CN102313879B - Electronic current transformer on-line checking system based on double-clamp current coil - Google Patents

Electronic current transformer on-line checking system based on double-clamp current coil Download PDF

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Publication number
CN102313879B
CN102313879B CN201110278377.XA CN201110278377A CN102313879B CN 102313879 B CN102313879 B CN 102313879B CN 201110278377 A CN201110278377 A CN 201110278377A CN 102313879 B CN102313879 B CN 102313879B
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China
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current
electronic
receiving
low
pressure
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CN201110278377.XA
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Chinese (zh)
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CN102313879A (en
Inventor
张秋雁
窦峭奇
桂专
李鹏程
肖监
欧家祥
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贵州电力试验研究院
武汉格蓝若光电互感器有限公司
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Priority to CN201110278377.XA priority Critical patent/CN102313879B/en
Publication of CN102313879A publication Critical patent/CN102313879A/en
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Abstract

The invention relates to an electronic current transformer on-line checking system based on a double-clamp current coil, comprising a checking platform which consists of a high-voltage side standard channel current transformer, a low-voltage side receiving end and an upper computer; the high-voltage side standard channel current transformer is connected with the low-voltage side receiving end through wireless transmission; the low-voltage side receiving end is connected with the upper computer through a serial signal connecting wire; and the low-voltage side receiving end is connected with an electronic current transformer to be checked through a connecting lead or an optical fiber. The electronic current transformer on-line checking system based on the double-clamp current coil judges if the installation of a standard channel current sensor meets relevant requirements through the mutual checking of two clamp current coils, so that the checking data feedback judgment of a standard current channel is formed, the controllability of on-site operation is ensured, and the high-precision electronic transformer on-line checking is realized. Simultaneously, the electronic current transformer on-line checking system based on the double-clamp current coil is based on an open frequency band wireless transmission data technology between a high-voltage side and a low-voltage side, so that a heavy optical fiber synthesizing insulator is omitted, and the on-site operation difficulty is greatly reduced.

Description

Electronic current mutual inductor on-line testing system based on two pincers type current coils
Technical field
The present invention relates to a kind of electronic mutual inductor on-line testing system based on the verification of two pincers type current coil, the on-line testing that carries out not power-off for the electronic mutual inductor that electrical network is moved.
Background technology
Mutual inductor plays the vital role that signal is provided to follow-up measurement, protection and watch-dog in transformer station, and the stability of its operation is particularly important.There is principle difference in electronic mutual inductor and traditional mutual inductor, thereby can not adopt method of calibration and the equipment of traditional mutual inductor.And traditional mutual inductor is because structure is relatively simple, technology is relatively ripe, is generally the method that adopts regular interruption maintenance verification, the time limit may for 10 years even longer.But; electronic mutual inductor has adopted a large amount of electronic devices and components or optical device; stability is subject to certain restrictions; no matter be, from electric energy metrical or the application of protection, consider; all can not adopt the method for the periodic check of traditional mutual inductor, but should to its error characteristics, carry out verification at any time when being necessary.
No matter owing to being at present that traditional mutual inductor or the verification of electronic mutual inductor all rest on the off-line verification under power down mode mostly, the effective means of under electriferous state, electronic mutual inductor performance being monitored is at the early-stage, so electronic mutual inductor on-line testing system is the new technology of urgently researching and developing.
Document (Tong Yue, Li Hong Bin.An accurate continuous calibration system for high voltage current transformer[J] .Review of Scientific Intrusments, 2011, 82 (2): the on-line testing system of 025107-025107-9) having studied a kind of electronic current mutual inductor, but have the following disadvantages: 1, current transformer standard channel has adopted pincers type air core coil, but, the measuring accuracy of pincers type air core coil is subject to the impact of installation site and the closed degree of air gap very large, owing to being charged installation, so, under installation process and the uncontrollable prerequisite of result, the measuring accuracy of air core coil is uncontrollable, be difficult to guarantee the current measurement precision of normalized current passage, to such an extent as to the confidence level of check results is under suspicion.2, the transmission of the signal between high and low pressure side has adopted optical fiber composite insulator, and optical fiber composite insulation sub-volumes is large, and Heavy Weight is not easy to on-the-spot installation.
Summary of the invention
The present invention is directed to the technological deficiency of the on-line testing system existence of above-mentioned electronic current mutual inductor, carried out technological improvement, a kind of electronic mutual inductor on-line testing system based on the verification of two pincers type current coil is proposed, by the mutual calibration of two pincers type current coils, thereby realize, standard channel current sensor is installed to whether satisfactory judgement, form the checking data feedback judgement of normalized current passage, controlled while guaranteeing execute-in-place, thus realize high-precision electronic current mutual inductor on-line testing.The present invention simultaneously adopts the technology based on open frequency range wireless transmission data between high and low pressure side, removes heavy optical fiber composite insulator from, greatly reduces the difficulty of execute-in-place.
Technical scheme of the present invention is:
Electronic mutual inductor on-line testing system based on the verification of two pincers type current coil, comprise high-pressure side standard channel current transformer, the verification platform that the receiving end of low-pressure side and host computer form, high-pressure side standard channel current transformer is connected with the receiving end of low-pressure side by wireless transmission, the receiving end of low-pressure side is connected with host computer by rs 232 serial interface signal connecting line, the receiving end of low-pressure side is by connecting wire or optical fiber and being connected by the current transformer of verification, it is characterized in that: described high-pressure side standard channel current transformer is by two pincers type current coils, signals collecting and transmitter card, battery, radome and external printing board PCB transmitting antenna form, signals collecting and transmitter card, battery is separately fixed at radome inside, battery is signals collecting and transmitter card power supply, two pincers type current coils are connected with signals collecting and transmitter card in radome by wire respectively, external PCB transmitting antenna is embedded on the pcb board of radome, two pincers type current coils, the center of radome has through hole, two pincers type current coils, radome is installed in series on the primary current wire by the same circuit of the electronic current mutual inductor of verification.The built-up coil that described two pincers type current coils are core current coil, hollow current coil or core current coil and hollow current coil, first under same current signal, the two-way output to two pincers type current coils is compared, when the difference of two-way output is less than the error limit of corresponding class of accuracy regulation, form standard channel current sensor satisfactory judgement is installed, so that being installed, satisfactory pair of pincers type current coil be output as reference frame again, according to national standard, to being carried out error calculating and verification by the electronic current mutual inductor of verification.Two pincers type current coil, signals collecting and transmitter card, batteries are all buied from market.
The receiving end that is positioned at low-pressure side receives the digital output signal of high-pressure side standard channel current transformer and sends to host computer in the mode of wireless receiving, and receiving end receives low-pressure side by the digital output signal of the electronic current mutual inductor of verification simultaneously; Host computer obtains high-pressure side standard channel current transformer and high-pressure side this two paths of signals of standard channel current transformer after the output signal of synchronization, extract respectively amplitude and the phase place of two paths of signals, according to national standard, calculate the ratio of two paths of signals and differ.
Receiving end and host computer all adopt existing equipment, high-pressure side standard channel current transformer need to be installed in series on the primary current wire of the same current return of electronic current mutual inductor by verification, and receiving end and host computer are to be placed on the positions such as low voltage control chamber, also can be placed on as required any position in the coverage of wireless transmission.
The present invention is by the mutual calibration of two pincers type current coils, thereby realize, standard channel current transformer is installed to whether satisfactory judgement, form the checking data feedback judgement of normalized current passage, controlled while guaranteeing execute-in-place, thus realize high-precision electronic mutual inductor on-line testing.The present invention simultaneously adopts the technology based on open frequency range wireless transmission data between high and low pressure side, removes heavy optical fiber composite insulator from, greatly reduces the difficulty of execute-in-place.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention.
Embodiment
The invention will be further described by reference to the accompanying drawings.
As shown in Figure 1, electronic mutual inductor on-line testing system based on the verification of two pincers type current coil, comprise high-pressure side standard channel current transformer, the verification platform that the receiving end 9 of low-pressure side and host computer 11 form, high-pressure side standard channel current transformer is connected with the receiving end 9 of low-pressure side by wireless transmission, the receiving end 9 of low-pressure side is connected with host computer 11 by rs 232 serial interface signal connecting line 12, the receiving end 9 of low-pressure side is by connecting wire or optical fiber 13 and being connected by the current transformer of verification, described high-pressure side standard channel current transformer is by two pincers type current coils (2, 3), signals collecting and transmitter card 4, battery 7, radome 6 and external printing board PCB transmitting antenna 5 form, signals collecting and transmitter card 4, battery 7 is separately fixed at radome 6 inside, battery 7 is signals collecting and transmitter card 4 power supplies, two pincers type current coils (2, 3) by wire 8, be connected with signals collecting and transmitter card 4 in radome 6 respectively, external PCB transmitting antenna 5 is embedded on the pcb board of radome 6, two pincers type current coils (2, 3), the center of radome 6 has through hole 10, two pincers type current coils (2, 3), radome 6 is installed in series on the primary current wire 1 by the same circuit of the electronic current mutual inductor of verification.The built-up coil that described two pincers type current coils are core current coil, hollow current coil or core current coil and hollow current coil, first under same current signal, the two-way output to two pincers type current coils is compared, when the difference of two-way output is less than the error limit of corresponding class of accuracy regulation, form standard channel current sensor satisfactory judgement is installed, so that being installed, satisfactory pair of pincers type current coil be output as reference frame again, according to national standard, to being carried out error calculating and verification by the electronic current mutual inductor of verification.Two pincers type current coil, signals collecting and transmitter card, batteries are all buied from market.
High-pressure side of the present invention standard channel current transformer is connected with receiving end 9 by wireless transmission, receiving end 9 is transferred to host computer 11 through serial ports, and receiving end 9 receives the numeral by the electronic current mutual inductor in school being series in same current return with standard channel current transformer simultaneously and exports and send to host computer 11.Receiving end 9 and host computer 11 all adopt existing equipment, standard channel current transformer is installed on by the same circuit of verification electronic current mutual inductor, receiving end can be placed on the positions such as low voltage control chamber, also can be placed on as required any position in the coverage of wireless transmission.
As shown in Figure 1, the concrete mounting means of the high-pressure side part of this utility model is described: opening radome, pincers type double-current coil are enclosed within by the same circuit of verification electronic current mutual inductor, and are fixed; The residing direction of a receiving end facing to comparatively open and low-pressure side of PCB antenna will be had on radome.Output signal by the electronic current mutual inductor of verification is connected to receiving end.Receiving end connects and is transferred to host computer by standard channel current transformer and by the output signal of the electronic current mutual inductor of verification again.
After installing, first to transferring to the two-way output of the lower pair of pincers type current coil of same current signal of host computer, compare, when the difference of two-way output is less than the error limit of corresponding class of accuracy regulation, can think that the installation of standard channel current sensor meets the requirements, so that being installed, satisfactory pair of pincers type current coil be output as reference frame again, according to national standard, to being carried out error calculating and verification by the current transformer of verification.When if two pincers type current coil two-way output differences are greater than the error limit of corresponding class of accuracy regulation, think that installation is undesirable, need to adjust the installation site of pincers type current coil, after retightening, repeat again above-mentioned deterministic process, until two pincers type current coil two-way output difference is less than the error limit of corresponding class of accuracy regulation.

Claims (1)

1. the electronic mutual inductor on-line testing system based on the verification of two pincers type current coil, comprise high-pressure side standard channel current transformer, the verification platform that the receiving end of low-pressure side and host computer form, high-pressure side standard channel current transformer is connected with the receiving end of low-pressure side by wireless transmission, the receiving end of low-pressure side is connected with host computer by rs 232 serial interface signal connecting line, the receiving end of low-pressure side is by connecting wire or optical fiber and being connected by the electronic current mutual inductor of verification, it is characterized in that: described high-pressure side standard channel current transformer is by two pincers type current coils, signals collecting and transmitter card, battery, radome and external printing board PCB transmitting antenna form, signals collecting and transmitter card, battery is separately fixed at radome inside, battery is signals collecting and transmitter card power supply, two pincers type current coils are connected with signals collecting and transmitter card in radome by wire respectively, external printing board PCB transmitting antenna is embedded on the printing board PCB plate of radome, two pincers type current coils, the center of radome has through hole, two pincers type current coils, radome is installed in series on the primary current wire by the same circuit of the electronic current mutual inductor of verification, described two pincers type current coils are built-up coils of core current coil and hollow current coil.
CN201110278377.XA 2011-09-19 2011-09-19 Electronic current transformer on-line checking system based on double-clamp current coil CN102313879B (en)

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Publication number Priority date Publication date Assignee Title
CN102645643A (en) * 2012-05-16 2012-08-22 贵州电力试验研究院 Online calibration system for electronic voltage transformer
WO2014194514A1 (en) * 2013-06-07 2014-12-11 国家电网公司 Heavy ac current calibration system based on self-calibration principle of coefficient of mutual induction of hollow coil
CN104502724B (en) * 2014-11-05 2017-10-13 济南鲁智电子科技有限公司 A kind of pole tower ground resistance measurement method
CN106093825B (en) * 2016-07-26 2019-08-23 中国南方电网有限责任公司电网技术研究中心 A kind of device of optical transformer fault diagnosis

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CN101762799A (en) * 2009-09-27 2010-06-30 河南电力试验研究院 Method and system for online detection of voltage transformer precision
CN102129059A (en) * 2011-01-19 2011-07-20 四川电力科学研究院 5-kA zero-track DC (Direct Current) comparator for calibrating current transformer
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