CN104181491A - Device for detecting alternating current transformer and secondary circuit - Google Patents
Device for detecting alternating current transformer and secondary circuit Download PDFInfo
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- CN104181491A CN104181491A CN201410442985.3A CN201410442985A CN104181491A CN 104181491 A CN104181491 A CN 104181491A CN 201410442985 A CN201410442985 A CN 201410442985A CN 104181491 A CN104181491 A CN 104181491A
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Abstract
The invention discloses a device for detecting an alternating current transformer and a secondary circuit. The device comprises a primary current acquisition sub-device and a secondary circuit detection sub-device. Primary current data acquired by the primary current acquisition sub-device are transmitted to a main processor in a wireless communication mode, meanwhile, secondary currents and secondary terminal voltages acquired by the secondary circuit detection sub-device can also be transmitted to the main processor, operation processing is conducted on the received data through the main processor, and then the alternating current transformer and the secondary circuit are detected. It can be seen that the device can detect the alternating current transformer and the secondary circuit at the same time, a man-made communication link in the prior art is omitted, electric power accidents caused by communication errors are effectively avoided, and detection integrity and correctness of the alternating current circuit are guaranteed.
Description
Technical field
The present invention relates to electrician's detection technique field, in particular, relate to the pick-up unit of a kind of AC current transformer and secondary circuit.
Background technology
For guaranteeing integrality and the correctness in alternating current loop in transformer station, need to detect AC current transformer and secondary circuit.
At present, due to conventional professional division, by high-potting personnel, be responsible for the no-load voltage ratio of AC current transformer and polarity to test, by relay protection personnel, be responsible for AC current transformer secondary circuit wiring correctness to check.Because both exist intersection at work, therefore, the electric power accident that the mistake occurring when existence is linked up because of the two causes.Therefore, how providing the pick-up unit of a kind of AC current transformer and secondary circuit to avoid owing to linking up the electric power accident that mistake causes is those skilled in the art's technical matterss urgently to be resolved hurrily.
Summary of the invention
In view of this, the invention provides the pick-up unit of a kind of AC current transformer and secondary circuit, to solve prior art owing to linking up the problem of the electric power accident that mistake causes.
A pick-up unit for AC current transformer and secondary circuit, comprising: primary current gathers sub-device and gathers with described primary current the secondary circuit detection sub-means that sub-device communicates to connect;
Described primary current gathers sub-device and comprises:
Gather the first pincerlike current sensor of primary current;
Be electrically connected to described the first pincerlike current sensor, the synchronizing clock signals that response receives, the primary current data of the first pincerlike current sensor output described in reception current time, and to exporting the first modular converter with the primary current data of synchronous time mark after described primary current data analog to digital conversion;
Be electrically connected to described the first modular converter, the synchronizing clock signals receiving is decoded, to receiving described the first coding decoder of encoding with the primary current data of synchronous time mark;
Described secondary circuit detection sub-means comprises:
Gather the second pincerlike current sensor of secondary current;
Gather the voltage acquisition line of secondary terminals voltage;
Be electrically connected to described the second pincerlike current sensor, the secondary current of described the second pincerlike current sensor output be transformed to the current-to-voltage converter of the first sampled voltage;
Being electrically connected to described voltage acquisition line, is the voltage voltage changer of the second sampled voltage by the secondary terminals voltage transformation of described voltage acquisition line output;
Be electrically connected to described current-to-voltage converter, described voltage voltage changer respectively, the synchronizing clock signals that response receives, the second sampled voltage of the first sampled voltage of current-to-voltage converter output and the output of described voltage voltage changer described in reception current time, and to exporting the first sampled voltage with synchronous time mark after described the first sampled voltage analog to digital conversion, to exporting the second modular converter with the second sampled voltage of synchronous time mark after the second sampled voltage analog to digital conversion;
Be electrically connected to described the second modular converter and communicate to connect with described the first coding decoder, output synchronizing clock signals, and to the first sampled voltage with synchronous time mark receiving, with the second sampled voltage and the decoded primary processor that carries out calculation process with the primary current data of synchronous time mark of synchronous time mark.
Preferably, also comprise:
Be connected with described primary processor, for showing the operation result of described primary processor output and possessing the industrial computer panel of the function of entering the operating instructions.
Preferably, described primary processor comprises:
Be electrically connected to described the second modular converter, and to the first sampled voltage with synchronous time mark receiving, with the second sampled voltage of synchronous time mark and decoded primary current data with synchronous time mark, carry out the digital signal processing dsp chip of calculation process;
Be electrically connected to described dsp chip and communicate to connect with described the first coding decoder, to the primary current decoding data with synchronous time mark receiving, second coding decoder of simultaneously synchronizing clock signals of described dsp chip output being encoded.
Preferably, described primary current gathers sub-device and also comprises:
Be electrically connected to described the first coding decoder and communicate to connect with described primary processor, receive the synchronizing clock signals after the coding that described primary processor sends, and send after coding the first IO interface with the primary current data of synchronous time mark to described primary processor.
Preferably, described secondary circuit detection sub-means also comprises:
Be electrically connected to described primary processor and communicate to connect with described the first coding decoder, receive the primary current data with synchronous time mark after the coding of described the first coding decoder output, and to described the first coding decoder, send the second IO interface of the synchronizing clock signals after coding.
Preferably, described the first modular converter is arranged in the pincerlike main body of described the first pincerlike current sensor.
Preferably, described the first coding decoder is arranged in the pincerlike main body of described the first pincerlike current sensor.
Preferably, described the first converter comprises:
The first sampling thief being electrically connected to described the first pincerlike current sensor; And,
The first analog to digital converter being electrically connected to described the first sampling thief, described the first coding decoder respectively.
Preferably, described the second converter comprises:
The second sampling thief being electrically connected to described current-to-voltage converter, described voltage voltage changer respectively; And,
The second analog to digital converter being electrically connected to described the second sampling thief, described primary processor respectively.
Preferably, described industrial computer panel comprises:
Main frame, and the display screen and the keyboard that are electrically connected to described main frame respectively.
From above-mentioned technical scheme, can find out, the invention provides the pick-up unit of a kind of AC current transformer and secondary circuit, comprise that primary current gathers sub-device and secondary circuit detection sub-means, the primary current data that primary current gathers sub-device collection are sent to primary processor by communication, simultaneously, secondary current and the secondary terminals voltage of the collection of secondary circuit detection sub-means also can be sent to primary processor, thereby primary processor, by the data that receive are carried out to calculation process, is realized the detection to AC current transformer and secondary circuit.Can find out, pick-up unit provided by the invention can detect AC current transformer and secondary circuit simultaneously, therefore saved artificial communication link of the prior art, effectively avoid the electric power accident causing owing to linking up mistake, guaranteed integrality and correctness that alternating current loop is detected.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
Fig. 1 is the structural representation of the pick-up unit of the disclosed a kind of AC current transformer of the embodiment of the present invention and secondary circuit;
Fig. 2 is the structural representation of the position relationship of the disclosed a kind of pick-up unit of the embodiment of the present invention and tested AC current transformer and secondary circuit;
Fig. 3 is the structural representation of the pick-up unit of the disclosed another kind of AC current transformer of the embodiment of the present invention and secondary circuit.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the invention discloses the pick-up unit of a kind of AC current transformer and secondary circuit, to solve prior art owing to linking up the problem of the electric power accident that mistake causes.
Referring to Fig. 1, the structural representation of the pick-up unit of the disclosed a kind of AC current transformer of the embodiment of the present invention and secondary circuit, comprising: primary current gathers sub-device 10 and gathers with primary current the secondary circuit detection sub-means 20 that sub-device 10 communicates to connect;
Wherein,
Primary current gathers sub-device 10 and comprises: the first pincerlike current sensor 11, the first modular converter 12 and the first coding decoder 13.
The first pincerlike current sensor 11 pincers are on the wire of primary current collection point, for gathering primary current.
The first modular converter 12 is electrically connected to the first pincerlike current sensor 11, for responding the synchronizing clock signals receiving, receive the primary current data of pincerlike current sensor 11 outputs of current time first, and to exporting the primary current data with synchronous time mark after described primary current data analog to digital conversion.
The first coding decoder 13 is electrically connected to the first modular converter 12, for the synchronizing clock signals receiving is decoded, described in receiving, with the primary current data of synchronous time mark, encodes.
Secondary circuit detection sub-means 20 comprises: the second pincerlike current sensor 21, voltage acquisition line 22, current/voltage (A/V) transducer 23, voltage voltage (V/V) transducer 24, the second modular converter 25 and primary processor 26.
In the secondary circuit of the AC current transformer that the second pincerlike current sensor 21 pincers detect at needs, for gathering secondary current.
Voltage acquisition line 22 is connected in the secondary circuit of AC current transformer, for gathering secondary terminals voltage.
A/V transducer 23 is electrically connected to the second pincerlike current sensor 21, and A/V transducer 23 is transformed to the first sampled voltage by the secondary current of the second pincerlike current sensor 21 outputs.
Concrete, A/V transducer 23 is transformed to by the secondary current of the 0-20V of the second pincerlike current sensor 21 outputs the first sampled voltage that the second modular converter 25 can be sampled.
V/V transducer 24 is electrically connected to voltage acquisition line 22, and V/V transducer 24 is the second sampled voltage by the secondary terminals voltage transformation of voltage acquisition line 22 outputs.
Concrete, V/V transducer 24 is the second sampled voltage that the second modular converter 25 can be sampled by the AC voltage conversion of the 0-200V of voltage acquisition line 22 outputs.
The second modular converter 25 is electrically connected to A/V transducer 23, V/V transducer 24 respectively, the synchronizing clock signals that the second modular converter 25 responses receive, receive the first sampled voltage of current time A/V transducer 23 outputs and the second sampled voltage of V/V transducer 24 outputs, and to exporting the first sampled voltage with synchronous time mark after described the first sampled voltage analog to digital conversion, to exporting the second sampled voltage with synchronous time mark after the second sampled voltage analog to digital conversion.
Primary processor 26 is electrically connected to the second modular converter 25 and communicates to connect with the first coding decoder 13, primary processor 26 output synchronizing clock signals, and to the first sampled voltage with synchronous time mark receiving, carry out calculation process with the second sampled voltage of synchronous time mark and decoded primary current data with synchronous time mark.
It should be noted that, the first sampled voltage with synchronous time mark that 26 pairs of primary processors receive, with the second sampled voltage of synchronous time mark and decoded primary current data with synchronous time mark, carry out after calculation process, can obtain the input impedance of the no-load voltage ratio of AC current transformer, secondary current polarity and secondary circuit.Whether like this, by no-load voltage ratio, just can detect AC current transformer secondary wiring terminals connects correct; Whether the mode of connection that can detect AC current transformer secondary terminals by secondary current polarity meets field requirement; By secondary circuit, just can detect the integrality in loop.
Position relationship for clearer explanation pick-up unit provided by the invention and tested AC current transformer and secondary circuit, referring to Fig. 2, the structural representation of the position relationship of the disclosed a kind of pick-up unit of the embodiment of the present invention and tested AC current transformer and secondary circuit, wherein, in Fig. 2, use existing alternating current large-power source 01 in primary system, to inject primary current, alternating current large-power source 01 and wire, a primary equipment form a loop by the earth.
Concrete, the first pincerlike current sensor 11 pincers in pick-up unit 02 are on the wire of primary current collection point, in order to gather primary current.Then primary current harvester (the first pincerlike current sensor 11 is only shown in Fig. 2) arrives secondary circuit detection sub-means 20 by wireless transmission method by the primary current data transmission with synchronous time mark after coding.
In the secondary circuit of the AC current transformer that the second pincerlike current sensor 21 pincers of secondary circuit detection sub-means 20 detect at needs, in order to gather secondary current; Voltage acquisition line 22 is connected in the secondary circuit of AC current transformer, in order to gather secondary terminals voltage.
Wherein, in Fig. 2, be connected to the equivalent secondary impedance of other parts that impedance loop Z in secondary circuit represents secondary circuit.
It should be noted is that, in Fig. 2, in secondary circuit detection sub-means 20, except the second pincerlike current sensor 21 and voltage acquisition line 22 are arranged on outside, other parts are all arranged in same housing.
In summary it can be seen, in the pick-up unit of AC current transformer provided by the invention and secondary circuit, the primary current data that primary current gathers sub-device 10 collections can be sent to primary processor 26 by communication, simultaneously, secondary current and secondary terminals voltage that secondary circuit detection sub-means 20 gathers also can be sent to primary processor 26, thereby primary processor 26, by the data that receive are carried out to calculation process, is realized the detection to AC current transformer and secondary circuit.Can find out, pick-up unit provided by the invention can detect AC current transformer and secondary circuit simultaneously, therefore saved artificial communication link of the prior art, effectively avoid the electric power accident causing owing to linking up mistake, guaranteed integrality and correctness that alternating current loop is detected.
And, two pick-up units that pick-up unit provided by the invention adopts compared to existing technology, there is the features such as volume is little, lightweight, easy and simple to handle, and can be used in conjunction with various high-power sources, because pick-up unit inside has adopted wireless transmission method, therefore primary system is logical, after large electric current, can in all AC current transformer secondary circuits, test, thereby saved device and taken the time that mounting or dismounting remove, can save the supervision time of current return simultaneously.
It should be noted is that, the volume of the first pincerlike current sensor 11 in the present invention is greater than the volume of the second pincerlike current sensor 21, therefore, the first modular converter 12 and the first coding decoder 13 can be installed in the pincerlike main body of the first pincerlike current sensor 11, so that primary current gathers the volume of sub-device 10 is less.
For further optimizing the disclosed embodiment of Fig. 1, referring to Fig. 3, the structural representation of the pick-up unit of the disclosed another kind of AC current transformer of the embodiment of the present invention and secondary circuit, in conjunction with Fig. 1 and Fig. 3, also comprises: industrial computer panel 27;
Industrial computer panel 27 is connected with primary processor 26, for showing the operation result of primary processor 26 outputs and possessing the function of entering the operating instructions.
Wherein, the operation result of primary processor 26 output comprises: the input impedance of the no-load voltage ratio of AC current transformer, secondary current polarity and secondary circuit.Amplitude, phase place and the vector plot that certainly, on industrial computer panel 27, can also show primary current; The amplitude phase place of secondary current and amplitude, phase place and the vector plot of vector plot and secondary voltage, wherein, phase place be take secondary voltage as reference phase.
Therefore, if the disconnection of this current return, by observing the whether vanishing of the secondary current that shows in the display screen of industrial computer panel 27, is determined in any tie point turn-off current loop on AC current transformer secondary circuit whether completely; When tie point is again closed, by observing the secondary current showing in the display screen of industrial computer panel 27, whether revert to original size, determine whether this current return has recovered to connect.Therefore, by the different tie points in AC current transformer secondary circuit, cut-off experiment, whether the wiring of guaranteeing AC current transformer secondary circuit has the problem of misconnection, intersection.
It should be noted is that, industrial computer panel 27 comprises: main frame, and the display screen being connected with main frame respectively and keyboard.Wherein, the extraneous instruction that the content that industrial computer panel 27 shows can be received by self is controlled, and also can to the content of industrial computer panel 27 outputs, control by controlling primary processor 26.
For further optimizing the present embodiment, primary processor 26 specifically comprises: DSP (Digital Signal Process, digital signal processing) chip 261 and the second coding decoder 262;
Dsp chip 261 is electrically connected to the second modular converter 25, for to the first sampled voltage with synchronous time mark receiving, carry out calculation process with the second sampled voltage of synchronous time mark and decoded primary current data with synchronous time mark.
The second coding decoder 262 is electrically connected to dsp chip 261 and communicates to connect with the first coding decoder 13, for to the primary current decoding data with synchronous time mark receiving, the synchronizing clock signals of dsp chip 261 outputs is encoded simultaneously.
For further optimizing above-described embodiment, primary current gathers sub-device 10 and also comprises: the first IO interface 14;
The first IO interface 14 is electrically connected to the first coding decoder 13 and communicates to connect with primary processor 26, the synchronizing clock signals of the first IO interface 14 after for the coding that receives primary processor 26 and send, and the primary current data with synchronous time mark that send after coding to primary processor 26.
Equally, secondary circuit detection sub-means 20 also comprises: the second IO interface 28;
The second IO interface 28 is electrically connected to primary processor 26 and communicates to connect with the first coding decoder 13, the second IO interface 28 is for receiving the primary current data with synchronous time mark after the coding of the first coding decoder 13 output, and the synchronizing clock signals sending after coding to the first coding decoder 13.
Wherein, when primary current gathers sub-device 10 and includes the first IO interface 14 being electrically connected to the first coding decoder 13, the second IO interface 28 and the first IO interface 14 communication connections.
In the various embodiments described above, the first modular converter 12 specifically comprises: the first analog to digital converter and the first sampling thief;
The first sampling thief is electrically connected to the first pincerlike current sensor 11, for responding the synchronizing clock signals receiving, receives the primary current data of pincerlike current sensor 11 outputs of current time first;
The first analog to digital converter is electrically connected to the first sampling thief, the first coding decoder 13 respectively, for to output after primary current data analog to digital conversion with the primary current data of synchronous time mark to the first coding decoder 13.
It should be noted is that, for guaranteeing that the primary current data of the first pincerlike current sensor 11 outputs can be applicable to the first sampling thief, therefore, between the first sampling thief and the first pincerlike current sensor 11, be also connected with electric current electric current (A/A) transducer (not shown), A/A transducer is the electric current that the first sampling thief can be sampled by the primary current data transformation of the first pincerlike current sensor 11 outputs.
The second modular converter 25 specifically comprises: the second analog to digital converter and the second sampling thief;
The second sampling thief is electrically connected to A/V transducer 23, V/V transducer 24 respectively, for responding the synchronizing clock signals receiving, receives the first sampled voltage of current time A/V transducer 23 outputs and the second sampled voltage of V/V transducer 24 outputs.
The second analog to digital converter is electrically connected to the second sampling thief, primary processor 26 respectively, be used for output after described the first sampled voltage analog to digital conversion with the first sampled voltage of synchronous time mark, to exporting the second sampled voltage with synchronous time mark after the second sampled voltage analog to digital conversion.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a pick-up unit for AC current transformer and secondary circuit, is characterized in that, comprising: primary current gathers sub-device and gathers with described primary current the secondary circuit detection sub-means that sub-device communicates to connect;
Described primary current gathers sub-device and comprises:
Gather the first pincerlike current sensor of primary current;
Be electrically connected to described the first pincerlike current sensor, the synchronizing clock signals that response receives, the primary current data of the first pincerlike current sensor output described in reception current time, and to exporting the first modular converter with the primary current data of synchronous time mark after described primary current data analog to digital conversion;
Be electrically connected to described the first modular converter, the synchronizing clock signals receiving is decoded, to receiving described the first coding decoder of encoding with the primary current data of synchronous time mark;
Described secondary circuit detection sub-means comprises:
Gather the second pincerlike current sensor of secondary current;
Gather the voltage acquisition line of secondary terminals voltage;
Be electrically connected to described the second pincerlike current sensor, the secondary current of described the second pincerlike current sensor output be transformed to the current-to-voltage converter of the first sampled voltage;
Being electrically connected to described voltage acquisition line, is the voltage voltage changer of the second sampled voltage by the secondary terminals voltage transformation of described voltage acquisition line output;
Be electrically connected to described current-to-voltage converter, described voltage voltage changer respectively, the synchronizing clock signals that response receives, the second sampled voltage of the first sampled voltage of current-to-voltage converter output and the output of described voltage voltage changer described in reception current time, and to exporting the first sampled voltage with synchronous time mark after described the first sampled voltage analog to digital conversion, to exporting the second modular converter with the second sampled voltage of synchronous time mark after the second sampled voltage analog to digital conversion;
Be electrically connected to described the second modular converter and communicate to connect with described the first coding decoder, output synchronizing clock signals, and to the first sampled voltage with synchronous time mark receiving, with the second sampled voltage and the decoded primary processor that carries out calculation process with the primary current data of synchronous time mark of synchronous time mark.
2. pick-up unit according to claim 1, is characterized in that, also comprises:
Be connected with described primary processor, for showing the operation result of described primary processor output and possessing the industrial computer panel of the function of entering the operating instructions.
3. pick-up unit according to claim 1, is characterized in that, described primary processor comprises:
Be electrically connected to described the second modular converter, and to the first sampled voltage with synchronous time mark receiving, with the second sampled voltage of synchronous time mark and decoded primary current data with synchronous time mark, carry out the digital signal processing dsp chip of calculation process;
Be electrically connected to described dsp chip and communicate to connect with described the first coding decoder, to the primary current decoding data with synchronous time mark receiving, second coding decoder of simultaneously synchronizing clock signals of described dsp chip output being encoded.
4. pick-up unit according to claim 1, is characterized in that, described primary current gathers sub-device and also comprises:
Be electrically connected to described the first coding decoder and communicate to connect with described primary processor, receive the synchronizing clock signals after the coding that described primary processor sends, and send after coding the first IO interface with the primary current data of synchronous time mark to described primary processor.
5. pick-up unit according to claim 1, is characterized in that, described secondary circuit detection sub-means also comprises:
Be electrically connected to described primary processor and communicate to connect with described the first coding decoder, receive the primary current data with synchronous time mark after the coding of described the first coding decoder output, and to described the first coding decoder, send the second IO interface of the synchronizing clock signals after coding.
6. pick-up unit according to claim 1, is characterized in that, described the first modular converter is arranged in the pincerlike main body of described the first pincerlike current sensor.
7. pick-up unit according to claim 1, is characterized in that, described the first coding decoder is arranged in the pincerlike main body of described the first pincerlike current sensor.
8. pick-up unit according to claim 1, is characterized in that, described the first converter comprises:
The first sampling thief being electrically connected to described the first pincerlike current sensor; And,
The first analog to digital converter being electrically connected to described the first sampling thief, described the first coding decoder respectively.
9. pick-up unit according to claim 1, is characterized in that, described the second converter comprises:
The second sampling thief being electrically connected to described current-to-voltage converter, described voltage voltage changer respectively; And,
The second analog to digital converter being electrically connected to described the second sampling thief, described primary processor respectively.
10. pick-up unit according to claim 1, is characterized in that, described industrial computer panel comprises:
Main frame, and the display screen and the keyboard that are electrically connected to described main frame respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410442985.3A CN104181491A (en) | 2014-09-02 | 2014-09-02 | Device for detecting alternating current transformer and secondary circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410442985.3A CN104181491A (en) | 2014-09-02 | 2014-09-02 | Device for detecting alternating current transformer and secondary circuit |
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| CN104181491A true CN104181491A (en) | 2014-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410442985.3A Pending CN104181491A (en) | 2014-09-02 | 2014-09-02 | Device for detecting alternating current transformer and secondary circuit |
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| CN106569078A (en) * | 2016-10-25 | 2017-04-19 | 中国电力科学研究院 | State detection method and system for secondary circuit of current transformer |
| CN107015095A (en) * | 2017-03-23 | 2017-08-04 | 中国电力科学研究院 | A kind of method and system that secondary loop of mutual inductor state is judged based on Transient Method |
| CN107942192A (en) * | 2017-10-25 | 2018-04-20 | 珠海许继电气有限公司 | A kind of controller switching equipment CT automatic test approach and system |
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Owner name: STATE GRID ZHEJIANG ELECTRIC POWER COMPANY WENZHOU Free format text: FORMER OWNER: STATE GRID ZHEJIANG ELECTRIC POWER COMPANY WENZHOU POWER SUPPLY COMPANY, STATE GRID ZHEJIANG ELECTRIC POWER COMPANY Effective date: 20150625 |
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Application publication date: 20141203 |