CN204882848U - Photoelectric type current transformer calibration equipment based on analog quantity is applyed to secondary side - Google Patents

Photoelectric type current transformer calibration equipment based on analog quantity is applyed to secondary side Download PDF

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Publication number
CN204882848U
CN204882848U CN201520513892.5U CN201520513892U CN204882848U CN 204882848 U CN204882848 U CN 204882848U CN 201520513892 U CN201520513892 U CN 201520513892U CN 204882848 U CN204882848 U CN 204882848U
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China
Prior art keywords
current transformer
analog
module
voltage
optical current
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CN201520513892.5U
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Inventor
吴晋波
李辉
李振文
洪权
蔡昱华
李大公
李理
郭思源
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State Grid Corp of China SGCC
Hunan Electric Power Research Institute
State Grid Hunan Electric Power Co Ltd
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State Grid Corp of China SGCC
Hunan Electric Power Research Institute
State Grid Hunan Electric Power Co Ltd
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Abstract

The utility model discloses a photoelectric type current transformer calibration equipment based on analog quantity is applyed to secondary side, calibration equipment include that voltage source, telemechanical module and data signal read the module, the voltage source is used for producing the voltage analog volume that the check -up was used for the photoelectric type current transformer's of check -up smooth current sensor output signal's voltage signal is treated in the simulation, the voltage source links to each other with the telemechanical module and forms virtual measurement passageway, the telemechanical module will voltage analog volume convert the light signal to, the base mark signal that this light signal was used as the check -up is through optical fiber transmission to the photoelectric type current transformer photoelectric converter who treats the check -up. Data signal reads electric control system or electric power protection system that the module is connected for the photoelectric type current transformer photoelectric converter with treating the check -up. This photoelectric type current transformer calibration equipment based on analog quantity is applyed to secondary side easy to carry out, with low costs, the calibration accuracy is high.

Description

A kind of For The Rogowski Optical Current Transformer calibration equipment applying analog quantity based on secondary side
Technical field
The utility model belongs to electrical engineering technical field, relates to a kind of For The Rogowski Optical Current Transformer calibration equipment applying analog quantity based on secondary side.
Background technology
Along with the popularization of (spy) high voltage dc transmission technology, the application of For The Rogowski Optical Current Transformer in electric system also gets more and more.The data obtained measured by For The Rogowski Optical Current Transformer are as the most important quantity of state of (spy) D.C. high voltage transmission; participate in the computing of D.C. high voltage transmission control and scheduling co-design function directly, great on the impact of (spy) D.C. high voltage transmission safe and stable operation.If carry out DC control and protection system field-checking, more cannot avoid carrying out virtual load verification to For The Rogowski Optical Current Transformer place Measurement channel.For The Rogowski Optical Current Transformer transmission principle conventional is at present general to be made up of photocurrent sensor and optic-digital converter as shown in Figure 1, as the DOCT4000 that ABB produces.Photocurrent sensor is positioned on high-tension line, measured primary current value is converted to light signal, is transmitted through the fiber to optic-digital converter.Photocurrent sensor forms primarily of two parts, and telemechanical module and measurement module (Rogowsky coil or direct current shunt), as accompanying drawing 2, each telemechanical module and one or more measurement module connect and compose a Measurement channel.Wherein measurement module, no matter be Rogowsky coil or direct current shunt, its characteristic is all that output voltage is directly proportional to measured primary current.Telemechanical module is then that the small voltage signal exported by measurement module transforms light signal, transfers to a distant place.Optic-digital converter is positioned at and controls or protect indoor by light signal conversion digital signal, directly gives corresponding control, protective device by data network.Current For The Rogowski Optical Current Transformer opto-electronic conversion many employings proprietary protocol, and technical know-how, effectively cannot resolve light signal.Therefore the method applying light signal amount in optic-digital converter front end also cannot realize.At present can only apply current-mode analog quantity at primary side to the method that For The Rogowski Optical Current Transformer place Measurement channel applies virtual amount.But this method needs to disconnect circuit, uses the power source that can export big current, consuming time, effort, security risk are large.More important point is; by the restriction of dosage place capacity; adopt primary side to apply the method generally maximum analog quantity that can only apply equivalent specified running current size of analog quantity, the needs (maximum need 5 times of rated current) of DC control and protection system field-checking can not be met completely.
The existing method of calibration for current transformer is more, but is generally the electronic current mutual inductor for exchanging, and be the method for the electrified checkout of current mutual inductor of CN101408597A as publication number, its application number is CN200710046987; For another example application number a kind of high-tension current inductor on-line testing device disclosed in the patent of CN201120439554.3; These calibration equipments and method all cannot be applied to the current transformer of photo-electric.
Therefore, be necessary to design a kind of For The Rogowski Optical Current Transformer calibration equipment applying analog quantity based on secondary side.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of For The Rogowski Optical Current Transformer calibration equipment applying analog quantity based on secondary side, should be easy to implement based on the For The Rogowski Optical Current Transformer calibration equipment of secondary side applying analog quantity, cost is low, and calibration accuracy is high.
The technical solution of utility model is as follows:
Applying a For The Rogowski Optical Current Transformer calibration equipment for analog quantity based on secondary side, comprising voltage source, telemechanical module (for converting voltage analog to light signal), photoelectric commutator and digital signal read module; Photoelectric commutator is the photoelectric commutator that For The Rogowski Optical Current Transformer itself to be verified has; Voltage source is for generation of the voltage analog (for simulating the voltage signal of the photocurrent sensor output signal of For The Rogowski Optical Current Transformer to be verified, this voltage signal is voltage analog) of verification; Voltage source and telemechanical module are connected to form virtual measurement passage; Telemechanical module converts described voltage analog to light signal, and this light signal is transmitted through the fiber to photoelectric commutator as the reference signal of verification, and photoelectric commutator is connected with digital signal read module; The digital signal that digital signal read module exports for reading photoelectric commutator.
Described telemechanical module is identical with the model of the telemechanical module that For The Rogowski Optical Current Transformer to be verified has itself.
The scope of the output voltage of voltage source is 0-10V.
Digital signal read module is electric control system or power protection system.Namely preferably adopt existing electric control system or power protection system, unnecessary so other increase investment, other circuit or instrument and equipment need not be used in addition to read data, and cost is minimum, also most convenient.
Voltage source accuracy (i.e. precision) for generation of simulating signal is 0.01%, and resolution is 0.1mV, and fineness adjustment is 1mV.
Core idea of the present utility model applies analog quantity at For The Rogowski Optical Current Transformer secondary side, specifically comprise the following steps: (1), select the telemechanical module of same producer same model, pass through Fiber connection with on commission For The Rogowski Optical Current Transformer optic-digital converter; (2), the High-precision standard source of exportable small voltage signal and telemechanical model calling is selected to form a virtual measurement passage; (3), High-precision standard source exports the required voltage analog applied to telemechanical module; (4), telemechanical module by the light signal needed for voltage analog conversion, can be led to and transfer to optic-digital converter; (5), light signal conversion digital signal send relevant control, protective device to use by optic-digital converter.
Beneficial effect:
The For The Rogowski Optical Current Transformer calibration equipment applying analog quantity based on secondary side of the present utility model, its core applies analog quantity at For The Rogowski Optical Current Transformer secondary side, can meet the needs of DC control and protection system field-checking completely.
The utility model has following outstanding feature:
(1), wiring is simple.Without the need to carrying out dismounting to a circuit and secondary device, only by controlling or protecting the optical fiber of indoor on commission For The Rogowski Optical Current Transformer optic-digital converter front end to pull up, dosage optical fiber need be inserted, otherwise, then recover.
(2), device or equipment (as voltage source and telemechanical module) obtain conveniently.Selected telemechanical module can directly be bought from the For The Rogowski Optical Current Transformer of being entrusted by producer, and it is consistent with on commission For The Rogowski Optical Current Transformer that it carries opto-electronic conversion agreement, do not relate to technical know-how; The High-precision standard source of selected exportable small voltage signal is market-ripe equipment, and it is convenient to obtain.
(3), can applied amount large.For various For The Rogowski Optical Current Transformer, secondary side voltage corresponding to 5 times of rated current is all no more than 10V.High-precision standard source can satisfy the demands completely, namely applies the analog quantity being equal to 5 times of rated current.
(4), security risk is little.Whole dosage implementation process can control on commission For The Rogowski Optical Current Transformer optic-digital converter place or protection indoor complete, and also there will not be the situation jeopardizing the person, the big current of device security, greatly voltage in process.
(5) when adopting existing electric control system or power protection system as digital signal read module, directly can obtain reading at display interface, cost is minimum, also most convenient.This is also one of key point of the present utility model.
Accompanying drawing explanation
Fig. 1 is For The Rogowski Optical Current Transformer theory diagram;
Fig. 2 is photocurrent sensor pie graph;
Fig. 3 is the utility model one embodiment enforcement figure.
Embodiment
Below with reference to the drawings and specific embodiments, the utility model is described in further details:
Embodiment 1:
As Fig. 3, a kind of For The Rogowski Optical Current Transformer calibration equipment applying analog quantity based on secondary side, comprises voltage source, telemechanical module (for converting voltage analog to light signal), photoelectric commutator and digital signal read module;
Photoelectric commutator is the photoelectric commutator that For The Rogowski Optical Current Transformer itself to be verified has;
Voltage source is for generation of the voltage analog (for simulating the voltage signal of the photocurrent sensor output signal of For The Rogowski Optical Current Transformer to be verified, this voltage signal is voltage analog) of verification;
Voltage source and telemechanical module are connected to form virtual measurement passage;
Telemechanical module converts described voltage analog to light signal, and this light signal is transmitted through the fiber to photoelectric commutator as the reference signal of verification, and photoelectric commutator is connected with digital signal read module; The digital signal that digital signal read module exports for reading photoelectric commutator.
Described telemechanical module is identical with the model of the telemechanical module that For The Rogowski Optical Current Transformer to be verified has itself.
The scope of the output voltage of voltage source is 0-10V.
Digital signal read module is electric control system or power protection system.Namely existing electric control system or power protection system is preferably adopted.
A kind of method of calibration of For The Rogowski Optical Current Transformer, adopt the aforesaid For The Rogowski Optical Current Transformer calibration equipment applying analog quantity based on secondary side, the photocurrent sensor of the For The Rogowski Optical Current Transformer that the virtual measurement tunnels analogy consisted of voltage source and telemechanical module is to be verified, thus verification is implemented to For The Rogowski Optical Current Transformer to be verified.
Voltage source accuracy for generation of simulating signal is 0.01%, and resolution is 0.1mV, and fineness adjustment is 1mV.
If the specified detection voltage that the photocurrent sensor of For The Rogowski Optical Current Transformer to be measured exports is U, load current value is I;
Described checking procedure is:
The output voltage values in setting voltage source is u=K*U; * represent and be multiplied, K is coefficient, and K is the number between 0.5 to 5;
The output voltage of voltage source is carried in telemechanical module, obtains measured value i from the output terminal of photoelectric commutator; I and K*I is made comparisons and the error of calculation, if error is less than predetermined threshold value, be then verified, otherwise checking is not passed through.
Implementation step of the present utility model is as follows:
(1), select and the telemechanical module of on commission For The Rogowski Optical Current Transformer photocurrent sensor with producer's same model, pass through Fiber connection with on commission For The Rogowski Optical Current Transformer optic-digital converter;
(2), the High-precision standard source of exportable small voltage signal and telemechanical model calling is selected to form a virtual measurement passage;
(3), High-precision standard source exports the required voltage analog applied to telemechanical module;
(4), telemechanical module by the light signal needed for voltage analog conversion, can be transmitted through the fiber on commission For The Rogowski Optical Current Transformer optic-digital converter;
(5), the light signal from telemechanical module is converted to digital signal by commission For The Rogowski Optical Current Transformer optic-digital converter, has existing control device or the protective device of sending to read this digital signal, and the error of calculation also implements checking.
A concrete verification example is as follows:
Verifying work is carried out to certain current conversion station direct current pole bus For The Rogowski Optical Current Transformer (ABBDOCT4000 type).This current conversion station rated direct current is 3000A, and the voltage signal (i.e. specified detection voltage U) that the photocurrent sensor of corresponding For The Rogowski Optical Current Transformer exports is 1.66V.Concrete implementation step is as follows:
(1), select and ABBDOCT4000 type For The Rogowski Optical Current Transformer telemechanical module (with same producer same model to be verified), pass through Fiber connection with For The Rogowski Optical Current Transformer optic-digital converter to be verified;
(2), select output voltage range to be 0-10V, accuracy is 0.01%, and resolution is 0.1mV, and fineness adjustment is the voltage source of 1mV, and forms a virtual measurement passage with telemechanical model calling;
(3), voltage source output valve 1.66V; It is now 1 times of specified detection voltage U;
(4) For The Rogowski Optical Current Transformer optic-digital converter output digit signals 3010.3A, to be verified.This step is the output situation of the specified detection voltage U of checking 1 times.
(5), adjust voltage source and export 8.3V to; Be now 5 times of specified detection voltage U;
(6) For The Rogowski Optical Current Transformer optic-digital converter output digit signals 15021.2A, to be verified.
Verification standard: under the condition of 5 times of rated current, the error of detected value is no more than 10% (being 3000A*10%=300A herein) of load current value.
Because error is 15021-15000=21A, be less than 300A, therefore, be verified, illustrate that this For The Rogowski Optical Current Transformer is working properly.

Claims (5)

1. apply a For The Rogowski Optical Current Transformer calibration equipment for analog quantity based on secondary side, it is characterized in that, comprise voltage source, telemechanical module, photoelectric commutator and digital signal read module;
Photoelectric commutator is the photoelectric commutator that For The Rogowski Optical Current Transformer itself to be verified has;
Voltage source is for generation of the voltage analog of verification;
Voltage source and telemechanical module are connected to form virtual measurement passage;
Telemechanical module converts described voltage analog to light signal, and this light signal is transmitted through the fiber to photoelectric commutator as the reference signal of verification, and photoelectric commutator is connected with digital signal read module; The digital signal that digital signal read module exports for reading photoelectric commutator.
2. the For The Rogowski Optical Current Transformer calibration equipment applying analog quantity based on secondary side according to claim 1, it is characterized in that, described telemechanical module is identical with the model of the telemechanical module that For The Rogowski Optical Current Transformer to be verified has itself.
3. the For The Rogowski Optical Current Transformer calibration equipment applying analog quantity based on secondary side according to claim 1, it is characterized in that, the scope of the output voltage of voltage source is 0-10V.
4. the For The Rogowski Optical Current Transformer calibration equipment applying analog quantity based on secondary side according to claim 1, it is characterized in that, digital signal read module is electric control system or power protection system.
5. the For The Rogowski Optical Current Transformer calibration equipment applying analog quantity based on secondary side according to any one of claim 1-4, it is characterized in that, the voltage source accuracy for generation of simulating signal is 0.01%, and resolution is 0.1mV, and fineness adjustment is 1mV.
CN201520513892.5U 2015-07-15 2015-07-15 Photoelectric type current transformer calibration equipment based on analog quantity is applyed to secondary side Active CN204882848U (en)

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Application Number Priority Date Filing Date Title
CN201520513892.5U CN204882848U (en) 2015-07-15 2015-07-15 Photoelectric type current transformer calibration equipment based on analog quantity is applyed to secondary side

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105068033A (en) * 2015-07-15 2015-11-18 国家电网公司 Verification device for photoelectric current transformer and method thereof
CN105467348A (en) * 2015-12-22 2016-04-06 云南电网有限责任公司电力科学研究院 Data acquisition system, virtual verification system and method for fiber current transformer
CN105629192A (en) * 2016-03-14 2016-06-01 国家电网公司 Zero-flux current transformer calibration device and method
CN105823947A (en) * 2016-05-04 2016-08-03 国家电网公司 High voltage direct current protection system field calibration method and device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105068033A (en) * 2015-07-15 2015-11-18 国家电网公司 Verification device for photoelectric current transformer and method thereof
CN105068033B (en) * 2015-07-15 2017-12-15 国家电网公司 The calibration equipment and its method of a kind of The Rogowski Optical Current Transformer
CN105467348A (en) * 2015-12-22 2016-04-06 云南电网有限责任公司电力科学研究院 Data acquisition system, virtual verification system and method for fiber current transformer
CN105629192A (en) * 2016-03-14 2016-06-01 国家电网公司 Zero-flux current transformer calibration device and method
CN105823947A (en) * 2016-05-04 2016-08-03 国家电网公司 High voltage direct current protection system field calibration method and device
CN105823947B (en) * 2016-05-04 2018-07-10 国家电网公司 A kind of high voltage direct current protection system for field method of calibration and device

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