A circuit for monitoring conductive pollution

Abstract

The present invention provides a circuit for monitoring conductive pollution, including a main circuit power supply and a main circuit breaker Q, wherein the input end of the main circuit breaker Q is connected to the main circuit power supply, and the output end is connected to the power load, the main circuit power supply is connected to an uncontrolled rectifier circuit, the output end of the uncontrolled rectifier circuit is connected to the two ends of a discharge gap X, one end of the discharge gap X is connected to a current sensor CT, and the current sensor CT is connected to a monitoring circuit. Beneficial effects of the present invention: It solves the problem that most conductive pollution cannot be effectively monitored inside a closed charged space, and can send out an early warning signal when the concentration of the conductive pollution source is too high. Cutting off all or part of the power supply through an external control protection device can avoid safety hazards caused by excessive conductive pollution in the closed space.

Description

Technical Field

[0001] The invention belongs to the field of electric power application, and in particular relates to a circuit for monitoring conductive pollution. Background Art

[0002] In existing cabinets, electrical components often short-circuit due to untimely maintenance, insufficient IP rating, sudden dust pollution and other reasons, which may cause fire and other dangers in serious cases.

[0003] Most of the monitoring instruments currently on the market use the principle of optical signal attenuation. When the dust concentration is too high, the light source signal received by the receiving end is attenuated to a certain threshold and converted into a digital or analog signal through the back-end circuit.

[0004] However, in most electrical equipment used outdoors, a small amount of dust suspended in the air will not cause malfunctions. And because of air flow, at certain times, the attenuation of the optical signal may cause the instrument to falsely report. Therefore, when using optical signal monitoring instruments, for some industrial-grade electrical equipment, the monitoring accuracy is extremely low, and the light source needs to be cleaned regularly, resulting in high maintenance costs in the later stage. Summary of the invention

[0005] In view of this, the present invention aims to provide an instrument for monitoring conductive pollution to solve the shortcomings of the above problems.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A circuit for monitoring conductive pollution comprises a main circuit power supply and a main circuit breaker Q, wherein the input end of the main circuit breaker Q is connected to the main circuit power supply, and the output end is connected to an electrical load, the main circuit power supply is connected to an uncontrolled rectifier circuit, the output end of the uncontrolled rectifier circuit is connected to two ends of a discharge gap X, one end of the discharge gap X is connected to a current sensor CT, and the current sensor CT is connected to a monitoring circuit.

[0008] Furthermore, the uncontrolled rectifier circuit includes a transformer T, rectifier diodes D1, D2, D3, and D4, the main circuit power supply is connected to contacts 1 and 2 of the transformer T, the contact 3 of the transformer T is connected to the base of the transistor V through the current control diode D5 and the resistor R2 in sequence, the contact 4 of the transformer T is respectively connected to one end of the control loop capacitor C3, the emitter of the transistor V, and one end of the discharge gap X, the other end of the control loop capacitor C3 is connected between the current control diode D5 and the resistor R2, the contact 5 of the transformer T is connected to the rectifier circuit D1-D4 through the rectifier loop capacitor C1, and the contact 6 is connected to the rectifier circuit D1-D4, the output ends of the rectifier circuit D1-D4 are connected to the two ends of the output loop capacitor C2, one end of the output loop capacitor C2 is grounded, and the other end is connected to the collector of the transistor V through the resistor R1, and the collector of the transistor V is also connected to the other end of the discharge gap X through the protection fuse FU2 and the current sensor CT in sequence.

[0009] Furthermore, the monitoring circuit includes a fault indicator light H1, a normal indicator light H2, a time relay KT, an auxiliary contact K1, an auxiliary contact K2 and a main circuit breaker Q, one end of the main circuit power supply is respectively connected to one end of the fault indicator light H1 and one end of the normal indicator light H2, the other end of the fault indicator light H1 is connected to one end of the time relay KT through the auxiliary contact K, the other end of the time relay KT is respectively connected to one end of the auxiliary contact K2 and the other end of the main circuit power supply, the other end of the auxiliary contact K2 is connected to the other end of the normal indicator light H2 through the main circuit breaker Q, and the current sensor CT is connected to the auxiliary contact K1.

[0010] Furthermore, the main circuit power supply is a three-phase four-wire system.

[0011] Furthermore, the discharge gap X is two metal plates with a gap of millimeter level.

[0012] Furthermore, the normal indicator light H2 is a green indicator light, and the fault indicator light H1 is a red indicator light.

[0013] Compared with the prior art, the circuit for monitoring conductive pollution described in the present invention has the following advantages:

[0014] The circuit for monitoring conductive pollution described in the present invention solves the problem that most conductive pollution cannot be effectively monitored in a closed charged space, and can send out a warning signal when the concentration of conductive pollution sources (such as conductive dust) is too high. The external control protection device cuts off all or part of the power supply to avoid safety hazards caused by excessive conductive pollution in the closed space. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 This is a circuit schematic diagram of a loop for monitoring conductive pollution according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0018] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0019] like Figure 1 As shown, a circuit for monitoring conductive pollution includes a main circuit power supply and a main circuit circuit breaker Q, wherein the input end of the main circuit circuit breaker Q is connected to the main circuit power supply, and the output end is connected to the power load, the main circuit power supply is connected to an uncontrolled rectifier circuit, the output end of the uncontrolled rectifier circuit is connected to the two ends of a discharge gap X, one end of the discharge gap X is connected to a current sensor CT, the current sensor CT is connected to a monitoring circuit, and the monitoring circuit is used to monitor whether there is conductive pollution in the air and determine whether to take protective measures.

[0020] The uncontrolled rectifier circuit includes a transformer T, rectifier diodes D1, D2, D3, and D4. The main circuit power supply is connected to the 1st and 2nd contacts of the transformer T. The 3rd contact of the transformer T is connected to the base of the transistor V through the current control diode D5 and the resistor R2 in sequence. The 4th contact of the transformer T is respectively connected to one end of the control loop capacitor C3, the emitter of the transistor V, and one end of the discharge gap X. The other end of the control loop capacitor C3 is connected between the current control diode D5 and the resistor R2. The 5th contact of the transformer T is connected to the rectifier circuit D1-D4 through the rectifier loop capacitor C1, and the 6th contact is connected to the rectifier circuit D1-D4. The output ends of the rectifier circuit D1-D4 are connected to the two ends of the output loop capacitor C2. One end of the output loop capacitor C2 is grounded, and the other end is connected to the collector of the transistor V through the resistor R1. The collector of the transistor V is also connected to the other end of the discharge gap X through the protection fuse FU2 and the current sensor CT in sequence.

[0021] The monitoring circuit includes a fault indicator light H1, a normal indicator light H2, a time relay KT, an auxiliary contact K1, an auxiliary contact K2 and a main circuit breaker Q. One end of the main circuit power supply is respectively connected to one end of the fault indicator light H1 and one end of the normal indicator light H2. The other end of the fault indicator light H1 is connected to one end of the time relay KT through the auxiliary contact K. The other end of the time relay KT is respectively connected to one end of the auxiliary contact K2 and the other end of the main circuit power supply. The other end of the auxiliary contact K2 is connected to the other end of the normal indicator light H2 through the main circuit breaker Q. The current sensor CT is connected to the auxiliary contact K1.

[0022] The main circuit power supply is a three-phase four-wire system.

[0023] The discharge gap X is two metal plates with a gap of millimeter level.

[0024] The normal indicator light H2 is a green indicator light, and the fault indicator light H1 is a red indicator light.

[0025] The working process of this embodiment is as follows:

[0026] When there is conductive pollution such as dust between the gap plates X, the insulation between the gaps decreases, the gaps break down and conduct, and after the current sensor CT detects the current, the auxiliary contact K1 closes, the time relay KT is energized, and after the auxiliary contact K2 delays the action, the coil of the main circuit breaker Q loses power and is disconnected. When the circuit is normal, the normal indicator H2 is always on, and when the circuit is disconnected due to a fault, the fault indicator H1 is always on.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A circuit for monitoring conductive pollution, Features: It includes a main circuit power supply and a main circuit breaker Q, wherein the input end of the main circuit breaker Q is connected to the main circuit power supply, and the output end is connected to the power load, the main circuit power supply is connected to an uncontrolled rectifier circuit, the output end of the uncontrolled rectifier circuit is connected to the two ends of the discharge gap X, one end of the discharge gap X is connected to a current sensor CT, and the current sensor CT is connected to a monitoring circuit; The uncontrolled rectifier circuit includes a transformer T, rectifier diodes D1, D2, D3, and D4, the main circuit power supply is connected to the 1st and 2nd contacts of the transformer T, the 3rd contact of the transformer T is connected to the base of the transistor V through the current control diode D5 and the resistor R2 in sequence, the 4th contact of the transformer T is respectively connected to one end of the control loop capacitor C3, the emitter of the transistor V, and one end of the discharge gap X, the other end of the control loop capacitor C3 is connected between the current control diode D5 and the resistor R2, the 5th contact of the transformer T is connected to the rectifier circuit D1-D4 through the rectifier loop capacitor C1, and the 6th contact is connected to the rectifier circuit D1-D4, the output ends of the rectifier circuit D1-D4 are connected to the two ends of the output loop capacitor C2, one end of the output loop capacitor C2 is grounded, and the other end is connected to the collector of the transistor V through the resistor R1, and the collector of the transistor V is also connected to the other end of the discharge gap X through the protection fuse FU2 and the current sensor CT in sequence; The monitoring circuit includes a fault indicator light H1, a normal indicator light H2, a time relay KT, an auxiliary contact K1, an auxiliary contact K2 and a main circuit breaker Q. One end of the main circuit power supply is respectively connected to one end of the fault indicator light H1 and one end of the normal indicator light H2. The other end of the fault indicator light H1 is connected to one end of the time relay KT through the auxiliary contact K. The other end of the time relay KT is respectively connected to one end of the auxiliary contact K2 and the other end of the main circuit power supply. The other end of the auxiliary contact K2 is connected to the other end of the normal indicator light H2 through the main circuit breaker Q. The current sensor CT is connected to the auxiliary contact K1.

2. A circuit for monitoring conductive pollution according to claim 1, Features: The main circuit power supply is a three-phase four-wire system.

3. A circuit for monitoring conductive pollution according to claim 1, Features: The discharge gap X is two metal plates with a gap of millimeter level.

4. A circuit for monitoring conductive pollution according to claim 1, Features: The normal indicator light H2 is a green indicator light, and the fault indicator light H1 is a red indicator light.

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