CN201393065Y - Electric grid surge interdiction protecting device - Google Patents

Abstract

The utility model discloses an electric grid surge interdiction protecting device which comprises a plurality of stages of surge protection circuits, a plurality of stages of bleeder and clamp circuits and current-limiting circuits, wherein a power supply line surge protection circuit is connected with the first stage of the bleeder and clamp circuit from the input end thereof, a group of the current-limiting circuits is connected in series between the first stage of the bleeder and clamp circuit and the second stage of the bleeder and clamp circuit, and the output end of a power supply line is connected between the first stage and the second stage of the bleeder and clamp circuits, the surge protection circuit of control signals is connected with the first stage of the bleeder and clamp circuit from the input end thereof, a group of the current-limiting circuits is connected in series between the first stage and the second stage of the bleeder and clamp circuits, a group of the current-limiting circuits is further connected in series between the second stage and the third stage of the bleeder and clamp circuits, the last stage of the bleeder and clamp circuit is connected in parallel with the output end of a control line. The electric grid surge interdiction protecting device can interdict or lead out high-voltage over-current emerged in the electric grid in extremely short time, prevents devices connected in the electric grid from being damaged by the over-current, well protects electrical devices, reduces the maintenance costs of engineering businesses or operation businesses, and has excellent compatibility, namely can be connected in various circuits to use, and has wide application range.

Description

A kind of electrical network surge blocks protective device

Technical field

The utility model relates to the Surge Protector of a kind of voltage, electric current.Especially for protection light current network; the light current electric terminal in ethernet line, the IP phone circuit etc. for example makes it avoid caused electrical network surges such as lightning induced voltage, power supply interference, static discharge and a kind of electrical network surge of the damage that causes blocks protective device.

Background technology

Surge also is surging, as the term suggests be exactly the transient overvoltage that exceeds normal working voltage.Say that in essence surge is a kind of violent pulse that occurs in the only millions of/one second time, may cause that the reason of surge has: the unexpected access or the starting of large-capacity electrical apparatus such as jumbo, big-block engine; Be short-circuited in the electrical network or the power supply switching.

Extensive use along with development of science and technology and electronic product, the microminiaturization of electronic device, integrated level and precision are also improving constantly, in electric equipment performance and accuracy lifting, equipment self has arrived below the milliwatt level to superpotential tolerance but worse and worse.In addition, the induction that nature thunder and lightning magnetic field is produced also can be invaded building with approach such as power line or holding wires, and the thunder and lightning temporary overvoltage overcurrent (lightning surge) of its generation is easier to damage the electric equipment in the building especially electronic equipment.Solve such light current line fault, need operation department to drop into very big man power and material and safeguard that this has had a strong impact on the operate as normal of engineering merchant and operator.In order to address this problem; adopt measures such as shielding, ground connection at present; for example Surge Protector (Surge Protection Device is abbreviated as SPD) promptly is indispensable a kind of device in the electronic equipment lightning protection; the effect of Surge Protector is that the instantaneous overvoltage of scurrying into power line, signal transmssion line is limited in the voltage range that equipment or system can bear; or powerful lightning current rushed down the inflow place, protect protected equipment or system not to be hit and damage.

Surge Protector can be divided into switching mode, votage limit type, shunting or chokes type according to its operation principle.Switching mode: its operation principle is to be rendered as high impedance when not having instantaneous overvoltage, but in case when responding the thunder and lightning instantaneous overvoltage, its impedance just sports low value, allows lightning current to pass through.During as this type of device there be device: discharging gap, gas discharge tube, thyristor etc.; Votage limit type: its operation principle is to be that height obstructs when not having instantaneous overvoltage, but constantly reduces with its impedance meeting of increase of surge current and voltage, and its current-voltage characteristic is for non-linear strongly.Device as this type of device has: zinc oxide, piezo-resistance, inhibition diode, avalanche diode etc.; In bypass type or the chokes type, bypass type is meant in parallel with protected equipment, and lightening pulse is rendered as Low ESR, and normal working frequency is rendered as high impedance; The chokes type is meant and protected devices in series, lightening pulse is rendered as high impedance, and normal operating frequency is rendered as Low ESR.

But; can satisfy in the above-mentioned technology to have to meet has than hypersensitivity to electricity excessively; can conduct the thunder-strike current discharger of 10/350 μ s pulse current; the pluggable Surge Protector that is used for secondary power distribution, the appliances power source protective device but is extremely rare up to the product line of all specification requirements of power-supply filter.Same this product line should comprise and is applicable to all circuit, promptly except that power supply, also should comprise be used to measure, control, regulation technology circuit and electronic data processing transmission circuit and the discharger that is applicable to wireless and wire communication, so that it has extensive applicability, be convenient to the client and use.

Summary of the invention

Goal of the invention of the present utility model; be deficiency at the existing Surge Protector existence of addressing in the background technology; propose a kind of electrical network surge and blocked protective device; adopt this device can be to the high pressure of the utmost point in the short time that occur in the electrical network the blocking or derive of electricity excessively; make equipment that this electrical network inserts not cause damage because of electricity excessively; well realized protection to electric equipment; reduced the maintenance cost of engineering merchant or operator; simultaneously; this surge blocks protective device and has good suitability; promptly can insert in the multiple circuit and use, applied widely, reduced client's purchase cost.

For achieving the above object, the technical solution adopted in the utility model is:

A kind of electrical network surge blocks protective device; be serially connected in the circuit of light current network; be electrically connected by circuit structure and electronic devices and components and constitute; it is characterized in that: described device is connected and composed by the surge protection circuit more than the two-stage, some grades of earial drainages and clamp circuit, current-limiting circuit; described device circuit two ends are connected with zero line N with the live wire L of light current network respectively, also are provided with overload voltage on the described device and import circuit.

Further, in the described device, by input termination first order earial drainage and clamp circuit, one group of current-limiting circuit of series connection and connect the output of supply line between first order earial drainage and clamp circuit and second level earial drainage and the clamp circuit; The surge protection circuit of control signal is by input termination first order earial drainage and clamp circuit, one group of current-limiting circuit of series connection between first order earial drainage and clamp circuit and second level earial drainage and the clamp circuit, the one group of current-limiting circuit of also connecting between second level earial drainage and clamp circuit and third level earial drainage and the clamp circuit, afterbody earial drainage and clamp circuit also connect the output of control circuit.

Further, the conjugation choke induction coil in the coaxial line circuit.

Preferably, surge protection circuits at different levels adopt two-stage or the above protective circuit of two-stage.

Further, circuit is connected with the device indicator light in the described device, and described device indicator light is parallel in the circuit of described device.

Description of drawings

Fig. 1 is the utility model circuit theory diagrams;

Embodiment

A kind of electrical network surge of the utility model blocks protective device; a kind of electrical network surge blocks protective device; be serially connected in the circuit of light current network; be electrically connected by circuit structure and electronic devices and components and constitute; it is characterized in that: described device is connected and composed by the surge protection circuit more than the two-stage, some grades of earial drainages and clamp circuit, current-limiting circuit; described device circuit two ends are connected with zero line N with the live wire L of light current network respectively, also are provided with overload voltage on the described device and import circuit.

In the embodiment that the utility model embodiment provides, by input termination first order earial drainage and clamp circuit, one group of current-limiting circuit of series connection and connect the output of supply line between first order earial drainage and clamp circuit and second level earial drainage and the clamp circuit; The surge protection circuit of control signal is by input termination first order earial drainage and clamp circuit, one group of current-limiting circuit of series connection between first order earial drainage and clamp circuit and second level earial drainage and the clamp circuit, the one group of current-limiting circuit of also connecting between second level earial drainage and clamp circuit and third level earial drainage and the clamp circuit, afterbody earial drainage and clamp circuit also connect the output of control circuit.Conjugation choke induction coil in the coaxial line circuit.Surge protection circuits at different levels adopt two-stage or the above protective circuit of two-stage.

In addition, circuit is connected with the device indicator light in the described device, and described device indicator light is parallel in the circuit of described device, and this device indicator light can be shown the state of described device.

In actual environment, conducting lightning currents and lightning subsequent current need the extremely strong discharger of discharge performance.For conducting lightning currents is imported earthing device by the equipotential bonding system, suggestion is used according to the thunder-strike current discharger of cutting arc technology band angle type gap.Have only could conduct greater than the 10/350 μ s pulse current of 50kA with it and can also realize automatic arc extinguishing, the rated voltage that this product is used can reach 400V.In addition, when short circuit current reached 4kA, this discharger can not cause that rated current is the blown fuse of 125A.

It should be noted that; above foundation embodiment shown in the drawings; describe structure of the present utility model, feature and operation principle in detail; the those skilled in the art can carry out various changes in conjunction with implementing in the scope that does not exceed main idea of the present utility model; therefore; every utilization or similar techniques scheme identical with the utility model is so long as the various equivalence change embodiment in not exceeding the utility model spirit scope all should be covered by within the protection category of the present utility model.

Claims (5)

1, a kind of electrical network surge blocks protective device; be serially connected in the circuit of light current network; be electrically connected by circuit structure and electronic devices and components and constitute; it is characterized in that: described device is connected and composed by the surge protection circuit more than the two-stage, some grades of earial drainages and clamp circuit, current-limiting circuit; described device circuit two ends are connected with zero line N with the live wire L of light current network respectively, also are provided with overload voltage on the described device and import circuit.

2, a kind of electrical network surge according to claim 1 blocks protective device, it is characterized in that in the described device, by input termination first order earial drainage and clamp circuit, one group of current-limiting circuit of series connection and connect the output of supply line between first order earial drainage and clamp circuit and second level earial drainage and the clamp circuit; The surge protection circuit of control signal is by input termination first order earial drainage and clamp circuit, one group of current-limiting circuit of series connection between first order earial drainage and clamp circuit and second level earial drainage and the clamp circuit, the one group of current-limiting circuit of also connecting between second level earial drainage and clamp circuit and third level earial drainage and the clamp circuit, afterbody earial drainage and clamp circuit also connect the output of control circuit.

3, a kind of electrical network surge according to claim 1 and 2 blocks protective device, it is characterized in that: the conjugation choke induction coil in the coaxial line circuit.

4, a kind of electrical network surge according to claim 2 blocks protective device, it is characterized in that: surge protection circuits at different levels adopt two-stage or the above protective circuit of two-stage.

5, a kind of electrical network surge according to claim 1 and 2 blocks protective device, it is characterized in that: circuit is connected with the device indicator light in the described device, and described device indicator light is parallel in the circuit of described device.