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Leakage protector for low-load current automatic detection

A leakage protector and automatic detection technology, applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, instruments, etc., can solve the problem that the risk cannot be underestimated, and achieve the effects of easy manufacture, long service life and simple structure

Pending Publication Date: 2019-04-09
陈劲游
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, more than 90% of users do not regularly check as required, and the risk cannot be underestimated

Method used

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  • Leakage protector for low-load current automatic detection
  • Leakage protector for low-load current automatic detection
  • Leakage protector for low-load current automatic detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 As shown, a leakage protector with low load current automatic detection includes a zero-sequence current transformer TA1 set on the phase line and the neutral line, and the load side of the zero-sequence current transformer TA1 is connected to the control phase line and the zero-sequence current transformer. The main switch KM1 with on-off neutral line is characterized in that: a phase line current transformer TA2 for detecting load current is connected to the phase line between the load side of the zero sequence current transformer TA1 and the main switch KM1, and the zero sequence current transformer TA2 is connected to the phase line between the load side and the main switch KM1. The phase line on the power supply side of the sequence current transformer TA1 is connected to a current-limiting resistor assembly 1, and the current-limiting resistor assembly 1 is connected to an automatic detection switch 2 for automatic detection of low load current, an...

Embodiment 2

[0036] Such as figure 2 As shown, the current limiting resistor assembly 1 includes a resistor R1 and a resistor R2, one end of the resistor R1 and one end of the resistor R2 are respectively connected to the phase line of the power supply side of the zero-sequence current transformer TA1, and the other end of the resistor R1 is respectively connected to the automatic detection switch 2, The manual detection switch SB is connected, and the other end of the resistor R2 is connected to the ground wire current switch 3 .

[0037] The automatic detection switch 2 is a mechanical switch KM2 driven by the automatic detection switch driver 7 , and the ground current switch 3 is a mechanical switch KM3 driven by the ground current switch driver 10 .

[0038] The difference between the second embodiment and the first embodiment is that the connection modes of the resistors R1 and R2 in the current-limiting resistor assembly 1 are different, and the failure of the resistor R1 in the se...

Embodiment 3

[0040] Such as image 3 As shown, the current limiting resistor assembly 1 includes a resistor R1 and a resistor R2, one end of the resistor R1 and one end of the resistor R2 are respectively connected to the phase line of the power supply side of the zero-sequence current transformer TA1, and the other end of the resistor R1 is respectively connected to the automatic detection switch 2, The manual detection switch SB is connected, and the other end of the resistor R2 is connected to the ground wire current switch 3 .

[0041] The automatic detection switch 2 is a thyristor Q1, the positive end of the thyristor Q1 is connected to the resistor R1, the negative end of the thyristor Q1 is respectively connected to the zero line on the load side of the zero-sequence current transformer TA1, and one end of the capacitor C1, and the other end of the capacitor C1 is respectively connected to the gate of the thyristor Q1. The terminal and the automatic detection switch driver 7 are co...

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Abstract

The invention discloses a leakage protector for low-load current automatic detection. The leakage protector comprises zero-sequence current transformer TA1 arranged on a phase line and a null line ina sleeving manner; a load side of the zero-sequence current transformer TA1 is orderly connected with a phase line current transformer TA2 and a main switch KM1; the zero-sequence current transformerTA1 is in phase line connection with a current-limiting resistor module, an automatic detection switch is connected between the current-limiting resistor module and the load side null line of the zero-sequence current transformer TA1; a secondary coil output end of the zero-sequence current transformer TA1 is orderly connected with a zero-sequence current signal processor and a controller; a timermodule for regular automatic detecting timing and main switch KM1 non-tripping timing is arranged in or connected with the controller; the controller is connected with a phase line current signal processor connected with the phase line current transformer TA2, an automatic detection switch driver for driving the on-off of the automatic detection switch, and a switch-on / off device for driving theon / off of the main switch KM1.

Description

[technical field] [0001] The invention relates to a leakage protector for automatic detection of low load current. [Background technique] [0002] In daily production and life, electrical disasters caused by improper electricity use or line leakage occur frequently, causing immeasurable casualties and property losses. The installation of leakage protectors in low-voltage power distribution systems is an effective measure to avoid personal electric shock casualties and electrical fires and electrical equipment damage accidents caused by leakage. The electrical installation regulations of most countries require regular testing of the performance of the protector. In my country's electrical safety regulations, the leakage protector must be tested at least once a month to verify whether the leakage protection function is normal. However, more than 90% of users do not perform regular testing as required, and the risk cannot be underestimated. [Content of the invention] [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/32G01R31/02
CPCH02H3/32G01R31/50
Inventor 陈通陈劲游
Owner 陈劲游