CN110133562A - A kind of Secondary Circuit of Potential Transformer pressure drop on-site test system and method - Google Patents

A kind of Secondary Circuit of Potential Transformer pressure drop on-site test system and method Download PDF

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Publication number
CN110133562A
CN110133562A CN201910266259.3A CN201910266259A CN110133562A CN 110133562 A CN110133562 A CN 110133562A CN 201910266259 A CN201910266259 A CN 201910266259A CN 110133562 A CN110133562 A CN 110133562A
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China
Prior art keywords
voltage
circuit
terminal
acquisition terminal
wireless acquisition
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CN201910266259.3A
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Chinese (zh)
Inventor
李养俊
孟劼
张强
曹森
何子春
涂伟
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Huadian Electric Power Research Institute Co Ltd
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Huadian Electric Power Research Institute Co Ltd
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Priority to CN201910266259.3A priority Critical patent/CN110133562A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0084Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the preceding groups
    • G01R35/02Testing or calibrating of apparatus covered by the preceding groups of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating

Abstract

The present invention relates to a kind of Secondary Circuit of Potential Transformer pressure drop on-site test system and method, which includes voltage transformer side wireless acquisition terminal, metering cabinet side wireless acquisition terminal and main website management server;Voltage transformer side wireless acquisition terminal measures voltage transformer terminal box secondary voltage amplitude and phase on the spot for acquiring, and connect with main website management server communication;Metering cabinet side wireless acquisition terminal measures metering cabinet secondary voltage amplitude and phase for acquiring, and connect with main website management server communication;The data record and analysis system based on Labview for carrying out data processing to voltage transformer side wireless acquisition terminal and the collected voltage magnitude of metering cabinet side wireless acquisition terminal and phase are integrated in main website management server.The test macro has the advantages that testing efficiency is high, test accuracy is high, can efficient, accurate test and measuring Secondary Circuit of Potential Transformer pressure drop.

Description

A kind of Secondary Circuit of Potential Transformer pressure drop on-site test system and method
Technical field
The present invention relates to voltage transformer detection technique fields, in particular, being related to a kind of Secondary Circuit of Potential Transformer Pressure drop on-site test system and method.
Background technique
People's Republic of China's power industry standard " electric energy metering device technical management regulation " (DL/T 448-2016) In, the test of Secondary Circuit of Potential Transformer and pressure drop to metering is made that following regulation: 1. power quality measurement fills The voltage drop of centre adjustment voltage transformer secondary circuit should be not more than the 0.2% of its rated secondary voltage;2. running mutual induction of voltage Device secondary circuit voltage drop should be verified periodically, to the Voltage Transformer Secondary Circuit Voltage Drop of 35kV or more, at least often Verification in 2 years is primary;3. being answered when secondary circuit load is more than mutual inductor rated sencondaryload or secondary circuit voltage drop is overproof It ascertains the reason, and is handled in one month in time.Period measuring need to be carried out to running Secondary Circuit of Potential Transformer pressure drop, Electric energy metering error caused by calculate thus reduces total errors of electric energy countings, reduces charging for carrying out technological improvement Lose important in inhibiting.
Error caused by voltage transformer secondary voltage drop just refers between voltage transformer secondary terminal and face terminals General name of the difference in magnitude of voltage relative to the phase difference between the percentage of secondary virtual voltage and two voltages.Voltage is mutual Sensor secondary voltage drop is directly related to the error of electrical energy measurement, is the project of the necessary periodic verification of electric system.However, practical fortune The metering device of voltage transformer distance controlling room in row generally has larger distance, and there are secondary connecting wire is longer The generalized situations of (for some 500kV substations, secondary connecting wire is up to 800m), current test job generally use city There are commonly wire type secondary pressure drop testers directly to measure on face, and traditional wired direct test method is mutual by voltage when measuring The signal of sensor side is pulled to meter side by special test cable, by the secondary voltage of voltage transformer side and measurement meter side into Row compares, and read-around ratio difference and angular difference.This method by place limitation influenced, test job carry out when need lay almost with The isometric low resistance test wire of secondary cable, it is time-consuming and laborious.Due to interim trial line withstanding compression, survey not as good as armored cable The test wire of temporary laid is also laid special stress on protecting during examination, and also the moment is applied by intersection for test process and result The influence of work, test job amount is big and testing efficiency is low.
Currently, although occurring many wireless measurement devices using the indirect method of measurement in the market, different journeys when test Realizing for degree is applied even without the state for laying interim test cable less, and voltage transformer secondary voltage drop scene is greatly saved Test beam worker when and labor workload.It can effectively be other electric secondary test job saving in the case where the duration is certain Many time margins out, and effectively evaded in the complexity of the space structures such as underground substation of more and more appearance in recent years In substation, the problem of test cable difficulty is laid.But this kind of generally existing measuring accuracy of wireless secondary voltage drop test device by Environment electromagnetics influence to survey, and test result accuracy is not high enough, are not able to satisfy the required measurement accuracy of certain accuracy metering, very Need the occasion of high precision measurement that cannot generally use in batches more.
In addition, the wireless measurement device working mechanism of mainstream is usually that single subsidiary engine cooperates single host, respectively in voltage Voltage magnitude and phase are measured at mutual inductor terminal box and metering cabinet at secondary circuit testing terminal, using wireless carrier technology or Other communication and simultaneous techniques in addition some use GPS simultaneous techniques wireless measurement device, main problem be part partially Out-of-the-way substation region is directly unable to measure without GPS signal.Even if having signal, but due to extraneous interference, the shadow of amblent air temperature The presence of the factors such as the placement position of sound, antenna still unavoidably influences accuracy of measurement.When this kind of wireless measurement device is tested Separate unit Secondary Circuit of Potential Transformer pressure drop can only be tested, more Secondary Circuit of Potential Transformer pressures can not be carried out simultaneously The test of drop, testing efficiency remain unchanged not high.And test result can not provide the comparison conclusion of same standard prescribed limits, be unfavorable for surveying Examination personnel quickly judge correct, the validity of test result.
Currently, the direct method of measurement that wired test device is widely used is led due to laying the heavy workload of interim test cable It causes testing efficiency low, and uses wireless measurement device then since measuring accuracy is unable to reach requirements, when on-the-spot test remains unchanged fortune With less.In consideration of it, it is necessary to design that a kind of convenient test is quick, accuracy is high and safety and stability to voltage transformer two The System and method for of secondary pressure drop on-the-spot test.
Summary of the invention
It is an object of the invention to overcome the above deficiencies in the existing technologies, and provide a kind of convenient test it is quick, The Secondary Circuit of Potential Transformer pressure drop on-site test system and method for accuracy height and safety and stability.
Technical solution used by the present invention solves the above problems is: a kind of Secondary Circuit of Potential Transformer pressure drop scene is surveyed Test system, the secondary circuit are voltage transformer on the spot between terminal box secondary voltage terminal and metering cabinet secondary voltage terminal Circuit, it is characterised in that: including voltage transformer side wireless acquisition terminal, metering cabinet side wireless acquisition terminal and main website management Server;Voltage transformer side wireless acquisition terminal measures voltage transformer terminal box secondary voltage width on the spot for acquiring Value and phase are connect with main website management server communication;Metering cabinet side wireless acquisition terminal measures metering for acquiring Cabinet secondary voltage amplitude and phase are connect with main website management server communication;It is integrated in the main website management server useful In to voltage transformer side wireless acquisition terminal and the collected voltage magnitude of metering cabinet side wireless acquisition terminal and phase progress The data record and analysis system based on Labview of data processing.
Preferably, voltage transformer side wireless acquisition terminal and voltage transformer terminal box secondary voltage terminal on the spot Between pass through RS-485 communicate.Pass through RS-485 between metering cabinet side wireless acquisition terminal and metering cabinet secondary voltage terminal Communication.RS-485 communication has good anti-interference.
Preferably, voltage transformer side wireless acquisition terminal and metering cabinet side wireless acquisition terminal install 4G SIM additional Card, the two with main website management server is communicatively coupled by 4G mobile data network.
Preferably, voltage transformer side wireless acquisition terminal and metering cabinet side wireless acquisition terminal are provided with wireless hair It send function and sample rate is higher than 2kHz.
In order to solve the above technical problems, the present invention also provides another technical solutions: a kind of Secondary Circuit of Potential Transformer pressure The test method of on-site test system, step drop are as follows:
Step 1: multiple voltage transformer sides wireless acquisition terminal is arranged and metering cabinet side wireless acquisition terminal passes through RS- The voltage magnitude and phase at 485 more Secondary Circuit of Potential Transformer both ends of communication acquisition, and sent out by 4G mobile data network Give main website management server;
Step 2: the point position that main website management server is fed back to according to wireless acquisition terminal, Auto-matching voltage is mutual Corresponding secondary circuit between sensor secondary voltage terminal and corresponding metering cabinet secondary voltage terminal, with being based on The data record and analysis system of Labview respectively or batch calculate each Secondary Circuit of Potential Transformer ratio difference, Angular difference value and secondary voltage drop error amount;
Step 3: with output after the comparison of standard prescribed limits as a result, automatically generating test result according to test result.
In above-mentioned second step, the calculation formula of secondary voltage drop error amount are as follows:
In formula: U is that voltage transformer secondary exports line voltage, and unit is volt (V);
For f-than difference, unit is percentage (%);
δ-phase value, unit are point (').
Compared with prior art, the present invention having the following advantages that and effect: passing through test voltage mutual inductor terminal box respectively And secondary circuit both end voltage phase and amplitude between secondary circuit testing terminal at metering cabinet;The test macro can be surveyed simultaneously More Secondary Circuit of Potential Transformer pressure drop datas are tried, compare each Secondary Circuit of Potential Transformer pressure fall-off test conclusion, finally Automatically generate test report;The test system and test method prepares building can be overcome to tie in difficulty of test in specific test The disadvantages of structure is complicated, laying test wire is difficult has the advantages that testing efficiency is high, test accuracy is high, can efficiently, accurately test Metering Secondary Circuit of Potential Transformer pressure drop, improves the metering Secondary Circuit of Potential Transformer pressure drop in cycling service Testing efficiency, convenient for calculating thus caused electric energy metering error, for carrying out technological improvement, reduction electrical energy measurement is comprehensive to be missed Difference reduces charging and loses important in inhibiting.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of test macro in the embodiment of the present invention.
Fig. 2 is the flow diagram of test method in the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair Bright explanation and the invention is not limited to following embodiments.
Embodiment.
Referring to Fig. 1 to Fig. 2, in the present embodiment, Secondary Circuit of Potential Transformer pressure drop on-site test system includes that voltage is mutual Sensor side wireless acquisition terminal, metering cabinet side wireless acquisition terminal and main website management server, voltage transformer side wireless collection Multiple groups are arranged in terminal and metering cabinet side wireless acquisition terminal, and secondary circuit is voltage transformer terminal box secondary voltage terminal on the spot With the circuit between metering cabinet secondary voltage terminal.
Voltage transformer side wireless acquisition terminal measures voltage transformer terminal box secondary voltage amplitude on the spot for acquiring And phase, it is connect with main website management server communication.To measure metering cabinet secondary for acquiring for metering cabinet side wireless acquisition terminal Voltage magnitude and phase are connect with main website management server communication.It is integrated in main website management server for mutual to voltage Sensor side wireless acquisition terminal and the collected voltage magnitude of metering cabinet side wireless acquisition terminal and phase carry out data processing Data record and analysis system based on Labview.
Voltage transformer side wireless acquisition terminal and voltage transformer pass through RS- between terminal box secondary voltage terminal on the spot 485 communications.It is communicated between metering cabinet side wireless acquisition terminal and metering cabinet secondary voltage terminal by RS-485.The present embodiment In, wireless acquisition terminal is responsible for being acquired the voltage of more voltage transformers in standing, and then saves, for main website management Server calls are connected by using RS-485 mode with voltage transformer secondary voltage signal, and wireless acquisition terminal can be direct Read voltage transformer secondary voltage signal.Due to, wireless acquisition terminal collection voltages mutual inductor secondary voltage signal, function Relatively easy, so carrying out data acquisition using wireless acquisition terminal greatly reduces system cost, and RS-485 is logical Letter has good anti-interference.
Voltage transformer side wireless acquisition terminal and metering cabinet side wireless acquisition terminal are provided with wireless transmission function and adopt Sample rate is higher than 2kHz.Wireless acquisition terminal, which can acquire more voltage transformers terminal box secondary terminals, metering cabinet are secondary on the spot, to be connect Three-phase voltage amplitude and phase signal at line terminals.
Voltage transformer side wireless acquisition terminal and metering cabinet side wireless acquisition terminal install 4G SIM card, the two and master additional Station administration server is communicatively coupled by 4G mobile data network.The communication fee of 4G mobile data network calculates It is carried out according to flow, and the semaphore of this test macro acquisition is relatively fewer, so average flow rate needed for transmission is smaller, Expense is lower, and mobile manufacturer can provide business platform, and building acquisition system is more convenient, can reducing the construction costs and Shorten the construction period, installation, use, the maintenance of equipment are all more convenient.The communication of 4G mobile data network can complete data The real-time online of transmitted in both directions, network is good, and data are transmitted without time delay, therefore can synchronize progress to the receiving of data, processing, So meet requirement of the system to real-time and transmission speed well, in the way of this both-way communication, can complete pair The underlying devices such as acquisition terminal remote control operation, parameter adjustment etc..The wide coverage of 4G mobile data network, coverage area Within, the control and management to acquisition terminal can be completed, to access place without limitation, dilatation is able to satisfy distribution without limitation In more backland voltage transformer secondary information of voltage collection point access demand.
Data record and analysis system based on Labview include data acquisition, secondary voltage drop error calculation, multiple terminals pair When, multiple terminals result functions, the above-mentioned function such as compare, automatically analyze and being realized one by one by virtual instrument software Labview, In Labview, to survey signal carry out data acquisition can be realized by Three models, respectively single-point acquiring, waveform acquisition and Continuous acquisition.Wherein, single-point acquiring is to sample a sample respectively from the analog input signal in each channel of acquisition equipment The shortcomings that value, after sampling terminates, Labview is real-time, reads this value without buffering, the acquisition mode is exactly collecting efficiency It is low, it not can guarantee the requirement on flexibility of data acquisition;Waveform acquisition is to carry out data to a part of waveform of analog input signal Acquisition, while one section of buffer area for being used to store these sampled datas is hewed out in a computer, when specified input signal wave After shape acquisition terminates, Labview successively comes out the reading data in buffer area;Continuous acquisition is also in a computer One section of buffer area is hewed out for sampled data, with waveform the difference is that hewing out the buffer area come by continuous acquisition mode Be it is recycled, capture program on one side by collected data be stored in buffer area while, Labview is according to setting First Data Position to be read and the length for reading data carry out section read operation to the data in buffer area.Buffer area Depth, the number of sampling rate and the sampled data read every time be all to be arranged by input control by user oneself, pass through Three above parameter value is adjusted to reach the requirement that acquisition is carried out continuously and no data overflows.
This testing system software have user can the advantages such as self-defining instrumental function and structure, and have be easy to develop, Convert the advantages that flexible, versatile, using effect is good.Secondary Circuit of Potential Transformer pressure drop based on virtual instrument technology Test macro realizes automatic collection, processing, display, preservation and the history of voltage transformer secondary voltage magnitude and phase information The analytic functions such as data, the Labview software configured after obtaining voltage transformer secondary information of voltage by main website server Realize secondary voltage drop error calculation, multiple terminals clock synchronization, multiple terminals numeric ratio to, the functions such as automatically analyze.
In the present embodiment, the step of the test method of Secondary Circuit of Potential Transformer pressure drop on-site test system are as follows:
Step 1: multiple voltage transformer sides wireless acquisition terminal is arranged and metering cabinet side wireless acquisition terminal passes through RS- The voltage magnitude and phase at 485 more Secondary Circuit of Potential Transformer both ends of communication acquisition, and sent out by 4G mobile data network Give main website management server;In particular, measuring 110kV voltage by each wireless acquisition terminal acquisition in voltage transformer side first Mutual inductor terminal box secondary voltage, i.e. secondary circuit beginning voltage on the spot;110kV is measured by metering cabinet side wireless acquisition terminal again Metering cabinet secondary voltage, obtains secondary circuit terminal voltage, and one key of main website management server collects each wireless acquisition terminal acquisition The measurement result arrived;
Step 2: the point position that main website management server is fed back to according to wireless acquisition terminal, Auto-matching voltage is mutual Corresponding secondary circuit between sensor secondary voltage terminal and corresponding metering cabinet secondary voltage terminal, with being based on The data record and analysis system of Labview respectively or batch calculate each Secondary Circuit of Potential Transformer ratio difference, Angular difference value and secondary voltage drop error amount;In particular, main website management server includes data collection computing module and General Office Module is managed, the data collection computing module of main website management server is to each Secondary Circuit of Potential Transformer first and last end voltage magnitude And phase carries out calculating analysis and the analysis of secondary voltage drop error calculation than difference, angular difference value;
Step 3: with output after the comparison of standard prescribed limits as a result, automatically generating test result according to test result;Specifically Ground is said, is sent ratio difference, angular difference value and the voltage drop error Calculation results that second step obtains in main website management server Integrated treatment module judges, and it is laggard that the Calculation results of each obtained voltage transformer are then carried out unified collection Row data comparison, then generates analysis report, consults and handles for tester scene.
In the present embodiment, error existing for electric energy metering device be total errors of electric energy countings, be by electric energy meter error, Metering caused by the resultant error of voltage transformer, the resultant error of current transformer and the pressure drop of voltage transformer secondary conducting wire misses Difference is formed, and can be indicated with such as following formula:
ε=εwPTCTr
In formula: εw- electric energy meter error, unit are percentage (%);
εPT- current transformer resultant error, unit are percentage (%);
εCT- voltage transformer resultant error, unit are percentage (%);
εrMeasurement error caused by the conducting wire pressure drop of-voltage transformer secondary, unit are percentage (%).
In power plant and substation's electrical energy measurement circuit, outdoor voltage transformer is from being installed on control room distribution board Electric energy meter has larger distance, and generally even longer in 200m~400m, there are connecting terminal block, switch, fuse in entire circuit And conducting wire, contact resistance, conductor resistance and distribution parameter are certainly existed, to there is certain impedance loop, is caused There is voltage drop on secondary circuit between voltage transformer and electric energy meter.Secondary Circuit of Potential Transformer pressure drop includes cable, terminal The summation of the voltage drops such as contact resistance, fuse, intermediate relay contact, small air switch.
Error caused by voltage transformer secondary voltage drop just refers between voltage transformer secondary terminal and face terminals General name of the difference in magnitude of voltage relative to the phase difference between the percentage of secondary virtual voltage and two voltages.It is testing In method second step, the calculation formula that secondary voltage drop error amount uses is calculated are as follows:
In formula: U is that voltage transformer secondary exports line voltage, and unit is volt (V);
For f-than difference, unit is percentage (%);
δ-phase value, unit are point (').
By arranging measurement point at secondary circuit testing terminal at voltage transformer terminal box and metering cabinet, according to voltage Voltage magnitude measured by secondary circuit two sides and phase at mutual inductor terminal box to metering cabinet calculate and analyze separate unit mutual induction of voltage Device secondary circuit can substitute into formula secondary voltage drop error amount calculation formula, acquire voltage transformer secondary pressure than difference, angular difference value Error amount drops.Simultaneously by more voltage transformer voltages in test terminal measuring station, more mutual induction of voltage can be also obtained simultaneously Device secondary voltage drop finally measures more voltage transformer secondary voltage drop test datas and analysis conclusion.
In the present embodiment, main website management server is the administrative center of entire test macro, and main website management server is by nothing Terminal box secondary wiring terminals, metering cabinet are secondary on the spot connects for the voltage transformer that line acquisition terminal is sent by wireless network Line terminals voltage signal is handled, and main website management server can also carry out the remote control to acquisition terminal, can be carried out The operations such as the parameter modification of acquisition terminal.
It is any ripe although the present invention is disclosed as above with embodiment, its protection scope being not intended to limit the invention The technical staff for knowing this technology changes and retouches made without departing from the spirit and scope of the invention, should belong to this The protection scope of invention.

Claims (7)

1. a kind of Secondary Circuit of Potential Transformer pressure drop on-site test system, the secondary circuit is voltage transformer terminal on the spot Circuit between case secondary voltage terminal and metering cabinet secondary voltage terminal, it is characterised in that: wireless including voltage transformer side Acquisition terminal, metering cabinet side wireless acquisition terminal and main website management server;Voltage transformer side wireless acquisition terminal is used Voltage transformer terminal box secondary voltage amplitude and phase on the spot are measured in acquisition, is connect with main website management server communication; Metering cabinet side wireless acquisition terminal measures metering cabinet secondary voltage amplitude and phase for acquiring, with main website management service Device communication connection;It is integrated in the main website management server for voltage transformer side wireless acquisition terminal and metering cabinet side The collected voltage magnitude of wireless acquisition terminal and the data record based on Labview of phase progress data processing are with analysis System.
2. Secondary Circuit of Potential Transformer pressure drop on-site test system according to claim 1, it is characterised in that: the electricity Pressure mutual inductor side wireless acquisition terminal is communicated between voltage transformer on the spot terminal box secondary voltage terminal by RS-485.
3. Secondary Circuit of Potential Transformer pressure drop on-site test system according to claim 1, it is characterised in that: the meter It is communicated between amount cabinet side wireless acquisition terminal and metering cabinet secondary voltage terminal by RS-485.
4. Secondary Circuit of Potential Transformer pressure drop on-site test system according to claim 1, it is characterised in that: the electricity Pressure mutual inductor side wireless acquisition terminal and metering cabinet side wireless acquisition terminal install 4G SIM card, the two and main website management service additional Device is communicatively coupled by 4G mobile data network.
5. Secondary Circuit of Potential Transformer pressure drop on-site test system according to claim 1, it is characterised in that: the electricity It presses mutual inductor side wireless acquisition terminal and metering cabinet side wireless acquisition terminal is provided with wireless transmission function and sample rate is higher than 2kHz。
6. a kind of Secondary Circuit of Potential Transformer pressure drop on-site test system as described in claim 1-5 any claim Test method, it is characterised in that: step are as follows:
Step 1: it is logical by RS-485 that multiple voltage transformer sides wireless acquisition terminal and metering cabinet side wireless acquisition terminal is arranged The voltage magnitude and phase at more Secondary Circuit of Potential Transformer both ends of letter acquisition, and master is sent to by 4G mobile data network Station administration server;
Step 2: the point position that main website management server is fed back to according to wireless acquisition terminal, Auto-matching voltage transformer Corresponding secondary circuit between secondary voltage terminal and corresponding metering cabinet secondary voltage terminal, with based on Labview's Data record and analysis system respectively or batch calculate the ratio difference of each Secondary Circuit of Potential Transformer, angular difference value and Secondary voltage drop error amount;
Step 3: with output after the comparison of standard prescribed limits as a result, automatically generating test result according to test result.
7. the test method of Secondary Circuit of Potential Transformer pressure drop on-site test system according to claim 6, feature It is: in second step, the calculation formula of secondary voltage drop error amount are as follows:
In formula: U is that voltage transformer secondary exports line voltage, and unit is volt (V);
For f-than difference, unit is percentage (%);
δ-phase value, unit are point (').
CN201910266259.3A 2019-04-03 2019-04-03 A kind of Secondary Circuit of Potential Transformer pressure drop on-site test system and method Pending CN110133562A (en)

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