MD603Z - Method for manufacture of resistive voltage divider - Google Patents

Method for manufacture of resistive voltage divider Download PDF

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Publication number
MD603Z
MD603Z MDS20110173A MDS20110173A MD603Z MD 603 Z MD603 Z MD 603Z MD S20110173 A MDS20110173 A MD S20110173A MD S20110173 A MDS20110173 A MD S20110173A MD 603 Z MD603 Z MD 603Z
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Moldova
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housing
conductor
resistance
frame
voltage divider
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MDS20110173A
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Romanian (ro)
Russian (ru)
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Николае ДИМИТРАКИ
Серджиу ДИМИТРАКИ
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Технический университет Молдовы
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Publication of MD603Z publication Critical patent/MD603Z/en

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Abstract

The invention relates to the power engineering, in particular to the technique for measurement of high alternating and direct voltages, namely to methods for manufacture of resistive voltage dividers wound from wire, for example, microwire.The method for manufacture of resistive voltage divider consists in the continuous winding of insulated wire, for example, of microwire in glass insulation, on the first and second frames, connected to each other, mounting at a distance from the first and second frames of the third rotating frame, perpendicular to them, of the same size and structure as the second frame, rewinding of the wire from the second frame on the third frame. At the same time, the wire on the third frame with the wire on the first frame and the secondary windings of a differential transformer form a bridge with four arms. Upon reaching the equilibrium of the bridge the rewinding of the wire is stopped and the wire is cut. The second frame is dismantled from the first frame and the first frame is connected to the third frame, forming a voltage divider.

Description

Invenţia se referă la energetică, în special, la tehnica de măsurare a tensiunilor înalte de curent continuu şi curent alternativ, şi anume la procedeele de confecţionare a divizoarelor de tensiune rezistive bobinate din conductor, de exemplu, microfir. The invention relates to energy, in particular, to the technique of measuring high direct current and alternating current voltages, namely to the processes of making resistive voltage dividers wound from a conductor, for example, microwire.

Este cunoscută tehnologia de confecţionare a divizoarelor de tensiune, formate dintr-un lot de rezistoare, rezistenţele acestora fiind selectate astfel încât să se asigure coeficientul de divizare egal cu 10n, unde n este un număr întreg pozitiv sau 0 [1]. The technology for making voltage dividers is known, consisting of a batch of resistors, their resistances being selected so as to ensure the division coefficient equal to 10n, where n is a positive integer or 0 [1].

Dezavantajul acestei tehnologii constă în faptul că rezistoarele ce formează divizorul de tensiune sunt bobinate din diferite loturi de conductoare şi pot avea diferiţi coeficienţi de rezistenţă termică. Aceasta influenţează negativ asupra stabilităţii termice şi, respectiv, asupra coeficientului de divizare al divizorului de tensiune, reducând clasa de precizie a acestuia. Un alt dezavantaj constă în faptul că pentru asigurarea coeficientului de divizare cu valoarea şi precizia prestabilite ajustarea rezistenţei fiecărei secţii se efectuează separat, ceea ce complică tehnologia de confecţionare a divizoarelor de tensiune din această clasă şi, ca urmare, măreşte costul acestora. The disadvantage of this technology is that the resistors forming the voltage divider are wound from different batches of conductors and may have different thermal resistance coefficients. This negatively influences the thermal stability and, respectively, the division coefficient of the voltage divider, reducing its accuracy class. Another disadvantage is that in order to ensure the division coefficient with the predetermined value and accuracy, the resistance adjustment of each section is carried out separately, which complicates the manufacturing technology of voltage dividers of this class and, as a result, increases their cost.

Cea mai apropiată soluţie este procedeul de confecţionare a divizoarelor de tensiune bobinate din microfir în izolaţie de sticlă, în care secţiile, care formează divizorul de tensiune, sunt bobinate pe carcasă din acelaşi microfir, ceea ce face ca coeficientul de divizare al divizorului de tensiune să rămână constant la variaţia temperaturii, ce prezintă un avantaj [2]. The closest solution is the process of making voltage dividers wound from microwire in glass insulation, in which the sections that form the voltage divider are wound on a casing made of the same microwire, which makes the voltage divider's division coefficient remain constant with temperature variation, which presents an advantage [2].

Dezavantajul acestui procedeu constă în asigurarea coeficientului de divizare prestabilit prin ajustarea rezistenţei fiecărei secţii aparte prin debobinarea consecutivă a porţiunilor mici de microfir şi măsurarea rezistenţei microfirului rămas pe carcasă după fiecare debobinare. Această operaţie poate fi repetată de mai multe ori, ce influenţează negativ asupra costului divizorului de tensiune. În anumite cazuri, rezistenţa ultimei porţiuni scoase de pe divizorul de tensiune poate depăşi rezistenţa necesară pentru obţinerea valorii nominale a rezistenţei secţiei. În aceste cazuri secţia ajustată posedă o rezistenţă mai mică decât cea necesară şi, respectiv, secţia se rebutează. The disadvantage of this procedure is that the predetermined division coefficient is ensured by adjusting the resistance of each separate section by consecutively unwinding small portions of microwire and measuring the resistance of the microwire remaining on the casing after each unwinding. This operation can be repeated several times, which negatively influences the cost of the voltage divider. In some cases, the resistance of the last portion removed from the voltage divider may exceed the resistance required to obtain the nominal value of the section resistance. In these cases, the adjusted section has a resistance lower than the required one and, respectively, the section is discarded.

Problemele pe care le rezolvă invenţia constau în majorarea stabilităţii termice a coeficientului de divizare a divizorului de tensiune, excluderea operaţiei de ajustare manuală a secţiilor şi, ca urmare, micşorarea volumului de muncă la ajustarea divizoarelor de tensiune de acest gen şi, respectiv, micşorarea costului acestora şi excluderea rebutului posibil. The problems solved by the invention consist in increasing the thermal stability of the voltage divider division coefficient, excluding the manual adjustment of the sections and, as a result, reducing the workload when adjusting voltage dividers of this type and, respectively, reducing their cost and excluding possible scrap.

Procedeul, conform invenţiei, înlătură dezavantajele menţionate mai sus prin aceea că constă în: The process, according to the invention, eliminates the disadvantages mentioned above by consisting of:

- bobinarea continuă a conductorului în izolaţie, de exemplu, a microfirului în izolaţie de sticlă, cu rezistenţa sumară R=R1+R2=R1+R1/K pe prima şi a doua carcase, cu lungimile eficace L1 şi L2, respectiv, unite între ele, pe capetele cărora sunt fixate inele conductoare, totodată bobinarea se efectuează prin distribuirea omogenă a conductorului cu rezistenţa R1 pe lungimea eficace L1 a primei carcase şi cu rezistenţa R2 = R1/K pe lungimea eficace L2 a carcasei a doua, unde K este coeficientul de divizare a divizorului de tensiune; - continuous winding of the conductor in insulation, for example, of the microwire in glass insulation, with the total resistance R=R1+R2=R1+R1/K on the first and second housings, with the effective lengths L1 and L2, respectively, joined together, on the ends of which conductive rings are fixed, at the same time the winding is performed by homogeneously distributing the conductor with the resistance R1 on the effective length L1 of the first housing and with the resistance R2 = R1/K on the effective length L2 of the second housing, where K is the division coefficient of the voltage divider;

- fixarea primei şi a celei de-a doua carcase pe un suport; - fixing the first and second housings on a support;

- montarea la o distanţă de la prima şi de la a doua carcase a carcasei a treia rotative, perpendicular acestora, de aceeaşi dimensiune şi structură cu cea de-a doua carcasă; - mounting at a distance from the first and second housings a third rotating housing, perpendicular thereto, of the same size and structure as the second housing;

- conectarea inelului conductor al primei carcase, la care este unit începutul conductorului bobinat, la o bornă liberă a unei bobine secundare cu numărul de spire W1 a unui transformator diferenţial, bobina fiind unită în serie cu o a doua bobină secundară a transformatorului cu numărul de spire W2=W1/K, punctul de conexiune a acestora fiind unit la masă, iar sfârşitul conductorului bobinat, care alunecă pe un electrod cu lungimea l, se uneşte la inelul conductor al carcasei a treia, unită printr-un contact alunecător cu borna liberă a bobinei secundare cu numărul de spire W2; - connecting the conductive ring of the first housing, to which the beginning of the coiled conductor is connected, to a free terminal of a secondary coil with the number of turns W1 of a differential transformer, the coil being connected in series with a second secondary coil of the transformer with the number of turns W2=W1/K, their connection point being connected to ground, and the end of the coiled conductor, which slides on an electrode with length l, is connected to the conductive ring of the third housing, connected by a sliding contact to the free terminal of the secondary coil with the number of turns W2;

- rebobinarea conductorului cu rezistenţa R2 de pe cea de-a doua carcasă pe carcasa a treia, care formează împreună cu rezistenţa R1 de pe prima carcasă şi bobinele secundare ale transformatorului o punte cu patru braţe, alimentată de la o sursă de semnal armonic, unită la bobina primară a transformatorului, iar indicatorul de echilibru al punţii este legat electric cu aceasta prin capacitatea C, formată de electrodul E şi conductor; - rewinding the conductor with resistance R2 from the second housing onto the third housing, which together with resistance R1 from the first housing and the secondary coils of the transformer forms a four-arm bridge, powered by a harmonic signal source, connected to the primary coil of the transformer, and the bridge balance indicator is electrically connected to it through the capacitance C, formed by the electrode E and the conductor;

- întreruperea rebobinării conductorului la atingerea egalităţii (R - R2)(U/K) = R2U, unde U şi U/K sunt tensiunile de pe bobinele cu numărul de spire şi respectiv; - interruption of the conductor rewinding upon reaching the equality (R - R2)(U/K) = R2U, where U and U/K are the voltages on the coils with the number of turns and respectively;

- la distanţa l/K de la marginea electrodului din partea carcasei a treia conductorul se taie; - at a distance l/K from the edge of the electrode on the third housing side, the conductor is cut;

- capătul liber al conductorului bobinat se lipeşte la inelul conductor liber al primei carcase, iar capătul liber al conductorului rebobinat se lipeşte la inelul conductor liber al carcasei a treia; - the free end of the wound conductor is glued to the free conductive ring of the first housing, and the free end of the rewound conductor is glued to the free conductive ring of the third housing;

- a doua carcasă se demontează de pe prima carcasă şi prima carcasă se uneşte cu cea de-a treia carcasă, formând divizorul de tensiune. - the second housing is removed from the first housing and the first housing is joined to the third housing, forming the voltage divider.

Conductorul se bobinează pe prima şi a doua carcase într-o direcţie cu acelaşi pas de depănare h, care se alege din condiţia: The conductor is wound on the first and second casings in one direction with the same winding pitch h, which is chosen from the condition:

unde D şi L sunt, respectiv, diametrul şi lungimea eficace sumară a carcaselor; r - rezistenţa liniară a conductorului. where D and L are, respectively, the diameter and the effective total length of the casings; r - the linear resistance of the conductor.

Invenţia se explică prin desenele din fig. 1-5, care reprezintă: The invention is explained by the drawings in Fig. 1-5, which represent:

- fig.1, conductorul cu rezistenţa sumară R = R1 + R2 = R1 + R1/K, bobinat pe prima şi a doua carcase, unite între ele; - fig.1, the conductor with the total resistance R = R1 + R2 = R1 + R1/K, wound on the first and second casings, joined together;

- fig.2, carcasa a treia, pe care în procesul de confecţionare a divizorului de tensiune se rebobinează porţiunea de conductor cu rezistenţa R2 = R1/K, bobinată pe carcasa a doua; - fig.2, the third casing, on which, during the process of making the voltage divider, the portion of conductor with resistance R2 = R1/K, wound on the second casing, is rewound;

- fig.3, schema electrică structurală ce explică principiul de măsurare a rezistenţelor R1 şi R2=R1/K prin schema unei punţi cu braţele formate din aceste rezistenţe şi două bobine secundare ale transformatorului diferenţial, unite între ele în serie; - fig.3, structural electrical diagram explaining the principle of measuring resistances R1 and R2=R1/K through the diagram of a bridge with arms formed by these resistances and two secondary coils of the differential transformer, connected together in series;

- fig.4, schema electrică echivalentă a punţii pe parcursul ajustării raportului rezistenţelor R1 şi R2 cu rebobinarea conductorului de pe carcasa a doua pe carcasa a treia; - fig.4, equivalent electrical diagram of the bridge during the adjustment of the ratio of resistances R1 and R2 with the rewinding of the conductor from the second housing to the third housing;

- fig.5, schema electrică echivalentă a punţii echilibrate la atingerea egalităţii U · (R1/K) = (U/K) · R1, care serveşte drept exemplu de realizare a invenţiei. - fig.5, the equivalent electrical diagram of the balanced bridge upon reaching the equality U · (R1/K) = (U/K) · R1, which serves as an example of the embodiment of the invention.

În fig. 1-5 sunt utilizate următoarele repere: 1 - prima carcasă, pe care se bobinează conductorul cu rezistenţa R1; 2 - carcasa a doua, pe care se bobinează conductorul cu rezistenţa R2 = R1/K; 3 - carcasa a treia, pe care se rebobinează conductorul cu rezistenţa R2 de pe carcasa 2 şi care la finisarea procedeului constituie braţul de rezistenţă joasă a divizorului de tensiune; 4 - transformatorul diferenţial cu bobina primară B1, unită cu o sursă de semnal armonic 14 şi cu două bobine secundare: B2 cu numărul de spire W1~R1 şi, respectiv, B3 cu numărul de spire W2=W1/K~R1/K, bobinele secundare fiind unite în serie, iar punctul de conexiune a acestora este unit la masă; 5 - rezistorul cu conductorul cu rezistenţa sumară R=R1+R2=R1+R1/K, bobinat pe carcasele 1 şi 2 unite între ele; 6 - conductorul; 7 - contactul alunecător, ce uneşte borna liberă a bobinei B3 cu inelul conductor al carcasei 3, la care ulterior se uneşte capătul conductorului dezlipit de la inelul carcasei 2; 8 - electrodul E, prin care se trage conductorul la rebobinarea lui de pe carcasa 2 pe carcasa 3; 9 - indicatorul de echilibru al punţii unit cu electrodul 8 şi masa; 10 - puntea cu patru braţe, formată de bobinele secundare B2, B3 ale transformatorului 4 şi rezistenţele R1, R2 ale conductorului; 11 - suportul, pe care se fixează rezistorul 5; 12 - mecanismul, în care se fixează carcasa 3 şi pe care o roteşte pe parcursul rebobinării; 13 - motorul electric, care roteşte mecanismul 12. In fig. 1-5 the following references are used: 1 - the first housing, on which the conductor with resistance R1 is wound; 2 - the second housing, on which the conductor with resistance R2 = R1/K is wound; 3 - the third housing, on which the conductor with resistance R2 from housing 2 is rewound and which, at the end of the process, constitutes the low resistance arm of the voltage divider; 4 - the differential transformer with the primary coil B1, connected to a harmonic signal source 14 and with two secondary coils: B2 with the number of turns W1~R1 and, respectively, B3 with the number of turns W2=W1/K~R1/K, the secondary coils being connected in series, and their connection point is connected to ground; 5 - the resistor with the conductor with the total resistance R=R1+R2=R1+R1/K, wound on housings 1 and 2 connected to each other; 6 - conductor; 7 - sliding contact, which connects the free terminal of the coil B3 with the conductive ring of the housing 3, to which the end of the conductor stripped from the housing ring 2 is subsequently connected; 8 - electrode E, through which the conductor is pulled when rewinding it from the housing 2 to the housing 3; 9 - bridge balance indicator connected to electrode 8 and the ground; 10 - four-arm bridge, formed by the secondary coils B2, B3 of the transformer 4 and the resistances R1, R2 of the conductor; 11 - support, on which the resistor 5 is fixed; 12 - mechanism, in which the housing 3 is fixed and which rotates during rewinding; 13 - electric motor, which rotates the mechanism 12.

Procedeul se efectuează în felul următor The procedure is carried out as follows:

Se bobinează continuu conductorul în izolaţie, de exemplu, microfirul în izolaţie de sticlă cu rezistenţa sumară R=R1+R2=R1+R1/K pe prima 1 şi a doua 2 carcase, cu lungimile eficace L1 şi L2, respectiv, unite între ele (vezi fig. 1). Pe capetele carcaselor 1 şi 2 sunt fixate inele conductoare A şi B. Bobinarea se efectuează prin distribuirea omogenă a conductorului cu rezistenţa R1 pe lungimea eficace L1 a carcasei 1 şi cu rezistenţa R2 = R1/K pe lungimea eficace L2 a carcasei 2, unde K este coeficientul de divizare a divizorului de tensiune. Carcasele 1 şi 2 se fixează pe suportul 11 orizontal (vezi fig. 3). În mecanismul 12 rotit de motorul 13, montate la o distanţă de la carcasele 1 şi 2, perpendicular acestora, se fixează carcasa 3, de aceeaşi dimensiune şi structură cu carcasa 2. Inelul conductor A al carcasei 1, la care este unit începutul conductorului bobinat, se conectează la o bornă liberă a bobinei secundare B2 cu numărul de spire W1 a transformatorului diferenţial 4, bobina B2 fiind unită în serie cu a doua bobină secundară B3 a transformatorului 4 cu numărul de spire W2=W1/K, punctul de conexiune a acestora fiind unit la masă. Se alimentează motorul electric 13 de la reţeaua electrică. Conductorul 6 de pe rezistorul 5 se trage de-a lungul axei acestuia. Pasul de depănare a conductorului pe carcasa 3 se alege egal cu pasul de depănare a acestuia pe carcasa 2. De asemenea şi numărul de rotaţii ale carcasei 3 se alege egal cu numărul de rotaţii ale rezistorului 5 la bobinarea acestuia. Conductorul 6 se trage prin electrodul 8, care concomitent este şi bridă a depunătorului de conductor pe carcasa 3. Sfârşitul conductorului 6 bobinat, care alunecă pe electrodul 8 cu lungimea l, se uneşte la inelul conductor al carcasei 3, unită prin contactul alunecător 7 cu borna liberă a bobinei secundare B3 cu numărul de spire W2. Conductorul cu rezistenţa R2 se rebobinează de pe carcasa 2 pe carcasa 3, care formează împreună cu rezistenţa R1 de pe carcasa 1 şi bobinele secundare B2 şi B3 ale transformatorului 4 o punte cu patru braţe, alimentată de la sursa de semnal armonic 14, unită la bobina primară B1 a transformatorului 4, iar indicatorul de echilibru 9 al punţii este legat electric cu aceasta prin capacitatea C, formată de electrodul 8 şi conductorul 6. Rebobinarea conductorului se întrerupe la echilibrarea punţii (vezi fig. 5), adică la atingerea egalităţii: The conductor in insulation, for example, glass-insulated microwire with the total resistance R=R1+R2=R1+R1/K, is continuously wound on the first 1 and second 2 housings, with the effective lengths L1 and L2, respectively, joined together (see Fig. 1). Conductor rings A and B are fixed on the ends of housings 1 and 2. The winding is carried out by homogeneously distributing the conductor with the resistance R1 on the effective length L1 of housing 1 and with the resistance R2 = R1/K on the effective length L2 of housing 2, where K is the division coefficient of the voltage divider. Housings 1 and 2 are fixed on the horizontal support 11 (see Fig. 3). In the mechanism 12 rotated by the motor 13, mounted at a distance from the housings 1 and 2, perpendicular to them, the housing 3 is fixed, of the same size and structure as the housing 2. The conductive ring A of the housing 1, to which the beginning of the wound conductor is connected, is connected to a free terminal of the secondary coil B2 with the number of turns W1 of the differential transformer 4, the coil B2 being connected in series with the second secondary coil B3 of the transformer 4 with the number of turns W2=W1/K, their connection point being connected to ground. The electric motor 13 is powered from the electrical network. The conductor 6 on the resistor 5 is pulled along its axis. The conductor winding step on the housing 3 is chosen equal to the winding step on the housing 2. Also, the number of turns of the housing 3 is chosen equal to the number of turns of the resistor 5 when winding it. The conductor 6 is pulled through the electrode 8, which is also the clamp of the conductor depositor on the housing 3. The end of the wound conductor 6, which slides on the electrode 8 with a length of l, is connected to the conductor ring of the housing 3, connected by the sliding contact 7 to the free terminal of the secondary coil B3 with the number of turns W2. The conductor with resistance R2 is rewound from the housing 2 to the housing 3, which forms together with the resistance R1 on the housing 1 and the secondary coils B2 and B3 of the transformer 4 a four-arm bridge, powered by the harmonic signal source 14, connected to the primary coil B1 of the transformer 4, and the balance indicator 9 of the bridge is electrically connected to it through the capacitance C, formed by the electrode 8 and the conductor 6. The conductor rewinding is interrupted when the bridge is balanced (see Fig. 5), i.e. when the equality is reached:

(R - R2)(U/K) = R2U, (R - R2)(U/K) = R2U,

unde U şi U/K sunt tensiunile de pe bobinele B2 şi B3 cu numărul de spire şi respectiv. Atingerea egalităţii este indicată de indicatorul 9, deoarece curentul ce trece prin acesta devine nul. La distanţa l/K de la marginea electrodului 8 din partea carcasei 3 conductorul 6 se taie. Capătul liber al conductorului bobinat se lipeşte la inelul conductor liber al carcasei 1, iar capătul liber al conductorului rebobinat se lipeşte la inelul conductor liber al carcasei 3. Carcasa 2 se demontează de la carcasa 1. Ultima se uneşte cu carcasa 3, formând divizorul de tensiune. where U and U/K are the voltages on the coils B2 and B3 with the number of turns and respectively. The achievement of equality is indicated by the indicator 9, since the current passing through it becomes zero. At a distance l/K from the edge of the electrode 8 on the side of the housing 3, the conductor 6 is cut. The free end of the wound conductor is soldered to the free conductive ring of the housing 1, and the free end of the rewound conductor is soldered to the free conductive ring of the housing 3. The housing 2 is dismantled from the housing 1. The latter is joined to the housing 3, forming the voltage divider.

Eroarea coeficientului de divizare K al divizorului de tensiune este determinată de precizia de stabilire a raportului numărului de spire ale bobinelor B2 şi B3, care, după cum se ştie, poate fi de miimi de procente. The error of the division coefficient K of the voltage divider is determined by the accuracy of establishing the ratio of the number of turns of coils B2 and B3, which, as is known, can be thousandths of a percent.

1. Рождественская Т.Б., Зорин Д.И., Бродский А.М. Новая модель высокоомного шестикаскадного компаратора. Измерительная техника, 1961, №6 1. Rozhdestvenskaya T.B., Zorin D.I., Brodsky A.M. New model of high-resistance six-stage comparator. Measuring technique, 1961, №6

2. Зеликовский З.Н. Входные делители напряжения для цифровых вольтметров и их проверка. Микропровод и приборы сопротивления. Кишинев, 1962 2. Зеликовский З.Н. Input voltage dividers for digital voltmeters and their verification. Микропровод и приборы сопротивления. Chişinău, 1962

Claims (2)

1. Procedeu de confecţionare a divizorului de tensiune rezistiv, care constă în: - bobinarea continuă a conductorului în izolaţie, de exemplu, a microfirului în izolaţie de sticlă, cu rezistenţa sumară R=R1+R2=R1+R1/K pe prima şi a doua carcase, cu lungimile eficace L1 şi L2, respectiv, unite între ele, pe capetele cărora sunt fixate inele conductoare, totodată bobinarea se efectuează prin distribuirea omogenă a conductorului cu rezistenţa R1 pe lungimea eficace L1 a primei carcase şi cu rezistenţa R2 = R1/K pe lungimea eficace L2 a carcasei a doua, unde K este coeficientul de divizare a divizorului de tensiune; - fixarea primei şi a celei de-a doua carcase pe un suport; - montarea la o distanţă de la prima şi de la a doua carcase a carcasei a treia rotative, perpendicular acestora, de aceeaşi dimensiune şi structură cu cea de-a doua carcasă; - conectarea inelului conductor al primei carcase, la care este unit începutul conductorului bobinat, la o bornă liberă a unei bobine secundare cu numărul de spire W1 a unui transformator diferenţial, bobina fiind unită în serie cu o a doua bobină secundară a transformatorului cu numărul de spire W2=W1/K, punctul de conexiune a acestora fiind unit la masă, iar sfârşitul conductorului bobinat, care alunecă pe un electrod cu lungimea l, se uneşte la inelul conductor al carcasei a treia, unită printr-un contact alunecător cu borna liberă a bobinei secundare cu numărul de spire W2; - rebobinarea conductorului cu rezistenţa R2 de pe cea de-a doua carcasă pe carcasa a treia, care formează împreună cu rezistenţa R1 de pe prima carcasă şi bobinele secundare ale transformatorului o punte cu patru braţe, alimentată de la o sursă de semnal armonic, unită la bobina primară a transformatorului, iar indicatorul de echilibru al punţii este legat electric cu aceasta prin capacitatea C, formată de electrodul E şi conductor; - întreruperea rebobinării conductorului la atingerea egalităţii (R - R2)(U/K) = R2U, unde U şi U/K sunt tensiunile de pe bobinele cu numărul de spire şi respectiv; - la distanţa l/K de la marginea electrodului din partea carcasei a treia conductorul se taie; - capătul liber al conductorului bobinat se lipeşte la inelul conductor liber al primei carcase, iar capătul liber al conductorului rebobinat se lipeşte la inelul conductor liber al carcasei a treia; - a doua carcasă se demontează de pe prima carcasă şi prima carcasă se uneşte cu cea de-a treia carcasă, formând divizorul de tensiune.1. Process for manufacturing a resistive voltage divider, which consists of: - continuous winding of the conductor in insulation, for example, of microwire in glass insulation, with the total resistance R=R1+R2=R1+R1/K on the first and second housings, with the effective lengths L1 and L2, respectively, joined together, on the ends of which conductive rings are fixed, at the same time the winding is carried out by homogeneously distributing the conductor with the resistance R1 on the effective length L1 of the first housing and with the resistance R2 = R1/K on the effective length L2 of the second housing, where K is the voltage divider division coefficient; - fixing the first and second housings on a support; - mounting at a distance from the first and second housings of the third rotating housing, perpendicular to them, of the same size and structure as the second housing; - connecting the conductive ring of the first housing, to which the beginning of the coiled conductor is connected, to a free terminal of a secondary coil with the number of turns W1 of a differential transformer, the coil being connected in series with a second secondary coil of the transformer with the number of turns W2=W1/K, their connection point being connected to ground, and the end of the coiled conductor, which slides on an electrode with length l, is connected to the conductive ring of the third housing, connected by a sliding contact to the free terminal of the secondary coil with the number of turns W2; - rewinding the conductor with resistance R2 from the second housing onto the third housing, which together with resistance R1 from the first housing and the secondary coils of the transformer forms a four-arm bridge, powered by a harmonic signal source, connected to the primary coil of the transformer, and the balance indicator of the bridge is electrically connected to it through the capacitance C, formed by the electrode E and the conductor; - interrupting the rewinding of the conductor upon reaching the equality (R - R2)(U/K) = R2U, where U and U/K are the voltages on the coils with the number of turns and respectively; - at a distance l/K from the edge of the electrode from the third housing side, the conductor is cut; - the free end of the wound conductor is glued to the free conductive ring of the first housing, and the free end of the rewound conductor is glued to the free conductive ring of the third housing; - the second housing is removed from the first housing and the first housing is joined to the third housing, forming the voltage divider. 2. Procedeu, conform revendicării 1, în care conductorul se bobinează pe prima şi a doua carcase într-o direcţie cu acelaşi pas de depănare h, care se alege din condiţia: , unde D şi L sunt, respectiv, diametrul şi lungimea eficace sumară a carcaselor; r - rezistenţa liniară a conductorului.2. Method according to claim 1, in which the conductor is wound on the first and second casings in a direction with the same winding pitch h, which is chosen from the condition: , where D and L are, respectively, the diameter and the effective total length of the casings; r - the linear resistance of the conductor.
MDS20110173A 2011-10-19 2011-10-19 Method for manufacture of resistive voltage divider MD603Z (en)

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