CN220754339U - High-frequency interference resistant leakage circuit breaker - Google Patents
High-frequency interference resistant leakage circuit breaker Download PDFInfo
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- CN220754339U CN220754339U CN202322361360.1U CN202322361360U CN220754339U CN 220754339 U CN220754339 U CN 220754339U CN 202322361360 U CN202322361360 U CN 202322361360U CN 220754339 U CN220754339 U CN 220754339U
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Abstract
The utility model discloses a high-frequency interference resistant residual current circuit breaker, and belongs to the technical field of power protection equipment. The device comprises a thyristor voltage regulating circuit, an inductive ballast, a leakage current zero sequence release, a circuit breaker mechanism and an interference compensation capacitor; the thyristor voltage regulating circuit is connected in series with the inductive ballast and then connected between each opposite grounding wire in the power distribution system; the interference compensation capacitor is divided into three phases connected between each opposite grounding wire of the power distribution system; the transformer of the leakage current zero sequence release surrounds three-phase wires and zero-phase wires of the low-voltage distribution system, and the tripping actuating element of the leakage current zero sequence release is mechanically connected with the circuit breaker mechanism. According to the utility model, the ballast is driven by the thyristor voltage regulating circuit, so that the split-phase adjustable compensation inductance is realized, the low efficiency of the capacitance current to the ground of the power distribution system can be effectively compensated, thereby realizing live detection of real resistive leakage current and preventing false tripping of the leakage circuit breaker.
Description
Technical Field
The utility model relates to the technical field of power protection equipment, in particular to an electric leakage breaker applied to a low-voltage distribution system.
Background
The leakage of a low-voltage distribution system is a common problem, but along with the development of technology, due to the use of high-frequency oscillating circuits such as an internal switching power supply, a frequency converter and the like, the system can generate a lot of high-frequency ground entering current to the ground, in order to improve the electromagnetic compatibility characteristic of the electronic equipment, an anti-interference capacitor also needs to exist in the power supply of the equipment, the ground leakage current of the anti-interference capacitor is also a component part of the leakage current of the low-voltage distribution system, but the common leakage protection cannot identify the normal leakage current of the capacitor and cannot identify the high-frequency ground entering interference current, so when the two currents are large, abnormal insulation ageing leakage currents cannot be respectively generated, the leakage protection is easy to trip, and for the problem, due to the fact that whether the leakage circuit breaker in the prior art cannot identify normal leakage currents, great trouble is brought to maintenance personnel, whether the insulation is normal or not can be confirmed, and due to overlarge capacitance current of the system is too large, tripping setting values of the leakage circuit breaker must be adjusted and improved, for example, when the leakage current is increased from 30 to 50 milliamperes or one hundred milliamperes, the leakage current cannot be timely tripped, and the leakage protection effect cannot be caused by the large milliampere of a person.
Disclosure of Invention
In order to solve the technical problems, the utility model aims to provide an anti-false tripping residual current circuit breaker capable of identifying high-frequency interference current and capacitance leakage current, which can automatically identify normal ground current in a system and prevent false tripping caused by overlarge capacitance current or interference current, so that a tripping fixed value is not required to be increased to prevent false tripping accidents, and the safety of electric leakage protection is improved.
The technical problems to be solved by the utility model are realized by adopting the following technical scheme:
aiming at the problems existing in the prior art, the utility model provides the novel high-frequency interference resistance residual current circuit breaker, which can overcome the defects existing in the prior art.
The technical scheme of the utility model is as follows:
a high-frequency interference resistant leakage circuit breaker comprises a thyristor voltage regulating circuit, an inductive ballast, a leakage current zero sequence release, a circuit breaker mechanism and an interference compensation capacitor;
the thyristor voltage regulating circuits and the inductive ballasts are in the same three groups, and each group of thyristor voltage regulating circuits and the inductive ballasts are connected in series and then connected between each opposite grounding wire of the power distribution system;
the interference compensation capacitor is three capacitors with equal capacity and is divided into three phases connected between each two opposite grounding wires of the power distribution system;
the transformer of the leakage current zero sequence release surrounds ABC phase wires and zero phase wires of the distribution system, and the tripping actuating element of the leakage current zero sequence release is mechanically connected with the circuit breaker mechanism. As a preferred example, the capacitive reactance of the interference compensation capacitor is 60% of the inductive reactance of the ballast.
As a preferred example, the control angle of the thyristor voltage regulating circuit is between 0 and 180 degrees, and the voltage of the thyristor voltage regulating circuit of each phase can be independently regulated.
As a preferred example, the inductive ballast is an impedance type two terminal ballast.
The beneficial effects of the utility model are as follows:
(1) According to the utility model, a low-cost false tripping prevention leakage protection scheme is provided, a thyristor voltage regulating circuit drives a ballast to realize a split-phase adjustable compensation inductance, so that low efficiency can be effectively compensated for the capacitance current to the ground of a power distribution system, thereby realizing live detection of real resistive leakage current and preventing false tripping of a leakage circuit breaker;
(2) The potential false tripping hazard caused by the fact that the leakage circuit breaker cannot identify high-frequency interference current and capacitance current of the system is effectively solved, inefficiency can be effectively compensated through capacitance current to the ground of the power distribution system, and bypass inhibition effect on the high-frequency current is achieved, thereby realizing live detection of real resistive leakage current, only reflecting the resistive leakage current, and achieving simultaneous satisfaction of tripping sensitivity and protection safety.
(3) Compared with the prior art that complex phase angle comparison calculation is adopted to prevent false tripping, the cost is greatly reduced, and the discarded old light source device of the inductive ballast realizes the recycling of the discarded resources and utilizes the discarded light source device to be a detection instrument capable of effectively improving the distribution network safety.
Drawings
Fig. 1 is a schematic circuit diagram of a leakage breaker with high frequency interference resistance in an embodiment of the utility model.
In the figure:
1. a thyristor voltage regulating circuit;
2. an inductive ballast;
3. a leakage zero sequence release;
4. a circuit breaker mechanism;
5. interference compensation capacitance.
Detailed Description
The utility model will be further described with reference to the following detailed drawings and examples, in order to make the technical means, the creation features, the achievement of the objects and the effects of the utility model easily understood.
Examples:
the high-frequency interference resistant leakage breaker is a breaker capable of resisting the influence of high-frequency electromagnetic interference on a leakage protection function. The frequency range of the high-frequency electromagnetic interference is wide, and generally, the frequency range of the high-frequency electromagnetic interference can be from tens of thousands of hertz to gigahertz, so that the high-frequency interference resistant leakage circuit breaker needs to have a wide frequency response range so as to ensure that various high-frequency interference can be effectively filtered out.
Referring to fig. 1, a circuit schematic diagram of a leakage circuit breaker with high frequency interference resistance in an embodiment of the utility model is shown, wherein the leakage circuit breaker with high frequency interference resistance comprises a thyristor voltage regulating circuit 1, an inductive ballast 2, a leakage current zero sequence release, a circuit breaker mechanism 4 and an interference compensation capacitor 5.
As shown in fig. 1, the thyristor voltage regulating circuits 1 and the inductive ballasts 2 are in the same three groups, and each group of thyristor voltage regulating circuits 1 and the inductive ballasts 2 are connected in series and then are connected between each opposite grounding (G) line of the power distribution system; "each opposing ground line" means that in a three-phase power system, each phase conductor is grounded to ground. In the electric power system, any phase conductor of the electric power system is connected with the ground to ensure the safe and stable operation of the system.
The interference compensation capacitor 5 is three capacitors with equal capacity and is divided into three phases connected between each two opposite ground wires of the power distribution system, a transformer of the leakage current zero sequence release surrounds three-phase wires and zero phase wires of the low-voltage power distribution system, and a tripping actuating element of the leakage current zero sequence release is mechanically connected with the circuit breaker mechanism 4.
The transformer of the leakage current zero sequence release surrounds the ABC phase conductor and the zero (N) phase conductor of the distribution system, and the tripping actuating element of the leakage current zero sequence release is mechanically connected with the circuit breaker mechanism 4.
Wherein, thyristor voltage regulating circuit 1: and the power control circuit is used for adjusting the voltage by controlling the conduction angle of the thyristor.
The basic principle of the thyristor voltage regulating circuit 1 is that the controllability of the thyristor is utilized, the thyristor is used as a control switch in the circuit, and the excessive current flow in the circuit is controlled by changing the conduction angle of the thyristor, so that the voltage of the circuit is regulated.
In the thyristor voltage regulating circuit 1 in the present embodiment, the control angle of the thyristor voltage regulating circuit 1 is between 0 degrees and 180 degrees, that is, the conduction angle of the thyristor is between 0 degrees and 180 degrees. The voltage of the thyristor voltage regulating circuit 1 of each phase can be respectively and independently regulated, and the conduction angle of the thyristor refers to the time difference between the trigger pulse signal of the thyristor and the positive half cycle of the alternating current power supply, and can also be called as the conduction delay angle of the thyristor. The magnitude of the conduction angle depends on the trigger time of the trigger pulse signal of the thyristor in the positive half cycle of the power supply. The conduction angle of the thyristor can be controlled by changing the delay time of the trigger pulse signal. When the delay time of the trigger pulse signal is 0 DEG, the thyristor is turned on at the starting point moment of each positive half cycle; at a delay time of 180 degrees, the thyristor will be turned on instantaneously at the end of each positive half cycle.
The inductance ballast 2 is used as a circuit element, and is widely applied to lighting equipment, and the technical scheme of the utility model adopts the inductance ballast 2, wherein the inductance ballast 2 is an impedance type two-terminal ballast, and the current change in a circuit is limited by utilizing the self-inductance property of an inductance, so that the working state of the circuit is stabilized. Compared with the prior art that complex phase angle comparison calculation is adopted to prevent false tripping, the cost is greatly reduced, and the discarded light source device of the inductance ballast 2 is utilized to realize the recycling of discarded resources and is utilized as a detection instrument capable of effectively improving the distribution network safety.
In the technical scheme of the utility model, the leakage zero sequence release 3 is used for detecting leakage faults in the power system, wherein the leakage refers to insulation damage or current leakage caused by faults in the power system, and when the leakage current exceeds a set value, the leakage zero sequence release 3 can immediately cut off a fault circuit and coordinate with other protection equipment to protect the safety of the power system.
In the present embodiment, the interference compensation capacitance 5 is a capacitor for suppressing an interference signal in a circuit in the present utility model. In a circuit, an interfering signal is an undesired electrical signal that typically negatively affects the performance and function of the circuit. For example, when a strong interference signal is present in the circuit, it may cause fluctuations or distortions in the output of the circuit and even damage to the devices in the circuit.
In order to suppress the interference signal, an interference compensation capacitor 5 is added to the circuit. The interference compensation capacitor 5 is typically connected at the input or output of the circuit and resonates with an inductance or resistance in the circuit to form a bandpass filter capable of suppressing the interference signal.
Further, the capacitance reactance of the interference compensation capacitor 5 is at least 60% of the inductance reactance of the ballast, in this embodiment, the capacitance reactance of the interference compensation capacitor 5 is 60% of the inductance reactance of the ballast, and by setting the three-phase capacitance to ground with a larger capacitance, the capacitance reactance is very small because the capacitance reactance is close to the inductance reactance of the inductive ballast 2, so that the ground interference component in the high-frequency power supply device can be completely bypassed to the ground by the capacitance and does not flow through the zero-sequence transformer of the leakage protector, thereby avoiding the possibility of false tripping caused by the high-frequency interference component.
Further, the thyristor voltage regulating circuit 1 drives the ballast, is connected between the power supply and the grounding wire, the alternating voltage is changed by regulating the thyristor voltage regulating circuit 1, the current flowing through the ballast can be changed, the ballast is an inductance coil, thus a variable inductance is formed, the split-phase adjustable compensation inductance is realized, the ground capacitance current of the power distribution system and the ground capacitance current of the interference compensation capacitance 5 can be effectively compensated for inefficiency, the thyristor voltage regulating circuit 1 of each phase can be regulated while the reading of a leakage current clamp meter is observed during installation, and the capacitance component is counteracted by regulating the inductance size, so that the ground inductance component is exactly equal to the total ground capacitance of the system, the real leakage current resistance component can not be counteracted, the action tripping of the real leakage current of live detection is realized, and the anti-interference and anti-misoperation effect is realized.
The foregoing description and shows the general principles, features and advantages of the utility model. It will be appreciated by persons skilled in the art that the present utility model is not limited to the embodiments described above, but is capable of numerous variations and modifications without departing from the essential spirit and scope of the utility model, which are intended to fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (4)
1. The high-frequency interference resistant leakage circuit breaker is used for leakage protection in a power distribution system and is characterized by comprising a thyristor voltage regulating circuit (1), an inductive ballast (2), a leakage current zero sequence release, a circuit breaker mechanism (4) and an interference compensation capacitor (5);
the thyristor voltage regulating circuit (1) and the inductive ballast (2) are provided with the same three groups, and in each group, one thyristor voltage regulating circuit (1) and one inductive ballast (2) are connected in series and then connected between each opposite grounding wire in the power distribution system;
the interference compensation capacitor (5) is three capacitors with equal capacity and is divided into three phases connected between each two opposite grounding wires of the power distribution system;
the transformer of the leakage current zero sequence release surrounds three-phase wires and zero-phase wires of the low-voltage distribution system, and the tripping actuating element of the leakage current zero sequence release is mechanically connected with the circuit breaker mechanism (4).
2. A high-frequency interference leakage breaker according to claim 1, characterized in that the capacitive reactance of the interference compensation capacitor (5) is at least 60% of the inductive reactance of the inductive ballast (2).
3. A leakage circuit breaker against high frequency disturbances according to claim 1 characterised in that the control angle of the thyristor voltage regulator circuit (1) is between 0-180 °.
4. The high-frequency interference leakage breaker according to claim 1, wherein the inductive ballast (2) is an impedance two-terminal ballast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322361360.1U CN220754339U (en) | 2023-08-31 | 2023-08-31 | High-frequency interference resistant leakage circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322361360.1U CN220754339U (en) | 2023-08-31 | 2023-08-31 | High-frequency interference resistant leakage circuit breaker |
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| Publication Number | Publication Date |
|---|---|
| CN220754339U true CN220754339U (en) | 2024-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322361360.1U Active CN220754339U (en) | 2023-08-31 | 2023-08-31 | High-frequency interference resistant leakage circuit breaker |
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| CN (1) | CN220754339U (en) |
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2023
- 2023-08-31 CN CN202322361360.1U patent/CN220754339U/en active Active
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