CN102332684B - Ferromagnetic resonance-preventing self-powered 2PT three-phase three-wire electronic transformer high-voltage electric energy metering cabinet or metering box - Google Patents
Ferromagnetic resonance-preventing self-powered 2PT three-phase three-wire electronic transformer high-voltage electric energy metering cabinet or metering box Download PDFInfo
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- CN102332684B CN102332684B CN201110233245.5A CN201110233245A CN102332684B CN 102332684 B CN102332684 B CN 102332684B CN 201110233245 A CN201110233245 A CN 201110233245A CN 102332684 B CN102332684 B CN 102332684B
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- 230000005294 ferromagnetic effect Effects 0.000 title 1
- 238000013016 damping Methods 0.000 claims abstract description 32
- 238000001914 filtration Methods 0.000 claims abstract description 24
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 24
- 238000004804 winding Methods 0.000 claims description 40
- 238000006243 chemical reaction Methods 0.000 claims description 33
- 239000000203 mixture Substances 0.000 claims description 5
- 230000005350 ferromagnetic resonance Effects 0.000 abstract 2
- 238000002955 isolation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 229920006395 saturated elastomer Polymers 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The invention discloses a ferroresonance-preventing self-powered 2PT three-phase three-wire electronic transformer high-voltage electric energy metering cabinet or metering box, which comprises 2 groups of electronic combined transformers and a ferroresonance-preventing self-powered device and 1 electronic electric energy meter, wherein the ferroresonance-preventing self-powered device of the electronic combined transformers comprises an electronic voltage transformer, a damping resistor, an energy supply transformer, an isolation transformer, a rectification filtering voltage stabilizing circuit and an electronic current transformer, and at least one end of a primary coil of the energy supply transformer is connected with the damping resistor in series and then is connected with two primary ends of the electronic voltage transformer in parallel; the primary coils of the electronic voltage transformers of the 2 groups of electronic combined transformers prevent ferromagnetic resonance self-powered devices are respectively connected with buses. The invention provides a 2PT three-phase three-wire high-voltage electric energy metering cabinet or metering box which can not generate overlarge resonant current and achieve the aim of preventing ferromagnetic resonance.
Description
[technical field]
The present invention relates to the Electric Energy Metering Technology field of power distribution network observing and controlling, specifically the self-powered 2PT phase three-wire three of anti-ferroresonance electronic mutual inductor proportioning device of high voltage electric energy or batch meter.
[background technology]
Used 2PT phase three-wire three proportioning device of high voltage electric energy, batch meter adopt electromagnetic potential transformer to obtain voltage signal mostly, electromagnetic potential transformer easily and electrical network generation ferroresonance, cause high-voltage insurance fusing, even cause voltage transformer (VT) blast, jeopardize power grid security, therefore, become a large technical barrier of proportioning device of high voltage electric energy, batch meter.Though electronic type voltage transformer is difficult for and electrical network generation ferroresonance, output power signal is very little, now generally adopts external low-tension supply to provide working power for secondary electron instrument and meters such as its secondary singal translation circuit and electric energy meters.But if proportioning device of high voltage electric energy, batch meter adopt external low-tension supply to provide working power for electric energy meter, the reliability of electric energy metrical can be subject to the impact of external power supply, is unfavorable for anti-electricity-theft.Though there is employing separately to connect electromagnetic potential transformer power supply, without external low-tension supply, but do not take the magnetically saturated problem of anti-electromagnetic potential transformer, the electromagnetic potential transformer that solves power supply easily and electrical network generation ferroresonance, cause high-voltage insurance fusing, even cause the blast of supply voltage mutual inductor, jeopardize the problems such as power grid security.
[summary of the invention]
The present invention has overcome the deficiency of above-mentioned technology, provides a kind of and can not produce excessive resonance current, reaches 2PT phase three-wire three proportioning device of high voltage electric energy or the batch meter of the object of anti-ferroresonance.
For achieving the above object, the present invention has adopted following technical proposal:
A kind of anti-ferroresonance self-powered 2PT phase three-wire three electronic mutual inductor proportioning device of high voltage electric energy or batch meter, comprise 2 groups of anti-ferroresonance self-power supply devices of electronic combined mutual inductor and 1 electronic electric energy meter, the anti-ferroresonance self-power supply device of electronic combined mutual inductor comprises electronic type voltage transformer, damping resistance, energy supply transformer, isolating transformer, rectification filtering voltage stabilizing circuit, electronic current mutual inductor, and the primary winding of described energy supply transformer is connected in parallel on electronic type voltage transformer two ends once after having one end series damping resistor at least; The secondary coil of described energy supply transformer connects described isolating transformer, rectification filtering voltage stabilizing circuit described in the secondary of isolating transformer output termination, and the output termination secondary voltage signal conversion circuit of rectification filtering voltage stabilizing circuit also provides working power for it; The secondary voltage signal output part of described electronic type voltage transformer is connected with secondary voltage signal conversion circuit input end, the secondary voltage signal after the secondary voltage signal of electronic type voltage transformer output is converted by secondary voltage signal conversion circuit after output transform; Another bus of another termination of termination bus of the primary winding of electronic type voltage transformer, the secondary current signal output part connecting secondary current signal translation circuit of electronic current mutual inductor, the secondary current signal after the secondary current signal of electronic current mutual inductor output is converted by secondary current signal conversion circuit after output transform; Described rectification filtering voltage stabilizing circuit is also connected with secondary current signal conversion circuit and for it provides working power, described rectification filtering voltage stabilizing circuit, secondary voltage signal conversion circuit, secondary current signal conversion circuit connect respectively electronic electric energy meter;
One termination A phase bus of the primary winding of the electronic type voltage transformer of one group of anti-ferroresonance self-power supply device of electronic combined mutual inductor, another termination B phase bus of the primary winding of this electronic type voltage transformer, once the connecting with A phase bus of the electronic current mutual inductor of this group electronic combined mutual inductor anti-ferroresonance self-power supply device;
One termination C phase bus of the primary winding of the electronic type voltage transformer of the anti-ferroresonance self-power supply device of another group electronic combined mutual inductor, another termination B phase bus of the primary winding of this electronic type voltage transformer, once the connecting with C phase bus of the electronic current mutual inductor of this group electronic combined mutual inductor anti-ferroresonance self-power supply device.
Described damping resistance adopts linear resistance, and the primary winding of described energy supply transformer is connected in parallel on electronic type voltage transformer two ends once after having one end series connection linear resistance at least.
Described damping resistance adopts posistor, and the primary winding of described energy supply transformer is connected in parallel on electronic type voltage transformer two ends once after having one end series connection posistor at least.
Described damping resistance adopts the resistance in series of posistor and linear resistance composition, and the primary winding of described energy supply transformer has at least one end to connect after described resistance in series to be connected in parallel on electronic type voltage transformer two ends once.
Described damping resistance adopts the parallel resistance of posistor and linear resistance composition, and the primary winding of described energy supply transformer has at least one end to connect after described parallel resistance to be connected in parallel on electronic type voltage transformer two ends once.
The invention has the beneficial effects as follows:
1, on energy supply transformer primary winding after series damping resistor, when occurring to close a floodgate suddenly or during capacitor discharge, because damping resistance is larger, charging current greatly reduces, iron core is difficult for saturated, and the figure of merit value in loop reduces greatly, gets and can not produce excessive resonance current by branch road; Utilize electronic type voltage transformer to be difficult for the feature with electrical network generation ferroresonance, by it, get voltage signal, again can self-powered thereby reach the voltage signal that can not only obtain power distribution network, and the object of the anti-ferroresonance of whole device, improved safety and reliability and the anti-electricity-theft performance of whole device.
2, because the present invention will get voltage signal and power taking can be placed on same position, be divided into again two different branch roads and transmit output, so can branch road series connection above not affect the accuracy of voltage signal compared with large resistance because getting, although can affect the internal resistance of self powered supply, but the working power providing due to need is direct current, and power demand is generally not very big, can be easy to solve by mu balanced circuit, thereby can realize both anti-ferroresonances, without external working power, even can accomplish with existing electromagnetic transformer completely compatible again.
3, damping resistance of the present invention, different compositions also has different separately beneficial effects.Adopt linear resistance to form simple; Adopt posistor, when resonance current increases, temperature raises, and resistance increases, and can strengthen the ability that suppresses resonance current; Adopt posistor to connect with linear resistance or the posistor temperature characterisitic that can improve damping resistance in parallel with linear resistance.
[accompanying drawing explanation]
Fig. 1 does not have the equivalent resonant tank circuit schematic diagram of series damping resistor on winding of energy supply transformer;
Fig. 2 is in series with the circuit theory diagrams of the equivalent resonant tank of damping resistance R on winding of energy supply transformer;
Fig. 3 is that damping resistance adopts the self-powered 2PT phase three-wire three of the anti-ferroresonance electronic mutual inductor proportioning device of high voltage electric energy of linear resistance or the schematic diagram of batch meter;
Fig. 4 is that damping resistance adopts the self-powered 2PT phase three-wire three of the anti-ferroresonance electronic mutual inductor proportioning device of high voltage electric energy of posistor or the schematic diagram of batch meter;
Fig. 5 is that damping resistance adopts posistor and the self-powered 2PT phase three-wire three of the anti-ferroresonance electronic mutual inductor proportioning device of high voltage electric energy of linear resistance resistance in series or the schematic diagram of batch meter;
Fig. 6 is that damping resistance adopts posistor and the self-powered 2PT phase three-wire three of the anti-ferroresonance electronic mutual inductor proportioning device of high voltage electric energy of linear resistance parallel resistance or the schematic diagram of batch meter.
[embodiment]
A kind of anti-ferroresonance self-powered 2PT phase three-wire three electronic mutual inductor proportioning device of high voltage electric energy or batch meter, comprise 2 groups of anti-ferroresonance self-power supply devices of electronic combined mutual inductor and 1 electronic electric energy meter 8, the anti-ferroresonance self-power supply device of electronic combined mutual inductor comprises electronic type voltage transformer 1, damping resistance 2, energy supply transformer 3, isolating transformer 4A, rectification filtering voltage stabilizing circuit 4B, electronic current mutual inductor 6, the primary winding of described energy supply transformer 3 is connected in parallel on electronic type voltage transformer 1 two ends once after having one end series damping resistor 2 at least, the secondary coil of described energy supply transformer 3 meets described isolating transformer 4A, rectification filtering voltage stabilizing circuit 4B described in the secondary output termination of isolating transformer 4A, the output termination secondary voltage signal conversion circuit 5 of rectification filtering voltage stabilizing circuit 4B also provides working power for it, the secondary voltage signal output part of described electronic type voltage transformer 1 is connected with secondary voltage signal conversion circuit 5 input ends, the secondary voltage signal after the secondary voltage signal of electronic type voltage transformer 1 output is converted by secondary voltage signal conversion circuit 5 after output transform, one termination bus other end ground connection of the primary winding of electronic type voltage transformer 1, the secondary current signal output part connecting secondary current signal translation circuit 7 of electronic current mutual inductor 6, the secondary current signal after the secondary current signal of electronic current mutual inductor 6 outputs is converted by secondary current signal conversion circuit 7 after output transform, described rectification filtering voltage stabilizing circuit 4B is also connected with secondary current signal conversion circuit 7 and provides working power for it, described rectification filtering voltage stabilizing circuit 4B, secondary voltage signal conversion circuit 5, secondary current signal conversion circuit 7 connect respectively electronic electric energy meter 8,
One termination A phase bus of the primary winding of the electronic type voltage transformer 1 of one group of anti-ferroresonance self-power supply device of electronic combined mutual inductor, another termination B phase bus of the primary winding of this electronic type voltage transformer 1, once the connecting with A phase bus of the electronic current mutual inductor 6 of this group electronic combined mutual inductor anti-ferroresonance self-power supply device;
One termination C phase bus of the primary winding of the electronic type voltage transformer 1 of the anti-ferroresonance self-power supply device of another group electronic combined mutual inductor, another termination B phase bus of the primary winding of this electronic type voltage transformer 1, once the connecting with C phase bus of the electronic current mutual inductor 6 of this group electronic combined mutual inductor anti-ferroresonance self-power supply device.
Because the building form of damping circuit 2 is different, the present invention can adopt various embodiments, specific as follows:
Embodiment 1: referring to Fig. 3, described damping resistance 2 adopts linear resistance, and the primary winding of described energy supply transformer 3 is connected in parallel on electronic type voltage transformer 1 two ends once after having one end series connection linear resistance at least; The secondary coil of described energy supply transformer 3 meets described isolating transformer 4A, rectification filtering voltage stabilizing circuit 4B described in the secondary of isolating transformer 4A output termination, the output termination secondary voltage signal conversion circuit 5 of rectification filtering voltage stabilizing circuit 4B; The secondary voltage signal output part of described electronic type voltage transformer 1 is connected with secondary voltage signal conversion circuit 5 input ends, the secondary voltage signal after the secondary voltage signal of electronic type voltage transformer 1 output is converted by secondary voltage signal conversion circuit 5 after output transform.
Embodiment 2: referring to Fig. 4, described damping resistance 2 adopts posistor.The primary winding of described energy supply transformer 3 is connected in parallel on electronic type voltage transformer 1 two ends once after having one end series connection posistor at least; The secondary coil of described energy supply transformer 3 meets described isolating transformer 4A, rectification filtering voltage stabilizing circuit 4B described in the secondary of isolating transformer 4A output termination, the output termination secondary voltage signal conversion circuit 5 of rectification filtering voltage stabilizing circuit 4B; The secondary voltage signal output part of described electronic type voltage transformer 1 is connected with secondary voltage signal conversion circuit 5 input ends, the secondary voltage signal after the secondary voltage signal of electronic type voltage transformer 1 output is converted by secondary voltage signal conversion circuit 5 after output transform.
Embodiment 3: referring to Fig. 5, and the resistance in series that described damping resistance 2 adopts posistor and linear resistance to form.After the resistance in series that the primary winding of described energy supply transformer 3 has at least one end series connection posistor and linear resistance to form, be connected in parallel on electronic type voltage transformer 1 two ends once; The secondary coil of described energy supply transformer 3 meets described isolating transformer 4A, rectification filtering voltage stabilizing circuit 4B described in the secondary of isolating transformer 4A output termination, the output termination secondary voltage signal conversion circuit 5 of rectification filtering voltage stabilizing circuit 4B; The secondary voltage signal output part of described electronic type voltage transformer 1 is connected with secondary voltage signal conversion circuit 5 input ends, the secondary voltage signal after the secondary voltage signal of electronic type voltage transformer 1 output is converted by secondary voltage signal conversion circuit 5 after output transform.
Embodiment 4: referring to Fig. 6, described damping resistance 2 adopts posistor and linear resistance to form parallel resistance, and the primary winding of described energy supply transformer 3 is connected in parallel on electronic type voltage transformer 1 two ends once after having at least one end series connection to form parallel resistance by posistor and linear resistance; The secondary coil of described energy supply transformer 3 meets described isolating transformer 4A, rectification filtering voltage stabilizing circuit 4B described in the secondary of isolating transformer 4A output termination, the output termination secondary voltage signal conversion circuit 5 of rectification filtering voltage stabilizing circuit 4B; The secondary voltage signal output part of described electronic type voltage transformer 1 is connected with secondary voltage signal conversion circuit 5 input ends, the secondary voltage signal after the secondary voltage signal of electronic type voltage transformer 1 output is converted by secondary voltage signal conversion circuit 5 after output transform.
The anti-ferroresonance ultimate principle of the present invention is as follows:
Described energy supply transformer is the same with electromagnetic potential transformer, it is all the inductance element of ribbon core, excite the condition of ferroresonance identical, as: three-phase, unexpected combined floodgate, the singlephase earth fault of asynchronous switch-on, unloaded bus or power transmission sequence are not eliminated suddenly again etc., they have common feature, that is: shooting conditions is accidental, resonance occurs in the transient state process of electrical network, iron core is easily saturated, there is power-to-ground capacitance, add electrical network internal resistance very little, energy supply transformer equivalent resistance is also very little, while there is resonance, can equivalence become circuit as shown in Figure 1.Wherein r is the summation of the internal resistance of source and energy supply transformer equivalent resistance.When having while send out swashing, as unexpected combined floodgate or capacitor discharge, to the charging of energy supply transformer, because of the internal resistance of source, r is very little, and electric current is larger, and iron core occurs easily saturated, and the quality factor q value in loop is very high, easily produces the resonance current that surpasses hundreds of times rated exciting current.As series damping resistor R on winding of energy supply transformer, as shown in Figure 2, while there is again unexpected combined floodgate or capacitor discharge, because R is larger, charging current greatly reduces, and iron core is difficult for saturated, and the quality factor q value in loop reduces greatly, can not produce excessive resonance current, thereby reach the object of anti-ferroresonance.Because the present invention will get voltage signal and power taking can be placed on same position, be divided into again two different branch roads and transmit output, so can branch road series connection above not affect the accuracy of voltage signal compared with large resistance R because getting, although can affect the internal resistance of energy supply power supply, but the working power providing due to need is direct current, and power demand is generally not very big, can be easy to solve by mu balanced circuit, thereby can realize both anti-ferroresonances, without external working power, affect again the reliability of electric energy metrical, even can accomplish with existing electromagnetic transformer completely compatible.
Claims (5)
1. the self-powered 2PT phase three-wire three of an anti-ferroresonance electronic mutual inductor proportioning device of high voltage electric energy, it is characterized in that comprising 2 groups of anti-ferroresonance self-power supply devices of electronic combined mutual inductor and 1 electronic electric energy meter (8), the anti-ferroresonance self-power supply device of electronic combined mutual inductor comprises electronic type voltage transformer (1), damping resistance (2), energy supply transformer (3), isolating transformer (4A), rectification filtering voltage stabilizing circuit (4B), electronic current mutual inductor (6), the primary winding of described energy supply transformer (3) has the two ends that are connected in parallel on electronic type voltage transformer (1) primary winding after one end series damping resistor (2) at least, the secondary coil of described energy supply transformer (3) connects described isolating transformer (4A), rectification filtering voltage stabilizing circuit (4B) described in the secondary output termination of isolating transformer (4A), the output termination secondary voltage signal conversion circuit (5) of rectification filtering voltage stabilizing circuit (4B) also provides working power for it, the secondary voltage signal output part of described electronic type voltage transformer (1) is connected with secondary voltage signal conversion circuit (5) input end, the secondary voltage signal after the secondary voltage signal of electronic type voltage transformer (1) output is converted by secondary voltage signal conversion circuit (5) after output transform, one termination bus of the primary winding of electronic type voltage transformer (1), another bus of another termination of the primary winding of electronic type voltage transformer (1), the secondary current signal output part connecting secondary current signal translation circuit (7) of electronic current mutual inductor (6), the secondary current signal after the secondary current signal of electronic current mutual inductor (6) output is converted by secondary current signal conversion circuit (7) after output transform, described rectification filtering voltage stabilizing circuit (4B) is also connected with secondary current signal conversion circuit (7) and for it provides working power, described rectification filtering voltage stabilizing circuit (4B), secondary voltage signal conversion circuit (5), secondary current signal conversion circuit (7) connect respectively electronic electric energy meter (8),
One termination A phase bus of the primary winding of the electronic type voltage transformer (1) of one group of anti-ferroresonance self-power supply device of electronic combined mutual inductor, another termination B phase bus of the primary winding of this electronic type voltage transformer (1), once the connecting with A phase bus of the electronic current mutual inductor (6) of this group electronic combined mutual inductor anti-ferroresonance self-power supply device;
One termination C phase bus of the primary winding of the electronic type voltage transformer (1) of the anti-ferroresonance self-power supply device of another group electronic combined mutual inductor, another termination B phase bus of the primary winding of this electronic type voltage transformer (1), once the connecting with C phase bus of the electronic current mutual inductor (6) of this group electronic combined mutual inductor anti-ferroresonance self-power supply device.
2. the self-powered 2PT phase three-wire three of a kind of anti-ferroresonance according to claim 1 electronic mutual inductor proportioning device of high voltage electric energy, it is characterized in that described damping resistance (2) adopts linear resistance, the primary winding of described energy supply transformer (3) to have the two ends that are connected in parallel on electronic type voltage transformer (1) primary winding after one end series connection linear resistance at least.
3. the self-powered 2PT phase three-wire three of a kind of anti-ferroresonance according to claim 1 electronic mutual inductor proportioning device of high voltage electric energy, it is characterized in that described damping resistance (2) adopts posistor, the primary winding of described energy supply transformer (3) to have the two ends that are connected in parallel on electronic type voltage transformer (1) primary winding after one end series connection posistor at least.
4. the self-powered 2PT phase three-wire three of a kind of anti-ferroresonance according to claim 1 electronic mutual inductor proportioning device of high voltage electric energy, it is characterized in that described damping resistance (2) adopts the resistance in series of posistor and linear resistance composition, the primary winding of described energy supply transformer (3) has at least one end to connect to be connected in parallel on the two ends of electronic type voltage transformer (1) primary winding after described resistance in series.
5. the self-powered 2PT phase three-wire three of a kind of anti-ferroresonance according to claim 1 electronic mutual inductor proportioning device of high voltage electric energy, it is characterized in that described damping resistance (2) adopts the parallel resistance of posistor and linear resistance composition, the primary winding of described energy supply transformer (3) has at least one end to connect to be connected in parallel on the two ends of electronic type voltage transformer (1) primary winding after described parallel resistance.
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| CN201110233245.5A CN102332684B (en) | 2011-08-13 | 2011-08-13 | Ferromagnetic resonance-preventing self-powered 2PT three-phase three-wire electronic transformer high-voltage electric energy metering cabinet or metering box |
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| CN201110233245.5A CN102332684B (en) | 2011-08-13 | 2011-08-13 | Ferromagnetic resonance-preventing self-powered 2PT three-phase three-wire electronic transformer high-voltage electric energy metering cabinet or metering box |
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| CN102332684A CN102332684A (en) | 2012-01-25 |
| CN102332684B true CN102332684B (en) | 2014-12-03 |
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| CN105606887A (en) * | 2015-11-27 | 2016-05-25 | 国网湖南节能服务有限公司 | Energy consumption metering device of six-phase power supply equipment |
| CN114285178B (en) * | 2021-12-03 | 2023-08-18 | 西安交通大学 | Electromagnetic induction type magnetic energy collector based on capacitive energy storage and power lifting method |
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| CN201075119Y (en) * | 2007-03-02 | 2008-06-18 | 哈尔滨智通科技有限公司 | Three-phase multifunctional electric energy meter |
| CN101266263A (en) * | 2008-05-10 | 2008-09-17 | 珠海市华优电气技术有限公司 | Electric power metrological supervision system and supervision method |
| CN201514851U (en) * | 2009-11-04 | 2010-06-23 | 安徽翔远电力科技有限公司 | Outdoor self-excited source three-phase combined electronic transducer metering device |
| CN102024554A (en) * | 2009-09-21 | 2011-04-20 | 芮骏 | Harmonic elimination protector for electromagnetic potential transformer (PT) of three-phase electric network |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH615537A5 (en) * | 1977-03-01 | 1980-01-31 | Bbc Brown Boveri & Cie | |
| JPS583214A (en) * | 1981-06-29 | 1983-01-10 | Nissin Electric Co Ltd | Three phase connection device for combined voltage current transformer |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201075119Y (en) * | 2007-03-02 | 2008-06-18 | 哈尔滨智通科技有限公司 | Three-phase multifunctional electric energy meter |
| CN101266263A (en) * | 2008-05-10 | 2008-09-17 | 珠海市华优电气技术有限公司 | Electric power metrological supervision system and supervision method |
| CN102024554A (en) * | 2009-09-21 | 2011-04-20 | 芮骏 | Harmonic elimination protector for electromagnetic potential transformer (PT) of three-phase electric network |
| CN201514851U (en) * | 2009-11-04 | 2010-06-23 | 安徽翔远电力科技有限公司 | Outdoor self-excited source three-phase combined electronic transducer metering device |
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| JP昭58-3214A 1983.01.10 * |
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Effective date of registration: 20170614 Address after: 510000, room 22, No. 206 east slope road, Guangzhou, Guangdong, Tianhe District Patentee after: GUANGZHOU HUISHU INFOTECH CO.,LTD. Address before: 510000 unit 2414-2416, building, No. five, No. 371, Tianhe District, Guangdong, China Patentee before: GUANGDONG GAOHANG INTELLECTUAL PROPERTY OPERATION Co.,Ltd. Effective date of registration: 20170614 Address after: 510000 unit 2414-2416, building, No. five, No. 371, Tianhe District, Guangdong, China Patentee after: GUANGDONG GAOHANG INTELLECTUAL PROPERTY OPERATION Co.,Ltd. Address before: 528400 Zhongshan West Road, Guangdong, No. 5 East River Patentee before: Chen Jinyou |
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