JP2633674B2 - Light core break detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention is applied to a circuit for lighting a plurality of lamps in series via an insulated current transformer. The present invention relates to a lamp burnout detecting device that detects whether there is a lamp.

(Prior Art) In general, a series lamp lighting circuit is used for runway lighting at an airport. In this circuit, there is a conventional apparatus shown in FIG. 5 for detecting the disconnection when the disconnection occurs in the lamp.

The current from the AC power supply 1 is input to the constant current power supply 2 and is supplied to the series lighting circuit 36 while being kept constant by phase control. As a result, the brightness of the lamps L1, L2,..., Ln connected to the secondary sides of the serially connected insulating current transformers CT1, CT2,. Such detection of the centering of the lamp is performed by the centering detector 35.

When one or more of the lights L1, ..., Ln is disconnected, the secondary side of the insulated current transformer to which the light is connected is open, and current is supplied to the light. The load impedance as seen from the constant current power supply 2 changes. Thus, the output voltage and output current of the constant current power supply device 2 are as shown in FIG. As a method of detecting the core breakage in this case, there is a method described in, for example, Japanese Patent Publication No. 61-15556.

That is, when the secondary side of the insulating current transformer is opened, a magnetic saturation phenomenon occurs, and the rising of the output current of the constant current power supply device 2 becomes slow until the insulating current transformer becomes magnetically saturated, and the disconnection occurs. The waveform has a delayed rising than when no wick is generated. On the other hand, the output voltage has a steep rising waveform while the rising of the output current is delayed (saturation time α). At this time, the time integral value of the voltage waveform, which corresponds to the area of the portion shown by hatching, is proportional to the number of lights that have been cut off as shown in FIG. Here, the time integration value when one lamp is disconnected is m1. Thus, the time integration value is obtained by the disconnection detecting unit 35, and if this value is m3, it is understood that the number of disconnections is three.

(Problems to be Solved by the Invention) However, in such a lamp burnout detecting device, the occurrence of burnout and the number of burnouts are detected.
It cannot be determined which of 1, L2, ..., Ln the lamp is. For this reason, when it is detected that the centering has occurred, it is necessary to make a patrol inspection of the runway of the airport to find the centering light, and there is a problem that the efficiency of the maintenance and inspection work is low.

In addition, if the replacement of the broken lamp is delayed, the insulation current transformer whose secondary side is open will be left for a long time, causing a short circuit between windings due to high voltage and burning due to temperature rise. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lamp burnout detection device that can detect which of a number of lights has burnt out.

[Configuration of the invention]

(Means for Solving the Problems) The present invention is provided for each lamp and detects a disconnection occurrence detecting unit that detects a disconnection of the corresponding lamp, and when the disconnection occurrence detecting unit detects the disconnection, A short-circuit control unit that short-circuits the secondary side of the transformer to which the decoupled lamp is connected, a short-circuit release unit that releases a short-circuit during a short-circuit release time set to a different value for each lamp, and a short-circuit release unit And a waveform change time measuring unit for measuring a change time of an output voltage waveform of the AC power supply, and a rising time point of an output voltage waveform of the AC power supply and a rising time point of an output current waveform of the AC power supply after occurrence of disconnection. Detects and integrates the output voltage from the rising point of the output voltage waveform to the rising point of the output current waveform with time to obtain a time integration value, and a time integration value calculation unit, and judges from the time integration value obtained by the time integration value calculation unit. The number of broken lights And a disconnection position determining unit that determines which lamp has disconnected from the result of the comparison between the waveform change time and the short-circuit release time set for each of the lights.

Here, the decentering detection unit may detect the occurrence of decentering by detecting an overvoltage generated in the transformer due to the decentering of the lamp. The occurrence of the disconnection may be detected by detecting the interruption of the flowing current. Further, the transformer may be a current transformer.

(Operation) When the disconnection is detected by the disconnection occurrence detection unit, the secondary side of the transformer is short-circuited by the short-circuit control unit, and the short-circuit is released by the short-circuit release unit for the short-circuit release time. The time when the output voltage waveform of the AC power supply changes due to the release of the short circuit is measured by the waveform change time measuring unit. Further, the time integral value of the output voltage is measured by the time integral value calculating section. The number of lights with a broken core is determined from the time integration value. Further, by comparing the waveform change time with the short-circuit release time set differently for each lamp, it is detected which lamp has been broken, and the broken core is detected. The position of the existing light is detected.

Here, the detection of the occurrence of the disconnection may be performed by detecting an overcurrent generated in the transformer due to the occurrence of the disconnection, and also detecting that the current flowing to the lamp is cut off by the occurrence of the disconnection. Can also be done. The same applies even when a current transformer is used as the transformer.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of a lamp burnout detecting device according to this embodiment. As described above, the current from the AC power supply 1 is input to the constant current power supply device 2 and is supplied to the serial lighting circuit 36 while being kept constant by the phase control. This allows
Insulated current transformers CT1, CT2, connected in series to the series lighting circuit 36
…, Lights L1, L2,…, Ln connected to the secondary side of CTn, respectively
Is maintained constant. Here, as compared with the related art, the point that the terminal units R1, R2,..., Rn are provided for each lamp, the time integration value calculating unit 5, the waveform change time measuring unit 6, and the disconnection The difference is that a center position determination unit 7 is provided.

The time integral value calculation unit 5 is provided with the above-described conventional disconnection detection unit 35.
Similarly, the time integral value of the output voltage is obtained. The waveform change time measuring unit 6 measures the time when the output voltage waveform changes, and such a change in the waveform is determined by the terminal units R1 and R2.
2,..., Caused by a short circuit performed by Rn.

The terminal units R1, R2,..., Rn have the same configuration, and the terminal unit R1 will be described as an example with reference to FIG. On the secondary side of the insulated current transformer CT1, an overvoltage detection unit 12 and an short-circuit unit that detect overvoltage so as to be in parallel with the lamp L1, respectively.
11 and are connected. The short-circuit unit 11 includes a thyristor unit 11c for short-circuiting the secondary side of the insulation current transformer CT1, a short-circuit release time setting unit 11a for setting a time for releasing the short-circuit, and a thyristor 11c for releasing the short-circuit for this time. And a short-circuit control unit 11b for controlling.

The operation of such a terminal unit R1 will be described. Light L1
When the core is disconnected, a high voltage is generated on the secondary side of the insulation current transformer CT1, and this is detected by the overvoltage detection unit 12. Here, the overvoltage detection unit 12 has a high impedance so that no current flows. When the overvoltage detector 12 detects a high voltage,
This is notified to the short-circuit control unit 11b.

The notified short-circuit control unit 11b drives the thyristor unit 11c to short-circuit. Then, the short circuit is released for the time set in the short circuit release time setting section 11a. The length of the short-circuit clearing time is different for each short-circuit clearing time setting unit 11 included in each of the terminal units R1, R2,.
1, t2, t3 are set. Here, the short-circuit on the secondary side of the insulation current transformer CT1 is released during this time t1 at regular intervals T.

When such a short circuit and its release occur, the output voltage waveform of the constant current power supply 2 changes as shown in FIG.
In the period T, the short-circuit is released during the period A, which corresponds to a case where the core is broken and the state is left as it is, so that the voltage waveform shows a steep rise as described above. The circuit is short-circuited during the period B, and is similar to the case where the core break does not occur when viewed from the output side of the constant current power supply device 2, so that the waveform is similar to the normal state as shown in the figure. The waveform change time measuring section 6 shown in FIG. 1 measures the time of the period A in which the waveform has changed via the instrument transformer 4 connected to the output side of the constant current power supply 2. This measurement is performed by using the time integral value of the output voltage during the period A obtained by the time integral value calculating section 5, and while this value exceeds a predetermined value, the period A is continued and the predetermined value is This is performed by determining that the process has shifted to the period B at the time when it does not exceed.

Next, based on the obtained waveform change measurement time and the time integration value, the centering position determining unit 7 determines which of the lamps is centered.

First, from the time integration value, the number of lights deficited is one, and the waveform change measurement time is as shown in FIG.
If the short-circuit release time t1 set by the short-circuit time setting unit 11 matches, it is determined that the lamp L1 has been disconnected.

The number of lights with the same core is the same, but if the second time coincides with the short-circuit release time t2 as shown in FIG. Become.

As shown in FIG. 3 (c), the waveform change measurement time
Similar to FIG. 3 (b), except that the number of cut lights is 2
If the number is the individual, the centering position is determined by the following determination. Since the change in the voltage waveform is observed only during the section BB during the cycle T, the lights L3, L4, L4, L4, L4, L3, L4, in which the short-circuit release times t3, t4, t5,.
It can be seen that no core breakage occurred in L5,..., Ln. Therefore, there are two short-circuit release times in the section A2, and it is clear that the lights L1 and L2 for which the short-circuit release times t1 and t2 are set are disconnected.

When two or more lights are successively disconnected, the following judgment is made. For example, as shown in FIG. 3, the short circuit release time t1 is 0.5 cycles, t2 is 1.5 cycles, and tn is (n
-1) +0.5 cycle. As a result, even when two lights L1 and L2 are successively disconnected, the length of the period A is two cycles, and it may be erroneously determined that another light such as the light L3 has been disconnected. Absent.

As described above, it is possible to accurately judge which light has become decentered.Therefore, there is no need to perform a round-trip inspection of the runway to find the defied light, and the efficiency of maintenance and inspection work has been reduced. It can be greatly improved. In addition, even if the core breaks, the secondary side of the insulation current transformer is short-circuited,
By releasing the short-circuit for a relatively short short-circuit release time at every fixed period T, it is possible to prevent a high voltage from being generated on the secondary side of the insulating current transformer for a long period of time. It is possible to prevent short-circuiting and burning due to temperature rise.

Next, other embodiments will be described. This is a modification of the configuration of the terminal units R1, R2,..., Rn (FIG. 2) in the above-described embodiment, and is shown as a terminal unit RR1 in FIG.
In the terminal unit R1 in FIG. 2, the occurrence of the disconnection is detected by detecting the overvoltage generated on the secondary side of the insulation current transformer CT1 by the overvoltage detection unit 12. On the other hand, in the terminal unit RR1, the fact that the current flowing through the lamp L1 was cut off due to the occurrence of the core disconnection was confirmed by the current transformer connected in series with the lamp L1.
The difference is that the lamp current cutoff detector 22 detects that the current is no longer detected from 23.
The other configuration is exactly the same as that of the above-described embodiment, except that the occurrence of the disconnection is detected in this manner.

It should be noted that each of the above-described embodiments is merely an example, and does not limit the apparatus for detecting a core disconnection of a lamp according to the present invention. For example,
Although an insulated current transformer is used as a transformer, the present invention can be applied to a series lighting circuit using a transformer, and as a short circuit of the secondary side of such a transformer, in the embodiment, Although a thyristor is used, it may be short-circuited by other means, such as by opening and closing its contacts using a relay. Further, in the embodiment, the terminal unit having the disconnection detection unit and the short-circuit unit is provided for each lamp,
Alternatively, a device having these functions may be provided in one place to detect the disconnection or short circuit of each lamp.

In addition, except for the rare case where two or more lights are consecutively or simultaneously de-centered, it is possible to detect the de-centered position without calculating the number of de-centered lights. No need to have.

〔The invention's effect〕

As described above, the lamp burnout detection device of the present invention includes:
If one of the lights becomes disconnected, the secondary side of the transformer will be short-circuited,
In addition, this short circuit is released for different times for each lamp, and the position of the broken lamp is detected by determining which short circuit release time matches the waveform change time during which the voltage waveform changes during the short circuit. Since the number of lights that have been decentered is determined based on the time integrated value of the output voltage after the decentering,
Even when multiple lights are disconnected at the same time, the position of these lights can be accurately specified, and there is no need to carry out patrol inspections etc. to find the disconnected lights. Efficiency can be improved, and a situation in which a high voltage is applied to the transformer for a long time due to disconnection can be avoided, and a short circuit between the windings and burning can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a lamp burnout detecting device according to an embodiment of the present invention, FIG. 2 is a block diagram showing a configuration of a terminal portion of the device, and FIG. 3 is a constant current power supply device in the device. FIG. 4 is a block diagram showing a configuration of a terminal part of a lamp burnout detecting device according to another embodiment, and FIG. 5 shows a configuration of a conventional lamp burnout detecting device. FIG. 6 is a block diagram, FIG. 6 is an explanatory diagram showing changes in the output voltage and current waveform of the constant current power supply device due to the occurrence of disconnection, and FIG. 7 is the time integrated value of the output voltage of the constant current power supply device and the number of disconnected lights. FIG. 4 is an explanatory diagram showing a relationship with the above. 1 ... AC power supply, 2 ... constant current power supply, 3,33 ... current transformer for instrument, 4,34 ... transformer, 5 ... time integral value calculation unit,
6: Waveform change time measuring section, 7: Decentering position determining section, 1
1,21 ... Terminal section, 11a, 21a ... Short circuit release time setting section, 11
b, 21b: Short-circuit control unit, 11c, 21c ... Thyristor unit, 12 ...
... Overvoltage detector, 22 ... Lighting current interruption detector, 23 ... Current transformer, 36 ... Series lighting circuit, R1, R2, ..., Rn ... Terminal LT1, L
T2, LTn, light.

Claims (4)

(57) [Claims] An apparatus for detecting a core breakage of a lamp in a series lighting circuit in which a lamp lighting circuit is provided on a secondary side of two or more transformers connected in series to a constant current type AC power supply. And a disconnection occurrence detection unit that detects disconnection of the corresponding lamp, and when the disconnection occurrence is detected by the disconnection occurrence detection unit, the secondary of the transformer connected to the disconnected light is connected. A short-circuit control unit that short-circuits a side, a short-circuit release unit that releases a short circuit during a short-circuit release time set to a different value for each lamp, and a change time of the output voltage waveform of the AC power supply accompanying the short-circuit release And a waveform change time measuring unit for measuring the rising time of the output voltage waveform of the AC power supply and the rising time of the output current waveform of the AC power supply after the occurrence of the disconnection, and the rising of the output voltage waveform. The output from the point A time integration value calculating unit for calculating a time integration value obtained by integrating the output voltage value with time up to the rising point of the flow waveform, a number of broken lights determined from the time integration value obtained by the time integration value calculation unit, and A disconnection position determining unit that determines which lamp has disconnected from a comparison result between the waveform change time measured by the waveform change time measuring unit and the short-circuit release time set for each lamp. Characteristic light core breakage detection device. 2. The system according to claim 1, wherein the disconnection detection section detects the disconnection by detecting an overvoltage generated in the transformer due to the disconnection of the lamp. The device for detecting a core disconnection of a lamp according to the above. 3. The disconnection occurrence detection section detects the disconnection by detecting that the current flowing through the lamp is cut off due to the disconnection of the lamp. The apparatus for detecting a core disconnection of a lamp according to claim 1. 4. The apparatus according to claim 1, wherein said transformer is a current transformer.