JP2014033574A - Test terminal block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a test terminal block capable of preventing outage on the load side caused by malfunction of a breaker, by measuring voltage to ground of a pair of terminal parts of the test terminal block while performing insulation protection of the pair of terminal parts after completion of maintenance/inspection of a protective relay.SOLUTION: In normal time when a shorting plug 2 is connected between one end part 10a of a first terminal part 10 and one end part 11a of a second terminal part 11, a cover 3 is attached in the positive direction so that positional relation between electric connection parts 103a and 113a for electrically connecting to probes of a measurement device and first measurement through holes 30 formed on the cover 3 for inserting the probes of the measurement device are linearly symmetrical or point symmetrical. In voltage measurement time when the shorting plug 2 is detached from the position between the one end parts 10a and 11a, the cover 3 is attached in the inverse direction so that positions of the electric connection parts 103a and 113a fit positions of the first measurement through holes 30.

Description

  The present invention relates to a test terminal block that is attached to a protective relay device panel including a protective relay disposed on each phase of a bus, for example.

  In general, a protection control device C for the purpose of detecting an accident in an electrical system for power transmission and distribution includes, for example, a protection relay device panel B, a transformer 60, a current transformer 61, and a circuit breaker 62 as shown in FIG. ing. The electric power supplied to the supply side electric circuit (bus line) 63 is supplied from the connection point A to the load side device 65 via the load side electric circuit (power transmission line) 64. The load-side electric circuit 64 is provided with the circuit breaker 62 that is opened by a current flowing in a trip coil (hereinafter referred to as trip coil) 66 provided in the protective relay device panel B. Further, the supply-side electric circuit 63 is provided with the transformer 60 for measuring the voltage applied to the supply-side electric circuit 63, and the voltage data is protected through the AC input unit 67 of the protective relay device panel B. Input to the relay 68. The load-side circuit 64 is provided with the current transformer 61 for measuring the current flowing through the load-side circuit 64, and the current data is protected via the AC input unit 67 of the protective relay device panel B. Input to the relay 68.

  The protective relay device panel B is installed in the switchboard room. For example, as shown in FIG. 7, a plurality of protective relays (or instruments) 68,... Further, operation switches 70,... For operating the protective relays 68 (...) are disposed above the protective relays 68, ..., and a plurality of terminal block bodies 80, ... are provided below the protective relays 68. A test terminal block T is provided. Although not shown, the AC input unit 67 is provided inside.

  When there is an abnormality in the input current data or voltage data, the protective relay 68 is connected to the auxiliary contact 68a of the protective relay 68 and a test plug 81 to be described later, as shown in FIG. The circuit breaker 62 is caused by passing a current through a series circuit composed of a pair of terminal portions 801 and 801 of the terminal block T and a trip coil 66 connected to the pair of terminal portions 801 and 801 of the test terminal block T. Is opened, the load side electric circuit 64 is disconnected from the load side device 65 (power failure), and the load side device 65 is protected. An auxiliary switch 71 for preventing the trip coil 66 from being burned out is connected to the trip coil 66 in series.

  As shown in FIG. 8A, the test terminal block T includes a terminal block main body 80, a short-circuit plug 81 electrically connected between the terminal portions 801 and 801 of the terminal block main body 80, terminal portions 801 and 801, and And a cover 82 that covers the short-circuit plug 81.

  As shown in FIG. 8B, the terminal block main body 80 includes a pair of upper and lower terminal portions 801 and 801 made of conductive male screws, a pair of insulating mounting blocks 802 and 802, a fastening member 803, First and second protection members 804 and 805 are provided.

  The terminal portion 801 penetrates the upper and lower portions of the front plate (substrate) P in the horizontal direction, one end portion 8001a projects to the front side of the substrate P, and the other end portion projects to the back side of the substrate P (not shown). . The other end of one terminal 801 is connected to the protective relay 68, and the other end of the other terminal 801 is connected to the trip coil 66 (not shown).

  The mounting bases 802 and 802 are inserted from both ends of the terminal portions 801 and 801 so as to sandwich the substrate P, and are arranged on the front and back sides of the substrate P. And the mounting bases 802 and 802 arrange | positioned at the front and back of the board | substrate P are integrated by uneven | corrugated fitting, and support the terminal parts 801 and 801 horizontally.

  The fastening member 803 has a conductive female screw portion and an insulating protective portion fixed to the peripheral surface of the female screw portion. The female screw portion 803a is screwed into the terminal portion 801, contacts the locking portion 81a of the short-circuit plug 81, and electrically connects the terminal portions 801 and 801 and the short-circuit plug 81.

  The first protective member 804 is fixed to the surface side of the fastening member 803, that is, to one end 801a of the terminal portion 801, and insulates and protects the one end 801a.

  The second protective member 805 is fixed to the terminal portion 801 so as to be positioned between the fastening member 803 and the mounting base 802, and ensures an insulation distance between the substrate P and the locking portion 81 a of the short-circuit plug 81. .

  The first and second protection members 804 and 805 are smaller than the outer diameter of the fastening member 803 and are fixed to the terminal portion 801 so as to sandwich the fastening member 803. Accordingly, the peripheral edge portion of the protection portion of the fastening member 803 having a larger diameter than the first and second protection members 804 and 805 is positioned outside the locking portion 81a of the shorting plug 81, so that the shorting plug 81 is locked. Insulation protection is provided for the portion 81a.

  The short-circuit plug 81 includes locking portions 81a and 81a disposed at both ends thereof, and an annular knob portion 810 having insulating properties fixed to the center portion. And the latching recessed part 811 is formed in the upper latching | locking part 81a toward the center from the side edge part. On the other hand, a locking recess 811 is formed in the lower locking portion 81 a from the arcuate portion along the longitudinal direction of the short-circuit plug 81. Then, both locking portions 81 a and 81 a of the short-circuit plug 81 are locked to the terminal portion 801 between the fastening member 803 and the second protection member 805.

  Then, the short-circuit plug 81 is connected to the one end portions 801a and 801a of the terminal portions 801 and 801, whereby the terminal portions 801 and 801 are conductively connected, and the monitoring relay 68 enters a monitoring state. Further, when the protective relay 68 is maintained and inspected, the shorting plug 81 is removed from the one end portions 801a and 801a of the terminal portions 801 and 801 so that the circuit breaker 62 does not operate erroneously. 62 is electrically disconnected in the closed state (closed state).

  The cover 82 is made of a transparent synthetic resin material so that it can be confirmed that the short-circuit plug 81 is connected to the one end portions 801a and 801a of the terminal portions 801 and 801. The cover 82 is insulative and insulates and protects one end portions 801a and 801a of the terminal portions 801 and 801 protruding from the substrate P. The cover 82 includes an oblong front covering portion 820, annular covering portions 821, 821 formed along the peripheral edge of the front covering portion 820, and a rear opening having the same shape as the front covering portion 820. 822.

  The front covering portion 820 has a size that can cover the front surface of the terminal portion 801 and the front space between the terminal portions 801 and 801. The annular covering portion 821 is sized to cover the peripheral surface of the terminal portions 801 and 801 and the side space between the terminal portions 801 and 801. The back opening 822 is formed at a position facing the front cover 820 and is sized such that the terminal portions 801 and 801 can be inserted and removed.

  When the short-circuit plug 81 is normally connected between the terminal portions 801 and 801, as shown in FIG. 8A, the terminal portions 801 and 801 are insulated and protected by the cover 82, and an electric shock or the like is prevented. On the other hand, at the time of maintenance / inspection of the protective relay 68 and the like, the cover 82 is removed from the terminal portions 801 and 801 and the shorting plug 81 is removed from the terminal portions 801 and 801 as shown in FIG. 8B.

JP 2009-33816 A

  In the case of the test terminal block T of the above publication, when the maintenance / inspection of the protective relay 68 and the like is completed, the shorting plug 81 is connected between the terminal portions 801 and 801. When a voltage to ground is generated, a current flows through the trip coil 66, the breaker 62 is erroneously operated (open state), and the load-side electric circuit 64 may be cut off, resulting in a power failure.

  Therefore, in view of the above-mentioned problems, the present invention measures the voltage between the pair of terminal parts while grounding and protecting the pair of terminal parts of the test terminal block after the maintenance / inspection of the protective relay, etc. The purpose is to provide a test terminal block that can prevent a power outage on the load side due to a malfunction of the circuit breaker.

  The test terminal block according to the present invention includes a pair of conductive terminal portions fixed to the substrate such that one end portion protrudes, and one end portion of the pair of terminal portions screwed to the one end portion. A fastening member that electrically connects a shorting plug therebetween, a protective member that is fixed to the one end, and that insulates and protects the one end, and a cover that covers the one end, the shorting plug, the fastening member, and the protective member And at the time of voltage measurement in which the shorting plug is removed from between the one end portions, the one end portion and a probe of a measuring instrument for measuring a voltage across the ground at the one end portion are electrically connected directly or indirectly. While the electrical connection part for connection is provided, the first measurement through-hole into which the probe of the measuring instrument is inserted is formed in the cover, and the short-circuit plug is connected between the one end parts. Connection and first At the time of voltage measurement in which the cover is attached in the positive direction and the shorting plug is removed from between the one end portions so that the position with respect to the fixed through hole is in a line-symmetrical or point-symmetrical positional relationship, The cover is attached in the reverse direction so that the positional relationship with the first measurement through hole is the same.

  Further, as one aspect of the test terminal block according to the present invention, the electrical connection portion is a second portion formed on the protection member so that a part of the one end portion or a part of the fastening member is exposed. It is also possible to adopt a configuration that is a through hole for measurement.

  As another aspect of the test terminal block according to the present invention, one end of one terminal portion has a small outer diameter, and one end portion of the other terminal portion has a large outer diameter, while the shorting plug A locking recess having an inner diameter corresponding to the size of the outer diameter of each of the one end portions is formed at both ends of each of the first and second end portions. It is also possible to adopt a configuration in which the end is formed wide.

  Further, as another aspect of the test terminal block according to the present invention, when the cover is to be attached in the reverse direction in the normal state, the cover is arranged so as to come into contact with the other end of the large short-circuit plug. It is also possible to adopt a configuration in which convex portions are formed on the inner surface.

  As another aspect of the test terminal block according to the present invention, the second measurement through-hole is constituted by a female screw, and the probe of the measuring instrument is constituted by a male screw so as to be screwed into the female screw. It is preferable.

  According to the present invention, after completion of maintenance / inspection of the protective relay, before connecting the shorting plug to the pair of terminal portions, one end of the pair of terminal portions is insulated and protected by the cover. It is possible to measure the voltage to ground generated in the section, and to prevent a power failure on the load side due to a malfunction of the circuit breaker.

The side sectional view of the terminal block for a test concerning one embodiment of the present invention. A is a front view of a short-circuit plug, and B is a side view of FIG. 2A. A is a front view of a cover, B is a side view of FIG. 3A. It is a figure explaining the usage condition of the terminal block for a test of FIG. 1, A is a front view which shows the state which latches the both ends of a shorting plug in a pair of terminal part, B is a shorting plug in a pair of terminal part Is a front view showing a state in which the cover is attached in the forward direction and C is a front view showing a state in which the short plug is removed from the pair of terminal portions and the cover is attached in the reverse direction. A is a sectional side view showing a state in which a probe of a measuring instrument is inserted into a pair of terminal portions and voltage is measured, and B is a front view showing a knob fixed to the probe. The figure which shows a protection control apparatus and a protection relay apparatus panel. The front view which shows a protection relay apparatus panel. It is a perspective view which shows the conventional test terminal block, A is a figure which shows the state which attached the cover to a pair of terminal part, B is a shorting plug from a pair of terminal part while removing a cover from a pair of terminal part The figure which shows the state which removed.

  A test terminal block according to an embodiment of the present invention will be described with reference to FIGS. The test terminal block according to the present embodiment will be described by taking as an example one arranged on a switchboard such as the protective relay device panel B shown in FIG. Accordingly, in this case as well, as in the case of FIG. 6, the shorting plug is connected to the pair of terminal portions, whereby the pair of terminal portions are conductively connected to be in a monitoring state by the protective relay 68. Further, when the protective relay 68 is maintained and inspected, the short-circuit plug is removed from the pair of terminal portions so that the breaker 62 is electrically disconnected so that the breaker 62 does not operate erroneously. That is, electric power is supplied to the load-side electric circuit 64 with the circuit breaker 62 turned on.

  As shown in FIG. 1, the test terminal block T includes a terminal block body 1 attached to the front plate (substrate P) of the protective relay device panel B, and first and second terminal portions 10 and 11 described later. And a cover 3 that covers the terminal block body 1 and the shorting plug 2.

  As shown in FIG. 1, the terminal block main body 1 includes a first terminal portion 10 that penetrates the upper portion of the substrate P in the horizontal direction, a second terminal portion 11 that penetrates the lower portion of the substrate P in the horizontal direction, and a first terminal. Two mounting bases 101 and 111 for horizontally supporting the portion 10 and the second terminal portion 11, and one end portions 10a and 11a of the first terminal portion 10 and the second terminal portion 11 protruding to the front side of the substrate P are screwed. Fastening members 102 and 112 to be joined, and protective members 103 and 113 fixed to one end portions 10a and 11a of the first terminal portion 10 and the second terminal portion 11 are provided.

  And the other end part 10b of the 1st terminal part 10 which protrudes in the back side of the board | substrate P is connected to the circuit by the side of the protective relay 68 shown in FIG. 6, and the 2nd terminal part 11 protrudes in the back side of the board | substrate P. The other end 11b is connected to a trip coil 66 shown in FIG. 1 shows a state where the shorting plug 2 is connected between the mounting bases 101 and 111 and the fastening members 102 and 112 and the cover 3 is attached in the forward direction.

  The first terminal portion 10 is composed of a small-diameter male screw having conductivity, penetrates the substrate P in the horizontal direction, one end portion 10a projects to the front side of the substrate P, and the other end portion 10b projects to the back side of the substrate P. ing.

  The second terminal portion 11 is composed of a large-diameter male screw having conductivity, and, like the first terminal portion 10, penetrates the substrate P in the horizontal direction, and the one end portion 11a projects to the front side of the substrate P. The end 11b protrudes from the back side of the substrate P.

  The mounting bases 101a, 101b, 111a, 111b are respectively screwed into both end portions 10a, 10b and 11a, 11b of the first terminal portion 10 and the second terminal portion 11 so as to sandwich the substrate P, and are attached to the front and back sides of the substrate P. Has been placed. And the mounting bases 101a and 111a arrange | positioned at the front side of the board | substrate P are comprised by the annular | circular shaped internal thread, and it screw-fits to the one end parts 10a and 11a, and press-contacts the surface of the board | substrate P. On the other hand, the mounting bases 101b and 111b arranged on the back side of the substrate P are constituted by female screws, and contact portions 1010b and 1110b having larger diameters than the first and second mounting holes P1 and P2 formed in the substrate P. The first and second mounting holes P1 and P2 have insertion portions 1011b and 1111b that are slightly smaller in diameter than the first and second mounting holes P1 and P2. Then, the insertion portions 1011b and 1111b are inserted into the first and second attachment holes P1 and P2, and the contact portions 1010b and 1110b are in contact with the opening peripheral portions of the first and second attachment holes P1 and P2. The first terminal portion 10 and the second terminal portion 11 are horizontally supported by mounting bases 101a, 101b, 111a, 111b arranged on the front and back of the substrate P.

  The fastening members 102 and 112 have conductive female screw portions 102a and 112a and insulating protective portions 102b and 112b fixed to the peripheral surfaces of the female screw portions 102a and 112a. The female screw portions 102a and 112a are screwed into the one end portions 10a and 11a of the terminal portions 10 and 11, and come into contact with a locking portion of the shorting plug 2 described later, so that the first and second terminal portions 10 and 11 and the shorting plug are connected. 2 are electrically connected.

  The protection members 103 and 113 are fixed to the surface side of the fastening members 102 and 112, that is, the one end portions 10a and 11a of the first and second terminal portions 10 and 11, and the one end of the first and second terminal portions 10 and 11 The parts 10a and 11a are insulated and protected. Further, the protective members 103 and 113 are electrically connected so that part of the one end portions 10a and 11a of the first and second terminal portions 10 and 11 or the female screw portions 102a and 112a of the fastening members 102 and 112 are exposed. Second measurement through holes 103a and 113a as connection portions are formed along the axial direction of the one end portions 10a and 11a.

  As shown in FIGS. 2A and 2B, the short-circuit plug 2 is fixed to the upper locking portion 20 having a small width at the upper end, the lower locking portion 21 having a large width at the lower end, and the central portion. And an insulating knob 22 having an insulating property. And the upper latching | locking recessed part 200 for latching to the one end part 10a of the small diameter 1st terminal part 10 is formed in the upper latching | locking part 20 toward one side edge part from the other side. ing. In the lower locking portion 21, a lower locking recess 210 for locking to the one end portion 11 a of the large-diameter second terminal portion 11 is formed in the same direction as the upper locking recess 200. Moreover, the knob | pick part 22 is provided with the narrow part 22a and the wide part 22b. When the cover 3 is attached in the forward direction with the short-circuit plug 2 connected to the first and second terminal portions 10 and 11, as shown in FIGS. 1 and 4B, the third protrusion of the cover 3 is provided. The part 6 is positioned on both sides of the narrow part 22a of the knob 22 of the short-circuit plug 2, and the cover 3 can be attached and detached. On the other hand, when the cover 3 is to be attached in the reverse direction with the short-circuit plug 2 connected to the first and second terminal portions 10 and 11, as shown in FIG. 6 contacts the lower locking portion 21 of the short-circuit plug 2 so that the cover 3 is prevented from being attached in the reverse direction.

  The cover 3 is made of a transparent synthetic resin material so that it can be confirmed that the short-circuit plug 2 is connected to the one end portions 10 a and 11 a of the first and second terminal portions 10 and 11. And the cover 3 has insulation, and as shown in FIG. 1, the one end parts 10a and 11a of the 1st and 2nd terminal parts 10 and 11 which protrude from the board | substrate P are insulated and protected. As shown in FIGS. 3A and 3B, the cover 3 includes an oblong front covering portion 3a, an annular covering portion 3b formed along the peripheral edge of the front covering portion 3a, and a front covering portion 3a. And a back opening 3c having the same shape.

  The front covering portion 3a is sized to cover the front surfaces of the protective members 103 and 113 of the first and second terminal portions 10 and 11 and the front space between the protective members 103 and 113 (FIG. 1). reference). Further, the first covering through hole 30 is formed in the upper and lower portions of the front covering portion 3a. Moreover, the display board 35 is stuck by the center part to the front surface covering part 3a. On the display plate 35, an arrow indicating the mounting direction of the cover 3 is displayed. Then, as shown in FIG. 4B, when the direction of the arrow is upward, the cover 3 is attached in the forward direction, and as shown in FIG. 4C, when the arrow is downward, the cover 3 is attached in the reverse direction.

  When the cover 3 is attached in the forward direction, the first measurement through hole 30 of the cover 3 and the second measurement through holes 103a and 113a of the protection members 103 and 113 are as shown in FIG. 4B. In addition, when the cover 3 is attached in the opposite direction with respect to the center of the cover 3, as shown in FIG.

  The annular covering portion 3b includes upper and lower arc-shaped portions 30b and 30b covering the outer periphery of the one end portions 10a and 11a of the first and second terminal portions 10 and 11, and one end portion 10a of the first and second terminal portions 10 and 11. , 11a and left and right flat portions 31b, 31b covering the side space. Moreover, the 1st-3rd convex parts 4-6 are formed in the inner surface of the cyclic | annular coating | coated part 3b by the side of the back surface opening part 3c. The 1st convex part 4 is formed along the circular-arc-shaped part 30b above the cyclic | annular coating | coated part 3b (refer FIG. 3B). As shown in FIG. 1, the first convex portion 4 comes into contact with the mounting base 101 a of the first terminal portion 10 disposed on the front side of the substrate P when the cover 3 is attached in the forward direction. The 2nd convex part 5 is formed along the circular-arc-shaped part 30b of the lower side of the cyclic | annular coating | coated part 3b. Then, as shown in FIG. 5A, the second convex portion 5 comes into contact with the mounting base 101 a of the first terminal portion 10 disposed on the front side of the substrate P when the cover 3 is attached in the reverse direction. The 3rd convex part 6 is formed along the horizontal direction in the flat part 31b of the cyclic | annular coating | coated part 3b. And the 3rd convex part 6 is located in the both sides of the narrow part 22a of the knob | pick part 22 of the shorting plug 2, when the cover 3 is attached to a positive direction, as shown to FIG. 1 and FIG. 4B. On the other hand, when the cover 3 is to be attached in the reverse direction with the short-circuit plug 2 attached, the third convex portion 6 contacts the lower locking portion 21 having a large width of the short-circuit plug 2, and the cover 3 Is attached in the opposite direction (not shown).

  The back opening 3c is formed at a position facing the front cover 3a and is sized so that the one end portions 10a, 11a of the first and second terminal portions 10, 11 can be inserted and removed.

  Here, the configuration of the measuring instrument (voltmeter) 50 for measuring the ground voltage of the first and second terminal portions 10 and 11 will be briefly described with reference to FIG. 5A. The measuring instrument 50 includes a meter 51 disposed in the front center portion, a connection terminal 52 disposed in the upper front portion, and a probe 53. One end 53 a of the probe 53 is connected to the connection terminal 52 of the measuring instrument 50. On the other hand, the other end 53b of the probe 53 is formed of a male screw that is screwed into the second measurement through holes 103a and 113a. As shown in FIG. 5B, the other end 53b of the probe 53 is formed with three protruding pieces 53c,... At equal intervals so that the male screw can be easily tightened. The three protruding pieces 53c can be attached to and detached from the first and second terminal portions 10 and 11 by positioning the index finger, the middle finger and the thumb in three spaces adjacent to each other and operating the male screw. I have to.

  Next, a usage mode will be described with reference to FIGS. First, as shown in FIG. 4A, when the shorting plug 2 is normally connected to the first and second terminal portions 10 and 11 of the terminal block body 1, the first and second terminal portions 10 and 11 and the shorting plug 2 are connected. Are covered by a cover 3 attached in the positive direction (see FIG. 4B). In this case, the first measurement through hole 30 of the cover 3 and the second measurement through holes 103a and 113a as the electrical connection portions of the protection members 103 and 113 are in a line-symmetrical or point-symmetrical positional relationship. The voltage between the first and second terminal portions 10 and 11 cannot be measured.

  Next, at the time of voltage measurement when the shorting plug 2 is removed from the first and second terminal portions 10 and 11, the cover 3 is attached in the reverse direction as shown in FIG. 4C. In this case, the first measurement through hole 30 of the cover 3 and the second measurement through holes 103a and 103a of the protective members 103 and 113 are in a positional relationship, and the first and second terminal portions 10 and Eleven ground voltages can be measured.

  Then, as shown in FIG. 5A, the probe 53 of the measuring instrument 50 is inserted into the first measurement through hole 30 on the upper side of the cover 3 and the second measurement through hole 103a on the upper side of the protection member 103. The end surface of the one end portion 10 a of the first terminal portion 10 is brought into contact with the end surface of the probe 53. If it does so, the 1st terminal part 10 and the probe 53 will be electrically connected, and the voltage to ground of the 1st terminal part 10 can be measured. On the other hand, the probe 53 of the measuring instrument 50 is inserted into the first measurement through hole 30 on the lower side of the cover 3 and the second measurement through hole 113a on the lower side of the protection member 113, and the second terminal portion 11. The end surface of the one end portion 11a is brought into contact with the end surface of the probe 53. If it does so, the 2nd terminal part 11 and the probe 53 will be electrically connected, and the voltage to ground of the 2nd terminal part 11 can be measured. After confirming the voltage between the first and second terminal portions 10 and 11, the short-circuit plug 2 is connected to the first and second terminal portions 10 and 11 (see FIG. 4A).

  Further, when the cover 3 is to be attached in the reverse direction in the normal state, the third convex portion 6 formed on the inner surface of the cover 3 contacts the lower locking portion 21 of the wide short-circuit plug 2. As a result, it is possible to prevent the cover 3 from being attached in the reverse direction at the normal time. That is, the cover 3 is attached only in the positive direction in normal times.

  Accordingly, after the maintenance / inspection of the protective relay 68 shown in FIG. 6 is completed, before the short-circuit plug 2 is connected to the first and second terminal portions 10 and 11, the one end portions 10a of the first and second terminal portions 10 and 11 are used. , 11a with the cover 3 insulated and protected, the ground voltage generated at the one end 10a, 11a of the first and second terminal portions 10, 11 can be measured, and the circuit breaker 62 shown in FIG. A power failure on the load side can be prevented.

  As described above, the test terminal block T according to the present invention has a pair of conductive terminal portions 10 and 11 fixed to the substrate P and a pair of terminal portions 10 and 11 so that the one end portions 10a and 11a protrude. Are fastened to the one end portions 10a and 11a, respectively, and fastened to the one end portions 10a and 11a, respectively. A protective member 103, 113 for insulating and protecting the one end 10a, 11a; a cover 3 for covering the one end 10a, 11a, the shorting plug 2, the fastening member 102, 112, and the protective member 103, 113; A measuring instrument 50 that measures the voltage between the one end portions 10a and 11a and the one end portions 10a and 11a at the time of voltage measurement when the short-circuit plug 2 is removed from between 10a and 11a. Electric connection portions 103 a and 113 a for electrically connecting the probe 53 directly or indirectly are provided, while the first measurement through hole 30 through which the probe 53 of the measuring instrument 50 is inserted into the cover 3. In the normal state when the short-circuit plug 2 is connected between the one end portions 10a and 11a, the positions of the electrical connection portions 103a and 113a and the first measurement through holes 30 and 30 are axisymmetric or point-like. At the time of voltage measurement in which the cover 3 is attached in the positive direction and the shorting plug 2 is removed from between the one end portions 10a and 11a so as to have a symmetrical positional relationship, the electrical connection portions 103a and 113a and the first measurement are performed. The cover 3 is attached in the reverse direction so that the positions of the through holes 30 and 30 for use coincide with each other. Thereby, in the normal case where the short-circuit plug 2 is connected between the one end portions 10a, 11a of the pair of terminal portions 10a, 11a with the cover 3 attached in the positive direction, the first measurement through-hole 30, 30 and the electrical connection portions 103a and 113a are located at different positions. Therefore, the one end portions 10a and 11a, the short-circuit plug 2, and the fastening members 102 and 112 are covered by the cover 3, and the one end portions 10a and 11a The ground voltage cannot be measured.

  On the other hand, in the case of voltage measurement in which the cover 3 is attached in the opposite direction to the normal time and the shorting plug 2 is removed from between the one end portions 10a and 11a, the electrical connection portions 103a and 113a and the first measurement are performed. Since the positions of the through holes 30 and 30 for use coincide with each other, the one end portions 10a and 11a, the short-circuit plug 2, and the fastening members 102 and 112 are insulated and protected by the cover 3, and The voltage to ground can be measured. That is, the probe 53 of the measuring instrument 50 and the one end 10a, 11a are electrically connected directly or indirectly so that the voltage to ground of the one end 10a, 11a can be measured easily and safely. become.

  Further, according to the test terminal block T according to the present embodiment, the electrical connection portions 103a and 113a are configured such that a part of the one end portions 10a and 11a or a part of the fastening members 102 and 112 are exposed. This is a second through hole for measurement formed in the protective members 103 and 113. Thereby, when the cover 3 is attached in the forward direction, the first measurement through holes 30 and 30 of the cover 3 are different from the second measurement through holes 103a and 113a of the protection members 103 and 113. Because of the relationship (line symmetric or point symmetric positional relationship), the voltage between the one end portions 10a and 11a cannot be measured. On the other hand, when the cover 3 is attached in the reverse direction, the first measurement through holes 30 and 30 of the cover 3 and the second measurement through holes 103a and 113a of the protection members 103 and 113 communicate with each other. Since there is a relationship (a matching positional relationship), the probe 53 of the measuring instrument 50 is placed on a part of the one end portions 10a, 11a or a part of the fastening members 102, 112 exposed to the second measurement through holes 103a, 113a. Can be electrically connected. That is, the probe 53 of the measuring instrument 50 is directly or indirectly electrically connected to the one end portions 10a and 11a, thereby easily and safely measuring the ground voltage of the one end portions 10a and 11a. Will be able to.

  Further, according to the test terminal block T according to the present embodiment, one end portion 10a of one terminal portion 10 has a small outer diameter, and one end portion 11a of the other terminal portion 11 has a large outer diameter. On the other hand, locking recesses 200 and 210 having inner diameters corresponding to the outer diameters of the one end portions 10a and 11a are formed at both ends of the short-circuit plug 2, respectively. One end is formed with a small width and the other end is formed with a large width. Accordingly, the direction of the short-circuit plug 2 connected to the pair of terminal portions 10 and 11 is determined as one direction, and when the short-circuit plug 2 is connected to the pair of terminal portions 10 and 11, the short-circuit plug 2 is connected. The position of one end portion with a small width of 2 and the other end portion with a large width are determined.

  Further, according to the test terminal block T according to the present embodiment, when the cover 3 is to be attached in the reverse direction, the test terminal block T is in contact with the other end of the wide short-circuit plug 2. The convex portion 6 is formed on the inner surface of the cover 3. Thereby, attachment of the cover 3 in the reverse direction at the normal time can be prevented. That is, the cover 3 is attached only in the positive direction in normal times.

  Further, according to the test terminal block T according to the present embodiment, the second measurement through holes 103a and 113a are constituted by female screws, while the probe 53 of the measuring instrument 50 is screwed into the female screw. Is composed of male threads. Accordingly, since the electrical connection between the probe 53 of the measuring instrument 50 and the pair of terminal portions 10 and 11 is made by screwing the male screw and the female screw, contact failure can be prevented, and the pair of terminal portions can be prevented. The voltage between the grounds of 10 and 11 can be reliably measured.

  Further, the test terminal block T according to the present invention can be variously modified without being limited to the embodiment.

  For example, in the above embodiment, the measurement through holes 103a and 113a formed in the protection members 103 and 113 are used as the electrical connection portions, but the first and second terminal portions 10 and 11 are used as the electrical connection portions. The fastening members 102 and 112 to be screwed together may be used, or the one end portions 10a and 11a of the first and second terminal portions 10 and 11 may be used. In short, any configuration may be used as long as it can be indirectly or directly electrically connected to the terminal portions 10 and 11.

  In the embodiment, the measurement through holes 103a and 113a formed in the protection members 103 and 113 are simply holes through which the probe 53 of the measuring instrument 50 is inserted. You may make it provide the internal thread which has electroconductivity. In this case, it is necessary to form the probe 53 on the external thread so as to be engaged with the internal thread of the measurement through holes 103a and 113a. By doing so, the 1st and 2nd terminal parts 10 and 11 and the probe 53 come to be electrically connected reliably.

  In the case of the embodiment, the second measurement through holes 103a and 113a as the electrical connection portions are formed at eccentric positions with respect to the protection members 103 and 113, but may be formed at the center position. However, it is necessary to change the position of the first measurement through holes 30 and 30 and the size of the cover 3 in accordance with the positions of the second measurement through holes 103a and 113a.

  Moreover, in the case of the said embodiment, although demonstrated taking the case where the 1st and 2nd terminal parts 10 and 11 arrange | positioned at the protective relay apparatus board B were electrically connected as an example, of the terminal block arrange | positioned at a control board The present invention can also be applied when measuring the voltage between the pair of terminal portions.

DESCRIPTION OF SYMBOLS 1 ... Terminal block main body, 2 ... Short-circuit plug, 3 ... Cover, 6 ... Convex part, 10, 11 ... Terminal part, 10a, 11a ... One end part, 102, 112 ... Fastening member, 103, 113 ... Protection member, 103a, 113a: Electrical connection portion (second measurement through hole) 20, 21: Locking portion, 30: First measurement through hole, 50: Measuring instrument, 53: Probe, P: Substrate, T: For test Terminal block

Claims (5)

A pair of conductive terminal portions fixed to the substrate such that one end portion protrudes;
A fastening member that is screwed into one end of each of the pair of terminal portions and electrically connects a shorting plug between the one end portions;
A protective member fixed to each of the one end portions to insulate and protect the one end portion;
A cover that covers the one end, the shorting plug, the fastening member, and the protective member;
For measuring the voltage when the shorting plug is removed from between the one end portions, for directly or indirectly electrically connecting the one end portion and a probe of a measuring instrument for measuring a voltage between the one end portions to the ground. While the electrical connection portion is provided, a first measurement through-hole through which the probe of the measuring instrument is inserted is formed in the cover,
Further, when the short-circuit plug is connected between the one end portions, the cover is attached in the positive direction so that the electrical connection portion and the first measurement through hole are in a line-symmetrical or point-symmetrical positional relationship. The cover is attached in the opposite direction so that the electrical connection portion and the first measurement through hole are in the same positional relationship at the time of voltage measurement with the shorting plug removed from between the one end portions. A test terminal block characterized by that.   The said electrical connection part is a 2nd through-hole for a measurement formed in the said protection member so that a part of said one end part or a part of said fastening member may be exposed. Test terminal block as described.   One end portion of one terminal portion has a small outer diameter, and one end portion of the other terminal portion has a large outer diameter, while both ends of the short-circuit plug have an outer diameter of each of the one end portions. A locking recess having an inner diameter corresponding to the size is formed, and one end of the short-circuit plug is formed with a small width, and the other end is formed with a large width. Item 3. A test terminal block according to item 1 or 2.   In the normal state, when the cover is to be attached in the reverse direction, a convex portion is formed on the inner surface of the cover so as to abut against the other end of the large short-circuit plug. 3. The test terminal block according to 3.   5. The probe according to claim 2, wherein the second measurement through hole is formed of a female screw, and the probe of the measuring instrument is formed of a male screw so as to be screwed into the female screw. The test terminal block described in 1.

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