CN204855783U - On --spot check system of three -phase electric energy meter - Google Patents
On --spot check system of three -phase electric energy meter Download PDFInfo
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- CN204855783U CN204855783U CN201520468514.XU CN201520468514U CN204855783U CN 204855783 U CN204855783 U CN 204855783U CN 201520468514 U CN201520468514 U CN 201520468514U CN 204855783 U CN204855783 U CN 204855783U
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Abstract
The utility model relates to a check system discloses an on - -spot check system of three -phase electric energy meter, including establishing analogue unit (3) on analog circuit, establishing digital unit (1) on digital circuit, still keep apart module (2) including connecting modulus between analogue unit (3) and digital unit (1), the modulus is kept apart the signal that module (2) transmits between to analog circuit and digital circuit and is carried out power isolation. The utility model provides an on - -spot check system of three -phase electric energy meter adopts to set up modulus buffer circuit between analog circuit and the digital circuit, increases the temperature compensating module through signal input part for the system has stronger interference killing feature and higher reliability, has also improved the measurement accuracy of system greatly.
Description
Technical field
The utility model relates to a kind of check system, particularly relates to a kind of three-phase electric energy meter on-site check system.
Background technology
Mainly there are the following problems for existing three-phase electric energy meter on-site check system: one is lack modulus buffer circuit between mimic channel and digital circuit, signal does not carry out isolated from power in analog-digital conversion process, make in signal processing that system rejection to disturbance ability is more weak, reliability is lower, and finally affect the measuring accuracy of detection system; Two is that system lacks temperature compensation function, and due to tester and interior current transformer small volume thereof, sampling mode generally all adopts amplifier to sample, and temperature sensitivity is large, causes from heat affecting large, also greatly have impact on the measuring accuracy of tester.
Summary of the invention
Mainly there is following shortcoming for three-phase electric energy meter on-site check system existing in prior art in the utility model: one is lack modulus buffer circuit between mimic channel and digital circuit, signal does not carry out isolated from power in analog-digital conversion process, make in signal processing that system rejection to disturbance ability is more weak, reliability is lower, and finally affect the measuring accuracy of detection system; Two is that system lacks temperature compensation function, due to tester and interior current transformer small volume thereof, sampling mode generally all adopts amplifier to sample, temperature sensitivity is large, cause from heat affecting large, also greatly have impact on the measuring accuracy of tester, provide and modulus buffer circuit is set between a kind of mimic channel and digital circuit realizes isolated from power and increase temperature compensation module making that system rejection to disturbance ability is comparatively strong, reliability is higher and the three-phase electric energy meter on-site check system that greatly improves the measuring precision.
In order to solve the problems of the technologies described above, the utility model is solved by following technical proposals:
A kind of three-phase electric energy meter on-site check system, comprise the analogue unit be located on mimic channel, the digital units be located in digital circuit, also comprise the modulus isolation module be connected between analogue unit and digital units, modulus isolation module carries out isolated from power to the signal transmitted between mimic channel and digital circuit.The modulus buffer circuit that have passed through back and forth on modulus isolation module of each signal between mimic channel and digital circuit has carried out isolated from power.
Mimic channel comprises three-phase voltage input circuit, three-phase current input circuit and temperature sample input circuit three part.
As preferably, analogue unit comprises three-phase voltage load module, three-phase current load module, active compensation sampling module, program control amplifier module, A/D converter, modulus isolation module respectively with A/D converter, program control amplifier model calling, three-phase voltage load module is connected by resistor voltage divider circuit with between A/D converter, be connected by current switch circuit between three-phase current load module with active compensation sampling module, be connected by current switch circuit between three-phase current load module with modulus isolation module, active compensation sampling module, program control amplifier module, A/D converter connects successively,
Three-phase voltage, from the input of three-phase voltage load module, enters A/D converter through resistor voltage divider circuit and carries out analog to digital conversion; Three-phase current inputs from three-phase current load module, active compensation sampling module, program control amplifier module is flowed through successively through current switch circuit, enter A/D converter and carry out analog to digital conversion, the current signal of active compensation sampling module to input compensates and samples, and the current signal of program control amplifier module to input carries out programming amplifying.
As preferably, analogue unit also comprises temperature compensation module, and temperature compensation module is connected with A/D converter, and temperature compensation module is used for temperature sampling, and temperature sampled signal enters A/D converter and carries out analog to digital conversion.
Temperature compensation module mainly completes and samples the temperature of instrument internal, converts the 7th passage that small voltage signal is input to hyperchannel 16 bit A/D converter to and carries out analog to digital conversion.
As preferably, digital units comprises microprocessor, blue tooth wireless communication module, industrial control board, liquid crystal touch screen, CPLD module, light-coupled isolation module, light-coupled isolation module is provided with tested table Puled input terminal, standard electric energy impulse lead-out terminal, modulus isolation module respectively with microprocessor, CPLD model calling, microprocessor respectively with industrial control board, blue tooth wireless communication module, CPLD module, light-coupled isolation model calling, light-coupled isolation module respectively with industrial control board, CPLD module, industrial control board is connected with liquid crystal touch screen, Microprocessor S3C44B0X blue tooth wireless communication module and handheld terminal carry out wireless telecommunications, liquid crystal touch screen is used for data display and touch signal input, and the data that industrial control board controls liquid crystal touch screen export,
Microprocessor S3C44B0X CPLD module exports two-way frequency signal, and a road exports sampling time sequence signal and enters modulus isolation module, another road outputting standard electrical energy impulse signals, and standard electrical energy impulse signals outputs to standard electric energy impulse lead-out terminal through light-coupled isolation module; From tested table Puled input terminal input electrical energy pulse, enter microprocessor through light-coupled isolation module and carry out error calculation.
As preferably, three-phase voltage load module comprises A phase voltage input terminal, B phase voltage input terminal, the C phase voltage input terminal that parallel input is arranged, and A phase voltage input terminal, B phase voltage input terminal, C phase voltage input terminal connect access resistor voltage divider circuit respectively.
Three-phase voltage input circuit be A phase voltage input terminal, B phase voltage input terminal and C phase voltage input terminal respectively through respective resistor voltage divider circuit, obtain three passages that three-phase voltage small-signal is input to hyperchannel 16 A/D converters and carry out analog to digital conversion.
As preferably, three-phase current load module comprises A phase current load module, B phase current load module, the C phase current load module that parallel input is arranged, and A phase current load module, B phase current load module, C phase current load module connect access current switch circuit respectively.
As preferably, A phase current load module comprises A phase terminal current transformer, the A phase split-core type meter that parallel input is arranged, B phase current load module comprises B phase terminal current transformer, the B phase split-core type meter that parallel input is arranged, and C phase current load module comprises C phase terminal current transformer, the C phase split-core type meter that parallel input is arranged.
The input of three-phase current then has two kinds of modes, mode is that three-phase current is input to inner A phase terminal current transformer, B phase terminal current transformer and a C phase terminal current transformer respectively from the current terminal of six terminal panel, obtains three-phase current small-signal and is input to respective current switch circuit respectively again.Another kind of mode is by three split core type current transformers, i.e. A phase split-core type meter, B phase split-core type meter and C phase split-core type meter.After obtaining three-phase current small-signal, then be input to current switch circuit from the split-core type meter terminal of three terminal panel.32-bit microprocessor in digital circuit exports control signal and carries out alternative control to current switch circuit.The road Small Current Signal chosen is input to active compensation sampling module and compensates and sample.Obtain three road small voltage signals and be input to respective program control amplifier module again, programming amplifying is carried out to signal.Enlargement factor is also export control signal by 32-bit microprocessor to control.Another three passages that the output signal of three program control amplifier modules is all input to hyperchannel 16 A/D converters carry out analog to digital conversion.
As preferably, industrial control board is provided with network interface, USB interface, AccessPort mouth, and network interface is used for program debug expand with communication, and USB interface is used for checking data derivation and program upgrade, and AccessPort mouth is for program debug and data monitoring.
As preferably, light-coupled isolation module is also provided with 485 meter reading communication ports of the measurement data for reading tested table.
The sampling time sequence of hyperchannel 16 A/D converters is exported by 32-bit microprocessor control CPLD module and obtains, often complete the sampling of a point, hyperchannel 16 A/D converters all can export one and convert signal, this signal is input to 32-bit microprocessor, as look-at-me, for 32-bit microprocessor provides the reading sequential of sampled data.Meanwhile, 16 data lines of hyperchannel 16 A/D converter parallel outputs also send 16 bit digital be converted to 32-bit microprocessor.Microprocessor carries out digital independent according to reading sequential, completes A/D sampling process.
32-bit microprocessor and CPLD model calling, control CPLD module exports two-way frequency signal, one tunnel is A/D sampling time sequence signal, and another road is then standard electric energy impulse output signal, and standard electric energy impulse output signal outputs to standard electric energy impulse lead-out terminal through optical coupling isolation circuit.Be input to 32-bit microprocessor from the tested table electrical energy pulse of tested table Puled input terminal input two-way through light-coupled isolation module, with standard electric energy impulse comparison, carry out error calculation.
The advantage of the utility model patent mainly contains:
One is A/D converter is a slice successive approximation 16 A/D conversion chips, and at input simulating signal, output digit signals in single-chip microcomputer process, its bit error rate is extremely low.
Two is that discharge circuit adopts 1/2/4/8 times of program control amplifier, can improve the resolution of simulating signal in real time, also can improve sampling precision.
The utility model is owing to have employed above technical scheme, there is significant technique effect: adopt between mimic channel and digital circuit and modulus buffer circuit is set, temperature compensation module is increased by signal input part, make system have stronger antijamming capability and higher reliability, also substantially increase the measuring accuracy of system.
Accompanying drawing explanation
Fig. 1 is the system principle diagram of the utility model three-phase electric energy meter on-site check system embodiment.
The toponym that in accompanying drawing, each number designation refers to is as follows: 1-digital units, 2-modulus isolation module, 3-analogue unit, 11-industrial control board, 12-liquid crystal touch screen, 13-microprocessor, 14-blue tooth wireless communication module, 15-light-coupled isolation module, 16-CPLD module, 31-A/D converter, 32-resistor voltage divider circuit, 33-three-phase voltage load module, 34-temperature compensation module, 35-three-phase current load module, 36-current switch circuit, 37-active compensation sampling module, the program control amplifier module of 38-, 111-AccessPort mouth, 112-network interface, 113-USB interface, 151-tested table Puled input terminal, 152-standard electric energy impulse lead-out terminal, 153-485 meter reading communication port, 331-A phase voltage input terminal, 332-B phase voltage input terminal, 333-C phase voltage input terminal, 351-A phase current load module, 352-B phase current load module, 353-C phase current load module, 3511-A phase terminal current transformer, 3512-A phase split-core type meter, 3521-B phase terminal current transformer, 3522-B phase split-core type meter, 3531-C phase terminal current transformer, 3532-C phase split-core type meter.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
Embodiment 1
A kind of three-phase electric energy meter on-site check system, as shown in Figure 1, comprise the analogue unit (3) be located on mimic channel, the digital units 1 be located in digital circuit, also comprise the modulus isolation module 2 be connected between analogue unit 3 and digital units 1, modulus isolation module 2 pairs of signals transmitted between mimic channel and digital circuit carry out isolated from power.
Mimic channel comprises three-phase voltage input circuit, three-phase current input circuit and temperature sample input circuit three part.
Analogue unit 3 comprises three-phase voltage load module 33, three-phase current load module 35, active compensation sampling module 37, program control amplifier module 38, A/D converter 31, modulus isolation module 2 respectively with A/D converter 31, program control amplifier module 38 connects, be connected by resistor voltage divider circuit 32 between three-phase voltage load module 33 with A/D converter 31, be connected by current switch circuit 36 between three-phase current load module 35 with active compensation sampling module 37, be connected by current switch circuit 36 between three-phase current load module 35 with modulus isolation module 2, active compensation sampling module 37, program control amplifier module 38, A/D converter 31 connects successively,
Three-phase voltage inputs from three-phase voltage load module 33, enters A/D converter 31 carry out analog to digital conversion through resistor voltage divider circuit 32; Three-phase current inputs from three-phase current load module 35, active compensation sampling module 37, program control amplifier module 38 is flowed through successively through current switch circuit 36, enter A/D converter 31 and carry out analog to digital conversion, the current signal of active compensation sampling module 37 to input compensates and samples, and the current signal of program control amplifier module 38 to input carries out programming amplifying.
Analogue unit 3 also comprises temperature compensation module 34, and temperature compensation module 34 is connected with A/D converter 31, and temperature compensation module 34 is for temperature sampling, and temperature sampled signal enters A/D converter 31 and carries out analog to digital conversion.
Temperature compensation module 34 mainly completes and samples the temperature of instrument internal, converts the 7th passage that small voltage signal is input to hyperchannel 16 bit A/D converter 31 to and carries out analog to digital conversion.
Digital units 1 comprises microprocessor 13, blue tooth wireless communication module 14, industrial control board 11, liquid crystal touch screen 12, CPLD module 16, light-coupled isolation module 15, light-coupled isolation module 15 is provided with tested table Puled input terminal 151, standard electric energy impulse lead-out terminal 152, modulus isolation module 2 respectively with microprocessor 13, CPLD module 16 connects, microprocessor 13 respectively with industrial control board 11, blue tooth wireless communication module 14, CPLD module 16, light-coupled isolation module 15 connects, light-coupled isolation module 15 respectively with industrial control board 11, CPLD module 16 connects, industrial control board 11 is connected with liquid crystal touch screen 12, microprocessor 13 controls blue tooth wireless communication module 14 and carries out wireless telecommunications with handheld terminal, liquid crystal touch screen 12 is for data display and touch signal input, and the data that industrial control board 11 controls liquid crystal touch screen 12 export,
Microprocessor 13 control CPLD module 16 exports two-way frequency signal, one tunnel exports sampling time sequence signal and enters modulus isolation module 2, another road outputting standard electrical energy impulse signals, standard electrical energy impulse signals outputs to standard electric energy impulse lead-out terminal 152 through light-coupled isolation module 15; Input electrical energy pulse from tested table Puled input terminal 151, enter microprocessor 13 through light-coupled isolation module 15 and carry out error calculation.
Three-phase voltage load module 33 comprises A phase voltage input terminal 331 that parallel input arranges, B phase voltage input terminal 332, C phase voltage input terminal 333, A phase voltage input terminal 331, B phase voltage input terminal 332, C phase voltage input terminal 333 connect respectively and access resistor voltage divider circuit 32.
Three-phase current load module 35 comprises A phase current load module 351 that parallel input arranges, B phase current load module 352, C phase current load module 353, A phase current load module 351, B phase current load module 352, C phase current load module 353 connect respectively and access current switch circuit 36.
A phase current load module 351 comprises A phase terminal current transformer 3511, the A phase split-core type meter 3512 that parallel input is arranged, B phase current load module 352 comprises B phase terminal current transformer 3521 that parallel input arranges, B phase split-core type meter 3522, C phase current load module 353 comprises C phase terminal current transformer 3531, the C phase split-core type meter 3532 that parallel input is arranged.
The input of three-phase current then has two kinds of modes, a kind of mode is that three-phase current is input to inner A phase terminal current transformer 3511, B phase terminal current transformer 3521 and C phase terminal current transformer 3531 respectively from the current terminal of six terminal panel, obtains three-phase current small-signal and is input to respective current switch circuit 36 more respectively.Another kind of mode is by three split core type current transformers, i.e. A phase split-core type meter 3512, B phase split-core type meter 3522 and C phase split-core type meter 3532.After obtaining three-phase current small-signal, then be input to current switch circuit 36 from the split-core type meter terminal of three terminal panel.32-bit microprocessor 13 in digital circuit exports control signal and carries out alternative control to current switch circuit 36.The road Small Current Signal chosen is input to active compensation sampling module 37 and compensates and sample.Obtain three road small voltage signals and be input to respective program control amplifier module 38 again, programming amplifying is carried out to signal.Enlargement factor is also export control signal by 32-bit microprocessor 13 to control.Another three passages that the output signal of three program control amplifier modules 38 is all input to hyperchannel 16 A/D converters 31 carry out analog to digital conversion.
Industrial control board 11 is provided with network interface 112, usb 1 13, AccessPort mouth 111, network interface 112 is expanded for program debug and communication, usb 1 13 is derived and program upgrade for checking data, and AccessPort mouth 111 is for program debug and data monitoring.
Light-coupled isolation module 15 is also provided with 485 meter reading communication ports 153 of the measurement data for reading tested table.
In a word, the foregoing is only preferred embodiment of the present utility model, all equalizations done according to the utility model claim change and modify, and all should belong to the covering scope of the utility model patent.
Claims (9)
1. a three-phase electric energy meter on-site check system, comprise the analogue unit (3) be located on mimic channel, the digital units (1) be located in digital circuit, it is characterized in that: also comprise the modulus isolation module (2) be connected between analogue unit (3) and digital units (1), modulus isolation module (2) carries out isolated from power to the signal transmitted between mimic channel and digital circuit.
2. a kind of three-phase electric energy meter on-site check system according to claim 1, it is characterized in that: analogue unit (3) comprises three-phase voltage load module (33), three-phase current load module (35), active compensation sampling module (37), program control amplifier module (38), A/D converter (31), modulus isolation module (2) respectively with A/D converter (31), program control amplifier module (38) connects, be connected by resistor voltage divider circuit (32) between three-phase voltage load module (33) with A/D converter (31), be connected by current switch circuit (36) between three-phase current load module (35) with active compensation sampling module (37), be connected by current switch circuit (36) between three-phase current load module (35) with modulus isolation module (2), active compensation sampling module (37), program control amplifier module (38), A/D converter (31) connects successively,
Three-phase voltage, from three-phase voltage load module (33) input, enters A/D converter (31) through resistor voltage divider circuit (32) and carries out analog to digital conversion; Three-phase current inputs from three-phase current load module (35), active compensation sampling module (37), program control amplifier module (38) is flowed through successively through current switch circuit (36), enter A/D converter (31) and carry out analog to digital conversion, the current signal of active compensation sampling module (37) to input compensates and samples, and the current signal of program control amplifier module (38) to input carries out programming amplifying.
3. a kind of three-phase electric energy meter on-site check system according to claim 1 and 2, it is characterized in that: analogue unit (3) also comprises temperature compensation module (34), temperature compensation module (34) is connected with A/D converter (31), temperature compensation module (34) is for temperature sampling, and temperature sampled signal enters A/D converter (31) and carries out analog to digital conversion.
4. a kind of three-phase electric energy meter on-site check system according to claim 1, is characterized in that: digital units (1) comprises microprocessor (13), blue tooth wireless communication module (14), industrial control board (11), liquid crystal touch screen (12), CPLD module (16), light-coupled isolation module (15), light-coupled isolation module (15) is provided with tested table Puled input terminal (151), standard electric energy impulse lead-out terminal (152), modulus isolation module (2) respectively with microprocessor (13), CPLD module (16) connect, microprocessor (13) respectively with industrial control board (11), blue tooth wireless communication module (14), CPLD module (16), light-coupled isolation module (15) connect, light-coupled isolation module (15) respectively with industrial control board (11), CPLD module (16) connects, and industrial control board (11) is connected with liquid crystal touch screen (12), and microprocessor (13) controls blue tooth wireless communication module (14) and carries out wireless telecommunications with handheld terminal, liquid crystal touch screen (12) is for data display and touch signal input, and the data that industrial control board (11) controls liquid crystal touch screen (12) export,
Microprocessor (13) control CPLD module (16) exports two-way frequency signal, one tunnel exports sampling time sequence signal and enters modulus isolation module (2), another road outputting standard electrical energy impulse signals, standard electrical energy impulse signals outputs to standard electric energy impulse lead-out terminal (152) through light-coupled isolation module (15); From tested table Puled input terminal (151) input electrical energy pulse, enter microprocessor (13) through light-coupled isolation module (15) and carry out error calculation.
5. a kind of three-phase electric energy meter on-site check system according to claim 2, it is characterized in that: three-phase voltage load module (33) comprises A phase voltage input terminal (331), B phase voltage input terminal (332), the C phase voltage input terminal (333) that parallel input is arranged, and A phase voltage input terminal (331), B phase voltage input terminal (332), C phase voltage input terminal (333) connect access resistor voltage divider circuit (32) respectively.
6. a kind of three-phase electric energy meter on-site check system according to claim 2, it is characterized in that: three-phase current load module (35) comprises A phase current load module (351), B phase current load module (352), the C phase current load module (353) that parallel input is arranged, and A phase current load module (351), B phase current load module (352), C phase current load module (353) connect access current switch circuit (36) respectively.
7. a kind of three-phase electric energy meter on-site check system according to claim 6, it is characterized in that: A phase current load module (351) comprises A phase terminal current transformer (3511), the A phase split-core type meter (3512) that parallel input is arranged, B phase current load module (352) comprises B phase terminal current transformer (3521), the B phase split-core type meter (3522) that parallel input is arranged, and C phase current load module (353) comprises C phase terminal current transformer (3531), the C phase split-core type meter (3532) that parallel input is arranged.
8. a kind of three-phase electric energy meter on-site check system according to claim 4, it is characterized in that: industrial control board (11) is provided with network interface (112), USB interface (113), AccessPort mouth (111), network interface (112) is expanded for program debug and communication, USB interface (113) derives and program upgrade for checking data, and AccessPort mouth (111) is for program debug and data monitoring.
9. a kind of three-phase electric energy meter on-site check system according to claim 4, is characterized in that: the 485 meter reading communication ports (153) light-coupled isolation module (15) being also provided with the measurement data for reading tested table.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520468514.XU CN204855783U (en) | 2015-06-24 | 2015-06-24 | On --spot check system of three -phase electric energy meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520468514.XU CN204855783U (en) | 2015-06-24 | 2015-06-24 | On --spot check system of three -phase electric energy meter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105005016A (en) * | 2015-07-06 | 2015-10-28 | 浙江涵普电力科技有限公司 | Field verification system and field verification method for three-phase electric energy meter |
| CN107315156A (en) * | 2017-08-09 | 2017-11-03 | 浙江涵普电力科技有限公司 | High-accuracy direct current standard electric energy meter |
| CN113138362A (en) * | 2021-05-11 | 2021-07-20 | 深圳市先行电气技术有限公司 | Calibration method for automatically compensating electric energy metering error of electric energy meter |
-
2015
- 2015-06-24 CN CN201520468514.XU patent/CN204855783U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105005016A (en) * | 2015-07-06 | 2015-10-28 | 浙江涵普电力科技有限公司 | Field verification system and field verification method for three-phase electric energy meter |
| CN105005016B (en) * | 2015-07-06 | 2018-06-29 | 浙江涵普电力科技有限公司 | A kind of three-phase electric energy meter on-site check system and its method |
| CN107315156A (en) * | 2017-08-09 | 2017-11-03 | 浙江涵普电力科技有限公司 | High-accuracy direct current standard electric energy meter |
| CN107315156B (en) * | 2017-08-09 | 2024-04-16 | 浙江涵普电力科技有限公司 | High-precision direct-current standard electric energy meter |
| CN113138362A (en) * | 2021-05-11 | 2021-07-20 | 深圳市先行电气技术有限公司 | Calibration method for automatically compensating electric energy metering error of electric energy meter |
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