JPH04115494A - Detection device for burnt-out filament in lamp - Google Patents

Abstract

PURPOSE:To improve reliability by carrying out judgment of burnt-out filament in a lamp when the number of times of event that the time from the time point when the A.C. power supply output is stopped instantaneously to the time point of detection operation of output change detection means is in correspondence with the judgment time set at every lighting-up operation is counted over specified times. CONSTITUTION:When a lamp L1 is burnt-out in its filament, output fluctuation of a constant current power supply device 2 is detected by a burnt-out filament generation judgment part 6 and the output is sent to a short circuit release operation count part 10. A secondary side over-voltage of an insulation transformer CT1 is detected by an over-voltage detection part 21 of a terminal part R1 and the detection signal is output to a short-circuit control part 23. Then, the short circuit control part 23 controls a thyrister part 22 to make the secondary side of the transformer CT1 short-circuited. When a power supply control part 8 stops the output of a device 2 instantaneously, a current interruption detection part 25 detects it to output the signal to the control part 23 and release the short circuit CT1 of the transformer at every specified time. After that, a judgment part 6 detects the change in output voltage of the device 2 for judging generation of burnt-out filament and outputting the signal to a count part 10. When the count value is over a specified value, a burnt-out filament position judgment 9 judges generation of burnt-out filament of lamp L1.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a lamp for detecting a break in each lamp connected to the secondary side of a plurality of insulating transformers connected in series. The present invention relates to a core breakage detection device.

(Prior Art) A series light lighting circuit is generally used to light a large number of lights used for approach guidance of an airport runway. This series lamp lighting circuit is provided with a lamp breakage detection device that detects when one of the plurality of lamps is broken.

FIG. 6 is a block diagram showing the configuration of the conventional lamp breakage detection device described above.

In FIG. 6, the constant current power supply device 2 supplies a constant current output to the series lighting circuit 66 by controlling the phase of the power supplied from the AC power supply 1. The series lighting circuit 66 includes isolation transformers CT and CT whose negative sides are connected in series.
2. ..., CTo, and these isolation transformers CT
CT2. ...1'' Lights L1, L2゜ connected to the secondary side of CT respectively
. . . Controls the lighting of L. Light, L2. ...L
are output from the constant current power supply device 2, respectively, and are output from the isolation transformer CT1. CT2. ..., CT, so that the brightness is maintained constant by the current supplied through the CT.

The core breakage detection unit 65 detects the above-mentioned light L1. L2.

..., disconnect the core of L in instrument current transformer 3 and instrument transformer 4.
It is detected from changes in electrical signals input through.

Here, the process of detecting a core break in a light by the core break detection unit 65 will be described. The light L1 illustrated in FIG. L
2. ..., Lo is disconnected, the secondary side of the insulation transformer to which the disconnected lamp is connected becomes open. When the secondary side of the isolation transformer becomes open, the load impedance seen from the constant current power supply device 2 that is supplying current to the disconnected lamp changes. As the load impedance seen from the constant current power supply device 2 changes in this way, the output voltage waveform and output current waveform of the constant current power supply device 2 become as shown in FIG. 7. The principle of pressure testing for the core breakage of the lamp in this case is described, for example, in Japanese Patent Publication No. 15556/1983.

When the secondary side of the isolation transformer becomes open due to the breakage of the light, a magnetic saturation phenomenon occurs, and the output current of the constant current power supply t2 rises slowly until the isolation transformer reaches magnetic saturation. This results in a waveform that rises later than when there is no core breakage in the light. On the other hand, the output voltage of the constant current power supply 2 has a waveform that rises steeply while the rise of the output current is delayed (saturation time α, α is also the phase control angle). As is clear from FIG. 8, the time integral value of the voltage waveform m i r m 2 , . proportional to the number. Here, the time integral value when one light is broken is expressed in ml, so if the time integral value determined by the broken core detection section 65 is m3, the number of broken lights is It turns out that there are 3 pieces.

(Problems to be Solved by the Invention) By the way, the conventional lamp breakage detection device having the above-mentioned configuration has the following problems:
Although it is possible to detect the occurrence of core breakage in the light and the number of lights in which core breakage has occurred, it is possible to detect the occurrence of core breakage in the light L1. L2. ...
, Ln, it is not possible to detect or determine where the core breakage has occurred.

Therefore, the core breakage detection unit 65 detects that the light L1. L2
．． ..., If a breakage is detected in one of the lights, workers must patrol the airport runway to find the broken light, reducing the efficiency of maintenance and inspection work. The problem is that it is bad.

Additionally, if there is a delay in replacing a broken light, the secondary side of the isolation transformer to which the broken light is connected will be left open for a long time, resulting in high costs. There are also problems in that short-circuit accidents occur between the windings due to the voltage and burnout of the windings due to temperature rise.

Therefore, in order to solve the above-mentioned problems, the applicant of the present application has proposed a method for detecting not only the number of broken light bulbs, but also the location of the broken light bulbs. Various proposals were made regarding detection devices. One of the above proposals is related to, for example, Japanese Patent Application No. 1-335292. The outline of the proposal is as follows. That is, a terminal section is provided corresponding to each light, and the time for determining whether the light is broken or not is set for each terminal section, and the time for determining whether or not the light is broken is set differently for each light, and the AC power output or the main station side is set. The time from the time when the provided AC power supply control means is controlled to the time when the open operation determining means provided on the master station side detects a change in the AC power output is counted. Along with this, each determination time is made to correspond to each counting time, the corresponding counting time is determined among these determination times, and the light corresponding to this determined determination time is determined to be a broken-core light. .

However, even in a device configured in this way,
For example, after the AC power supply momentarily stops, a determination time t1 corresponding to the light L1 has elapsed, a determination time t2 corresponding to the light L2 has elapsed, and a determination time t corresponding to the next light L3 has elapsed.
3 (t 1 < t 2 < t 3...
*) If the light L2 is broken, the master station cannot detect that the light L2 is broken because the determination time t2 has already elapsed. In addition, the breakage of the above-mentioned light is performed by the short-circuit release operation on the secondary side of the transformer performed by the short-circuit control section of the terminal section corresponding to the broken light when the master station side is determining the breakage of each light. are different and do not occur at fixed times. Therefore, for example, when the light L3 is already broken and the short-circuit control unit corresponding to the light L3 is performing a short-circuit release operation after the judgment time of the light L3 has elapsed, the light L2 happens to be broken. In the worst case, the waveform overlaps with the output waveform of the AC power supply due to the short-circuit release operation, and there is a risk that not only the break in the light L but also the break in the light L3 cannot be detected. There is also. Furthermore, in the above case, if the light L is not broken, there is a risk that a broken light may be mistakenly detected as the light L3 is broken even though the light L2 is broken. .

Therefore, an object of the present invention is to detect a new core breakage in any one of the lights when the core breakage determination time of each light is being performed using the core breakage determination time set to a different length for each light. A highly reliable light core break detection device that can accurately and reliably detect a light core break even when a light core break occurs, and does not cause problems such as false detection when determining the core break of other lights. It is about providing.

[Structure of the invention]

(Means for solving the problem) In order to achieve the above object, the present invention has a light lighting circuit on the secondary side of two or more transformers connected in series to a constant current type AC power source. A light breakage detection device for a series lighting circuit includes a breakage detection means provided for each light to detect the occurrence of a break in the corresponding light, and a breakage detection means for detecting the occurrence of a break in the corresponding light, and an output of the AC power source for a period of time that does not interfere with the lighting of each light. an alternating current power supply control means for instantaneously stopping the power supply; and an alternating current power supply control means provided for each light to short-circuit the secondary side of the corresponding transformer upon detection of the occurrence of core breakage;
and short-circuit control means that releases the short-circuit state multiple times at scheduled determination times set for each light from the instantaneous stop of the AC power output; an output change detection means for detecting a change in the output of the AC power supply caused by a side opening phenomenon, and a count of the number of times that the time from the instantaneous stop point to the detection operation point of the output change detection means coincides with any of the judgment times. a counting means for determining the number of times counted by the counting means, when the number of times counted by the counting means exceeds a preset number reference value, determining that the lamp is broken, for which a judgment time related to the number of times counted is set; The present invention is configured to include a wick light determination means.

(Function) In the above configuration, the core breakage detection means is provided for each light, and detects the occurrence of core breakage in the corresponding light, and the AC power supply control means detects the occurrence of core breakage in the corresponding light, and the AC power supply control means detects the occurrence of core breakage in each light. The output of the AC power source is instantaneously stopped, and a short-circuit control means is provided for each light, and short-circuits the secondary side of the corresponding transformer upon detection of the occurrence of core breakage, and also controls the short-circuit state. is made to be canceled multiple times at each scheduled determination time set for each lamp from the instantaneous stop of the AC power output.

Further, the output change detection means receives the AC power output and detects a change in the AC power output caused by an open phenomenon on the secondary side of the transformer, and the counting means calculates the output change of the output change detection means from the instantaneous stop point. The broken-core lamp determining means counts the number of times that the time up to the detection operation time coincides with any of the above judgment times, and when the number of times counted by the counting means exceeds a preset number reference value, Since we have decided to judge the light whose core has been broken for which the judgment time related to the number of times that has been counted has been set, we have determined that each light is broken using the breakage judgment time that is set to a different length for each light. Even if a new break occurs in one of the lights during core breakage determination, it is possible to accurately and reliably detect the core break in that light, and also to detect the core breakage in other lights. It is now possible to provide a highly reliable light core breakage detection device that does not cause problems such as false detection.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

As is clear from the above description, the light breakage detection device according to the present invention is generally applied to a series light lighting circuit for lighting a large number of lights used for approach guidance of an airport runway. Then, it is detected that any one of the many lights is broken.

FIG. 1 is a block diagram showing the configuration of a lamp breakage detection device according to an embodiment of the present invention.

In FIG. 1, a constant current type AC power source, for example, a constant current power supply device 2, controls the phase of the power supplied from an AC power source 1 to output a constant current to a series lighting circuit 5.
supply to. The series lighting circuit 5 is an isolation transformer CT whose negative side is connected in series.

CT 2 , . . . , CTo, and these isolation transformers CT, CT2 . ..., lights L1 . . . connected to the secondary side of CTn, respectively. L2. ..., L.

Control the lighting. Light L1. L2. . . , Lo are output from the constant current power supply device 2, and are connected to the isolation transformers CT,
CT2. ..., the brightness is maintained constant by the current supplied through CTo.

Each of the lights L1. L2. ..., Ln are provided with terminal portions R1, R2, ..., Rn, respectively. Terminal part R
, R2, . . . , Rn each have the same internal configuration, and the internal configuration is as shown in FIG. Each of the above-mentioned terminal units R,, R2, .
. . , Rn will be explained in detail later using FIG. 2.

The device shown in FIG. 1 further includes the constant current power supply device 2.
A master station 7 that detects the output from the constant current power supply device 2 and controls the constant current power supply device 2 is connected to the output side of the constant current power supply device 2 . The master station 7 includes an output change detection means such as a breakage occurrence judgment section 6, an AC power supply control means such as a power supply control section 8, a broken light judgment means such as a breakage position judgment section 9, and a counting means such as a short-circuit release operation counting section. It is equipped with 10.

The breakage occurrence determining section 6 is connected to the instrument current transformer 3 and the instrument transformer 4, respectively. The core breakage occurrence determination unit 6 detects the light L1. L2. . . . It is determined whether or not core breakage has occurred in any of L. This determination result is output to the core breakage position determining section 9. The disconnection occurrence determination section 6 also determines when the short circuit on the secondary side of any of the transformers is released for a certain period of time, and transmits this determination result to the power supply control section 8.
and is output to the short-circuit release operation counting section 10.

A power supply control section 8 in the master station 7 receives outputs from the core breakage occurrence determining section 6 and the core breakage position determining section 9, and controls the output of the constant current power supply device 2. The power supply control unit 8, under the control of the core breakage position determination unit 9, controls the lights Li, L2,
. . . Regardless of whether there is a light with a core break in Lo, at regular intervals (for example, 10 minutes or several minutes less), the The output is momentarily stopped for a short period of time equivalent to one cycle (hereinafter referred to as "instantaneous stop"). The short-circuit release operation counting unit 10 controls all the lights L1, L2, . ...,
Each lamp L1. L2.
..., a core breakage judgment time that differs for each Ln (that is, a time to determine whether or not a light has a core breakage.Hereinafter referred to as "judgment time")
remember. For example, if the above-mentioned plurality of cycles is m, the short-circuit release operation counting unit 10
The determination time t2 corresponds to the light L2, and the determination time t2□ corresponds to the light L2.

Judgment time t corresponds to . 1 (here, 1<1<...tnl).

In addition, in the second cycle, a determination time t is stored in association with the lamp L1, a determination time t2° is stored in correspondence with the lamp L2, and a determination time tn2 is similarly stored in correspondence with the lamp Ln. (here, t12<1<...
...It is Kutn2). Further, in the m-th period, the determination time t is set to correspond to the light L1, and the determination time t2IIIG, 1 m is set to correspond to the light L.
2 In the same way, the judgment time t is set corresponding to the light L, and n

nm (here, tIII<t2I
l<...kut). The short-circuit release operation counting unit 10 also counts all the lights (Ll, L2..., L
The waveform of the output signal from the disconnection occurrence determination unit 6 when the breakage determination unit 6 is normal, and the short-circuit release operation of the isolation transformer secondary side of the short-circuit control unit 23 (shown in FIG. 2) at each terminal unit. , or each light L1. L2. ..., Ln (hereinafter, the waveform of the output signal from the breakage determination unit 6 due to the breakage occurring in any one of the isolation transformers CT1゜Cr2..., CTo) It also stores reference data for identifying the output waveform (accompanying output waveform). The short-circuit release operation counting section 10 detects an open phenomenon (
(including the short-circuit release operation by the short-circuit control unit 23 of each terminal part), it is recognized that the short-circuit release operation of the corresponding short-circuit control unit 23 was performed due to the breakage of one of the lights. and +1 to the corresponding light.
count.

Then, for each cycle, data that allows identification of which light is the one for which +1 has been counted is outputted to the breakage position determining section 9.

The breakage position determining section 9 includes the short-circuit release operation counting section 10.
It receives the count value (+1) output from each cycle and adds this value for each lamp.

Then, at the end of a plurality of cycles set with the instantaneous stop point as a reference point, this added value is compared with a pre-stored count reference value for determining a broken wick, and the count is greater than or equal to this count reference value. A light with an added value is determined to be a broken light. The disconnection position determining unit 9 further determines the short-circuit release operation counting unit 1 at the end of the plurality of cycles.
When it is determined that there is a light whose count addition value output from 0 is less than the count reference value for the broken-core light determination,
A drive command signal is output to the power supply control section 8. Then, by instantaneously stopping the output of the constant current power supply device 2 again, the above-described core breakage determination is performed again over a plurality of cycles.

Note that the plurality of determination times, which are different for each light mentioned above, will be described in detail later.

FIG. 2 shows each terminal portion R1, illustrated in FIG. 1,
It is a block diagram showing the internal configuration of terminal unit R1 among R2, . . . , Rn. As described above, the internal configurations of the terminal units R1, R2, . . . , Ro are the same, so for convenience of explanation, only the internal configuration of the terminal unit R1 is illustrated.

In FIG. 2, on the secondary side of the isolation transformer CT L, there are disconnection detection means, for example, an overvoltage detection section 21, and short circuit control means, for example, a short circuit section 27, in parallel with the above-mentioned light L1. are connected. Further, a current interruption detection section 25 is connected to the secondary side of the isolation transformer CT1 through a current transformer 26. This current interruption detection section 25 is connected to the short circuit control section 23 of the short circuit section 27 . The overvoltage detection section 21 is configured to detect a high voltage generated on the secondary side of the isolation transformer CT1 due to the disconnection of the light L1 and output it to the short circuit control section 23 through the delay circuit 31. It has become. The overvoltage detection section 21 is set to have a high impedance so that no current flows from the secondary side of the isolation transformer CT1. The delay circuit 31 delays the output signal from the overvoltage detection section 21 by several cycles, and then outputs the signal to the short circuit control section 23 . The short circuit section 27 includes the aforementioned short circuit control section 23 and the thyristor section 2.
2 and a time setting section 24. Under the control of the short-circuit control section 23, the silisk section 22 short-circuits the secondary side of the insulation transformer CT1 when a core break occurs in the lamp L1.

The current disconnection detection unit 25 detects an instantaneous stop of the constant current power supply device 2 by the power supply control unit 8 after the secondary side of the insulation transformer CT1 is short-circuited by the thyristor unit 22 due to the occurrence of core breakage in the light L1. It becomes possible. When the current interruption detection section 25 detects the instantaneous stop through the current transformer 26, it outputs a predetermined detection signal to the short circuit control section 23. The time setting section 24 sets the timing at which the short circuit control section 23 causes the thyrisk section 22 to release the short circuit.

That is, as described above, the time setting unit 24 has the determination time t1□"1 corresponding to each of the plurality of periods m set with reference to the instantaneous stop point of the output of the constant current power supply device 2.
2'...tl, is set (here, tl,
is the determination time set corresponding to the first cycle,
tl. is the judgment time set corresponding to the second period, and similarly, t is the judgment I11 constant time set corresponding to the m-th period. Therefore, naturally it becomes tll×tl2×...kut). Note that, in the time setting unit m24 of the terminal unit R2, determination times t21"22'...t2IIl are set corresponding to each of the plurality of periods m (here, t2 is the first period t2□ is the determination time set corresponding to the second cycle, and similarly, t2Il is the determination time set corresponding to the m-th cycle. Therefore, it is natural that j 21 < t 22 <...< t2 Note) In addition, the time setting section 24 of the terminal R has a determination time tnl corresponding to each of the plurality of periods m. 't...
・t is set (here, tnl is n2'
r+n is the determination time set corresponding to the first cycle, tn
2 is a determination time set corresponding to the second cycle, and similarly, t is a determination time set corresponding to the m-th cycle ff1 period. Therefore, naturally t. 1<tn2<...kut. Note). Short circuit control section 2
3 receives a signal output from the overvoltage detection section 21 through the delay circuit 31 and controls the thyristor section 22 . That is, the short circuit control section 23 connects the overvoltage detection section 21 to the delay circuit 3.
When it is determined that the lamp L1 is broken based on the signal outputted through the insulating transformer CT1, the thyristor section 22 is controlled to short-circuit the secondary side of the isolation transformer CT1. When the short circuit control unit 23 detects a signal indicating that the instantaneous stop has been detected from the current interruption detection unit 25 due to the short circuit, the short circuit control unit 23 sets the time point at which the signal indicating that the instantaneous stop has been detected as a reference time point. , determination time t11 set by the time setting unit 24
By controlling the thyristor section 22 every time ``l., ..., tl.'' elapses, during a certain cycle T1,
The short circuit is configured to be released.

Next, the operation of the lamp breakage detection device having the above-described configuration will be explained. First, when the light L1 is broken, the output of the constant current power supply device 2 changes accordingly, and this output fluctuation is detected by the breakage occurrence determining section 6 and output to the short-circuit release operation counting section 10. On the other hand, due to the disconnection, the secondary side of the isolation transformer CT1 becomes almost open, and an overvoltage occurs. The overvoltage detection section 21 of the terminal portion R1 detects this overvoltage and outputs a detection signal to the short circuit control section 23 indicating that an overvoltage has occurred.

When the short-circuit control unit 23 receives the detection signal, it short-circuits the secondary side of the isolation transformer CT i by controlling the thyristor unit 22, thereby determining whether the light L1 is broken or not. It will be in a state where it is not detected.

On the other hand, when the constant current power supply 2 is instantaneously stopped by the power supply control section 8 in the manner described above, the output current from the constant current power supply 2 (the 3(a)) and the output voltage (FIG. 3(b)) become O. When the power supply control section 8 momentarily stops the output of the constant current power supply device 2, the current interruption detection section 25 provided in the terminal section R1 detects the momentary stop of the output and outputs it to the short circuit control section 23. . Upon receiving the output, the short-circuit control unit 23 sets the time of receiving this output as a reference time,
Judgment time t1□”1 set by the time setting unit 24
2'...tl, the thyristor unit 22 is controlled to release the short circuit for a time T as shown in FIG. 3(d). The reason why the short circuit is canceled after the instantaneous stop is to synchronize the timing at which counting of time t, which differs for each lamp, is started with the timing at which one cycle of the waveform starts. When the short circuit is released in this way, the output voltage waveform (Fig. 3(b)
)), the core breakage occurrence determination section 6 detects this change using the above-described time integration method, determines that a core breakage has occurred, and notifies the short-circuit release operation counting section 10. In this case, the notification that the core breakage has occurred is delayed by the saturation time α from the start time of the short-circuit release time.

To explain further, the short-circuit release operation counting section 10 of the master station 7
After the determination time t11 (including the saturation time α) has elapsed from the instantaneous stop, the short-circuit control unit 23 of one of the terminals detects a signal indicating that the short-circuit has been released. When the signal is output from the section 6, after subtracting the saturation time α from the output point of the signal, it is determined that the short-circuit release operation is performed by the short-circuit control section 23 corresponding to the light L1, and the light L is
1 and notifies the disconnection position determination unit 9 that the light L1 has been counted +1.

Further, after the judgment time t1° has elapsed from the moment of instantaneous stop, when a signal indicating that the short-circuit release operation has been performed is output from the breakage occurrence judgment unit 6, +1 is counted in the lamp L1 and the breakage is interrupted. The center position determination unit 9 is notified. Similarly, after the determination time t11Il has elapsed from the instantaneous stop, when a signal indicating that the short-circuit release operation has been performed is output from the core breakage determination section 6, the light L1 is increased by +1.
is counted and notified to the breakage position determining section 9. At the end of a plurality of cycles from the moment of instantaneous stop, the broken core position determination unit 9 compares the count addition value of the light L1 with the reference value for the above-mentioned broken core light determination, and determines whether the count addition value is a broken core light. When it is equal to or greater than the reference value for determination, it is determined that a core break has occurred in the light L1.

Next, if the light L2 is broken, the insulation transformer CT
The secondary side of 2 becomes almost open and an overvoltage occurs.

At this time, in the same manner as described above, the core breakage occurrence determining section 6 detects the core breakage of the lamp and outputs it to the short-circuit release operation counting section 10. On the other hand, the overvoltage detection section 21 of the terminal section R2 detects this overvoltage and outputs a detection signal indicating that an overvoltage has occurred to the short circuit control section 23.

When the short-circuit control unit 23 receives the detection signal, it short-circuits the secondary side of the insulation transformer CT2 by controlling the si-risk unit 22, whereby the breakage of the lamp L2 is detected by the breakage occurrence determining unit 6. It will be in a state where it is not.

On the other hand, when the constant current power supply 2 is instantaneously stopped by the power supply control section 8 in the manner described above, the output current from the constant current power supply 2 (the 3(a)) and the output voltage (FIG. 3(b)) become zero. When the power supply control section 8 momentarily stops the output of the constant current power supply device 2, the current interruption detection section 25 provided in the terminal section R2 detects the momentary stop of the output and outputs it to the short circuit control section 23. . When the short circuit control unit 23 receives the output, the short circuit control unit 23 sets the time point at which the output is received as a reference starting point,
Judgment time t21” set by the time setting unit 24
22'..., t2. Thyristor section 2
2 to release the short circuit for a time T as shown in FIG. 3(d). The reason why the short circuit is canceled after the instantaneous stop is to synchronize the timing at which counting of the time t, which differs for each lamp, is started with the timing at which the waveform of one cycle of a1 starts. When the short circuit is released in this way, the lamp L2
Since a change occurs in the output voltage waveform (FIG. 3(b)) due to core breakage, the core breakage occurrence determination unit 6 detects this change using the above-mentioned time integration method, etc., determines that a core breakage has occurred, and detects a short circuit. Notification is made to the release operation counting unit 10. In this case, the notification that the core breakage has occurred is delayed by the saturation time α from the start time of the short-circuit release time.

The short-circuit release operation counting unit 10 calculates the determination times t2□, t2 using the point in time when the power supply control unit 8 instantaneously stops the output of the constant current power supply 2 as a reference point in the same manner as described above.
゜,..."Every time 2m elapses, a signal indicating short-circuit release operation is output from the core breakage determination unit 6, and this is sent to the light L.
2 is counted as +1, and the broken core position determination unit 9 is notified. When the core breakage position determining unit 9 recognizes that the count addition value is equal to or greater than the reference value for determining a core-broken lamp, it determines that the light L2 is core-broken. Here, the above judgment time t
21"22'..., the length of t21M is (tll
” 12'...-,tl,)+T×Tx (However, Tx
is shown in FIG. 3(c), and the core breakage occurrence determination unit 6
(which is the return time of ). This prevents the respective times T for canceling the short circuit from overlapping even if breakage occurs at multiple locations.

Therefore, the time corresponding to the light L (t31"32' ・
...t) is (t31"32'..." 3m)
〉(t21'II t22"・-, tz,) 10T+Tx, the time (tnl"n2' ... tnl) corresponding to the light Ln is (t
nL"n2''°°・t)> (tn-11
・n-12・ . -1゜nl
...t)+T0T. By setting each judgment time t in this way, even if breakage occurs at multiple locations, it is possible to accurately identify the broken light at the terminal parts R1 to Ro of each light. It is necessary to adjust the respective times T for releasing the short circuit so that they do not overlap.

Next, the detection operation of the lamp breakage detecting device will be described using as an example a case where the lamp L 1 and the lamp L2 are broken at the same time. If a core break occurs in the lamps L and L2 at the same time, the secondary sides of the isolation transformers CT and Cr2 will be in a state close to open, and an overvoltage will occur.

At this time, in the same manner as described above, the core breakage occurrence determining section 6 detects the core breakage of these two lamps and outputs it to the short-circuit release operation counting section 10. On the other hand, this overvoltage
1 and the overvoltage detection section 21 provided at the terminal section R2, the isolation transformers CT1. The secondary side of Cr2 is connected to short-circuit portions 27 provided separately at terminal portions R1 and R2.
shorted by. Then, the determination time t11''21''L□, tz is set with the point in time when the power supply control unit 8 instantaneously stops the output of the constant current power supply device 2 as a reference point in time. .

..., t1n+" Every time 2m elapses, a signal indicating an open phenomenon on the secondary side of the isolation transformer, that is, terminal portion R1°R2
When a signal indicating a short-circuit release operation by the short-circuit control unit 23 is output from the core breakage occurrence determining unit 6, the short-circuit release operation counting unit 10 counts the lights L1 and L2 by +1 each time, and determines the position of the core breakage. Notify Department 9. When the core breakage position determination unit 9 recognizes that each count addition value is equal to or greater than the reference value for core breakage determination, the core breakage position determination unit 9 determines the light L1. It is determined that L2 is broken.

For example, the plurality of periods m is set to 3, and the determination time (tll''12't) for the light L1,
Judgment time for light L2 (t2□).

tz. ``23), if a signal indicating an open phenomenon on the secondary side of the isolation transformer corresponding to each of these judgment times is output from the breakage occurrence judgment section 6, the short-circuit release operation counting section 10 The count addition value for each lamp L1°R2 is 3.The core breakage position determination unit 9 makes a final judgment as to whether or not the core of the light L2 is broken based on the count addition value. Become. Here, if the reference value for determining a broken-core lamp is 3, the broken-core position determining unit 9 determines that the light L1L2 is a broken-core lamp. Other lights L3, L4'...
, L is less than or equal to 2, these other lights L3. L4. ..., Lo is determined to have no core breakage.

Next, the core breakage position determination unit 9 detects each light L1. L2. ..., when determining the disconnection of Lo, if any of the lights is disconnected and the secondary side of the corresponding insulation transformer becomes open, the secondary side of this insulation transformer will be opened. Changes in the output of the constant current power supply device 2 due to the state are detected by the breakage occurrence determining section 6.

Naturally, a break in a light does not occur at a fixed time, so it occurs regardless of the determination time determined for the light in which the break occurs. Therefore, in the worst case, if a break occurs in the above-mentioned light in response to the determination time of another normal light, not only will it be impossible to detect which light is the broken-out light, but it will also be impossible to detect whether the above-mentioned light is broken or not. Assuming that a break has occurred in a light that does not have a core broken, the short-circuit release counting unit 10 calculates +1 for this light that is not broken.
There is a risk that it will be counted.

Therefore, in order to prevent the occurrence of such a malfunction, the core breakage position determining section 9 calculates each lamp L1. L2. By comparing the count addition value for each L with the reference value for determining a broken-core light, it is determined which light is the broken-core light, and the short-circuit release operation counting unit 10 While counting the output from the core breakage occurrence determination unit 6 for each light due to the open phenomenon of the secondary side, a new light with a core breakage is also detected. For example, when there is a light whose value counted by the short-circuit release operation counting unit 10 is +1 after the above-mentioned multiple cycles,
In order to perform the core breakage determination operation for the plurality of cycles again, a control signal is output to the power supply control section 8 to instantaneously stop the output of the constant current power supply device 2. As a result, the above-mentioned plurality of cycles of the core breakage determination operation are executed again, and the added count value of the lamps that exceeded the count value in the previous core breakage determination becomes equal to or greater than the reference value for core breakage determination. It should be noted that if there is no core breakage in any of the above-mentioned lights, even if the power supply control section 8 performs control to instantaneously stop the output of the AC power, each isolation transformer CT.

Since the secondary side of ~CT is not shorted, no change occurs. In this way, if all the lights are normal, the short-circuit on the secondary side of the insulation transformers CT1 to CTo and the temporary release of this short-circuit are not performed, so the breakage occurrence determination unit 6 detects the corresponding insulation transformer. The change in the output of the constant current power supply device 2 caused by the temporary release of the short circuit on the secondary side of the device is not detected, and therefore the short circuit release operation counting unit 10 is not notified of the detection. Therefore, even if multiple cycles have passed, the added count value of the short-circuit release operation for each light is all less than the reference value (or O) for determining a broken light.
The core breakage position determination unit 9 determines that all the lights are normal.

As explained above, according to the light core breakage detection device according to the embodiment of the present invention, it is possible to accurately determine which light has a core breakage, so that a worker can discover a light with a core breakage. There is no need to patrol the runway for inspection.
The efficiency of maintenance and inspection work can be greatly improved.

In this case, if the cycle of instantaneous stopping of the output of the constant current power supply device 2 performed by the power supply control unit 8 is shortened, a broken lamp can be detected in a short time after the core breakage occurs.

In addition, each of the above-mentioned lights L1. L2. . . . Even if breakage occurs in Ln, the isolation transformer CT1°CT2,
. . , CT2., the secondary sides of the normal lamps are short-circuited to make the same condition as when no core breakage occurs, and the insulation transformers CT, CT2. . . . Since the secondary side of CT is released from the short circuit for a short time T1, the isolation transformers CT, CT2, . . . ..., generation of high voltage on the secondary side of CTn can be avoided. Therefore,
The isolation transformer CT1. CT2. ..., it is possible to prevent short circuits between windings in the CTo and burnout due to temperature rise.

Next, other embodiments according to the present invention will be described. Another embodiment according to the present invention includes the terminal portion R1 of the embodiment described above,
This is a modification of the configuration of R2, . In the terminal portion R1 shown in FIG. 2, an overvoltage detection section 21 is used as a core breakage detection means, and the overvoltage detection section 21 detects the overvoltage generated on the secondary side of the isolation transformer CT1. It was detected that a core break occurred in the light L1. On the other hand, in this terminal part RR1, when the current flowing through the lamp L1 is cut off due to the occurrence of a core break, the light current is passed through a current transformer 41 connected in series to the light L1, which is a means for detecting the occurrence of a core break. The difference is that the disconnection detection unit 42 detects that a core break has occurred in the lamp L1. The apparatus is completely similar to the lamp breakage detection device according to the embodiment described above, except that it detects that the light L1 has a breakage in this manner.

It should be noted that the above-mentioned embodiments are all examples according to the present invention, and do not mean that the lamp core breakage detection device according to the present invention is limited to the above two embodiments. For example, in the above two embodiments, a thyristor is used as a means for short-circuiting the secondary sides of the isolation transformers 6-2 to CTn, but other methods such as short-circuiting/opening by using relays and opening/closing their contacts are also possible. It is also possible to use means. Furthermore, it is not always necessary for the core breakage position determination unit 9 to automatically perform the core breakage position determination operation at regular intervals, and therefore it is necessary to frequently instantaneously stop the eight units of the constant current power supply device 2 by the power supply control unit 8. Not necessarily. For example, the operation for determining the breakage position may be performed several times every hour on the hour, and when the operator wants to detect a break in the light, the output may be instantaneously stopped by manual operation. There may be.

In the two embodiments described above, the power supply controller 8 performs the constant current power supply rI! , 2 is performed by setting both the output voltage and output current from the constant current power supply device 2 to 0. Generally, in the constant current power supply device 2, the power supply part for lighting the lamp is used. and a power supply section that flows a base current to obtain the time integral value when the core is broken, so it can be done by setting the output of the power supply section for lights to O, but not the output of the power supply section for Hose. good. In this case, the waveforms of the output voltage and output current during the instantaneous stop of output are as shown in FIG.

〔Effect of the invention〕

As explained above, according to the present invention, the number of times that the time from the instantaneous stop of the AC power supply output to the detection operation time of the output change detection means coincides with either the scheduled judgment time set for each lamp is determined. When the counted number of times exceeds the preset number of times reference value, the lamp is determined to have a broken core for the judgment time corresponding to the counted number of times. Even if a new core break occurs in any of the lights while the core breakage determination time for each light is being determined using the core breakage determination time set to a different length for each light, the corresponding light is It is possible to provide a highly reliable lamp core breakage detection device that can accurately and reliably detect core breakage in other lamps and does not cause problems such as erroneous detection when determining the core breakage of other lamps.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a lamp breakage detection device according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of the terminal part of the device, and FIG. 3 is a constant current in the device. FIG. 4 is a time chart showing changes in the output voltage and current waveform of the power supply device, a breakage detection signal from the breakage detection section, and a short circuit signal from the short circuit control section. FIG. 5 is a time chart showing changes in the output voltage and current waveform of a constant current power supply device according to another embodiment of the present invention, and FIG. 6 is a block diagram showing the configuration of a conventional lamp breakage detection device. , Fig. 7 is an explanatory diagram showing changes in the output voltage and current waveform of the constant current power supply due to the occurrence of core breakage, and Fig. 8 is an explanatory diagram showing the change in the output voltage of the constant current power supply and the number of broken lights. It is an explanatory diagram showing a relationship. 1... AC power supply, 2... Constant current power supply device, 3, 26
41...Current transformer, 4...Transformer, 5.66...Series lighting circuit, 65...Breakage detection section, 6...Breakage occurrence judgment section, 7...Main station , 8... power supply control section, 9...
Breaking position determination unit, 10... short circuit release operation counting unit,
21... Overvoltage detection section, 22... Thyristor section, 2
3... Short circuit control section, 24... Time setting section, 25...
- Current interruption detection unit, 27... Short circuit part, 31... Delay circuit, 42... Light current interruption detection unit, R1, R2, -, R
n...terminal section, LT1LT2. -, LTo...Light, CT1. CT2.・・・CT ・・・Isolation transformer.

Claims (1)

[Scope of Claims] In a light breakage detection device for a series lighting circuit, each of which has a light lighting circuit on the secondary side of two or more transformers connected in series to a constant current type AC power supply, an AC power source control means for instantaneously stopping the output of the AC power source for a time that does not interfere with the lighting of each light; the secondary side of the corresponding transformer is short-circuited by the detection of the occurrence of core breakage, and this short-circuit condition is canceled multiple times at each scheduled judgment time set for each light from the instantaneous stop of the output of the AC power source. short-circuit control means for inputting the AC power output and detecting a change in the AC power output caused by an open phenomenon on the secondary side of the transformer; and the output change detection means from the moment of instantaneous stop. a counting means for counting the number of times that the time up to the detection operation time coincides with any of the above judgment times; and when the number of times counted by the counting means exceeds a preset number reference value, this counting means 1. A light core breakage detection device comprising: a light core breakage detection device for determining a light core breakage in a light having a core breakage for which a determination time corresponding to the number of times the light has been detected is broken.