CN201247310Y - Tester for composite error of current mutual inductor - Google Patents

Tester for composite error of current mutual inductor Download PDF

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Publication number
CN201247310Y
CN201247310Y CNU2008200654250U CN200820065425U CN201247310Y CN 201247310 Y CN201247310 Y CN 201247310Y CN U2008200654250 U CNU2008200654250 U CN U2008200654250U CN 200820065425 U CN200820065425 U CN 200820065425U CN 201247310 Y CN201247310 Y CN 201247310Y
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CN
China
Prior art keywords
tester
current
card
data gathering
composite error
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.)
Expired - Lifetime
Application number
CNU2008200654250U
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Chinese (zh)
Inventor
程林
刘诣
罗先中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan NARI Ltd
Original Assignee
GUOWANG WUHAN HIGH VOLTAGE INST
Priority date (The priority date 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 date listed.)
Filing date
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Priority to CNU2008200654250U priority Critical patent/CN201247310Y/en
Application granted granted Critical
Publication of CN201247310Y publication Critical patent/CN201247310Y/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model relates to a composite error tester of a current transformer, which is characterized by comprising a preamplification signal modulating module, a quick-speed data gathering card and a portable industrial control computer, wherein the preamplification signal modulating module is connected with the data gathering card through a single-core coaxial shielding cable, and the data gathering card is connected with the portable industrial control computer through a PCI bus. Standard current and spill current in a composite error testing circuit of a transformer are respectively switched in a corresponding channel of a preamplification box, which are output to the data gathering card after passing through an amplifying and filtering and protecting circuit after conversing to voltage signals by a precision sampling resistance, and a digital gathering card outputs digital signals, and the digital signals are output after analyzing and processing by software of an host computer. The composite error tester can display signal waveforms in real time, and calculates out and outputs root mean square values of each circle of standard current and spill current.

Description

Current transformer combination misalignment tester
Technical field
The utility model is the measurement novel portable measurement mechanism that is applied to power industry Current Transformer combination misalignment and safety coefficient.
Background technology
The current transformer combination misalignment testing tool that estimated current mutual inductor quality inspection unit is adopted mostly is that two tables are directly measured or based on the simple acquisition system of C51 single-chip microcomputer framework.Existing these measuring equipment ubiquity sampling rates are low, and precision is not high, and long to the test period requirement, real-time is poor, can't show the shortcoming of dynamic waveform and instant storage mass data, are unfavorable for testing identifying that use and related side are to carrying out of studying.
Summary of the invention
For a change existing mutual inductor combination misalignment checkout equipment precision is low, real-time is poor, can't show shortcomings such as dynamic waveform and instant storage mass data, the purpose of this utility model is to develop a kind of current transformer combination misalignment tester based on the DAQ capture card, can quick and precisely must measure the mutual inductor combination misalignment, and dynamically show, storage coherent signal waveform, thereby improved measure accuracy, greatly reduce experimentation cost.
The technical solution of the utility model is: current transformer combination misalignment tester, it is characterized in that: it is made up of preposition amplification both signal condition module, fast data capture card, portable industrial pc three parts, both the signal condition module was by single core coaxial shielding cable and data acquisition card connection in preposition amplification, and data collecting card is connected with portable industrial pc by pci bus.
Aforesaid current transformer combination misalignment tester is characterized in that: data collecting card is 16 A/D conversions, the acquisition rate of 100k/s, the input of 4 tunnels analogies, corresponding gain range ± 0.1V, ± 0.2V, ± 0.5V, ± 1V, ± 2V, ± 4V, ± 10V, ± 20V.
Aforesaid current transformer combination misalignment tester is characterized in that: all measure floating ground, loop.
Beneficial effect: owing to adopted fast data capture card and portable industrial pc, used the software of Labview exploitation, so can quick and precisely must measure the mutual inductor combination misalignment, and dynamically show, storage coherent signal waveform, thereby improved measure accuracy, greatly reduce experimentation cost.
Description of drawings
Fig. 1 is the current transformer combination misalignment tester structured flowchart of the utility model embodiment.
Fig. 2 is the device connection block diagram of Fig. 1 embodiment.
Fig. 3 is the software flow pattern of Fig. 1 embodiment.
Embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
The current transformer combination misalignment tester of the utility model embodiment as shown in Figure 1, it is made up of preposition amplification both signal condition module, fast data capture card, portable industrial pc three parts, both the signal condition module was by single shaft shielded cable and data acquisition card connection in preposition amplification, and the data acquisition card connection is connected with portable industrial pc by pci bus.
Device connects as shown in Figure 2; according to GB 1208-2006 and IEC 60044-1 standard; normalized current in the current transformer metering circuit and spill current are inserted both respective channel of signal condition module of preposition amplification respectively; be converted into behind the voltage signal again through importing data collecting card after amplification filtering and the holding circuit by accurate sample resistance, export after by digital collection card output digital signal again through the upper computer software analyzing and processing.Its workflow as shown in Figure 3.
The software of measuring adopts the Labview exploitation, has combination misalignment and calculates and the current waveform playback function.Calculate outputting standard electric current and each cycle root-mean-square value of spill current.
Referring to Fig. 3, the measurement flow process of the current transformer combination misalignment tester of the utility model embodiment is as follows:
The operation upper computer software is provided with gain shift earlier and the mode of setting out; Click begins to measure, and enters the triggering waiting status, and it is bright to trigger " wait " light; When satisfying the signal generation that is provided with, instrument is gathered, in real time display waveform and the root-mean-square value that calculates each periodic signal.Testing crew is is suitably accepted or rejected according to waveform and data, obtains the combination misalignment value and the instrument safety coefficient that need.
The utility model embodiment is according to the measuring accuracy requirement to measurement of correlation 0.5% of GB 1208-2006 and IEC 60044-1 standard, leave in performance under the situation of certain nargin, determine the performance parameter of capture card: 16 A/D conversions, the acquisition rate that 100k/s is above, the input of 4 tunnels analogies.Finally we have selected the PCI4516 data collecting card, corresponding gain range ± 0.1V, ± 0.2V, ± 0.5V, ± 1V, ± 2V, ± 4V, ± 10V, ± 20V.
Normalized current and spill current are respectively by 0.1 Ω sample resistance, by preposition amplification filtering, data collecting card, provide at last 25 cycle root-mean-square valves (actual can do the continuous sampling of 0.3s, i.e. 15 cycle root-mean-square valves) of two-way electric current respectively according to request for utilization by host computer combination misalignment Survey Software.
The current transformer combination misalignment tester of present embodiment is measured composition of prime amplifier by one of portable machine.
The utility model can quick and precisely must be measured the mutual inductor combination misalignment, and dynamically shows, storage coherent signal waveform, thereby improved measure accuracy, greatly reduce experimentation cost.
The current transformer combination misalignment tester and the prior art performance of present embodiment are compared as follows:
Prior art Present embodiment
Sampling rate: Below every passage 1k/s Every path 10~100k/s is adjustable
The accuracy of measuring: 1 grade 0.5 level
The sampling minimum length: 0.5s more than 0.1s
Experimentation cost: Often damaged instrument by the ground wire counterattack; Test period is long, causes the power supply maintenance cycle short There is not ground wire counterattack problem; Reduce and test conduction time more than 40%, prolong the power supply maintenance cycle

Claims (3)

1, current transformer combination misalignment tester, it is characterized in that: it is made up of preposition amplification both signal condition module, fast data capture card, portable industrial pc three parts, both the signal condition module was by single core coaxial shielding cable and data acquisition card connection in preposition amplification, and data collecting card is connected with portable industrial pc by pci bus.
2, current transformer combination misalignment tester as claimed in claim 1 is characterized in that: data collecting card is 16 A/D conversions, the acquisition rate of 100k/s, the input of 4 tunnels analogies, corresponding gain range ± 0.1V, ± 0.2V, ± 0.5V, ± 1V, ± 2V, ± 4V, ± 10V, ± 20V.
3, current transformer combination misalignment tester as claimed in claim 1 or 2 is characterized in that: all measure floating ground, loop.
CNU2008200654250U 2008-01-23 2008-01-23 Tester for composite error of current mutual inductor Expired - Lifetime CN201247310Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU2008200654250U CN201247310Y (en) 2008-01-23 2008-01-23 Tester for composite error of current mutual inductor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2008200654250U CN201247310Y (en) 2008-01-23 2008-01-23 Tester for composite error of current mutual inductor

Publications (1)

Publication Number Publication Date
CN201247310Y true CN201247310Y (en) 2009-05-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
CNU2008200654250U Expired - Lifetime CN201247310Y (en) 2008-01-23 2008-01-23 Tester for composite error of current mutual inductor

Country Status (1)

Country Link
CN (1) CN201247310Y (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102736052A (en) * 2011-04-14 2012-10-17 上海创力集团股份有限公司 Current transformer fault self-detection apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102736052A (en) * 2011-04-14 2012-10-17 上海创力集团股份有限公司 Current transformer fault self-detection apparatus

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
ASS Succession or assignment of patent right

Owner name: STATE NETWORK ELECTRIC POWER RESEARCH INSTITUTE

Owner name: WUHAN NARI CO., LTD., STATE GRID ELECTRIC POWER RE

Free format text: FORMER OWNER: WUHAN HIGH VOLTAGE RESEARCH INSTITUTE OF STATE GRID

Effective date: 20100702

C41 Transfer of patent application or patent right or utility model
TR01 Transfer of patent right

Effective date of registration: 20100702

Address after: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143

Co-patentee after: State Grid Electric Power Research Insititute

Patentee after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute

Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143

Patentee before: Guowang Wuhan High Voltage Inst

C41 Transfer of patent application or patent right or utility model
TR01 Transfer of patent right

Effective date of registration: 20160718

Address after: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143

Patentee after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute

Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143

Patentee before: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute

Patentee before: State Grid Electric Power Research Insititute

CX01 Expiry of patent term

Granted publication date: 20090527

CX01 Expiry of patent term