CN104618064B - Static information monitoring method based on CRC check and device - Google Patents
Static information monitoring method based on CRC check and device Download PDFInfo
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Abstract
The static information monitoring method based on CRC check that the invention discloses a kind of, including：The every static information for obtaining protective relaying device in substation, binary data is stored as by the static information；Using the static information of storage as the information code of CRC check, corresponding cyclic redundancy check is calculated by CRC check algorithm；The cyclic redundancy check of calculating is compared with default check code；According to the comparison result, if the cyclic redundancy check and the default check code that calculate are inconsistent, the centralized control center into power grid sends alarm signal.In addition, also disclosing a kind of static information monitoring device based on CRC check.The present invention can reliably reduce the workload of equipment O＆M, improve O＆M efficiency, promote information and check accuracy, provided a strong guarantee for power network safety operation.
Description
Technical field
The present invention relates to grid equipment operation and maintenance technical field more particularly to a kind of static informations based on CRC check
Monitoring method and a kind of static information monitoring device based on CRC check.
Background technology
Currently, intelligent grid construction enters Rapid development stage.The modern information technologies such as communication, computer, control with
Traditional power technology is combined more closely, and the higher digital transformer substation of intelligence degree starts to put into operation.With change
The raising of power station synthetical automation level, interior unattended operational mode of standing are carried out extensively, and gradually low by 110kV
Voltage class station is developed to 500kV voltage levels station, is formed using District integrated control center as all changes in hinge remote monitoring area
" with a clad can " pattern of power station operation conditions.The increase of unattended station number and the increase of scale, to the O＆M energy of equipment
More stringent requirements are proposed for power.Under the premise of ensureing safety in production, reliability service, also more to pay attention to the efficiency for improving O＆M
And accuracy.
Currently, for the static information of equipment in power grid, such as definite value, open into state, alarm status, self-test state, adopts
Be still check, check item by item item by item, more people confirm method, audit process is cumbersome, and it is intuitively quick to be unfavorable for operation maintenance personnel
Ground understands the operating condition of device.Meanwhile the project artificially checked is more, occurs accidentally seeing, leaks the possibility for the human errors such as seeing
It is bigger, injure safety in production.
Invention content
Based on this, the static information monitoring method and one kind that the present invention provides a kind of based on CRC check being based on CRC check
Static information monitoring device.
A kind of static information monitoring method based on CRC check, includes the following steps：
The every static information for obtaining protective relaying device in substation, binary number is stored as by the static information
According to；
Using the static information of storage as the information code of CRC check, corresponding CRC is calculated by CRC check algorithm
Check code；
The cyclic redundancy check of calculating is compared with default check code；Wherein, the default check code is to work as relay
Every static information of protective device is in cyclic redundancy check corresponding when normal condition；
According to the comparison result, if the cyclic redundancy check and the default check code that calculate are inconsistent, to electricity
Centralized control center in net sends alarm signal.
Compared with general technology, the present invention is based on the static information monitoring methods of CRC check by the quiet of protective relaying device
State information incorporates into reflects shape in real time for a state node of device using cyclic redundancy check as the unique mark of state node
The current state of state node.When protective relaying device normal operation, every static information will not change, and cyclic redundancy check is not yet
It can change.If any one in static information changes, cyclic redundancy check can also change correspondingly.Work as cyclic redundancy check
When changing, generates alarm signal notice centralized control center's device operating status and change.
After the present invention is applied, by the O＆M efficiency for the protective relaying device that is greatly improved.Protective relaying device is carried out
When inspection, every static information need not be checked one by one again, only cyclic redundancy check need to be checked whether with numerical value when normal operation
It is consistent.The workload of equipment O＆M can be reliably reduced, O＆M efficiency is improved, information is promoted and checks accuracy, pacify for power grid
Full stable operation provides a strong guarantee.
A kind of static information monitoring device based on CRC check, including acquisition module, correction verification module, comparing module and announcement
Alert module；
The acquisition module, every static information for obtaining protective relaying device in substation, by the static letter
Breath is stored as binary data；
The correction verification module, information code of the static information as CRC check for that will store, passes through CRC check
Algorithm calculates corresponding cyclic redundancy check；
The comparing module, for the cyclic redundancy check calculated to be compared with default check code；Wherein, described
Default check code is the cyclic redundancy check corresponding when every static information of protective relaying device is in normal condition；
The alarm module is used for according to the comparison result, when the cyclic redundancy check and the default verification of calculating
When code is inconsistent, the centralized control center into power grid sends alarm signal.
Compared with general technology, the present invention is based on the static information monitoring devices of CRC check by the quiet of protective relaying device
State information incorporates into reflects shape in real time for a state node of device using cyclic redundancy check as the unique mark of state node
The current state of state node.When protective relaying device normal operation, every static information will not change, and cyclic redundancy check is not yet
It can change.If any one in static information changes, cyclic redundancy check can also change correspondingly.Work as cyclic redundancy check
When changing, generates alarm signal notice centralized control center's device operating status and change.
After the present invention is applied, by the O＆M efficiency for the protective relaying device that is greatly improved.Protective relaying device is carried out
When inspection, every static information need not be checked one by one again, only cyclic redundancy check need to be checked whether with numerical value when normal operation
It is consistent.The workload of equipment O＆M can be reliably reduced, O＆M efficiency is improved, information is promoted and checks accuracy, pacify for power grid
Full stable operation provides a strong guarantee.
Description of the drawings
Fig. 1 is that the present invention is based on the flow diagrams of the static information monitoring method of CRC check；
Fig. 2 is the system employed in one specific embodiment of static information monitoring method the present invention is based on CRC check
Architecture diagram；
Fig. 3 is that the present invention is based on the structural schematic diagrams of the static information monitoring device of CRC check.
Specific implementation mode
It is below in conjunction with the accompanying drawings and preferably real further to illustrate the effect of the technological means and acquirement of the invention taken
Example is applied, to technical scheme of the present invention, carries out clear and complete description.
Referring to Fig. 1, for the present invention is based on the flow diagrams of the static information monitoring method of CRC check.
The present invention is based on the static information monitoring methods of CRC check, include the following steps：
S101 obtains every static information of protective relaying device in substation, and the static information is stored as binary system
Data；
S102 is calculated corresponding using the static information of storage as the information code of CRC check by CRC check algorithm
Cyclic redundancy check；
The cyclic redundancy check of calculating is compared S103 with default check code；Wherein, the default check code is to work as
Every static information of protective relaying device is in cyclic redundancy check corresponding when normal condition；
S104 is according to the comparison result, if the cyclic redundancy check and the default check code that calculate are inconsistent,
Centralized control center into power grid sends alarm signal.
CRC (Cyclic Redundancy Check, cyclic redundancy check code) is most common a kind of difference in data communication
Wrong check code.It is exactly in transmitting terminal according to the positions the K to be transmitted binary code data using the CRC methods for realizing error checking and correction, with
Determining rule generates the picket code (i.e. CRC code) of a R bit check, and after being attached to data information, constitutes two newly
Total K+R of ary codes data are sent out.Whether receiving terminal then follows same rule and tests, to determine in transmission process to go out
It is wrong.This rule, is known as generator polynomial in Error control theory.
Any one code being made of bit string can be only the multinomial one of 0 and 1 value with a coefficient
One corresponds to.For example, binary number 1011, corresponding multinomial is G (x)=x3+x+1.If G (x) is that the generation of CRC check is more
Item formula, the rudimentary algorithm of CRC check are as follows：
The generator polynomial G (x) that the highest power of x is R is converted into corresponding R+1 bits；
Transmitting terminal will need the binary message code sent to move to left R, be equivalent to corresponding message polynomial C (x) × 2R；
Binary message code binary code corresponding with generator polynomial G (x) after moving to left does mould 2, and except calculating, (mould 2 removes
I.e. highest order is aligned, everybody does XOR operation), stop calculating until remainder is R；
The position vacated after R remainder direct splicings are moved to left to information code, obtains complete CRC code；
After receiving terminal receives complete CRC code, then the operation that mould 2 removes equally is done to CRC code, if remainder is 0, transmitted
Journey is correct；If not 0, then transmit process there is mistake.
Currently used CRC check has tri- kinds of CRC-8, CRC-16, CRC-32.The generation that wherein CRC-8 refers to CRC check is more
The highest power of Xiang Shizhong x is 8 namely the data type of cyclic redundancy check is a byte character string；CRC-16 refers to CRC check
The highest power of x is 16 in generator polynomial namely the data type of cyclic redundancy check is two byte character strings；CRC-32 refers to CRC
The highest power of x is 32 in the generator polynomial of verification namely the data type of cyclic redundancy check is four-byte character string；CRC-
8, the generator polynomial G (x) corresponding to tri- kinds of verification modes of CRC-16, CRC-32 is respectively：
As a preferred embodiment, described the step of obtaining every static information of protective relaying device in substation
In, the static information includes the definite value of protective relaying device, opens into state, alarm status and self-test state.
By the definite value of protective relaying device, opens and incorporated into as device into static informations such as state, alarm status, self-test states
One state node.Due to the definite value of protective relaying device, to open into state, alarm status, self-test state etc. be all with binary system
Data storage, so state node can be regarded as one section of very long bit string.According to above-mentioned CRC check principle, if
State node is regarded as to the information code of CRC check, then in the case where generator polynomial G (X) is determined, the schools CRC of existence anduniquess
Code is tested to be corresponding to it (cyclic redundancy check is to move to left the positions the R remainder obtained after R information codes and 2 division operation of generator polynomial mould), therefore
Unique mark using cyclic redundancy check as state node reflects the current state of state node in real time.
As a preferred embodiment, it is described by CRC check algorithm calculate corresponding cyclic redundancy check the step of it
Afterwards, include the following steps：
The cyclic redundancy check of calculating is sent to the centralized control center in power grid.
When protective relaying device normal operation, definite value is opened and be will not change into state, alarm status, self-test state, i.e., quiet
State information state node does not change, and cyclic redundancy check will not change.Once definite value is opened into state, alarm status, self-test shape
State any one changes, i.e. static information state node changes, then cyclic redundancy check can also change correspondingly.Therefore it can
One section of code is designed in program of device, timing scan device static information state node calculates its corresponding cyclic redundancy check,
In liquid crystal display and teletransmission to centralized control center.When cyclic redundancy check changes, generates alarm signal and notify operation maintenance personnel device
Operating status changes.
As a preferred embodiment, described the step of corresponding cyclic redundancy check is calculated by CRC check algorithm, packet
Include following steps：
Corresponding cyclic redundancy check is calculated by a kind of checking algorithm in CRC-8, CRC-16 or CRC-32.
Static information amount, checking precision and the cpu load rate for considering device, can be used CRC-8, CRC-16, CRC-
One kind in 32 3 kinds of verification modes selects to increase the applicable flexibility of the present invention as the case may be.
Referring to Fig. 2, for employed in one specific embodiment of static information monitoring method the present invention is based on CRC check
System software architecture diagram.
It is described that the cyclic redundancy check of calculating is sent to the centralized control center in power grid as a preferred embodiment
The step of, include the following steps：
The cyclic redundancy check of calculating is sent to the prudential sub-station in substation；
The cyclic redundancy check is sent to the Prudential Master in centralized control center by the prudential sub-station in substation.
Under CRC-32 modes, the data type of cyclic redundancy check is that (CRC-16 is two bytes to four-byte character string, and CRC-8 is
One byte).It is limited by station level stipulations, cyclic redundancy check can not be uploaded to monitoring backstage by device by way of conventional telemetering
And telecontrol communication machine.With reference to the mode that protective relaying device protection information is transmitted, might as well believe static information cyclic redundancy check as protection
It is sent in the content of breath.
When using IEC-103 as station level agreement, protection information is generally taken and is sent in the mode of universal classification service.It is general
Classified service data support 8 bit strings (STRING8) format in groups, therefore the four-byte character string of CRC-32 can divide in four groups of data
It send.When using IEC-61850 as station level agreement, the increase by one in mounted cast is needed to represent the DO of cyclic redundancy check, and add
It is added under the data set of protection information, is realized and sent with the calling at customer in response end.
Cyclic redundancy check can not can only be relied on and be sent to centralized control center in protection information system by telecontrol system.In substation
Protection information substation slave station control layer network on collect cyclic redundancy check deposit real-time database, then on send to Prudential Master.
Cyclic redundancy check is sent there are a defect in form with device parameter, i.e., cannot be sent in active as telemetering, is real
When refresh, can only with respond Prudential Master calling pattern it is passive on give.Even if cyclic redundancy check is changed, if main website
It does not call, can not just timely update numerical value.Therefore, it needs to open if the not open automatic-calling function of main website, and combines substation
Data volume and main station system operating load setting suitable calling time, to meet the real-time of cyclic redundancy check.
In addition, in substation, the communication between prudential sub-station and protective relaying device, no matter which kind of station level agreement, dress
The device parameter set can only also respond always calling together for substation and be sent on passive.Substation all has the function of always being called together to device timing at present,
As long as same control always calls the time together, meet the real-time of cyclic redundancy check.
As a preferred embodiment, the step of centralized control center into power grid sends alarm signal, including with
Lower step：
Telecontrol system alarm signal being sent in substation；
The alarm signal is sent to the centralized control center in power grid by the telecontrol system.
Protective relaying device timing calculates cyclic redundancy check, and the present worth in obtained last look and real-time database is compared
Right, whether both detections are consistent, and the signal of one " CRC code variation alarm " is generated if inconsistent.The signal needs band to keep, no
With detecting and automatic resetting next time, by being sent on telecontrol system to centralized control center.After operations staff receives this alarm, dress is checked
It sets definite value, open into state, alarm status, self-test state, judge whether generated variation is normal, is taken if abnormal next
Step measure, if normal then artificial involution signal.
" CRC code variation alarm " one as self-check of device signal, processing method and upload mechanism and other signals
Equally, can customer in response end calling it is passive on send and change after give in active.Telecontrol communication machine is received from station level on device
It is stored in real-time database after the alarm signal sent, then is forwarded to centralized control center.This process can be used with IEC-101 and IEC-104 associations
Telemechanical transmission mode based on view.
Compared with general technology, the present invention is based on the static information monitoring methods of CRC check by the quiet of protective relaying device
State information incorporates into reflects shape in real time for a state node of device using cyclic redundancy check as the unique mark of state node
The current state of state node.When protective relaying device normal operation, every static information will not change, and cyclic redundancy check is not yet
It can change.If any one in static information changes, cyclic redundancy check can also change correspondingly.Work as cyclic redundancy check
When changing, generates alarm signal notice centralized control center's device operating status and change.
After the present invention is applied, by the O＆M efficiency for the protective relaying device that is greatly improved.Protective relaying device is carried out
When inspection, every static information need not be checked one by one again, only cyclic redundancy check need to be checked whether with numerical value when normal operation
It is consistent.The workload of equipment O＆M can be reliably reduced, O＆M efficiency is improved, information is promoted and checks accuracy, pacify for power grid
Full stable operation provides a strong guarantee.
After the present invention is applied, by the O＆M efficiency and management mode of the protective relaying device that is greatly improved：
When to protective relaying device inspection, it is no longer necessary to it is split enter, definite value, alarm, self-test state check one by one, only need to examine
Whether consistent with numerical value when normal operation look into cyclic redundancy check.
Since the hard pressing plate of protective relaying device, soft pressing plate are not shown intuitively in centralized control center's monitoring system mostly, once
Pressing plate is moved back in miscarrying, and distant place centralized control center is difficult to find.After cyclic redundancy check, the variation of pressing plate state can trigger " CRC immediately
Code variation alarm " signal, device operating condition is grasped convenient for operations staff in time.
Protective relaying device actual motion carries out fixed value modification or pressing plate because coordinating the change of power system operating mode often
Throwing move back.The cyclic redundancy check of protective relaying device can be sorted out archive management according to different power system operating modes, when operation side
Formula changes to after protective relaying device progress end of operation, whether verification cyclic redundancy check is consistent with filing, quickly and easily really
Whether fixed operation is correct.
Referring to Fig. 3, for the present invention is based on the structural schematic diagrams of the static information monitoring device of CRC check.
The present invention is based on the static information monitoring devices of CRC check, including acquisition module 301, correction verification module 302, comparison
Module 303 and alarm module 304；
The acquisition module 301, every static information for obtaining protective relaying device in substation, by the static state
Information storage is binary data；
The correction verification module 302, information code of the static information as CRC check for that will store, passes through the schools CRC
Checking method calculates corresponding cyclic redundancy check；
The comparing module 303, for the cyclic redundancy check calculated to be compared with default check code；Wherein, institute
It is the cyclic redundancy check corresponding when every static information of protective relaying device is in normal condition to state default check code；
The alarm module 304 is used for according to the comparison result, when the cyclic redundancy check of calculating is preset with described
When check code is inconsistent, the centralized control center into power grid sends alarm signal.
Further include check code sending module as a preferred embodiment；
The check code sending module, the cyclic redundancy check for calculating the correction verification module are sent to the collection in power grid
Control center.
When protective relaying device normal operation, definite value is opened and be will not change into state, alarm status, self-test state, i.e., quiet
State information state node does not change, and cyclic redundancy check will not change.Once definite value is opened into state, alarm status, self-test shape
State any one changes, i.e. static information state node changes, then cyclic redundancy check can also change correspondingly.Therefore it can
One section of code is designed in program of device, timing scan device static information state node calculates its corresponding cyclic redundancy check,
In liquid crystal display and teletransmission to centralized control center.When cyclic redundancy check changes, generates alarm signal and notify operation maintenance personnel device
Operating status changes.
As a preferred embodiment, the correction verification module is used for through one in CRC-8, CRC-16 or CRC-32
Kind checking algorithm calculates corresponding cyclic redundancy check.
Static information amount, checking precision and the cpu load rate for considering device, can be used CRC-8, CRC-16, CRC-
One kind in 32 3 kinds of verification modes selects to increase the applicable flexibility of the present invention as the case may be.
As a preferred embodiment, the items that the acquisition module is used to obtain protective relaying device in substation are quiet
State information；
The static information includes the definite value of protective relaying device, opens into state, alarm status and self-test state.
By the definite value of protective relaying device, opens and incorporated into as device into static informations such as state, alarm status, self-test states
One state node.Due to the definite value of protective relaying device, to open into state, alarm status, self-test state etc. be all with binary system
Data storage, so state node can be regarded as one section of very long bit string.According to above-mentioned CRC check principle, if
State node is regarded as to the information code of CRC check, then in the case where generator polynomial G (X) is determined, the schools CRC of existence anduniquess
Code is tested to be corresponding to it (cyclic redundancy check is to move to left the positions the R remainder obtained after R information codes and 2 division operation of generator polynomial mould), therefore
Unique mark using cyclic redundancy check as state node reflects the current state of state node in real time.
Compared with general technology, the present invention is based on the static information monitoring devices of CRC check by the quiet of protective relaying device
State information incorporates into reflects shape in real time for a state node of device using cyclic redundancy check as the unique mark of state node
The current state of state node.When protective relaying device normal operation, every static information will not change, and cyclic redundancy check is not yet
It can change.If any one in static information changes, cyclic redundancy check can also change correspondingly.Work as cyclic redundancy check
When changing, generates alarm signal notice centralized control center's device operating status and change.
After the present invention is applied, by the O＆M efficiency for the protective relaying device that is greatly improved.Protective relaying device is carried out
When inspection, every static information need not be checked one by one again, only cyclic redundancy check need to be checked whether with numerical value when normal operation
It is consistent.The workload of equipment O＆M can be reliably reduced, O＆M efficiency is improved, information is promoted and checks accuracy, pacify for power grid
Full stable operation provides a strong guarantee.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Cannot the limitation to the scope of the claims of the present invention therefore be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (7)
1. a kind of static information monitoring method based on CRC check, which is characterized in that include the following steps：
The every static information for obtaining protective relaying device in substation, is stored as binary data by the static information and makees
For the state node of the protective relaying device；
Using the state node as the information code of CRC check, corresponding cyclic redundancy check is calculated by CRC check algorithm, will be counted
The cyclic redundancy check calculated is sent to the centralized control center in power grid；
The cyclic redundancy check of calculating is compared with default check code；Wherein, the default check code is to work as relay protection
Every static information of device is in cyclic redundancy check corresponding when normal condition；
According to the comparison result, if the cyclic redundancy check and the default check code that calculate are inconsistent, into power grid
Centralized control center send alarm signal；
The described the step of cyclic redundancy check of calculating is sent to the centralized control center in power grid includes：
The cyclic redundancy check of calculating is sent to the prudential sub-station in substation；
The prudential sub-station in substation is sent to the cyclic redundancy check as the content of protection information in centralized control center
Prudential Master；
Wherein, Prudential Master is set to cyclic redundancy check in conjunction with the system operating load of the data volume of prudential sub-station and Prudential Master
The calling time.
2. the static information monitoring method according to claim 1 based on CRC check, which is characterized in that the acquisition becomes
In power station the step of every static information of protective relaying device in, the static information include protective relaying device definite value,
It opens into state, alarm status and self-test state.
3. the static information monitoring method according to claim 1 based on CRC check, which is characterized in that described to pass through CRC
Checking algorithm calculates the step of corresponding cyclic redundancy check, includes the following steps：
Corresponding cyclic redundancy check is calculated by a kind of checking algorithm in CRC-8, CRC-16 or CRC-32.
4. the static information monitoring method according to claim 1 based on CRC check, which is characterized in that described to power grid
Interior centralized control center sends the step of alarm signal, includes the following steps：
Telecontrol system alarm signal being sent in substation；
The alarm signal is sent to the centralized control center in power grid by the telecontrol system.
5. a kind of static information monitoring device based on CRC check, which is characterized in that including acquisition module, correction verification module, comparison
Module and alarm module；
The acquisition module, every static information for obtaining protective relaying device in substation, the static information is deposited
Storage is for binary data and as the state node of the protective relaying device；
The correction verification module, for using the state node as the information code of CRC check, passing through the calculating pair of CRC check algorithm
The cyclic redundancy check answered；
The cyclic redundancy check of calculating is sent to the centralized control center in power grid by check code sending module；
The comparing module, for the cyclic redundancy check calculated to be compared with default check code；Wherein, described default
Check code is the cyclic redundancy check corresponding when every static information of protective relaying device is in normal condition；
The alarm module, for according to the comparison result, when calculating the cyclic redundancy check with the default check code not
When consistent, the centralized control center into power grid sends alarm signal；
The step of cyclic redundancy check of calculating is sent to the centralized control center in power grid by the check code sending module include：
The cyclic redundancy check of calculating is sent to the prudential sub-station in substation；
The prudential sub-station in substation is sent to the cyclic redundancy check as the content of protection information in centralized control center
Prudential Master；
Wherein, Prudential Master is set to cyclic redundancy check in conjunction with the system operating load of the data volume of prudential sub-station and Prudential Master
The calling time.
6. the static information monitoring device according to claim 5 based on CRC check, which is characterized in that the calibration mode
Block is used to calculate corresponding cyclic redundancy check by a kind of checking algorithm in CRC-8, CRC-16 or CRC-32.
7. the static information monitoring device according to claim 5 based on CRC check, which is characterized in that the acquisition mould
Block is used to obtain every static information of protective relaying device in substation；
The static information includes the definite value of protective relaying device, opens into state, alarm status and self-test state.
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| CN109298254A (en) * | 2017-07-24 | 2019-02-01 | 中华映管股份有限公司 | The detection method of display device and its static discharge phenomenon |
| CN107703422A (en) * | 2017-11-16 | 2018-02-16 | 珠海博威智能电网有限公司 | The fault recorder data processing system and method for a kind of power distribution network |
| CN109828861B (en) * | 2018-12-13 | 2019-12-06 | 国网江苏省电力有限公司电力科学研究院 | electric energy metering data verification system and method for electric power retail market |
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| CN113489794A (en) * | 2021-07-07 | 2021-10-08 | 智洋创新科技股份有限公司 | Communication interaction method for intelligent identification master station and intelligent station end equipment of transformer substation |
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| CN103809147A (en) * | 2012-11-12 | 2014-05-21 | 苏州工业园区新宏博通讯科技有限公司 | AC ammeter fault self diagnosis method |
| CN103593742A (en) * | 2013-11-29 | 2014-02-19 | 国家电网公司 | Secondary circuit configuration controlling method and system for intelligent substation |
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Effective date of registration: 20200921 Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. |