JP2012065413A - Input conversion unit of digital protection controller and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and efficiently mount a plurality of input transformers for measuring a quantity of electricity of an electric power system.SOLUTION: The unit comprises an electronic circuit substrate, on one end of the surface of which a terminal board is arranged, on the other end of the surface of which a connector is arranged, and on which a plurality of input transformer fixing components for mounting input transformers are arranged on a surface between one end and the other end; and a reinforcing metal fitting mounted on a rear face of the electronic circuit substrate for supporting the electronic circuit substrate. The input transformer fixing component is provided with a conducting terminal penetrating from a top surface to a rear surface of the electronic circuit substrate, and a lock portion for fixing the input transformer. The electronic circuit substrate is soldered on the rear surface, and the conducting terminal of each input transformer and the electric circuit between the terminal board and the connector are mounted in an insulating material of the electronic circuit substrate. Each input transformer with a leading wire is connected to the conducting terminal of the input transformer fixing component mounted to the surface of the electronic circuit substrate, and fixed and mounted using the lock portion of the input transformer fixing component.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input conversion unit of a digital protection control device and a manufacturing method thereof, and more particularly, to an input conversion unit of a digital protection control device capable of efficiently mounting a plurality of input transformers for measuring the amount of electricity in a power system And its manufacturing method.

  In a digital protection control device used for protection control of an electric power system, an input conversion unit for taking in an output from an input transformer that measures an electric quantity such as a voltage or current of the electric power system, and an electric power by executing a protection control calculation. The control unit that performs protection control of the system is configured as a separate unit as exemplified in Patent Document 1.

  These input conversion units and control units are housed in the same protection control panel, but the control unit is made of a plurality of input transformers that are high-voltage components, whereas the control unit is electronic and relatively small. The input conversion unit thus occupies a large installation capacity in the protection control panel. Furthermore, because the input transformer is large and heavy, and it is a specification that requires a plurality of mountings, the performance and productivity are poor, such as large size, large mass, and many wirings, which causes an increase in the cost of the entire product.

JP-A-8-163766

  The input converter of the digital protection control device converts the level of the signal and current detected by the current transformer and voltage transformer, etc. of the transmission line to be protected by the input transformer, or insulates the signal. This is the part to capture.

  The input conversion unit for one signal is as shown in FIG. 2 in terms of electrical circuit, and is connected to the terminal block T connected to the current transformer and voltage transformer side, and to the control unit side of the protective relay device. A circuit portion between the connector C and the connector C is formed on the electronic circuit board P, and a case ground E is provided. On the electronic circuit board P, appropriate electrical circuit wiring M is provided, and circuit components such as a resistor R are installed. However, the input transformer IT is manufactured separately from the electronic circuit board P, and is connected between the primary terminal S1 and the secondary terminal S2 of the electronic circuit board P.

  As described above, the input conversion unit for one signal has a simple configuration in terms of an electric circuit, but actually, it is composed of a plurality of types of current transformers and voltage transformers, and for each phase or between each line. To capture the signal. For this reason, the input conversion unit needs to have a plurality of circuit configurations shown in FIG. For example, a standard digital protective relay device constitutes an input conversion unit in units of 16 signals.

  Since the input conversion unit is as described above, in the conventional input conversion unit, since the input transformer IT is large and heavy, it is necessary to make the mounting unit strong and use a metal box or plate. There was a need. For this reason, the connection of the circuit is poor in workability because it is necessary to manually solder the lead wire of the input transformer IT to the primary terminal S1 and the secondary terminal S2 of the electronic circuit board P. Also, manual work for attaching the input transformer to the input conversion unit is necessary, and workability is poor.

  In addition, the conventional input conversion unit uses a toroidal core with low leakage flux for the purpose of high-density mounting, and the inductive influence from other large current wiring is set to “0” by design. In some cases, an influence value is generated, and the influence on the error may not be allowed depending on the variation of the parts.

  In view of the above, an object of the present invention is to provide an input conversion unit of a digital protection control device capable of simply and efficiently mounting a plurality of input transformers for measuring the amount of electricity in a power system, and a method for manufacturing the same. And

In order to achieve the above object, the input conversion unit of the digital protection control device of the present invention receives a plurality of electric quantity signals from the power system at the terminal block and passes the plurality of signals level-converted by the input transformer to the connector. Equipped with a circuit,
An electronic circuit board in which a terminal block is arranged at one end of the surface, a connector is arranged at the other end of the surface, and a plurality of input transformer fixing parts are arranged on the surface between the one end and the other end. And a reinforcing bracket attached to the back surface of the electronic circuit board to support the electronic circuit board, and the input transformer fixing component includes a conductive terminal and an input transformer installed penetrating from the front surface to the back surface of the electronic circuit board. And a locking portion for fixing
The electronic circuit board is soldered on the back surface, and an electric circuit between the conductive terminal of each input transformer and the terminal block and the connector is mounted in the insulating material of the electronic circuit board,
Each input transformer having a lead wire is connected to a conductive terminal of an input transformer fixing part attached to the surface of the electronic circuit board, and is fixed and attached using a locking portion of the input transformer fixing part.

  Also, the digital protection control device is installed in the protection control panel, and when the input conversion unit is mounted and fixed to the rack of the protection control panel, a terminal block is placed on the back side and a high voltage and Perform wiring on the current circuit side, place a connector on the front side of the protection control panel, and perform low voltage, low current side wiring on the front door side of the protection control panel.

In order to achieve the above object, a method for manufacturing an input conversion unit of a digital protection control device according to the present invention receives a plurality of electric quantity signals from a power system at a terminal block and passes a plurality of signals level-converted by an input transformer to a connector. Equipped with an electrical circuit for
Place the terminal block on one end of the surface of the electronic circuit board that mounts the electrical circuit wiring from the terminal block to the connector in the insulating material, place the connector on the other end of the surface,
Attach a reinforcing bracket to support the electronic circuit board to the back of the electronic circuit board,
Conductive terminals installed from the surface of the electronic circuit board to the back of the reinforcing metal fitting, and an input transformer fixing component having a locking portion for fixing the input transformer on the surface, one end and the other of the electronic circuit board Place multiple on the surface between the ends,
Solder the electronic circuit board on the back side,
Fix the input transformer with lead wire using the latching part of the input transformer fixing parts,
The lead wire of the input transformer is connected to the conductive terminal of the input transformer fixing part attached to the surface of the electronic circuit board.

  A plurality of input transformers that measure the amount of electricity in the power system can be easily and efficiently mounted.

The figure which shows the state by which all the input transformers were accommodated. The figure which shows the electric circuit structure of the input conversion part about one signal. The figure which shows an example of the reinforcement metal fitting of an input conversion unit. The figure which shows the state which attached the electronic circuit board to the reinforcement metal fitting. The figure which shows the input transformer fixing components installed in an input transformer attachment part. The figure which shows the state which attached the fixing component to the electronic circuit board. The figure which shows the condition which attached the input transformer to the stationary component.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The input conversion unit of the digital protection control apparatus of the present invention will be sequentially illustrated and described according to the assembly procedure.

  Conventionally, in order to support the weight of the input transformer IT, a metal box or plate is used to strengthen the unit to be mounted. However, in the present invention, the weight is supported by the reinforcing metal fitting 1 of FIG. The left side of FIG. 3 is a plan view of the reinforcing bracket 1, and the right side of FIG. 3 is a side view of the reinforcing bracket 1, and 11 is a fixing for attaching and fixing the finally assembled input conversion unit to the rack of the protection control panel. It is a metal fitting. 3 is a so-called frame, and spaces 12 and 13 are formed by the frame.

  FIG. 4 shows a state in which the electronic circuit board P is attached to the reinforcing metal fitting 1 of FIG. The left side of FIG. 4 is a plan view and the right side of FIG. 4 is a side view. The electronic circuit board P of FIG. 4 can mount the unit electric circuit of FIG. 2 for 16 signals, and is fixed to the frame portion position of the reinforcing bracket 1 of FIG.

  The electronic circuit board P mounts 16 terminal blocks T and three primary circuit side resistors R per signal in a portion corresponding to the space 13 in FIG. Further, the electronic circuit board P has 16 input transformer IT mounting portions 21a formed in a portion corresponding to the space 12 in FIG. Each of the insulating input transformer IT mounting portions 21a is provided with two through holes 22a, for example, two on the right side and three on the left side. Further, the electronic circuit board P of FIG. 4 includes the connector C of the circuit of FIG. 2 on the left side.

  As is clear from this arrangement, in the state of being attached and fixed to the rack of the protection control panel, the terminal block T connected to the current transformer and the voltage transformer side is arranged on the back side, so the back side of the protection control panel Therefore, high voltage and high current circuit side wiring is performed. Further, since the connector C connected to the control unit side of the protective relay device is arranged on the front side of the protection control panel, low voltage and low current side wiring is performed on the front door side of the protection control panel.

  In the present invention, the wiring between the input transformer IT and the electronic circuit board P is made into a mode on the electronic circuit board P, and the wiring work between the input transformer IT and the electronic circuit board P is eliminated. That is, the electric circuit wiring from the terminal block T of FIG. 2 to the primary terminal S1 through the resistor R and the electric circuit wiring from the secondary terminal S2 to the connector C through the resistor are electronic circuits from the beginning. Only the portion of the insulating material of the substrate P that is connected by a conductor and necessary for connection to an external device such as a resistor is separately soldered on the back surface of the electronic circuit substrate P and connected.

  FIG. 5 shows the input transformer IT fixing parts 21b installed in each of the 16 input transformer IT mounting portions 21a. The fixed component 21b made of an insulating material includes two conductive terminals 22b on the right side and three conductive terminals 22b on the left side. The conductive terminals 22b correspond to the through holes 22a of the input transformer IT mounting portions 21a in FIG. It is arranged at the position to do. And the conductive terminal 22b is penetrated by the through-hole 22a of the attaching part 21a, and is comprised integrally by being soldered and connected by the electronic circuit board P back surface.

  The fixed component 21b made of an insulating material accommodates the input transformer IT made of a toroidal core, has two sets of inclined portions 21b1 that match the toroidal shape of the input transformer IT, and has an inclined portion. A hooking portion 21b2 for fixing the input transformer IT is provided on the back surface of 21b1. In addition, since the electrical connection of the input transformer IT is a high-voltage and large current, for example, a wrapping connection is made between the lead wire of the input transformer IT and the conductive terminal 22b using a large-current cable that has been proven in the past.

  Connection between the lead wire of the input transformer IT and the conductive terminal 22b, the conductive terminal 22b penetrating through the through hole 22a of the mounting portion 21a, soldered and connected on the back surface of the electronic circuit board P, and the input transformer As is clear from the fact that the wiring between the IT and the electronic circuit board P is made into a mode, the conductive terminal 22b means the primary terminal S1 or the secondary terminal S2. Therefore, by connecting the lead wire of the input transformer IT and the conductive terminal 22b, the circuit of FIG. 2 is formed in terms of electrical circuit.

  FIG. 6 shows a state in which the fixing component 21b is attached to the electronic circuit board P of FIG. The left side of FIG. 6 is a plan view and the right side of FIG. 6 is a side view. The state of attachment of the fixed component 21b appears in that the inclined portion 21b1 is visible in the plan view.

  FIG. 7 is a diagram showing a situation in which the input transformer IT is attached to the fixed component 21b. According to the upper right side view, the toroidal core-shaped input transformer is formed in the circular space formed by the inclined portion 21b1 of the fixed component 21b. It can be seen that IT is housed and the band 31 fixes the hole in the center of the core and the hook portion 21b2 on the back of the inclined portion 21b1. According to the top view in the upper left of FIG. 7, the lead wire 32 extends toward the conductive terminal 22b. According to the front view at the bottom of FIG. 7, it can be seen that the lead wire 32 is connected to the conductive terminal 22b and the band 31 is fixed by the hook portion 21b2.

  FIG. 1 shows a state in which all input transformers IT are finally accommodated. The left side of FIG. 1 is a plan view and the right side of FIG. 1 is a side view. It can be seen from the plan view that the input transformer IT is attached to the fixed component 21b with the band 31 and the lead wire 32 of the input transformer IT is connected to the conductive terminal 22b.

  The input conversion unit of the digital protection control apparatus of the present invention is finally configured as shown in FIG. 1 and assembled in the order of FIGS. 3, 4, 6, and 1. FIG. In manufacturing in this way, each part part and the device on the assembly method will be described below.

  First, in FIG. 3, a lightweight reinforcing metal fitting is attached so that the electronic circuit board P is not damaged by the mass of the input transformer IT.

  In the connection of each part in Fig. 4, the wiring between the input transformer IT and the electronic circuit board P is made into a mode, thereby ensuring a certain quality by eliminating variations in the construction of each designer / manufacturer. did. That is, the electric circuit wiring is laid in advance in the electronic circuit board P. The wiring mode at this time is assumed to be in any circuit mounting state, and is a wiring mode that can satisfy all voltage / voltage conversion circuits (VT circuits) and all current / current conversion circuits (CT circuits).

  In FIG. 5, a dedicated fixing component 21b for the input transformer IT is used. By mounting the dedicated fixing component 21b directly on the electronic circuit board P, mounting by an automatic solder flow apparatus is possible, and the conventional manual mounting work is reduced. The dedicated fixing component 21b for the input transformer has the following characteristics.

  The toroidal core (input transformer IT) attached to the dedicated fixing component 21b has several sizes. For this reason, the size itself is adjusted to the maximum diameter toroidal core so that it can be applied to different types of toroidal cores, and the fixing method uses a conventional binding band to satisfy the quality.

  A conductive terminal 22b is provided in advance in the dedicated fixing component 21b. By attaching the lead wire 32 of the toroidal core (input transformer IT) to the conductive terminal 22b in advance, the input transformer IT can be attached to the electronic circuit board P and can be mounted by an automatic solder flow apparatus. .

  The input transformer IT includes a voltage / voltage conversion circuit (VT circuit) and a current / current conversion circuit (CT circuit), which are arranged adjacent to each other vertically and horizontally as shown in FIG. When a toroidal core with little leakage magnetic flux is used in such an adjacent arrangement, when a large current is input to the input transformer, an induced magnetic flux is generated in the toroidal core due to the magnetic field generated by the large current cable. To do. This induction may cause a non-negligible induction effect on the accuracy depending on the variation of parts, and this point should be improved as follows.

  The positional relationship between the VT circuit and the CT circuit is clarified so that the large current cable of the CT circuit does not pass near the VT circuit. When the CT circuit passes near the VT circuit, the influence is reduced by installing a magnetic shield. The degree of inductive influence for each VT circuit toroidal core is confirmed, and a high-current cable of the CT circuit is fixed to a point having the least inductive influence.

  According to the present invention, the input conversion unit can be easily and efficiently manufactured, and thus can be widely applied to protective relay devices.

T: Terminal block C: Connector P: Electronic circuit board E: Case ground M: Electrical circuit wiring R: Resistance IT: Input transformer S1: Primary terminal S2: Secondary terminal 1: Reinforcing bracket 11: Fixing bracket 12, 13: Space 20: Screw 21a: Input transformer mounting part 22a: Through hole 21b: Input transformer fixing part 22b: Conductive terminal 21b1: Inclined part 21b2: Hook part 31: Band 32: Lead wire

Claims (3)

In an input conversion unit of a digital protection control device equipped with an electric circuit for receiving a plurality of electric quantity signals from a power system at a terminal block and passing a plurality of signals level-converted by an input transformer to a connector,
The terminal block is arranged at one end of the surface, the connector is arranged at the other end of the surface, and a plurality of input transformer fixing parts for attaching the input transformer to the surface between the one end and the other end are arranged An electronic circuit board, and a reinforcing bracket attached to the back of the electronic circuit board to support the electronic circuit board,
The input transformer fixing component includes a conductive terminal installed penetrating from the front surface to the back surface of the electronic circuit board and a locking portion for fixing the input transformer,
The electronic circuit board is soldered on the back surface, and an electric circuit between the conductive terminal of each input transformer and the terminal block and the connector is mounted in an insulating material of the electronic circuit board,
Each input transformer having a lead wire is connected to a conductive terminal of the input transformer fixing part attached to the surface of the electronic circuit board, and is fixed and attached using a locking portion of the input transformer fixing part. An input conversion unit for a digital protection control device. In the input conversion unit of the digital protection control device according to claim 1,
The digital protection control device is installed in the protection control panel, and when the input conversion unit is mounted and fixed to the rack of the protection control panel, a terminal block is placed on the back side, and a high-voltage, high-current circuit is installed on the back side of the protection control panel. An input conversion unit for a digital protection control device, characterized in that wiring is performed on the front side of the protection control panel and a low voltage, low current wiring is performed on the front door side of the protection control panel. In a method for manufacturing an input conversion unit of a digital protection control device equipped with an electric circuit for receiving a plurality of electric quantity signals from a power system at a terminal block and passing a plurality of signals level-converted by an input transformer to a connector,
Place the terminal block on one end of the surface of the electronic circuit board that mounts the electrical circuit wiring from the terminal block to the connector in the insulating material, arrange the connector on the other end of the surface,
A reinforcing bracket for supporting the electronic circuit board is attached to the back surface of the electronic circuit board,
Conductive terminals installed through the back surface of the reinforcing metal fitting from the surface of the electronic circuit board and an input transformer fixing component having a locking portion for fixing the input transformer on the surface of the electronic circuit board. A plurality of surfaces disposed between the one end and the other end;
Soldering the electronic circuit board on the back surface;
Fixing the input transformer with a lead wire using the locking portion of the input transformer fixing part;
A method of manufacturing an input conversion unit of a digital protection control device, wherein a lead wire of the input transformer is connected to a conductive terminal of the input transformer fixing component attached to the surface of the electronic circuit board.

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