JP4605720B2 - Automatic feeding device - Google Patents

Description

  The present invention relates to an automatic loading device that can detect the deterioration or failure of a lightning arrester and notify the outside of the lightning arrester deterioration or failure.

  A load device such as a communication device of a radio base station is always supplied with power and is in an operating state. A breaker is usually installed on the power supply side of the load device. In addition to an overcurrent or leakage, the breaker operates due to lightning surge or noise, etc., and shuts off the power supply to the load device. Sometimes. In such a case, the worker went to the place where the breaker to which the load device is connected is located, inspected the wiring, the load device, etc., and then turned on again.

  However, every time the breaker operates, workers may go to the site, especially for load equipment that is located in remote locations, where the burden on the workers is large and can be restored quickly. There was a problem that I could not. In particular, if the cause of the operation of the breaker is a temporary thing such as a lightning surge, the power supply to the load device can be restored only by re-inserting the breaker. Therefore, an automatic loading device as shown in Patent Document 1 is used. This automatic loading device is a device for automatically returning the breaker after the set time elapses and returning automatically. It is known that when it is determined that an abnormality such as an electric circuit has not been resolved in the automatic charging device, the recharging is stopped and the abnormality is notified to the outside such as a monitoring center by communication means.

  On the other hand, as shown in Patent Document 2, on the power source side or load side of a breaker equipped with an automatic closing device, a lightning arrester (also referred to as an arrester or SPD) is provided to protect load equipment from lightning surges. Is used. This lightning arrester protects the load equipment connected to the load side of the breaker by letting current flow into the ground through the lightning arrester when a lightning surge occurs.

  A varistor is often used for a lightning arrester. This varistor is composed of, for example, zinc oxide (ZnO) as a main component, and has a low resistance to a high voltage such as a lightning surge, but exhibits a high resistance to a low voltage below a certain level. It is an element which has. That is, when an abnormal voltage exceeding a certain level is generated by a lightning surge, the varistor becomes low resistance, a current flows in the varistor, and the lightning surge is instantaneously released into the ground. When the abnormal voltage disappears, the varistor becomes high and low again, and becomes insulative.

  By the way, the varistor deteriorates when energized by a lightning surge. In other words, a varistor that exhibits a high resistance for a low voltage below a certain level is energized at a voltage lower than the reference, and there is a risk of leakage current. Thus, when the lightning arrester is deteriorated, it does not play a role as a lightning arrester. Therefore, it is necessary to replace the lightning arrester and the parts constituting the lightning arrester, and to notify the outside of the lightning arrester deterioration.

  Therefore, as shown in Patent Document 3, there is a lightning arrester deterioration diagnosis system that notifies the outside of the lightning arrester deterioration. However, in order to realize this lightning arrester deterioration diagnosis system, there is a problem that it is necessary to separately provide a transmission means, a network, and a reception means, which is costly.

Therefore, there has been a demand for the development of a product that can be provided at a low cost and that can inform the outside of the lightning arrester deterioration or failure.
JP-A-8-335434 Japanese Patent Laid-Open No. 10-14092 JP 2002-340971 A

  To provide an automatic launching device that can inform the outside of the lightning arrester deterioration and failure at low cost.

  The present invention made in order to solve the above-mentioned problems is a breaker, an automatic thrower that automatically re-inserts the breaker, and a transmission unit that transmits a re-insertion abnormality signal to the outside when re-insertion is stopped. In the breaker automatic loading device provided with the above, the lightning arrester abnormality information detected by the abnormality detecting means for detecting at least one of the information on deterioration and failure of the lightning arrester connected to the power supply side or load side of the breaker is externally transmitted by the transmission means. It is characterized by transmitting.

  The abnormality detection means is a current detection sensor that detects a current flowing from the lightning arrester into the ground, and counts the number of operations of the lightning arrester detected by the current detection sensor. It is preferable to judge that.

  Alternatively, the abnormality detection means is a sensor that detects an energization current of the operation indicator lamp of the lightning arrester, and the transmission means preferably determines that the lightning arrester has failed when the energization current is not energized. .

  The present invention relates to a breaker, an automatic insertion device that automatically performs re-introduction of the breaker, and a breaker automatic insertion device that includes a transmission unit that transmits a re-introduction abnormality signal to the outside when re-introduction is stopped. Since the lightning arrester abnormality information detected by the abnormality detecting means for detecting at least one information of deterioration and failure of the lightning arrester connected to the power source side or the load side of the breaker is transmitted to the outside by the transmission means, It is not necessary to periodically monitor the deterioration of the lightning arrester installed in the plant, and it is only necessary to replace the parts that make up the lightning arrester or the lightning arrester, including when the lightning arrester abnormality information is transmitted. It becomes.

  Further, it is possible to transmit the lightning arrester abnormality information by the transmission means provided in the automatic insertion device, and there is an advantage that it is not necessary to provide a separate transmission means and the cost is not increased. Also, since the lightning arrester abnormality information and the re-input abnormality signal are transmitted by the same transmission means, it is possible to communicate with a common address even when monitoring via a network, such as a network, a communication program, etc. The burden of is not increased.

  As an abnormality detection means, a current detection sensor that detects the current flowing from the lightning arrester to the ground is provided, and the number of operations of the lightning arrester detected by this current detection sensor is counted. If it does, it will become possible to judge deterioration of a lightning arrester reliably and easily. For this reason, it becomes possible to notify the outside of the lightning arrester before the lightning arrester stops functioning.

  As an abnormality detection means, a sensor that detects the current flowing through the lightning arrester operation indicator lamp is provided, and when it is determined that the lightning arrester is faulty when the current is not supplied, it is determined that the lightning arrester is faulty. It becomes possible to do.

  By using the alarm output of a lightning arrester with alarm output as an abnormality detection means, it is possible to send the lightning arrester abnormality information to the outside using an existing lightning arrester with alarm output, and without automatic operation with a lightning arrester. A charging device can be provided.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram of an automatic input device showing an embodiment (first embodiment) of the present invention. This automatic throwing device is mainly composed of a breaker 1 and an automatic thrower 2, and a lightning arrester 3 is connected to the power source side of the breaker 1.

  The breaker 1 is mainly composed of a breaking mechanism part 1a, a power supply side terminal 1b, and a load side terminal 1c. The breaking mechanism part 1a includes an overcurrent tripping device and an instantaneous tripping device (not shown) in addition to a movable contact. Etc. In the breaker 1, when an overcurrent or a leakage occurs, the breaking mechanism 1a cuts off the electric circuit between the power supply side terminal 1b and the load side terminal 1c (trip state), and protects the load device 20 from overcurrent. Or, to prevent the occurrence of electric leakage accidents, a lightning surge may cause a trip state. The breaker 1 is provided with a handle (not shown). After removing the cause of the interruption, the handle is operated to close the electric circuit to electrically connect the power supply side terminal 1b and the load side terminal 1c. It can be connected (ON state) and turned on again.

  The automatic feeder 2 mainly includes a power supply unit 2a, a control unit 2b, a solenoid 2c, and an arm 2d. The power supply unit 2a is electrically connected to the power supply side terminal 1b and the control unit 2b, and supplies a current to the control unit 2b. The arm 2d can mechanically turn on the handle of the breaker 1 and is driven by a solenoid 2c. In addition, in order to protect the power supply part 2a and the control part 2b from overcurrent, it is preferable to provide the fuse 2j in the electric circuit between the power supply part 2a and the power supply side terminal 1b.

  Reference numeral 2e denotes an input unit of the control unit 2b, which is connected to the load side terminal 1c and detects the voltage on the load side of the breaker 1. If there is no output, it is determined that the shut-off mechanism 1a is in a trip state, the solenoid 2c is activated, the arm 2d is moved, the handle is moved to the ON position, and the power is automatically turned on again.

  When the shut-off mechanism 1a is activated due to a temporary cause such as a lightning surge, the cause can often be removed after a certain period of time has elapsed, so that it can be turned on again without any trouble. However, when the cause of interruption is due to electric leakage, the cause has not been removed even after a certain period of time. In this case, even if the automatic thrower 2 is turned on again, the shut-off mechanism 1a immediately operates to cut off the electric circuit, and the subsequent recharging is stopped. That is, when the interruption mechanism unit 1a operates and cuts off the electric circuit within a set time (for example, within 5 seconds) after the power is turned on again, the control unit 2b does not solve the abnormality of the electric circuit or the like. And control to stop the re-input operation.

  In addition, when the overcurrent of the load device has not been eliminated even though the power is turned on again, the cause is also caused when the shut-off mechanism unit 1a operates again after a set time elapses and the power is turned on again. Since it has not been removed, when a predetermined number of times (for example, 5 times in 30 minutes) is exceeded within a predetermined time, the control unit 2b determines that an abnormality such as an electric circuit has not been resolved, and stops the recharging operation. Control that.

  When the re-insertion as described above is stopped, the re-input abnormality signal is output to the outside (for example, the monitoring center 25) from the output unit 2f provided in the control unit 2b. This re-input abnormality signal is, for example, a step signal or a pulse signal. Note that a communication unit may be provided in the control unit 2b so that a re-injection abnormality signal is transmitted as a message and output from the output unit 2f. At this time, the power-on error signal indicates that the shut-off mechanism unit 1a operates within the set time after the power is turned on again, and the power is turned on after a certain period of time. In this case, it is possible to distinguish whether the re-injection is repeated when the re-injection is repeated and the re-injection is repeated within a predetermined time.

  The re-input abnormality signal output to the outside of the automatic input device is sent to the outside of the monitoring center 25 or the like through a dedicated line or a general-purpose line. When outputting a re-input abnormality signal as a message, network communication such as the Internet, wireless LAN, or the like may be used. By such a transmission means for outputting a re-loading abnormality signal to the outside, it becomes possible to grasp the operating state of the automatic charging device at the monitoring center 25 or the like remotely from the automatic charging device. Note that the transmission means for outputting the re-input abnormality signal to the outside may simply be such that a lead wire is drawn out from the output unit 2f and a lamp or the like is lit.

  Further, when re-insertion is stopped, the display unit connected to the control unit 2b is in a trip state because the shut-off mechanism unit 1a operates within a set time after the re-input, and the re-input is stopped. Displays “H”. In addition, when the re-input is repeated after a certain time has elapsed, the re-input is repeated. When the re-input is stopped within a predetermined time and the re-input is stopped, “P” is displayed.

  A lightning arrester 3 is connected to the power supply side of the automatic closing device as described above. The lightning arrester 3 mainly includes a fuse 3a, a varistor 3b, and a discharger 3c. The two fuses 3a are electrically connected to the two-pole power supply side terminals 1b, respectively, and the two varistors 3b are electrically connected to the two fuses 3a, respectively. One discharger 3c is electrically connected to two varistors 3b. The side opposite to the side connected to the varistor 3 b of the discharger 3 c is grounded by the ground wire 11.

  The varistor 3b is made of, for example, zinc oxide (ZnO) as a main component, and has a low resistance against a certain high voltage such as a surge voltage, but has a high resistance to a low voltage below a certain voltage. It is an element having linear current-voltage characteristics. When a lightning surge or the like occurs and an abnormal voltage of a certain level or more is applied to the varistor, the varistor 3b has a low resistance, and a current flows in the varistor 3b.

  Further, when a lightning surge or the like passes through the varistor 3b and a voltage of a certain level or more is applied to the discharger 3c, the discharge occurs in the discharger 3c, and a current flows in the ground. When a current flows through the discharger 3c, a continuation is generated even after the voltage applied to the discharger 3c becomes below a certain level. However, the varistor 3b has a high resistance and the continuity is interrupted. In addition, the discharger 3c of this embodiment is a gas enclosure type electric tube.

  With such a structure of the lightning arrester 3, when a lightning surge or the like occurs and a voltage of a certain level or more is applied to the power supply side terminal 1b, a current flows through the varistor 3b or the discharger 3c in the lightning arrester 3 and The load device 20 is protected by releasing the current.

  When the lightning surge passes through the lightning arrester 3, the varistor 3b is deteriorated, the current-voltage characteristics are deteriorated, and the continuity is not easily interrupted. Further, when the deterioration of the varistor 3b proceeds, the power supply side terminals 1b are short-circuited. For this reason, the fuse 3a is provided between the varistor 3b and the power supply side terminal 1b to prevent a short circuit between the power supply side terminals. Furthermore, the discharger 3c also deteriorates due to the lightning surge, and the insulation properties deteriorate.

  In the first embodiment, the ground wire 11 of the lightning arrester 3 penetrates the CT 15 and is grounded. This CT15 is connected to the input unit 2e of the automatic input device 2 and receives the secondary output of CT15. When a current flows from the lightning arrester 3 to the ground wire 11 due to a lightning surge or the like, the CT 15 detects the current and inputs it to the control unit 2b, and the control unit 2b counts the number of operations of the lightning arrester 3. The control unit 2b determines that the lightning arrester 3 has “degraded” when the input by the CT 15 exceeds a predetermined value and exceeds a predetermined number of times (for example, several hundred amperes is 5 times). As described above, since the CT 15 for detecting the current flowing through the ground wire 11 is provided as the abnormality detecting means for detecting the deterioration of the lightning arrester, the deterioration of the lightning arrester 3 can be reliably and easily determined.

  When the lightning arrester 3 is determined to be “deteriorated” as described above, the lightning arrester abnormality information is output to the outside from the output unit 2f. As described above, in the present invention, since the lightning arrester abnormality information is transmitted to the outside by the transmission means for transmitting the re-input abnormality signal of the automatic thrower 2 to the outside, it is not necessary to provide a separate transmission means, and the cost is high. It will never be. In addition, when transmitting the lightning arrester abnormality information and the re-input abnormality signal through separate transmission means via a network, it is necessary to assign addresses to each, and the burden on the network, communication program, etc. increases. Then, since the lightning arrester abnormality information and the re-input abnormality signal are transmitted by the same transmission means, it is possible to communicate with a common address, and the burden on the network, communication program, etc. does not increase.

  Only information on the current flowing from the lightning arrester 3 to the ground wire 11 due to a lightning surge or the like is transmitted to the monitoring center 25 or the like by the transmission means, and the number of operations of the lightning arrester 3 is counted by the monitoring center 25 or the like to determine “deterioration”. It is good to do.

  As described above, since the lightning arrester abnormality information and the information on the current flowing through the ground wire 11 are transmitted to the monitoring center 25 or the like, the “deterioration” of the lightning arrester 3 is informed to the outside before the lightning arrester 3 stops functioning. The parts constituting the lightning arrester 3 such as the varistor 3b or the lightning arrester 3 can be exchanged. In addition, it is not necessary to regularly monitor the lightning arrester 3 of the automatic charging device provided in a remote place, and personnel costs can be greatly reduced.

  FIG. 2 shows a second embodiment. An operation indicator lamp 3d and a resistor 3e are connected in series so as to connect between the one fuse 3a and the varistor 3b and between the other fuse 3a and the varistor 3a. The operation display lamp 3d is a light emitting diode in this embodiment. The resistor 3e is set to a high resistance value so that a weak current always flows between the fuse 3a and the varistor 3b and between the other fuse 3a and the varistor 3a, and the always-on display lamp 3d emits light. However, as described above, when the varistor 3b deteriorates and the resistance value decreases, the fuse 3a is blown to prevent a short circuit. Further, if the lightning surge exceeds the rating of the lightning arrester 3, the fuse 3a is blown even if the lightning arrester 3 is not deteriorated. When the fuse 3a is thus blown out, the operation display lamp 3d is turned off, and the failure of the lightning arrester 3 is notified to the outside.

  In the second embodiment, CT16 is provided so that the electric circuit between the fuse 3a and the power supply side terminal 1b penetrates CT16. This CT16 is connected to the input unit 2e and receives the secondary output of CT16. This CT 16 detects a weak current flowing in the electric path of one power supply side terminal 1b-one fuse 3a-operation display lamp 3d-resistance 3e-the other fuse 3a-the other power supply side terminal 1b. The CT 16 only needs to detect the weak current flowing in the electric circuit. Therefore, the CT 16 may be provided between the electric circuit in which the weak current flows, such as between the fuse 3a and the operation display lamp 3d. It does not matter.

  When the fuse 3a is blown and the electric circuit is not energized, the control unit 2b detects that the electric circuit is de-energized by CT16, and the control unit 2b " As described above, since the CT 16 for detecting the weak current is provided as the abnormality detecting means for detecting the failure of the lightning arrester, conventionally, it has been difficult to determine the failure of the lightning arrester 3 due to the melting of the fuse 3a. However, it is possible to reliably determine the failure of the lightning arrester 3. The control unit 2b is a transmission unit that transmits the above-described re-insertion abnormality signal to the outside, and transmits the lightning arrester abnormality information to the outside (such as the monitoring center 25).

  FIG. 3 shows a third embodiment. In this embodiment, the lightning arrester 3 provided with the existing alarm output unit 3f is used. The alarm output unit 3f is for outputting deterioration information or failure information of the lightning arrester 3 to the outside. In the present embodiment, the alarm output unit 3f is connected to the input unit 2e, and the lightning arrester abnormality information is sent to the control unit 2b.

  When the deterioration information or the failure information of the lightning arrester 3 is output from the alarm output unit 3f, the control unit 3b is a transmission unit that transmits the above-described re-introduction abnormality signal to the outside, and transmits the lightning arrester abnormality information to the outside (such as the monitoring center 25). ). The lightning arrester abnormality information may be transmitted to the outside and the lightning arrester abnormality information may be displayed on the display unit 2g provided in the automatic thrower 2. Thus, the alarm output of the existing lightning arrester with alarm output may be used as an abnormality detection means for detecting the deterioration of the lightning arrester 3.

  The lightning arrester 3 according to the embodiment includes the varistor 3b and the discharger 3c. However, the present invention is not limited to such an embodiment, and the present invention can be applied to a lightning arrester composed of a single varistor. The varistor 3b is not limited to zinc oxide (ZnO), and may be silicon carbide (SiC) or the like. Further, the lightning arrester 3 may be connected to the load side terminal 1 c of the breaker 1.

  In addition, it is good also as what can detect both deterioration and failure of the lightning arrester 3 combining 1st Embodiment and 2nd Embodiment.

  Although the present invention has been described above in connection with the most practical and preferred embodiments at the present time, the present invention is not limited to the embodiments disclosed herein. The invention can be changed as appropriate without departing from the spirit or concept of the invention that can be read from the claims and the entire specification, and an automatic loading apparatus with such a change should also be understood as being included in the technical scope. I must.

1 is a circuit diagram showing a first embodiment. FIG. It is a circuit diagram which shows 2nd Embodiment. It is a circuit diagram which shows 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Breaker 1a Interrupting mechanism part 1b Power supply side terminal 1c Load side terminal 2 Automatic feeder 2a Power supply part 2b Control part 2c Solenoid 2d Arm 2e Input part 2f Output part 2g Display part 2j Fuse 3 Lightning arrester 3a Fuse 3b Varistor 3c Discharger 3d Operation Indicator lamp 3e Resistance 3f Alarm output section 5 Power supply side terminal 11 Ground wire 15 CT
16 CT
20 Loaded equipment 25 Monitoring center

Claims (3)

  In a breaker automatic loading device equipped with a breaker, an automatic loading device for automatically re-loading the breaker, and a transmission means for transmitting a re-loading abnormality signal to the outside when the re-loading is stopped, the breaker power supply A lightning arrester abnormality information detected by an abnormality detection means for detecting at least one of deterioration and failure information of a lightning arrester connected to the load side or the load side is transmitted to the outside by the transmission means.   The abnormality detection means is a current detection sensor that detects the current flowing from the lightning arrester into the ground, counts the number of operations of the lightning arrester detected by this current detection sensor, and determines that the surge arrester has deteriorated more than the predetermined number of operations. The automatic charging device according to claim 1, wherein   The abnormality detection means is a sensor for detecting an energization current of an operation indicator lamp of the lightning arrester, and the transmission means determines that the lightning arrester is faulty when the energization current is not energized. Or the automatic injection | throwing-in apparatus in any one of Claim 2.

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