CN103645454A - Method for checking polarities of direct current measurement device in direct current transmission system - Google Patents
Method for checking polarities of direct current measurement device in direct current transmission system Download PDFInfo
- Publication number
- CN103645454A CN103645454A CN201310692383.9A CN201310692383A CN103645454A CN 103645454 A CN103645454 A CN 103645454A CN 201310692383 A CN201310692383 A CN 201310692383A CN 103645454 A CN103645454 A CN 103645454A
- Authority
- CN
- China
- Prior art keywords
- current
- measurement equipment
- current measurement
- polarity
- direct current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention relates to a method for checking polarities of direct current measurement devices in a direct current transmission system. The method includes the steps: serially connecting the direct current measurement devices in direct current circuits with the same polarity by a lead, and serially connecting direct current signal generators into a circuit formed by the direct current measurement devices to form a closed-loop current circuit; injecting direct current outputted by the direct current signal generators into the closed-loop current circuit, checking the polarities of all the direct current measurement devices according to observed output results of the direct current circuits and direct current protection devices on man-machine interfaces of the direct current measurement devices, turning off the direct current signal generators, and restoring the connected relation of the devices in original direct current circuits. The polarities of all the direct current measurement devices can be checked by injecting the current once, differential is checked by the direct current protection devices, and polarity checking accuracy is improved, so that the method can be widely applied to the direct current transmission system.
Description
Technical field
The present invention relates to the method for calibration of equipment in a kind of DC transmission system, particularly about the method for calibration of DC current measurement equipment polarity in a kind of DC transmission system.
Background technology
At present; converter valve two ends in HVDC (High Voltage Direct Current) transmission system, direct current utmost point bus bar side, DC bus bar side and AC line trackside have all been installed DC current measurement equipment, and its output is for DC power control, converter valve protection, DC bus protection, the protection of DC line and DC line protection etc.The direction of the DC current being obtained by DC current measurement device measuring is called polarity; if the direction of DC current measurement device measuring is identical with the direction of actual current in DC loop in DC transmission system; the polarity of DC current measurement equipment is correct; the control protective unit of all use DC current measurement equipment outputs all can normally be worked, otherwise will cause, controls the serious consequences such as function is undesired, protection action is incorrect.
It is the test that DC current measurement equipment and control protective unit must carry out after completing in installation, wiring that the polarity of DC current measurement equipment is carried out to verification.In the process of construction of existing high voltage direct current transmission project, mainly by single DC current measurement equipment being carried out to beam test and checking that whether the polarity of DC current of its output is correct, as Fig. 1, shown in Fig. 2, in prior art, the formation of DC transmission system at least comprises two AC system 1, four converter power transformers 2, four converter valve 3, four smoothing reactors 4 and some DC current measurement equipment 5, need to carry out respectively verification to each DC current measurement equipment 5 in DC transmission system, specifically comprise the following steps: 1. disconnect being connected of DC current measurement equipment 5 and other equipment.2. the DC current measurement equipment 5 disconnecting is connected with DC current signal generator 6.3. start DC current signal generator 6, the polarity of the DC current of DC current measurement equipment 5 outputs of series connection with it is carried out to verification.4. repeating step 1.～3., until the DC current measurement equipment 5 in DC transmission system is all completed to verification.Owing to there is a plurality of DC current measurement equipment in HVDC (High Voltage Direct Current) transmission system, available technology adopting is carried out respectively beam test method to each DC current measurement equipment will expend a large amount of human and material resources and time.
Summary of the invention
For the problems referred to above, the method of calibration that the object of this invention is to provide DC current measurement equipment polarity in a kind of DC transmission system of saving human and material resources and time, the method by primary side feeding current test can verification DC loop in the polarity of all DC current measurement equipment.
For achieving the above object, the present invention takes following technical scheme: the method for calibration of DC current measurement equipment polarity in a kind of DC transmission system, and it comprises the following steps: 1) DC transmission system that comprises AC system, converter power transformer, converter valve, smoothing reactor and some DC current measurement equipment is set; 2) disconnect DC current measurement equipment with in DC transmission system except direct current protecting device being connected of other equipment, and with wire, each DC current measurement equipment in same utmost point DC loop is connected; 3) DC current signal generator is connected in the loop of each DC current measurement equipment formation, forms closed loop current loop; 4) start DC current signal generator, and the DC current of DC current signal generator output is injected to closed loop current loop; 5), according to observation station records in the man-machine interface of DC current measurement equipment DC current and the Output rusults of direct current protecting device, judge that whether the polarity of DC current measurement equipment and DC current measurement equipment or its mode of connection be correct; 6) polarity of all DC current measurement equipment is completed after verification, the output of DC current signal generator is decreased to zero and close DC current signal generator; 7) remove the wire between each DC current measurement equipment and between DC current measurement equipment and DC current signal generator, recover the annexation of each equipment in former DC loop.
In described step 5), judge that whether the polarity of DC current measurement equipment and DC current measurement equipment or its mode of connection be correct, it specifically comprises the following steps: the output current of each DC current measurement equipment in (1) closed loop current loop all transfers in the man-machine interface with each DC current measurement equipment connection, and the output current that forms two above DC current measurement equipment of differential protection in the DC loop of DC transmission system all transfers in direct current protecting device; (2) judge that whether the direction of the DC current observing in the man-machine interface of DC current measurement equipment is identical with the direction of actual current in DC loop in DC transmission system; If the direction of the DC current observing is identical with the direction of actual current in DC loop in DC transmission system, illustrate that the polarity of DC current measurement equipment is correct, execution step (3) in the man-machine interface of each DC current measurement equipment; If the direction of the DC current observing in the man-machine interface of each DC current measurement equipment is not identical with the direction of actual current in DC loop in DC transmission system, the polarity that DC current measurement equipment is described is incorrect, corrigendum DC current measurement equipment or its mode of connection, again the polarity of the DC current measurement equipment after corrigendum is carried out to verification, until the whole correct rear execution steps of the polarity of each DC current measurement equipment (3); (3), according to the Output rusults of direct current protecting device, judge that whether DC current measurement equipment or its mode of connection be correct; If direct current protecting device output 0, judges that DC current measurement equipment or its mode of connection are correct, complete the verification to all DC current measurement equipment polarity, close DC current signal generator; If direct current protecting device output 1; the mode of connection of DC current measurement equipment is incorrect; after the mode of connection of corrigendum DC current measurement equipment, again the polarity of the DC current measurement equipment after corrigendum is carried out to verification; until each DC current measurement equipment or its mode of connection all correct after; complete the verification to all DC current measurement equipment polarity, close DC current signal generator.
In described step 4), the output current value of controlling DC current signal generator is greater than the minimum current value of each DC current measurement recognition of devices.
In described step 5), direct current protecting device comprises subtracter and comparer, and the DC current of two above DC current measurement equipment transfers to subtracter and calculates, and result of calculation and default reference value compare, if result of calculation is less than reference value, comparer output 0; Otherwise, comparer output 1.
The present invention is owing to taking above technical scheme, it has the following advantages: 1, the present invention is owing to DC current signal generator being connected in the loop of each DC current measurement equipment formation, and the DC current of DC current signal generator output is injected to closed loop current loop, whether the polarity that judges DC current measurement equipment by the DC current that in the man-machine interface at DC current measurement equipment, observation station records is correct, therefore the present invention tests the polarity that gets final product all DC current measurement equipment in verification DC loop by primary side feeding current, thereby save a large amount of manpowers, material resources and time.2, the present invention due in closed loop current loop by a direct current protective device and more than two DC current measurement devices in series; further by observe the differential amount of more than two DC current of DC current measurement equipment output on direct current protecting device; whether the polarity that judges DC current measurement equipment is correct, so the present invention can improve the accuracy of DC current measurement equipment polarity verification.
Accompanying drawing explanation
Fig. 1 is the structural representation of DC transmission system
Fig. 2 is the equipment connecting relation schematic diagram while adopting existing method respectively single DC current measurement equipment to be carried out to beam test
Fig. 3 is process flow diagram of the present invention
Fig. 4 is the equipment connecting relation schematic diagram while adopting method of calibration of the present invention to carry out verification to the polarity of DC current measurement equipment
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
In DC transmission system of the present invention, the method for calibration of DC current measurement equipment polarity realizes based on DC transmission system, as shown in Figure 1, DC transmission system comprises two AC system 1, four converter power transformers 2, four converter valve 3, four smoothing reactors 4 and some DC current measurement equipment 5.Wherein, two AC system 1 connect converter valve 3 by converter power transformer 2 respectively, and converter valve 3 is connected with DC current measurement equipment 5 with smoothing reactor 4 respectively; Two groups of DC loop that consist of two converter valve 3 and some DC current measurement equipment 5 are respectively the utmost point one DC line and the utmost point two DC line.
As shown in Figure 3, in DC transmission system of the present invention, the method for calibration of DC current measurement equipment polarity comprises the following steps:
1) DC transmission system that comprises AC system 1, converter power transformer 2, converter valve 3, smoothing reactor 4 and some DC current measurement equipment 5 is set.
2) as shown in Figure 4, disconnect being connected of other equipment such as DC current measurement equipment 5 and converter valve 3, smoothing reactor 4, and with wire, each DC current measurement equipment 5 in same utmost point DC loop is connected.If by connections such as pipe mother or wires, keep the connection between each DC current measurement equipment 5 between each DC current measurement equipment 5.
3) as shown in Figure 4, DC current signal generator 6 is connected in the loop of each DC current measurement equipment 5 formations, forms closed loop current loop.
4) start DC current signal generator 6 and make it output current, the output current value of DC current signal generator 6 is greater than the discernible minimum current value of each DC current measurement equipment 5.
5) the basis DC current that observation station records in the man-machine interface of DC current measurement equipment 5 and the Output rusults of direct current protecting device 7, judge that whether the polarity of DC current measurement equipment 5 is correct, and it specifically comprises the following steps:
(1) output current of each DC current measurement equipment 5 in closed loop current loop all transfers in the man-machine interface (not shown) being connected with each DC current measurement equipment 5, and the output current that forms two above DC current measurement equipment 5 of differential protection in the DC loop of DC transmission system all transfers in direct current protecting device 7.
(2) judge that whether the direction of the DC current observing in the man-machine interface of DC current measurement equipment 5 is identical with the direction of actual current in DC loop in DC transmission system;
If the direction of the DC current observing in the man-machine interface of each DC current measurement equipment 5 is identical with the direction of actual current in DC loop in DC transmission system in DC loop in DC transmission system, the polarity that DC current measurement equipment 5 is described is correct, execution step (3);
If the direction of the DC current observing in the man-machine interface of each DC current measurement equipment 5 is not identical with the direction of actual current in DC loop in DC transmission system, the polarity that DC current measurement equipment 5 is described is incorrect, corrigendum DC current measurement equipment 5 or its mode of connection, execution step 2)～5), until the whole correct rear execution steps of the polarity of each DC current measurement equipment 5 (3).
(3) according to the Output rusults of direct current protecting device 7 outputs, judge that whether DC current measurement equipment 5 or its mode of connection be correct;
If 7 outputs 0 of direct current protecting device, judge that DC current measurement equipment 5 or its mode of connection are correct, execution step 6);
If direct current protecting device 7 outputs 1; the mode of connection of DC current measurement equipment 5 is incorrect; repeating step 2 after the mode of connection of corrigendum DC current measurement equipment 5)～5), until each DC current measurement equipment 5 or its mode of connection are all correctly rear, perform step 6).
6), after the polarity verification of all DC current measurement equipment 5 completes, the output of DC current signal generator 6 is decreased to zero and close DC current signal generator 6.
7) remove the wire between each DC current measurement equipment 5 and between DC current measurement equipment 5 and DC current signal generator 6, recover the annexation of each equipment in former DC loop.
Above-mentioned steps 5) in, direct current protecting device 7 comprises subtracter 71 and comparer 72, the DC current of two above DC current measurement equipment 5 transfers to and in subtracter 71, calculates the differential amount of DC current, and the differential amount of the DC current calculating and default reference value are compared, if the differential amount of DC current is less than reference value, comparer 72 outputs 0; Otherwise, comparer 72 outputs 1.
The various embodiments described above are only for illustrating the present invention; wherein the structure of each parts, connected mode and method step etc. all can change to some extent; every equivalents of carrying out on the basis of technical solution of the present invention and improvement, all should not get rid of outside protection scope of the present invention.
Claims (5)
1. a method of calibration for DC current measurement equipment polarity in DC transmission system, it comprises the following steps:
1) DC transmission system that comprises AC system, converter power transformer, converter valve, smoothing reactor and some DC current measurement equipment is set;
2) disconnect DC current measurement equipment with in DC transmission system except direct current protecting device being connected of other equipment, and with wire, each DC current measurement equipment in same utmost point DC loop is connected;
3) DC current signal generator is connected in the loop of each DC current measurement equipment formation, forms closed loop current loop;
4) start DC current signal generator, and the DC current of DC current signal generator output is injected to closed loop current loop;
5), according to observation station records in the man-machine interface of DC current measurement equipment DC current and the Output rusults of direct current protecting device, judge that whether the polarity of DC current measurement equipment and DC current measurement equipment or its mode of connection be correct;
6) polarity of all DC current measurement equipment is completed after verification, the output of DC current signal generator is decreased to zero and close DC current signal generator;
7) remove the wire between each DC current measurement equipment and between DC current measurement equipment and DC current signal generator, recover the annexation of each equipment in former DC loop.
2. the method for calibration of DC current measurement equipment polarity in a kind of DC transmission system as claimed in claim 1, it is characterized in that: in described step 5), judge that whether the polarity of DC current measurement equipment and DC current measurement equipment or its mode of connection be correct, it specifically comprises the following steps:
(1) output current of each DC current measurement equipment in closed loop current loop all transfers in the man-machine interface with each DC current measurement equipment connection, and the output current that forms two above DC current measurement equipment of differential protection in the DC loop of DC transmission system all transfers in direct current protecting device;
(2) judge that whether the direction of the DC current observing in the man-machine interface of DC current measurement equipment is identical with the direction of actual current in DC loop in DC transmission system;
If the direction of the DC current observing is identical with the direction of actual current in DC loop in DC transmission system, illustrate that the polarity of DC current measurement equipment is correct, execution step (3) in the man-machine interface of each DC current measurement equipment;
If the direction of the DC current observing in the man-machine interface of each DC current measurement equipment is not identical with the direction of actual current in DC loop in DC transmission system, the polarity that DC current measurement equipment is described is incorrect, corrigendum DC current measurement equipment or its mode of connection, again the polarity of the DC current measurement equipment after corrigendum is carried out to verification, until the whole correct rear execution steps of the polarity of each DC current measurement equipment (3);
(3), according to the Output rusults of direct current protecting device, judge that whether DC current measurement equipment or its mode of connection be correct;
If direct current protecting device output 0, judges that DC current measurement equipment or its mode of connection are correct, complete the verification to all DC current measurement equipment polarity, close DC current signal generator;
If direct current protecting device output 1; the mode of connection of DC current measurement equipment is incorrect; after the mode of connection of corrigendum DC current measurement equipment, again the polarity of the DC current measurement equipment after corrigendum is carried out to verification; until each DC current measurement equipment or its mode of connection all correct after; complete the verification to all DC current measurement equipment polarity, close DC current signal generator.
3. the method for calibration of DC current measurement equipment polarity in a kind of DC transmission system as claimed in claim 1, it is characterized in that: in described step 4), the output current value of controlling DC current signal generator is greater than the minimum current value of each DC current measurement recognition of devices.
4. the method for calibration of DC current measurement equipment polarity in a kind of DC transmission system as claimed in claim 2, it is characterized in that: in described step 4), the output current value of controlling DC current signal generator is greater than the minimum current value of each DC current measurement recognition of devices.
5. the method for calibration of DC current measurement equipment polarity in a kind of DC transmission system as claimed in claim 1 or 2 or 3 or 4, it is characterized in that: in described step 5), direct current protecting device comprises subtracter and comparer, the DC current of two above DC current measurement equipment transfers to subtracter and calculates, result of calculation and default reference value compare, if result of calculation is less than reference value, comparer output 0; Otherwise, comparer output 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310692383.9A CN103645454B (en) | 2013-12-17 | 2013-12-17 | The method of calibration of DC current measurement equipment polarity in a kind of DC transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310692383.9A CN103645454B (en) | 2013-12-17 | 2013-12-17 | The method of calibration of DC current measurement equipment polarity in a kind of DC transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103645454A true CN103645454A (en) | 2014-03-19 |
| CN103645454B CN103645454B (en) | 2016-03-23 |
Family
ID=50250704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310692383.9A Active CN103645454B (en) | 2013-12-17 | 2013-12-17 | The method of calibration of DC current measurement equipment polarity in a kind of DC transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103645454B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207192A (en) * | 2014-06-24 | 2015-12-30 | 南京南瑞继保电气有限公司 | Direct-current power transmission closed-loop current control feedback method and device |
| CN109490809A (en) * | 2018-12-12 | 2019-03-19 | 威胜信息技术股份有限公司 | The unpaired calibration method of CT DC current return |
| CN116840748A (en) * | 2023-08-30 | 2023-10-03 | 国网智能电网研究院有限公司 | Polarity detection device and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004001437A1 (en) * | 2002-06-25 | 2003-12-31 | Ladislav Grno | Circuit for simultaneous testing of electricity meters with interconnected current and voltage circuits |
| WO2008075602A1 (en) * | 2006-12-18 | 2008-06-26 | Advantest Corporation | Measurement device, measurement method, calibration device, and calibration method |
| CN101504448A (en) * | 2009-03-13 | 2009-08-12 | 江苏省电力公司常州供电公司 | Integral polarity test method for current mutual inductor |
| CN101614798A (en) * | 2009-07-22 | 2009-12-30 | 天津市电力公司 | Polarity detection system of electronic transformer |
-
2013
- 2013-12-17 CN CN201310692383.9A patent/CN103645454B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004001437A1 (en) * | 2002-06-25 | 2003-12-31 | Ladislav Grno | Circuit for simultaneous testing of electricity meters with interconnected current and voltage circuits |
| WO2008075602A1 (en) * | 2006-12-18 | 2008-06-26 | Advantest Corporation | Measurement device, measurement method, calibration device, and calibration method |
| CN101504448A (en) * | 2009-03-13 | 2009-08-12 | 江苏省电力公司常州供电公司 | Integral polarity test method for current mutual inductor |
| CN101614798A (en) * | 2009-07-22 | 2009-12-30 | 天津市电力公司 | Polarity detection system of electronic transformer |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207192A (en) * | 2014-06-24 | 2015-12-30 | 南京南瑞继保电气有限公司 | Direct-current power transmission closed-loop current control feedback method and device |
| CN109490809A (en) * | 2018-12-12 | 2019-03-19 | 威胜信息技术股份有限公司 | The unpaired calibration method of CT DC current return |
| CN109490809B (en) * | 2018-12-12 | 2020-12-25 | 威胜信息技术股份有限公司 | Unpaired calibration method for CT direct current loop |
| CN116840748A (en) * | 2023-08-30 | 2023-10-03 | 国网智能电网研究院有限公司 | Polarity detection device and method |
| CN116840748B (en) * | 2023-08-30 | 2023-11-14 | 国网智能电网研究院有限公司 | Polarity detection device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103645454B (en) | 2016-03-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104333213B (en) | Guard method, equipment and system during a kind of PV arrays output overvoltage | |
| CN109582004B (en) | Intelligent detection platform | |
| EP3264550A1 (en) | Access control method for parallel direct current power supplies and device thereof | |
| CN105425107B (en) | A kind of method and its system of active power distribution network fault diagnosis and location | |
| CN105785157B (en) | Double main transformer longitudinal differential protection cyclization test methods | |
| CN109256970B (en) | MMC-MTDC transmission system monopolar grounding fault current calculation method | |
| CN112636694B (en) | Photovoltaic power generation system and method | |
| CN103605829A (en) | Equivalent model method for performing electromagnetic transient simulation on alternating current/direct current hybrid power grid | |
| CN104808653A (en) | Motor servo system additivity fault detection and fault tolerant control method based on slip form | |
| CN103645454A (en) | Method for checking polarities of direct current measurement device in direct current transmission system | |
| CN108008251A (en) | The fault distance-finding method of mixed power transmission line unknown parameters | |
| CN104659764A (en) | Earth-free power system self-adaptive current protection method free of load influence | |
| CN110516308B (en) | Corona starting electric field checking method for converter station special-shaped hardware | |
| CN101833055A (en) | Method and system for testing low pressure increase of converter valve equipment | |
| CN108169606A (en) | High voltage direct current converter system simulates live detection complexes and its detection method | |
| CN203882113U (en) | Flexible direct current transmission real-time simulation closed loop system | |
| CN103683230A (en) | Method and structure for achieving distance protection of power distribution network of power system | |
| CN104155627B (en) | Error characteristic detection method of extra high voltage capacitive voltage transformer | |
| CN105182157A (en) | Neutral point multi-point grounding detection device based on high-accuracy detection current | |
| CN104317987A (en) | Error analysis method for simulating calculation of short-circuit current | |
| CN205015427U (en) | Neutral point multipoint earthing detection device based on high accuracy testing electric current | |
| CN103795075A (en) | Phase sequence arrangement adjustment method for three-phase current unbalanced wires of transmission lines in transformer substation | |
| CN110133374B (en) | Detection circuit and power supply circuit | |
| KR101593212B1 (en) | Method for improving safety grade of electric power system based on credible accident analysis | |
| CN108155645B (en) | Closed loop judgment method and device for factory and mine power distribution network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20151125 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: State Power Economic Research Institute Applicant after: Jiangsu Electric Power Company Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: State Power Economic Research Institute |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |