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Leakage monitoring system

A monitoring system and monitoring device technology, applied in circuit breaker testing, instruments, emergency protection devices with automatic disconnection, etc., can solve problems such as difficulty in continuous monitoring, missing abnormal warnings, and difficulty in alarm output, and achieve simple The effect of structural reliability

Inactive Publication Date: 2005-10-12
HITACHI IND EQUIP SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a case, continuous monitoring is difficult, and abnormal signs may be missed.
[0015] Compared with the circuit breaker, the monitoring device that detects the temperature through an external temperature sensor and outputs an alarm when abnormal heating occurs. The temperature management during abnormal heating does not take into account the magnitude of the load current. Since the absolute temperature is used for monitoring, for Timely alarm output is difficult for

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] figure 1 is a diagram representing an embodiment of claims 1-6 of the present invention, figure 2 It is a block diagram showing a conventional circuit breaker with a measurement function.

[0082] exist figure 1 and figure 2 Among them, 20 is a circuit breaker, 1 is an on-off controller, 2 is a receiving side terminal, 3 is a load side terminal, 4 is a measuring transformer, 5 is a measuring current transformer, 6 is a power supply circuit, 7 8 is the CPU part, 11 is the display part, 12 is the communication I / F part, 13 is the communication terminal part, 14 is the host device, 15 is the measurement output part, 200 is the switch mechanism part, 201 is the inverter part for control, 202 is the rectifier circuit part, 203 is the current detection / power supply circuit part, 204 is the instantaneous trip circuit part, 205 is the trip device, 206 is the time-limited characteristic control circuit part, 207 is the time-limited characteristic setting The fixed part, 20...

Embodiment 2

[0088] Figure 4It shows the structure of the circuit breaker and the leakage monitoring system according to claims 7-10 of the present invention.

[0089] exist Figure 4 Among them, 21 is a circuit breaker, 22 is a terminal connected to the power supply side, 23 is a switch contact, 24 is a composite steel material for detecting overcurrent, and the above switch contact 23 is in a closed state when the load current exceeds a specified value. Reference numeral 25 denotes a main conductor that connects the terminal 22 and the terminal 26 on the load side, and is arranged to pass through a zero-phase-sequence converter 27 described later. in addition, Figure 4 In order to represent a circuit breaker for three-phase three-wire or single-phase three-wire, three main conductors pass through the zero-phase sequence converter 27. 27 is a zero-phase-sequence converter, which is composed of a secondary coil 271 and a third coil 272. The secondary coil 271 is led out to the termina...

Embodiment 3

[0092] Figure 6 A monitoring system composed of the above-mentioned circuit breaker and leakage monitoring device is shown. 33 is a transformer; 34 is a switchboard, which is provided with a plurality of above-mentioned circuit breakers. Reference numeral 36 denotes a multi-circuit leakage monitoring device that can realize monitoring of a plurality of circuit breakers 21 by increasing the number of inputs based on the above-mentioned leakage monitoring device 32 , and has a communication function. 37 is a communication medium, and 38 is a high-level device such as a personal computer. 28 is the above-mentioned calibration button, which is arranged so that it can be operated from the front of the circuit breaker 21 . In addition, each circuit breaker 21 is connected to a multi-circuit leakage monitoring device 36 . In the system composed in this way, in the actual working state, power is distributed from the transformer 33 to the load equipment 35 through the circuit break...

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Abstract

The system makes it possible to monitor various electrical variables by using a simple structure at low cost with ease and with high reliability by a circuit breaker which jointly includes a current transformer to detect current, a transformer to detect voltage, and a zero-phase current transformer to detect leakage current, in addition to the switch controller to perform the basic function of the circuit breaker. Moreover, the system also provides a function to display various measured values, obtained as described above, by a display unit that can be detached and installed separately from the measuring section to display data sent in digital form by data transmission.

Description

technical field [0001] The present invention relates to techniques for monitoring the status of circuit breakers. In addition, the present invention relates to providing a zero-phase-sequence converter in the circuit breaker for monitoring the insulation state of the circuit, measuring the effective partial leakage current value included in the output current of its secondary side, and performing calculation processing in the circuit breaker , A technology that transmits data to upper or lower bits through digitized signals. [0002] Moreover, this invention relates to the technique which confirms whether a monitoring device itself has a normal function in the measurement of the leakage current of the monitoring device connected to the circuit breaker which built-in the zero-phase-sequence converter. [0003] Moreover, this invention relates to the technique of the insulation monitoring system which grasp|ascertains an insulation state. [0004] In addition, the present inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R31/327H01H83/14H02H3/00H02H3/04H02H3/33H02H3/347H02H5/04
CPCH02H3/33H01H83/144H01H2011/0068H02H3/042H02H5/04
Inventor 吉崎昭男高鸭直大后藤聪子早川英树渡边哲德涉谷春喜
Owner HITACHI IND EQUIP SYST CO LTD
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