JP2543993B2 - Light core break detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to series lighting in which lights are connected to the secondary sides of a large number of transformers connected in series to a constant current type AC power source. The present invention relates to a circuit, and more particularly to a lamp burnout detecting device that detects burnout of a lamp based on an output current waveform and an output voltage waveform of an AC power supply.

(Prior Art) A series lighting circuit of this kind is used for lighting a runway at an airport. FIG. 5 shows a conventional device for detecting the disconnection of the lamp in the series lighting circuit.

In FIG. 5, the constant current power supply device 2 connected to the AC power supply 1 supplies a constant current to the series lighting circuit 6 by phase control. This series lighting circuit 6 includes insulation current transformers CT ₁ , CT ₂ , ..., CT _n whose primary sides are connected in series, and lights L ₁ , L respectively connected to the secondary sides of these insulation current transformers. ₂ ,…, L
It consists of _n and. This keeps the brightness of each light constant. The disconnection of such a light is detected by the disconnection detection unit 5.

The core disconnection detection unit 5 detects core disconnection based on the output current of the constant current power supply device 2 detected by the current transformer 3 for an instrument and the output voltage of the constant current power supply device 2 detected by the transformer 4. However, for the detailed configuration and operation,
Since it is disclosed in Japanese Patent Laid-Open No. 61-15556, only its schematic operation will be described here.

When one or more of the lights L ₁ , L ₂ , ..., L _n are disconnected, the secondary side of the insulation current transformer to which the lights are connected becomes open, and The output voltage waveform and the output current waveform change as shown in FIG. 6 due to the change in the load impedance as seen from the constant current power supply device 2 which supplies the current.

That is, when the secondary side of the insulation current transformer is opened, a magnetic saturation phenomenon is accompanied, so that the output current I ₀ of the constant current power supply device 2 slowly rises until the insulation current transformer is magnetically saturated, and core disconnection occurs. The waveform has a rising delay compared to when it is not. On the other hand, the output voltage V ₀ has a waveform that rises rapidly while the rising of the output current I ₀ is delayed (saturation time α). At this time, the time integrated value of the voltage value corresponding to the area of the hatched portion is proportional to the number of broken lights. Then, the disconnection detection unit 5 obtains this time integrated value and determines the time integrated value when one lamp is disconnected as m1, and if the value is m3, it is determined that the number of disconnection is three. .

(Problems to be Solved by the Invention) In the above-described conventional lamp core breakage detection device, it is possible to detect the occurrence of core breakage and the number thereof, but
It was not possible to determine which of L ₁ , L ₂ , ..., L _n was disconnected. For this reason, when the disconnection is detected, the runway of the airport must be patrol-checked to find the broken lamp, which causes a problem of inefficient maintenance and inspection.

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

The present invention has been made to solve the above problems, and a lamp burnout detecting device capable of detecting not only the fact that a burnout has occurred and the number thereof but also which fire burned out. Aim to get.

[Structure of Invention]

(Means for Solving the Problem) The present invention provides a disconnection of a lamp connected to the secondary side of a large number of transformers connected in series to a constant current type AC power source,
In a lamp burnout detection device that detects based on an output current waveform and an output voltage waveform of the AC power supply, a circuit open detection unit that detects that the secondary side is in an open state for each of the transformers, and an open state. It is detected that the secondary side of the transformer is short-circuited, short-circuit means for releasing the short-circuit for a fixed time at the short-circuit release time assigned to each lamp, and from the rising time of the output voltage waveform of the AC power supply. Time integral value calculating means for calculating a time integral value of the output voltage value of the AC power supply until the rising time of the output current waveform, and detecting that a state in which the calculated time integral value exceeds a predetermined value has continued for a predetermined time. Waveform change time determining means for generating a lamp disconnection signal, and which one of the lamps is generated depending on which lamp the time at which the lamp disconnection signal was generated occurred at the short circuit release time There is characterized in that a cross-sectional core position determination means for determining whether the Dancing.

(Operation) In the present invention, when the secondary side of the transformer is opened due to the disconnection of the lamp, the secondary side of the transformer is short-circuited and the short-circuit release time assigned to each lamp is kept for a certain time. While releasing the short circuit, the time integrated value of the output voltage value of the AC power supply from the rising time of the output voltage waveform of the AC power supply to the rising time of the output voltage waveform is calculated, and the disconnection of the lamp is determined from this time integrated value. A lamp disconnection signal is generated and the lamp disconnection signal is detected depending on which lamp the short circuit release time assigned to this lamp disconnection signal occurs, so that the lamp disconnection occurs. It is possible to detect not only the facts and the number thereof but also which of the lights has broken the core.

(Embodiment) FIG. 1 shows an embodiment of the present invention. The same elements as those in FIG. 5 are designated by the same reference numerals and the description thereof will be omitted. When compared with FIG. 5, the disconnection detection unit 5 is removed, and instead the time integration value calculation unit 11 and the waveform change time determination unit 1 are replaced.
2, a point in which a cross-sectional core position determination unit 13 and a clock unit 14, lamplight L _1, L _2, ..., respectively L _n terminal unit R _1, R _2, ..., a point obtained by adding the R _n and the conventional Different from the device.

Of these, the time integration value calculation unit 11 calculates the time integration value of the output voltage in the same manner as the conventional disconnection detection unit 5. The waveform change time determination unit 12 detects that the state in which the calculated time integral value exceeds the predetermined value is repeated a predetermined number of times and generates a lamp burnout signal. The disconnection position determination unit 13 determines which of the disconnected lights is based on the lamp disconnection signal of the waveform change time determination unit 12 and the time data of the clock unit 8.

On the other hand, the terminal units R ₁ , R ₂ , ..., R _n have the same configuration. Of these, the terminal unit R ₁ will be described as an example with reference to FIG.

On the secondary side of the insulation current transformer CT ₁ , an overvoltage detection unit 21 as a circuit open detection unit and a short circuit unit 22 are connected so as to be in parallel with the lamp L ₁ , respectively, and further, a short circuit is made. The clock unit 23 is connected to the unit 22. Among these, the overvoltage detection unit 21 detects that the secondary side voltage of the insulating current transformer CT ₁ has risen when the lamp L ₁ is disconnected, and generates an overvoltage signal. During addition, short-circuit unit 22, and a thyristor section 22a which shorts the secondary side of the insulating current transformer CT _1, as well as short-circuit the thyristor portion 22a overvoltage signal of the overvoltage detector 21, a short-circuit release instruction is given , Short circuit control unit to release the short circuit
22b and the time data of the clock unit 23, the short-circuit control unit for a fixed time at the short-circuit release time assigned to the lamp L _1.
It is configured by a short circuit release time setting unit 22c that gives a short circuit release command to 22b.

The short-circuit release time setting unit 22c is set with a time at which this short-circuit is released when a disconnection is detected and short-circuited, and this time is set by the terminal units R ₁ , R ₂ , ..., R _n . It is set not to overlap.

The operation of this embodiment configured as described above will be described below.

First, when the lamp L ₁ is disconnected, a high voltage is generated on the secondary side of the insulating current transformer CT ₁ . The overvoltage detection unit 21 detects this high voltage, and notifies the short circuit control unit 22b of this. The overvoltage detection unit 21 has a high impedance so that an overcurrent does not flow in.

Next, the notified short circuit control unit 22b changes the thyristor unit 22a.
Is turned on to short-circuit the secondary side of the insulating current transformer CT ₁ .

At this time, the short-circuit release time setting unit 22c compares the short-circuit release time internally set with the time data of the clock unit 23,
Short-circuit control unit 22b for a certain period of time from when both match
A short-circuit release command is given to. Short circuit control unit 22b releases during, shorting of the insulating current transformer CT ₁ by turning off the thyristor portion 22a short release command is given. This short circuit release time t ₀ is set to be the same for each terminal unit R ₁ , R ₂ , ..., R _n , but the start time of the short circuit release is for each terminal unit R ₁ , R
_2, ..., the values were different from each other for each _{R n t 1, t 2,} ..., t n is set.

On the other hand, as described above, the time integration value calculation unit 11 determines, based on the output signal of the instrument current transformer 3 and the output signal of the transformer 4,
The rising time of the output voltage waveform of the constant current power supply 2 and the rising time of the AC current waveform are respectively detected, and the time integration of the output voltage of the constant current power supply 2 from the rising time of the output voltage waveform to the rising time of the output current waveform is detected. Calculate the value.

The waveform change time determination unit 12 confirms that the time integration value exceeds a predetermined value, and that the time integration value in the short-circuited state is changed a plurality of times to confirm the disconnection detection signal. appear.

Further, the disconnection position determination unit 13 determines which of a large number of lights has disconnected the core based on the generation time of the disconnection detection signal of the waveform change time determination unit 12 and the time data of the clock unit 14.

FIG. 3 is a time chart showing these relationships.
In the figure, the short circuit release time setting unit 22c of the terminal unit R ₁ is set with the short circuit release time t _{1, and} the short circuit release time setting units of the other terminal units R ₂ , R ₃ , ..., R _n (not shown). The short circuit release times t ₂ , t ₃ , ..., T _n , which are sequentially shifted by T ₁ hours, are set in (d). Then, the time t ₁ to t ₂ is the short-circuit allocation section of the terminal unit R ₁ , the time t ₂ to t ₃ is the short-circuit allocation section of the terminal unit R ₂ ,
... from the time t _n to t _{n + 1} has become a short-circuit deallocated section of the terminal part R _n.

Now, if the thyristor portion 22a is turned on immediately after the lamp L ₁ is disconnected, it is the same as the state without disconnection, so the output voltage waveform and the output current waveform of the constant current power supply 2 rise at almost the same time. Moreover, there is little waveform distortion. Then, at time t _{1, the} short-circuit release time setting unit 22c gives a short-circuit release command to the short-circuit control unit 22b for t ₀ time, and when the thyristor unit 22a is turned off in response to this, disconnection occurs and the state is changed. Since this corresponds to the case of being left unattended, the output voltage waveform of the constant current power supply 2 shows a steep rise as shown in the period A of FIG. The integral value also increases. Then time
When t ₀ elapses and the thyristor portion 22a is turned on again, the output voltage waveform of the constant current power supply device 2 becomes the same as the state without disconnection as shown in the period B of FIG. 3 (a). Also,
The short circuit release time setting unit 22c of the terminal unit R ₁ gives a short circuit release command to the short circuit control unit 22b every time the time T ₀ elapses. The waveform change time determination unit 12 takes in the time integration value of the time integration value calculation unit 11 and detects that the time integration value of the period B becomes smaller than the time integration value of the period A, which is repeated a plurality of times. Generates a lamp burnout signal. Further, the cross-sectional core position determination unit 13, when the lighting sectional core signal in short release period of FIG. 3 _{(b) (t 1 ~t 2} ) is generated, it is determined that the cross-sectional center of the lamp L _1.

On the other hand, as with the terminal unit R ₂ to R _n also this corresponding to lights L ₂ ~L _n, each of the insulating current transformer CT ₂ to CT _n when the cross-sectional core of the lamp L ₂ to LT _n occurs respectively In addition to short-circuiting the secondary side, in each short-circuit release allocation section, the operation to release the short-circuit for t ₀ time is executed multiple times, and the waveform change time determination unit 12 disconnects the core based on the output of the time integral value calculation unit 11. Is detected, the disconnection position determination unit 13 determines the position.

Thus, according to this embodiment, since it is possible to accurately determine which of the lights has become coreless, it is not necessary to travel the runway to find the coreless lamp,
The efficiency of maintenance work can be greatly improved.
In addition, even if the core is broken, the secondary side of the insulation current transformer is released from the short circuit for a relatively short time t _{0 at} every constant period T ₀ , but the high voltage causes the insulation current Since it can be prevented from occurring on the secondary side of the container, it is possible to prevent a short circuit between windings and a burnout due to a temperature rise.

Next, other examples will be described. This is a modification of the configuration contents of the terminal units R ₁ , R ₂ , R ₃ , ..., R _n (FIG. 2) of the above-described embodiment, and is shown as the terminal unit RR _{1 in} FIG. In the terminal portion R _{1 of} FIG. 2, the occurrence of disconnection is detected by detecting the overvoltage generated on the secondary side of the insulating current transformer CT ₁ by the overvoltage detection portion 21. On the other hand, in this terminal unit RR ₁ , the lamp current disconnection detection unit 25 connected in series to the lamp L ₁ detects that the current flowing in the lamp L ₁ is cut off due to the occurrence of core disconnection. The difference is what you do. Except for detecting the occurrence of core disconnection in this manner, the other configuration is exactly the same as that of the above-described embodiment.

It should be noted that all of the above-described embodiments are merely examples, and the lamp burnout detecting device of the present invention is not limited. For example, although an insulating current transformer is used as a transformer, it can also be applied to a series lighting circuit using a transformer, and as a short-circuit for the secondary side of such a transformer,
Although a thyristor is used in the embodiment, it may be short-circuited by other means such as opening and closing its contacts using a relay. Further, in the above embodiment, the disconnection detection unit for each light, the terminal unit having the short-circuit unit and the clock unit is provided, but unlike this, one having these functions is provided in one place, and each of the Disconnection detection and short circuit may be performed.

〔The invention's effect〕

As described above, the lamp burnout detection device of the present invention includes:
If either lamp burns out, the secondary side of the transformer will be short-circuited,
Furthermore, this short circuit is released for a certain time at different times for each lamp, and the time when the voltage waveform of the constant current power supply changes,
Since it determines which assigned short-circuit cancellation allocation section and detects the position of the lamp that has been burned out, not only the fact that the burnout occurred and the number of that burned out, but which lamp burned out The effect is that it can also be detected.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention,
FIG. 2 is a block diagram showing the detailed configuration of the main elements of the embodiment, FIG. 3 is a time chart for explaining the operation of the embodiment, and FIG. 4 is a detailed view of the main elements of the other embodiment. FIG. 5 is a block diagram showing a configuration, FIG. 5 is a block diagram showing a configuration of a conventional lamp core detection device, and FIG. 6 is a voltage and current waveform diagram for explaining the operation of the device. 2 ... Constant current power supply device, 3,24 ... Current transformer for instrument, 4 ...
Transformer, 6 ... Series lighting circuit, 11 ... Time integral value calculation unit, 12 ... Waveform change time determination unit, 13 ... Disconnection position determination unit, 14,23 ... Clock unit, 21 ... Overvoltage detection Section, 22 ... Short circuit section, 22a ... Thyristor section, 22b ... Short circuit control section, 22c
...... Short circuit release time setting part, 25 ...... Light current disconnection detection part, CT
₁ 〜 CT _n …… Insulation current transformer, L ₁ 〜 L _n …… Light, R ₁ 〜 R _n , RR ₁ …
… Terminal.

Claims (1)

(57) [Claims] 1. A disconnection of a lamp connected to a secondary side of a large number of transformers connected in series to a constant current type AC power source is detected based on an output current waveform and an output voltage waveform of the AC power source. In the lamp core disconnection detection device, circuit open detection means for detecting that the secondary side is in an open state for each of the transformers and the secondary side of the transformer in which the open state is detected are short-circuited. Together with short-circuiting means for releasing the short-circuit for a fixed time at the short-circuit release time assigned to each lamp,
Time integral value calculating means for calculating a time integral value of the output voltage value of the AC power source from the rising time point of the output voltage waveform of the AC power supply to the rising time point of the output current waveform, and the calculated time integration value is a predetermined value. Depending on the waveform change time determination means that detects that the state exceeding exceeds a predetermined time and generates a lamp disconnection signal, and which lamp the occurrence time of the lamp disconnection signal occurs at the short circuit release time assigned to which lamp And a core disconnection position determination means for determining which one of the lights has core disconnection.