JP5253214B2 - Test terminal, trip coil control method using the same, and apparatus having the test terminal - Google Patents

Description

  The present invention relates to a test terminal used for a test or replacement of a protective relay, and in particular, a test terminal that can prevent a circuit breaker from being erroneously shut down due to an erroneous insertion of a test plug or a switch operation error. The present invention relates to a trip coil control method and a device including a test terminal.

The high-voltage and high-power circuit currents in the transmission system are connected to a protective relay, an instrument, and the like through a current transformer (CT), and the high-voltage and extra-high-voltage voltages are connected to an instrument transformer (PT). When a protective relay or the like detects a failure of a line or equipment, it sends a trip signal to the circuit breaker to operate the circuit breaker, disconnects the failure section from the system, and minimizes its influence. A test terminal (test terminal) is disposed between the current transformer or the like and the protective relay or the like so that the test or replacement of the protective relay or the like can be performed while keeping the line in a live line state. The test terminal plays a role of electrically disconnecting a protective relay or the like from a power source side such as a current transformer by inserting a test plug.

Generally, before inserting a test plug into a test terminal, protection relays, etc. are protected to prevent an electrical change (element shortage) caused by inserting the test plug from being a failure and sending a trip signal to the circuit breaker. Trip circuits such as relays are locked. Therefore, for example, Japanese Patent Application Laid-Open No. 2007-147372 “Test Terminal” of Patent Document 1 has been proposed.
Patent Document 1 describes one that prevents malfunction of the ground fault relay by making the length of the movable contact of the neutral phase of the test terminal shorter than the length of the movable contact of each of the other phases. .
JP 2007-147372 A

  As described above, when a protection relay or instrument is tested or replaced, a test plug is inserted after a trip circuit such as the protection relay is locked so that a trip signal is not output to the circuit breaker. However, it may forget to lock the trip circuit in a complicated work process. Therefore, when a current or voltage outside the set value is input for a specified time or longer due to the insertion of the test plug, the protective relay etc. sends a signal to the trip circuit, forms a trip circuit, operates the circuit breaker, and the electrical equipment Had a problem of power failure.

  Further, in the work process, after the test of the protective relay or the like is completed, the test plug is removed and then the trip circuit is unlocked. Furthermore, even if the test plug is pulled out due to a malfunction of the movable contact plate of the test terminal, the distance between the movable contact plate of the power supply side conductor and the movable contact plate of the load side conductor does not return and the contact portion remains separated. Sometimes the trip circuit is unlocked without realizing it. In such a case as well, the protective relay or the like sends a signal to the trip circuit and operates the circuit breaker, which may cause an unintended power failure.

  The present invention has been developed to solve the above-described problems. In other words, the object of the present invention is to prevent trip circuits from being formed due to human error and malfunction of the movable contact plate that occur during testing and replacement of protective relays and instruments, and to prevent erroneous circuit breakers from breaking. It is an object of the present invention to provide a test terminal that enables the control, a method of controlling a trip coil using the test terminal, and a device including the test terminal.

  The test terminal according to the first aspect of the present invention for achieving the above object includes a plurality of sets of a power supply side conductor (21) connected to the power supply side and a load side conductor (11) connected to the load side. The power supply side conductor portion (21) and the load side conductor portion (11) are disposed opposite to the upper surface and the lower surface inside the housing (2), and normally the power supply side conductor portion (21 ) And the load side conductor portion (11) are electrically connected at the contacts (14, 24), and at the time of a predetermined test, by inserting a test plug, the movable contact plate (27) of the power source side conductor portion (21) and the A test plug is constructed so that the distance between the movable contact plate (17) of the load side conductor (11) is widened and the contacts (14, 24) are separated so that the power source side and the load side can be electrically separated. Electrical output of inserted or not inserted In order to make it possible, a contact portion comprising a pair of movable contact and fixed contact is provided.

  In the test terminal of the second aspect of the present invention, the movable contact (31) in the contact portion is the inner surface side of the housing (2) of the movable contact plate (17) of the load side conductor portion (11). The fixed contact (32) is positioned so as to be separated from the movable contact (31) when the test plug is not inserted, and to be in contact with the movable contact (31) when the test plug is inserted. The load-side conductor portion (11) is disposed on the support conductor (13) with an insulator (36) interposed therebetween.

  In the test terminal of the third aspect of the present invention, the movable contact (33) in the contact portion is the inner surface side of the casing (2) of the movable contact plate (27) of the power supply side conductor portion (21). The fixed contact (34) is positioned so as to be separated from the movable contact (33) when the test plug is not inserted, and to be in contact with the movable contact (33) when the test plug is inserted. The power supply conductor portion (21) is disposed on the support conductor (23) via an insulator (38).

  In the test terminal of the fourth aspect of the present invention, the movable contact (51) in the contact portion is opposite to the plug insertion port (1) of the movable contact plate (17) of the load side conductor portion (11). The fixed contact (52) is provided with an insulating plate (3) so as to extend the tip to the tip on the side, and the fixed contact (52) is separated from the movable contact (51) when the test plug is not inserted. It is located so as to be in contact with the movable contact (51) at the time of insertion.

  In the test terminal according to the fifth aspect of the present invention, the movable contact (51) in the contact portion is opposite to the plug insertion port (1) of the movable contact plate (17) of the load side conductor portion (11). The fixed contact (53) is provided via an insulating plate (3) so as to extend the tip at the tip on the side, and the fixed contact (53) contacts the movable contact (41) when the test plug is not inserted. It is characterized by being positioned away from the movable contact (51) when inserted.

  The trip coil control method according to the sixth aspect of the present invention is a test terminal having a plurality of sets of a power supply side conductor (21) connected to the power supply side and a load side conductor (11) connected to the load side. The power supply side conductor portion (21) and the load side conductor portion (11) are installed opposite to the upper surface and the lower surface inside the housing (2). Normally, the power supply side conductor portion (21) and the load side conductor portion (21) The conductor portion (11) is electrically connected at the contacts (14, 24). During a predetermined test, the movable contact plate (27) of the power source side conductor portion (21) and the load side conductor portion ( 11) The distance between the movable contact plates (17) is widened and the contacts (14, 24) are separated, so that the power source side and the load side can be electrically separated, and the test plug is inserted or not inserted. To enable electrical output of the state of A method of controlling a trip coil that operates a circuit breaker using a test terminal provided with a contact portion composed of a pair of movable contacts and a fixed contact, and inputs an operation command of a protective relay and before inserting a test plug By inputting a signal from the lock switch to be operated and inputting an output signal from the contact portion of the test terminal, the circuit breaker is prevented from being erroneously cut off.

  The protective relay according to a seventh aspect of the present invention is a test terminal having a plurality of sets of a power supply side conductor (21) connected to the power supply side and a load side conductor (11) connected to the load side, The side conductor portion (21) and the load side conductor portion (11) are disposed opposite to the upper surface and the lower surface inside the housing (2). Normally, the power source side conductor portion (21) and the load side conductor portion ( 11) are electrically connected at the contacts (14, 24), and at the time of a predetermined test, the movable contact plate (27) of the power supply side conductor (21) and the load side conductor (11) are inserted by inserting a test plug. The distance between the movable contact plates (17) is widened and the contacts (14, 24) are separated, so that the power source side and the load side can be electrically separated, and the test plug is inserted or not inserted. A pair of movable to enable electrical output A protective relay provided with a test terminal provided with a contact portion composed of a point and a fixed contact as a component, wherein an output signal from the contact portion of the test terminal is input in a circuit breaker tripping circuit formed by the protective relay The circuit breaker tripping circuit is provided with a contact to be performed.

  An automatic recovery device according to an eighth aspect of the present invention is a power supply side conductor connected to the power supply side in an automatic recovery device having a control circuit that outputs a signal for locking the function of the automatic recovery device and a signal for releasing the lock. (21) and a test terminal having a plurality of sets of load side conductors (11) connected to the load side, wherein the power source side conductor (21) and the load side conductor (11) are provided inside the casing (2). The power supply side conductor (21) and the load side conductor (11) are electrically connected to each other at the contacts (14, 24) at the time of a predetermined test. The distance between the movable contact plate (27) of the power supply side conductor portion (21) and the movable contact plate (17) of the load side conductor portion (11) is widened by the insertion of the contact side (14, 24), Electrically disconnect the power supply side and load side In order to be able to electrically output the insertion or non-insertion state of the test plug, a test terminal provided with a contact portion composed of a pair of movable contacts and a fixed contact is provided as a component. The control circuit is provided with a contact for inputting an output signal from a contact portion of the test terminal.

  The test terminal of the present invention can electrically output the inserted or not inserted state of the test plug by providing a contact portion on the test terminal. By taking this output into the trip circuit of the protective relay or the control circuit of the automatic recovery device, it is possible to prevent the circuit breaker from being erroneously shut down due to human error or malfunction of the movable contact plate, which has been a conventional problem.

  In addition, by incorporating the output into a remote control device, even in a remote control station that performs overall monitoring and control of the power transmission system, it recognizes whether the test plug is inserted or not inserted. be able to.

  The present invention extracts a change in the operation of the movable contact plate as information based on the output signal of the contact portion, and cuts off using the test terminal that can recognize the insertion / non-insertion state of the test plug and the output signal of the contact portion. A method for controlling a trip coil for operating a device, and a device that includes the test terminal and uses an output signal of a contact portion.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1A and 1B show a test terminal according to a first embodiment of the present invention, in which FIG. 1A is a left side view in which a part of the test terminal is cut out in a normal state (no test plug is inserted), and FIG. It is a left side view (a test plug is indicated by a two-dot chain line) in which a part of a test terminal is notched in (plug insertion). FIG. 2A is a circuit configuration diagram of a general trip circuit, and FIG. 2B is a circuit configuration diagram of the first embodiment. 1 and 3 are denoted by the same reference numerals.
The test terminal according to the first embodiment includes a pair of load side conductor portions 11 and a power source side conductor portion 21 that are disposed to face each other so as to be in contact with the upper surface and the lower surface inside the housing 2 having the test plug insertion port 1 on the side surface. Have multiple sets.

The load side conductor portion 11 includes a load side terminal 12, a support conductor 13, a movable contact plate 17 having a movable contact 14 and contact portions 15 and 16, and a spring 18.
One end of the load-side terminal 12 is fitted inside the housing 2 with a support conductor 13 arranged so as to be in contact with the inner surface of the housing 2, and the other end of the load-side terminal 12 protrudes from the inside of the housing 2 to the outside. ing. The movable contact 14 is installed on the movable contact plate 17 so as to come into contact with the fixed contact 24 of the cylindrical conductor portion 29 of the opposing power supply side conductor portion 21 at the normal time. The contact portions 15 and 16 are portions that come into contact with the test plug when the test plug is inserted. One end of the spring 18 is fixed to the support conductor 13, and the other end of the spring 18 is fixed to the movable contact plate 17. As shown in FIGS. 1A and 1B, the movable contact plate 17 and the spring 18 are deformed and contracted by inserting the test plug, but return to the original state when the test plug is removed.

The power supply side conductor portion 21 includes a power supply side terminal 22, a support conductor 23, a movable contact plate 27 having contact portions 25 and 26, a spring 28, a columnar conductor portion 29 having a fixed contact 24, and a columnar shape. It is composed of a substantially inverted L-shaped conductor 30 that fixes the conductor portion 29 to the support conductor 23.
One end of the power supply side terminal 22 is fitted inside the housing 2 with a support conductor 23 arranged so as to be in contact with the inner surface of the case 2, and the other end of the power supply side terminal 22 protrudes from the inside of the case 2 to the outside. ing. The contact portions 25 and 26 are portions that come into contact with the test plug when the test plug is inserted. One end of the spring 28 is fixed to the support conductor 23, and the other end of the spring 28 is fixed to the movable contact plate 27. The fixed contact 24 is installed on the cylindrical conductor 29 so as to be in contact with the movable contact 14 installed on the movable contact plate 17 of the load-side conductor portion 11 facing the normal time. As shown in FIGS. 1A and 1B, the movable contact plate 27 and the spring 28 are deformed and contracted by inserting the test plug, but return to the original state when the test plug is removed.

  As shown in FIG. 1A, in the normal state, that is, when a test plug is not inserted for testing a protective relay, the movable contact 14 of the movable contact plate 17 of the load side conductor 11 and the power source When the fixed contact 24 of the cylindrical conductor portion 29 of the side conductor portion 21 contacts, the load side and the power source side are connected. Further, as shown in FIG. 1B, when the test plug is inserted at the time of opening, that is, for the test of the protective relay, the movable contact plate 17 of the load side conductor portion 11 is inserted by inserting the test plug. Between the movable contact plate 27 of the load side conductor portion 11 and the columnar conductor portion 29 of the power source side conductor portion 21 which are in contact with each other. The fixed contact 24 is separated, and the load side and the power source side are electrically disconnected. That is, the test plug insertion causes an electrical change in the current and voltage values input to the protective relay connected to the load-side terminal 12 of the load-side conductor 11.

  When testing a protective relay with a test plug inserted, the operator must lock the trip circuit of the protective relay so that the protective relay does not output a trip signal to the circuit breaker due to the electrical changes described above. Insert the test plug. However, since the inspection work of the electrical equipment is a large and complicated work process, it may forget to lock the trip circuit. Forgetting this lock, when a current or voltage outside the set value is input for more than the specified time by inserting the test plug (element shortage occurs), the protective relay etc. determines that an accident has occurred and operates the circuit breaker. An unintended power outage occurs.

  In order to prevent such an erroneous shut-off, in the test terminal housing 2 of the present embodiment, two contact portions X1, X2 ( Two pairs of movable contacts and fixed contacts: 31 and 32, 33 and 34) are provided.

The contact portion X1 includes a movable contact 31 and a fixed contact 32. The movable contact 31 is provided on the inner surface side of the casing 2 of the movable contact plate 17 of the load side conductor portion 11 via an insulator 35, and the fixed contact 32 is a test plug as shown in FIG. When not inserted, it is separated from the movable contact 31, and as shown in FIG. 1B, it is positioned so as to be in contact with the movable contact 31 when the test plug is inserted, and is disposed on the load side conductor portion 11 via an insulator 36.
The contact portion X <b> 2 includes a movable contact 33 and a fixed contact 34. The movable contact 33 is provided on the inner surface side of the casing 2 of the movable contact plate 27 of the power supply side conductor portion 21 via an insulator 37, and the fixed contact 34 is a test plug as shown in FIG. When not inserted, it is separated from the movable contact 33, and as shown in FIG. 1B, it is positioned so as to be in contact with the movable contact 33 when the test plug is inserted, and is disposed on the power supply side conductor portion 21 via an insulator 38.

  If the test plug is not inserted, the two contact portions X1 and X2 output a “no voltage” signal because the movable contacts 31 and 33 and the fixed contacts 32 and 34 are separated from each other. If the test plug is inserted, the movable contacts 31 and 33 and the fixed contacts 32 and 34 are in contact with each other, so that a “voltage present” signal is output. By using these output signals, it is possible to prevent the circuit breaker from being erroneously shut down due to forgetting to lock the trip circuit. The mode will be described below.

As shown in FIG. 2 (a), in a normal trip circuit, a normally open contact (hereinafter referred to as Ry operation contact) 41 that is closed by an operation command of the protective relay and a circuit breaker that malfunctions before the test terminal is inserted. A contact 42 of a lock switch (hereinafter referred to as a lock SW) that is operated to prevent a trip coil (TC) 43 that operates an operation mechanism that breaks the circuit breaker is connected in series. This circuit may be provided with an open part such as a limit switch in order to prevent the trip coil from being burned out when the trip circuit is formed.
In this case, when the test plug is inserted without forgetting to lock the lock SW, the contact 42 of the lock SW remains closed, and an operation command of the protective relay is issued by an electrical change caused by insertion of the test plug, and the Ry operation contact 41 Closes and a trip circuit is formed.
However, in this embodiment, as shown in FIG. 2B, a normal trip circuit is provided with a normally closed contact (T _X1 ) 44 for inputting the output signal of the contact X1 of the test terminal in series. The normally closed contact (T _X1 ) 44 is opened because a “voltage present” signal is input from the contact X1 when the test plug is inserted, so that a trip circuit is not formed. That is, when the test plug is inserted by the normally closed contact (T _X1 ) 44, the trip circuit is forcibly locked, and even if an operation command is issued from the protective relay (even if the Ry operation contact 41 is closed), a current is supplied to the trip coil (TC) 43. Since the circuit does not flow, the circuit breaker does not operate, and erroneous interruption can be prevented.

  Furthermore, in the normal trip circuit shown in FIG. 2A, the circuit breaker may be unintentionally interrupted as described above. For example, after the test of the protective relay or the like is completed, the test plug must be removed and then the trip circuit lock SW42 must be unlocked. In addition, malfunctions of the movable contact plates 17 and 27 of the test terminal occurred, and the distance between the movable contact plate 17 of the load side conductor portion 11 and the movable contact plate 27 of the power source side conductor portion 21 increased even when the test plug was removed. In this case, the lock SW 42 is unlocked without noticing that the movable contact 14 of the load-side conductor 11 and the fixed contact 24 of the power-side conductor 21 remain apart.

However, as shown in FIG. 2B, by providing the trip circuit with a normally closed contact (T _X1 ) 44 for inputting the output signal of the contact X1 of the test terminal, as long as the test plug is inserted, the contact The output signal of “voltage present” of _X1 is input to the normally closed contact (T _X1 ) 44, and the normally closed contact (T _X1 ) 44 is opened and no trip circuit is formed. Even when the movable contact plates 17 and 27 of the test terminal are malfunctioning, the movable contact 31 and the fixed contact 32 remain in contact with each other, so that the normally closed contact (T _X1 ) 44 does not form an open trip circuit. As described above, according to the present invention, not only forgetting to lock the lock switch but also forgetting to remove the test plug or malfunctioning of the circuit breaker due to malfunction of the movable contact plates 17 and 27 can be prevented.

In addition, as shown in FIG. 2B, the output signal of the contact X2 of the test terminal is transmitted to the control station via the remote control device by being input to the remote control device by the _normally open contact (T _X2 ) 45. can do. This makes it possible to confirm whether the test plug is inserted or not inserted even if the control station that monitors and controls the system is located at a remote location.

In this embodiment, since the output signals of the contact portions X1 and X2 of the test terminal are the same, the contact portion X2 is not provided in the test terminal and only the contact portion X1 is provided, and the output signal of the contact portion X1 is input to the remote control device. Can also be used. Further, the output signal of the contact portion X1 or X2 can be freely used by changing the way of capturing the signal according to the connected device.
Further, the test terminal has a plurality of sets of the load side conductor portion 11 and the power source side conductor portion 21 in accordance with the use, but to which load side conductor portion 11 or the power source side conductor portion 21 the contact portions X1 and X2 are provided. You can choose how many you want. An integrated test plug is inserted into the test terminal in accordance with the number of sets of the load side conductor portion 11 and the power source side conductor portion 21 of the test terminal. It is not necessary to provide a plurality of contact portions. However, if a plurality of contact parts X1 and X2 are provided, the output signals of each are compared and displayed as information on the local switchboard or control panel of the control station, the insertion or non-insertion state of the test plug is more accurate. In addition, it is possible to recognize the occurrence of malfunction of the individual movable contact plates 17 and 27 and the occurrence of malfunction of the contact portions X1 and X2.

3A and 3B are diagrams showing a test terminal according to a second embodiment of the present invention. FIG. 3A is a left side view in which a part of the test terminal is cut out in a normal state (no test plug is inserted), and FIG. It is a left side view (test plug is indicated by a two-dot chain line) with a part of the test terminal cut out at the time (test plug insertion). In the drawings, the contact portions Y1, Y2 are schematically shown. FIG. 4 shows a main part of an installation example of the automatic recovery apparatus. FIG. 5 is a diagram illustrating an example of a block diagram of an automatic recovery apparatus, and FIG. 6 is a diagram illustrating an example of a block control circuit configuration of the automatic recovery apparatus according to the second embodiment.
The test terminal of Example 2 differs from the test terminal of Example 1 in the position of the contact portion. In the test terminal housing 2, two contact portions Y 1 and Y 2 (two pairs of movable contacts and fixed contacts: 51 and 52 are provided in order to be able to electrically output a test plug inserted or not inserted state. , 51 and 53).

One contact portion Y <b> 1 includes a movable contact 51 and a fixed contact 52. The movable contact 51 is provided via the insulating plate 3 so as to extend the distal end of the movable contact plate 17 of the load side conductor portion 11 on the opposite side of the plug insertion port 1, and the fixed contact 52 is As shown in FIG. 3A, when the test plug is not inserted, it is separated from the movable contact 51, and as shown in FIG. 3B, it is positioned so as to be in contact with the movable contact 51 when the test plug is inserted.
The other contact portion Y 2 includes a movable contact 51 and a fixed contact 53. The fixed contact 53 is in contact with the movable contact 51 when the test plug is not inserted as shown in FIG. 3A, and is separated from the movable contact 51 when the test plug is inserted as shown in FIG. 3B. To do.

That is, the contact portion Y1 can output a “no voltage” signal because the movable contact 51 and the fixed contact 52 are separated if the test plug is not inserted, and is movable if the test plug is inserted. Since the contact 51 and the fixed contact 52 are in contact, a “voltage present” signal can be output. Further, the contact portion Y2 is in a state in which the movable contact 51 and the fixed contact 53 are in contact with each other if the test plug is not inserted, so that a “voltage present” signal can be output, and if the test plug is inserted, the contact Y2 is movable. Since the contact 51 and the fixed contact 53 are separated, a “no voltage” signal can be output.
By using such output signals of the contact portions Y1 and Y2, as shown in the first embodiment, it is possible to control the formation of the trip circuit of the protective relay and prevent the circuit breaker from being erroneously interrupted. Of course.

In the second embodiment, an example in which the output signals of the contact portions Y1 and Y2 are used in the automatic recovery device will be described.
The automatic recovery device has a function (trip command function) that sends a trip signal when an accident or the like occurs on the power transmission line, and interrupts the electrical line with a circuit breaker. This is a device having a function (closing command function) for reclosing the circuit breaker and automatically recovering the power transmission line that has failed (hereinafter referred to as the ARE function together with the trip command function and the closing command function).

  FIG. 4 is a main part of an arrangement example of the automatic recovery device in the substation. A circuit breaker (CB) 63 is installed in a power transmission line 62 connected from the bus 61 to the other substation through the substation. The bus voltage VB1, VB2 from the instrument transformer (PT) 64 and the line voltages VL1, VL2 from the instrument transformer (PT) 65 are passed through a voltage test terminal (PTT) 67 inside the automatic recovery device 66. Are input to the calculation unit 68. The computing unit 68 of the automatic recovery device sends a CB control signal 69 based on the input information to control the circuit breaker 63.

FIG. 5 is a diagram showing an example of a block diagram of the shutoff control circuit of the automatic recovery device.
As shown in FIG. 5, the ARE function control circuit of the automatic restoration device is an “ARE function use / non-use changeover switch” that is linked to use / non-use in the operation panel of the automatic restoration equipment (Automatic Restoration Equipment). (Hereinafter referred to as ARE panel use / non-use switch) S1 and “ARE function use / non-use switch” on the operation panel of the remote control monitoring device (Tele Control Equipment) (hereinafter, TC board use / non-use) S2), which is connected to keep relays (latch relays) 71 and 72, respectively.
The use / nonuse switch S1 of the ARE panel is operated by a worker at the work site. In addition, the use / nonuse switch S2 of the TC panel is provided in a remote control device such as a remote control station that supervises the entire power receiving equipment and performs monitoring control. It is to switch when it is necessary to set the use.
The keep relay closes (or opens) the contact with temporary energization, and remains closed (or open) until the energization for opening (or closing) the contact occurs even after the energization is cut off. It has a function that can be retained. When the use / non-use switch S1 of the ARE panel and the use / non-use switch S2 of the TC board are set to “use”, the contact of the keep relay 71 that outputs the lock release signal of the ARE function is closed (SET), and the ARE function The contact of the keep relay 72 which outputs the lock signal is connected to open (RESET). In addition, when “not used”, the contact of the keep relay 71 that outputs the unlock signal of the ARE function is opened (RESET), and the contact of the keep relay 72 that outputs the lock signal of the ARE function is closed (SET). ing. Therefore, when the use / non-use switch S1 of the ARE panel and the use / non-use switch S2 of the TC board are “use”, the keep relay 71 outputs the lock release signal of the ARE function, and the keep relay 72 locks the ARE function. No signal is output. When “not used”, the keep relay 72 outputs an ARE function lock signal, and the keep relay 71 does not output an ARE function lock release signal. (Hereinafter, the keep relays 71 and 72 will be described when the contacts are closed (when connected to SET), and omitted when they are opened (when connected to RESET).)

When testing the automatic recovery device 66, the operator sets a changeover switch (hereinafter referred to as 43TL) to “test” so as not to send a trip signal from the automatic recovery device 66 to the circuit breaker 63 in advance. A test plug is inserted into a voltage test terminal (PTT) provided in the inside. This is because only the trip command function of the ARE function can be locked by switching 43TL to “test”. However, the operator may forget to switch the 43TL. In this case, the load side (11 _VB1 , 11 _VB2 , 11 _VL1 , 11 _VL2 ) is disconnected from the power source side (21 _VB1 , 21 _VB2 , 21 _VL1 , 21 _VL2 ) by inserting the test plug. The input becomes insufficient, and a trip signal 69 is output from the automatic recovery device 66 to the circuit breaker 63, causing the circuit breaker 63 to operate.

FIG. 6 is a diagram illustrating an example of the configuration of the cutoff control circuit of the automatic recovery apparatus according to the second embodiment.
The circuit shown in FIG. 6 is obtained by incorporating the output signals of the contact portions Y1 and Y2 in the test terminal of this embodiment into the ARE function control circuit of the automatic recovery device in order to solve the above-described problem. Preventing erroneous shut-off by providing a contact to input the output from the contact part in the normal ARE function use circuit (I-1 (A), I-2 (A)) or ARE function non-use circuit (IV) Made possible. In addition, the ARE function use circuit (I-1 (B), I-2 (B), II) and the ARE function non-use circuit (IV) are connected to 43 TL, an actual circuit breaker (CB) disconnection test disconnect terminal (hereinafter, actual By taking in the condition of “UTT for shielding”, it was possible to cope with the test of the re-instruction command function of the automatic recovery device itself, the actual circuit breaker breaking test, and the like. The actual shielding UTT will be described later.
Circuits (used circuits I-1 (A) (B), I-2 (A) (B), II) connected to a keep relay 71 (SET) that outputs an unlock signal for the ARE function, and an ARE function Each circuit of the circuits (non-use circuits III-1, III-2, IV) connected to the keep relay 72 (SET) that outputs the lock signal has the following configuration.

Using circuits I-1 (A), I -1 (B) is in contact S1 ₁ to "contact" signal of the contact portion Y1 is input to the time of use of the ARE boards and unused switch S1 is "use" A circuit in which a normally closed contact T _Y1 -1 and a contact UT-1 that is closed only when the actual blocking UTT is “locked (OFF)” are connected in series.
The actual blocking UTT is used when testing an actual circuit breaker, and is a switch that is “locked (OFF)” only when testing an actual circuit breaker. The actual circuit breaker test is performed after the circuit breaker is disconnected from the power transmission system by a bus disconnector (LBS) so that an electric shock accident or the like does not occur or an unnecessary power failure does not occur. A test signal is input from the test plug, and a test for confirming whether the circuit breaker actually operates by the ARE function is performed.

Using circuits I-2 (A), I -2 (B) is in contact S2 ₁ to "contact" when the use of TC boards and unused switch S2 is "used", the signal of the contact portion Y1 is input A circuit in which a normally closed contact T _Y1 -1 and a contact UT-1 that is closed only when the actual blocking UTT is “locked (OFF)” are connected in series.

Using circuit II includes the contact S3 ₁ pushbutton switches (used for testing switches) S3 that is used only when the testing of the automatic recovery device itself, again only when the testing of the automatic recovery device itself "normal" The contact 43TL-1 of the change-over switch 43TL that is switched from “test” to “test” is connected in series. The contact 43TL-1 is “open” when 43TL is “normal” and is “closed” when “test”.
43TL is a switch that makes it possible to test the automatic recovery device without outputting a trip signal to the circuit breaker. If 43TL is “test”, the trip command function of the automatic recovery device is not used regardless of the use / nonuse of the use / nonuse switch S1 of the ARE panel and the use / nonuse switch S2 of the TC board. It is locked and no trip signal is sent to the circuit breaker. For example, if 43TL is “test”, the automatic recovery device does not send a trip signal to the circuit breaker even if the user forgets to remove the test plug and sets the use / nonuse switch of the ARE panel to “use” with the test plug inserted. If 43TL is “normal”, the test use switch cannot be pressed.

  If any of the above five use circuits is connected, the contact of the keep relay 71 that outputs the unlock signal for the ARE function is closed, and the ARE function of the automatic recovery device can be used, and this state is maintained.

Unused circuits III-1 nonuse circuit III-2 includes a circuit consisting of the contact S1 ₂ that use and non-use switch S1 of ARE plate is "against" when "unused" respectively, use of TC boards and not a circuit consisting of the contact S2 ₂ to "contact" when use switch S2 is "unused", no different from those described in FIG.

The unused circuit IV is a circuit in which four contacts are connected in series.
The first contact T _Y1 -2 is a normally open contact, and it is determined from the output signals of the contact portions Y1 and Y2 of the test terminal of Example 2 that the test plug is inserted (hereinafter referred to as “open”). The output signal of the contact portion Y1 is input only when the test plug is not inserted (hereinafter referred to as normal time). That is, the contact portions Y1 and Y2 at the time of opening are in a state where the contact portion Y1 is “closed” and the contact portion Y2 is “open” as shown in FIG. contacts Y1 is "voltage Yes", and only when the contact part Y2 is "voltage Mu", signal "voltage present" contact portion Y1 is input to the contact T _{Y1 -2,} contact "closed ”
The second contact L-b is a normally closed contact to which an output signal from the relay Ry (L) shown in FIG. 4 is input, and this Ry (L) is a voltage test in the automatic recovery device 66. It is installed on the computing unit 68 side of the terminal. As shown in FIG. 4, the bus voltages VB1 and VB2 and the line voltages VL1 and VL2 are normally input to the calculation unit 68 via a voltage test terminal (PTT) 67 in the automatic recovery device 66. When opened, the load-side conductor portions 11 _VB1 , 11 _VB2 , 11 _VL1 , and 11 _VL2 of the PTT are electrically disconnected from the power-side conductor portions 21 _VB1 , 21 _VB2 , 21 _VL1 , and 21 _VL2 by inserting a test plug. That is, in the state where the test plug is not inserted, Ry (L) connecting VL1 and VL2 outputs a “voltage present” signal, but outputs a “no voltage” signal when the test plug is inserted. Therefore, the second contact L-b to which the Ry (L) output signal is input is “open” when the test plug is not inserted, so that the “voltage present” signal is input. Since the “No” signal is input, it is “closed”. Note that the same applies when an output signal of Ry (B) connecting VB1 and VB2 is used.
The third contact 43TL-2 is a contact to which the signal of the changeover switch 43TL is input. Here, unlike the case of the use circuit II, 43TL-2 is “closed” when 43TL is “normal” and is “open” when “test”.
The fourth contact UT-2 is a contact of the above-described actual blocking UTT, but unlike the case of the use circuits I-1 and I-2, only when the actual blocking UTT is “locked (OFF)”. Open contact.

If any of the above three unused circuits is connected, the contact of the keep relay 72 that outputs the lock signal of the ARE function is closed, and the ARE function of the automatic recovery device cannot be used, and the state is maintained.

Next, the open / close states of the contacts of each circuit in each case of the automatic recovery apparatus will be described with reference to FIG.

When the automatic recovery device is used normally, it is as follows.
In this case, since the test plug is not inserted, the contact portion Y1 in the test terminal of the second embodiment outputs a signal “no voltage” and the contact portion Y2 outputs a signal “voltage present”. The state of the test terminal is determined to be “normal” based on the output signals of the contact portion Y1 and the contact portion Y2.
The open / close state of each switch and contact is as follows.
(1) use and non-use switch S1 of the ARE board is a "use", S1 ₁ is Ji "closed", S1 ₂ is the phrase "open".
(2) “No voltage” is input to the normally closed contact T _Y1 −1 to which the Y1 signal is input, and T _Y1 −1 is “closed”.
(3) Since the actual interrupting UTT is not during the actual circuit breaker test, it is “unlocked (ON)”, UT-1 is “open”, and UT-2 is “closed”.
(4) use and non-use switch S2 of the TC panel is a "use", S2 ₁ is Ji "closed", S2 ₂ the phrase "open".
(5) test for use switch S3 is "OFF", S3 ₁ is the phrase "open".
(6) The changeover switch 43TL is “normal”, 43TL-1 is “open”, and 43TL-2 is “closed”.
(7) to the contact T _{Y1 -2} output signal of the contact portion Y1 is input only when it recognizes the time open, since it is not determined that a test plug is not inserted "when opened", the output signal is not input, T _Y1 -2 remains “open”.
(8) Since the test plug is not inserted into the normally closed contact L-b to which the output signal of the relay Ry (L) is input, “with voltage” is input from Ry (L). ,"open.

Therefore, from the above, the connected / unconnected state of each circuit is as follows.
1) Since the used circuits I-1 (A) and I-2 (A) have S1 ₁ , S2 ₁ and T _Y1 -1 closed, the circuits are connected.
2) As for the used circuits I-1 (B) and I-2 (B), UT-1 is open and the circuits are not connected.
3) Using circuit II is, S3 ₁ also 43TL-1 also are open, the circuit does not lead.
4) In the unused circuits III-1 and III-2, S1 ₂ and S2 ₂ are opened, and the circuits are not connected.
5) The unused circuit IV has both T _Y1 -2 and _Lb open, and the circuit is not connected.
Therefore, the use circuit I-1 closes the contact of the keep relay 71 and outputs a lock release signal.

Describes misoperations that occur during testing of automatic recovery devices.
When testing the automatic recovery device, the test plug is inserted after switching 43TL from “normal” to “test”. By switching 43TL, the automatic recovery device will send a trip signal to the circuit breaker regardless of whether the ARE panel is used or not used or the TC panel is used or not used as described above. Can be prevented. However, there is a case where a test plug is inserted while forgetting to switch 43TL to “test”, and the circuit breaker is erroneously cut off.
Conversely, when the test of the automatic recovery device is completed and returned to normal use, 43TL is switched from “Test” to “Normal” after unplugging the test plug, but in this case too, I forgot to unplug the test plug. However, 43TL may be switched to “normal” while the test plug is inserted. Even if the test plug is pulled out, the movable contact plate 14 does not return to the normal position due to the malfunction of the movable contact plate 17, and the 43TL is returned to "normal" with the power supply side and the load side disconnected. In some cases. In these cases, the circuit breaker is erroneously interrupted for the same reason.
At this time, since the test plug is inserted or in a state similar to that, the contact portion Y1 in the test terminal of the second embodiment outputs a signal “with voltage”, and the contact portion Y2 outputs a signal “without voltage”. The state of the test terminal is determined to be “when open” based on the output signals of the contact portion Y1 and the contact portion Y2.
The open / close state of each switch and contact is as follows.
(1) use and non-use switches S1 of the ARE board is a "use", S1 ₁ is Ji "closed", S1 ₂ is the phrase "open".
(2) The normally closed contact T _Y1 −1 to which the Y1 signal is input is input with “voltage present”, and T _Y1 −1 is “open”.
(3) Since the actual interrupting UTT is not during the actual circuit breaker test, it is “unlocked (ON)”, UT-1 is “open”, and UT-2 is “closed”.
(4) use and non-use switch S2 of the TC panel is a "use", S2 ₁ is Ji "closed", S2 ₂ the phrase "open".
(5) test for use switch S3 is "OFF", S3 ₁ is the phrase "open".
(6) The changeover switch 43TL is “normal”, 43TL-1 is “open”, and 43TL-2 is “closed”.
(7) to the contact T _{Y1 -2} output signal of the contact portion Y1 is input only when it recognizes when opened, the test plug is inserted or the same state as it by being determined to be "upon opening" The output signal “with voltage” of the contact portion Y1 is input, and T _Y1 -2 is “closed”.
(8) By inserting the test plug, Ry (L) outputs “no voltage” and Lb is “closed” at the normally closed contact to which the output signal of the relay is input.

Therefore, from the above, the connected / unconnected state of each circuit is as follows.
1) _TY1 -1 is open in the used circuits I-1 (A) and I-2 (A), and the circuits are not connected.
2) As for the used circuits I-1 (B) and I-2 (B), UT-1 is open and the circuits are not connected.
3) Using circuit II is, S3 ₁ also 43TL-1 also are open, the circuit does not lead.
4) In the unused circuits III-1 and III-2, S1 ₂ and S2 ₂ are opened, and the circuits are not connected.
5) non-use circuit _IV, since _T Y1 -2 also L-b also 43TL-2 also UT-2 is also closed, the circuit is connected.
Therefore, the non-use circuit IV closes the contact of the keep relay 72 and outputs a lock signal. As a result, the trip signal output to the circuit breaker is locked, and erroneous circuit breakage of the circuit breaker can be prevented.

When actually testing the automatic recovery device, it is as follows.
When testing the automatic recovery device, after switching 43TL from “normal” to “test”, a test plug is inserted and the test use switch S3 is turned “ON”. By switching 43TL, the use / nonuse switch S1 of the ARE panel and the use / nonuse switch S2 of the TC board are used as described above, regardless of whether the test plug is inserted or not inserted. The automatic recovery device does not send a trip signal to the circuit breaker.
The open / close states of the switches and contacts of the circuit that are not disabled by 43TL are as follows.
(1) test for use switch S3 is "ON", S3 ₁ is "closed" Jill.
(2) The changeover switch 43TL is “test”, 43TL-1 is “closed”, and 43TL-2 is “open”.

Therefore, from the above, the connected / unconnected state of each circuit is as follows.
1) The used circuits I-1 (A) and I-2 (A) do not send a trip signal to the circuit breaker because 43TL is switched to “test”.
2) The use circuits I-1 (B) and I-2 (B) do not send a trip signal to the circuit breaker because 43TL has been switched to “test”.
3) Using circuit II is, S3 ₁ also because 43TL-1 Close, circuit leads.
4) The unused circuits III-1 and III-2 do not send a trip signal to the circuit breaker by switching 43TL to “test”.
5) For the unused circuit IV, 43TL-2 is opened and the circuit is not connected.
Therefore, since it is switched to the “test” of 43TL, it is possible to test the shut-off function of the automatic recovery device by using circuit II without sending a trip signal to the circuit breaker.

When testing an actual circuit breaker by inputting a test signal from a test plug, the test is as follows.
Since the test plug is inserted, the contact portion Y1 in the test terminal of the second embodiment outputs a signal “with voltage”, and the contact portion Y2 outputs a signal “without voltage”. The state of the test terminal is determined to be “when open” based on the output signals of the contact portion Y1 and the contact portion Y2.
The open / close state of each switch and contact is as follows.
(1) use and non-use switch S1 of the ARE board is a "use", S1 ₁ is Ji "closed", S1 ₂ is the phrase "open".
(2) The normally closed contact T _Y1 −1 to which the Y1 signal is input is input with “voltage present”, and T _Y1 −1 is “open”.
(3) Since the actual shielding UTT is not during the actual circuit breaker test, it is “locked (OFF)”, UT-1 is “closed”, and UT-2 is “open”.
(4) use and non-use switch S2 of the TC panel is a "use", S2 ₁ is Ji "closed", S2 ₂ the phrase "open".
(5) test for use switch S3 is "OFF", S3 ₁ is the phrase "open".
(6) The changeover switch 43TL is “normal”, 43TL-1 is “open”, and 43TL-2 is “closed”.
(7) to the contact T _{Y1 -2} output signal of the contact portion Y1 is input only when it recognizes when opened is a test plug inserted by being judged as "during opening", the output signal is input , T _Y1 -2 is “closed”.
(8) “No voltage” is input from Ry (L) to the normally closed contact Lb to which the output signal of the relay Ry (L) is input, and Lb is “closed” by inserting the test plug. The

Therefore, from the above, the connected / unconnected state of each circuit is as follows.
1) _TY1 -1 is open in the used circuits I-1 (A) and I-2 (A), and the circuits are not connected.
2) Since the used circuits I-1 (B) and I-2 (B) are closed at S1 ₁ , S2 ₁ and UT-1, the circuits are connected.
3) Using circuit II is, S3 ₁ also 43TL-1 also are open, the circuit does not lead.
4) In the unused circuits III-1 and III-2, S1 ₂ and S2 ₂ are opened, and the circuits are not connected.
5) In the unused circuit IV, UT-2 is opened and the circuit is not connected.
Therefore, the contacts of the keep relay 72 are closed by the use circuits I-1 (B) and I-2 (B), and a lock release signal is output. Thereby, it is possible to test whether or not the actual circuit breaker actually interrupts the electric circuit by the test signal input from the test plug.

As described above, the circuit (FIG. 6) using the terminal of the second embodiment of FIG. 3 does not affect the normal use and test of the automatic recovery device and the interruption test of the actual circuit breaker. It is possible to prevent the circuit breaker from being erroneously shut off due to forgetting to switch 43TL or forgetting to remove the test plug during the test. Further, since the circuit shown in FIG. 6 takes in the condition of the contact portion Y1 into the circuit I-1 (A) and I-2 (A) used during the normal operation of the automatic recovery apparatus, T _Y1 − The contact 1 is a normally closed contact. This is to prevent the use circuit from being formed due to the contact failure of the contact portion Y1, and the automatic recovery device from becoming inoperable. In addition, when a contact failure occurs in either of the contact parts Y1 and Y2, a "no voltage" signal or a "voltage present" signal is output from both contact parts. It is also possible to recognize the occurrence of an abnormality in the contact portion, without being determined as “open” or “normal”.

In this embodiment, as in the first embodiment, the output signal of the contact portion Y2 of the test terminal is inputted to the _normally open contact (T _Y2 ) of the remote control device, so that the remote control device can be connected to the remote control station. It is possible to confirm the insertion or non-insertion of the test plug at the control station.
Further, the output signal of the contact portion Y1 or Y2 can be freely used as in the first embodiment by changing the way of capturing the signal according to the connected device. However, in the second embodiment, at least one pair of contact portions Y1 and Y2 is required to recognize whether it is normal or open, but it is possible to freely select where and how many. As with the first embodiment, the number of pairs of contact portions Y1 and Y2 is also recognized in order to recognize the occurrence of defects in the movable contact plates 17 and 27 and each contact portion, and to obtain reliable information on the insertion or non-insertion of the test plug. In addition, it is better to use output signals of a plurality of contact portions.
Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention as long as the apparatus has a function capable of processing or using an input signal from the contact portion as information. is there.

  Since the test terminal of the present invention outputs the state of operation of the movable contact plates 17 and 27 through the contact portion, it can cope with various devices depending on how the output signal is captured.

The test terminal of Example 1 of this invention is shown, (a) is the left view which notched a part of the test terminal in the normal time, (b) The left view which notched a part of the test terminal at the time of opening It is. It is a circuit block diagram of a trip circuit, (a) is a general circuit block diagram, (b) is a circuit block diagram showing an example of the first embodiment. It is a figure which shows the test terminal of Example 2 of this invention, (a) is the left view which notched some test terminals in the normal time, (b) was notched some test terminals in the open time It is a left side view. The contact portions Y1, Y2 are schematically shown. It is the figure which showed the principal part of the example of installation of an automatic recovery apparatus. It is the figure which showed an example of the interruption | blocking control circuit block diagram of an automatic recovery apparatus. It is a figure which shows an example of the interruption | blocking control circuit structure of the automatic recovery apparatus about 2nd Example.

DESCRIPTION OF SYMBOLS 1 Test plug insertion port 11 Load side conductor part 21 Power supply side conductor part 14, 24 Contact 15, 16, 25, 26 Contact part 17, 27 Movable contact plate 31, 33, 51 Movable contact 32, 34, 42, 43 Fixed contact X1, X2, Y1, Y2 contact part

Claims (8)

A test terminal having a plurality of sets of power supply side conductors (21) connected to the power supply side and load side conductors (11) connected to the load side;
The power supply side conductor portion (21) and the load side conductor portion (11) are installed opposite to the upper surface and the lower surface inside the housing (2),
Normally, the power supply side conductor (21) and the load side conductor (11) are electrically connected at the contacts (14, 24),
During a predetermined test, insertion of a test plug increases the distance between the movable contact plate (27) of the power supply side conductor (21) and the movable contact plate (17) of the load side conductor (11), and contacts (14, 24). ) Is separated, the power supply side and the load side can be electrically disconnected,
A test terminal comprising a contact portion comprising a pair of movable contacts and a fixed contact in order to enable electrical output of a test plug inserted or not inserted state.
The movable contact (31) in the contact portion is provided on the inner surface side of the housing (2) of the movable contact plate (17) of the load side conductor portion (11) via an insulator (35),
The fixed contact (32) is positioned so as to be separated from the movable contact (31) when the test plug is not inserted and in contact with the movable contact (31) when the test plug is inserted, and supports the load side conductor (11). 2. Test terminal according to claim 1, characterized in that it is arranged on the conductor (13) via an insulator (36).
The movable contact (33) in the contact portion is provided on the inner surface side of the casing (2) of the movable contact plate (27) of the power supply side conductor portion (21) via an insulator (37),
The fixed contact (34) is located away from the movable contact (33) when the test plug is not inserted, and is in contact with the movable contact (33) when the test plug is inserted, and supports the power supply side conductor portion (21). 3. The test terminal according to claim 1, wherein the test terminal is arranged on the conductor (23) via an insulator (38).
The movable contact (51) in the contact portion extends to the distal end portion of the movable contact plate (17) of the load side conductor portion (11) opposite to the plug insertion port (1). , Provided via an insulating plate (3),
The fixed contact (52) is located so as to be separated from the movable contact (51) when the test plug is not inserted and to be in contact with the movable contact (51) when the test plug is inserted. Test terminal according to 2 or 3.
The movable contact (51) in the contact portion extends to the distal end portion of the movable contact plate (17) of the load side conductor portion (11) opposite to the plug insertion port (1). , Provided via an insulating plate (3),
The fixed contact (53) is positioned so as to come into contact with the movable contact (51) when the test plug is not inserted and away from the movable contact (51) when the test plug is inserted. Test terminal according to 2, 3 or 4.
A test terminal having a plurality of sets of a power supply side conductor portion (21) connected to the power supply side and a load side conductor portion (11) connected to the load side, wherein the power supply side conductor portion (21) and the load side conductor portion ( 11) is installed opposite to the upper and lower surfaces inside the housing (2), and the power supply side conductor (21) and the load side conductor (11) are electrically connected at the contacts (14, 24) in normal times. In the predetermined test, the interval between the movable contact plate (27) of the power supply side conductor portion (21) and the movable contact plate (17) of the load side conductor portion (11) is widened by inserting a test plug. (14, 24) is configured so that the power supply side and the load side can be electrically disconnected by separating, and a pair of test plugs can be electrically output in order to enable electrical output of the inserted or not inserted state. A contact part consisting of a movable contact and a fixed contact is provided. Using the test terminal, a method for controlling a trip coil to operate the circuit breaker,
Enter the operation command of the protective relay,
Input the signal by the lock switch operated before inserting the test plug,
A trip coil control method characterized in that an erroneous output of a circuit breaker is prevented by inputting an output signal from a contact portion of the test terminal.
A test terminal having a plurality of sets of a power supply side conductor portion (21) connected to the power supply side and a load side conductor portion (11) connected to the load side, wherein the power supply side conductor portion (21) and the load side conductor portion ( 11) is installed opposite to the upper and lower surfaces inside the housing (2), and the power supply side conductor (21) and the load side conductor (11) are electrically connected at the contacts (14, 24) in normal times. In the predetermined test, the interval between the movable contact plate (27) of the power supply side conductor portion (21) and the movable contact plate (17) of the load side conductor portion (11) is widened by inserting a test plug. (14, 24) is configured so that the power supply side and the load side can be electrically disconnected by separating, and a pair of test plugs can be electrically output in order to enable electrical output of the inserted or not inserted state. A contact part consisting of a movable contact and a fixed contact is provided. A protection relay with a test terminal as components,
A circuit breaker tripping circuit formed by the protection relay, wherein the circuit breaker tripping circuit has a contact for inputting an output signal from a contact portion of the test terminal.
In the automatic recovery device having a control circuit that outputs a signal for locking the function of the automatic recovery device and a signal for releasing the lock,
A test terminal having a plurality of sets of a power supply side conductor portion (21) connected to the power supply side and a load side conductor portion (11) connected to the load side, wherein the power supply side conductor portion (21) and the load side conductor portion ( 11) is installed opposite to the upper and lower surfaces inside the housing (2), and the power supply side conductor (21) and the load side conductor (11) are electrically connected at the contacts (14, 24) in normal times. In the predetermined test, the interval between the movable contact plate (27) of the power supply side conductor portion (21) and the movable contact plate (17) of the load side conductor portion (11) is widened by inserting a test plug. (14, 24) is configured so that the power supply side and the load side can be electrically disconnected by separating, and a pair of test plugs can be electrically output in order to enable electrical output of the inserted or not inserted state. A contact part consisting of a movable contact and a fixed contact is provided. Equipped with a test terminal as components,
An automatic recovery device characterized in that a contact for inputting an output signal from a contact portion of the test terminal is provided in the control circuit.

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