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Leakage relay

A relay and leakage detection technology, which is applied in the direction of the protection reacting to the fault current, the switch operated by the ground fault current, etc., can solve the problem of the analog increase of the leakage current of the zero-phase sequence converter, and achieve the effect of high reliability

Inactive Publication Date: 2011-04-13
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Of course, if we focus on the test itself, since, for example, the variable resistor is used to short-circuit the different electrodes of the zero-phase-sequence converter in a bridging manner, if the resistance value of the variable resistor is gradually reduced, then The zero-phase-sequence converter will be recognized as a simulation of the leakage current, so not only does not depend on the test device, but also can confirm the leakage detection function including the zero-phase-sequence converter, but in consideration of safety or simplicity In the case of

Method used

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Embodiment approach 1

[0022] FIG. 1 is a diagram showing a circuit diagram including an earth leakage relay in Embodiment 1 of the present invention.

[0023] The leakage relay 40 is connected to both ends of the zero-phase-sequence converter 20 via the connecting wire 30, and the zero-phase-sequence converter 20 is arranged in the circuit 10 of the main circuit for detecting the zero-phase-sequence current of the circuit 10. The relay 40 has: a detection resistor 42, which converts the output current of the zero-phase-sequence converter 20 into a voltage signal; a leakage detection circuit 46, which judges the level of the voltage signal from the detection resistor 42, thereby detecting the leakage of the circuit 10 and output circuit 47, which amplifies the output of this leakage detection circuit 46, and when leakage detection circuit 46 detects leakage, the leakage indication LED 48 is lighted by output circuit 47, and the leakage alarm output relay 49 is driven simultaneously.

[0024] In addi...

Embodiment approach 2

[0032] FIG. 2 is a circuit diagram showing Embodiment 2 of the present invention.

[0033] In Embodiment 1 described above, the analog waveform generation circuit 53 that generates the analog waveform for testing is controlled by the output of the comparison circuit 50 that compares the potentials between the midpoints A and B of the Wheatstone bridge 41. However, in When the test button 52 is operated and the earth leakage relay 40 does not operate, it cannot be identified which one of the connection of the zero-phase-sequence converter 20 and the earth leakage detection circuit 46 is abnormal.

[0034] Therefore, in Embodiment 2, it is set that when the zero-phase-sequence converter 20 is not connected (including the case where the connection wire 30 of the zero-phase-sequence converter 20 is disconnected), the Wheatstone The potential between the midpoints A and B of the bridge 41 becomes the potential of the point A>the potential of the point B, so that the comparison circ...

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Abstract

The invention obtains a creepage relay which can input the testing simulative wave shape to the creepage detecting circuit, or be inputted by the user without using the switch on the signal line in the creepage detecting circuit, and under the situation of confirming the normal connection of the zero-phase serial converter. The relay has: a Wheatstone bridge (44), which is arranged between the creepage detecting circuit (46) and the zero-phase serial converter (20); the bridge is composed of four resistors by taking the detecting resistor (42) as resistor arm; a comparing circuit (50), which compares levels between the middle point A, B for the Wheatstone bridge; and a simulating wave shape generating circuit (53), which is corresponding to the operation of the testing buttons (52) to be conducted under the situation of comparing the circuit generating sated output and inputting the simulative wave shape to the creepage detecting circuit; the Wheatstone bridge is arranged as generating the comparing level difference of the comparing circuit generating stated output between the middle point A, B under the situation of the normal connection of the zero-phase serial converter.

Description

technical field [0001] The invention relates to a leakage relay, which is connected with a zero-phase-sequence converter for detecting the zero-phase-sequence current of a circuit, and monitors the leakage state of the circuit based on the detection current. Background technique [0002] It is known that in a leakage circuit breaker as a circuit breaker, a leakage detection circuit, a zero-phase-sequence converter, and an electromagnet device composed of an integrated circuit, for example, are built in, and the zero-phase-sequence converter is detected by the leakage detection circuit. The level of the signal is judged, if it exceeds the specified value, the drive signal is output to the electromagnet device, and the main circuit is disconnected. In addition, it is also known that an earth leakage circuit breaker is equipped with a test device (test button) for checking whether or not the earth leakage detection function operates normally. [0003] This leakage circuit brea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/16H01H83/02H01H83/04
Inventor 金山健志山中尚
Owner MITSUBISHI ELECTRIC CORP