CN110082700A - A kind of electric energy meter measurement error on-line monitoring circuit and method based on CT sampling - Google Patents
A kind of electric energy meter measurement error on-line monitoring circuit and method based on CT sampling Download PDFInfo
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- CN110082700A CN110082700A CN201910393961.6A CN201910393961A CN110082700A CN 110082700 A CN110082700 A CN 110082700A CN 201910393961 A CN201910393961 A CN 201910393961A CN 110082700 A CN110082700 A CN 110082700A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
Abstract
The present invention relates to a kind of electric energy meter measurement errors based on CT sampling to monitor circuit on-line, it is characterised in that: by three current transformers, ac current source, three programmable gain amplifiers, three analog-digital converters, three high-pass filters of low-pass filter 2, three of low-pass filter 1, three and error monitoring module composition；The invention further relates to a kind of electric energy meter measurement error on-line monitoring methods based on CT sampling.The design of the invention is scientific and reasonable, has many advantages, such as to improve detection efficiency, use manpower and material resources sparingly, accurate measurement and reliable and stable, is a kind of electric energy meter measurement error on-line monitoring circuit and method based on CT sampling with higher innovation.
Description
Technical field
The invention belongs to Intelligent electric-energy metering fields, are related to a kind of on-line monitoring method of electric energy meter measurement error, especially
It is a kind of electric energy meter measurement error on-line monitoring circuit and method based on CT sampling.
Background technique
The accuracy and reliability of electrical energy measurement is the basis of grid company business revenue clearing, maintains entire electricity market order
The stabilization of sequence, while being also the production of power industry tissue, the important evidence for formulating decision.Conversely speaking, to electric energy metering device
Error administer not as not only resulting in generation clearing deviation and cause direct economic loss, can also be lost with enterprise one by one
The generation of letter event reduces the credit of power grid enterprises indirectly, or even influences corporate image.Currently, the metering accuracy of electric energy meter
Need to patrol artificial blanket type or sampling observation by way of maintained, huge not only for the not strong workload of property, it is even more impossible to timely
Reflect the distribution situation of overall operation error.In order to solve the above problem, the present invention proposes a kind of electric energy meter based on CT sampling
Error on-line monitoring method is measured, the angle perfect from high current three-phase electric energy meter own functionality solves electric energy metering error
The imeliness problem of monitoring.
At present there are two types of country's electric energy meter load current sample modes: current divider resistance sampling and current transformer sample.
In the case where carrying out proper calibration to ammeter, the key factor for influencing measurement accuracy and stability is the device of sample circuit selection
Temperature variations inside part index, mainly temperature stability index and ammeter, it is evident that use current divider current sample
When, with the disposition of the number of number of users and the size of load current and wire joining inside ammeter, can all influence
Temperature change inside ammeter, it is single that temperature change influence measurement situation is seen in the case where selecting identical index component, mutually
Sensor sampling class ammeter has a clear superiority.Mutual inductor sample electric energy meter increases level-one isolation, makes due to using mutual inductor
Hi-lo circuit separates, and reduces influence of the external signal to acquisition signal and measuring circuit.With the use of multi-functional electric energy
Chip circuit is measured, high accuracy ammeter is readily produced.The higher ammeter of country's precision, sample circuit mostly use greatly mutual inductance at present
Device sample circuit.The characteristics of mutual inductor sample secondary current is small, no fever phenomenon, but also such electric energy meter is more suitable for being mostly used
Family, high current application scenarios.
In conclusion the on-line monitoring of electric energy meter measurement error loses promotion stoichiometric level, reduction clearing, maintains market
Order, promotion corporate image all have significance.Currently, electric energy meter measurement error on-line monitoring is still in the experimental study stage
Not yet have the condition to put it into commercial operation, needs the error for proposing to be suitable for high current three-phase electric energy meter on-line monitoring solution.
By the retrieval to patent document, patent document identical with present patent application is not found.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of designs rationally, accurate measurement and stabilization can
The electric energy meter measurement error on-line monitoring circuit and method based on CT sampling leaned on.
The present invention solves its technical problem and adopts the following technical solutions to achieve:
A kind of electric energy meter measurement error on-line monitoring circuit based on CT sampling, it is characterised in that: by three Current Mutual Inductances
Device, ac current source, three programmable gain amplifiers, three analog-digital converters, three low-pass filters, 1, three low pass filtered
2, three high-pass filters of wave device and error monitoring module composition,
The current transformer is used for phase current sampling, and three current transformers are each passed through 3 phase lines, and common
Across the cable of a test signal generation circuit, secondary side series connection certain value resistance, for turning mutual inductor secondary current
It is changed to voltage；
Reference current signal needed for the ac current source is used to provide error on-line monitoring, with a fixed value resistance
Series connection forming circuit, the circuit are signal generating circuit described in current transformer, in the circuit connection ac current source with
The cable of fixed value resistance passes through three current transformers, separately has digital signal output to be all the way connected to the corresponding of error sensing module
Input terminal；
The programmable gain amplifier is used for signal caused by update the system and decays, three programmable automation controllers
Device is arranged in three phase current Acquisition Circuits, and is parallel to the definite value electricity of three Current Transformer Secondary side concatenations respectively
Hinder both ends；
The analog current signal that the analog-digital converter is used to obtain separating flow sampling is converted to digital signal, and this three
Analog-digital converter is arranged in three phase current Acquisition Circuits, and each input terminal of three analog-digital converters is all connected to accordingly
Each output end of the output end of programmable gain amplifier, three analog-digital converters is connected to the input of corresponding low-pass filter
End, three analog-digital converters are provided with reference voltage source；
The low-pass filter 1 is used for filter high-frequency noise signal, which is arranged in three
In phase current Acquisition Circuit, respective input terminal is connected to the output end of corresponding analog-digital converter, respective output end point
Two-way is connected to the input terminal of low-pass filter 2 for electrical energy measurement all the way, and another way is connected to the input terminal of high-pass filter
For error monitoring；
For extracting actual current measuring signal, which is arranged in the low-pass filter 2
In three phase current Acquisition Circuits, and it is connected between low-pass filter 1 and metering module；
The high-pass filter is respectively arranged for extracting error on-line monitoring test signal, three high-pass filters
In three phase current Acquisition Circuits, and it is connected between low-pass filter 1 and error sensing module；
The error monitoring module, for comparison reference signal and test signal, to generate error on-line monitoring alarm
Signal, two-way input terminal are connected to the digital signal output end of ac current source and the output end of analog-digital converter.
Moreover, the frequency of the ac current source is less than the cutoff frequency of low-pass filter 1 and is greater than high-pass filter
Cutoff frequency, will pass through filter separation test signal.
Moreover, the cutoff frequency of the low-pass filter 1 should be higher than that and as far as possible close to the frequency of the ac current source.
Moreover, the cutoff frequency of the low-pass filter 2 should be higher than that by the frequency of measuring three-phase current, and lower than described
The frequency of ac current source.
Moreover, the cutoff frequency of the high-pass filter should be higher than that by the frequency of measuring three-phase current, and lower than described
The frequency of ac current source.
A kind of electric energy meter measurement error on-line monitoring method based on CT sampling, it is characterised in that: including following method:
Step 1: ac current source starts so that test signal generating loop generates test electric current, three current transformers
Its secondary circuit is set to generate induced current respectively across the cable of test loop, and superimposed with metering phase current acquisition, through fixed
Value resistance ultimately forms three monitoring superposed signals for being superimposed test electric current；
Step 2: inputting programmable gain amplifier for superposed signal, according to secondary loop of mutual inductor fixed value resistance
Resistance value amplify presupposition multiple, keep it numerically equal with the electric current of secondary circuit, to meet the needs of normal electrical energy measurement；
Step 3: amplified superposed signal input analog-to-digital converter is converted into digital signal；
Step 4: superposed signal is inputted into low-pass filter 1, removes HF noise signal；
Step 5: the superposed signal after removal noise is inputted into high-pass filter, removal phase current acquires signal, extracts
The induced current of test loop；
Step 6: being separately input to error monitoring module for three induced currents of test loop, in the module, according to
Three sensor current signals are amplified corresponding multiple by the no-load voltage ratio of current transformer, and poor with reference current signal work respectively, take three
Maximum absolute value person is error criterion in a difference；
Step 7: in error monitoring module, whether error in judgement criterion is greater than preset value, and if it is output error is big
Alarm signal continues step 6 after otherwise postponing the preset time.
The advantages and positive effects of the present invention are:
1. the electric energy meter measurement error on-line monitoring circuit and method, this method based on CT sampling have effectively achieved family
Function is monitored on-line with the error of single-phase electric energy meter, is saved the manpower and material resources put into needed for electric energy meter error detection work, is mentioned
High detection efficiency.
2. not influencing the normal meter of electric energy meter based on the electric energy meter measurement error on-line monitoring circuit and method of CT sampling
Function is measured, error monitoring process sustainable operation improves the frequency of electric energy meter error detection.
3. the design of the invention is scientific and reasonable, has and improve detection efficiency, use manpower and material resources sparingly, accurate measurement and reliable and stable
The advantages that, it is a kind of electric energy meter measurement error on-line monitoring circuit and method based on CT sampling with higher innovation.
Detailed description of the invention
Fig. 1 is the circuit diagram of present invention on-line monitoring circuit；
Fig. 2 is the method flow diagram of on-line monitoring method of the present invention.
Specific embodiment
The embodiment of the present invention is further described below in conjunction with attached drawing:
A kind of electric energy meter measurement error on-line monitoring circuit based on CT sampling, innovation are: by three electric currents
Mutual inductor, ac current source, three programmable gain amplifiers, three analog-digital converters, three low-pass filter 1, three it is low
2, three high-pass filters of bandpass filter and error monitoring module composition,
The Current Transmit is used for phase current sampling, and three current transformers are each passed through 3 phase lines, and altogether
With the cable for passing through a test signal generation circuit, secondary side series connection certain value resistance is used for mutual inductor secondary current
Be converted to voltage；The model HD-001T of the current transformer, is produced by Hebei Shenke Electronics Co., Ltd.
Reference current signal needed for the ac current source is used to provide error on-line monitoring, with a fixed value resistance
Series connection forming circuit, the circuit are signal generating circuit described in current transformer, in the circuit connection ac current source with
The cable of fixed value resistance passes through three current transformers, separately has digital signal output to be all the way connected to the corresponding of error sensing module
Input terminal；The model LTC6995-1 of the ac current source, is produced by Analog company.
The programmable gain amplifier PGA is used for signal caused by update the system and decays, three programmable-gains
Amplifier is arranged in three phase current Acquisition Circuits, and is parallel to determining for three Current Transformer Secondary side concatenations respectively
It is worth resistance both ends；The model LTC6910-1 of the PGA, is produced by Analog company.
The analog current signal that the analog-digital converter ADC is used to obtain separating flow sampling is converted to digital signal, should
Three analog-digital converters are arranged in three phase current Acquisition Circuits, and each input terminal of three analog-digital converters is all connected to
The output end of corresponding programmable gain amplifier, each output end of three analog-digital converters are connected to the defeated of corresponding low-pass filter
Enter end, three analog-digital converters are provided with reference voltage source；The model AD7791 of the ADC, is produced by Analog company.
The low-pass filter 1 is used for filter high-frequency noise signal, which is arranged in three
In phase current Acquisition Circuit, respective input terminal is connected to the output end of corresponding analog-digital converter, respective output end point
Two-way is connected to the input terminal of low-pass filter 2 for electrical energy measurement all the way, and another way is connected to the input terminal of high-pass filter
For error monitoring；The model LTC1069-1 of the low-pass filter 1, is produced by Analog company.
For extracting actual current measuring signal, which is arranged in the low-pass filter 2
In three phase current Acquisition Circuits, and it is connected between low-pass filter 1 and metering module；The type of the low-pass filter 2
Number be LTC1062, produced by Analog company.
The high-pass filter is respectively arranged for extracting error on-line monitoring test signal, three high-pass filters
In three phase current Acquisition Circuits, and it is connected between low-pass filter 1 and error sensing module；The high-pass filter
Model LTC1069-1, produced by Analog company.
The error monitoring module, for comparison reference signal and test signal, to generate error on-line monitoring alarm
Signal, two-way input terminal are connected to the digital signal output end of ac current source and the output end of analog-digital converter.
The frequency of the ac current source is less than the cutoff frequency of low-pass filter 1 and is greater than the cutoff frequency of high-pass filter
Rate, will pass through filter separation test signal.
The cutoff frequency of the low-pass filter 1 should be higher than that and as far as possible close to the frequency of the ac current source.
The cutoff frequency of the low-pass filter 2 is higher than by the frequency of measuring three-phase current, and is lower than the alternating current
The frequency in stream source.
The cutoff frequency of the high-pass filter should be higher than that by the frequency of measuring three-phase current, and be lower than the alternating current
The frequency in stream source.
A kind of electric energy meter measurement error on-line monitoring method based on CT sampling, innovation are: including such as lower section
Method:
Step 1: ac current source starts so that test signal generating loop generates test electric current, three current transformers
Its secondary circuit is set to generate induced current respectively across the cable of test loop, and superimposed with metering phase current acquisition, through fixed
Value resistance ultimately forms three monitoring superposed signals for being superimposed test electric current；
Step 2: inputting programmable gain amplifier for superposed signal, according to secondary loop of mutual inductor fixed value resistance
Resistance value amplify presupposition multiple, keep it numerically equal with the electric current of secondary circuit, to meet the needs of normal electrical energy measurement；
Step 3: amplified superposed signal input analog-to-digital converter is converted into digital signal；
Step 4: superposed signal is inputted into low-pass filter 1, removes HF noise signal；
Step 5: the superposed signal after removal noise is inputted into high-pass filter, removal phase current acquires signal, extracts
The induced current of test loop；
Step 6: being separately input to error monitoring module for three induced currents of test loop, in the module, according to
Three sensor current signals are amplified corresponding multiple by the no-load voltage ratio of current transformer, and poor with reference current signal work respectively, take three
Maximum absolute value person is error criterion in a difference；
Step 7: in error monitoring module, whether error in judgement criterion is greater than preset value, and if it is output error is big
Alarm signal continues step 6 after otherwise postponing the preset time.
Although disclosing the embodiment of the present invention and attached drawing for the purpose of illustration, those skilled in the art can be managed
Solution: do not departing from the present invention and spirit and scope of the appended claims in, various substitutions, changes and modifications be all it is possible,
Therefore, the scope of the present invention is not limited to the embodiment and attached drawing disclosure of that.
Claims (6)
1. it is a kind of based on CT sampling electric energy meter measurement error monitor on-line circuit, it is characterised in that: by three current transformers,
Ac current source, three programmable gain amplifiers, three analog-digital converters, three low-pass filters, 1, three low-pass filter
2, three high-pass filters and error monitoring module composition,
The current transformer is used for phase current sampling, and three current transformers are each passed through 3 phase lines, and pass through jointly
The cable of one test signal generation circuit, secondary side series connection certain value resistance, for being converted to mutual inductor secondary current
Voltage；
Reference current signal needed for the ac current source is used to provide error on-line monitoring, connects with a fixed value resistance
Forming circuit, the circuit are signal generating circuit described in current transformer, connect ac current source and definite value in the circuit
The cable of resistance passes through three current transformers, separately has digital signal output to be all the way connected to the corresponding input of error sensing module
End；
The programmable gain amplifier is used for signal caused by update the system and decays, three programmable gain amplifiers point
It is not arranged in three phase current Acquisition Circuits, and is parallel to the fixed value resistance two of three Current Transformer Secondary sides concatenation respectively
End；
The analog current signal that the analog-digital converter is used to obtain separating flow sampling is converted to digital signal, three moduluses
Converter is arranged in three phase current Acquisition Circuits, and each input terminal of three analog-digital converters is all connected to accordingly compile
The output end of journey gain amplifier, each output end of three analog-digital converters are connected to the input terminal of corresponding low-pass filter, and three
A analog-digital converter is provided with reference voltage source；
The low-pass filter 1 is used for filter high-frequency noise signal, which is arranged in three mutually electricity
It flowing in Acquisition Circuit, respective input terminal is connected to the output end of corresponding analog-digital converter, and respective output end divides two-way,
It is connected to the input terminal of low-pass filter 2 all the way for electrical energy measurement, the input terminal that another way is connected to high-pass filter is used for
Error monitoring；
For the low-pass filter 2 for extracting actual current measuring signal, which is arranged in three
In phase current Acquisition Circuit, and it is connected between low-pass filter 1 and metering module；
The high-pass filter is arranged in three for extracting error on-line monitoring test signal, three high-pass filters
In a phase current Acquisition Circuit, and it is connected between low-pass filter 1 and error sensing module；
The error monitoring module, for comparison reference signal and test signal, to generate error on-line monitoring alarm signal,
Its two-way input terminal is connected to the digital signal output end of ac current source and the output end of analog-digital converter.
2. a kind of electric energy meter measurement error based on CT sampling according to claim 1 monitors circuit on-line, feature exists
In: the frequency of the ac current source is less than the cutoff frequency of low-pass filter 1 and is greater than the cutoff frequency of high-pass filter, with
It will pass through filter separation test signal.
3. a kind of electric energy meter measurement error based on CT sampling according to claim 1 monitors circuit on-line, feature exists
In: the cutoff frequency of the low-pass filter 1 should be higher than that and as far as possible close to the frequency of the ac current source.
4. a kind of electric energy meter measurement error based on CT sampling according to claim 1 monitors circuit on-line, feature exists
In: the cutoff frequency of the low-pass filter 2 should be higher than that by the frequency of measuring three-phase current, and be lower than the ac current source
Frequency.
5. a kind of electric energy meter measurement error based on CT sampling according to claim 1 monitors circuit on-line, feature exists
In: the cutoff frequency of the high-pass filter should be higher than that by the frequency of measuring three-phase current, and be lower than the ac current source
Frequency.
6. a kind of electric energy meter measurement error on-line monitoring method according to claim 1 based on CT sampling, feature exist
In: including following method:
Step 1: ac current source starts so that test signal generating loop generates test electric current, and three current transformers pass through
The cable of test loop makes its secondary circuit generate induced current respectively, and superimposed with metering phase current acquisition, through definite value electricity
Resistance ultimately forms three monitoring superposed signals for being superimposed test electric current；
Step 2: inputting programmable gain amplifier for superposed signal, according to the resistance of secondary loop of mutual inductor fixed value resistance
Value amplification presupposition multiple, keeps it numerically equal with the electric current of secondary circuit, to meet the needs of normal electrical energy measurement；
Step 3: amplified superposed signal input analog-to-digital converter is converted into digital signal；
Step 4: superposed signal is inputted into low-pass filter 1, removes HF noise signal；
Step 5: the superposed signal after removal noise is inputted into high-pass filter, removal phase current acquires signal, extracts test
The induced current in circuit；
Step 6: three induced currents of test loop are separately input to error monitoring module, in the module, according to electric current
Three sensor current signals are amplified corresponding multiple by the no-load voltage ratio of mutual inductor, and poor with reference current signal work respectively, take three differences
Maximum absolute value person is error criterion in value；
Step 7: in error monitoring module, whether error in judgement criterion is greater than preset value, if it is the big alarm of output error
Signal continues step 6 after otherwise postponing the preset time.
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Cited By (5)
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| CN111650434A (en) * | 2019-12-26 | 2020-09-11 | 北京博纳电气股份有限公司 | Method for single-phase intelligent electric energy meter to measure by adopting PCB type current sensor |
| CN112834798A (en) * | 2020-12-21 | 2021-05-25 | 深圳供电局有限公司 | Transformation ratio testing method, transformation ratio testing device, testing equipment and storage medium |
| WO2021127361A1 (en) * | 2019-12-19 | 2021-06-24 | Landis+Gyr Technologies, Inc. | Gating energy consumption accumulation by detecting a fundamental component of a current |
| CN113156186A (en) * | 2021-04-23 | 2021-07-23 | 易事特集团(河南)有限公司 | Pulse current sampling circuit based on CT sampling |
| CN117572178A (en) * | 2024-01-12 | 2024-02-20 | 沈阳圣祥科技有限公司 | 35-500kv oil immersed current transformer detection system |
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| CN113156186B (en) * | 2021-04-23 | 2023-10-10 | 易事特储能科技有限公司 | Pulse current sampling circuit based on CT sampling |
| CN117572178A (en) * | 2024-01-12 | 2024-02-20 | 沈阳圣祥科技有限公司 | 35-500kv oil immersed current transformer detection system |
| CN117572178B (en) * | 2024-01-12 | 2024-03-22 | 沈阳圣祥科技有限公司 | 35-500kv oil immersed current transformer detection system |
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Application publication date: 20190802 |