CN104535957A - Measuring accuracy comparison device of intelligent substation - Google Patents

Measuring accuracy comparison device of intelligent substation Download PDF

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Publication number
CN104535957A
CN104535957A CN201410741931.7A CN201410741931A CN104535957A CN 104535957 A CN104535957 A CN 104535957A CN 201410741931 A CN201410741931 A CN 201410741931A CN 104535957 A CN104535957 A CN 104535957A
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CN
China
Prior art keywords
measured
voltage
current
energy meter
electric energy
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Pending
Application number
CN201410741931.7A
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Chinese (zh)
Inventor
梁仕斌
曹敏
翟少磊
张林山
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Electric Power Research Institute of Yunnan Power Grid Co Ltd
Electric Power Research Institute of Yunnan Power System Ltd
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Electric Power Research Institute of Yunnan Power System Ltd
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Priority to CN201410741931.7A priority Critical patent/CN104535957A/en
Publication of CN104535957A publication Critical patent/CN104535957A/en
Pending legal-status Critical Current

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Abstract

The invention provides a measuring accuracy comparison device of an intelligent substation. The device comprises a reference current transformer, a reference voltage transformer, a reference electric energy meter, a to-be-measured current transformer, a to-be-measured voltage transformer, a combiner unit, a to-be-measured electric energy meter, a temperature and humidity measuring unit, a data processing unit and a host. Measuring errors and stability of the electronic transformers can be detected in real time, the electronic electric energy meters are compared with common mechanical electric energy meters to determine uniformity, a common electric energy metering system is compared with a digital electric energy metering system to determine uniformity, and the change rule of the errors affected by temperature and humidity environments is measured through data analysis.

Description

A kind of intelligent substation measurement accuracy compare device
Technical field
The present invention relates to digitalized electric energy metering system technical field, refer to a kind of intelligent substation measurement accuracy compare device especially.
Background technology
Electronic mutual inductor is extremely important primary equipment in intelligent substation, electronic mutual inductor has the plurality of advantages such as insulating property are good, volume mass is little, safety and environmental protection, transient characterisitics are good, wide frequency range, antijamming capability are strong, is the developing direction of mutual inductor technology.Through to study for a long period of time both at home and abroad and try out, current electronic mutual inductor enters practical stage, and electronic mutual inductor extensively operates in all types of electrical power trans mission/distribution system.At present, the domestic existing electronic mutual inductor dissimilar more than 1000 covers runs on the transformer station of 35kV ~ 500kV electric pressure, for the research and development of electronic mutual inductor, manufacture, application have accumulated abundant on-site experience.
Although electronic mutual inductor advantages, operating experience for many years shows that electronic mutual inductor also exists many deficiencies, particularly fluctuation of service, reliability is low.Electronic mutual inductor divides active and passive two classes, and the deficiency that two electron-like formula mutual inductors exist mainly comprises:
1) active electronic transformer exists:
The electronic devices and components such as signal gathering unit and feed circuit thereof are arranged in high-pressure side, are in high voltage, the strong jamming of big current and hot environment, propose very high requirement to the interference free performance of electronic circuit and components and parts and life-span;
Signal gathering unit and feed circuit are in high-pressure side, cannot direct ground connection, are in electric potential floating state, require harsh to the Anti-interference Design of electronic circuit;
The high power laser power supply cost of powering for signal gathering unit is high, and serviceable life is generally not long;
Laser Power Devices easily cause the abnormal output of electronic mutual inductor when energy coil switches power supply with getting.
2) active electronic type instrument transformer exists:
Technical barrier in the long-time stability, sensing head assembling, weak signal modulation /demodulation, temperature drift, vibration displacement etc. of optical material is broken through not yet comprehensively, and trial run effect is not very good.
In addition, for the measurement instrument that the electric energy meter in the electric power meter of trade settlement, metering mutual inductor are examined and determine as state compulsion, " Measurement Law of the People's Republic of China " and supporting law thereof, regulation have strict administrative provisions, and relevant country, Technical specifications also have clear and definite technical requirement to electric energy meter, metering mutual inductor, metering secondary.At present, the electric power meter widespread use in digital transformer substation formed with electronic mutual inductor and Pure numerical form electric energy meter, its not yet measured supervision department of metering legitimacy and vast electric power enterprise, power consumer are approved; In the whole system of digital electric power meter, many links (as: collector, merge cells, electric energy meter etc.) can be modified to data by software, and lack empirical analysis and the technology contrast of long-term actual motion, technological accumulation is not enough, and the confidence level of the metric results of digital electric power meter, fairness, fairness are under suspicion.
On the other hand, at present both at home and abroad not yet systematically contrastive analysis was carried out to the long-term measurement accuracy of electronic mutual inductor, Pure numerical form electric energy meter and electromagnetic transformer, conventional electric energy meter, stability.The present situation caused is:
Lack based on electronic mutual inductor and the measurement of Pure numerical form electric energy meter and the technique standard and criterion of metering system;
Without ready patterns to follow, the long-term measurement accuracy of measurement instrument, stability are still to be tested for the detection of the accurate performance of measurement instrument, calibrating;
The technical requirement of detection and testing equipment is lack of standardization, and equipment interoperability is poor.
Therefore, the research carrying out the measurement accuracy of mutual inductor and operational reliability is significant.
Summary of the invention
The present invention proposes a kind of intelligent substation measurement accuracy compare device, can examine accuracy of measurement and the stability of digital electric power meter for a long time, catches the transient measurement defect that digital electric power meter may exist.
Technical scheme of the present invention is achieved in that
A kind of intelligent substation measurement accuracy compare device, comprising:
Reference current mutual inductor and reference voltage mutual inductor, for witness mark electric current and reference voltage;
With reference to electric energy meter, for obtaining with reference to electric flux according to described reference current and reference voltage;
Current transformer to be measured and voltage transformer (VT) to be measured, for measuring electric current to be measured and voltage to be measured;
Combiner unit, for becoming digital signal by electric current to be measured with voltage transitions to be measured;
Electric energy meter to be measured, the digital signal for obtaining according to combiner cell translation obtains electric flux to be measured;
Temperature and humidity measurement unit, for the humiture information of environment residing for witness mark current transformer, reference voltage mutual inductor, current transformer to be measured and voltage transformer (VT) to be measured;
Data processing unit, by reference current and electric current to be measured, reference voltage and voltage to be measured, obtain stability and the measuring error information of current transformer to be measured, voltage transformer (VT) to be measured and electric energy meter to be measured with reference to the contrast of electric flux and electric flux to be measured, humiture information;
Main frame, gathers each electric current, voltage, electric flux, measuring error and stability information for a distant place; To each current transformer, voltage transformer (VT), electric energy meter carry out parameter configuration and pair time.
Further, described main frame is used for step-up error threshold value, and realizing error transfinites alarm.
Further, described reference current mutual inductor and reference voltage mutual inductor are electromagnetic transformer.
Further, described is mechanical power energy meter with reference to electric energy meter.
Further, described current transformer to be measured and voltage transformer (VT) to be measured are electronic mutual inductor.
Further, described electric energy meter to be measured is digitalized electrical energy meter.
Further, described reference current mutual inductor, reference voltage mutual inductor are connected by cable with reference between electric energy meter, data processing unit with described; Described combiner unit and pass through Fiber connection between described current transformer to be measured, voltage transformer (VT) to be measured, electric energy meter to be measured and data processing unit; Fiber connection is passed through between described data processing unit and described main frame; Described data processing unit and described electric energy meter to be measured, pass through twisted pair line connection with reference between electric energy meter and temperature and humidity measurement unit; Described temperature and humidity measurement unit and pass through twisted pair line connection between described reference current mutual inductor, reference voltage mutual inductor, current transformer to be measured and voltage transformer (VT) to be measured.
Further, described temperature and humidity measurement unit is connected by RS485 interface with described data processing unit.
Further, DL/T860-9-2 stipulations are followed in the communication of described optical fiber.
Further, DL/T645 stipulations are followed in the communication of described twisted-pair feeder.
Beneficial effect of the present invention is:
1, in actual motion environment, with electromagnetic transformer, Real-Time Monitoring is carried out to the measuring error of various types of electronic mutual inductor, the accuracy of measurement of long-term examination electronic mutual inductor and stability, catch the transient measurement defect that electronic mutual inductor may exist;
2, the metering difference of the conventional electric energy metered system of comparison and Pure numerical form electric energy metered system, the consistance of checking two kinds of metering system metric results, for the metering legitimacy demonstration of Pure numerical form electric energy metered system provides technical support;
The mechanical power energy meter of 3, comparison routine and the metering difference of digitalized electrical energy meter, the consistance of checking two kinds of measuring apparatus metric results;
4, by the Operational Data Analysis of electronic mutual inductor, the rule that its measuring error changes by the impact of environment temperature, humidity is analyzed;
5, the characteristic that the measurement accuracy studying various types of electronic mutual inductor changes with load;
6, verify that intelligent substation is except mutual inductor, combiner unit, other link (as: Optical Fiber Transmission loop, communication network) can not bring impact to measuring system accuracy.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of one embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, the intelligent substation measurement accuracy compare device in the present embodiment, comprising:
Reference current mutual inductor and reference voltage mutual inductor, for witness mark electric current and reference voltage;
With reference to electric energy meter, for obtaining with reference to electric flux according to described reference current and reference voltage;
Current transformer to be measured and voltage transformer (VT) to be measured, for measuring electric current to be measured and voltage to be measured;
Combiner unit, for becoming digital signal by electric current to be measured with voltage transitions to be measured;
Electric energy meter to be measured, the digital signal for obtaining according to combiner cell translation obtains electric flux to be measured;
Temperature and humidity measurement unit, for the humiture information of environment residing for witness mark current transformer, reference voltage mutual inductor, current transformer to be measured and voltage transformer (VT) to be measured;
Data processing unit, by reference current and electric current to be measured, reference voltage and voltage to be measured, obtain stability and the measuring error information of current transformer to be measured, voltage transformer (VT) to be measured and electric energy meter to be measured with reference to the contrast of electric flux and electric flux to be measured, humiture information;
Main frame, gathers each electric current, voltage, electric flux, measuring error and stability information for a distant place; To each current transformer, voltage transformer (VT), electric energy meter carry out parameter configuration and pair time; Described main frame is also for step-up error threshold value, and realizing error transfinites alarm.
In the present embodiment, described reference current mutual inductor and reference voltage mutual inductor are traditional electromagnetic transformer; Described is traditional mechanical power energy meter with reference to electric energy meter; Described current transformer to be measured and voltage transformer (VT) to be measured are electronic mutual inductor, as column support type electronic mutual inductor; Described electric energy meter to be measured is digitalized electrical energy meter.
Described reference current mutual inductor, reference voltage mutual inductor are connected by cable with reference between electric energy meter, data processing unit with described; Described combiner unit and pass through Fiber connection between described current transformer to be measured, voltage transformer (VT) to be measured, electric energy meter to be measured and data processing unit; Fiber connection is passed through between described data processing unit and described main frame; Described data processing unit and described electric energy meter to be measured, pass through twisted pair line connection with reference between electric energy meter and temperature and humidity measurement unit; Described temperature and humidity measurement unit and pass through twisted pair line connection between described reference current mutual inductor, reference voltage mutual inductor, current transformer to be measured and voltage transformer (VT) to be measured.
Described temperature and humidity measurement unit is connected by RS485 interface with described data processing unit.
DL/T860-9-2 stipulations are followed in the communication of described optical fiber.DL/T645 stipulations are followed in the communication of described twisted-pair feeder.
When the present embodiment uses, a circuit to be measured is installed one group of column support type electronic current mutual inductor and one group of column support type electronic type voltage transformer respectively, the output optical fiber of electronic mutual inductor is connected to same combiner unit, combiner unit follows DL/T860-9-2 stipulations, with point-to-point or network mode, sampled value is sent to digitalized electrical energy meter and data processing unit respectively.Correspondingly on this circuit to be measured allocating and measuring accurately, the electromagnetic transformer of good stability, the analog quantity that electromagnetic transformer exports accesses conventional mechanical power energy meter and data processing unit respectively.Data processing unit by RS485 interface, follows DL/T 645 stipulations, gathers digitalized electrical energy meter, the electric flux of mechanical power energy meter and real time execution parameter, simultaneously can by parameter configuration, pair time etc. information be sent to each electric energy meter.Main frame by the various information of network collection data processing unit, in the distance data processing unit, each electric energy meter are configured and pair time etc. operation, carry out various analysis, statistics, alarm and examination.
The present embodiment can detected electrons formula measurement error of transformer and stability in real time, the consistance of comparison electronic electric energy meter and conventional mechanical power energy meter, the consistance of the conventional electric energy metered system of comparison and digital electric power metering system, by data analysis measuring error by humiture environmental impact Changing Pattern etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. an intelligent substation measurement accuracy compare device, is characterized in that, comprising:
Reference current mutual inductor and reference voltage mutual inductor, for witness mark electric current and reference voltage;
With reference to electric energy meter, for obtaining with reference to electric flux according to described reference current and reference voltage;
Current transformer to be measured and voltage transformer (VT) to be measured, for measuring electric current to be measured and voltage to be measured;
Combiner unit, for becoming digital signal by electric current to be measured with voltage transitions to be measured;
Electric energy meter to be measured, the digital signal for obtaining according to combiner cell translation obtains electric flux to be measured;
Temperature and humidity measurement unit, for the humiture information of environment residing for witness mark current transformer, reference voltage mutual inductor, current transformer to be measured and voltage transformer (VT) to be measured;
Data processing unit, by reference current and electric current to be measured, reference voltage and voltage to be measured, obtain stability and the measuring error information of current transformer to be measured, voltage transformer (VT) to be measured and electric energy meter to be measured with reference to the contrast of electric flux and electric flux to be measured, humiture information;
Main frame, gathers each electric current, voltage, electric flux, measuring error and stability information for a distant place; To each current transformer, voltage transformer (VT), electric energy meter carry out parameter configuration and pair time.
2. a kind of intelligent substation measurement accuracy compare device as claimed in claim 1, is characterized in that: described main frame is used for step-up error threshold value, and realizing error transfinites alarm.
3. a kind of intelligent substation measurement accuracy compare device as claimed in claim 1, is characterized in that: described reference current mutual inductor and reference voltage mutual inductor are electromagnetic transformer.
4. a kind of intelligent substation measurement accuracy compare device as claimed in claim 1, is characterized in that: described is mechanical power energy meter with reference to electric energy meter.
5. a kind of intelligent substation measurement accuracy compare device as claimed in claim 1, is characterized in that: described current transformer to be measured and voltage transformer (VT) to be measured are electronic mutual inductor.
6. a kind of intelligent substation measurement accuracy compare device as claimed in claim 1, is characterized in that: described electric energy meter to be measured is digitalized electrical energy meter.
7. a kind of intelligent substation measurement accuracy compare device as claimed in claim 1, is characterized in that: described reference current mutual inductor, reference voltage mutual inductor are connected by cable with reference between electric energy meter, data processing unit with described; Described combiner unit and pass through Fiber connection between described current transformer to be measured, voltage transformer (VT) to be measured, electric energy meter to be measured and data processing unit; Fiber connection is passed through between described data processing unit and described main frame; Described data processing unit and described electric energy meter to be measured, pass through twisted pair line connection with reference between electric energy meter and temperature and humidity measurement unit; Described temperature and humidity measurement unit and pass through twisted pair line connection between described reference current mutual inductor, reference voltage mutual inductor, current transformer to be measured and voltage transformer (VT) to be measured.
8. a kind of intelligent substation measurement accuracy compare device as claimed in claim 1, is characterized in that: described temperature and humidity measurement unit is connected by RS485 interface with described data processing unit.
9. a kind of intelligent substation measurement accuracy compare device as claimed in claim 7, is characterized in that: DL/T860-9-2 stipulations are followed in the communication of described optical fiber.
10. a kind of intelligent substation measurement accuracy compare device as claimed in claim 7, is characterized in that: DL/T645 stipulations are followed in the communication of described twisted-pair feeder.
CN201410741931.7A 2014-12-08 2014-12-08 Measuring accuracy comparison device of intelligent substation Pending CN104535957A (en)

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CN105842644A (en) * 2016-03-23 2016-08-10 中国电力科学研究院 Electronic mutual inductor error characteristic on-line comparison and calibration device and method
CN106501763A (en) * 2017-01-05 2017-03-15 云南电网有限责任公司电力科学研究院 A kind of electric energy meter calibration method and system based on climatic simulation
CN108008337A (en) * 2017-11-08 2018-05-08 国网冀北电力有限公司电力科学研究院 The computational methods and device of electric energy meter measurement error uniformity

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CN105842644A (en) * 2016-03-23 2016-08-10 中国电力科学研究院 Electronic mutual inductor error characteristic on-line comparison and calibration device and method
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