JP2017123419A - Protective relay device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow for connection of the terminal of a terminal board and the primary winding of an assistance transformer by flow soldering.SOLUTION: In a protective relay device 10, a terminal board 12 includes an insulation member 30 in which first and second holes 32, 33 reaching a printed board 40 are formed, and first and second terminals 13A, 13B fixed to the insulation member 30. The ends of the first and second terminals 13A, 13B penetrate the printed board 40 and project to the back side thereof. The printed board is provided with through holes continuous to the first and second holes, respectively. The ends 26A, 26B of a coated wire, used as the primary winding 21 of an assistance transformer 20, are inserted into the holes 32, 33, respectively, and the core wires thereof penetrate the through holes and project to the back side of the printed board 40, before being locked to the locking portions provided at the ends of the terminals 13A, 13B.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a protection relay device for a power system, and is particularly suitable for a terminal block provided in the protection relay device.

  In a protection relay device used for protection control of a power system, a large current flows through the power system when an accident occurs in the power system to be protected and controlled. For this reason, the terminal block which can flow a big electric current is comprised in the part which takes in the input signal from the current transformer provided in the electric power system. A high breakdown voltage is required between input terminals of different terminal blocks.

  Further, the protection relay device is provided with an auxiliary transformer for converting the input signal level taken in via the terminal block into a signal level suitable for processing in the arithmetic processing unit.

  Japanese Patent Application Laid-Open No. 7-263053 discloses a method for mounting a terminal block on a printed circuit board. Specifically, the terminal block includes a hook and a lever for preventing the terminal block from being lifted from the printed circuit board during the soldering operation. The hook is formed at the lower end of the leg portion of the terminal, protrudes from the hole of the printed board, and is locked to the opening end of the hole by sliding in one direction of the terminal block placed on the printed board. The lever is formed integrally with the terminal block, and its lower end is fitted into a hole formed in the printed circuit board and pushes the terminal block in the one side direction by an elastic force.

JP-A-7-263053

  A problem in mounting the protective relay device is how to connect the primary winding of the auxiliary transformer and the terminal of the terminal block. Normally, considering that a large current flows through the primary winding, crimp terminals are attached to both ends of the covered electric wire used as the primary winding, and the crimp terminals are screwed to the terminal block. However, there is a problem that the manufacturing cost increases because the work is complicated.

  On the other hand, a method of connecting by printed wiring is also conceivable. However, in order to flow a large current, it is necessary to widen the wiring width and to increase the thickness of the copper foil for wiring, which is actually difficult.

  The present invention has been made in consideration of the above-mentioned problems, and an object thereof is to provide a terminal block capable of connecting the terminal block terminal and the primary winding of the auxiliary transformer by flow soldering. A protective relay device is provided.

  The present invention is a protective relay device, which includes a printed circuit board, an auxiliary transformer and a terminal block attached to the surface side of the printed circuit board. A covered wire is used as the primary winding of the auxiliary transformer. The terminal block includes an insulating member in which a first hole and a second hole reaching the printed board are formed, and a first terminal and a second terminal fixed to the insulating member. The end portions of the first and second terminals protrude through the first through hole and the second through hole provided in the printed board to the back side of the printed board. The printed board is provided with a third through hole and a fourth through hole that are continuous with the first and second holes, respectively. The first end of the covered electric wire is inserted into the first hole. The core wire on the first end side passes through the third through hole, protrudes to the back surface side of the printed circuit board, and is locked to a locking portion provided at the end of the first terminal. The second end of the covered electric wire is inserted into the second hole. The core wire on the second end side passes through the fourth through hole, protrudes to the back side of the printed circuit board, and is locked to a locking portion provided at the end of the second terminal.

  According to the present invention, the movement of the end portion of the covered wire used as the primary winding of the auxiliary transformer is regulated by the hole provided in the terminal block. Furthermore, the core wire on the end side of the covered electric wire is temporarily fixed by a locking portion provided at the end of the terminal. As a result, the primary winding of the auxiliary transformer and the terminal block can be connected using flow soldering.

It is a figure which shows typically the example of a connection structure of a protection relay apparatus. It is a block diagram which shows an example of the circuit structure of the protection relay apparatus of FIG. It is a top view which shows the example of mounting of the protection relay apparatus of FIG. FIG. 4 is a perspective view of the auxiliary transformer of FIG. 3. It is the top view which took out and showed the vicinity of the terminal block 12 of FIG. FIG. 6 is a cross-sectional view taken along a cutting line VI-VI in FIG. 5. It is sectional drawing which follows the cutting line VII-VII of FIG. FIG. 8 is a diagram illustrating the primary winding of the corresponding auxiliary transformer in addition to the cross-sectional view of FIG. 7. It is sectional drawing which cut | disconnected hole 33_1 of FIG. 5 and FIG. 8 by the surface parallel to a YZ plane. FIG. 6 is a cross-sectional view taken along a cutting line XX in FIG. 5. It is a top view which shows the shape of a part of back surface side of a printed circuit board.

  Hereinafter, each embodiment will be described in detail with reference to the drawings. The same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

<First Embodiment>
[Connection configuration of protection relay device]
FIG. 1 is a diagram schematically illustrating a connection configuration example of the protection relay device 10. The power line 1 is connected to a circuit breaker 2 and a transformer 3 (current transformer and / or voltage transformer). In FIG. 1, only one transformer 3 is representatively shown, but a current transformer and / or a voltage transformer is installed for each power line of each phase. The same applies to the circuit breaker 2.

  The current signal and / or voltage signal output from the transformer 3 is input to each terminal provided on the terminal block 25 on the back side of the protection relay device 10. An operation and display unit 60 of the protection relay device 10 is attached to the front side of the protection relay device 10.

[Circuit configuration of protection relay device]
FIG. 2 is a block diagram illustrating an example of a circuit configuration of the protection relay device of FIG. Referring to FIG. 2, protection relay device 10 includes an analog signal processing unit 80, an AD conversion and relay calculation unit 81, a digital input / output unit 82, and an operation and display unit 60.

  The analog signal processing unit 80 supports multiple channels (each channel corresponds to a current signal or voltage signal of any phase of the power system). In this specification, when distinguishing channels, an underscore (_) and a channel number are added to the end of the reference numerals.

  For each channel, the analog signal processing unit 80 includes a terminal 13 (13A, 13B) for connecting to the transformer 3 in FIG. 1, an auxiliary transformer 20 (also referred to as an input converter), and an analog filter (AF : Analog Filter) 17. One end of the primary winding 21 of the auxiliary transformer 20 is connected to the terminal 13A, and the other end is connected to the terminal 13B. A burden resistor 16 for converting a current signal into a voltage signal may be provided in parallel with the secondary winding 22 of the auxiliary transformer 20.

  The auxiliary transformer 20 performs AD conversion on the current signal or voltage signal from the transformer 3 and converts (steps down) the signal to a voltage level suitable for signal processing in the relay operation unit 81. The analog filter 17 is a low-pass filter or the like provided to remove aliasing errors during A / D conversion.

  The AD conversion and relay calculation unit 81 includes a sample hold circuit (S / H) 51, a multiplexer (MPX: Multiplexer) 52, and an analog / digital (A / D: Analog to Digital) converter 53. . The AD conversion and relay calculation unit 81 further includes a CPU (Central Processing Unit) 54, a RAM (Random Access Memory) 55, a ROM (Read Only Memory) 56, an interface circuit (I / F) 57, , And a bus 59 for connecting the above-described elements to each other.

  The sample hold circuit 51 is provided for each channel, and samples and holds the signal that has passed through the corresponding analog filter 17 at a predetermined sampling frequency. The multiplexer 52 sequentially selects the voltage signals held in the sample hold circuits 51_1, 51_2,. The A / D converter 53 converts the signal selected by the multiplexer into a digital value. The CPU 54 controls the overall operation of the protection relay device 10 and performs a relay calculation. The RAM 55 and ROM 56 are used as the main memory of the CPU 54. By using a non-volatile memory such as a flash memory, the ROM 56 can store programs and set values for the user to determine relay characteristics. The interface circuit 57 is used for operation and connection with the display unit 60.

  The digital input / output unit 82 includes a digital input (D / I) circuit 71 and a digital output (D / O) circuit 72. In FIG. 2, one digital input circuit 71 and one digital output circuit 72 are representatively shown, but a plurality of them may be provided. The digital input circuit 71 and the digital output circuit 72 are connected to the CPU 54 via the bus 59 and are connected to the outside via terminals 74 and 75. Thereby, the digital input circuit 71 and the digital output circuit 72 function as an interface circuit when the CPU 54 exchanges signals with the outside of the protection relay device 10. The digital output circuit 72 further outputs a trip signal for opening the circuit breaker 2 of FIG.

  The operation and display unit 60 includes operation keys for the user to input the setting of the protection relay device 10 and confirm the state of the protection relay device 10, and a liquid crystal panel for displaying the setting and the state. Including.

[Example of mounting a protective relay device]
(Overview and problems)
When mounting the components constituting the protection relay device 10 in FIG. 2, the components constituting the analog signal processing unit 80 are often fixed on the printed circuit board 40 by soldering. The terminals 13A and 13B of the analog signal processing unit 80 are fixed to the terminal block 25. Each component constituting the AD conversion and relay calculation unit 81 is fixed on the printed circuit board 50 by soldering. Each component constituting the digital input / output unit 82 is often fixed on the printed circuit board 70 by soldering. The terminals 74 and 75 of the digital input / output unit 82 are fixed to the terminal block 73. The printed circuit boards 40, 50, and 70 are attached to the inside of the housing 11.

  A problem in mounting the analog signal processing unit 80 is the connection between the primary winding 21 of the auxiliary transformer 20 and the terminals 13A and 13B. In particular, it is necessary to consider that a large current flows in the primary winding of the auxiliary transformer in the event of a power system failure. Conventionally, a crimp terminal is attached to both ends of a coated electric wire used as a primary winding, and the primary winding and the terminal block are connected by screwing the crimp terminal to the terminal block. However, such a connection method using a crimp terminal has a problem that the manufacturing cost increases because the work is complicated.

  On the other hand, the protection relay device of the first embodiment is characterized in that the primary winding 21 of the auxiliary transformer 20 and the terminals 13A and 13B of the terminal block 25 are connected by flow soldering. As a result, the manufacturing cost can be reduced as compared with the prior art. Here, flow soldering refers to a method of soldering a component to a printed circuit board by passing the part temporarily attached to the front surface side of the printed circuit board while immersing the back surface side of the printed circuit board in a soldering iron. .

  It should be noted that the signal line terminal 13 where a large current does not flow at the time of an accident and the primary winding 21 of the auxiliary transformer 20 may be connected using a printed wiring. Therefore, the covered electric wire and the printed wiring can be used in combination as the primary winding 21 of the auxiliary transformer 20.

(Details of connection method between terminal block and auxiliary transformer)
FIG. 3 is a plan view showing a mounting example of the protection relay device of FIG. In FIG. 3, the casing 11 and the printed circuit board 50 of the protection relay device are shown as a cross-sectional view. For ease of illustration, only the terminal block 25 and the auxiliary transformer 20 are shown, and other components and pattern wiring on the printed circuit boards 40 and 50 are not shown.

  The terminal block 25 shown as an example in FIG. 3 includes a portion (terminal block 12) attached to the printed circuit board 40 by soldering, a portion to which a signal from the transformer 3 in FIG. 1 is input (conversion connector 14), and It is comprised by two parts. The conversion connector 14 is for changing the shape of the terminal. Specifically, one end of the terminal provided in the conversion connector 14 has a shape in which the ends of the terminals 13A and 13B of the terminal block 12 can be inserted, and the other end is connected to the transformer 3 in FIG. The crimp terminal can be screwed. When the protection relay device 10 is used, the terminal block 12 and the conversion connector 14 are connected. Unlike FIG. 3, the terminal block 25 may be configured by integrally forming the terminal block 12 and the conversion connector 14.

  The terminal block 12 is attached along the edge portion 40E (one side of the rectangle) of the rectangular printed board 40. Auxiliary transformers 20_1 to 20_6 respectively corresponding to a plurality of channels (in the case of FIG. 3, 6 channels as an example) are provided in the central portion of the printed circuit board 40.

  The terminal block 12 includes an insulating member 30 made of resin, and terminals 13A_1 to 13A_6 and terminals 13B_1 to 13B_6 attached to the insulating member 30 (the terminals 13B_1 to 13B_6 overlap with the terminals 13A_1 to 13A_6). Not shown in FIG. 3). The insulating member 30 is formed with groove portions 31_1 to 31_6, first hole portions 32_1 to 32_6, and second hole portions 33_1 to 33_6 corresponding to the plurality of channels, respectively. When viewed from the direction perpendicular to the printed circuit board, the terminals 13A and 13B corresponding to the respective channels, and the groove portions 31 and the hole portions 32 and 33 corresponding to the respective channels are arranged along the edge 40E of the printed circuit board 40 (Y (Direction). The terminals 13A and 13B corresponding to the same channel, the groove 31 and the holes 32 and 33 are arranged adjacent to each other.

  The groove part 31 and the hole parts 32 and 33 are for guiding the covered electric wire used as the primary winding 21 of the corresponding auxiliary transformer 20 and restricting its movement. One end portion 26 </ b> A of the primary winding 21 of the auxiliary transformer 20 is inserted into the corresponding hole portion 32 through the corresponding groove portion 31. The other end portion 26 </ b> B of the primary winding 21 is inserted into the corresponding hole portion 33 through the corresponding groove portion 31.

  FIG. 4 is a perspective view of the auxiliary transformer of FIG. With reference to FIG. 3 and FIG. 4, a covered electric wire is used for the primary winding 21 in consideration of a large current flowing. This covered electric wire (primary winding 21) is wound around the iron core 23 by one turn or a plurality of turns. The secondary winding 22 is wound many times around the iron core 23, and its end (not shown) is connected to the printed wiring by soldering.

  FIG. 5 is a plan view showing the vicinity of the terminal block 12 of FIG. FIG. 5 does not show the primary winding 21 of FIG. 6 is a cross-sectional view taken along a cutting line VI-VI in FIG.

  With reference to FIGS. 5 and 6, in the case of the present embodiment, terminals 13A and 13B have a substantially L-shaped plate shape. The terminals 13A and 13B are fixed to an insulating member 30 attached to the surface 40F side of the printed circuit board 40.

  One end of the terminal 13A protrudes through the through hole 41 formed in the printed circuit board 40 toward the back surface 40R. A locking portion 15A for temporarily fixing a core wire 27A (see FIGS. 8 and 9) of a coated electric wire used as the primary winding 21 is formed at the end of the terminal 13A. Similarly, one end of the terminal 13B reaches the back surface 40R side through the through hole 42 formed in the printed circuit board 40. At the end portion of the terminal 13B, a locking portion 15B for temporarily fixing a core wire 27B (see FIGS. 8 and 9) of a covered electric wire used as the primary winding 21 is provided.

  In the example shown in FIG. 6, the locking portions 15A and 15B have a C-shaped claw shape, but can temporarily fix the core wire 27A of the covered electric wire such as an L-shaped claw shape or a hole shape. Any shape can be used. After the core wires 27A and 27B are locked to the locking portions 15A and 15B, the core wires 27A and 27B may be more securely fixed by deforming the locking portions 15A and 15B.

  FIG. 7 is a cross-sectional view taken along section line VII-VII in FIG. Referring to FIGS. 5 and 7, the insulating member 30 has a groove portion 31 corresponding to each channel, and a hole portion that penetrates the insulating member 30 so as to reach the surface 40F of the printed circuit board 40 from the bottom portion of the groove portion 31. 32 and 33 are formed. When viewed from the direction perpendicular to the printed circuit board 40, the hole 32 is formed at a position adjacent to the locking portion 15A of the corresponding terminal 13A, and the hole 33 is positioned at a position adjacent to the locking portion 15B of the corresponding terminal 13B. Is formed. In the case of FIG. 7, the cross-sectional shapes of the holes 32 and 33 are circular, but may be other shapes (for example, polygons).

  As shown in FIG. 7, portions 34 and 35 having smaller dimensions (diameters) in the vertical direction may be provided in part of the holes 32 and 33. Accordingly, the movement of the end portions 26A and 26B (see FIGS. 8 and 9) of the covered electric wire used as the primary winding can be more reliably regulated.

  Through holes 43 and 44 are formed in the printed circuit board 40 at positions that are continuous with the holes 32 and 33, respectively. The dimension (diameter) in the direction perpendicular to the through holes 43 and 44 is smaller than the dimension (diameter) in the direction perpendicular to the holes 32 and 33. Thus, only the core wires 27A and 27B (see FIGS. 8 and 9) of the covered electric wires can penetrate the printed circuit board 40 and reach the back surface 40R side of the printed circuit board 40.

  FIG. 8 is a view showing the auxiliary transformer 20 including the primary winding 21 in addition to the cross-sectional view of FIG. FIG. 9 is a cross-sectional view of the hole 33_1 shown in FIGS. 5 and 8 cut along a plane parallel to the YZ plane. FIG. 9 also shows a diagram including the primary winding 21 of the corresponding auxiliary transformer 20.

  With reference to FIGS. 8 and 9, one end portion 26 </ b> A of the covered electric wire used as the primary winding 21 for the auxiliary transformer 20 passes through the groove portion 31 formed in the insulating member 30 to the hole portion 32. Inserted. The core wire 27A on the end portion 26A side protrudes from the back surface 40R side of the printed circuit board 40 through the through hole 43 formed in the printed circuit board 40. The protruding portion of the core wire 27A is bent in a direction (approximately 90 degrees) along the back surface 40R and is locked to a locking portion 15A provided at the end of the corresponding terminal 13A.

  Similarly, the other end 26 </ b> B of the covered electric wire is inserted into the hole 33 through the groove 31 formed in the insulating member 30. The core wire 27B on the end portion 26B side protrudes from the back surface 40R side of the printed circuit board 40 through the through hole 44 formed in the printed circuit board 40. The protruding portion of the core wire 27B is bent in a direction (approximately 90 degrees) along the back surface 40R and is locked to a locking portion 15B provided at an end of the corresponding terminal 13B.

  As described above, the core wires 27A and 27B of the both ends 26A and 26B of the covered electric wire used with the primary winding 21 and the locking portions 15A and 15B provided at the end portions of the corresponding terminals 13A and 13B are surely provided. By temporarily fixing, a large number of primary windings 21 (in the case of FIG. 3, six primary windings 21) can be connected to the terminal block 12 at once using flow soldering.

  10 is a cross-sectional view taken along a cutting line XX in FIG. The terminals 13A_2 and 13B_2 shown in FIG. 10 basically have a substantially L-shaped plate shape, similarly to the terminals 13A_1 and 13B_1 shown in FIG. Further, similarly to the case of FIG. 6, locking portions 15A_2 and 15B_2 are formed at the ends of the terminals 13A_2 and 13B_2, respectively. However, the positions where the end portions of the terminals 13A_2 and 13B_2 penetrate the printed circuit board 40 (that is, the positions of the through holes 41_2 and 42_2) are different from those in FIG. Specifically, the end portions of the terminals 13A_2 and 13B_2 are arranged at positions farther from the edge portion 40E of the printed circuit board 40 than the end portions of the adjacent terminals 13A_1 and 13_1.

  In the terminal block 12 as a whole, as shown in FIG. 5 and the like, the ends of the terminals 13A_2, 13A_4, 13A_6 corresponding to the even-numbered channels are printed more than the ends of the terminals 13A_1, 13A_3, 13A_5 corresponding to the odd-numbered channels. The printed board 40 is penetrated at a position further away from the edge 40E of the board 40. When viewed from the direction perpendicular to the back surface 40R of the printed circuit board 40, the end portions (the locking portions 15A and 15B) of the terminals 13A and 13B are arranged in a staggered manner in the direction along the edge portion 40E of the printed circuit board 40. Yes.

  FIG. 11 is a plan view illustrating a partial shape of the printed circuit board 40 on the back surface 40R side. As shown in FIG. 11, through holes 41 to 44 are formed in the printed circuit board 40 for each channel. Core wires 27A and 27B at both ends of the covered electric wire used as the primary winding 21 of the auxiliary transformer 20 pass through the through holes 43 and 44, respectively. Engagement portions 15A and 15B at the ends of the terminals 13A and 13B pass through the through holes 41 and 42, respectively.

  The through holes 43 and 44 for the core wires 27A and 27B and the corresponding through holes 41 and 42 for the terminals 13A and 13B (that is, for the same channel) are provided adjacent to each other. The dimension between the terminals 13A and 13B of the adjacent channels is the minimum dimension necessary to ensure a withstand voltage based on the wire diameter. Further, the distance between the through holes 41 to 44 corresponding to the odd-numbered channels and the edge 40E of the printed circuit board 40 is the same as the distance between the through holes 41 to 44 corresponding to the even-numbered channels and the edge of the printed circuit board 40. It is different from the distance between 40E. In other words, the through holes 41 to 44 corresponding to the respective channels are arranged in a staggered manner in the direction along the edge 40 </ b> E of the printed circuit board 40 when viewed from the direction perpendicular to the printed circuit board 40.

  Moreover, as shown in FIG. 11, the land 45 of the through hole 41 and the land 45 of the corresponding through hole 43 are connected to each other by being integrally formed. Similarly, the land 46 of the through hole 42 and the land 46 of the corresponding through hole 43 are connected to each other by being integrally formed. Thus, in the flow soldering process, the locking portions 15A and 15B at the ends of the terminals 13A and 13B can be reliably connected to the core wires 27A and 27B of the corresponding covered wires by soldering.

[effect]
As described above, the protection relay device of the first embodiment is characterized by the structure of the terminal block 12. Specifically, holes 32 and 33 for guiding a covered electric wire used as the primary winding 21 and restricting the movement thereof are formed in the insulating member 30 and the end portions of the terminals 13A and 13B of the terminal block 12 Are provided with locking portions 15A and 15B for temporarily fixing the core wires 27A and 27B of the covered electric wire. As a result, both ends 26A and 26B of the covered electric wire used as the primary winding 21 of the auxiliary transformer 20 and the terminals 13A and 13B of the terminal block 12 can be connected by flow soldering. Since flow soldering can be used, there is no need to attach a crimp terminal to the end of the covered electric wire. For this reason, the manufacturing cost of a protection relay apparatus can be reduced. Furthermore, since the terminals are arranged in a staggered manner, the dimension between terminals between adjacent channels can be made the minimum dimension in order to ensure a withstand voltage based on the wire diameter.

<Second Embodiment>
In FIG. 2, a relatively large current may flow for a trip signal output to the outside from the digital output circuit 72 of the digital input / output unit 82 via the terminal 75. Therefore, the configuration of the printed circuit board 70 and the terminal block 73 to which each component of the digital input / output unit 82 is attached is configured similarly to the printed circuit board 40 and the terminal block 25 in the analog signal processing unit 80 described in the first embodiment. May be.

  Specifically, the digital output circuit 72 is connected to the terminal block 73 via a covered electric wire in order to output a trip signal of the circuit breaker 2. The terminal block 73 includes an insulating member in which a hole reaching the printed circuit board 70 is formed, and a terminal 75 fixed to the insulating member. An end portion of the terminal 75 passes through a first through hole provided in the printed circuit board 70 and protrudes to the back surface side of the printed circuit board 70. Furthermore, the printed circuit board 70 is provided with a second through hole that is continuous with the hole. The end of the covered electric wire is inserted into the hole. Further, the core wire on the end side of the covered electric wire passes through the second through hole, protrudes to the back surface side of the printed circuit board 70, and is locked to a locking portion provided on the end portion of the terminal 75.

  With the above configuration, the digital output circuit 72 and the terminal 75 of the terminal block 73 can be connected by flow soldering.

  It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Power line, 2 Circuit breaker, 3 Transformer, 5 Control panel, 10 Protection relay apparatus, 12, 25, 73 Terminal block, 13A, 13B, 74, 75 terminal, 15A, 15B Locking part, 20 Auxiliary transformer, 21 Primary winding, 22 Secondary winding, 23 Iron core, 26A, 26B End of covered wire (primary winding), 27A, 27B Core wire, 30 Insulating member, 31 Groove, 32, 33 Hole, 40, 50, 70 printed circuit board, 40E edge, 40F printed circuit board surface, 40R printed circuit board back surface, 41, 42, 43, 44 through hole, 45, 46 land, 71 digital input circuit, 72 digital output circuit, 80 analog signal processing Part, 81 AD conversion and relay operation part, 82 digital input / output part.

Claims (5)

A printed circuit board,
Auxiliary transformer and terminal block attached to the surface side of the printed circuit board,
A covered wire is used as the primary winding of the auxiliary transformer,
The terminal block is
An insulating member formed with a first hole and a second hole reaching the printed circuit board;
Including a first terminal and a second terminal fixed to the insulating member;
The end portions of the first and second terminals protrude through the first through hole and the second through hole provided in the printed board to the back side of the printed board,
The printed circuit board is provided with a third through hole and a fourth through hole that are continuous with the first and second holes, respectively.
A first end portion of the covered electric wire is inserted into the first hole portion, and a core wire on the first end portion side penetrates the third through hole and protrudes to a back surface side of the printed circuit board; Locked to a locking portion provided at the end of the first terminal,
A second end portion of the coated electric wire is inserted into the second hole portion, and a core wire on the second end portion side passes through the fourth through hole and protrudes to the back surface side of the printed circuit board; A protection relay device that is locked to a locking portion provided at the end of the second terminal.   2. The protection relay device according to claim 1, wherein a dimension in a direction perpendicular to each of the first and second holes is larger than a dimension in a direction perpendicular to each of the third and fourth through holes. The protection relay device receives a signal of a plurality of channels from a power system,
Each of the auxiliary transformer, the first and second terminals, the first and second holes, and the first to fourth through holes is provided for each channel.
The first and second terminals corresponding to each of the channels and the first and second holes corresponding to the respective channels when viewed from a direction perpendicular to the printed circuit board are edges of the printed circuit board. The first and second terminals and the first and second holes corresponding to the same channel, which are alternately arranged along the end, are arranged adjacent to each other. The protective relay device described.   The distance between the first through fourth through holes corresponding to the odd-numbered channels and the edge is determined by the distance between the first through fourth holes corresponding to the even-numbered channels and the edge. 4. The protection relay according to claim 3, wherein the first to fourth through holes corresponding to the respective channels are arranged in a staggered manner in a direction along the edge portion of the printed circuit board. apparatus. A printed circuit board,
An output circuit and a terminal block attached to the surface side of the printed circuit board;
The output circuit is connected to the terminal block via a covered electric wire to output a trip signal for a circuit breaker,
The terminal block is
An insulating member in which a hole reaching the printed circuit board is formed;
A terminal fixed to the insulating member,
The end of the terminal protrudes to the back side of the printed circuit board through a first through hole provided in the printed circuit board,
The printed circuit board is provided with a second through hole continuing to the hole,
The end portion of the covered electric wire is inserted into the hole, and the core wire on the end side of the covered electric wire passes through the second through hole and protrudes to the back surface side of the printed circuit board, and the terminal A protection relay device that is locked to a locking portion provided at an end.

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