CN209911451U - Electrical analog quantity acquisition device - Google Patents
Electrical analog quantity acquisition device Download PDFInfo
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- CN209911451U CN209911451U CN201920034214.9U CN201920034214U CN209911451U CN 209911451 U CN209911451 U CN 209911451U CN 201920034214 U CN201920034214 U CN 201920034214U CN 209911451 U CN209911451 U CN 209911451U
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Abstract
The utility model relates to an electrical analog quantity acquisition device, which comprises an analog quantity board card, wherein a voltage transformer is arranged on the analog quantity board card and is used for converting a large voltage signal of a monitoring circuit into a small voltage signal and realizing voltage signal sharing; each functional board card is provided with a current transformer, an analog-to-digital converter and a processor which are connected in sequence and used for acquiring voltage signals shared by the analog quantity board cards and current signals of a monitoring circuit; and the back plate is respectively connected with the voltage transformer on the analog quantity board card and the analog-to-digital converter on each functional board card. The utility model discloses the voltage signal of well analog quantity integrated circuit board can supply the sharing of polylith function integrated circuit board, has guaranteed each control line voltage, the synchronism of electric current collection, and the configuration of function integrated circuit board is the same, greatly reduced the cost of production maintenance.
Description
Technical Field
The utility model belongs to the technical field of the technique of station distribution terminal and specifically relates to an electrical analog collection system.
Background
The station power distribution terminal is an important component device for realizing power distribution automation, and monitors the working state of a multi-path 10kV power loop by collecting primary voltage and current signals of a power grid in real time, so that the requirements on the real-time performance and the accuracy of electric analog quantity collection are high. In a 10kV distribution automation system, a high-voltage side voltage or current signal is converted into a 220V or 100V large voltage signal (5A current or 1A current signal) through a primary voltage (current) transformer, the signal is input into a distribution terminal, then converted into a small signal acceptable by an analog-to-digital converter through a micro transformer, converted into a digital signal through the analog-to-digital converter and then input into a processor for calculation processing.
The lines monitored by the power distribution terminals of the station are in parallel connection, the voltage of each monitored line is the same, but the load current of each outgoing line is different, so that only 1-2 groups of voltage transformers are needed by the power distribution terminals of each station, and the corresponding number of the current transformers needs to be configured according to the number of the monitored lines. Because the way number of control is more, the miniature mutual-inductor of corresponding needs is also more, and miniature mutual-inductor is bulky, can not concentrate on a circuit board, and it mainly has two kinds of modes to solve this problem at present: one is that the mutual inductors are distributed on a plurality of circuit boards in a centralized way, and other parts such as a processor are distributed on other boards, so that a plurality of types of board cards exist, and the production and maintenance costs are high; the other method is that the mutual inductors are distributed in a distributed mode, each mutual inductor board is provided with an analog-to-digital converter and an MCU, analog signals are converted into digital signals through the analog-to-digital converters and then are collected to a data processing unit, however, sampling moments of voltage and current are different in the mode, a power distribution terminal not only needs to monitor the voltage and current states of a monitored line, but also needs to calculate electric energy power transmitted by a monitoring node, the calculation power requires strict synchronization of the phases of the voltage signal and the current signal, and otherwise, the calculation result is not accurate.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide an electrical analog quantity acquisition device, which ensures the accuracy of electrical analog quantity acquisition.
The utility model provides a technical scheme that its technical problem adopted is:
an electrical analog quantity acquisition device comprises an analog quantity board card, wherein a voltage transformer is arranged on the analog quantity board card and is used for converting a large voltage signal of a monitoring circuit into a small voltage signal and realizing voltage signal sharing; each functional board card is provided with a current transformer, an analog-to-digital converter and a processor which are connected in sequence and used for acquiring voltage signals shared by the analog quantity board cards and current signals of a monitoring circuit; and the back plate is respectively connected with the voltage transformer on the analog quantity board card and the analog-to-digital converter on each functional board card.
Furthermore, at least one detection signal line is arranged on the back plate, the number of the detection signal lines is the same as that of the function board cards, and each function board card is connected with all the detection signal lines.
Furthermore, each functional board card is provided with a power supply and at least one pull-down resistor, and the anode of each power supply is used as an enabling signal end and is connected with the detection signal lines in a one-to-one correspondence manner; the number of the pull-down resistors is the same as that of the functional board cards, one end of each pull-down resistor is connected with the detection signal line in a one-to-one correspondence mode, and the other end of each pull-down resistor is connected with the negative electrode of the power supply.
Further, the function board card has 8, 8 detection signal lines have, 8 resistance that pull down has.
Furthermore, the analog quantity board card, the function board card and the back board are connected by adopting a plug-in connector.
The utility model has the advantages that: the utility model discloses the voltage signal of well analog quantity integrated circuit board can supply the sharing of polylith function integrated circuit board, has guaranteed each control line voltage, the synchronism of electric current collection, and the configuration of function integrated circuit board is the same, greatly reduced the cost of production maintenance.
Drawings
The embodiments of the present invention will be further described with reference to the accompanying drawings:
FIG. 1 is a block diagram of the working principle of an electrical analog quantity acquisition device;
FIG. 2 is a schematic diagram of the circuit connection of the functional board;
FIG. 3 is an equivalent circuit diagram of the analog board card and the functional board card;
fig. 4 is a functional block diagram of an impedance adaptive numerical compensation system.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and 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 a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
Referring to fig. 1, the electrical analog acquisition device of the present embodiment includes an analog board 100, where the analog board 100 is provided with a voltage transformer, and is configured to convert a large voltage signal of a monitoring line into a small voltage signal and implement voltage signal sharing; eight functional board cards 200 are numbered from 1 to 8, and each functional board card 200 is provided with a current transformer, an analog-to-digital converter 201 and a processor 202 which are connected in sequence and used for collecting voltage signals shared by the analog quantity board cards 100 and current signals of a monitoring line; and the back board 300 is respectively connected with a voltage transformer on the analog board card 100 and the analog-to-digital converter 201 on each functional board card 200, wherein the voltage transformer is arranged on the analog board card 300.
The utility model discloses a mode synthesize two kinds of modes in the background art, on putting a function cardboard 200 with the current transformer who monitors a circuit, have adc 201 and treater 202 in addition on the function cardboard 200 simultaneously, the current signal acquisition of circuit, conversion all accomplish on a function integrated circuit board 200. The voltage transformers are independently distributed on the analog quantity board card 100 and used as a common unit to directly output analog voltage signals to the analog-to-digital converters of the functional board cards 200 for analog-to-digital conversion, and the synchronism of voltage and current acquisition of each monitoring loop is guaranteed. The analog quantity board card 100, the function board card 200 and the backboard 300 are connected by adopting a plug-in connector, so that the installation and the disassembly are more convenient and labor-saving.
Eight detection signal lines 301 are arranged on the backboard 300, the number of the detection signal lines 301 is the same as that of the functional board cards 200, the detection signal lines are numbered A1-A8, and each functional board card 200 is connected with all the detection signal lines 301.
Each functional board card 200 is provided with a power supply 203 and eight pull-down resistors 204, and the anode of each power supply 203 is used as an enabling signal end and is correspondingly connected with the detection signal lines 301 one by one; the number of the pull-down resistors 204 is the same as that of the functional board cards 200, one end of each pull-down resistor 204 is connected with the detection signal line 301 in a one-to-one correspondence manner, and the other end of each pull-down resistor 204 is connected with the negative electrode of the power supply 203. The detection signal line 301 is used for detecting whether the corresponding functional board card 200 is on-line.
Referring to fig. 2, after the functional board 200 is input from a1 to A8, the functional board is grounded via the pull-down resistor 204, so that the CPU detects that the functional board is at a low level when the functional board is in a suspension state from a1 to A8. The positive output end of the power supply 203 of each functional board 200 serves as An enabling signal end, the enabling signal EN1 output by the functional board 200 is only in short circuit with a1 on the backboard 300, the enabling signal EN2 output by the functional board 200 is only in short circuit with a2 on the backboard 300, and so on, so that after the nth functional board 200 is inserted into the backboard 300, the positive electrode of the power supply 203 of the nth functional board 200 is connected with An, each board can detect that An is at a high level, and the nth functional board 200 is judged to be online. By this method, each functional board 200 can know how many functional boards 200 are inserted in the electrical analog quantity acquisition device by detecting the number of high levels of a1 to A8.
Referring to fig. 3, according to thevenin's theorem, the analog board 100 may be equivalent to an ideal voltage source uS connected in series with an output impedance ZS, the functional board 200 may be equivalent to an input impedance Zn, and the plurality of functional boards 200 are connected in parallel and have equivalent impedances ZL, so that the equivalent impedance ZL may be calculated, and further, the compensation coefficient ZK is calculated to compensate the analog signal sampling value.
The analog signal actually obtained by the analog-to-digital converter 201 is uo:
wherein, the equivalent impedance ZL is Z1// Z2// …// Zn, and n is 1-8
From the above formula, it can be known that the larger ZL is, the closer the obtained voltage signal uo is to the ideal signal source us, i.e. the more accurate the collected voltage signal is. The internal resistance Zs of a signal source of an actual system cannot be equal to 0, and the input impedance Zn of an analog-to-digital conversion chip cannot be equal to infinity, so that an error cannot be avoided in an acquired signal, but the acquired voltage value can be compensated under the condition that Zs and ZL are known, namely:
wherein the equivalent impedance ZL is Z1// Z2// …// Zn, and n is 1-8; the compensation coefficient ZK is ZS + ZL/ZL.
In actual use, Zs and Zn are determined, but the number of functional boards 200 inserted in different occasions is not necessarily the same, that is, ZL varies with the application configuration, so that a device is required to automatically identify the number of functional boards 200 inserted, and perform voltage value compensation to eliminate errors caused by impedance reduction.
Known signal source output impedance by the circuit principle is less, and load impedance is bigger, and the signal value that the rear end obtained is closer to the true value of signal source more the utility model discloses well voltage analog signal is shared by polylith function integrated circuit board 200, is the load as voltage signal source promptly, and the analog to digital converter 201 passageway of these integrated circuit boards is in parallel relation, has reduced input impedance, and the signal value that leads to analog to digital converter to gather is on the small side, and the operational amplifier who increases a level high input impedance before every analog to digital converter 200 input channel under general condition is as the voltage follower, promotes input impedance, however when the analog signal quantity that needs to gather is more, the cost and the design complexity greatly increased of this kind of method. The utility model provides an impedance self-adaptation numerical compensation system has ensured the accuracy that the analog quantity gathered, and cost effectiveness is good, and the system is simple reliable.
Referring to fig. 4, the impedance adaptive numerical compensation system of the present embodiment includes the electrical analog acquisition device, and further includes a power-on detection module, where the power-on detection module is connected to a power supply of the electrical analog acquisition device, and is used to detect whether the electrical analog acquisition device is powered on; the signal jump detection module is connected with all the detection signal lines 301 and is used for detecting whether the detection signal lines 301 corresponding to the functional board cards 200 have level jumps or not; the logic OR module is respectively connected with the power-on detection module and the signal jump detection module; the signal high level counting module is respectively connected with all the detection signal lines 301 and the logic or module and is used for counting the number of high levels appearing in all the detection signal lines 301; the analog quantity numerical compensation module is connected with the signal high level statistical module and used for calling a corresponding compensation coefficient Z according to the statistical result of the signal high level statistical moduleKThe measurements of the processor 202 are compensated.
An impedance self-adaptive numerical compensation method is based on the impedance self-adaptive numerical compensation system, when a power-on detection module detects that an electrical analog quantity acquisition device is powered on, a high-level signal is output, and when the electrical analog quantity acquisition device is not powered on or powered off, a low-level signal is output; when the signal jump detection module detects that any detection signal line 301 has level jump, a high level signal is output, and when no detection signal line 301 has level jump, a low level signal is output; when the logic OR module receives a high level signal output by the power-on detection module or a high level signal output by the signal jump detection module, the logic OR module outputs a high level signal, and if the logic OR module receives low level signals output by the power-on detection module and the signal jump detection module, the logic OR module outputs a low level signal; when the signal high level statistic module receives the logic or module to output high level signal, it will detect all the signal lines 301Counting the number of middle-appearing high levels, and uploading the counting result to an analog quantity value compensation module; the analog quantity value compensation module calls a corresponding compensation coefficient Z according to the statistical result of the signal high-level statistical moduleKThe measurement results of the processor 202 are impedance compensated.
The utility model discloses a compensation system need not pass through the interactive mode of communication between the integrated circuit board, can let each function integrated circuit board 200 learn current online function integrated circuit board 200 quantity, does not need the artificial configuration, and is simple reliable, does not relate to software resource overhead, integrated circuit board address configuration, integrated circuit board differentiation scheduling problem, and all function integrated circuit board designs can be completely unanimous.
In summary, the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments can be modified or equivalent replaced without losing the technical features, and such modifications or replacements do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. The utility model provides an electric analog quantity collection system which characterized in that: comprises that
The analog quantity board card (100), wherein a voltage transformer is arranged on the analog quantity board card (100) and is used for converting a large voltage signal of a monitoring circuit into a small voltage signal and realizing voltage signal sharing;
the intelligent monitoring system comprises at least one functional board card (200), wherein each functional board card (200) is provided with a current transformer, an analog-to-digital converter (201) and a processor (202) which are connected in sequence and used for acquiring voltage signals shared by the analog quantity board cards (100) and current signals of a monitoring line;
the backboard (300) is respectively connected with a voltage transformer on the analog quantity board card (100) and an analog-to-digital converter (201) on each functional board card (200).
2. The electrical analog quantity acquisition apparatus according to claim 1, characterized in that: the backboard (300) is provided with at least one detection signal line (301), the number of the detection signal lines (301) is the same as that of the functional board cards (200), and each functional board card (200) is connected with all the detection signal lines (301).
3. The electrical analog quantity acquisition apparatus according to claim 2, characterized in that: each functional board card (200) is provided with a power supply (203) and at least one pull-down resistor (204), and the anode of each power supply (203) is used as an enabling signal end and is correspondingly connected with the detection signal lines (301) one by one; the number of the pull-down resistors (204) is the same as that of the functional board cards (200), one end of each pull-down resistor (204) is connected with the detection signal line (301) in a one-to-one correspondence mode, and the other end of each pull-down resistor (204) is connected with the negative electrode of the power supply (203).
4. The electrical analog quantity acquisition apparatus according to claim 3, characterized in that: function integrated circuit board (200) have 8, it has 8 to detect signal line (301), pull-down resistance (204) have 8.
5. The electrical analog quantity acquisition apparatus according to claim 1, characterized in that: the analog quantity board card (100), the functional board card (200) and the back plate (300) are connected through a plug-in connector.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920034214.9U CN209911451U (en) | 2019-01-09 | 2019-01-09 | Electrical analog quantity acquisition device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920034214.9U CN209911451U (en) | 2019-01-09 | 2019-01-09 | Electrical analog quantity acquisition device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109683013A (en) * | 2019-01-09 | 2019-04-26 | 珠海许继电气有限公司 | Electric simulation amount acquisition device and impedance self-adaptive numerical compensation system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109683013A (en) * | 2019-01-09 | 2019-04-26 | 珠海许继电气有限公司 | Electric simulation amount acquisition device and impedance self-adaptive numerical compensation system and method |
| CN109683013B (en) * | 2019-01-09 | 2024-06-28 | 珠海许继电气有限公司 | Electrical analog quantity acquisition device and impedance self-adaptive numerical compensation system and method |
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