RU2676561C1 - Method of monitoring and evaluation of accuracy of rotating transformers and analog-digital converters of their signals to code - Google Patents

Method of monitoring and evaluation of accuracy of rotating transformers and analog-digital converters of their signals to code Download PDF

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RU2676561C1
RU2676561C1 RU2018107344A RU2018107344A RU2676561C1 RU 2676561 C1 RU2676561 C1 RU 2676561C1 RU 2018107344 A RU2018107344 A RU 2018107344A RU 2018107344 A RU2018107344 A RU 2018107344A RU 2676561 C1 RU2676561 C1 RU 2676561C1
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Prior art keywords
error
rotating
code
transformer
controlled
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RU2018107344A
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Russian (ru)
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Александр Валерьевич Алексеев
Валерий Васильевич Алексеев
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Александр Валерьевич Алексеев
Валерий Васильевич Алексеев
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00Error detection; Error correction; Monitoring
    • GPHYSICS
    • G08SIGNALLING
    • G08CTRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00Electric signal transmission systems
    • G08C19/38Electric signal transmission systems using dynamo-electric devices
    • G08C19/46Electric signal transmission systems using dynamo-electric devices of which both rotor and stator carry windings
    • G08C19/48Electric signal transmission systems using dynamo-electric devices of which both rotor and stator carry windings being the type with a three-phase stator and a rotor fed by constant-frequency ac, e.g. selsyn, magslip
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00Analogue/digital conversion; Digital/analogue conversion
    • H03M1/10Calibration or testing

Abstract

FIELD: measuring equipment.SUBSTANCE: invention relates to the evaluation of the accuracy of rotating transformers (RT) and analog-to-digital converters of their signals into the code (ADCRT). Method is proposed in which, unlike the existing one, measurement of the error of following RT in remote transmission is carried out with the help of three RTs of the same type, and three pairs are formed: the first RT with the second one, the second with the third, the first with the third. Measurements are carried out in angular coordinates, which are determined according to the method specified in the standard for digital angle converters of the form of general specifications. Three arrays of errors are obtained. Same RTs are measured in the same angular coordinates and with the ADCRT of the highest capacity. Three arrays of errors are obtained as well.EFFECT: technical result is to improve the accuracy of the method by means of determining the actual error, which is controlled by RT (and ADCRT) due to the exclusion, when processing the measurement results, of the error of the second and third RT, which are included in the measurements both in remote transmission and when the ADCRT is connected to them.1 cl, 1 tbl

Description

The invention relates to the field of measuring equipment and electrical machines.

A known method of controlling the error following a randomly selected pair of rotating transformers (VT) in remote transmission or with a reference device. In this case, the VT-sensor and the VT-receiver are installed in goniometric devices that allow their rotors to be turned at any angles with an error of no more than:

- ± 2 ang. s - during control with a follow-up error of ± 6 and ± 12 ang. from;

- ± 5 ang. c - during control with a follow-up error of ± 18 and ± 30 ang. from; and included in the remote transmission scheme.

After applying voltage to the VT-sensor installed in the zero position, the rotor of the VT-receiver is installed in a coordinated position corresponding to the smallest indication of a narrow-band voltmeter connected to the output winding of the VT-receiver. The rotor of the VT sensor is rotated within an angle of 0-360 angles. hail in steps of 10 corners. hail. The rotor of the BT receiver is rotated each time to the matching position, which is determined at the time of the smallest reading of the narrow-band voltmeter. The value of the error in the considered angular coordinate is determined as the difference of the angle readings on the goniometric devices.

For the following error in remote transmission of arbitrarily selected VT pairs or with a reference device, take the half-sum of the absolute values of the largest negative and greatest positive deviations of the rotor of the VT receiver in the matching position from the angle of rotation of the rotor of the VT sensor.

The disadvantage of this method is the low accuracy when monitoring the most accurate of the existing bipolar VT. For example, VT types VT-7 and VT-5 have a following error at best for the highest accuracy class ± 60 angles. With targeted selection, it is possible to select VTs of a higher accuracy class (± 30 arcsec). But in this case, the task is not fully solved. Therefore, it is not possible to select at least an exemplary (non-reference) VT with a ratio of accuracy of 1: 3 (exemplary / controlled).

The same situation occurs when controlling analog-to-digital converters of VT signals (ATSPVT) into a digital code. For example, when forming a single-count 16-bit angle-parameter-code converter, when a 16-bit ADCWT is connected to a VT (when they are separately supplied). In particular, a specific case when an ATsPVT-16M-0 (according to PIZhM. 468157.029 TU) is connected to a VT-5 type VT (according to KFO.303.006 TU). The error of the angular coordinates of the change in the code values of the specified ADCWT according to the technical conditions for it is ± 40 angles. s, that is, the errors of VT and ADCVT are close. Therefore, when monitoring single-digit 16-bit ADCVTs, we face the same problem.

The aim of the invention is to improve the accuracy of the control method of VT and ADCVT. This goal is achieved by the fact that

1 to a method for monitoring and evaluating the accuracy of VTs and ADCVTs of their signals in a code consisting in the fact that the monitored (first) VTs are included in the remote transmission circuit in which the reference (second) VTs sensor and the controlled VTs are installed in goniometric devices, apply voltage to the sensor is set to zero, the rotor of the controlled VT is installed in a coordinated position corresponding to the smallest indication of a narrow-band voltmeter connected to the output winding of the controlled VT, the rotor of the sensor is turned to the limit x angle 0-360 ang. hail in steps of 10 corners. the hail, rotor of the controlled VT rotate each time to the matching position, record the reading of the goniometer device with which the controlled VT is kinematically connected, subtract from this reading the value of the angle on the goniometer device with which the sensor is kinematically connected, obtain the error value of the controlled VT in this angular coordinate, characterized in that the third VT is used for monitoring, include all three VTs in pairs in the remote transmission of the first with the second, the second with the third, the first with the third, measure ogreshnost repetition of each pair of selected angular coordinates that are not arranged with equal steps to the angle in the range of 0-360 carbon. hail, is used to control the ADCWT, close to the accuracy of the VT, connect it alternately to each VT installed in the goniometer device, measure the error of the coordinates of the change of code values in the same angular coordinates as when measuring the following error in remote transmission, determine the error of the controlled BT in each angular coordinate according to the formula

Figure 00000001

where Δ 1i is the error of the controlled (first) VT; E 21i and E 23i are the errors in the coordinates of the change in the code values obtained when measuring the angle-parameter-code converter, formed alternately from the first and third VT and ADCVT, respectively;

Figure 00000002
- the error following the remote transmission, composed of the first and third VT; i = 1, 2, ..., n is the index denoting the number of the measured angular coordinate; determine the errors of the second and third VT, respectively, by the formulas

Figure 00000003

Figure 00000004

where E 22i is the error of the coordinates of the change in the code values obtained when measuring the second VT with the ADCVT connected to it;

Figure 00000005
and
Figure 00000006
- the following errors in remote transmission, composed respectively of the first with the second VT and the second with the third.

2 The method according to p. 1 accuracy control ADCVT, characterized in that its error is calculated by the formulas

Figure 00000007
Figure 00000008

Figure 00000009

where E 21i (A) , E 22i (A) and E 23i (A) is the error of the coordinates of the change in the values of the ADCVT code obtained with the first, second and third VT. (A) - not a degree, but a superscript, which means that the error refers to the ADCVT.

Formulas for processing measurement results are obtained as follows. Error equations were compiled. Three equations for VT.

Figure 00000010
Figure 00000011
Figure 00000012

Hereinafter, in order to simplify, the index “i” in the formulas is omitted. Three equations for angle-parameter-code converters were also compiled.

Figure 00000013
Figure 00000014
Figure 00000015

Where

Figure 00000016
- the error following in the remote transmission, composed of the first and second VT,
Figure 00000017
- the same, composed of the second and third BT,
Figure 00000018
- the same, composed of the first and third BT; Δ 1 , Δ 2 , Δ 3 - the error that actually has the first, second and third VT, respectively; E 21 , E 22 , E 23 - the error of the coordinates of the change in the code values of the angle-parameter-code converter generated when the first, second, and third VTs are connected to the ADCT,
Figure 00000019
- the error of the coordinates of the change in the values of the ADCVT code.

Continuation of the transformation. Subtracting equation (6) from equation (4), we obtain the equation E 21 -E 23 = Δ 13 (7). From equation (3) is determined

Figure 00000020
its value is substituted in equation (7). Then
Figure 00000021
From here

Figure 00000022

The following equations are similarly obtained

Figure 00000023
Figure 00000024

Having carried out similar calculations in relation to the error of the ADCWT (E 2 (A) ), an equation was obtained to determine its value

Figure 00000025
etc.

The performance and effectiveness of the proposed method is confirmed as follows. Six measurement cycles were performed. Three cycles included measuring the following error in the remote transmission of VT VT-5 type. In each cycle, measurements were carried out in 129 angular coordinates, including zero. In this case, the measurement steps were unequal. The selection of measured angular coordinates was carried out in accordance with the recommendations of the standard GOST RV 53015-2003. “Angle converters digital. General specifications. " This is due to the fact that the same VTs were part of the angle-parameter-code converters, the E 2 error of which was measured in accordance with the requirements of the specified standard. In this case, a single-count 16-bit converter of the type АЦПВТ-16П-01К was used as an electronic converter of BT signals to code.

The measurement results are shown in the table. All measured and calculated values are given in angular seconds. Only 1/6 of the results of the measurements are placed in the table. First of all, those angular coordinates were selected in which extreme and close to them values for each type of error took place. Extreme values are highlighted.

Figure 00000026

The last and penultimate row of the table shows the range values for each error considered. From these lines it can be seen that the error range of the VT obtained by the proposed method (Δ 1i ) is significantly (2.25 times) less than when measured in remote transmission

Figure 00000027
namely: ± 36.5 / ± 16.25 = 2.25. (The error values were used according to the standard).

The error E 2 of the ADCVT obtained by the proposed method (E 21i (A) ) is also less (1.23 times) the error that was obtained as the difference in the existing method

Figure 00000028
i.e. ± 44 / ± 35.75 = 1.23.

The source of information taken into account during the examination: GOST RV 51816. 10 - 2001. “Rotating transformers. Group specifications. ”

Claims (9)

1. A method for monitoring and evaluating the accuracy of rotating transformers and analog-to-digital converters of their signals into a code, which consists in the fact that the controlled (first) rotating transformer is included in a remote transmission circuit in which the reference (second) rotating transformer is a sensor and a controlled rotating transformer set in goniometric devices, apply voltage to the sensor installed in the zero position, the rotor of the controlled rotating transformer is set in a coordinated position, with Resp smallest indication narrowband voltmeter connected to the output winding of the rotary transformer is controllable, the sensor rotor is rotated within an angle of 0-360 carbon. hail in steps of 10 corners. the hail, rotor of the controlled rotating transformer is rotated each time to the matching position, the reading of the goniometer device to which the controlled rotating transformer is kinematically connected is subtracted, the angle value on the goniometer device to which the sensor is kinematically connected is subtracted from this reading, the error value of the controlled rotating transformer in this angular coordinate, characterized in that a third rotary transformer is used for control, include all three rotating transformers in pairs in the remote transmission of the first with the second, second with the third, the first with the third, measure the error of each pair in the selected angular coordinates, which are not with equal steps in angle in the range of 0-360 angles. hail, an analog-to-digital converter of signals of a rotating transformer to a code close to rotating transformers in accuracy is used for monitoring, it is connected in turn to each rotating transformer installed in a goniometer device, the error of coordinates of the change of code values is measured in the same angular coordinates as when measuring the following errors in remote transmission, determine the error of the controlled rotating transformer in each angular coordinate according to the formula
Δ 1i = (E 21i -E 23i + ΔΘ 13i ) / 2,
determine the errors of the second and third rotating transformers, respectively, by the formulas
Δ 2i = (E 22i -E 21i + ΔΘ 12i ) / 2; Δ 3i = (E 23i -E 22i + ΔΘ 23i ) / 2;
where Δ 1i is the error of the controlled (first) rotating transformer; E 21i and E 23i are the errors in the coordinates of the change in code values obtained when measuring the angle-parameter-code converter, formed respectively from the first and third alternately rotating transformers and the analog-to-digital converter of their signals into code; ΔΘ 13i is the error following the remote transmission, composed of the first and third rotating transformers; i = 1, 2, ..., n is the index denoting the number of the measured angular coordinate; E 22i is the error of the coordinates of the change in the code values obtained when measuring the second rotating transformer with the connected analog-to-digital converter of its signals into code; ΔΘ 12i and ΔΘ 23i are the following errors in remote transmission, composed respectively of the first with the second rotating transformer and the second with the third.
2. The method according to p. 1, controlling the accuracy of an analog-to-digital converter of signals of a rotating transformer into a code, characterized in that its error is calculated by the formulas
E 21i (A) = (E 21i + E 23i -ΔΘ 13i ) / 2; E 22i (A) = (E 22i + E 21i -ΔΘ 12i ) / 2;
E 23i (A) = (E 23i + E 22i -ΔΘ 23i ) / 2,
where E 21i (A) , E 22i (A) and E 23i (A) are the coordinate errors of the change in the code values of the analog-to-digital converter of the signals of the rotating transformer into the code, obtained respectively when measuring with the first, second and third rotating transformers; (A) is the superscript.
RU2018107344A 2018-02-28 2018-02-28 Method of monitoring and evaluation of accuracy of rotating transformers and analog-digital converters of their signals to code RU2676561C1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU474836A1 (en) * 1974-01-24 1975-06-25 Войсковая часть 67947 Device for measuring the accuracy of rotating transformers
SU538387A1 (en) * 1975-01-07 1976-12-05 Предприятие П/Я М-5068 Device for remote angle transmission
RU2046514C1 (en) * 1992-09-11 1995-10-20 Лев Григорьевич Русаков Method for determining rotary transformer error
CN102818952A (en) * 2012-07-31 2012-12-12 西北工业大学 Method and device for automatically detecting and compensating zero position deviation of rotary transformer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU474836A1 (en) * 1974-01-24 1975-06-25 Войсковая часть 67947 Device for measuring the accuracy of rotating transformers
SU538387A1 (en) * 1975-01-07 1976-12-05 Предприятие П/Я М-5068 Device for remote angle transmission
RU2046514C1 (en) * 1992-09-11 1995-10-20 Лев Григорьевич Русаков Method for determining rotary transformer error
CN102818952A (en) * 2012-07-31 2012-12-12 西北工业大学 Method and device for automatically detecting and compensating zero position deviation of rotary transformer

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