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A voltage type grounding protector

A protector and voltage-type technology, applied in the field of voltage-type grounding protectors, can solve the problems of increased cost, difficulty, and low sampling voltage, and achieve the effect of ensuring safety

Active Publication Date: 2018-06-19
杭州华杭电子电器有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The difficulty of using this patent here is: the sampling voltage (that is, the overvoltage value is 50V or 24V) is relatively low and the internal resistance of the signal source is relatively high, the output power is very small, and the release cannot be driven to achieve tripping. The way to deduct is to add an auxiliary power supply, but in many cases it is difficult and the cost increases

Method used

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  • A voltage type grounding protector
  • A voltage type grounding protector
  • A voltage type grounding protector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: refer to Figure 1~4 . A voltage-type grounding protector, including an input circuit, a rectification circuit, an energy storage circuit, a trigger circuit, and an execution circuit;

[0029] Input circuit: It includes two input terminals, one is connected to the exposed conductive part of the protected electrical appliance, and the other is the grounding probe 8. There is a distance of L between the conductive part and the grounding probe, generally 50cm or bigger;

[0030] Rectifier circuit: the rectifier circuit includes a bridge rectifier or a full-wave rectifier, and the signal introduced by the input circuit is converted into a direct current through a bridge rectifier or a full-wave rectifier; the signal voltage collected by the input circuit is connected in series with a resistor R1 and enters the rectifier . The rectifier is a bridge rectifier or a full wave rectifier, which outputs a DC voltage. The series resistor R1 acts as a current limit...

Embodiment 2

[0037] Embodiment 2: refer to Figure 1~4 . The input circuit includes a first current-limiting resistor 1, the executive circuit is a tripping coil 5 composed of an electromagnet and an automatic switch, the trigger circuit includes a thyristor 6, a voltage regulator tube 4, and the rectifier circuit is a bridge type rectifier 2, the bridge rectifier 2 includes a first pin a, a second pin b, a third pin c, and a fourth pin d, and the conductive shell of the electrical equipment is connected in series with the first pin a A current-limiting resistor 1, the grounding probe is connected to the third pin c, the second pin b is connected to the M1 end of the tripping coil 5, and the M2 end of the tripping coil 5 is connected to the anode A3 end of the thyristor 6. The cathode K1 end of the thyristor 6 is connected to the fourth pin d, the energy storage capacitor 3 is connected in parallel between the second pin b and the fourth pin d, and the control pole G2 end of the thyristor...

Embodiment 3

[0040] Embodiment 3: refer to Figure 1~4. Let's take the street light pole as a practical example: In order to protect the safety of the lamps, the light pole must have a switch for overcurrent and short circuit protection. Now this kind of switch uses a cheap and general assembled miniature circuit breaker. The switch itself has a small The window enters a linkage lever from the outside, which can be tripped with a slight flip. The grounding protector is also installed in a similar assembled shell, and the two form a perfect assembled combination. Sampling circuit, rectification circuit, energy storage circuit, trigger circuit and execution circuit are installed inside the grounding protector. When a dangerous voltage above 24v appears on the light pole, the signal is sampled, rectified, and energy is stored. When the specified value is reached, the energy storage capacitor is triggered. Discharge the executive electromagnet, and the electromagnet drives the linkage rod to...

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Abstract

The invention relates to a voltage-type earth leakage protector, which comprises an input circuit, a rectifying circuit, an energy storage circuit, a trigger circuit and an execution circuit, wherein the input circuit comprises two input ends; one input end is connected with an exposed conductive part of a protected electrical appliance; a grounded probe is arranged at the other input end; the rectifying circuit comprises a bridge rectifier or a full-wave rectifier; direct-current voltage obtained by the rectifying circuit is input into an energy storage capacitor to store electric energy; the trigger circuit is connected with an anode of a thyristor through a cathode of a transient voltage suppressor (TVS) (or voltage-regulator) tube or is connected with the anode of the energy storage capacitor; the anode of the TVS (or voltage-regulator) tube is connected with a trigger electrode of the thyristor; the cathode of the thyristor is connected with the cathode of the energy storage capacitor; the execution circuit comprises a trip coil or an alarm apparatus; the trip coil is composed of an electromagnet and an automatic switch; and the electromagnet receives discharge current of the energy storage capacitor, and acts to push the automatic switch to trip or the energy storage capacitor discharges the alarm apparatus and sends out alarm sound.

Description

technical field [0001] The invention relates to a safety protection electrical appliance for low-voltage electrical equipment, in particular to a voltage-type grounding protector. Background technique [0002] The anti-shock protection of low-voltage electrical equipment is currently realized by grounding protection, which is a traditional method. Taking the commonly used TT grounding protection system as an example, its requirements for grounding resistance, safety voltage, and protection tripping current are: [0003] R≤U / I (1) [0004] In the formula: R is the grounding resistance of the metal casing of the protected electrical equipment, generally selected as 4-10 ohms; [0005] I is the tripping current of the protected electrical equipment; [0006] U is the selected safe voltage, generally 50V. [0007] In this way, the metal casing of the electrical equipment will not have a dangerous voltage above 50V, and once it occurs, the protective switch of the electrical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/04H01R4/66
Inventor 郭行干谢谆琳谢华跃郭黎
Owner 杭州华杭电子电器有限公司