JP5414404B2 - Coil for standard voltage measurement of watt-hour meter - Google Patents

Description

  The present invention relates to a voltage measuring coil of a watt hour meter that measures a voltage input to the watt hour meter.

  When a lightning surge enters the high-voltage distribution line, the lightning surge moves to the low-voltage side via the pole transformer and enters the input terminal of the watt-hour meter. For this reason, conventionally, in the watt-hour meter disclosed in Patent Document 1, a protection circuit unit is provided at the power supply side terminal, and a lightning surge that enters the watt-hour meter flows to the ground. Further, in the watt-hour meter disclosed in Patent Document 2, an arc current-limiting cap is provided at the power-source side terminal, and the arc continuity generated at the power-side terminal due to a lightning surge entering the watt-hour meter is The arc is extinguished by the cap.

  In addition, in order to protect the watt hour meter from lightning surges, there is a conventional one that uses a lightning surge reinforced type for the voltage measuring coil of the watt hour meter to enhance insulation of the watt hour meter. FIG. 1A is a front view of the lightning surge-enhanced voltage measuring coil 1, and FIG. 1B is a sectional view taken along the line Ib-Ib in FIG. In the voltage measuring coil 1, the two terminals 2 and 2 are inserted into the winding frame 3, and the electric wire 4 is wound around the winding frame 3 after the start end of the electric wire 4 is entangled with one terminal 2. The electric wire 4 is entangled with the other terminal 2 at the terminal end and cut. When a lightning surge is applied to both terminals 2 and 2, the largest voltage is applied to the start and end of the electric wire 4 to discharge between both terminals 2 and 2, and between the electric wires 4 in the voltage measuring coil 1. In other words, there is a case of discharging between windings. However, the lightning surge-enhanced voltage measuring coil 1 is impregnated with the resin 5 so as not to discharge between the start and end of the electric wire 4 or between the windings, and withstands even if a large lightning surge voltage is applied. Has insulation strength. In addition, there are magnetic collecting iron cores at the center and both sides of the voltage measuring coil 1, and the iron core is connected to the meter metal base of the watt hour meter. And electric wire 4 wound around the outer periphery. However, the lightning surge enhanced voltage measuring coil 1 can withstand lightning surge voltages generated between the ground because the outer periphery of the electric wire 4 is also covered with the resin 5.

  FIG. 2 is a manufacturing process diagram of the lightning surge enhanced voltage measuring coil 1 described above. In manufacturing, first, in step (hereinafter referred to as S) 1, a winding operation is performed in which a coil 4 is manufactured by winding an electric wire 4 around a winding frame 3. Next, in S <b> 2, a mold insertion operation for fitting the coil into a mold for impregnating the coil with the resin 5 is performed. Next, in S3, a resin injection operation for injecting the resin 5 into the mold into which the coil is fitted is performed. Subsequently, in S4, a heat curing operation for heating and solidifying the resin 5 injected into the mold is performed. Next, in S5, a mold release / finishing operation for removing the burr of the cured resin by taking out the coil from the mold is performed. Finally, in S6, lead wire soldering work for soldering the lead wires to both terminals 2 and 2 is performed, and the lightning surge enhanced voltage measuring coil 1 with enhanced insulation is completed.

JP-A-11-153621 JP-A-9-74621

  However, in order to manufacture the lightning surge-enhanced voltage measuring coil 1 shown in FIG. 1 of the prior art, it is necessary to manufacture a standard voltage measuring coil that does not perform insulation reinforcement against the lightning surge voltage. In addition to the winding work process of S1 and the lead wire soldering work process of S6, a work process of impregnating the resin 5 of S2 to S5 to reinforce insulation is required. For this reason, as compared with the case of manufacturing a standard voltage measuring coil, the time taken from the introduction of parts to the production line until the voltage measuring coil 1 is completed, that is, the lead time becomes longer. In addition, the voltage measurement coil 1 after impregnating the resin 5 needs to have the same external dimensions as a standard voltage measurement coil because of the assembly relationship with other parts. The winding frame 3 and the terminal 2 constituting the coil 1 are different in size from standard voltage measuring coil components having a higher production volume. For this reason, it becomes a factor of the rise in production management cost, and the cost increase of the component parts by small-volume production.

The present invention has been made to solve such problems,
Both ends of the windings to measure the voltage inputted to the power meter is electrically connected to the voltage terminal of the energy meter by a lead wire is tied to the pair of coil terminals, a core around the windings In the standard voltage measuring coil of the watt-hour meter configured ,
A pair of discharge electrodes having a contact portion that contacts the winding terminal and is electrically connected to the voltage terminal of the watt hour meter together with the winding terminal by a lead wire, and the distance between the discharge electrodes is set to a predetermined distance A discharge unit including a space in which the discharge electrode is held, an arm inserted into a gap between the winding and the iron core, and a holding member having a latch portion provided at the tip of the arm. It is characterized by.

According to this configuration, the discharge includes a pair of discharge electrodes that are electrically connected to both ends of the winding, and a holding member that holds the discharge electrodes by setting the distance between the discharge electrodes to a predetermined distance. The unit is provided in the standard voltage measuring coil of the watt-hour meter. For this reason, the distance between the electrodes of the discharge electrode is set to a predetermined distance at which the discharge is performed with the lowest surge voltage in the standard voltage measurement coil by the holding member, so that the lightning surge applied to the watt-hour meter is standard. Before the voltage measurement coil is discharged by dielectric breakdown between both ends and windings, the discharge is performed between the electrodes of the discharge electrode. Therefore, even with a lightning surge large enough to break down the lightning surge strengthening coil, the voltage measurement function can be maintained only by increasing the damage to the discharge electrode. The discharge unit having the discharge electrode can be manufactured in parallel with the standard voltage measurement coil in a separate manufacturing process from the standard voltage measurement coil. Therefore, unlike conventional lightning surge-enhanced voltage measurement coils, a manufacturing process for reinforcing insulation such as impregnating coil windings with resin after the winding work process is not required, thus enhancing lightning surge resistance. In addition, the lead time of the standard voltage measuring coil can be shortened. Furthermore, since a standard voltage measuring coil with a large production volume is used, the manufacturing cost can be reduced. In addition, when the watt hour meter is repaired, the damaged discharge unit can be replaced, and the maintainability is improved.

Further, according to this configuration, since the discharge electrodes are electrically connected to each end of both winding and lead wire can be connected to the discharge unit manufactured in parallel more quickly to the standard voltage measuring coil. For this reason, the lead time of the standard voltage measuring coil with enhanced lightning surge resistance can be further shortened.

  In addition, the present invention is characterized in that the discharge electrode has a distance from which discharge is performed in a space between the electrodes from a surrounding member.

  According to this configuration, since the discharge electrode is spaced from the surrounding members by the distance that is discharged in the space between the electrodes, and the lightning surge is discharged in the space between the electrodes, compared with the case of discharging along the creepage of the insulator Insulation deterioration after discharge can be kept small. For this reason, lightning surge can be repeatedly discharged by the discharge electrode.

  Further, the present invention is characterized by comprising a plurality of pairs of discharge electrodes.

  According to this configuration, since a plurality of pairs of discharge electrodes are provided, even if a certain discharge electrode pair is consumed due to a plurality of discharges, other discharge electrode pairs can function instead. The discharge function can be maintained for a longer period than in the case of a pair of discharge electrodes.

  Further, the present invention is characterized in that the discharge electrode is built in the watt hour meter in a manner that is visible from the outside of the watt hour meter.

  According to this configuration, since the discharge electrode is visually recognized from the outside of the watt hour meter, the damaged state of the discharge electrode is observed from the outside of the watt hour meter. For this reason, it is possible to detect damaged instruments at an early stage, and investigation of the cause of the failure does not require time.

  Further, the present invention is characterized in that the discharge electrode is formed as one component and divided immediately before being assembled to the holding member.

  According to this configuration, since the discharge electrode is formed as a single part and divided immediately before being assembled to the holding member, the discharge electrodes are entangled during parts transportation during the manufacturing process of the discharge unit. The deformation of the electrode can be reduced, and the product quality is stabilized.

According to the present invention, as described above, the lead time of the standard voltage measuring coil with enhanced lightning surge resistance can be shortened. Furthermore, since a standard voltage measuring coil with a large production volume is used, the manufacturing cost can be reduced. In addition, when the watt hour meter is repaired, the damaged discharge unit can be replaced, and the maintainability is improved.

(A) is a front view of the conventional coil for lightning surge reinforced voltage measurement, (b) is a sectional view taken along the line Ib-Ib of (a). It is a manufacturing-process figure of the conventional lightning surge reinforced type voltage measuring coil shown in FIG. (A) is a front view of the three-phase three-wire watt-hour meter provided with the coil for voltage measurement by one Embodiment of this invention, (b) is a partially broken side view of (a). (A) is a front view of the coil for voltage measurement shown in FIG. 3, (b) is a sectional view taken along the line IVb-IVb in FIG. (A) is a front view of the coil for voltage measurement shown in FIG. 4 that does not include a discharge unit, and (b) is a cross-sectional view taken along line Vb-Vb in FIG. It is a disassembled perspective view of the discharge unit with which the coil for voltage measurement shown in FIG. 4 is provided. (A) is a perspective view at the time of component formation of the discharge electrode shown in FIG. 6, (b) is a perspective view when the component shown in (a) is divided into discharge electrodes. 6 is a perspective view when the voltage measurement coil shown in FIG. 5 is assembled with the discharge unit shown in FIG. It is a manufacturing-process figure of the coil for voltage measurement by one Embodiment of this invention. It is a perspective view at the time of mounting | wearing and assembling the discharge unit by which the insulation reinforcement | strengthening between the ground was given to the voltage measurement coil shown in FIG.

  Next, an embodiment for carrying out the present invention will be described.

  FIG. 3A is a front view of a three-phase three-wire watt-hour meter 11 having a voltage measuring coil according to an embodiment of the present invention, and FIG. 3B is a part of FIG. FIG.

  The watt hour meter 11 includes a steel base 13 covered with a glass cover 12 and a measuring unit that measures the amount of electric power. A terminal block 14 is provided below the base 13. The terminal block 14 includes three power terminals 1S, 2S, 3S connected to the power supply side electric wires, and three load terminals 1L, 2L, 3L connected to the load side electric wires. The power terminal 1S is electrically connected to the first internal terminal 15a, and the power terminal 3S is electrically connected to the second internal terminal 15b. Further, although not shown in the figure, the power supply terminal 2S is connected to the load terminal 2L inside the measuring unit.

  In the measuring section covered with the glass cover 12, voltage measuring coils 16 and 17 for measuring a voltage input to the watt hour meter 11 are provided. One end of the voltage measuring coil 16 is connected to the power supply terminal 1S via the first internal terminal 15a by the lead wire 18a, and the other end is connected to the power supply terminal 2S via the load terminal 2L by the lead wire 18b. Yes. Similarly, one end of the voltage measuring coil 17 is connected to the power supply terminal 3S via the second internal terminal 15b by the lead wire 19a, and the other end is connected to the power supply terminal 2S via the load terminal 2L by the lead wire 19b. It is connected. Therefore, among the three-phase voltages input to the watt hour meter 11, the voltage measuring coil 16 measures the voltage between the power supply terminals 1S and 2S, and the voltage measuring coil 17 measures the voltage between the power supply terminals 2S and 3S. Each voltage measuring coil 16, 17 is provided with a discharge unit 20, 20 on the side facing each side of the glass cover 12.

  4A is a front view of the voltage measuring coils 16 and 17 including the discharge unit 20, and FIG. 4B is a sectional view taken along the line IVb-IVb in FIG. 4A. .

  The voltage measurement coils 16 and 17 have the same structure, and are configured by attaching the discharge unit 20 to the standard voltage measurement coil 30. 5A is a front view, FIG. 5B is a sectional view taken along the line Vb-Vb in FIG. 5A, and the coil 31 has two plates. The shaped terminals 32, 32 are inserted and configured. The electric wire 33 is wound around the winding frame 31 after the starting end is entangled with one plate-like terminal 32, and is entangled with the other plate-like terminal 32 at the end. Thereafter, the exterior tape 34 is wound around the electric wire 33 to manufacture the standard voltage measuring coil 30.

An exploded perspective view of the discharge unit 20 is shown in FIG. The discharge unit 20 includes discharge electrodes 24a and 24b formed by bending a brass plate and an electrode holding member 25 formed by molding an insulating plastic resin or the like. The electrode holding member 25 is provided with two mounting arms 25a and 25a at the left and right upper ends, and latches 25b and 25b are provided at the tips of the mounting arms 25a and 25a. In addition, each below the respective mounting arm 25a, 25a, the supported body 25c, 25c are provided each having a protrusion 25c ₁ to the rear side. Press-fit portions 25d and 25d into which discharge electrodes 24a and 24b are press-fitted are provided between the supported bodies 25c and 25c, respectively, and a discharge space 25e is provided between the press-fit portions 25d and 25d.

  FIG. 7A is a perspective view when the front part 24 including the discharge electrodes 24a and 24b is formed, and FIG. 7B is a perspective view when the front part 24 shown in FIG. is there.

The front part 24 is formed as one part as shown in FIG. 5A, and is a left and right integrated type until the press / plating process. Thereafter, the front part 24 is cut as shown in FIG. 2B just before being assembled to the electrode holding member 25 in an automatic machine for assembling the discharge electrodes 24a and 24b to the electrode holding member 25, and the two discharge electrodes 24a, 24b is divided into parts. The divided discharge electrodes 24a and 24b are press-fitted into the press-fitting parts 25d and 25d by an automatic machine immediately after that. And indented one discharge electrode 24a and the other discharge electrode 24b, a pair of electrodes 24a ₁ which is electrically connected to both ends of the formed winding an electric wire 33 and the electrode 24b _1, and the pair of electrodes 24a ₂ and a electrode 24b ₁ and.

The distance between the electrodes of each pair is a predetermined distance in which the discharge electrodes 24a and 24b are press-fitted into the press-fit portions 25d and 25d, so that the electrode holding member 25 discharges with the lowest surge voltage in the voltage measuring coils 16 and 17. Set to distance. Electrode holding member 25 is to set the electrodes 24a ₁ and the electrode 24b _1, and each inter-electrode distance of the electrodes 24a ₂ and the electrode 24b ₁ to a predetermined distance, the discharge electrodes 24a, and a holding member for holding the 24b Yes. In the present embodiment, each electrode 24a ₁ , 24a ₂ , 24b ₁ has a distance that is discharged in the space 25e between the electrodes from the surrounding member, and creeping discharge does not occur between the surrounding members. Is set to Further, the discharge unit 20 is provided on the side surface of the glass cover 12 as shown in FIG. 3 so that the state of each of the electrodes 24a ₁ , 24a ₂ , 24b ₁ can be visually recognized from the outside. It is built in the watt-hour meter 11 in a mode that is visually recognized.

The discharge unit 20 into which the discharge electrodes 24a and 24b are press-fitted is attached to a standard voltage measuring coil 30 as shown in FIG. In this mounting operation, first, the latch portions 25b and 25b at the tips of the mounting arms 25a and 25a shown in FIG. 5A are cut so as to create a gap between the standard voltage measuring coil 30 and the iron core 26, respectively. Inserted into the notch 26a, the discharge unit 20 is pushed into the standard voltage measuring coil 30 side. At this time, the supported body 25c, each protrusion 25c ₁ of 25c, that is fitted in a hole formed in a steel core support 27 for supporting the core 26 to the base 13, a standard voltage measuring coil The discharge unit 20 is positioned with respect to 30 and the discharge unit 20 is attached to the standard voltage measuring coil 30 as shown in FIG. Thereafter, the recesses 24c and 24c formed at the ends of the discharge electrodes 24a and 24b are brought into contact with the tips of the plate terminals 32 and 32, respectively. 11 is connected with the other ends of the lead wires 18 and 19 (see FIG. 3), one end of which is electrically connected to the voltage terminals 1S, 2S and 3S, and is electrically connected to each end of the wire 33. Is done. As a result, the standard voltage measuring coil 30 constituting the voltage measuring coil 16 has both ends of the winding electrically connected to the voltage terminals 1S and 2S of the wattmeter 11 together with the discharge electrodes 24a and 24b by the lead wires 18a and 18b. Connected. The standard voltage measuring coil 30 constituting the voltage measuring coil 17 has both ends of the winding electrically connected to the voltage terminals 2S and 3S of the wattmeter 11 together with the discharge electrodes 24a and 24b by lead wires 19a and 19b. Connected to.

  FIG. 9 is a manufacturing process diagram of the above-described voltage measuring coils 16 and 17 according to the present embodiment. When the voltage measuring coils 16 and 17 are manufactured, first, in S11, a winding operation is performed in which the electric wire 33 is wound around the winding frame 31 and the outer periphery of the electric wire 33 is covered with the exterior tape 34 to manufacture the standard voltage measuring coil 30. Done. In parallel with S11, in S21, the front part 24 is divided into two discharge electrodes 24a and 24b and press-fitted into the electrode holding member 25 to manufacture the discharge unit 20. Finally, in S12, a lead wire soldering operation is performed in which the discharge unit 20 manufactured in S21 is attached to the standard voltage measuring coil 30 manufactured in S11, and the lead wires 18 and 19 are soldered to the plate terminals 32 and 32. The voltage measuring coils 16 and 17 having the discharge unit 20 are completed.

According to the voltage measuring coils 16 and 17 of the watt hour meter 11 according to this embodiment, the pair of electrodes 24a ₁ and 24b ₁ electrically connected to both ends of the winding of the electric wire 33, and the pair of electrodes A discharge unit 20 including 24a ₂ and 24b ₁ and an electrode holding member 25 that holds the discharge electrodes 24a and 24b by setting the distance between the electrodes to a predetermined distance is a standard of the wattmeter 11 The voltage measuring coil 30 is provided. For this reason, the interelectrode distance of the discharge electrodes 24a and 24b is set to a predetermined distance at which the voltage measurement coils 16 and 17 discharge at the lowest surge voltage by the electrode holding member 25, so The applied lightning surge is discharged between the electrodes of the discharge electrodes 24a and 24b before the voltage measurement coils 16 and 17 and the windings are discharged by dielectric breakdown. Therefore, even with a lightning surge large enough to break down the lightning surge strengthening coil, the voltage measurement function can be maintained only by increasing the damage to the discharge electrodes 24a and 24b. In other words, as long as the discharge value between the electrodes of the discharge electrodes 24a and 24b is smaller than the value at which both ends of the voltage measurement coils 16 and 17 and the windings are broken and discharged, the function as the voltage measurement coil is maintained. Even a lightning surge that breaks the voltage measuring coils 16 and 17 does not cause a malfunction with a single blow. Further, the discharge unit 20 having the discharge electrodes 24a and 24b is manufactured in parallel with the standard voltage measuring coil 30 in the manufacturing process of the standard voltage measuring coil 30 of FIG. Can do. Accordingly, as in the conventional lightning surge enhanced voltage measuring coil 1 (see FIG. 1), after the winding work process in FIGS. 2 and S1, the insulation is enhanced by impregnating the coil winding with resin. Since the manufacturing process of S5 becomes unnecessary, the lead time of the voltage measuring coils 16 and 17 with enhanced lightning surge resistance can be shortened. Furthermore, since the standard voltage measuring coil 30 having a large production volume is used, the manufacturing cost can be suppressed, and a production system for reducing the inventory as much as possible can be adopted. In addition, when the watt hour meter 11 is repaired, the damaged discharge unit 20 can be replaced, and the maintainability is improved.

  Further, according to the voltage measuring coils 16 and 17 of the watt-hour meter 11 according to the present embodiment, the discharge electrodes 24 a and 24 b are electrically connected to each end of the winding of the electric wire 33 together with the other ends of the lead wires 18 and 19. Therefore, the discharge unit 20 manufactured in parallel with S11 in FIG. 9 and S21 can be connected to the standard voltage measuring coil 30 more quickly. For this reason, the lead time of the voltage measuring coils 16 and 17 with enhanced lightning surge resistance can be further shortened.

In addition, when the discharge unit 20 performs creeping discharge, the insulator deteriorates during the creeping discharge, and at the next lightning strike, a smaller value is discharged, and the insulation strength as a normal function cannot be maintained. However, according to the voltage measuring coils 16 and 17 of the electricity meter 11 of the present embodiment, the discharge electrodes 24a, 24b are electrodes 24a ₁ and the electrode 24b _1, and in the space 25e between the electrodes 24a ₂ and the electrode 24b ₁ distance to be discharged is opened from the surrounding member, because the lightning surge discharge in the space 25e between the electrodes 24a ₁ and the electrode 24b ₁ or the electrode 24a ₂ and the electrode 24b _1,, compared with the case of discharge in the creepage insulator Thus, the insulation deterioration after the discharge can be suppressed to a small level, and the discharge does not deteriorate significantly by a single discharge. For this reason, a lightning surge can be repeatedly discharged by the discharge electrodes 24a and 24b.

Further, according to the voltage measuring coils 16 and 17 of the watt hour meter 11 according to the present embodiment, the discharge electrodes 24a and 24b include a plurality of pairs of electrodes 24a ₁ and 24b ₁ and electrodes 24a ₂ and 24b ₁ . Therefore, even if the tips of a certain discharge electrode pair, for example, the electrodes 24a ₁ and 24b ₁ are slightly evaporated and consumed due to the high temperature at the time of discharge due to a plurality of discharges, Since 24a ₂ and 24b ₁ function instead, the discharge function can be maintained over a longer period than in the case of a pair of discharge electrodes.

  In addition, according to the voltage measuring coils 16 and 17 of the watt hour meter 11 according to the present embodiment, since the discharge electrodes 24a and 24b are visually recognized from the outside of the watt hour meter 11, the damaged state of the discharge electrodes 24a and 24b is determined by the power. Observed from outside the meter 11. For this reason, it is possible to detect damaged instruments at an early stage, and investigation of the cause of the failure does not require time.

  Further, according to the voltage measuring coils 16 and 17 of the watt-hour meter 11 according to the present embodiment, the discharge electrodes 24 a and 24 b are formed as one front part 24 and immediately before the discharge electrode 24 a is assembled to the electrode holding member 25. , 24b, so that the discharge electrodes 24a, 24b are entangled with each other in a plating process for plating the discharge electrodes 24a, 24b during the manufacturing process of the discharge unit 20 or in a physical distribution process such as when parts are transported. The deformation of the discharge electrodes 24a and 24b can be reduced, and the product quality is stabilized.

  In addition, according to the present embodiment, when the front part 24 is divided into the discharge electrodes 24a and 24b, the material removal from the standard plate as the raw material is as shown in FIG. Is done. For this reason, there is less waste material and the scrap rate is reduced.

  Further, according to the present embodiment, even if a lightning surge having a value that causes dielectric breakdown between the ends of the lightning surge-enhanced voltage measuring coils 16 and 17 and between the windings enters the wattmeter 11, the discharge It is only necessary to increase the amount of damage to the discharge electrodes 24a and 24b in the unit 20.

  In addition, other different discharge locations other than the voltage measuring coils 16 and 17 include terminal portions such as power supply terminals 1S, 2S, and 3S and load terminals 1L, 2L, and 3L. In particular, when the watt-hour meter 11 is a three-phase three-wire type as in the present embodiment, since a three-phase voltage is applied side by side in the terminal portion, there is a risk of spreading to a three-phase short circuit if short-circuited between two poles. There is sex. However, according to the present embodiment, since the voltage measuring coils 16 and 17 are arranged separately on the left and right of the watt hour meter 11, the insulation strength of the terminal portion is set higher than the discharge value of the discharge unit 20, If the discharge unit 20 is always discharged, there is no possibility of shifting to a three-phase short circuit, and safety is improved.

  Note that the discharge unit 20 of the voltage measuring coils 16 and 17 according to the above-described embodiment may be configured as shown in FIG. 10 to enhance the insulation of lightning surge between the ground. In the figure, the same or corresponding parts as in FIG.

Shown in FIG. 6 (a), when the gap d ₁ between the standard voltage measuring coil 30 and the iron core 26 is small, the longitudinal length of the electrode holding member 25 as compared with those of the above embodiment, FIG. extending _{d 2} minutes downwardly as shown in (b). Then, the left and right lower end of the the extended electrode holding member 25, the latch portion _25b 1, 25b ₁ 2 pieces of mounting arms _25a 1 having, 25a ₁ is provided, each mounting arm 25a, between 25a _1, plastic Wings 25f and 25f made of resin or the like are provided. These wings 25f, 25f, each latch portion 25b, 25b, and when _{the 25b} 1, 25b ₁ is inserted into the notch 26a of the core 26 is inserted into the gap _{d 1} between the standard voltage measuring coil 30 and the iron core 26 The Also with this configuration, the same effects as those of the above-described embodiment can be obtained, and further, insulation against lightning surge between the grounds can be strengthened by the blades 25f and 25f.

  In the above embodiment, the case where the present invention is applied to the voltage measuring coil of the three-phase three-wire watt-hour meter has been described, but the voltage of other watt-hour meters such as a single-phase three-wire type and a single-phase two-wire type It is also possible to apply the present invention to a measuring coil. Even in this case, the same effects as those of the above-described embodiment can be obtained.

DESCRIPTION OF SYMBOLS 11 ... Three-phase three-wire watt-hour meter 16, 17 ... Lightning surge strengthening type voltage measuring coil 18a, 18b, 19a, 19b ... Lead wire 20 ... Discharge unit 24 ... Front part 24a, 24b ... Discharge electrode 24a ₁ , 24a ₂ , 24b ₁ ... electrode 25 ... electrode holding member 25e ... discharge space 30 ... coil for standard voltage measurement 32 ... plate-like terminal

Claims (5)

Both ends of the windings to measure the voltage inputted to the power meter is electrically connected to the voltage terminal of the energy meter by a lead wire is tied to the pair of winding terminals, the core around the windings In the standard voltage measuring coil of the watt hour meter configured with
A pair of discharge electrodes having a contact portion that contacts the winding terminal and is electrically connected to the voltage terminal of the watt hour meter together with the winding terminal by the lead wire, and a distance between the discharge electrodes is predetermined. And a holding member having a latch portion provided at the tip of the arm, a space in which the discharge electrode is held at a distance, an arm inserted into a gap between the winding and the iron core A coil for standard voltage measurement of a watt-hour meter, characterized by comprising a discharged unit. The watt-hour meter standard voltage measuring coil according to claim 1, wherein the discharge electrode has a distance to be discharged in a space between the electrodes from surrounding members. The standard voltage measuring coil of the watt-hour meter according to claim 1 or 2 , wherein a plurality of pairs of the discharge electrodes are provided. The standard voltage of the watt-hour meter according to any one of claims 1 to 3 , wherein the discharge electrode is built in the watt-hour meter so as to be visually recognized from the outside of the watt-hour meter. Coil for measurement. The standard voltage measurement of the watt-hour meter according to any one of claims 1 to 4 , wherein the discharge electrode is formed as one component and divided immediately before being assembled to the holding member. Coil.

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