JPH02234395A - Broken filament detecting device for serial lighting circuit - Google Patents

Abstract

PURPOSE:To easily specify a broken-filament lamp and judge a continuously broken filament by detecting the output voltage and output current of a constant-current power source, closing and opening the contact between secondary winding terminals several times at the time set in response to the lamp number when a broken filament is detected, and judging the lamp number based on the signals. CONSTITUTION:Broken filament detecting slave machines R1-Rn which detect the output voltage and output current of a constant-current power source 2 for many transformers T1-Tn in which secondary windings are connected to lamps L1-Ln respectively and primary windings are connected in series, detect the broken filament of the lamp for each transformer, and close and open the contact between secondary winding terminals several times at the time set in response to the lamp number are provided. A broken filament detecting master machine 5 judging the lamp number of the lamp with a broken filament based on the output signals of voltage and current detecting sections is provided. Which lamp has a broken filament is judged, and whether the filament is continuously broken is easily judged.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention relates to a system in which the primary windings of a large number of transformers each having a lamp connected to its secondary winding are connected in series to a constant current power source. The present invention relates to connected series lighting circuits, and particularly to a breakage detection device that determines the lamp number of a broken lamp.

(Prior Art) This type of series lighting circuit is extremely effective in keeping the brightness of a large number of lamps constant, and is suitable, for example, for airport runway lamps. By the way, when a light lamp on an airport runway breaks, it is necessary to detect it and replace it with a new one, but it is difficult to manually detect this breakage, so it is difficult to manually detect the breakage, so it is necessary to The circuit is equipped with a unique break detection device.

FIG. 6 is a block diagram showing a schematic configuration of a conventional core breakage detection device together with a series lighting circuit. In the figure, the input side of a constant current power supply device 2 is connected to an AC power supply 1, and an isolation transformer T-1,
The primary windings T-2...T-n are connected in series, and the isolation transformers T-1...T-n are connected in series. Light lamps L-1, L-2...L-n are connected to each secondary winding of T-2...T-n, and these constitute a series lighting circuit. Then, based on the output signal of the instrument transformer 3 that detects the output voltage of the constant current power supply device 2 and the output signal of the current transformer 4 that detects the output current, the core breakage detection device 5a detects the light lamp L-1. ，
L-2... It is designed to detect core breakage of L-n.

Below, the schematic operation of the core breakage detection device 5a is shown in FIG. 7(a).
．． This will be explained using the waveform diagram in (b).

The constant current power supply device 2 has a power supply voltage V of the AC power supply 1.

A constant level of current is applied to the isolation transformer T-1,
T-2...Supplied to the series circuit of the T-n primary winding.

Assuming that none of the lamps L-1, L-2...L-n is broken, the voltage waveform v1 detected by the instrument transformer 3 as shown in FIG. and the current waveform I detected by the current transformer 4 is the power supply voltage waveform V, respectively. Both waveforms v1 and I
1 is in phase and has a shape close to a sine wave.

Now, when the light lamp L-2 in the series lighting circuit is disconnected, the secondary side of the isolation transformer T-2 becomes open, so the isolation transformer T-2 becomes magnetically saturated.

When such a magnetic saturation phenomenon occurs, as shown in FIG. 7(b), the voltage waveform Vl detected by the potential transformer 3
” is the distortion, the current waveform I detected by the current transformer 4
' has a shape in which the rise is delayed compared to the voltage waveform Vt-.

The core breakage detection device 5a detects the presence or absence of core breakage and the total number of lamps based on the degree of delay of the current waveform 11- with respect to the voltage waveform V1' or the integral value l of the voltage waveform v1- until the current waveform I' rises. The percentage of core breakage was detected.

(Problems to be Solved by the Invention) The conventional core breakage detection device 5a described above has a constant current power supply device 2.
Since core breakage was detected only based on the voltage and current waveforms detected on the output side, it was not possible to determine which lamp was broken or whether adjacent lamps were broken consecutively. There was a problem.

This invention was made in order to solve the above-mentioned problems, and provides a core breakage detection device that can determine which lamp has a core breakage, and can also easily determine whether or not the core breakage is continuous. The purpose is to

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a series lighting circuit in which the primary windings of a large number of transformers each having a lamp connected to its secondary winding are connected in series to a constant current power supply. A voltage and current detection unit for detecting the output voltage and output current of the power supply, and a voltage and current detection unit provided for each of the transformers, each detecting a break in the light lamp, and a set corresponding to the lamp number at the time of core break detection. A core break detection slave device that shorts and opens the secondary winding terminals multiple times over time, and a core break detector that determines the lamp unit number of the broken light lamp based on the output signals of the voltage and current detection section. The device is characterized by being equipped with a detection master device.

(Function) In this invention, when the core break detection slave unit detects a core break in the lamp, the secondary winding terminals are short-circuited and opened multiple times at a set time corresponding to the lamp number. However, since the core detection unit determines the number of the broken light lamp based on the output voltage and output current of the constant current power supply, it is possible to determine which light lamp is broken. can be determined, and it is also easy to determine whether or not there is continuous core breakage.

(Embodiment) FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, and in the figure, the same reference numerals as in FIG. 6 indicate the same elements. Here, in addition to being equipped with a core break detection base unit 5 that detects core break and determines which lamp has broken, it also has a display unit 9 that displays the determination results, and a display unit 9 that is exposed on the side of the runway 10. Light lamps L-1, L-2...L-n
The core breakage is detected in each case, and the insulation transformers T-1 and T- are connected to each other.
2...Breakage detection slave unit R-1, R-2...R-n that short-circuits and opens the secondary winding terminals of T-n multiple times.
It is equipped with

Of these, the core disconnection detection master device 5 includes a core breakage detection unit 6 that detects a core breakage based on each output signal of the instrument transformer 3 and the current transformer 4 as voltage and current detection units, and It is comprised of a breakage position determination unit 7 that determines the number of the lamp in which the lamp is broken when detected, and a transmission unit 8 that transmits the determination result to the display unit 9.

Further, as shown in detail in FIG. 2, the core disconnection detector R-n is connected in parallel to the auxiliary current transformer 11 for detecting the current of the lamp L-n and the lamp L-n. The thyristor unit 12 short-circuits and opens the terminals of the insulation transformer T-n secondary winding, and the lighting lamp L based on the output of the auxiliary current transformer 11.
-n core breakage detection unit 13 that detects core breakage, lamp unit number setting unit 14 that sets the lamp unit number, and signal sending that sets the on-state time of the thyristor unit 12 according to the set lamp unit number. When the time setting section 15, the reset time setting section 16 that sets the off-state time, and the breakage detection section 13 detect a breakage, the thyristor section 12 is turned on for the time set by the signal sending time setting section 15. and a control section 17 that turns off the thyristor section 12 for the time set by the reset time setting section 16.

The operation of this embodiment configured as described above will be explained below with reference to the time charts of FIGS. 3 to 5.

First, when the lamp L-n is broken, on the output side of the constant current power supply device 2, that is, in the series lighting main circuit, the voltage waveform rises before the current waveform rises, and becomes a waveform with a bulge. In FIG. 3, v1 shows the voltage waveform of this series lighting main circuit, 2 shows its current waveform, and 12 shows the secondary current waveform of the isolation transformer T-nl over a long period of time.

Now, time t. 1, when the lamp lamp L-n is broken, the breakage detection unit 6 of the breakage detection master unit 5 detects the breakage based on the change in the voltage and current waveform of the series lighting circuit, and the breakage detection slave unit The core breakage detection unit 13 of R-n detects core breakage when the secondary current of the isolation transformer T-n becomes zero. and,
In the core breakage detecting subunit R1n, the time t when a predetermined time has elapsed. 2, the control unit 17 controls the signal sending time setting unit 15.
The thyristor section 12 is kept in the on state until time t03 when the time t set by the reset time setting section 16 has elapsed, and the thyristor section 12 is kept off until the time to4 when the time T set by the reset time setting section 16 has elapsed. Repeats on and off control.

In this way, from time t02 to time t03, and from time t to time t. 5, from time t06 to time t. Up to 7, when the secondary winding terminals of the isolation transformer T-n are short-circuited, current flows through the secondary winding of the isolation transformer T-n even though the lamp lamp L-n is disconnected. As a result, the voltage waveform V1 and current waveform l1 in the series lighting main circuit return to those in the case where there is no core breakage. During this period, the core breakage detecting subunit R-n transmits the non-breakage information.

Also, from time t03 to time t04, from time t05 to time t2, and from time t2 to time t. Up to 8... When the secondary winding terminals of the isolation transformers T-n are opened, the voltage waveform ■1 and the current waveform I1 in the series lighting main circuit are obtained.
corresponds to core breakage. During this time, the core breakage detection subunit R-n will transmit the core breakage information.

Note that the times t and T are independently determined according to a setting signal from the lamp number setting section 14.

On the other hand, in the core breakage detection base device 5, when the core breakage detection unit 6 detects a core breakage at time t01, the time t when a predetermined time has elapsed. At step 2, the breakage position determining unit 7 starts the judgment, confirms that the non-breakage information has been transmitted from the breakage detection subunit R-n for a time t, and the breakage information has been transmitted for a time T, and then turns the light off. The lamp device number data of the lamp L-n is given to the transmission section 8 via the transmission section 8 and displayed.

As a result, it is possible to determine which lamp is broken.

By the way, when a plurality of lamps are broken, the non-breakage information and breakage information of one breakage detection slave unit and the non-breakage information and breakage information of other breakage detection slave units are temporally different. They may overlap, making it impossible to identify the broken lamp.

Now, as shown in FIG. 4, the on time and off time (tl, T
,)(t2,'r2)(tn,Tn) as t1≦t2≦t
Assuming that n1T1≧T2≧Tn is established, the corresponding information D-1. D-2 and D-n are transmitted.

In this case, since the information TD in which these pieces of information are superimposed is sent to the broken-core position determination section 7, it becomes impossible to determine which lamp is broken. Therefore, in the signal sending time setting section 15 and the reset time setting section 16, the on time and off time must be set so that these determinations can be made.

As an example, as shown in FIG. 5, the on time and off time (t T ) (t2, T2) (t1' 1 , T) of the thyristor section 12 are set as tr≦corresponding to the lamp number. t2≦tn, T,≦T2≦Tn
n. If it is set as follows, the corresponding information D-
1 + D − 2, D n is the core breakage detection main unit 5
transmitted to.

The core breakage position determining unit 7 detects a core breakage based on the information TD which is a superimposition of these pieces of information. In this case, a broken lamp can be easily identified by using a simple algebraic formula. Since this determination result is displayed on the display unit 9, it is also possible to determine whether or not there is continuous core breakage.

In the above embodiment, breakage is detected based on whether the circuit current of the lamp is zero, but since the secondary voltage of the isolation transformer increases when the lamp breaks, breakage can be detected based on this voltage increase. You may.

Furthermore, in the above embodiment, a thyristor is used to short-circuit and open between the secondary winding terminals of the isolation transformer, but even if a relay, sublessor, etc. is used instead of this thyristor, the same result as described above can be achieved. It is possible to perform certain actions.

〔Effect of the invention〕

As is clear from the above explanation, according to this invention,
When detecting a break in a lamp, a break detection slave unit shorts and opens the secondary winding terminals multiple times at a set time for each lamp number, and the output voltage and current of the constant current power supply. Since it is equipped with a core break detection master unit that determines the number of the broken light lamp based on the number of broken light lamps, it is possible to determine which light lamp is broken, and whether it is a continuous break or not. It also becomes much easier to judge.

In addition, compared to conventional devices, this invention only requires the installation of a new core break detection slave unit, and moreover, the core break detection slave unit and the core break detection base unit transmit the signal axis using a series lighting circuit. Since there is no need to newly install special communication lines, it is easy to apply to existing equipment.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of the present invention, FIG. 2 is a block diagram showing a detailed configuration of the main elements of the embodiment, and FIGS. 3 to 5 show the operation of the embodiment. Fig. 6 is a block diagram showing the configuration of a conventional disconnection detection device for a series lighting circuit, Fig. 7(a)
．． (b) is a waveform diagram for explaining the operation of the device. 2... Constant current power supply device, 3... Instrument transformer, 4...
...Current transformer, 5... Core breakage detection master device, 6... Core breakage detection section, 7... Core breakage position determination section, 9... Display section, 11.
...Auxiliary current transformer, 12...Thyristor section, 13...
Core breakage detection section, 14... Lamp number setting section, 15... Signal sending time setting section, 16... Reset time setting section, 1
7...Control unit, R-1, R-2 to R-n...Breakage detection slave device.

Claims (1)

[Claims] In a series lighting circuit in which the primary windings of a large number of transformers each having a lamp connected to its secondary winding are connected in series to a constant current power supply, the voltage and current are used to detect the output voltage and output current of the constant current power supply. a detection unit provided for each of the transformers, each detecting a break in the lamp;
When detecting core breakage, there is a core breakage detector that shorts and opens the secondary winding terminals multiple times at a set time corresponding to the lamp number, and a core breakage detector that short-circuits and opens the secondary winding terminals multiple times at a set time corresponding to the lamp number. A core breakage detection device for a series lighting circuit, comprising a core breakage detection base unit that determines the lamp number of the light lamp that has been cored.