CN105301551A - Watt-hour meter calibration device and method outputting current under 1mA - Google Patents
Watt-hour meter calibration device and method outputting current under 1mA Download PDFInfo
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- CN105301551A CN105301551A CN201510718489.0A CN201510718489A CN105301551A CN 105301551 A CN105301551 A CN 105301551A CN 201510718489 A CN201510718489 A CN 201510718489A CN 105301551 A CN105301551 A CN 105301551A
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Abstract
The invention relates to a watt-hour meter calibration device and a method outputting current under 1mA, which are used to accurately output 0.3mA test current during start test of a tested watt-hour meter in the process of alternating-current watt-hour meter calibration. The device comprises a current power source, a to-be-detected meter position, a current transformer, and a double-pole double-throw relay. The current power source, the primary side of the current transformer, the secondary side of the current transformer, the double-pole double-throw relay and the to-be-detected meter position are connected in sequence. The output current of the current power source is 180mA, and the magnification range of the current transformer is 180-600. Compared with the prior art, the device and the method are advantageous in that the device and the method are applicable to start test, the electromagnetic noise is reduced, the current is stable, and the like.
Description
Technical field
The present invention relates to electric-power metering AC energy meter verification test field, especially relate to a kind of electric energy meter calibrating apparatus and the method that export below 1mA electric current.
Background technology
Need to carry out " running-up test " test to tested table in electric energy meter calibration process.According to national quality inspection and quarantine general bureau " JJG596-2012 electronic type AC energy meter " vertification regulation, with the requirement of State Grid Corporation of China's company standard " Q/GDW1827-2013 three-phase intelligent electric-energy meter technical manual ", minimum " running-up test " measuring current is 0.3mA.The precision of test current is the technical indicator that deviation is not more than 5%.But in reality, generally domestic calibrating installation all can not accomplish the small area analysis stablizing, export accurately below 1mA.
Inside the industry of electric energy meter measurement verification, the common way obtaining " running-up test " measuring current has two kinds.One is the measuring current directly being exported " running-up test " by current power source, is connected to each test epi-position by the current return of calibrating installation; Another is current output terminal current transformer being connected on power source, power source output mutual inductor primary side big current when doing " running-up test ", converted to " false actuation test " measuring current value of needs by current transformer after, access the current return of calibrating installation again, be connected to each test epi-position by the current return of series connection.They have a general character, and that is exactly the current return that they make use of series connection existing in calibrating installation.More than the general all exceedance rice of length of current return in electric energy meter calibrating apparatus, in fact the current circuit of calibrating installation serves the effect of radio receiving antenna, so, current return has been responded to the HF noise signal of big and small various frequency.Current amplitude through reality test random noise signal can reach few tens of microamps.And the marking current of " running-up test " only has 0.3mA, the impact of these electromagnetic noises must be subject at work and make output current unstable, even can cause current power source that self-excitation occurs.
Summary of the invention
Object of the present invention be exactly provide to overcome defect that above-mentioned prior art exists a kind of be suitable for start test, reduce electromagnetic noise, the electric energy meter calibrating apparatus of the following electric current of output 1mA of current stabilization and method.
Object of the present invention can be achieved through the following technical solutions:
A kind of electric energy meter calibrating apparatus exporting below 1mA electric current, for accurately exporting the measuring current of below 1mA in the tested table starting characteristics test test of AC energy meter verification process, this device comprises current power source, epi-position to be detected, current transformer and dpdt relay, described current power source, the primary side of current transformer, the secondary side of current transformer, dpdt relay are connected successively with epi-position to be detected, described current power source output current is 180mA, and the enlargement factor scope of current transformer is 180-600.
Described current transformer is CT-082/0.6 punching current transformer, and mutual inductor precision is 0.2 grade.
Described current transformer and dpdt relay are equipped with three groups, often organize the phase in the ABC three-phase of corresponding epi-position to be detected respectively, and dpdt relay side are connected with a phase terminal of epi-position to be detected, opposite side short circuit.
The secondary side of described current transformer is less than 50cm to the cable run distance of epi-position to be detected, and current power source adopts sectional area to be 2.5mm to the primary side of current transformer
2multiply electric current flexible cord punching cabling.
Export an electric energy meter calibration method for below 1mA electric current, comprise the following steps:
1) the running-up test preparatory stage: current power source does not send electric current, the primary side of current transformer does not have electric current, and dpdt relay is placed in normally off, the secondary side short circuit of current transformer;
2) the running-up test stage: dpdt relay is placed in normally open, the secondary side of every phase current mutual inductor is connected with the corresponding of epi-position to be detected, current power source output current, and current transformer enlargement factor is set, make the secondary side of every phase current mutual inductor export measuring current according to Principle of Current Mutual Inductance.
Described step 2) in the output current in current power source be 180mA, described current transformer enlargement factor is 600.
Compared with prior art, the present invention has the following advantages:
One, startup test is suitable for: the present invention installs current transformer additional by adopting between electric energy epi-position to be measured and every, current power source, make the current power source that originally can not produce Weak current can stablize, send accurately the measuring current of 0.3mA, solve the difficult problem that existing domestic calibrating installation all can not accomplish to stablize, export accurately the small area analysis of below 1mA.
Two, electromagnetic noise, current stabilization is reduced: the present invention is by being arranged on the mode of next-door neighbour's test epi-position by current transformer, limit the length of transformer secondary circuit circuit, its distance is made to be less than 50cm, thus reach the effect reducing the interference of all kinds of high frequency electromagnetic noise, achieve and obtain object that is stable, " running-up test " test signal accurately.
Accompanying drawing explanation
Fig. 1 is the current transformer connection layout of the embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment:
The object of the invention is to solve measuring current that is stable in the electric energy meter calibrating apparatus of multi-epitope, that export below 1mA accurately, to meet the requirement to accurate small area analysis in electric energy meter " running-up test " test process.
In order to ensure to be stablized in each epi-position, " running-up test " measuring current accurately, we are configured with the shape small size current mutual inductor of 3 1:600 in each epi-position respectively by A/B/C three-phase.Mutual inductor precision is 0.2 grade.When non-" running-up test ", current transformer not cut-in operation epi-position.When carrying out " running-up test ", by the connection of relay, the secondary circuit of mutual inductor is made to connect the corresponding current terminal of epi-position pocket watch seat.When mutual inductor primary circuit inputs stable 180mA electric current, " running-up test " measuring current of stable 0.3mA accurately just can be obtained at mutual inductor secondary side.
As shown in Figure 1, each epi-position is configured with duplicate punching shape small size current mutual inductor 3 respectively by A/B/C three-phase, and model is CT-082/0.6.Mutual inductor is connected respectively by the current terminal that dpdt relay is corresponding with on electric energy meter calibration station pocket watch seat.When non-" running-up test " state, state that relay is in " normally closed ", disconnects with pocket watch seat.Mutual inductor does not have electric current in primary circuit, and transformer secondary circuit is by " normally closed " contact short circuit.In " running-up test " state, state that relay is in " often opening ", the mutual inductor current terminal corresponding to pocket watch seat is connected.Mutual inductor primary circuit input service electric current, transformer secondary circuit exports " running-up test " measuring current of needs to tested electric energy meter.
Implement conveniently to ensure to install, punch current transfomer and dpdt relay are arranged on (hereinafter referred to as mutual inductor platelet) on same little circuit board by us.In order to reduce the noise interferences that transformer secondary circuit circuit is responded to, mutual inductor platelet is arranged on the side of each pocket watch seat of work epi-position by us.Ensure that the wiring path length of secondary circuit is not more than 50cm (secondary wiring path is shorter, and the stability that small area analysis exports is better).In the wiring of mutual inductor primary circuit, select sectional area to be the multiply electric current flexible cord punching cabling of 2.5mm2, wear the mutual inductor around the last epi-position to calibrating installation successively from the mutual inductor of the 1st epi-position of calibrating installation; Then, be close to primary current line and turn back to the 1st epi-position, then by other relays access current power source circuit; A/B/C three-phase is divided to arrange respectively.When carrying out " running-up test " and testing, transformer secondary circuit is connected to the current measurement circuit of pocket watch seat by the normally opened contact of dpdt relay.Meanwhile, the current circuit of series connection mutually between former epi-position is cut by relay, ensures that each epi-position mutual inductor secondary circuit is relatively independent.When non-" running-up test " state, transformer secondary circuit dpdt relay is in normally closed contact, disconnects with the current terminal of epi-position pocket watch seat, recovers the current circuit of series connection mutually between each epi-position former simultaneously.Do not affect the work in former calibrating loop.
Claims (6)
1. one kind exports the electric energy meter calibrating apparatus of below 1mA electric current, for accurately exporting the measuring current of below 1mA in the tested table starting characteristics test test of AC energy meter verification process, it is characterized in that, this device comprises current power source, epi-position to be detected, current transformer and dpdt relay, described current power source, the primary side of current transformer, the secondary side of current transformer, dpdt relay are connected successively with epi-position to be detected, described current power source output current is 180mA, and the enlargement factor scope of current transformer is 180-600.
2. a kind of electric energy meter calibrating apparatus exporting below 1mA electric current according to claim 1, is characterized in that, described current transformer is CT-082/0.6 punching current transformer, and mutual inductor precision is 0.2 grade.
3. a kind of electric energy meter calibrating apparatus exporting below 1mA electric current according to claim 1, it is characterized in that, described current transformer and dpdt relay are equipped with three groups, often organize the phase in the ABC three-phase of corresponding epi-position to be detected respectively, and dpdt relay side is connected with a phase terminal of epi-position to be detected, opposite side short circuit.
4. a kind of electric energy meter calibrating apparatus exporting below 1mA electric current according to claim 1, it is characterized in that, the secondary side of described current transformer is less than 50cm to the cable run distance of epi-position to be detected, and current power source adopts sectional area to be 2.5mm to the primary side of current transformer
2multiply electric current flexible cord punching cabling.
5. a calibration method for the electric energy meter calibrating apparatus of the output 1mA following electric current of application as described in any one of claim 1-4, is characterized in that, comprise the following steps:
1) the running-up test preparatory stage: current power source does not send electric current, the primary side of current transformer does not have electric current, and dpdt relay is placed in normally off, the secondary side short circuit of current transformer;
2) the running-up test stage: dpdt relay is placed in normally open, the secondary side of every phase current mutual inductor is connected with the corresponding of epi-position to be detected, current power source output current, and current transformer enlargement factor is set, make the secondary side of every phase current mutual inductor export measuring current according to Principle of Current Mutual Inductance.
6. calibration method according to claim 5, is characterized in that, described step 2) in the output current in current power source be 180mA, described current transformer enlargement factor is 600.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510718489.0A CN105301551A (en) | 2015-10-29 | 2015-10-29 | Watt-hour meter calibration device and method outputting current under 1mA |
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| CN201510718489.0A CN105301551A (en) | 2015-10-29 | 2015-10-29 | Watt-hour meter calibration device and method outputting current under 1mA |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501761A (en) * | 2016-12-26 | 2017-03-15 | 烟台东方威思顿电气股份有限公司 | Three-phase intelligent electric-energy meter simulation detection system |
| CN110907729A (en) * | 2019-11-29 | 2020-03-24 | 科大智能电气技术有限公司 | Power equipment testing method based on active compensation mutual inductor and three-phase source |
| CN113030837A (en) * | 2021-03-04 | 2021-06-25 | 青岛鼎信通讯股份有限公司 | Full-range current output module and method based on electric energy meter calibrating device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201569736U (en) * | 2009-12-11 | 2010-09-01 | 中国电力科学研究院 | Watt-hour meter calibration device |
| CN203101629U (en) * | 2013-03-12 | 2013-07-31 | 郑州三晖电气股份有限公司 | Electrical energy meter calibration device with high accuracy under low-current state |
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2015
- 2015-10-29 CN CN201510718489.0A patent/CN105301551A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201569736U (en) * | 2009-12-11 | 2010-09-01 | 中国电力科学研究院 | Watt-hour meter calibration device |
| CN203101629U (en) * | 2013-03-12 | 2013-07-31 | 郑州三晖电气股份有限公司 | Electrical energy meter calibration device with high accuracy under low-current state |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501761A (en) * | 2016-12-26 | 2017-03-15 | 烟台东方威思顿电气股份有限公司 | Three-phase intelligent electric-energy meter simulation detection system |
| CN110907729A (en) * | 2019-11-29 | 2020-03-24 | 科大智能电气技术有限公司 | Power equipment testing method based on active compensation mutual inductor and three-phase source |
| CN113030837A (en) * | 2021-03-04 | 2021-06-25 | 青岛鼎信通讯股份有限公司 | Full-range current output module and method based on electric energy meter calibrating device |
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Application publication date: 20160203 |