CN213782860U - Lightning protection module convenient to use integrated with circuit breaker - Google Patents
Lightning protection module convenient to use integrated with circuit breaker Download PDFInfo
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Abstract
The utility model discloses a lightning protection module convenient for being integrated with a circuit breaker, which comprises a main module, wherein a detection circuit in the main module comprises a piezoresistor, a transient diode, a first zero sequence current transformer and a second zero sequence current transformer; the zero line connecting wire and the phase line connecting wire pass through a first zero sequence current transformer, the phase line connecting wire passes through a second zero sequence current transformer, one end of the piezoresistor is connected with the phase line connecting wire which passes through the first zero sequence current transformer and the second zero sequence current transformer, and the other end of the piezoresistor is connected with the zero line connecting wire which passes through the first zero sequence current transformer; one end of the transient diode is connected with the connecting end of the piezoresistor and the phase line connecting wire, and the other end of the transient diode is connected with the zero line connecting wire which penetrates through the front part of the first zero sequence current transformer. The lightning protection efficiency of the lightning protection module is obviously improved; the module form is convenient to integrate with various circuit breakers and electromagnetic switches, so that the module is upgraded to a lightning protection type and does not influence any original functions of the module.
Description
Technical Field
The utility model relates to a low pressure electrical equipment lightning protection technical field, in particular to lightning protection module of convenient and circuit breaker integrated use.
Background
The basic principle of the three-phase power lightning protection circuit widely used in the market at present is shown in fig. 1 and fig. 2. FIG. 1 is the simplest three-phase power lightning protection circuit, which uses only a common-mode lightning protection mode; the circuit of fig. 2 employs a common mode + differential mode lightning protection mode. Both methods have certain lightning protection effect, but in terms of lightning protection principle, piezoresistors of core components of the methods bear all impact of lightning current, and once the piezoresistors are damaged and cannot be found and replaced in time, the lightning protection effect is lost.
In order to protect the piezoresistor and reduce the lightning current impact on the piezoresistor, several prior disclosed technologies are improved on the basis of fig. 2. For example, the lightning protection device for the low-voltage electrical equipment of chinese patent publication No. CN1339858A and the three-phase ac lightning protection device of communication equipment of publication No. CN1599185A are added with an indicator light for each path of the piezoresistor to remind the user to check whether the piezoresistor is normal. However, from a practical standpoint, the effect is not ideal. When the lightning stroke is not great, no matter the fuse is broken or the piezoresistor is broken, the power line is not influenced, so the lightning stroke is not easy to be perceived, the electric equipment is usually damaged, the lightning protection device can be thought to be checked to be invalid, and the lightning damage happens at this time.
SUMMERY OF THE UTILITY MODEL
In order to overcome above-mentioned shortcoming and not enough, the utility model aims at providing a lightning protection module of convenient and circuit breaker integrated use, when the thunderbolt arrives, can short-term test and then the switch disconnection of signals promotion circuit breaker, the lightning impulse that the hou mian consumer of minimize switch received, this detection device also installs at the switch at the back, and the lightning impulse that its self received also can very reduce, is showing improvement its lightning protection effect and life.
Realize the utility model discloses the technical scheme of purpose is:
a lightning protection module convenient for being integrated with a circuit breaker comprises a main module, a detection circuit and a comparison amplification circuit, wherein the main module comprises the detection circuit and the comparison amplification circuit;
the detection circuit comprises a first piezoresistor, a first transient diode, a first zero sequence current transformer and a second zero sequence current transformer;
the zero line connection wire and the first phase line connection wire are arranged, the first zero line connection wire and the first phase line connection wire penetrate through a first zero sequence current transformer, the first phase line connection wire penetrates through a second zero sequence current transformer, one end of a first piezoresistor is connected with the first phase line connection wire penetrating through the first zero sequence current transformer and the second zero sequence current transformer, and the other end of the first piezoresistor is connected with the first zero line connection wire penetrating through the first zero sequence current transformer;
one end of the first transient diode is connected with the connecting end of the first piezoresistor and the first phase line connecting wire, and the other end of the first transient diode is connected with a first zero line connecting wire which penetrates through the first zero sequence current transformer;
the minimum breakdown voltage of the first transient diode is greater than the voltage-dependent voltage of the first voltage-dependent resistor;
output signals of the first zero sequence current transformer and the second zero sequence current transformer are connected with an input end of a comparison amplifying circuit, and an output end of the comparison amplifying circuit is a tripping signal output end of the main module.
Further, the device comprises a first detection filter circuit, a second detection filter circuit and a third detection filter circuit, wherein the first detection filter circuit is used for detecting a lightning wave characteristic signal and filtering high-frequency interference; the input end of the first detection filter circuit is connected with the output ends of the first zero sequence current transformer and the second zero sequence current transformer, and the output end of the first detection filter circuit is connected with the input end of the comparison amplification circuit.
Further, a first waveform shaping circuit is included, which shapes the detection signal; the input end of the first waveform shaping circuit is connected with the output end of the first detection filter circuit, and the output end of the first waveform shaping circuit is connected with the input end of the comparison amplifying circuit.
Further, the system comprises an auxiliary module, wherein the auxiliary module comprises a 2P surge protector, and the 2P surge protector is installed at the rear end of the main module when in application; the voltage-sensitive voltage value in the 2P surge protector is larger than that of the first voltage-sensitive resistor in the main module. The piezoresistor end in the 2P surge protector is respectively connected with the phase line and the zero line, and the gas discharge tube end is connected with the ground wire.
The circuit structure is a single-phase alternating current version, and the technical scheme of the three-phase alternating current version under the same idea is as follows:
a lightning protection module convenient for being integrated with a circuit breaker comprises a main module, a detection circuit and a comparison amplification circuit, wherein the main module comprises the detection circuit and the comparison amplification circuit; the detection circuits are three same detection circuits, namely a first detection circuit, a second detection circuit and a third detection circuit;
the first detection circuit comprises a first piezoresistor, a first transient diode, a first zero sequence current transformer and a second zero sequence current transformer; the zero line connection wire and the first phase line connection wire are arranged, the first zero line connection wire and the first phase line connection wire penetrate through a first zero sequence current transformer, the first phase line connection wire penetrates through a second zero sequence current transformer, one end of a first piezoresistor is connected with the first phase line connection wire penetrating through the first zero sequence current transformer and the second zero sequence current transformer, and the other end of the first piezoresistor is connected with the first zero line connection wire penetrating through the first zero sequence current transformer; one end of the first transient diode is connected with the connecting end of the first piezoresistor and the first phase line connecting wire, and the other end of the first transient diode is connected with a first zero line connecting wire which penetrates through the first zero sequence current transformer; the minimum breakdown voltage of the first transient diode is greater than the voltage-dependent voltage of the first voltage-dependent resistor;
the second detection circuit comprises a second piezoresistor, a second transient diode, a third zero-sequence current transformer and a fourth zero-sequence current transformer; the second zero line connecting wire and the second phase line connecting wire are arranged, the second zero line connecting wire and the second phase line connecting wire penetrate through a third zero sequence current transformer, the second phase line connecting wire penetrates through a fourth zero sequence current transformer, one end of a second piezoresistor is connected with the second phase line connecting wire after penetrating through the third zero sequence current transformer and the fourth zero sequence current transformer, and the other end of the second piezoresistor is connected with the second zero line connecting wire after penetrating through the third zero sequence current transformer; one end of a second transient diode is connected with the connecting end of the second piezoresistor and the second phase line connecting wire, and the other end of the second transient diode is connected with a second zero line connecting wire which penetrates through the third zero sequence current transformer; the minimum breakdown voltage of the second transient diode is greater than the voltage-dependent voltage of the second voltage-dependent resistor;
the third detection circuit comprises a third piezoresistor, a third transient diode, a fifth zero-sequence current transformer and a sixth zero-sequence current transformer; the third zero line connecting wire and the third phase line connecting wire are arranged, the third zero line connecting wire and the third phase line connecting wire pass through a fifth zero sequence current transformer, the third phase line connecting wire passes through a sixth zero sequence current transformer, one end of a third piezoresistor is connected with the third phase line connecting wire after passing through the fifth zero sequence current transformer and the sixth zero sequence current transformer, and the other end of the third piezoresistor is connected with the third zero line connecting wire after passing through the fifth zero sequence current transformer; one end of a third transient diode is connected with the connecting end of the third piezoresistor and the third phase line connecting wire, and the other end of the third transient diode is connected with a third zero line connecting wire which penetrates through the fifth zero sequence current transformer; the minimum breakdown voltage of the third transient diode is greater than the voltage-dependent voltage of the third voltage-dependent resistor;
output signals of a first zero sequence current transformer and a second zero sequence current transformer in the first detection circuit are connected with the input end of the comparison amplification circuit;
output signals of a third zero sequence current transformer and a fourth zero sequence current transformer in the second detection circuit are connected with the input end of the comparison amplification circuit;
the output signals of a fifth zero sequence current transformer and a sixth zero sequence current transformer in the third detection circuit are connected with the input end of the comparison amplification circuit;
the output end of the comparison amplifying circuit is the tripping signal output end of the main module.
Further, the device comprises a detection filter circuit, a frequency conversion circuit and a frequency conversion circuit, wherein the detection filter circuit is used for detecting the characteristic signal of the lightning wave and filtering high-frequency interference;
the detection filter circuits are three, namely a first detection filter circuit, a second detection filter circuit and a third detection filter circuit;
the input end of the first detection filter circuit is connected with the output ends of a first zero sequence current transformer and a second zero sequence current transformer in the first detection circuit, and the output end of the first detection filter circuit is connected with the input end of the comparison amplification circuit;
the input end of the second detection filter circuit is connected with the output ends of a third zero-sequence current transformer and a fourth zero-sequence current transformer in the second detection circuit, and the output end of the second detection filter circuit is connected with the input end of the comparison amplification circuit;
the input end of the third detection filter circuit is connected with the output ends of a fifth zero-sequence current transformer and a sixth zero-sequence current transformer in the third detection circuit, and the output end of the third detection filter circuit is connected with the input end of the comparison amplification circuit.
Further, a waveform shaping circuit is included, which shapes the detection signal;
the waveform shaping circuits are three, namely a first waveform shaping circuit, a second waveform shaping circuit and a third waveform shaping circuit;
the input end of the first waveform shaping circuit is connected with the output end of the first detection filter circuit, and the output end of the first waveform shaping circuit is connected with the input end of the comparison amplifying circuit;
the input end of the second waveform shaping circuit is connected with the output end of the second detection filter circuit, and the output end of the second waveform shaping circuit is connected with the input end of the comparison amplifying circuit;
the input end of the third waveform shaping circuit is connected with the output end of the third detection filter circuit, and the output end of the third waveform shaping circuit is connected with the input end of the comparison amplifying circuit.
Further, the system comprises an auxiliary module, wherein the auxiliary module comprises a 4P surge protector, and the 4P surge protector is installed at the rear end of the main module when in application; the voltage-sensitive voltage value in the 4P surge protector is larger than that of the first voltage-sensitive resistor in the main module. The piezoresistor end in the 4P surge protector is respectively connected with the three-phase line and the zero line, and the gas discharge tube end is connected with the ground wire.
The signal output by the comparison amplifying circuit is sent to a release of the circuit breaker or the electromagnetic switch and is connected with a release signal input end of the release.
As described above, the device is divided into a single-phase version and a three-phase version, under the condition that the electric equipment does not have a grounding wire, grounding is not needed, an auxiliary module is not needed, and the installation and the deployment are more flexible and convenient. The device is produced independently in a modularized mode, can be matched with various circuit breakers and electromagnetic switches, and has a lightning protection function immediately after the circuit breakers and the electromagnetic switches are added into the module without any change.
The utility model has the advantages of it is following and beneficial effect: the lightning protection module of the utility model can rapidly push the breaker switch to be switched off when detecting the high voltage of the lightning, but not passively bear the lightning energy, and the lightning protection efficiency is obviously improved; the lightning protection module is made into a module form, is simple in wiring and low in cost, is convenient to integrate with various circuit breakers and electromagnetic switches, is upgraded into a lightning protection type, and does not affect any original functions of the lightning protection module.
Drawings
FIG. 1 is a schematic diagram of a three-phase power lightning protection circuit in the prior art;
FIG. 2 is a schematic diagram of a lightning protection mode using common mode + differential mode in the prior art;
fig. 3 is a schematic circuit diagram of a single-phase version of the lightning protection module according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of the lightning protection module of FIG. 3 with the addition of a detection filter circuit;
FIG. 5 is a schematic circuit diagram of the lightning protection module of FIG. 4 with the addition of a waveform shaping circuit;
fig. 6 is a schematic circuit diagram of a three-phase version of the lightning protection module according to an embodiment of the present invention;
FIG. 7 is a schematic circuit diagram of the lightning protection module of FIG. 6 with the addition of a detection filter circuit;
fig. 8 is a schematic circuit diagram of the lightning protection module with the waveform shaping circuit added in fig. 7.
In the figure, 1 is a first phase line connecting wire 2, a first zero line connecting wire 3, a second phase line connecting wire 4, a second zero line connecting wire 5, a third phase line connecting wire 6 and a third zero line connecting wire.
The dotted frame a is the main module and the dotted frame B is the auxiliary module.
Detailed Description
The technical solutions in the embodiments of the present invention will be fully described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example (b):
as shown in fig. 3-5, a lightning protection module convenient for integrated use with a circuit breaker includes a main module a including a detection circuit and a comparison amplification circuit;
the detection circuit comprises a first voltage dependent resistor RV1, a first transient diode TVS1, a first zero sequence current transformer 11 and a second zero sequence current transformer 12;
the zero line connection device is provided with a first zero line connection wire 2 and a first phase line connection wire 1, wherein the first zero line connection wire 2 and the first phase line connection wire 1 penetrate through a first zero sequence current transformer 11, the first phase line connection wire 2 penetrates through a second zero sequence current transformer 12, one end of a first piezoresistor RV1 is connected with the first phase line connection wire 2 after penetrating through the first zero sequence current transformer 11 and the second zero sequence current transformer 12, and the other end of the first piezoresistor RV1 is connected with the first zero line connection wire 1 after penetrating through the first zero sequence current transformer 11;
one end of the first transient diode TVS1 is connected to the connection end of the first voltage dependent resistor RV1 and the first phase line connection line 1, and the other end of the first transient diode TVS1 is connected to the first zero line connection line 2 before passing through the first zero sequence current transformer 11;
the minimum breakdown voltage of the first transient diode TVS1 is greater than the voltage-dependent voltage of the first voltage-dependent resistor RV 1;
output signals of the first zero sequence current transformer 11 and the second zero sequence current transformer 12 are connected to an input end of a comparison amplifying circuit, and an output end of the comparison amplifying circuit is a tripping signal output end of the main module.
Further, the device comprises a first detection filter circuit, a second detection filter circuit and a third detection filter circuit, wherein the first detection filter circuit is used for detecting a lightning wave characteristic signal and filtering high-frequency interference; the input end of the first detection filter circuit is connected with the output ends of the first zero sequence current transformer 11 and the second zero sequence current transformer 12, and the output end of the first detection filter circuit is connected with the input end of the comparison amplification circuit.
Further, a first waveform shaping circuit is included, which shapes the detection signal; the input end of the first waveform shaping circuit is connected with the output end of the first detection filter circuit, the output end of the first waveform shaping circuit is connected with the input end of the comparison amplification circuit, and the original sharp-peak pulse signal is shaped into a quasi square-wave signal.
Further, the system comprises an auxiliary module B, wherein the auxiliary module B comprises a 2P surge protector, and the 2P surge protector is installed at the rear end of the main module A when in application; the voltage-sensitive voltage value in the 2P surge protector is larger than the voltage-sensitive voltage of the first voltage-sensitive resistor RV1 in the main module A. The end of a piezoresistor RV4 in the 2P surge protector is connected with a phase line L, the end of a piezoresistor RV7 is connected with a zero line N, and the end of a gas discharge tube G1 is connected with a ground wire.
The circuit structure is a single-phase alternating current version, and the technical scheme of the three-phase alternating current version under the same idea is as follows:
as shown in fig. 6-8, a lightning protection module convenient for integrated use with a circuit breaker includes a main module a including a detection circuit and a comparison amplification circuit; the detection circuits are three same detection circuits, namely a first detection circuit, a second detection circuit and a third detection circuit;
the first detection circuit comprises a first voltage dependent resistor RV1, a first transient diode TVS1, a first zero sequence current transformer 11 and a second zero sequence current transformer 12; the zero line connection device is provided with a first zero line connection wire 2 and a first phase line connection wire 1, wherein the first zero line connection wire 2 and the first phase line connection wire 1 penetrate through a first zero sequence current transformer 11, the first phase line connection wire 1 penetrates through a second zero sequence current transformer 12, one end of a first piezoresistor RV1 is connected with the first phase line connection wire 1 after penetrating through the first zero sequence current transformer 11 and the second zero sequence current transformer 12, and the other end of the first piezoresistor RV1 is connected with the first zero line connection wire 2 after penetrating through the first zero sequence current transformer 11; one end of the first transient diode TVS1 is connected to the connection end of the first voltage dependent resistor RV1 and the first phase line connection line 1, and the other end of the first transient diode TVS1 is connected to the first zero line connection line 2 before passing through the first zero sequence current transformer 11; the minimum breakdown voltage of the first transient diode TVS1 is greater than the voltage-dependent voltage of the first voltage-dependent resistor RV 1;
the second detection circuit comprises a second piezoresistor RV2, a second transient diode TVS2, a third zero-sequence current transformer 21 and a fourth zero-sequence current transformer 22; a second zero line connecting wire 4 and a second phase line connecting wire 3 are arranged, the second zero line connecting wire 4 and the second phase line connecting wire 3 pass through a third zero sequence current transformer 21, the second phase line connecting wire 3 passes through a fourth zero sequence current transformer 22, one end of a second piezoresistor RV2 is connected with the second phase line connecting wire 3 after passing through the third zero sequence current transformer 21 and the fourth zero sequence current transformer 22, and the other end of the second piezoresistor RV2 is connected with the second zero line connecting wire 4 after passing through the third zero sequence current transformer 21; one end of the second transient diode TVS2 is connected to the connection end of the second voltage dependent resistor RV2 and the second phase line connection line 3, and the other end of the second transient diode TVS2 is connected to the second zero line connection line 4 before passing through the third zero sequence current transformer 21; the minimum breakdown voltage of the second transient diode TVS2 is greater than the voltage-dependent voltage of the second voltage-dependent resistor RV 2;
the third detection circuit comprises a third piezoresistor RV3, a third transient diode TVS3, a fifth zero-sequence current transformer 31 and a sixth zero-sequence current transformer 32; a third zero line connecting wire 6 and a third phase line connecting wire 5 are arranged, the third zero line connecting wire 6 and the third phase line connecting wire 5 pass through a fifth zero sequence current transformer 31, the third phase line connecting wire 5 passes through a sixth zero sequence current transformer 32, one end of a third piezoresistor RV3 is connected with the third phase line connecting wire 5 after passing through the fifth zero sequence current transformer 31 and the sixth zero sequence current transformer 32, and the other end of the third piezoresistor RV3 is connected with the third zero line connecting wire 6 after passing through the fifth zero sequence current transformer 31; one end of a third transient diode TVS3 is connected to the connection end of the third varistor RV3 and the third phase line connection line 5, and the other end of the third transient diode TVS3 is connected to the third zero line connection line 6 before passing through the fifth zero sequence current transformer 31; the minimum breakdown voltage of the third transient diode TVS3 is greater than the voltage-dependent voltage of the third voltage-dependent resistor RV 3;
the output signals of a first zero sequence current transformer 11 and a second zero sequence current transformer 12 in the first detection circuit are connected with the input end of a comparison amplification circuit;
the output signals of a third zero sequence current transformer 21 and a fourth zero sequence current transformer 22 in the second detection circuit are connected with the input end of the comparison amplification circuit;
the output signals of a fifth zero-sequence current transformer 31 and a sixth zero-sequence current transformer 32 in the third detection circuit are connected with the input end of the comparison amplification circuit;
the output end of the comparison amplifying circuit is the tripping signal output end of the main module.
Further, the device comprises a detection filter circuit, a frequency conversion circuit and a frequency conversion circuit, wherein the detection filter circuit is used for detecting the characteristic signal of the lightning wave and filtering high-frequency interference;
the detection filter circuits are three, namely a first detection filter circuit, a second detection filter circuit and a third detection filter circuit;
the input end of the first detection filter circuit is connected with the output ends of a first zero-sequence current transformer 11 and a second zero-sequence current transformer 12 in the first detection circuit, and the output end of the first detection filter circuit is connected with the input end of the comparison amplification circuit;
the input end of the second detection filter circuit is connected with the output ends of a third zero-sequence current transformer 21 and a fourth zero-sequence current transformer 22 in the second detection circuit, and the output end of the second detection filter circuit is connected with the input end of the comparison amplification circuit;
the input end of the third detection filter circuit is connected with the output ends of a fifth zero-sequence current transformer 31 and a sixth zero-sequence current transformer 32 in the third detection circuit, and the output end of the third detection filter circuit is connected with the input end of the comparison amplification circuit.
Further, a waveform shaping circuit is included, which shapes the detection signal;
the waveform shaping circuits are three, namely a first waveform shaping circuit, a second waveform shaping circuit and a third waveform shaping circuit;
the input end of the first waveform shaping circuit is connected with the output end of the first detection filter circuit, and the output end of the first waveform shaping circuit is connected with the input end of the comparison amplifying circuit;
the input end of the second waveform shaping circuit is connected with the output end of the second detection filter circuit, and the output end of the second waveform shaping circuit is connected with the input end of the comparison amplifying circuit;
the input end of the third waveform shaping circuit is connected with the output end of the third detection filter circuit, and the output end of the third waveform shaping circuit is connected with the input end of the comparison amplifying circuit.
Further, the system comprises an auxiliary module B, wherein the auxiliary module B comprises a 4P surge protector, and the 4P surge protector is installed at the rear end of the main module A when in application; the voltage-sensitive voltage value in the 4P surge protector is larger than the voltage-sensitive voltage of the first voltage-sensitive resistor RV1 in the main module A. The ends of piezoresistors RV4, RV5 and RV6 in the 4P surge protector are respectively connected with three-phase lines L1, L2 and L3, the end of piezoresistor RV7 is connected with a zero line N, and the end of a gas discharge tube G1 is connected with a ground wire.
The signal output by the comparison and amplification circuit is sent to a release M1 of a circuit breaker or an electromagnetic switch and is connected with a release signal input end of a release M1.
The auxiliary module B is not necessarily installed, and if the electric equipment to be protected is connected with a ground wire, the auxiliary module B is necessarily installed, and otherwise, the auxiliary module B is not required to be installed.
Taking the single-phase version as an example, in a normal state, the switch K1 is closed, the circuit normally supplies power to the electric equipment, the first transient diode TVS1 and the first voltage dependent resistor RV1 inside the main module a of the lightning protection module are both in a high-resistance state and are not conducted, and neither the first zero-sequence current transformer 11 nor the second zero-sequence current transformer 12 outputs power.
When the high voltage of thunder arrives, the first transient diode TVS1 is firstly conducted, the primary side of the first zero sequence current transformer 11 has current passing, the induced current generated on the secondary side is sent to the first detection filter circuit, the output signal passes through the waveform shaping circuit and the comparison amplifying circuit and is finally output to the release M1 of the circuit breaker to push the release, and the switch K1 is disconnected, so that the electric equipment behind the circuit is protected from being damaged by lightning.
The first transient diode TVS1 and the first varistor RV1 are both in parallel relationship, each playing a different role: the first transient diode TVS1 has a much higher response speed to a high lightning voltage than the first voltage dependent resistor and is used for detecting a lightning signal, but the current capacity of the first voltage dependent resistor RV1 is smaller, the current capacity of the first voltage dependent resistor RV1 is larger, the voltage dependent voltage is lower than the minimum breakdown voltage of the transient diode, the first transient diode TVS1 can be protected, and meanwhile, the voltage between the phase line L and the zero line N is clamped, so that the safety of the following electric equipment is protected.
In the case of an electric device with a ground wire, a lightning protection auxiliary module B must be installed, when a lightning arrives, the main module a sends a signal to turn off the switch K1, the first varistor RV1 clamps the phase voltage to make it smaller than the withstand voltage level of the protected device, however, the first varistor RV1 only limits the voltage difference between the zero line N and the phase line L, i.e. the potential difference, and cannot reduce the potential of the phase line L, for example, after the phase line L is impacted by the lightning current, the first varistor RV1 clamps the voltage between the phase line L and the zero line N at 770V, then there is a possibility that the ground potential of the zero line N is 5000V to the ground potential, the ground potential of the phase line L is 5770V to the ground potential, the difference of the phase line L is very high, and if the following electric devices are grounded, they will be discharged to the ground through the device, causing the device to be damaged, therefore, in this case, the lightning protection auxiliary module B is installed, the potentials of the phase line L and the zero line N can be reduced, and the following equipment can be protected.
In an extreme case, if the first transient diode TVS1 is short-circuited, a current passes through the primary side of the first zero-sequence current transformer 11, and after detection, shaping and amplification, the release M1 obtains a signal, and the switch K1 cannot be switched on, so that a line is not on fire; if the first voltage dependent resistor RV1 is short-circuited, current passes through the primary side of the second zero sequence current transformer 12, and the switch K1 can not be switched on, so that a user is reminded to check and replace the zero sequence current transformer, and therefore the safety of the module can be guaranteed.
The connection method and the working principle of the other two detection circuits in the main module A in the three-phase version are the same as those described above, and are not described again.
In order to be conveniently integrated with the existing circuit breaker and an electromagnetic switch, a main module A of the lightning protection module can be made into an independent module, and four connecting wires, namely a first phase wire connecting wire 1, a first zero line connecting wire 2 and two tripping signal connecting wires, extend out of the main module A of a single-phase version; the main module A of the three-phase version extends out of six connecting wires, namely a first phase line connecting wire 1, a second phase line connecting wire 3, a third phase line connecting wire 5, a zero line connecting wire and two tripping signal connecting wires.
In the test, the first piezoresistor RV1 of the main module A uses 25D471K, the single maximum flux is 20kA, the first transient diode TVS1 uses 1.5KE510CA, the first zero sequence current transformer 11 and the second zero sequence current transformer 12 use the specification of a common leakage circuit breaker, the tripping signal output end of the main module A is connected with a tripping device of the common leakage circuit breaker, the following test electric appliance is an incandescent lamp, no grounding wire is provided, the auxiliary module B is not needed, when the electric appliance is subjected to the test current impact with the voltage of 3kV and the current of 50kA, the switch can be quickly disconnected, the electric appliance waits for 5 minutes after the test, the test with the voltage of 3kV and the current of 50kA is continuously used, the test is continuously performed for 10 times, and the main module A and the incandescent lamp of the following electric appliance are not damaged. Due to the condition restrictions, no more current tests were done. The experiment shows that the protection capability of the first piezoresistor RV1 is remarkably improved; by increasing the flow of the first piezoresistor RV1, the lightning protection capability of the module can be improved.
The above disclosure of the preferred embodiments of the present invention is intended to be illustrative, and not to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention.
Claims (8)
1. A lightning protection module convenient for being integrated with a circuit breaker is characterized by comprising a main module, wherein the main module comprises a detection circuit and a comparison amplification circuit;
the detection circuit comprises a first piezoresistor, a first transient diode, a first zero sequence current transformer and a second zero sequence current transformer;
the zero line connection wire and the first phase line connection wire are arranged, the first zero line connection wire and the first phase line connection wire penetrate through a first zero sequence current transformer, the first phase line connection wire penetrates through a second zero sequence current transformer, one end of a first piezoresistor is connected with the first phase line connection wire penetrating through the first zero sequence current transformer and the second zero sequence current transformer, and the other end of the first piezoresistor is connected with the first zero line connection wire penetrating through the first zero sequence current transformer;
one end of the first transient diode is connected with the connecting end of the first piezoresistor and the first phase line connecting wire, and the other end of the first transient diode is connected with a first zero line connecting wire which penetrates through the first zero sequence current transformer;
the minimum breakdown voltage of the first transient diode is greater than the voltage-dependent voltage of the first voltage-dependent resistor;
output signals of the first zero sequence current transformer and the second zero sequence current transformer are connected with an input end of a comparison amplifying circuit, and an output end of the comparison amplifying circuit is a tripping signal output end of the main module.
2. The lightning protection module of claim 1, comprising a first detection filter circuit for detecting the characteristic signal of the lightning wave and filtering out high frequency interference; the input end of the first detection filter circuit is connected with the output ends of the first zero sequence current transformer and the second zero sequence current transformer, and the output end of the first detection filter circuit is connected with the input end of the comparison amplification circuit.
3. The lightning protection module for convenient integrated use with a circuit breaker of claim 2, comprising a first waveform shaping circuit that shapes the rectified signal; the input end of the first waveform shaping circuit is connected with the output end of the first detection filter circuit, and the output end of the first waveform shaping circuit is connected with the input end of the comparison amplifying circuit.
4. The lightning protection module for convenient integrated use with a circuit breaker according to claim 1, comprising a secondary module comprising a 2P surge protector, the 2P surge protector being mounted at the rear end of the primary module when in use; the voltage-sensitive voltage value in the 2P surge protector is larger than that of the first voltage-sensitive resistor in the main module.
5. A lightning protection module convenient for being integrated with a circuit breaker is characterized by comprising a main module, wherein the main module comprises a detection circuit and a comparison amplification circuit; the detection circuits are three same detection circuits, namely a first detection circuit, a second detection circuit and a third detection circuit;
the first detection circuit comprises a first piezoresistor, a first transient diode, a first zero sequence current transformer and a second zero sequence current transformer; the zero line connection wire and the first phase line connection wire are arranged, the first zero line connection wire and the first phase line connection wire penetrate through a first zero sequence current transformer, the first phase line connection wire penetrates through a second zero sequence current transformer, one end of a first piezoresistor is connected with the first phase line connection wire penetrating through the first zero sequence current transformer and the second zero sequence current transformer, and the other end of the first piezoresistor is connected with the first zero line connection wire penetrating through the first zero sequence current transformer; one end of the first transient diode is connected with the connecting end of the first piezoresistor and the first phase line connecting wire, and the other end of the first transient diode is connected with a first zero line connecting wire which penetrates through the first zero sequence current transformer; the minimum breakdown voltage of the first transient diode is greater than the voltage-dependent voltage of the first voltage-dependent resistor;
the second detection circuit comprises a second piezoresistor, a second transient diode, a third zero-sequence current transformer and a fourth zero-sequence current transformer; the second zero line connecting wire and the second phase line connecting wire are arranged, the second zero line connecting wire and the second phase line connecting wire penetrate through a third zero sequence current transformer, the second phase line connecting wire penetrates through a fourth zero sequence current transformer, one end of a second piezoresistor is connected with the second phase line connecting wire after penetrating through the third zero sequence current transformer and the fourth zero sequence current transformer, and the other end of the second piezoresistor is connected with the second zero line connecting wire after penetrating through the third zero sequence current transformer; one end of a second transient diode is connected with the connecting end of the second piezoresistor and the second phase line connecting wire, and the other end of the second transient diode is connected with a second zero line connecting wire which penetrates through the third zero sequence current transformer; the minimum breakdown voltage of the second transient diode is greater than the voltage-dependent voltage of the second voltage-dependent resistor;
the third detection circuit comprises a third piezoresistor, a third transient diode, a fifth zero-sequence current transformer and a sixth zero-sequence current transformer; the third zero line connecting wire and the third phase line connecting wire are arranged, the third zero line connecting wire and the third phase line connecting wire pass through a fifth zero sequence current transformer, the third phase line connecting wire passes through a sixth zero sequence current transformer, one end of a third piezoresistor is connected with the third phase line connecting wire after passing through the fifth zero sequence current transformer and the sixth zero sequence current transformer, and the other end of the third piezoresistor is connected with the third zero line connecting wire after passing through the fifth zero sequence current transformer; one end of a third transient diode is connected with the connecting end of the third piezoresistor and the third phase line connecting wire, and the other end of the third transient diode is connected with a third zero line connecting wire which penetrates through the fifth zero sequence current transformer; the minimum breakdown voltage of the third transient diode is greater than the voltage-dependent voltage of the third voltage-dependent resistor;
output signals of a first zero sequence current transformer and a second zero sequence current transformer in the first detection circuit are connected with the input end of the comparison amplification circuit;
output signals of a third zero sequence current transformer and a fourth zero sequence current transformer in the second detection circuit are connected with the input end of the comparison amplification circuit;
the output signals of a fifth zero sequence current transformer and a sixth zero sequence current transformer in the third detection circuit are connected with the input end of the comparison amplification circuit;
the output end of the comparison amplifying circuit is the tripping signal output end of the main module.
6. The lightning protection module of claim 5, comprising a detection filter circuit for detecting the characteristic signal of the lightning wave and filtering out the high frequency interference;
the detection filter circuits are three, namely a first detection filter circuit, a second detection filter circuit and a third detection filter circuit;
the input end of the first detection filter circuit is connected with the output ends of a first zero sequence current transformer and a second zero sequence current transformer in the first detection circuit, and the output end of the first detection filter circuit is connected with the input end of the comparison amplification circuit;
the input end of the second detection filter circuit is connected with the output ends of a third zero-sequence current transformer and a fourth zero-sequence current transformer in the second detection circuit, and the output end of the second detection filter circuit is connected with the input end of the comparison amplification circuit;
the input end of the third detection filter circuit is connected with the output ends of a fifth zero-sequence current transformer and a sixth zero-sequence current transformer in the third detection circuit, and the output end of the third detection filter circuit is connected with the input end of the comparison amplification circuit.
7. The lightning protection module of claim 6, further comprising a waveform shaping circuit that shapes the rectified signal;
the waveform shaping circuits are three, namely a first waveform shaping circuit, a second waveform shaping circuit and a third waveform shaping circuit;
the input end of the first waveform shaping circuit is connected with the output end of the first detection filter circuit, and the output end of the first waveform shaping circuit is connected with the input end of the comparison amplifying circuit;
the input end of the second waveform shaping circuit is connected with the output end of the second detection filter circuit, and the output end of the second waveform shaping circuit is connected with the input end of the comparison amplifying circuit;
the input end of the third waveform shaping circuit is connected with the output end of the third detection filter circuit, and the output end of the third waveform shaping circuit is connected with the input end of the comparison amplifying circuit.
8. The lightning protection module according to claim 5, comprising a secondary module comprising a 4P surge protector, the 4P surge protector being mounted at the rear end of the primary module when in use; the voltage-sensitive voltage value in the 4P surge protector is larger than that of the first voltage-sensitive resistor in the main module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022810166.3U CN213782860U (en) | 2020-11-30 | 2020-11-30 | Lightning protection module convenient to use integrated with circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022810166.3U CN213782860U (en) | 2020-11-30 | 2020-11-30 | Lightning protection module convenient to use integrated with circuit breaker |
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| Publication Number | Publication Date |
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| CN213782860U true CN213782860U (en) | 2021-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022810166.3U Withdrawn - After Issue CN213782860U (en) | 2020-11-30 | 2020-11-30 | Lightning protection module convenient to use integrated with circuit breaker |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112290507A (en) * | 2020-11-30 | 2021-01-29 | 桂林仁立达科技有限责任公司 | Lightning protection module convenient to use integrated with circuit breaker |
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2020
- 2020-11-30 CN CN202022810166.3U patent/CN213782860U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112290507A (en) * | 2020-11-30 | 2021-01-29 | 桂林仁立达科技有限责任公司 | Lightning protection module convenient to use integrated with circuit breaker |
| CN112290507B (en) * | 2020-11-30 | 2024-07-23 | 桂林仁立达科技有限责任公司 | Lightning protection module convenient to use with circuit breaker integration |
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