JP2751732B2 - Lightning resistance test method for in-home communication equipment using commercial power - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for testing the lightning resistance of a home communication device using a commercial power supply for testing the resistance of a home communication device using a commercial AC power supply to lightning surge.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing the configuration of a conventional lightning test circuit for a single telephone that does not use a commercial power supply.

[0003] In the figure, a lightning proof test circuit of a single telephone connects a communication line 42 to a single telephone 40 via a subscriber protector 41, and connects a subscriber protector arrester 43 to a communication line 4.
2 and a lightning surge generator 4 via a resistor (ground impedance) 44 simulating the grounding of the subscriber protector 41.
5 are connected.

In this lightning resistance test circuit, a lightning surge generator 4
5, the lightning surge voltage applied to the communication line 42 returns to the lightning surge generator 45 via the subscriber protector arrester 43 and the resistor 44, and is isolated from the single telephone 40 to the ground. No current flowed through the single telephone 40 unless destruction occurred. Therefore, even if the lightning test is performed, the telephone itself rarely breaks down, and the actual telephone installed at the site does not receive the lightning surge current as in FIG.
Very few failures.

[0005] With the advancement and diversification of communication functions, home communication devices using a commercial AC power supply are increasing. In such home communication equipment using commercial power,
Lightning surge flowing from the communication line flows out of the AC power supply line or the frame ground terminal, and conversely, lightning surge flowing from the AC power supply line flows out of the frame ground terminal or the communication line. Therefore, in a lightning proof test for a home communication device using a commercial power supply, a lightning proof test circuit having the configuration shown in FIG. 5 is used.

In FIG. 5, a lightning resistance test circuit for a home communication device using a commercial power supply connects a communication line 42 and an AC power supply line 51 to the home communication device 50, and a third-class ground terminal (frame grounding) of the home communication device 50. A lightning surge generator 45 is connected between a terminal 52) and the communication line 42 via a grounding resistance 53 of the third type grounding.

In this lightning resistance test circuit, the lightning surge flowing from the communication line 42 flows out of the third-type ground terminal 52 of the home communication device 50 and returns to the lightning surge generator 45. In other words, the lightning surge current must be
Since it passes through 0, it is possible to perform a very severe lightning test in comparison with a lightning test circuit for a single telephone. In this lightning resistance test circuit, the circuit configuration is simplified by directly applying a lightning surge voltage from the lightning surge generator 45 to the home communication device 50 without passing through the subscriber protector.

[0008]

However, the lightning test circuit of the home communication device using the commercial power supply shown in FIG. 5 has the following two problems.

[0009] The internalized electronic communication device is configured only when the power is supplied to the internal circuit. However, the lightning test circuit shown in FIG. 5 does not supply power to the indoor communication device 50. The test will be performed in a state where it is not set. Therefore, the state of the circuit when the lightning surge voltage was applied was different from the circuit condition in the actual use state, and the flow of the lightning surge current and the degree of influence did not match the actual state.

[0010] From the viewpoint of human body security and leakage detection, the AC power line used in ordinary households is 6600V to 200V or 100V.
One line is grounded by a transformer for converting to V (distribution transformer of a power company), and when viewed from the home communication device side to the AC power supply line side, it is grounded with low impedance. However, in the lightning test circuit shown in FIG. 5, since the AC power supply line 51 is open, the lightning surge
It was not possible to accurately simulate the phenomenon of wraparound from 2 to the AC power supply line 51. Conversely, communication line 4
2 is also open, so that the route from the AC power supply line 51 to the communication line 42 is different from the actual situation.

Therefore, a home-use communication device using a commercial power supply is tested by the conventional lightning-proof test circuit shown in FIG. There is a need for a lightning test that matches the actual situation of harm. In other words, in the conventional lightning test circuit, the power supply to the home communication equipment using commercial power and the grounding conditions of the AC power line and the communication line are different from the actual conditions, and the actual installation conditions and circuit conditions are not simulated. It was difficult to reproduce the damage caused by lightning.

According to the present invention, the installation conditions of a home communication device using a commercial power supply and the connection state of an AC power supply and the like are brought close to actual conditions.
It is an object of the present invention to provide a lightning test circuit for a home communication device using a commercial power supply, which can perform a reliable lightning test with a circuit configuration suitable for the actual situation.

[0013]

According to a first aspect of the present invention, there is provided a commercial power supply for applying a lightning surge voltage from a communication line of a home communication device using a commercial AC power supply and testing the proof strength against the lightning surge. In the lightning resistance test method of the home communication device, a DC power is supplied to the home communication device from the first power supply means insulated to the ground via a communication line, and the second power supply means insulated to the ground. An AC power supply is supplied through an AC power supply line, and an impedance circuit corresponding to the ground return impedance of the AC power supply line is connected between one of the AC power supply lines in the power supply state and the ground, or A lightning surge test is performed by grounding one wire and applying a lightning surge voltage to a communication line in a power supply state via a coupling circuit.

[0014] According to a second aspect of the present invention, a lightning withstand voltage is applied to a home power communication device using a commercial power supply, which applies a lightning surge voltage from an AC power supply line of the home communication device using a commercial AC power supply and tests the resistance to the lightning surge. In the test method, DC power is supplied to the home communication device from the first power supply means insulated to the ground via the communication line, and an AC power line is supplied from the second power supply means insulated to the ground. AC power is supplied through the power supply, and an impedance circuit corresponding to the ground return impedance of the communication line is connected between the communication line in the power supply state and the ground, and the lightning surge voltage is connected to the AC power supply line in the power supply state through a coupling circuit. Is applied to perform a lightning resistance test.

[0015]

According to the present invention, by supplying power to a communication line and an AC power supply line from power supply means insulated from the ground, the electronic circuit of the home communication device can be activated, and the installation of the home communication device can be achieved. A lightning test can be performed under conditions close to the conditions.

When a lightning surge voltage is applied from a communication line, the AC power supply line is grounded by a predetermined impedance circuit, and when a lightning surge voltage is applied from the AC power supply line, the communication line is grounded by a predetermined impedance circuit. By doing
It is possible to set the actual electric circuit conditions of the home communication device, and it is possible to carry out a lightning resistance test according to the actual situation.

[0017]

FIG. 1 is a block diagram showing the configuration of a first embodiment of a lightning test circuit for realizing the method according to the first aspect of the present invention. The invention described in claim 1 is a lightning resistance test method assuming that a lightning surge flows from a communication line.

In FIG. 1, a pseudo subscriber circuit 11 simulating an exchange is connected to a home communication device 50 via a communication line 42, and an AC power supply is supplied via an AC power line 51, an insulation transformer 12 and a power switch 13. Connecting. Communication line 42
Is connected to a lightning surge generator 45 via an arrester 14 as a coupling circuit. One of the AC power supply lines 51 is connected via an impedance circuit 15 corresponding to the ground return impedance of the AC power supply line, and the third type ground terminal 52 of the home communication device 50 is connected to a third type grounding resistance 53. And the ground terminal of the lightning surge generator 45 is connected.

Here, the pseudo subscriber circuit 11 is a device capable of simulating the operation of the subscriber circuit of the exchange installed in the central office. That is, while supplying DC voltage to the home communication device 50 via the communication line 42,
This is a device that can operate as an exchange subscriber circuit in accordance with off-hook and on-hook of the home communication device 50.
The pseudo subscriber circuit 11 is driven by a battery,
It is desirable to be sufficiently insulated from the ground. In this way, by providing a power supply system insulated from the ground, it is possible to prevent a lightning surge from wrapping around, and to perform a lightning resistance test without causing a failure of the pseudo subscriber circuit 11.

The arrester 14 operates when the lightning surge generator 45 outputs a lightning surge voltage, and has a function of transmitting the lightning surge voltage to the communication line 42.
Gas discharge tubes, diodes, capacitors and other communication lines 4
2 is a coupling element having electrical characteristics that does not hinder the power supply conditions and signal conditions.

The insulation transformer 12 separates the lightning proof test circuit from the commercial AC power supply while supplying commercial AC power to the lightning proof test circuit, and a lightning surge flows out of the circuit other than the lightning proof test circuit. And prevent AC power line 51
Used to enable the grounding of one wire. Therefore, the insulation transformer 12 is required to have a dielectric strength such that the lightning surge voltage applied in the lightning test circuit does not flow to other places.

Incidentally, instead of the insulating transformer 12,
Common mode choke coils can be used.
However, in order to prevent the lightning surge from flowing to the commercial AC power supply side, it is necessary to use a coil having good dielectric strength and breaking performance.

The impedance circuit 15 includes the AC power supply line 5
1 converts the 6600V to 200V or 100V from the ground impedance at the transformer and the
This simulates the impedance of the AC power supply line 51 up to this point. As the ground impedance on the AC power supply side,
A 50Ω pseudo power supply network is used for measuring the interference wave of the communication device. However, when a lightning surge goes from the communication line 42 to the AC power supply line 51 via the home communication device 50, an impedance circuit is used. The smaller the resistance value of No. 15 is, the easier it is to go around to the AC power supply side, and the test conditions are severe. Therefore, the impedance circuit 15
Use a 50Ω pseudo power supply network or select 0Ω (short circuit) under severe conditions.

Further, since the grounding resistance 53 of the third type grounding simulates the third type grounding for human body security, when the home communication device 50 has a double insulation structure, the frame resistance of the frame is reduced. Since there is no ground terminal, there is no need to connect it, but in the case of equipment that does not have a double insulation structure, it must be connected. Since the ground resistance 53 of the third-class ground is set to 100Ω or less according to the technical standards of electrical equipment, the resistance value can be in the range of 0 to 100Ω. Takes into account the resistance value is 100
Ω is the most severe condition.

In such a lightning test circuit, first, the pseudo subscriber circuit 11 is operated to supply power to the communication line 42, and the power switch 13 is turned on to bring the home communication device 50 into the same state as the actual use state. . Next, the lightning surge generator 45 is operated to generate a predetermined lightning surge voltage, and is applied to the communication line 42 via the arrester 14. Communication line 42
Does not flow out from the pseudo subscriber's circuit 11 side, all of the lightning surge flows into the in-home communication device 50, from the AC power supply line 51 via the impedance circuit 15, and to the third type ground. The process returns to the lightning surge generator 45 via the resistor 53.

By keeping the home communication device 50 in a power supply state, a lightning resistance test can be performed under the same conditions as actual use conditions, and the inflow and outflow paths of the lightning surge and the effects of the lightning surge are close to the actual conditions. Things. In addition, a lightning test can be performed for each operation sequence, such as when off-hook or dialing, if necessary.

Further, in this lightning resistance test circuit, since one of the AC power supply lines 51 is grounded, the lightning surge
Can be simulated, and a situation close to the actual use can be set as a test system.

In the lightning resistance test, it is important to prevent the lightning surge from sneaking into devices other than the test circuit and to conduct the test in a closed system. In the lightning test circuit, the insulation transformer 12 is inserted into the AC power supply line 51 or the communication line 42 is connected.
Since the battery power is used for power supply to the equipment, it is completely separated from the parts other than the test circuit, so that the lightning surge does not flow to other devices.

FIG. 2 is a block diagram showing a configuration of a second embodiment of a lightning test circuit for realizing the method according to the first aspect of the present invention. In the figure, the feature of this embodiment is that power is supplied to the communication line 42 from the pseudo subscriber circuit 21 connected to the commercial AC power supply via the common mode choke coil 22 and to the AC power supply line 51. Is performed through a DC / AC converter 24 connected to a battery 23. Other lightning surge generating circuit 45, arrestor 14, impedance circuit 15, and grounding resistor 53 of the third class grounding
Are connected in the same manner as in the first embodiment, and the lightning test operation is performed in the same manner.

Here, the common mode choke coil 22
Is for preventing a lightning surge current from flowing into the pseudo subscriber circuit 21, and has a withstand voltage of several kV to several tens of kV and a breaking performance. In addition, by connecting an insulation transformer 12 similar to the one connected to the AC power supply line 51 in the first embodiment to the AC power supply side of the pseudo-subscriber circuit 21, the lightning surge wraps around to the AC power supply side. Can be completely prevented.

The DC / AC converter 24 and the battery 23 connected to the AC power supply line 51 are also for realizing a power supply system insulated from the ground. It plays a role in preventing lightning surge from entering the system.

FIG. 3 is a block diagram showing an embodiment of a lightning test circuit for realizing the method of the present invention. The invention according to claim 2 is a lightning resistance test method assuming that a lightning surge flows from an AC power supply line.

In the figure, a quasi-subscriber circuit 11 simulating an exchange is connected to an in-home communication device 50 via a communication line 42, and an AC power supply is supplied via an AC power supply line 51, an insulating transformer 12 and a power switch 13. Connecting. The lightning surge generator 45 is connected to the AC power supply line 51 via the arrester 14 as a coupling circuit. A lightning surge is applied to the communication line 42 via an impedance circuit 31 corresponding to the earth return impedance of the communication line, and to a third-type ground terminal 52 of the home communication device 50 via a third-type grounding resistor 53. The ground terminal of the generator 45 is connected.

Here, the impedance circuit 31 is composed of a capacitor alone assuming only electrostatic coupling between the communication line 42 and the ground, or a circuit combining a coil, a resistor and a capacitor in consideration of the resistance and inductance components.

The lightning resistance test operation and its effects in this embodiment are the same as those in the first embodiment corresponding to the first aspect of the present invention, and will not be described. In this embodiment, a power supply system similar to that of the second embodiment corresponding to the first aspect of the present invention can be configured.

[0036]

As described above, according to the present invention, the home communication device is supplied with power, and one of the AC power supply lines or the communication line is grounded corresponding to the side to which the lightning surge voltage is applied. The lightning resistance test can be performed in the same situation as the use situation of the lightning, and the influence of the inflow and outflow paths of the lightning surge current and the lightning surge can be made close to the actual situation. Therefore, a lightning resistance test with very good fault reproducibility can be performed.

Further, since the home communication device is in the power supply state, a lightning test can be performed for each operation sequence of the home communication device. Further, the present lightning resistance test method is not limited to the lightning surge, and can be applied to a test method for conducting a immunity test of a conducted disturbance wave or the like.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of a lightning resistance test circuit for realizing the method according to the first embodiment.

FIG. 2 is a block diagram showing a configuration of a second embodiment of a lightning test circuit for realizing the method according to the first embodiment.

FIG. 3 is a block diagram showing a configuration of an embodiment of a lightning resistance test circuit for realizing the method according to the second embodiment.

FIG. 4 is a block diagram showing a configuration of a conventional lightning resistance test circuit for a single telephone that does not use a commercial power supply.

FIG. 5 is a block diagram showing a configuration of a conventional lightning resistance test circuit for a home communication device using a commercial power supply.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Pseudo subscriber circuit 12 Insulation transformer 13 Power switch 14 Arrester 15 Impedance circuit 21 Pseudo subscriber circuit 22 Common mode choke coil 23 Battery 24 DC / AC converter 31 Impedance circuit 40 Single telephone 41 Subscriber protector 42 Communication line 43 Subscription Security device arrester 44 Resistance 45 Lightning surge generator 50 Home communication equipment 51 AC power line 52 Class 3 grounding terminal 53 Class 3 grounding resistance

Claims (2)

(57) [Claims] 1. A method for applying a lightning surge voltage from a communication line of a home communication device using a commercial AC power supply to a lightning resistance test method for a home communication device using a commercial power source for testing a resistance to the lightning surge. To supply DC power from the first power supply means insulated to the ground via the communication line, and to supply AC power from the second power supply means insulated to the ground via the AC power line. Connecting an impedance circuit corresponding to the ground return impedance of the AC power supply line between one of the AC power supply lines in the power supply state and ground, or grounding one of the AC power supply lines, A lightning resistance test method for a home communication device using a commercial power supply, wherein a lightning surge voltage is applied to a line through a coupling circuit to perform a lightning resistance test. 2. A method for applying a lightning surge voltage from an AC power supply line of an in-home communication device using a commercial AC power supply to test a resistance to the lightning surge. A DC power supply is supplied to the device from the first power supply means insulated to the ground via the communication line, and an AC power supply is supplied from the second power supply means insulated to the ground via the AC power supply line Then, connect an impedance circuit corresponding to the earth return impedance of the communication line between the communication line in the power supply state and the ground, and apply a lightning surge voltage to the AC power supply line in the power supply state via a coupling circuit to perform a lightning resistance test. A method for testing lightning resistance of in-home communication equipment using commercial power, characterized by performing the following.