CN109981140A - A kind of power carrier communication module power sensitivity test macro - Google Patents
A kind of power carrier communication module power sensitivity test macro Download PDFInfo
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- CN109981140A CN109981140A CN201910342700.1A CN201910342700A CN109981140A CN 109981140 A CN109981140 A CN 109981140A CN 201910342700 A CN201910342700 A CN 201910342700A CN 109981140 A CN109981140 A CN 109981140A
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- 238000004804 winding Methods 0.000 claims description 3
- 230000006855 networking Effects 0.000 description 12
- 230000005611 electricity Effects 0.000 description 9
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
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Abstract
The present invention discloses a kind of Power Line Carrier Communication Module power sensitivity test macro, tests the power level transmitted between electric energy meter and concentrator；It include: filter, coupler, attenuator；The filter is to be separately positioned on that alternating current enters electric energy meter and alternating current enters EMI power line filter on the power supply line of concentrator；The power line being connected between electric energy meter and concentrator is shielding line；The described coupler setting shielding line both ends respectively with electric energy meter or concentrator connecting place；The attenuator is that SMA type step-by-step movement coaxial attenuator is arranged on shielding line.Personnel placement can be optimized using system of the invention, test macro is reusable, and not easy to make mistakes, and test result, which can be observed directly, to be come, and saves manpower.For verifying meter module power sensitivity performance.Its structure is relatively simple, can realize the switching of frequency band by replacing coupler.
Description
Technical field
The present invention relates to grid service field, especially a kind of power carrier communication module power sensitivity test macro.
Background technique
Power line carrier equipment communication performance, which is tested, to provide improved power for enterprise's production and development
And data are supported.Its working principle is that being communication media using power circuit, modulated data onto power circuit as fixation
Frequency signal is simultaneously communicated by fixed coupler.It can be used for laboratory environment to build, simulate field application situation.Test
Deamplification causes to communicate bad situation module in a natural environment.
Electricity market is mounted with a large amount of remote data acquisition terminal (such as: control etc. is born in concentrator, distribution transforming) equipment, these
The age span that equipment is installed and used is big, from the bandwidth carrier communication of electric power narrowband carrier communication originally by now.Due to surveying
Frequency range difference is tried, the change of the different test methods and test environment of broadband and narrowband be easy to cause measurement data inaccurate.
Traditional method is the transmission power and signal waveform for going to observe each module using oscillograph and frequency spectrograph, and such efficiency is slow
And interference caused by the simulated environment that can not rule out.
To provide the life of the production test and Wideband module communication sensitivity that meet the module communication sensitivity of state's net narrowband
Test is produced, the working hour of testing process loss is reduced, improves the accuracy of test, needing to build one can cut in broadband and narrowband
Change and have the PLC communication module power sensitivity test macro of multichannel meter reading ability.
Summary of the invention
The object of the present invention is to provide a kind of Power Line Carrier Communication Module power sensitivity test macros.
The present invention is that technical solution used by realizing its technical purpose is a kind of Power Line Carrier Communication Module power spirit
Sensitivity test macro tests the power level transmitted between electric energy meter and concentrator；Include:
Filter, coupler, attenuator；
The filter is to be separately positioned on that alternating current enters electric energy meter and alternating current enters EMI power supply on the power supply line of concentrator
Line filter；
The power line being connected between electric energy meter and concentrator is shielding line；
The described coupler setting shielding line both ends respectively with electric energy meter or concentrator connecting place；
The attenuator is that SMA type step-by-step movement coaxial attenuator is arranged on shielding line.
Personnel placement can be optimized using system of the invention, test macro is reusable, and not easy to make mistakes, test knot
Fruit, which can directly observe, to come, and saves manpower.For verifying meter module power sensitivity performance.Its structure is relatively simple, leads to
The switching of frequency band can be realized by crossing replacement coupler.
Further, in above-mentioned Power Line Carrier Communication Module power sensitivity test macro: the electric energy meter is
Single-phase electric meter.
Further, in above-mentioned Power Line Carrier Communication Module power sensitivity test macro: also when city is electrically accessed
It is provided with relay protection switch.
Further, in above-mentioned Power Line Carrier Communication Module power sensitivity test macro: the coupler is
Narrowband carrier coupler, including transformer RFT1 are provided with suppression between the transformer RFT1 high-voltage end and input phase line
The filter of 50HZ or more signal processed, the transformer RFT1 low-pressure end connect shielding line by SMA interface.
Further, in above-mentioned Power Line Carrier Communication Module power sensitivity test macro: the inhibition 50HZ
The filter of the above signal includes resistance R11, R12, R13, capacitor C11, C12, C13, C14 and single-pole double-throw switch (SPDT) SW11；
The resistance R13 setting is between input phase line, L1 in one end of resistance R11, R12 and capacitor C11 and input phase line
It is connected, resistance R11, R12 are connected with each other, and are connected with one end of capacitor C12, C13, the other end order of capacitor C12, C13
On No. 1 pin of double-pole double throw switch SW11, the two-phase of 2, No. 3 pins difference phase-connecting wire of single-pole double-throw switch (SPDT) SW11；Capacitor C11
The other end be connected with one end of capacitor C14, the N1 phase in another termination of capacitor C14 input phase line；
The both ends of capacitor C4 connect the 1 of transformer RFT1, No. 2 pin respectively.
Further, in above-mentioned Power Line Carrier Communication Module power sensitivity test macro: the coupler is
Bandwidth carrier coupler, including coupling transformer T1, the coupling transformer T1 are three-winding transformer, primary side is using pressure
Quick resistance RV1 carries out protection to it and is provided with the second filter for inhibiting 50HZ signal and low frequency signal, in one group
Transient diode D1 is added on secondary coil to protect it, shielding line is then connect by SMA interface.
Further, in above-mentioned Power Line Carrier Communication Module power sensitivity test macro: second filtering
Device includes resistance R1, R2, R3, R4, capacitor C1, C2, C3, C4 and single-pole double-throw switch (SPDT) SW1；
One end of resistance R1, R2, R4 and capacitor C1 are connected with L1 phase in input phase line, and the other end of resistance R1, R2 mutually interconnect
It connects, and is connected with one end of capacitor C2, C3, on No. 1 pin of the other end order double-pole double throw switch SW1 of capacitor C2, C3, hilted broadsword
The two-phase of 2, No. 3 pins difference phase-connecting wire of commutator SW1；The other end of resistance R4 and capacitor C1 connect coupling transformer respectively
T1 primary side anode, coupling transformer T1 primary side cathode connect one end of capacitor C4, resistance R3, capacitor C4, resistance R3 the other end with
N1 phase is connected in input phase line.
The present invention is further detailed with reference to the accompanying drawings and detailed description.
Detailed description of the invention
Attached drawing 1 is test macro block diagram of the present invention.
Attached drawing 2 is the narrowband coupler schematic diagram that the present invention uses.
Attached drawing 3 is the wide-band coupler schematic diagram that the present invention uses.
Specific embodiment
Embodiment 1, as shown in Figure 1, being that Power Line Carrier Communication Module power sensitivity is in a kind of detection electric energy meter
It unites, is the power line using power line carrier communication realizing automatic data logging and being arranged by testing electric energy meter in the present embodiment
The power level of carrier communication module tests the performance of Power Line Carrier Communication Module.
As shown in Figure 1, in order to make test environment it is pure, in systems be provided with EMI power line filter, be electric energy meter and
Concentrator provides pure power supply, and in the present embodiment, alternating current enters test macro after first passing through relay protection switch, this
It in embodiment, is powered using three-phase electricity, every phase is using the metering of single-phase electric meter, then by being connected to the power line of concentrator
The carrier signal that carrier communication module exports is transmitted to concentrator.The power line carrier communication mould of the present embodiment as shown in Figure 1:
Block power sensitivity test macro, tests the power level transmitted between electric energy meter and concentrator；Include:
Filter, coupler, attenuator；
In the present embodiment, filter is to be separately positioned on that alternating current enters electric energy meter and alternating current enters on the power supply line of concentrator
EMI power line filter；Due to using three-phase electricity, after relay protection switch, first use an EMI power supply
Line filter is filtered three-phase electricity, provides pure electric energy for concentrator and ammeter, before entering every single-phase electric meter, also
It is filtered using an other EMI power line filter, every single-phase electric meter uses an EMI power line filter, for collection
When middle device is powered, is also filtered again using an EMI power line filter, strive providing pure electricity for electric energy meter and concentrator
Can, prevent to interfere.In the present embodiment, interference of the external signal to experimental situation is isolated using EMI power-supply filter, prevents simultaneously
Interfering with each other between test cell.
The power line being connected between electric energy meter and concentrator is shielding line；Coupler setting shielding line both ends respectively with
Electric energy meter or concentrator connecting place；Attenuator is that SMA type step-by-step movement coaxial attenuator is arranged on shielding line.
Specifically, the test of carrier communication module power sensitivity can be shown as system by power line in the present embodiment
Power electricity (dbmV), can be with the power sensitivity of determining module itself by changing system power level.The basic principle is that will
The normal waveform that sends is decayed after through coupler, so that concentrator and terminal can only receive the letter after being attenuated
Number, such as determine that terminal can receive and identify, it may be determined that the power sensitivity performance of module is normal.
Testing environment can be in the case where not interrupt circuit with 1dB stepping using two groups of SMA type step-by-step movement coaxial attenuators
Form adjust circuit signal level, can be used for adjusting the power level in test macro, have it is small in size, precision is high, steady
The features such as fixed reliable.Attenuation can be determined according to user demand, adjust system attenuation value.
It tests environment and coupler replacement mouth is provided, it can unrestricted choice narrowband coupler or wide-band coupler.One test
Platform can theoretically carry dozens of ammeter terminal module, then to reusable after concentrator writing address.Staff
As long as being inserted into new module on ammeter repeatedly, after the automatic copy reading of concentrator, data, which are returned, receives terminal, as copy reading success.
As shown in Fig. 1, in the present embodiment, groundwork device includes: electromagnetic interface filter, coupler, attenuator, concentration
Device, shielding line, electric energy meter, alternating current cut-in relay protective switch are filtered after protective switch closure using EMI power supply line
Device can have larger inhibition to the interference signal of high frequency, reduce the interference of outer bound pair communication channel.Concentrator access passes through
The three-phase and four-line of MI power line filter is in parallel with coupler.Coupler is divided into A, B, and C is respectively phase electric energy meter output, isolation
And analog communication process, attenuator, which is added, may be selected communication channel pad value.It is needed between coupler and attenuator with shielding line phase
Even, external disturbance is reduced, the anti-stop signal of attenuator surface earthing flows to coupler by shell.By needing to add after attenuator
The coupler output of one same type.Electric energy meter access is in parallel with coupler output with after zero curve by the phase line of filter.
Alternating current three-phase is switched after being electrically accessed by relay protection, as system power supply main switch.EMI power line filter can be effective
Completely cut off outside high-frequency signals to interfere, the clean power supply of concentrator and the output of electric energy meter power line access filter, switch-in coupler,
High-pressure side wiring is completed.SMA type step-by-step movement coaxial attenuator, attenuator can be accessed after being isolated by coupler at shielding line
It can choose the value for needing to decay, power sensitivity test be provided.
Tested using this test platform mainly includes test electric energy meter module power sensitivity and test concentrator module function
Two product tests of rate sensitivity.It is interim:
Following steps are used when testing electric energy meter module power sensitivity:
1, prepare a set of concentrator module passed through by national grid test and electric energy meter module (hereinafter referred to as benchmark mould
Block) and electric energy meter module to be tested it is several.
2, base modules are put into test environment, are obtained by adjusting attenuator: maximum networking sensitivity, maximum reception
Sensitivity, maximum communication sensitivity.(data are as reference data herein, for judging module performance to be measured).
In the present embodiment, maximum networking sensitivity, maximum receiving sensitivity, maximum communication sensitivity are respectively according to such as lower section
Formula determines:
Networking peak response: powering on after attenuator pad value is adjusted to maximum value, due to excessive concentrator module and the electricity of decaying
It can not networking between energy table module.The pad value for reducing attenuator at this time, observes backstage message.Pad value is gradually decreased, until
Concentrator module reports the end PC networking success message, records pad value at this time, is networking peak response.
Maximum receiving sensitivity test method: between module after networking success, being adjusted to maximum value for attenuator pad value, by
It is communicated between excessive concentrator module and electric energy meter module in decaying.When testing electric energy meter module, concentrator module pair is controlled
Electric energy meter module sends the pad value made a copy for and instruct and be gradually reduced attenuator.Electric energy meter module is monitored, whether Observation Blocks connect
It receives and handles and make a copy for instruction.It instructs and sends datagram when electric energy meter module identifies, record sensitivity at this time as maximum
Receiving sensitivity.
Maximum sends sensitivity test method: between module after networking success, accessing frequency spectrograph between two attenuators.
When testing electric energy meter module, the attenuator in electric energy meter module direction is returned to zero；The attenuator in concentrator module direction is increased
5-10 dBuV(can effectively observe the transmission power of electric energy meter).Control concentrator module hair always makes a copy for instruction, when electric energy meter mould
Block can send return instruction after receiving.Frequency spectrograph is adjusted to keep maximum value.The stable image of waveform is grabbed, current frequency range is recorded
Sensitivity.
3, the electric energy meter module in base modules is removed, electric energy meter module to be tested is replaced with and is tested.It obtains: most
Big networking sensitivity, maximum receiving sensitivity, maximum communication sensitivity.Comparison reference data and user demand, judgement can connect
By sensitivity error range, test module performance quality is determined.By the contrast module under the result of test module and equal ambient
Test result compares.It is that sensitivity behaviour is normal by the judgement in error >=5.Remaining module is sent to research and development and is handled.
4, the method can utilize concentrator networking function, realize multiple electric energy meters while testing, and improve testing efficiency.
Test the sensitivity of concentrator modular power when the following steps are included:
1, prepare a set of concentrator module passed through by national grid test and electric energy meter module (hereinafter referred to as benchmark mould
Block) and concentrator module to be tested it is several.
2, base modules are put into test environment, are obtained by adjusting attenuator: maximum networking sensitivity, maximum reception
Sensitivity, maximum communication sensitivity.(data are as reference data herein, for judging module performance to be measured).
3, the concentrator module in base modules is removed, concentrator module to be tested is replaced with and is tested.It obtains: most
Big networking sensitivity, maximum receiving sensitivity, maximum communication sensitivity.Comparison reference data and user demand, judgement can connect
By sensitivity error range, test module performance quality is determined.
In the present embodiment, narrowband coupler or wide-band coupler can be used.
Narrowband coupler is as shown in Figure 2: transformer RFT1 high-voltage end (primary side) is provided with the filter for inhibiting 50HZ or more signal
Wave device, transformer RFT1 low-pressure end (secondary side) connect shielding line by SMA interface.Filter inhibits 50HZ signal and high frequency letter
Number.Spectrum curve can be scanned out by frequency spectrograph.
According to use demand, L1 solder joint can choose any one phase in the ABC three-phase in access electric energy meter/concentrator, N1
Solder joint accesses N phase in electric energy meter/concentrator;Using transformer isolation high pressure, test operation part (attenuator) is made to be in low pressure
State ensures test Environmental security.SMA mouthfuls of access shielding lines.
The filter for inhibiting 50HZ or more signal includes resistance R11, R12, R13, capacitor C11, C12, C13, C14 and hilted broadsword
Commutator SW11；Resistance R13 setting is between input phase line, one end of resistance R11, R12 and capacitor C11 and input phase line
Middle L1 phase is connected, and resistance R11, R12 are connected with each other, and are connected with one end of capacitor C12, C13, the other end of capacitor C12, C13
On No. 1 pin of order double-pole double throw switch SW11, the two-phase of 2, No. 3 pins difference phase-connecting wire of single-pole double-throw switch (SPDT) SW11；Electricity
The other end for holding C11 is connected with one end of capacitor C14, the N1 phase in another termination input phase line of capacitor C14；The two of capacitor C4
End connects 1, No. 2 pin of transformer RFT1 respectively.
The wide-band coupler that the present embodiment uses is as shown in Figure 3: coupling transformer is using three-winding transformer, transformation
Second filter is arranged in device high-voltage end (former end), and second filter inhibits 50HZ signal and low frequency signal.Spectrum curve can be by
Frequency spectrograph scans out.It is additionally added varistor RV1 in alternating current to protect high pressure terminal circuit, transient diode D1 is added to change
Depressor is protected.
According to use demand, L solder joint can choose any one phase in the A BC three-phase in access electric energy meter/concentrator, N weldering
N phase in point access electric energy meter/concentrator;Using transformer isolation high pressure, test operation part (attenuator) is made to be in low pressure shape
State ensures test Environmental security.SMA mouthfuls of access shielding lines.
Second filter includes resistance R1, R2, R3, R4, capacitor C1, C2, C3, C4 and single-pole double-throw switch (SPDT) SW1；Resistance
One end of R1, R2, R4 and capacitor C1 are connected with L1 phase in input phase line, and the other end of resistance R1, R2 is connected with each other, and with electricity
The one end for holding C2, C3 is connected, on No. 1 pin of the other end order double-pole double throw switch SW1 of capacitor C2, C3, single-pole double-throw switch (SPDT)
The two-phase of 2, No. 3 pins difference phase-connecting wire of SW1；The other end of resistance R4 and capacitor C1 connect coupling transformer T1 primary side sun respectively
Pole, coupling transformer T1 primary side cathode connect one end of capacitor C4, resistance R3, capacitor C4, the other end of resistance R3 and input phase line
Middle N1 phase is connected.
Claims (7)
1. a kind of Power Line Carrier Communication Module power sensitivity test macro, to the power transmitted between electric energy meter and concentrator
Level is tested；It is characterized by comprising:
Filter, coupler, attenuator；
The filter is to be separately positioned on that alternating current enters electric energy meter and alternating current enters EMI power supply on the power supply line of concentrator
Line filter；
The power line being connected between electric energy meter and concentrator is shielding line；
The described coupler setting shielding line both ends respectively with electric energy meter or concentrator connecting place；
The attenuator is that SMA type step-by-step movement coaxial attenuator is arranged on shielding line.
2. Power Line Carrier Communication Module power sensitivity test macro according to claim 1, it is characterised in that: described
Electric energy meter be single-phase electric meter.
3. Power Line Carrier Communication Module power sensitivity test macro according to claim 1, it is characterised in that: in city
Relay protection switch is additionally provided with when being electrically accessed.
4. Power Line Carrier Communication Module power sensitivity test macro according to claim 1 or 2 or 3, feature exist
In: the coupler is narrowband carrier coupler, including transformer RFT1, in the transformer RFT1 high-voltage end and input
The filter for inhibiting 50HZ or more signal is provided between phase line, the transformer RFT1 low-pressure end connects screen by SMA interface
Cover line.
5. Power Line Carrier Communication Module power sensitivity test macro according to claim 4, it is characterised in that: described
The filter of inhibition 50HZ or more signal include that resistance R11, R12, R13, capacitor C11, C12, C13, C14 and single-pole double throw are opened
Close SW11；
The resistance R13 setting is between input phase line, L1 in one end of resistance R11, R12 and capacitor C11 and input phase line
It is connected, resistance R11, R12 are connected with each other, and are connected with one end of capacitor C12, C13, the other end order of capacitor C12, C13
On No. 1 pin of double-pole double throw switch SW11, the two-phase of 2, No. 3 pins difference phase-connecting wire of single-pole double-throw switch (SPDT) SW11；Capacitor C11
The other end be connected with one end of capacitor C14, the N1 phase in another termination of capacitor C14 input phase line；
The both ends of capacitor C4 connect the 1 of transformer RFT1, No. 2 pin respectively.
6. Power Line Carrier Communication Module power sensitivity test macro according to claim 1 or 2 or 3, feature exist
It is bandwidth carrier coupler in: the coupler, including coupling transformer T1, the coupling transformer T1 are that three winding becomes
Depressor, primary side carry out that protection and be provided with inhibits 50HZ signal and low frequency signal to it using varistor RV1 the
Two filters are added transient diode D1 on one group secondary coil and protect to it, then connect shielding by SMA interface
Line.
7. Power Line Carrier Communication Module power sensitivity test macro according to claim 6, it is characterised in that: described
Second filter include resistance R1, R2, R3, R4, capacitor C1, C2, C3, C4 and single-pole double-throw switch (SPDT) SW1；
One end of resistance R1, R2, R4 and capacitor C1 are connected with L1 phase in input phase line, and the other end of resistance R1, R2 mutually interconnect
It connects, and is connected with one end of capacitor C2, C3, on No. 1 pin of the other end order double-pole double throw switch SW1 of capacitor C2, C3, hilted broadsword
The two-phase of 2, No. 3 pins difference phase-connecting wire of commutator SW1；The other end of resistance R4 and capacitor C1 connect coupling transformer respectively
T1 primary side anode, coupling transformer T1 primary side cathode connect one end of capacitor C4, resistance R3, capacitor C4, resistance R3 the other end with
N1 phase is connected in input phase line.
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| CN201910342700.1A CN109981140B (en) | 2019-04-26 | 2019-04-26 | Power sensitivity test system of power carrier communication module |
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