CN208110026U - A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system - Google Patents
A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system Download PDFInfo
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- CN208110026U CN208110026U CN201820623891.XU CN201820623891U CN208110026U CN 208110026 U CN208110026 U CN 208110026U CN 201820623891 U CN201820623891 U CN 201820623891U CN 208110026 U CN208110026 U CN 208110026U
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Abstract
The utility model discloses a kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring systems, including critical saturation current measuring unit, supersaturated characteristic processing unit, critical saturation current measuring unit, including current source, adjustable resistance, critical saturation current measuring circuit, current source passes through the tested current transformer signal input part with critical saturation current measuring circuit respectively, adjustable resistance is connected, current source is also directly connected to critical saturation current measuring circuit, adjustable resistance is also connected with the adjusting output end of critical saturation current measuring circuit, saturated characteristic processing unit, including MCU processor, display screen, RS232 telecommunication circuit.Critical saturation current of the utility model by measurement current transform er under nominal secondary load, the saturated characteristic parameter of electrical energy meter electricity current transformer is calculated, and by display and communication output, it is the foundation of the anti-impact of the overcurrent in short-term design of electric energy meter, has a good application prospect.
Description
Technical field
The utility model relates to a kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring systems, belong to electronic surveying
Technical field.
Background technique
Electric energy meter needs to bear 20 times of nominal maximum current or more in the operation of scene as a kind of high-accuracy measuring equipment
Sort time overcurrent impact, the reliability that the design relation of the anti-impact of overcurrent in short-term is measured to electric energy meter, in electric energy meter designs
Need to obtain various alternative current transformers in different loads, the secondary output of current transformer when overcurrent is impacted in short-term
Parameter.
Currently, common processing mode is to remove the anti-conveyance capacity in short-term of verifying electric energy meter by overcurrent experiment, lack
Point is exactly to verify after design, time-consuming and laborious if change design parameter, needs to test repeatedly；Moreover, such test needs
A kind of sort time overcurrent that can accurately export 20 times of nominal maximum current or more, output electric current is big, Current Transformer Secondary device
There is the risk burnt and burst, measurement difficulty is high and safety is low；Finally, due to the lower primary current of sort time overcurrent and secondary current
It is non-linear, so needing the maximum for finding electric energy meter sampling circuit by testing repeatedly that can bear electricity in design of Reducing Rating
The intensity of stream, is inconvenient.
How to overcome the above problem, the anti-impact property of overcurrent in short-term of electric energy meter is tested, is that current urgent need solves
's.
Utility model content
The utility model aim is to overcome the anti-mistake in short-term for removing verifying electric energy meter by overcurrent experiment in the prior art
The problems of stream ability,.The electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system of the utility model, passes through survey
Critical saturation current of the current transformer under nominal secondary load is measured, according to electrical energy meter electricity current transformer supersaturation characteristic, meter
Calculation obtains the saturated characteristic parameter of electrical energy meter electricity current transformer, and by display and communication output, complete electric energy meter it is anti-in short-term
The test of overcurrent impact property, convenient test is at low cost, and security performance is high, has a good application prospect.
In order to achieve the above object, technical solution used by the utility model is：
A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system, including critical saturation current measuring unit,
Supersaturated characteristic processing unit,
The critical saturation current measuring unit, including current source, adjustable resistance, critical saturation current measuring circuit, institute
State current source by tested current transformer respectively with the signal input part of critical saturation current measuring circuit, adjustable resistance phase
Connection, the current source is also directly connected to critical saturation current measuring circuit, the adjustable resistance also with critical saturation current
The adjusting output end of measuring circuit is connected, and the critical saturation current measuring unit is as critical saturation current measuring unit
Interface end is connected with the interface end of supersaturated characteristic processing unit,
The saturated characteristic processing unit, including MCU processor, display screen, RS232 telecommunication circuit, the MCU processor
It is connected as the interface end of saturated characteristic processing unit with the interface end of critical saturation current measuring unit, the MCU processing
Device is also connected with display screen, RS232 telecommunication circuit respectively, and the RS232 telecommunication circuit is connected with test terminal.
A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system above-mentioned, the current source are output low noise
The current source of power frequency sine wave current signal.
A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system above-mentioned, the critical saturation current measurement
Circuit is AD sample circuit, built-in 24 bit AD sample chip.
A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system above-mentioned, the 24 bit AD sample chip
Model ADS1210 sampling A/D chip.
A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system above-mentioned, the critical saturation current measurement
It is connected between unit, supersaturated characteristic processing unit by SPI communication bus.
A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system above-mentioned, the resistance value of the adjustable resistance can
It adjusts, constitutes nominal resistance, adjustable resistance range is between 5 ohm to 1K ohm.
The utility model has the beneficial effects that：The electrical energy meter electricity current transformer supersaturation characterisitic parameter of the utility model measures
System, by critical saturation current of the measurement current transform er under nominal secondary load, according to electrical energy meter electricity current transformer mistake
The saturated characteristic parameter of electrical energy meter electricity current transformer is calculated in saturated characteristic, and is electric energy meter by display and communication output
The foundation of the anti-impact of overcurrent in short-term design, to realize the anti-impact property of the overcurrent in short-term test of electric energy meter, convenient test, cost
It is low, and security performance is high, has a good application prospect.
Detailed description of the invention
Fig. 1 is the system block diagram of the electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system of the utility model；
Fig. 2 is the flow chart of the electrical energy meter electricity current transformer supersaturation characterisitic parameter measurement method of the utility model；
When Fig. 3 is the saturation of the utility model the output electric current of current transformer by fall to zero schematic diagram.
Specific embodiment
Below in conjunction with Figure of description, the utility model is described further.Following embodiment is only used for more clear
Illustrate to Chu the technical solution of the utility model, and cannot be used as a limitation the limitation protection scope of the utility model.
As shown in Figure 1, the electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system of the utility model, including it is critical
Saturation current measuring unit, supersaturated characteristic processing unit,
The critical saturation current measuring unit, including current source, adjustable resistance, critical saturation current measuring circuit, institute
State current source by tested current transformer respectively with the signal input part of critical saturation current measuring circuit, adjustable resistance phase
Connection, the current source is also directly connected to critical saturation current measuring circuit, the adjustable resistance also with critical saturation current
The adjusting output end of measuring circuit is connected, and the critical saturation current measuring unit is as critical saturation current measuring unit
Interface end is connected with the interface end of supersaturated characteristic processing unit,
The saturated characteristic processing unit, including MCU processor, display screen, RS232 telecommunication circuit, the MCU processor
It is connected as the interface end of saturated characteristic processing unit with the interface end of critical saturation current measuring unit, the MCU processing
Device is also connected with display screen, RS232 telecommunication circuit respectively, and the RS232 telecommunication circuit is connected with test terminal.
Preferably, the current source is the current source of output low noise power frequency sine wave current signal, receives starting
Start the power frequency sine wave current signal of output low noise after signal, the current signal of output is gradually increased at any time, works as reception
Output current signal is reduced to zero after to stop signal.
Preferably, the critical saturation current measuring circuit be AD sample circuit, built-in 24 bit AD sample chip, described 24
The model ADS1210 sampling A/D chip of bit AD sample chip, for measuring the voltage signal at adjustable resistance both ends, and is converted
For the current value of the secondary output of tested current transformer.And by the zero crossing interval time of detection measuring signal, work as detection
It shortens to the interval time between signal zero-crossing, then it is assumed that saturated phenomenon occurs in tested current transformer, records tested letter
Number peak value and output.
Preferably, pass through SPI communication bus between the critical saturation current measuring unit, supersaturated characteristic processing unit
It is connected, traffic rate is fast, high reliablity.
Preferably, the resistance value of the adjustable resistance is adjustable, constitutes nominal resistance, and adjustable resistance range arrives the Europe 1K at 5 ohm
Between nurse.
According to above-mentioned electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system, the electrical energy meter electricity of the utility model
Current transformer supersaturation characterisitic parameter measurement method, as shown in Fig. 2, include the following steps,
Step (A) sends test starting order and test parameter by test terminal, supersaturated characteristic processing unit according to
The start command and test parameter received controls critical saturation current measuring unit and is actuated for current transformer supersaturation spy
Property parameter measurement；
The resistance value of adjustable resistance is adjusted to setting value by step (B), forms nominal resistance, and starting current source, current source
Electric current is exported to tested current transformer, current source output electric current is started from scratch linear increase at any time, is gradually increased to most
Big output valve；
Step (C), supersaturated characteristic processing circuit continuance test obtain the secondary current of tested current transformer output
The zero crossing of signal, and judge whether the zero crossing is saturated；If being saturated, the peak value of secondary current signal is recorded,
Stop the electric current output of current source, and executes step (D)；If current demand signal peak value is less than or equal to the peak value in last period and does not go out
It is now saturated, stops the electric current output of current source, increase adjustable resistance setting value, and execute step (B)；If current demand signal peak value is big
In the last period peak value and be not saturated, execute step (C)；
Wherein, judge whether the zero crossing is saturated, when being the core saturation according to current transformer, current transformer
Output electric current will fall to zero realization, as shown in figure 3, decline process is rapid and the time is extremely short, pass through sensed current signal
Waveform whether shift to an earlier date zero passage, if zero passage in advance, and CT saturation；
Step (D), MCU processor receive current source and stop current signal of the electric current output positioned at saturation when, and according to electricity
Energy table current transformer supersaturation characteristic, is calculated the saturated characteristic parameter of electrical energy meter electricity current transformer, wherein electrical energy meter electricity
Current transformer supersaturation characteristic is the approximate pure resistance characteristic of secondary load, and the saturated characteristic ginseng of electrical energy meter electricity current transformer is calculated
Number, includes the following steps,
(D1), due to the approximate pure resistance of the secondary load of electrical energy meter electricity current transformer, then secondary current and induced electromotive force at
Direct ratio, then the magnetic flux Φ of current transformer is the integral of secondary current, is shown below：
φ=(1/N2)∫e2Dt=(R/N2)∫I2dt
Wherein, N2For secondary the number of turns, e2It is secondary impedance, I for induced electromotive force, R2For secondary current；
(D2), when phase is from 0 degree to 180 degree definite integral, the current transformer magnetic flux of acquisition is saturation flux Φ max, electricity
Current transformer is in critical saturation state, is shown below：
Wherein, current source increase primary current time between zero crossing occurs in the output of secondary current shortens, then once
Electric current is that critical saturation current virtual value is I1pumn, the peak I of corresponding secondary current2pun；
(D3), since the saturation flux Φ max of current transformer is immutable, under critical saturation, secondary impedance R and I2punAt
Inverse ratio, when secondary impedance is adjusted to R from Rde, secondary current peak value I under corresponding critical saturation2pu, it is shown below：
I2pu=R/Rde*I2pun
(D4), the electric energy meter sort time overcurrent virtual value to be met is I1maxm, peak value I1max, can not based on saturation flux
The characteristic of change obtains phase x when saturation, is shown below：
Wherein, phase when x is saturation indicates that when primary current be I1max, the core saturation when phase is x or 180+x,
And secondary current output is zero；
(D5), phase x when according to saturation, calculate during the virtual value, peak value, unsaturation of secondary current virtual value and
It the unsaturation time, is shown below：
The peak I of secondary current2mFor
I2m=I1max/N2sinx；
The virtual value I of secondary current2For
Virtual value I during the unsaturation of secondary current2' be
The unsaturation time t of secondary current is
T=ω/x；
Step (E) will be calculated the saturated characteristic parameter of electrical energy meter electricity current transformer, be shown by display screen, and pass
Give test terminal.
In conclusion the electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system of the utility model, passes through measurement
Critical saturation current of the current transformer under nominal secondary load is calculated according to electrical energy meter electricity current transformer supersaturation characteristic
The saturated characteristic parameter of electrical energy meter electricity current transformer is obtained, and is that the anti-overcurrent in short-term of electric energy meter is rushed by display and communication output
The foundation of design is hit, to realize the anti-impact property of the overcurrent in short-term test of electric energy meter, convenient test is at low cost, and safety
Can be high, it has a good application prospect.
The basic principles and main features and advantage of the utility model have been shown and described above.The technical staff of the industry
It should be appreciated that the present utility model is not limited to the above embodiments, the above embodiments and description only describe this
The principle of utility model, on the premise of not departing from the spirit and scope of the utility model, the utility model also has various change
And improvement, these various changes and improvements fall within the scope of the claimed invention.The utility model requires protection scope
It is defined by the appending claims and its equivalent thereof.
Claims (6)
1. a kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system, it is characterised in that：Including critical saturation current
Measuring unit, supersaturated characteristic processing unit,
The critical saturation current measuring unit, including current source, adjustable resistance, critical saturation current measuring circuit, the electricity
Stream source is connected with signal input part, the adjustable resistance of critical saturation current measuring circuit respectively by tested current transformer
It connects, the current source is also directly connected to critical saturation current measuring circuit, and the adjustable resistance is also surveyed with critical saturation current
The adjusting output end of amount circuit is connected, critical saturation current measuring unit the connecing as critical saturation current measuring unit
Mouth end is connected with the interface end of supersaturated characteristic processing unit,
The saturated characteristic processing unit, including MCU processor, display screen, RS232 telecommunication circuit, the MCU processor as
The interface end of saturated characteristic processing unit is connected with the interface end of critical saturation current measuring unit, and the MCU processor is also
It is connected respectively with display screen, RS232 telecommunication circuit, the RS232 telecommunication circuit is connected with test terminal.
2. a kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system according to claim 1, feature exist
In：The current source is the current source for exporting low noise power frequency sine wave current signal.
3. a kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system according to claim 1, feature exist
In：The critical saturation current measuring circuit is AD sample circuit, built-in 24 bit AD sample chip.
4. a kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system according to claim 3, feature exist
In：The model ADS1210 sampling A/D chip of the 24 bit AD sample chip.
5. a kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system according to claim 1, feature exist
In：It is connected between the critical saturation current measuring unit, supersaturated characteristic processing unit by SPI communication bus.
6. a kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system according to claim 1, feature exist
In：The resistance value of the adjustable resistance is adjustable, constitutes nominal resistance, adjustable resistance range is between 5 ohm to 1K ohm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108594155A (en) * | 2018-04-28 | 2018-09-28 | 国网江苏省电力有限公司电力科学研究院 | A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system and method |
| CN109633364A (en) * | 2019-01-03 | 2019-04-16 | 广东电网有限责任公司 | A kind of mutual inductor winding and fuse failure appraisal procedure, device and equipment |
-
2018
- 2018-04-28 CN CN201820623891.XU patent/CN208110026U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108594155A (en) * | 2018-04-28 | 2018-09-28 | 国网江苏省电力有限公司电力科学研究院 | A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system and method |
| CN108594155B (en) * | 2018-04-28 | 2024-03-01 | 国网江苏省电力有限公司电力科学研究院 | Supersaturation characteristic parameter measurement system and method for current transformer of electric energy meter |
| CN109633364A (en) * | 2019-01-03 | 2019-04-16 | 广东电网有限责任公司 | A kind of mutual inductor winding and fuse failure appraisal procedure, device and equipment |
| CN109633364B (en) * | 2019-01-03 | 2020-12-04 | 广东电网有限责任公司 | Mutual inductor winding and fuse fault assessment method, device and equipment |
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