CN102854486B - On-site initiative error-verification system for voltage transformer and method thereof - Google Patents

On-site initiative error-verification system for voltage transformer and method thereof Download PDF

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Publication number
CN102854486B
CN102854486B CN201210363986.XA CN201210363986A CN102854486B CN 102854486 B CN102854486 B CN 102854486B CN 201210363986 A CN201210363986 A CN 201210363986A CN 102854486 B CN102854486 B CN 102854486B
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voltage
value
parameter
controlled
wireless program
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CN201210363986.XA
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CN102854486A (en
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叶利
舒开旗
申莉
李俊
李帆
汪司珂
柯姗姗
王龙
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湖北省电力公司电力科学研究院
国家电网公司
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Abstract

The invention discloses an on-site initiative error-verification system for a voltage transformer and a method thereof and relates to a voltage transformer verification system. The system comprises a personal computer (PC) (10), a wireless program control voltage regulator (20), a voltage booster (30), a series resonance circuit (40), a standard voltage transformer (50), a detected voltage transformer (60), a wireless program control transformer calibrator (70) and a wireless program control load box (80). The method comprises equipment parameter input, verification parameter setting, booster circuit prediction, prediction result judging, automatic measurement of errors and finishing. According to the system and the method, manual control is replaced by computer control, automation of the on-site voltage transformer verification process is achieved, and on-site verification working efficiency is improved. The verification system can automatically judge an actual load of a booster circuit, works out resonance parameters, monitors each parameter in real time and performs protecting control, and improves safety of on-site verification work.

Description

Initiatively verification system and method thereof of on-the-spot voltage transformer error

Technical field

The present invention relates to a kind of voltage transformer (VT) verification system, relate in particular to a kind of initiatively verification system and method thereof of on-the-spot voltage transformer error based on wireless communication technology.

Background technology

Voltage transformer (VT) in electric system is a kind of important high-tension power transmission and transformation equipment, mainly as the voltage measurement of electric energy metrical and the signal sampling device of relay protection.Generating plant and electrical network, electrical network and electric company, electric weight trade settlement between electric company and high pressure user, all undertaken by high-voltage electric-energy meter, according to " Measurement Law of the People's Republic of China ", must carry out compulsory verification through measurement technology department to the measurement instrument that is related to trade settlement.On February 28th, 2007, State Administration for Quality Supervision and Inspection and Quarantine has issued JJG1021-2007 " electric power mutual-inductor " vertification regulation, circuit and method to voltage transformer error calibrating have been made regulation, but, due to the principle difference of all kinds of voltage transformer (VT) that use in electric system, structure is different different with installation environment, if any capacitance type potential transformer, electromagnetic potential transformer, electronic mutual inductor, GIS (Gas Insulated Switchgear, gas-insulated switchgear) voltage transformer (VT) etc., its boost model and boost capability different, boosting mode while causing carrying out ct calibrating according to code is a lot, there is stepup transformer directly to boost, series resonance is boosted and is used tested electromagnetic transformer to boost etc.

For a long time, voltage transformer (VT) on-site proving relies on and boosts manually, the mode of manual record test data, manually provide examining report, manual voltage boosting is high to operating personnel's Capability Requirement, need operating personnel to monitor multiple test parameterss simultaneously, in particular cases, also need many people to coordinate the multiple parameters of monitoring simultaneously, cause calibration operation to there is certain risk, inefficiency.

Although there is full automatic standard potential transformer calibrating installation in laboratory, realize voltage transformer (VT) automatic Verification, it is many different that laboratory environment and on-site proving environment have, and causes laboratory system to be transplanted to fielded system, and main difficulty is as follows:

(1) on-the-spot voltage transformer (VT) model is various, has electromagnetic type, condenser type, electronic type and GIS built-in, booster system be generally tested mutual inductor boost and series resonance boost.When tested mutual inductor boosts, answer tested mutual inductor model capacity inconsistent, the ceiling voltage while at every turn boosting is different with maximum current limit, and misoperation is easily damaged test product; Series resonance is boosted and is generally used for capacitance type potential transformer or GIS built-in voltage mutual inductor, be installed on the existence due to pipeline electric capacity of voltage transformer (VT) in GIS, and GIS air chamber line size specification difference, length not etc. and wiring arrangement be not quite similar, thereby cause the uncertainty of GIS pipeline electric capacity, need at the trial repeatedly adjusting inductance or the success of electric capacity parameter ability, to GIS voltage transformer (VT) site error, test brings difficulty for this.Therefore the structure of on-the-spot booster system, principle and capacity all have very big difference with laboratory.

(2) the tested mutual inductor model in laboratory is single, is the electromagnetic type standard potential transformer of different electric pressures, double-winding structure, and on-the-spot voltage transformer (VT) is generally the above structure of three windings, and institute connects Burden box quantity, capacity is different.

(3) laboratory power supply frequency stabilization, pressure regulator is generally electrician's formula pressure regulator, power supply frequency departure 50Hz ± 0.2Hz sometimes under field condition, the requirement to frequency when electrician's formula pressure regulator does not meet calibrating capacitance type potential transformer;

(4) laboratory verification equipment centralized arrangement, device is heavy, be difficult for moving, control system bus structure are wired short-range communication of rs-232 standard or parallel port, and inadaptable scene needs sometimes by booster system and the separately remote actual conditions that use of error measuring means.

Summary of the invention

The problem and shortage existing for above-mentioned prior art means, the object of this invention is to provide a kind of initiatively verification system and method thereof of on-the-spot voltage transformer error, a kind of automatic verification system and control method thereof of being applicable to the on-the-spot all kinds of voltage transformer (VT) that use based on wireless communication technology be provided, can initiatively measure, calculate the Loop Parameters that boosts, and according to different surge capacities and stepup transformer capacity, predict the amplitude of boosting, initiatively provide parameter to regulate foundation, automatically gather voltage transformer (VT) calibrating data, the overall process of monitoring calibrating in real time, there is overvoltage, overcurrent, anti-oscillating, the defencive functions such as anti-communication disruption, guarantee voltage transformer (VT) verification process safety, fast, accurately.

The object of the present invention is achieved like this:

One, initiatively verification system (abbreviation verification system) of on-the-spot voltage transformer error

This verification system comprises PC, wireless program-controlled pressure regulator, stepup transformer, series resonant tank, standard potential transformer, tested voltage transformer (VT), wireless program-controlled mutual-inductor tester and wireless program-controlled Burden box;

Its annexation is:

PC, wireless program-controlled pressure regulator, wireless program-controlled mutual-inductor tester and wireless program-controlled Burden box all form cordless communication network by wireless communications, realize communication mutually;

Wireless program-controlled output voltage regulator connects stepup transformer input end by pressure-wire;

The output terminal of stepup transformer connects the input end of series resonant tank by pressure-wire, the output terminal of series resonant tank is distinguished the primary voltage input end of connection standard voltage transformer (VT) and the primary voltage input end of tested voltage transformer (VT) by pressure-wire;

The secondary voltage output terminal of standard potential transformer connects the input end of wireless program-controlled mutual-inductor tester by pressure-wire;

The tested winding secondary voltage output terminal of tested voltage transformer (VT) connects respectively the input end of wireless program-controlled mutual-inductor tester and the input end of wireless program-controlled Burden box by pressure-wire, and other winding secondary voltage output terminals of tested voltage transformer (VT) are connected to the input end of wireless program-controlled Burden box by pressure-wire.

The principle of work of this verification system is:

The duty that this verification system requires by the detection software control wireless program-controlled mutual-inductor tester in PC and wireless program-controlled Burden box, then controls wireless program-controlled pressure regulator output power frequency small voltage to stepup transformer; After stepup transformer output HIGH voltage, the PC U that reads back from wireless program-controlled pressure regulator by wireless network s(the output electromotive force in source), U o(actual output voltage), I o(actual output current) and (output power factor), from the wireless program-controlled mutual-inductor tester A(output voltage number percent that reads back); PC calculates according to given algorithm boost loop equivalent input impedance Z and Z ' (containing the internal impedance in source) etc. according to return data; PC is according to the input current of stepup transformer, voltage limit value and stepup transformer output current, voltage limit value, and the loop parameter calculating, judge whether verification system can boost to setting value, as do not risen to setting value, provide the concrete numerical value of adjusting reactance parameter, facilitate staff to regulate accordingly test parameters, reach and test the requirement of boosting, initiatively complete voltage transformer (VT) calibrating overall process.

Two, method

Originally comprise the following steps:

1. device parameter input;

2. verification parameters setting;

3. boost loop prediction;

4. judgement predicts the outcome;

5. error is measured automatically;

6. finish.

The present invention has the following advantages and good effect:

1. computer control is replaced to manual control, verification system can form wireless network in about 100m diameter range, realizes the robotization of on-the-spot voltage transformer (VT) verification process, improves the work efficiency of on-site proving work;

2. the verification system energy automatic decision loop actual load that boosts, calculates resonant parameter, and Real-Time Monitoring each road parameter is also protected control, improves the security of on-site proving work;

3. the verification system impact of power supply frequency that is not put to the test, can accurately examine and determine the voltage transformer (VT) of all kinds of models;

4. calibrating data are realized from the automatic collection at scene, are saved in calibration certificate management, increase work efficiency.

Brief description of the drawings

Fig. 1 is the structured flowchart of this verification system;

The theory diagram of Fig. 2 wireless program-controlled pressure regulator;

The theory diagram of Fig. 3 wireless program-controlled mutual-inductor tester;

The theory diagram of Fig. 4 wireless program-controlled Burden box;

Fig. 5 is the process flow diagram of this verification system PC calibrating software;

Fig. 6 is the process flow diagram of initiatively measuring the Loop Parameters that boosts in this verification system PC calibrating software, predicting the amplitude of boosting.

Wherein:

10-PC machine;

20-wireless program-controlled pressure regulator;

21-SPWM pressure regulator, 22-voltage, electric current, power-factor measurement module,

23-the one CPU, 24-the one WiFi wireless communication module;

30-stepup transformer;

40-series resonant tank;

50-standard potential transformer;

The tested voltage transformer (VT) of 60-;

70-wireless program-controlled mutual-inductor tester;

71-program control mutual-inductor tester, the 72-the two CPU, the 73-the two WiFi wireless communication module;

80-wireless program-controlled Burden box.

81-program control Burden box A, 82-program control Burden box B,

The 83-the three CPU, the 84-the three WiFi wireless communication module.

Embodiment

One, system

1, overall

As Fig. 1, this verification system comprises PC 10, wireless program-controlled pressure regulator 20, stepup transformer 30, series resonant tank 40, standard potential transformer 50, tested voltage transformer (VT) 60, wireless program-controlled mutual-inductor tester 70 and wireless program-controlled Burden box 80;

Its annexation is:

PC 10, wireless program-controlled pressure regulator 20, wireless program-controlled mutual-inductor tester 70 and wireless program-controlled Burden box 80 all form cordless communication network by wireless communications, realize communication mutually;

Wireless program-controlled pressure regulator 20 output terminals connect stepup transformer 30 input ends by pressure-wire;

The output terminal of stepup transformer 30 connects the input end of series resonant tank 40 by pressure-wire, the output terminal of series resonant tank 40 is distinguished the primary voltage input end of connection standard voltage transformer (VT) 50 and the primary voltage input end of tested voltage transformer (VT) 60 by pressure-wire;

The secondary voltage output terminal of standard potential transformer 50 connects the input end of wireless program-controlled mutual-inductor tester 70 by pressure-wire;

The tested winding secondary voltage output terminal of tested voltage transformer (VT) 60 connects respectively the input end of wireless program-controlled mutual-inductor tester 70 and the input end of wireless program-controlled Burden box 80 by pressure-wire, and other winding secondary voltage output terminals of tested voltage transformer (VT) 60 are connected to the input end of wireless program-controlled Burden box 80 by pressure-wire.

2, functional block

1) PC 10

PC 10 is a kind of conventional personal computers, its hardware configuration is mainstream configuration, possessing WiFi[is a kind of wireless local area network technology of the IEEE802.11 of use standard, the terminals such as PC, handheld device (as PDA, mobile phone) can be connected to each other with wireless mode] wireless network card, special PC is installed and is detected software.

PC calibrating software sees below literary composition introduction.

2) wireless program-controlled pressure regulator 20

Wireless program-controlled pressure regulator 20 is based on SPWM (Sine pulse width modulation, sinusoidal pulse width modulation) voltage generator of principle, possess that output frequency is controlled, output voltage is controlled, can be by output voltage, output current and the power factor data measured by the function of WiFi wireless transmission.

As Fig. 2, wireless program-controlled pressure regulator 20 is by SPWM pressure regulator 21, and voltage, electric current, power-factor measurement module 22, the one WiFi wireless communication modules 24 and a CPU 23 form, and all has the product of standard listing.

Its annexation is:

The one CPU 23 respectively with SPWM pressure regulator 21, voltage, electric current, phase measurement module 22 and a WiFi wireless communication module 24 are connected by RS232 communication interface, realize mutually communication;

The voltage output end of SPWM pressure regulator 21 connects the input end of voltage, electric current, phase measurement module 22 by pressure-wire;

Variable name and symbol that wireless program-controlled pressure regulator 20 transmits are: source output voltage U s, output voltage U o, output current I oand output power factor

Parameter and symbol that wireless program-controlled pressure regulator 20 transmits are: maximum output voltage U outmaxwith maximum output current I outmax.

The basic technical indicator of wireless program-controlled pressure regulator 20 is as follows:

1. voltage-regulation scope: 0V~200V is adjustable;

2. output power: 5kVA or 10kVA;

3. output frequency: 45Hz~65Hz is adjustable;

4. current protection: 1A~50A can establish;

5. output voltage limit value: 10V~200V can establish;

6. measurement function: electric current, voltage, power factor;

7. communication function: WiFi radio communication.

3) stepup transformer 30

Stepup transformer 30 is a kind of mutual inductors that interchange small voltage are upgraded to ac high voltage.Can be special stepup transformer, also can use electromagnetic potential transformer to work as stepup transformer and use.Stepup transformer 30 has standard listing product.

Parameter and the symbol of stepup transformer 30 are: maximum input voltage U inmaxwith maximum input current I inmax.

4) series resonant tank 40

Series resonant tank 40 comprises high pressure REgulatable reactor and high-voltage capacitor composition, all has standard listing product.

High pressure REgulatable reactor is formed by more piece REgulatable reactor closed assembly, every joint reactor rated voltage 40kV.

High-voltage capacitor is 0.02 μ F/110kV, can use by multi-section serial.

5) standard potential transformer 50

Standard potential transformer 50 has standard listing product.Identical with tested voltage transformer (VT) 60 no-load voltage ratios, rated voltage is identical, and class of accuracy is generally higher than two grades of tested voltage transformer (VT) 60.

6) tested voltage transformer (VT) 60

Be the calibrating object of this verification system, have standard listing product.

7) wireless program-controlled mutual-inductor tester 70

Wireless program-controlled mutual-inductor tester 70 be that to adopt differential technique principle and frequency of operation be 50Hz for measuring the mutual-inductor tester of mutual inductor proportional error, possess WiFi radio communication control function.

As Fig. 3, wireless program-controlled mutual-inductor tester 70 is made up of program control mutual-inductor tester 71, the two WiFi wireless communication modules 73 and the 2nd CPU 72, all has the product of standard listing.

Its annexation is:

The 2nd CPU72 is connected by RS232 communication interface with program control mutual-inductor tester 71 and the 2nd WiFi wireless communication module 73 respectively, realizes communication mutually;

Variable name and symbol that wireless program-controlled mutual-inductor tester 70 transmits are: number percent A, ratio difference f and phase differential δ.

Parameter and symbol that wireless program-controlled mutual-inductor tester 70 transmits are: secondary voltage range D, calibrating point 1J1, calibrating point 2J2 and calibrating point 3J3.

The basic technical indicator of wireless program-controlled mutual-inductor tester 70 is as follows:

1. voltage range: 100V,

2. communication function: WiFi radio communication.

8) wireless program-controlled Burden box 80

Wireless program-controlled Burden box 80 is in the time of calibrating voltage transformer (VT), load is provided to tested voltage transformer (VT) 60, and load is made up of passive impedance device, possesses WiFi radio communication control function.

As Fig. 4, wireless program-controlled Burden box 80 is made up of program control Burden box A81, program control Burden box B82, the 3rd WiFi wireless communication module 84 and the 3rd CPU 83, all has the product of standard listing.

Its annexation is:

The 3rd CPU 83 is connected by RS232 communication interface with program control Burden box A81, program control Burden box B81 and the 3rd WiFi wireless communication module 84 respectively, realizes communication mutually.

Parameter and symbol that wireless program-controlled Burden box 80 is transmitted are: load value B and load power factor C.

The basic technical indicator of wireless program-controlled Burden box 80 is as follows:

1. rated voltage: 100V,

2. the passage of loading: 2 tunnels;

3. rated frequency: 50Hz;

4. power factor: 0.8,1.0;

5. load range: 1.25VA~150VA;

6. communication function: WiFi radio communication.

Two, method

As Fig. 5, this method is the active calibration method of being examined and determine software application based on above-mentioned verification system by PC 10, comprises the following steps:

Start 0

1. device parameter input 1

Determine the device performance parameters of wireless program-controlled pressure regulator 20 and stepup transformer 30;

The wireless program-controlled pressure regulator parameter of inputting: maximum output voltage U outmaxwith maximum output current I outmax;

The stepup transformer parameter of inputting: maximum input voltage U inmaxwith maximum input current I inmax;

2. verification parameters arranges 2

The parameter of wireless program-controlled mutual-inductor tester 70 and wireless program-controlled Burden box 80 is set according to the type of tested voltage transformer (VT) 60;

The wireless program-controlled transducer check instrument parameter of inputting: secondary voltage range D, calibrating point 1J1, calibrating point 2J2 and calibrating point 3J3;

The wireless program-controlled Burden box parameter of inputting: load value B and load power factor C;

2. the loop prediction 3 of boosting

Calculate equivalent input impedance Z ', boost loop equivalent resistance R, boost loop equivalent reactance X, the program control pressure regulator maximum output current I of loop containing source internal impedance that boost omaxwith the prediction maximal value A that boosts maxdeng, so that PC judges system and whether can boost to a maximum calibrating point J3 for setting, as do not risen to setting value, provide the prompting of adjusting the concrete numerical value of reactance parameter;

4. predict the outcome and judge 4

According to step results of measuring 3., judge whether to rise to setting value, be that 5. program enters step, otherwise 6. program enter step, EOP (end of program);

5. error measures 5 automatically

2. calibrating data are examined and determine and preserved to the calibrating point and the Burden box parameter that pre-set according to step to the error of tested voltage transformer (VT) 60;

6. finish 6.

3. the boost method of loop prediction of described step, as Fig. 6, comprises the following steps:

Start 0;

A, loop parameter measure 1

Control wireless program-controlled pressure regulator 20 and export certain voltage value U s1, wireless program-controlled pressure regulator 20 is measured U o1, I o1, the value of 3 variablees, wireless program-controlled mutual-inductor tester 70 is measured A 1value, PC calibrating software above-mentioned 5 numerical value that read back;

B, voltage ratio are compared with 2

Judge voltage parameter U outmaxwhether be greater than U inmax, be to carry out the first loop parameter to calculate 3, otherwise carry out second servo loop calculation of parameter 4;

Described the first loop parameter calculates 3, is to measure according to loop parameter the numerical value reading back in 1 to be calculated as follows:

A max=A 1×U inmax/U o1

Z=U o1/I o1

I omax=U inmax/Z

Described second servo loop calculation of parameter 4 is to measure according to loop parameter the numerical value reading back in 1 to be calculated as follows:

A max=A 1×U outmax/U s1

Z’=U s1/I o1

Z=U o1/I o1

I omax=U outmax/Z’

C, the first predicted value judge 5

The A that judgement relatively calculates maxwhether be less than and set maximum calibrating point J3, be to carry out first to predict the outcome 12, otherwise carry out the first current ratio compared with 6;

D, the first current ratio are compared with 6

Judge calculated value I omaxwhether be greater than parameter value I outmax, be to carry out the second current ratio compared with 7, otherwise carry out the 3rd current ratio compared with 8;

E, the second current ratio are compared with 7

Judge parameter value I outmaxwhether be greater than parameter value I inmax, be to carry out the second predictor calculation 10, otherwise carry out the first predictor calculation 9;

Described the first predictor calculation 9 is to recalculate and predict the maximal value of boosting by following formula:

A max=A 1×I outmax/I o1

F, the 3rd current ratio are compared with 8

Judge calculated value I omaxwhether be greater than parameter value I inmax, be to carry out the second predictor calculation 10, predict the outcome 13 otherwise carry out second;

Described the second predictor calculation 10 is to recalculate and predict the maximal value of boosting by following formula:

A max=A 1×I inmax/I o1

G, the second predicted value judge 11

The A that judgement recalculates maxwhether, be carry out first predict the outcome 12, predict the outcome 13 otherwise carry out second if being less than and setting maximum calibrating point J3;

Described first predicts the outcome 12, is to provide not by the conclusion of prediction: maximum voltage can only be raised to numerical value A max, the maximum that can not be raised to setting is examined and determine the numerical value of some J3; When the X calculating be on the occasion of time, prompting increases series resonant tank inductance value | X|, in the time that the X calculating is negative value, points out and reduce series resonant tank inductance value | X|;

Described second predicts the outcome 13, is the conclusion providing by prediction: maximum voltage can be raised to the numerical value of the maximum calibrating point J3 of setting;

H, end 14.

Claims (2)

1. an initiatively calibration method of on-the-spot voltage transformer error, its verification system comprises PC (10), wireless program-controlled pressure regulator (20), stepup transformer (30), series resonant tank (40), standard potential transformer (50), tested voltage transformer (VT) (60), wireless program-controlled mutual-inductor tester (70) and wireless program-controlled Burden box (80);
PC (10), wireless program-controlled pressure regulator (20), wireless program-controlled mutual-inductor tester (70) and wireless program-controlled Burden box (80) all form cordless communication network by wireless communications, realize communication mutually;
The output terminal of wireless program-controlled pressure regulator (20) connects the input end of stepup transformer (30) by pressure-wire;
The output terminal of stepup transformer (30) connects the input end of series resonant tank (40) by pressure-wire, the output terminal of series resonant tank (40) is distinguished the primary voltage input end of connection standard voltage transformer (VT) (50) and the primary voltage input end of tested voltage transformer (VT) (60) by pressure-wire;
The secondary voltage output terminal of standard potential transformer (50) connects the input end of wireless program-controlled mutual-inductor tester (70) by pressure-wire;
The tested winding secondary voltage output terminal of tested voltage transformer (VT) (60) connects respectively the input end of wireless program-controlled mutual-inductor tester (70) and the input end of wireless program-controlled Burden box (80) by pressure-wire, and other winding secondary voltage output terminals of tested voltage transformer (VT) (60) are connected to the input end of wireless program-controlled Burden box (80) by pressure-wire;
It is characterized in that comprising the following steps:
Start (0)
1. device parameter input (1)
Determine the device performance parameters of wireless program-controlled pressure regulator (20) and stepup transformer (30);
The wireless program-controlled pressure regulator parameter of inputting: maximum output voltage U outmaxwith maximum output current I outmax;
The stepup transformer parameter of inputting: maximum input voltage U inmaxwith maximum input current I inmax;
2. verification parameters setting (2)
The parameter of wireless program-controlled mutual-inductor tester (70) and wireless program-controlled Burden box (80) is set according to the type of tested voltage transformer (VT) (60);
The wireless program-controlled transducer check instrument parameter of inputting: secondary voltage range D, calibrating point 1J1, calibrating point 2J2 and calibrating point 3J3;
The wireless program-controlled Burden box parameter of inputting: load value B and load power factor C;
3. the loop prediction (3) of boosting
Calculate equivalent input impedance Z ', boost loop equivalent resistance R, boost loop equivalent reactance X, the program control pressure regulator maximum output current I of loop containing source internal impedance that boost omaxwith the prediction maximal value A that boosts max, so that judging system, PC whether can boost to the maximum calibrating point J3 of setting, as do not risen to setting value, provide the prompting of adjusting the concrete numerical value of reactance parameter;
4. judgement (4) predicts the outcome
According to step results of measuring 3., judge whether to rise to setting value, be that 5. program enters step, otherwise 6. program enter step, EOP (end of program);
5. error is measured (5) automatically
2. calibrating data are examined and determine and preserved to the calibrating point and the Burden box parameter that pre-set according to step to the error of tested voltage transformer (VT) (60);
6. finish (6).
2. by calibration method claimed in claim 1, it is characterized in that:
3. the boost method of loop prediction of described step comprises the following steps:
Start (0);
A, loop parameter are measured (1)
Control wireless program-controlled pressure regulator (20) output certain voltage value U s1, wireless program-controlled pressure regulator (20) is measured U o1, I o1, the value of 3 variablees, wireless program-controlled mutual-inductor tester (70) is measured A 1value, PC calibrating software above-mentioned 5 numerical value that read back;
U s: the output electromotive force in source, U s1the U under system stability state san actual value;
U o: actual output voltage, U o1the U under system stability state oan actual value;
I o: actual output current, I o1the I under system stability state oan actual value;
output power factor, under system stability state an actual value;
A: output voltage number percent, A 1it is an actual value of the A under system stability state;
(2) of B, voltage ratio
Judge voltage parameter U outmaxwhether be greater than U inmax, be to carry out the first loop parameter to calculate (3), otherwise carry out second servo loop calculation of parameter (4);
Described the first loop parameter calculates (3), is to measure according to loop parameter the numerical value reading back in (1) to be calculated as follows:
A max=A 1×U inmax/U o1
Z=U o1/I o1
I omax=U inmax/Z
Described second servo loop calculation of parameter (4) is to measure according to loop parameter the numerical value reading back in (1) to be calculated as follows:
A max=A 1×U outmax/U s1
Z’=U s1/I o1
Z=U o1/I o1
I omax=U outmax/Z’
C, the first predicted value judgement (5)
The A that judgement relatively calculates maxwhether, be carry out first predict the outcome (12), otherwise carry out (6) of the first current ratio if being less than and setting maximum calibrating point J3;
(6) of D, the first current ratio
Judge calculated value I omaxwhether be greater than parameter value I outmax, be to carry out (7) of the second current ratio, otherwise carry out (8) of the 3rd current ratio;
(7) of E, the second current ratio
Judge parameter value I outmaxwhether be greater than parameter value I inmax, be to carry out the second predictor calculation (10), otherwise carry out the first predictor calculation (9);
Described the first predictor calculation (9) is to recalculate and predict the maximal value of boosting by following formula:
A max=A 1×I outmax/I o1
(8) of F, the 3rd current ratio
Judge calculated value I omaxwhether be greater than parameter value I inmax, be to carry out the second predictor calculation (10), otherwise execution second predicts the outcome (13);
Described the second predictor calculation (10) is to recalculate and predict the maximal value of boosting by following formula:
A max=A 1×I inmax/I o1
G, the second predicted value judgement (11)
The A that judgement recalculates maxwhether be less than and set maximum calibrating point J3, be to carry out first to predict the outcome (12), otherwise execution second predicts the outcome (13);
Described first predicts the outcome (12), is to provide not by the conclusion of prediction: maximum voltage can only be raised to numerical value A max, the maximum that can not be raised to setting is examined and determine the numerical value of some J3; When the X calculating be on the occasion of time, prompting increases series resonant tank inductance value | X|, in the time that the X calculating is negative value, points out and reduce series resonant tank inductance value | X|;
Described second predicts the outcome (13), is the conclusion providing by prediction: maximum voltage can be raised to the numerical value of the maximum calibrating point J3 of setting;
H, end (14).
CN201210363986.XA 2012-09-26 2012-09-26 On-site initiative error-verification system for voltage transformer and method thereof CN102854486B (en)

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CN103336260B (en) * 2013-05-29 2014-12-24 国家电网公司 System for checking voltage transformer in GIS (gas insulated switchgear)
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