is connected to the pins S9i+~S16i+; a signal processing module in the interface X8 is connected to the pins S17i+~S24i+, and the other signal processing module is connected to the pins S25i+~S32i+.

[0029] like Figure 3As shown, the ADCS8162 chip is used as the signal processing module. Pins 49, 51, 53, 55, 57, 59, 61, and 63 of the signal processing module are V1, V2, V3, V4, V5, V6, V7, and V8 pins, respectively. Each pin is connected to one end of a single signal amplifying circuit, and the other end of the signal amplifying circuit is electrically connected to the 60-core circuit.

[0030] Specifically, taking one of the signal processing modules connected to interface X7 as an example, the signal processing module is connected to pins S1i+~S8i+, that is, a signal amplification circuit is connected through the V1 pin, which can be regarded as the input end of the signal amplification circuit; the other end of the signal amplification circuit, that is, the output end of the signal amplification circuit is connected to an unconnected pin among the S1i+~S8i+ pins in the 60-core electrical connection, usually connected in sequence, that is, connected to the S1i+ pin. Similarly, V2 is connected to an identical signal amplification circuit and connected to pin S2i+.

[0031] Similarly, the above situation is replaced with a signal processing module of interface X8, and the V1~V8 pins of the signal processing module are respectively connected to the input end of a signal amplifying circuit, and the output ends of the above signal amplifying circuits are sequentially connected to the S17i+~S24i+ pins in the 60-core electrical connection.

[0032] like Figure 4 As shown, each signal amplifying circuit has the same configuration, and is provided with a primary operational amplifying module U1 and a secondary operational amplifying module U2.

[0033] The model of the first-stage operational amplifier module U1 is SGMOP17C-2. The input end of the first-stage operational amplifier module U1 includes a first non-inverting input terminal IN1+, a second non-inverting input terminal IN2+, a first inverting input terminal IN1- and a second inverting input terminal IN2-. The output end of the first-stage operational amplifier module U1 includes a first output terminal OUT1 and a second output terminal OUT2. The first-stage operational amplifier module U1 also includes a positive power supply input V+ pin and an inverting power supply input V- pin.

[0034] The model of the secondary operational amplifier module U2 is SGMOP17C, and includes a third non-inverting input terminal IN3+, a third inverting input terminal IN3-, a third output terminal OUT3, a positive power input V+ pin, and an inverting power input V- pin.

[0035] The pin OUT2 of the first-stage operational amplifier module U1 is connected to one end of the resistor R12, and the other end of the resistor R12 is connected to the in-phase input terminal IN3+ of the second-stage operational amplifier module U2, that is, the output terminal OUT2 of the first-stage operational amplifier module U1 is connected to the in-phase input terminal IN3+ of the second-stage operational amplifier module U2 through the series resistor R12, wherein the resistor R12 uses a 10KΩ resistor.

[0036] The non-inverting input terminal IN1- and the inverting input terminal IN1+ are connected to the pin S1i+, and the S1i+ pin is connected to the inverting input terminal IN1- through the resistor R1 and the resistor R5; the S1i+ pin is connected to the non-inverting input terminal IN1+ through the bidirectional transient suppression diode D1 and the resistor R6 in series, and the resistors R2 and R3 are also connected in parallel between the positive input terminal IN1+ and the inverting input terminal IN1-, and the capacitor C1 is connected in parallel between the resistors R5 and R6, and the inverting input terminal IN1- is connected to the output terminal OUT1 after being connected in series with the capacitor C2, and a resistor R4 is also provided between the capacitors C1 and C2;

[0037] Among them, the resistance value of resistor R1 is 15KΩ, the resistance values ​​of resistors R2 and R3 are both 100Ω, the resistance values ​​of resistors R4 and R5 are both 68KΩ, the resistance value of resistor R6 is 30KΩ, the capacitance of capacitor C1 is 1μF, and the capacitance of capacitor C2 is 47nF.

[0038] The non-inverting input terminal IN2+ is connected in series with a resistor R10 and then grounded, the inverting input terminal IN2- is connected in series with a resistor R7 and a resistor R8 and then connected to the output terminal OUT1, the inverting input terminal IN2- is connected to the output terminal OUT2 through a series capacitor C4, the resistor R8 is connected in parallel with the capacitor C4 and the resistor R9 and is connected in series with the capacitor C3 and then grounded;

[0039] The resistance value of the resistor R7 is 15KΩ, the resistance values ​​of the resistors R8 and R9 are both 68KΩ, the capacitance of the capacitor C3 is 1μF, and the capacitance of the capacitor C4 is 47nF.

[0040] The V+ pin and V- pin of the first-stage operational amplifier module U1 are both connected to a 15V input, the V+ pin is connected in series with a capacitor C5 and then grounded, and the V- pin is connected in series with a capacitor C6 and then grounded;

[0041] Wherein, the capacitance of capacitors C5 and C6 are both 100nF.

[0042] The output terminal OUT3 of the secondary operational amplifier module U2 is connected to the V1 pin.

[0043] The inverting input terminal IN3- of the secondary operational amplifier module U2 is connected to the resistor R11 and then grounded. The inverting input terminal IN3- of the secondary operational amplifier module U2 is connected to the output terminal OUT3 of the secondary operational amplifier module U2 through the series resistor R13. The resistor R13 is also connected in parallel with the capacitor C7.

[0044] The resistance value of the resistor R11 is 11KΩ, the resistance value of the resistor R13 is 68KΩ, and the capacitance of the capacitor C7 is 100pF.

[0045] The positive power input and the negative power input of the secondary operational amplifier module U2 are both connected to a 15V power supply, the positive electrode of the power supply is grounded through a capacitor C9, and the negative electrode of the power supply is grounded through a capacitor C10;

[0046] Among them, the capacitance of capacitors C8 and C9 is 100nF.

[0047] In the original independent low-voltage AC insulation monitoring device, the converter interface X4 is also used as the communication port between the slave and the host. After the merger, the communication is converted from external communication to internal communication. The internal communication module diagram can be referred to Figure 5 .

[0048] Advantages of the implementation of the utility model: The utility model provides an independent low-voltage AC insulation monitoring device, including a host, an external power supply for the host, a display, a power station monitoring, a status switch and a current sensor. The independent low-voltage AC insulation monitoring device is connected to the bus and the generator insulation monitoring point. The host is provided with X1, X2, X3, X4, X5, X6, X7, X8 and X9 interfaces. Interface X1 is electrically connected to the power supply, interfaces X2 and X4 are electrically connected to the display, interfaces X3 and X9 are electrically connected to the power station monitoring, interface X5 is connected to the bus and the generator insulation monitoring point, interface X6 is connected to the status switch, the internal measurement board of the host is provided with 60-core electrical couplings, the 60-core electrical couplings are connected to interfaces X7 and X8, interfaces X7 and X8 are connected to the current sensor as signal input ports, X7 and X8 are respectively provided with two signal processing modules, the signal processing modules are connected with a signal amplification circuit, the host and the slave are combined into one, and the function of the original slave converter is realized by using 60-core electrical couplings, signal processing modules and signal amplification circuits in the host, thereby reducing the number and volume of equipment and facilitating the positioning of branches.

[0049] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. An independent low-voltage AC insulation monitoring device, comprising a host, an external power supply, a display, a power station monitoring, a status switch and a current sensor, wherein the independent low-voltage AC insulation monitoring device is connected to a busbar and a generator insulation monitoring point, It is characterized in that The host is provided with interfaces X1, X2, X3, X4, X5, X6, X7, X8 and X9, interface X1 is electrically connected to the power supply, interfaces X2 and X4 are electrically connected to the display, interfaces X3 and X9 are electrically connected to the power station monitoring, interface X5 is connected to the bus and generator insulation monitoring point, interface X6 is connected to the status switch, the internal measurement board of the host is provided with 60-core electrical connections, the 60-core electrical connections are connected to interfaces X7 and X8, interfaces X7 and X8 are connected to the current sensor as signal input ports, X7 and X8 are respectively provided with two signal processing modules, and the signal processing modules are connected to the signal amplification circuit.

2. The independent low voltage AC insulation monitoring device according to claim 1, It is characterized in that The 60-core electrical connection is provided with S1i+ to S32i+ pins, the interface X7 is connected to the pins S1i+ to S16i+, and the interface X8 is connected to S17i+ to S32i+.

3. The independent low voltage AC insulation monitoring device according to claim 2, It is characterized in that The signal processing module is an ADCS8162 chip.

4. The independent low voltage AC insulation monitoring device according to claim 3, It is characterized in that The signal processing module is provided with V1 to V8 pins, each of which is connected to one end of a single signal amplifying circuit, and the other end of the signal amplifying circuit is electrically connected to the 60-core circuit.

5. The independent low voltage AC insulation monitoring device according to claim 4, It is characterized in that The other end of any signal amplifying circuit is connected to an unconnected pin among the S1i+ to S32i+ pins in the 60-core electrical connection.

6. The independent low voltage AC insulation monitoring device according to claim 5, It is characterized in that The signal amplifying circuit is provided with a primary operational amplifying module and a secondary operational amplifying module. The signal amplifying circuit uses the output of the primary operational amplifying module as the input of the secondary operational amplifying module.

7. The independent low voltage AC insulation monitoring device according to claim 6, It is characterized in that The input end of the first-stage operational amplifier module includes a first in-phase input end, a second in-phase input end, a first in-phase input end, and a second in-phase input end. The output end of the first-stage operational amplifier module includes a first output end and a second output end.

8. The independent low voltage AC insulation monitoring device according to claim 7, It is characterized in that The first in-phase input terminal and the first inverting input terminal are connected to an unconnected pin among the S1i+ to S32i+ pins in the 60-core electrical connection.

9. The independent low voltage AC insulation monitoring device according to claim 6, It is characterized in that The secondary operational amplifier module includes a third non-inverting input terminal, a third inverting input terminal and a third output terminal.

10. The independent low voltage AC insulation monitoring device according to claim 6, It is characterized in that The third output terminal of the secondary operational amplifier module is connected to any one of the pins V1 to V8 of the signal processing module.

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