Substation direct current quantity acquisition device

Abstract

The utility model relates to a substation direct current quantity acquisition device, which belongs to the field of data acquisition and comprises a power supply module, an MCU microprocessor, an AC measuring unit, a communication unit, a network module and a direct current access unit. And the MCU microprocessor receives the 4-20mA quantity of the current transmitter or the 0-5V quantity of the voltage transmitter sent by the AC measuring unit, and calculates and converts the received monitoring quantities. And each piece of monitored data after calculation and conversion is uploaded to a communication gateway machine through the communication unit and the network module. The utility model solves the problems of individual dispersion, difficulty in management and relatively high failure rate due to the fact that monitoring devices which are arranged dispersedly are adopted to respectively detect the monitoring data of each transmitter in the prior art, is high in integration level and easy to manage and implement, greatly reduces the use failure rate, enables scheduling personnel to monitor the operation data of the transformer substation in real time, and improves the working efficiency of the transformer substation. And the convenience of remote management of the substation integrated automation system by dispatching personnel is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of data acquisition, and particularly relates to a DC quantity acquisition device for a substation. Background Art

[0002] For some monitored quantities in a substation, such as voltage transmitters, current transmitters, temperature transmitters, etc., data can be acquired through 4 - 20 mA or 0 - 5 V. For dispatchers to remotely manage the substation integrated automation system, it is necessary to accurately monitor various monitoring parameters of the substation. Currently, the devices for acquiring the monitoring data of each transmitter, such as voltage transmitters, current transmitters, and temperature transmitters, are dispersedly arranged. By separately acquiring the data of each transmitter and providing it to the dispatcher for monitoring various operation parameters of the substation, however, this approach has certain problems, such as being difficult to manage due to individual dispersion and having a relatively high failure rate. Content of the Utility Model

[0003] Therefore, in order to solve the problems of being difficult to manage due to individual dispersion and having a relatively high failure rate existing in the prior art where the monitoring devices arranged dispersedly are used to separately detect the monitoring data of each transmitter, such as voltage transmitters, current transmitters, and temperature transmitters, the utility model provides a DC quantity acquisition device for a substation.

[0004] The DC quantity acquisition device for a substation provided by the utility model adopts a centralized control method for acquiring the DC quantity of the substation, improves the online rate of the device, and reduces the maintenance cost.

[0005] The technical solution adopted by the utility model to solve the technical problems is as follows:

[0006] The DC quantity acquisition device for a substation of the utility model includes: an AC measurement unit, and the AC measurement unit includes: a first isolator to a sixteenth isolator, a first chip, an AD acquisition chip, a second chip, a second resistor, a fourth resistor, a sixth resistor, an eighth resistor, a tenth resistor, a twelfth resistor, a fourteenth resistor, a sixteenth resistor, a twenty - second resistor to a twenty - ninth resistor, a thirty - third resistor, a first capacitor, a second capacitor, a third capacitor, a sixteenth capacitor, a thirty - fourth capacitor, a first wiring terminal to an eighth wiring terminal;

[0007] One end of the sixteenth capacitor, one end of the thirty - fourth capacitor, and one end of the thirty - third resistor are connected to the twenty - seventh pin of the AD acquisition chip; both ends of the first capacitor are respectively connected to the twenty - fourth pin and the twenty - eighth pin of the AD acquisition chip; both ends of the second capacitor are respectively connected to the fifteenth pin and the twenty - sixth pin of the AD acquisition chip; both ends of the third capacitor are respectively connected to the fifteenth pin and the twenty - fifth pin of the AD acquisition chip;

[0008] One end of the twenty-second resistor is connected to the sixteenth pin of the AD acquisition chip, the other end of the twenty-second resistor is connected to the first pin of the first chip, the third pin of the first chip is connected to the third pin of the first isolator, the fourth pin of the first isolator is connected to one end of the second resistor and the first pin of the first terminal block, and the other end of the second resistor is connected to the fourth pin of the second isolator and the second pin of the first terminal block;

[0009] One end of the twenty-third resistor is connected to the seventeenth pin of the AD acquisition chip, the other end of the twenty-third resistor is connected to the seventh pin of the first chip, the fifth pin of the first chip is connected to the third pin of the third isolator, the fourth pin of the third isolator is connected to one end of the fourth resistor and the first pin of the second terminal block, and the other end of the fourth resistor is connected to the fourth pin of the fourth isolator and the second pin of the second terminal block;

[0010] One end of the twenty-fourth resistor is connected to the eighteenth pin of the AD acquisition chip, the other end of the twenty-fourth resistor is connected to the eighth pin of the first chip, the tenth pin of the first chip is connected to the third pin of the fifth isolator, the fourth pin of the fifth isolator is connected to one end of the sixth resistor and the first pin of the third terminal block, and the other end of the sixth resistor is connected to the fourth pin of the sixth isolator and the second pin of the third terminal block;

[0011] One end of the twenty-fifth resistor is connected to the nineteenth pin of the AD acquisition chip, the other end of the twenty-fifth resistor is connected to the fourteenth pin of the first chip, the twelfth pin of the first chip is connected to the third pin of the seventh isolator, the fourth pin of the seventh isolator is connected to one end of the eighth resistor and the first pin of the fourth terminal block, and the other end of the eighth resistor is connected to the fourth pin of the eighth isolator and the second pin of the fourth terminal block;

[0012] One end of the twenty-sixth resistor is connected to the twentieth pin of the AD acquisition chip, the other end of the twenty-sixth resistor is connected to the first pin of the fourth chip, the third pin of the fourth chip is connected to the third pin of the ninth isolator, the fourth pin of the ninth isolator is connected to one end of the tenth resistor and the first pin of the fifth terminal block, and the other end of the tenth resistor is connected to the fourth pin of the tenth isolator and the second pin of the fifth terminal block;

[0013] One end of the twenty-seventh resistor is connected to the twenty-first pin of the AD acquisition chip, the other end of the twenty-seventh resistor is connected to the seventh pin of the fourth chip, the fifth pin of the fourth chip is connected to the third pin of the eleventh isolator, the fourth pin of the eleventh isolator is connected to one end of the twelfth resistor and the first pin of the sixth terminal block, and the other end of the twelfth resistor is connected to the fourth pin of the twelfth isolator and the second pin of the sixth terminal block;

[0014] One end of the twenty-eighth resistor is connected to the twenty-second pin of the AD acquisition chip, the other end of the twenty-eighth resistor is connected to the eighth pin of the fourth chip, the tenth pin of the fourth chip is connected to the third pin of the thirteenth isolator, the fourth pin of the thirteenth isolator is connected to one end of the fourteenth resistor and the first pin of the seventh terminal, and the other end of the fourteenth resistor is connected to the fourth pin of the fourteenth isolator and the second pin of the seventh terminal;

[0015] One end of the twenty-ninth resistor is connected to the twenty-third pin of the AD acquisition chip; the other end of the twenty-ninth resistor is connected to the fourteenth pin of the fourth chip, the twelfth pin of the fourth chip is connected to the third pin of the fifteenth isolator, the fourth pin of the fifteenth isolator is connected to one end of the sixteenth resistor and the first pin of the eighth terminal, and the other end of the sixteenth resistor is connected to the fourth pin of the sixteenth isolator and the second pin of the eighth terminal.

[0016] Further, the AC measurement unit further includes: the first RRM series resistor to the sixteenth RRM series resistor; the first RRM series resistor is connected to the first pin of the first isolator; the second RRM series resistor is connected to the first pin of the second isolator; the third RRM series resistor is connected to the first pin of the third isolator; the fourth RRM series resistor is connected to the first pin of the fourth isolator; the fifth RRM series resistor is connected to the first pin of the fifth isolator; the sixth RRM series resistor is connected to the first pin of the sixth isolator; the seventh RRM series resistor is connected to the first pin of the seventh isolator; the eighth RRM series resistor is connected to the first pin of the eighth isolator; the ninth RRM series resistor is connected to the first pin of the ninth isolator; the tenth RRM series resistor is connected to the first pin of the tenth isolator; the eleventh RRM series resistor is connected to the first pin of the eleventh isolator; the twelfth RRM series resistor is connected to the first pin of the twelfth isolator; the thirteenth RRM series resistor is connected to the first pin of the thirteenth isolator; the fourteenth RRM series resistor is connected to the first pin of the fourteenth isolator; the fifteenth RRM series resistor is connected to the first pin of the fifteenth isolator; the sixteenth RRM series resistor is connected to the first pin of the sixteenth isolator.

[0017] Further, it further includes: a DC access unit connected to the AC measurement unit, and the DC access unit is used to connect external various transmitters.

[0018] Further, it further includes: an MCU microprocessor connected to the AC measurement unit, and the AC measurement unit is used to collect the 4-20mA quantity of the current transmitter or the 0-5V quantity of the voltage transmitter, and transmit the collected 4-20mA quantity of the current transmitter or the 0-5V quantity of the voltage transmitter to the MCU microprocessor.

[0019] Further, it further includes: a communication unit connected to the MCU microprocessor and a network module connected to the communication unit. The MCU microprocessor is used to receive the 4-20 mA quantity of the current transmitter or the 0-5 V quantity of the voltage transmitter sent by the AC measurement unit, perform operations and conversions on the received monitored quantities, and upload the monitored quantity data after operations and conversions to the communication network shutdown through the communication unit and the network module. The communication unit and the network module are connected to provide network connection communication; the network module is used to establish a physical network connection with the remote communication network shutdown, and the communication unit is used to transmit the telecontrol digital signal in the manner of a proprietary network protocol.

[0020] Further, it further includes: a power supply module respectively connected to the MCU microprocessor, the AC measurement unit, the communication unit, the network module, and the DC access unit, and the power supply module supplies DC power to the MCU microprocessor, the AC measurement unit, the communication unit, the network module, and the DC access unit.

[0021] Further, the first isolator to the sixteenth isolator are implemented by using the AD2C541 chip.

[0022] Further, both the first chip and the second chip are implemented by using the LM2902 chip.

[0023] Further, the AD acquisition chip is implemented by using the MAX197 chip.

[0024] Further, the first terminal to the eighth terminal are implemented by using the MB312-500M2 chip.

[0025] The beneficial effects of the present utility model are as follows:

[0026] A direct current quantity acquisition device for a substation provided by the present utility model solves the problems that the monitoring data of each transmitter such as a voltage transmitter, a current transmitter, and a temperature transmitter detected by existing separately arranged monitoring devices are individually scattered and not easy to manage, and the failure rate is relatively high. It has a high integration degree, is easy to manage and implement, greatly reduces the usage failure rate, enables dispatchers to monitor the operation data of the substation in real time, and improves the convenience for dispatchers to remotely manage the integrated automation system of the substation. Description of the Drawings

[0027] Figure 1 It is a structural composition block diagram of a direct current quantity acquisition device for a substation provided by the present utility model.

[0028] Figure 2 It is a circuit diagram of the AC measurement unit.

[0029] In the figure, 1 is the power supply module, 2 is the MCU microprocessor, 3 is the AC measurement unit, 4 is the communication unit, 5 is the network module, and 6 is the DC access unit. Detailed implementation manner

[0030] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0031] A DC quantity acquisition device for a substation provided by the present utility model is mainly used to acquire various DC quantity data in the substation and send them to a remote communication network shutdown device through a local network.

[0032] See Figure 1 As shown, a DC quantity acquisition device for a substation provided by the present utility model is specifically composed of the following modules:

[0033] Power supply module 1, MCU microprocessor 2, AC measurement unit 3, communication unit 4, network module 5, and DC access unit 6.

[0034] In the present utility model, the connection relationships among the above-mentioned modules, namely the power supply module 1, the MCU microprocessor 2, the AC measurement unit 3, the communication unit 4, the network module 5, and the DC access unit 6, are as follows:

[0035] The MCU microprocessor 2, the AC measurement unit 3, the communication unit 4, the network module 5, and the DC access unit 6 are all respectively connected to the power supply module 1, and the power supply module 1 can supply DC power to each module, namely the MCU microprocessor 2, the AC measurement unit 3, the communication unit 4, the network module 5, and the DC access unit 6.

[0036] The DC access unit 6 is connected to each transmitter, the DC access unit 6 is connected to the AC measurement unit 3, the AC measurement unit 3 is connected to the MCU microprocessor 2, the MCU microprocessor 2 is connected to the communication unit 4, and the communication unit 4 is connected to the network module 5.

[0037] In the present utility model, the functions of the above-mentioned modules, namely the power supply module 1, the MCU microprocessor 2, the AC measurement unit 3, the communication unit 4, the network module 5, and the DC access unit 6, and the relationship between their functions are as follows:

[0038] The DC access unit 6 is mainly used to connect to each external transmitter;

[0039] The AC measurement unit 3 is mainly used to collect the 4 - 20mA quantity of the current transmitter or the 0 - 5V quantity of the voltage transmitter; at the same time, it transmits the collected 4 - 20mA quantity of the current transmitter or the 0 - 5V quantity of the voltage transmitter to the MCU microprocessor 2.

[0040] In this utility model, the MCU microprocessor 2 is responsible for data operation, storage, and forwarding. Specifically: The MCU microprocessor 2 is mainly used to receive the 4 - 20 mA quantity of the current transmitter or the 0 - 5 V quantity of the voltage transmitter sent by the AC measurement unit 3, and perform operations and conversions on the received monitored quantities. The data of each monitored quantity after operation and conversion can be uploaded to the communication network shutdown through the communication unit 4 and the network module 5. The communication unit 4 and the network module 5 are connected to provide network connection communication. The specific function of the network module 5 is to establish a physical network connection with the remote communication network shutdown, and the specific function of the communication unit 4 is to transmit the telecontrol digital signal in the manner of a proprietary network protocol.

[0041] In this utility model, the circuit composition of the AC measurement unit 3 is as Figure 2 shown. The AC measurement unit 3 mainly consists of the first isolator UU1 to the sixteenth isolator UU16, the first chip U1, the AD acquisition chip U3, the second chip U4, the second resistor R2, the fourth resistor R4, the sixth resistor R6, the eighth resistor R8, the tenth resistor R10, the twelfth resistor R12, the fourteenth resistor R14, the sixteenth resistor R16, the twenty - second resistor R22 to the twenty - ninth resistor R29, the thirty - third resistor R33, the first capacitor C1, the second capacitor C2, the third capacitor C3, the sixteenth capacitor C16, the thirty - fourth capacitor C34, the first RRM series resistor 1 to the sixteenth RRM series resistor 16, and the first terminal block X1 to the eighth terminal block X8.

[0042] The connection relationships between the above - mentioned modules are as follows:

[0043] One end of the sixteenth capacitor C16, one end of the thirty - fourth capacitor C34, and one end of the thirty - third resistor R33 are connected to the twenty - seventh pin 27 of the AD acquisition chip U3; both ends of the first capacitor C1 are respectively connected to the twenty - fourth pin 24 and the twenty - eighth pin 28 of the AD acquisition chip U3; both ends of the second capacitor C2 are respectively connected to the fifteenth pin 15 and the twenty - sixth pin 26 of the AD acquisition chip U3; both ends of the third capacitor C3 are respectively connected to the fifteenth pin 15 and the twenty - fifth pin 25 of the AD acquisition chip U3.

[0044] One end of the twenty - second resistor R22 is connected to the sixteenth pin 16 of the AD acquisition chip U3, the other end of the twenty - second resistor R22 is connected to the first pin 1 of the first chip U1, the third pin 3 of the first chip U1 is connected to the third pin 3 of the first isolator UU1, the fourth pin 4 of the first isolator UU1 is connected to one end of the second resistor R2 and the first pin 1 of the first terminal block X1, and the other end of the second resistor R2 is connected to the fourth pin 4 of the second isolator UU2 and the second pin 2 of the first terminal block X1.

[0045] One end of the twenty-third resistor R23 is connected to the seventeenth pin 17 of the AD acquisition chip U3, and the other end of the twenty-third resistor R23 is connected to the seventh pin 7 of the first chip U1. The fifth pin 5 of the first chip U1 is connected to the third pin 3 of the third isolator UU3. The fourth pin 4 of the third isolator UU3 is connected to one end of the fourth resistor R4 and the first pin 1 of the second terminal block X2. The other end of the fourth resistor R4 is connected to the fourth pin 4 of the fourth isolator UU4 and the second pin 2 of the second terminal block X2.

[0046] One end of the twenty-fourth resistor R24 is connected to the eighteenth pin 18 of the AD acquisition chip U3, and the other end of the twenty-fourth resistor R24 is connected to the eighth pin 8 of the first chip U1. The tenth pin 10 of the first chip U1 is connected to the third pin 3 of the fifth isolator UU5. The fourth pin 4 of the fifth isolator UU5 is connected to one end of the sixth resistor R6 and the first pin 1 of the third terminal block X3. The other end of the sixth resistor R6 is connected to the fourth pin 4 of the sixth isolator UU6 and the second pin 2 of the third terminal block X3.

[0047] One end of the twenty-fifth resistor R25 is connected to the nineteenth pin 19 of the AD acquisition chip U3, and the other end of the twenty-fifth resistor R25 is connected to the fourteenth pin 14 of the first chip U1. The twelfth pin 12 of the first chip U1 is connected to the third pin 3 of the seventh isolator UU7. The fourth pin 4 of the seventh isolator UU7 is connected to one end of the eighth resistor R8 and the first pin 1 of the fourth terminal block X4. The other end of the eighth resistor R8 is connected to the fourth pin 4 of the eighth isolator UU8 and the second pin 2 of the fourth terminal block X4.

[0048] One end of the twenty-sixth resistor R26 is connected to the twentieth pin 20 of the AD acquisition chip U3, and the other end of the twenty-sixth resistor R26 is connected to the first pin 1 of the fourth chip U4. The third pin 3 of the fourth chip U4 is connected to the third pin 3 of the ninth isolator UU9. The fourth pin 4 of the ninth isolator UU9 is connected to one end of the tenth resistor R10 and the first pin 1 of the fifth terminal block X5. The other end of the tenth resistor R10 is connected to the fourth pin 4 of the tenth isolator UU10 and the second pin 2 of the fifth terminal block X5.

[0049] One end of the twenty-seventh resistor R27 is connected to the twenty-first pin 21 of the AD acquisition chip U3, and the other end of the twenty-seventh resistor R27 is connected to the seventh pin 7 of the fourth chip U4. The fifth pin 5 of the fourth chip U4 is connected to the third pin 3 of the eleventh isolator UU11. The fourth pin 4 of the eleventh isolator UU11 is connected to one end of the twelfth resistor R12 and the first pin 1 of the sixth terminal block X6. The other end of the twelfth resistor R12 is connected to the fourth pin 4 of the twelfth isolator UU12 and the second pin 2 of the sixth terminal block X6.

[0050] One end of the twenty-eighth resistor R28 is connected to the twenty-second pin 22 of the AD acquisition chip U3, and the other end of the twenty-eighth resistor R28 is connected to the eighth pin 8 of the fourth chip U4. The tenth pin 10 of the fourth chip U4 is connected to the third pin 3 of the thirteenth isolator UU13. The fourth pin 4 of the thirteenth isolator UU13 is connected to one end of the fourteenth resistor R14 and the first pin 1 of the seventh terminal block X7. The other end of the fourteenth resistor R14 is connected to the fourth pin 4 of the fourteenth isolator UU14 and the second pin 2 of the seventh terminal block X7.

[0051] One end of the twenty-ninth resistor R29 is connected to the twenty-third pin 23 of the AD acquisition chip U3; the other end of the twenty-ninth resistor R29 is connected to the fourteenth pin 14 of the fourth chip U4. The twelfth pin 12 of the fourth chip U4 is connected to the third pin 3 of the fifteenth isolator UU15. The fourth pin 4 of the fifteenth isolator UU15 is connected to one end of the sixteenth resistor R16 and the first pin 1 of the eighth terminal block X8. The other end of the sixteenth resistor R16 is connected to the fourth pin 4 of the sixteenth isolator UU16 and the second pin 2 of the eighth terminal block X8.

[0052] Among them, the first RRM series resistor 1 is connected to the first pin 1 of the first isolator UU1; the second RRM series resistor 2 is connected to the first pin 1 of the second isolator UU2; the third RRM series resistor 3 is connected to the first pin 1 of the third isolator UU3; the fourth RRM series resistor 4 is connected to the first pin 1 of the fourth isolator UU4; the fifth RRM series resistor 5 is connected to the first pin 1 of the fifth isolator UU5; the sixth RRM series resistor 6 is connected to the first pin 1 of the sixth isolator UU6; the seventh RRM series resistor 7 is connected to the first pin 1 of the seventh isolator UU7; the eighth RRM series resistor 8 is connected to the first pin 1 of the eighth isolator UU8; the ninth RRM series resistor 9 is connected to the first pin 1 of the ninth isolator UU9; the tenth RRM series resistor 10 is connected to the first pin 1 of the tenth isolator UU10; the eleventh RRM series resistor 11 is connected to the first pin 1 of the eleventh isolator UU11; the twelfth RRM series resistor 12 is connected to the first pin 1 of the twelfth isolator UU12; the thirteenth RRM series resistor 13 is connected to the first pin 1 of the thirteenth isolator UU13; the fourteenth RRM series resistor 14 is connected to the first pin 1 of the fourteenth isolator UU14; the fifteenth RRM series resistor 15 is connected to the first pin 1 of the fifteenth isolator UU15; the sixteenth RRM series resistor 16 is connected to the first pin 1 of the sixteenth isolator UU16.

[0053] In the present utility model, the first isolator UU1 to the sixteenth isolator UU16 can be specifically implemented by an AD2C541 chip. However, it is not limited thereto.

[0054] In this utility model, the first chip U1 can be specifically implemented by using an LM2902 chip. However, it is not limited to this.

[0055] In this utility model, the AD acquisition chip U3 can be specifically implemented by using a MAX197 chip. However, it is not limited to this.

[0056] In this utility model, the second chip U4 can be specifically implemented by using an LM2902 chip. However, it is not limited to this.

[0057] In this utility model, the resistance values of the first RRM series resistor 1 to the sixteenth RRM series resistor 16 are all 1K.

[0058] In this utility model, the first wiring terminal X1 to the eighth wiring terminal X8 can be specifically implemented by using an MB312-500M2 chip. However, it is not limited to this.

[0059] In this utility model, the AC measurement unit 3 is mainly used to collect the 4-20mA quantity of the current transmitter or the 0-5V quantity of the voltage transmitter; at the same time, it transmits the collected 4-20mA quantity of the current transmitter or the 0-5V quantity of the voltage transmitter to the MCU microprocessor 2. Specifically: after the DC signal is input from the first wiring terminal X1 to the eighth wiring terminal X8, it is converted into a collected signal by the first isolator UU1 to the sixteenth isolator UU16, the second chip U4, and the first chip U1. The collected signal is converted into a digital signal by the AD acquisition chip U3, and the digital signal is transmitted to the MCU microprocessor 2 for further processing.

[0060] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A DC quantity acquisition device for a substation, characterized in that, Including: AC measurement unit, the AC measurement unit includes: the first isolator to the sixteenth isolator, the first chip, the AD acquisition chip, the second chip, the second resistor, the fourth resistor, the sixth resistor, the eighth resistor, the tenth resistor, the twelfth resistor, the fourteenth resistor, the sixteenth resistor, the twenty-second resistor to the twenty-ninth resistor, the thirty-third resistor, the first capacitor, the second capacitor, the third capacitor, the sixteenth capacitor, the thirty-fourth capacitor, the first terminal to the eighth terminal; One end of the sixteenth capacitor, one end of the thirty-fourth capacitor, and one end of the thirty-third resistor are connected to the twenty-seventh pin of the AD acquisition chip; both ends of the first capacitor are respectively connected to the twenty-fourth pin and the twenty-eighth pin of the AD acquisition chip; both ends of the second capacitor are respectively connected to the fifteenth pin and the twenty-sixth pin of the AD acquisition chip; both ends of the third capacitor are respectively connected to the fifteenth pin and the twenty-fifth pin of the AD acquisition chip; One end of the twenty-second resistor is connected to the sixteenth pin of the AD acquisition chip, the other end of the twenty-second resistor is connected to the first pin of the first chip, the third pin of the first chip is connected to the third pin of the first isolator, the fourth pin of the first isolator is connected to one end of the second resistor and the first pin of the first terminal, and the other end of the second resistor is connected to the fourth pin of the second isolator and the second pin of the first terminal; One end of the twenty-third resistor is connected to the seventeenth pin of the AD acquisition chip, the other end of the twenty-third resistor is connected to the seventh pin of the first chip, the fifth pin of the first chip is connected to the third pin of the third isolator, the fourth pin of the third isolator is connected to one end of the fourth resistor and the first pin of the second terminal, and the other end of the fourth resistor is connected to the fourth pin of the fourth isolator and the second pin of the second terminal; One end of the twenty-fourth resistor is connected to the eighteenth pin of the AD acquisition chip, the other end of the twenty-fourth resistor is connected to the eighth pin of the first chip, the tenth pin of the first chip is connected to the third pin of the fifth isolator, the fourth pin of the fifth isolator is connected to one end of the sixth resistor and the first pin of the third terminal, and the other end of the sixth resistor is connected to the fourth pin of the sixth isolator and the second pin of the third terminal; One end of the twenty-fifth resistor is connected to the nineteenth pin of the AD acquisition chip, the other end of the twenty-fifth resistor is connected to the fourteenth pin of the first chip, the twelfth pin of the first chip is connected to the third pin of the seventh isolator, the fourth pin of the seventh isolator is connected to one end of the eighth resistor and the first pin of the fourth terminal, and the other end of the eighth resistor is connected to the fourth pin of the eighth isolator and the second pin of the fourth terminal; One end of the twenty-sixth resistor is connected to the twentieth pin of the AD acquisition chip, the other end of the twenty-sixth resistor is connected to the first pin of the fourth chip, the third pin of the fourth chip is connected to the third pin of the ninth isolator, the fourth pin of the ninth isolator is connected to one end of the tenth resistor and the first pin of the fifth terminal, and the other end of the tenth resistor is connected to the fourth pin of the tenth isolator and the second pin of the fifth terminal; One end of the twenty-seventh resistor is connected to the twenty-first pin of the AD acquisition chip, the other end of the twenty-seventh resistor is connected to the seventh pin of the fourth chip, the fifth pin of the fourth chip is connected to the third pin of the eleventh isolator, the fourth pin of the eleventh isolator is connected to one end of the twelfth resistor and the first pin of the sixth terminal, and the other end of the twelfth resistor is connected to the fourth pin of the twelfth isolator and the second pin of the sixth terminal; One end of the twenty-eighth resistor is connected to the twenty-second pin of the AD acquisition chip, the other end of the twenty-eighth resistor is connected to the eighth pin of the fourth chip, the tenth pin of the fourth chip is connected to the third pin of the thirteenth isolator, the fourth pin of the thirteenth isolator is connected to one end of the fourteenth resistor and the first pin of the seventh terminal, and the other end of the fourteenth resistor is connected to the fourth pin of the fourteenth isolator and the second pin of the seventh terminal; One end of the twenty-ninth resistor is connected to the twenty-third pin of the AD acquisition chip; the other end of the twenty-ninth resistor is connected to the fourteenth pin of the fourth chip, the twelfth pin of the fourth chip is connected to the third pin of the fifteenth isolator, the fourth pin of the fifteenth isolator is connected to one end of the sixteenth resistor and the first pin of the eighth terminal, and the other end of the sixteenth resistor is connected to the fourth pin of the sixteenth isolator and the second pin of the eighth terminal.

2. The DC quantity acquisition device for a substation according to claim 1, characterized in that, The AC measurement unit further includes: the first RRM series resistor to the sixteenth RRM series resistor; the first RRM series resistor is connected to the first pin of the first isolator; the second RRM series resistor is connected to the first pin of the second isolator; the third RRM series resistor is connected to the first pin of the third isolator; the fourth RRM series resistor is connected to the first pin of the fourth isolator; the fifth RRM series resistor is connected to the first pin of the fifth isolator; the sixth RRM series resistor is connected to the first pin of the sixth isolator; the seventh RRM series resistor is connected to the first pin of the seventh isolator; the eighth RRM series resistor is connected to the first pin of the eighth isolator; the ninth RRM series resistor is connected to the first pin of the ninth isolator; the tenth RRM series resistor is connected to the first pin of the tenth isolator; the eleventh RRM series resistor is connected to the first pin of the eleventh isolator; the twelfth RRM series resistor is connected to the first pin of the twelfth isolator; the thirteenth RRM series resistor is connected to the first pin of the thirteenth isolator; the fourteenth RRM series resistor is connected to the first pin of the fourteenth isolator; the fifteenth RRM series resistor is connected to the first pin of the fifteenth isolator; the sixteenth RRM series resistor is connected to the first pin of the sixteenth isolator.

3. The DC quantity acquisition device for a substation according to claim 1, wherein It further includes: A DC access unit connected to the AC measurement unit, and the DC access unit is used to connect external transmitters.

4. The DC quantity acquisition device for a substation according to claim 3, wherein, It further includes: The MCU microprocessor is connected to the AC measurement unit. The AC measurement unit is used to collect the 4 - 20 mA quantity of the current transmitter or the 0 - 5 V quantity of the voltage transmitter, and transmit the collected 4 - 20 mA quantity of the current transmitter or 0 - 5 V quantity of the voltage transmitter to the MCU microprocessor.

5. The DC quantity acquisition device for a substation according to claim 4, wherein It further includes: A communication unit connected to the MCU microprocessor and a network module connected to the communication unit. The MCU microprocessor is used to receive the 4 - 20 mA quantity of the current transmitter or the 0 - 5 V quantity of the voltage transmitter sent by the AC measurement unit, perform operations and conversions on the received monitored quantities. The data of the monitored quantities after operations and conversions are uploaded to the communication gateway through the communication unit and the network module. The communication unit and the network module are connected to provide network connection communication; the network module is used to establish a physical network connection with the remote communication gateway, and the communication unit is used to transmit the telecontrol digital signal in the manner of a proprietary network protocol.

6. The direct current quantity acquisition device for a substation according to claim 5, wherein It further includes: A power supply module respectively connected to the MCU microprocessor, the AC measurement unit, the communication unit, the network module and the DC access unit, and the power supply module supplies DC power to the MCU microprocessor, the AC measurement unit, the communication unit, the network module and the DC access unit.

7. A DC quantity acquisition device for a substation according to claim 1, characterized in that, The first isolator to the sixteenth isolator are implemented using the AD2C541 chip.

8. The direct current quantity acquisition device for a substation according to claim 1, characterized in that, Both the first chip and the second chip are implemented using the LM2902 chip.

9. The direct current quantity acquisition device for a substation according to claim 1, wherein The AD acquisition chip is implemented using the MAX197 chip.

10. The DC quantity acquisition device for a substation according to claim 1, wherein, The first terminal to the eighth terminal are implemented using the MB312 - 500M2 chip.

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