JP2007003329A - Insulation monitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulation monitor allowing Igr detection in various voltage lines by one voltage input (or voltage element irrelevant to a measuring circuit), and to solve a problem point. <P>SOLUTION: This insulation monitor 1 for monitoring a receiving and distributing line constituted of an electric power supply equipment, a load equipment, and a cable way for conveying electric power between the supply equipment and the load equipment is provided with input parts 2, 3 capable of inputting a reference voltage waveform signal of the receiving and distributing line and a leak current waveform signal thereof, a conversion part 4 for digital-converting the both input signals, a setting part 5 for setting a phase line type of the receiving and distributing line, a wiring system of the receiving and distributing line, and a reference voltage waveform input phase of the receiving and distributing line, and a computing part 6 for converting a phase between both digital signals, based on a set content in the setting part 5, and for computing a leak current by a resistance based on both converted digital signals. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is an insulation monitoring device, and in particular, monitors the ground insulation state of a low piezoelectric path for a power supply device, a load device, and a power distribution system configured by an electric circuit that carries power between the supply device and the load device. The present invention relates to an insulation monitoring device.

  The background of monitoring the insulation state of the low-voltage circuit is the stoppage of production facilities due to sudden interruptions and prevention of electrical leakage fires and accidents. However, due to the increase in OA equipment and inverter equipment, etc. Then, the measured leakage current value is large, which may cause misjudgment in management.

  Therefore, a method for detecting Igr having the same phase component as the voltage phase from the reference voltage phase of the load circuit obtained by voltage input and the leakage current Io obtained by ZCT input has been established. In order to grasp the phase, it is necessary to input the voltage element of the load circuit to be measured.

  Also, when the voltage system of the load circuit is diversified, voltage element input is required for all systems, so it is difficult to consolidate and miniaturize the device, and a power outage is required for voltage input wiring. -There is a problem that the wiring man-hour is required (see Patent Document 1).

FIG. 1 shows an example of an insulation monitoring device, where 1 is a device housing, 2 is a voltage input unit, 3 is a ZCT input unit, 4 is a conversion unit, 5 is a setting unit, 6 is a calculation unit, 7 is a display unit, 8 is an alarm output unit, and 9 is a transmission unit. The voltage input unit 2 receives the reference voltage waveform signal of the power distribution system, the ZCT input unit 3 receives the leakage current waveform signal, the conversion unit 4 converts the phase between the signals, and the setting unit 5 The elements are set, the calculation unit 6 converts the phase between the signals according to the setting contents, calculates the leakage current from the converted signal, the display unit 7 displays the calculation result, etc., and the alarm output unit 8 outputs an alarm. The transmission unit 9 transmits calculation results and the like to the outside. FIG. 2 is a vector diagram showing means for calculating Igr from the detected reference phase voltage and zero phase current (Io).
Japanese Patent Laid-Open No. 2004-198304

  The present invention provides an insulation monitoring device that enables Igr detection of a wide variety of voltage systems from a single voltage input (a voltage element that is completely unrelated to the measurement circuit) and solves the above-mentioned problems. With the goal.

  In order to solve the above problems, in the present invention, a phase line type, connection, and voltage extraction phase of a general low-voltage circuit are tabulated, and the phase line type, connection, voltage extraction phase corresponding to one input voltage element are tabulated. Can be selected, any voltage input element is corrected to the reference voltage phase angle. Also, for the load circuit that performs ZCT input, a general phase line type, connection, and load extraction phase are tabulated and made selectable so as to grasp the theoretical phase angle with respect to the reference voltage phase angle, Various voltage systems can be detected from a single voltage input.

  That is, the present invention relates to a reference voltage waveform of a power receiving / distributing system in an insulation monitoring device that monitors a power supplying device, a load device, and a power receiving / distributing system configured by an electric circuit that carries power between the power supplying device and the load device. An input unit capable of inputting a signal and a leakage current waveform signal, a conversion unit for digitally converting both the input signals, a phase wire system of the power receiving / distributing system, a wiring system of the power receiving / distributing system, and a reference voltage waveform of the power receiving / distributing system An insulation monitoring device comprising: a setting unit that sets an input phase; and a calculation unit that converts a phase between the two digital signals according to the setting contents of the setting units and calculates a resistance leakage current from the converted digital signals. is there.

  The present invention also relates to a reference voltage waveform of a power receiving / distributing system in an insulation monitoring device that monitors a power supplying device, a load device, and a power receiving / distributing system configured by a power path that carries power between the power supplying device and the load device. An input unit capable of inputting a signal and a leakage current waveform signal, a conversion unit for digitally converting both the input signals, a phase wire system of the power receiving / distributing system, a wiring system of the power receiving / distributing system, and a reference voltage waveform of the power receiving / distributing system A setting unit for setting the input phase, and a storage in which the phase line type, the connection method, the reference voltage waveform input phase and the numerical values used during phase conversion of the power distribution system that can be assumed in advance for phase conversion between the two digital signals are tabulated And a calculation unit that converts the phases of the two digital signals using the corresponding table of the storage unit according to the setting contents of the setting unit, and calculates a resistance leakage current from the converted digital signals. It is a monitoring device.

  The present invention relates to a reference voltage waveform of a power receiving / distributing system in an insulation monitoring device that monitors a power supplying device, a load device, and a power receiving / distributing system configured by an electric circuit that carries power between the power supplying device and the load device. An input unit that can input a signal and a leakage current waveform signal, a conversion unit that digitally converts both the input signals, a phase wire system of the power receiving / distributing system, a wiring system of the power receiving / distributing system, and a load wiring phase of the power receiving / distributing system An insulation monitoring device comprising: a setting unit that sets the phase; and a calculation unit that converts the phase between the two digital signals according to the setting contents of the setting units and calculates a resistance leakage current from the converted digital signals. .

  Furthermore, the present invention provides a reference voltage waveform of a power receiving / distributing system in an insulation monitoring device that monitors a power supplying device, a load device, and a power receiving / distributing system configured by an electric circuit that carries power between the power supplying device and the load device. An input unit that can input a signal and a leakage current waveform signal, a conversion unit that digitally converts both the input signals, a phase wire system of the power receiving / distributing system, a wiring system of the power receiving / distributing system, and a load wiring phase of the power receiving / distributing system A storage unit that tabulates the phase and wire distribution system of the power distribution system that can be assumed in advance for phase conversion between the two digital signals, the connection method, the load wiring phase, and the numerical values used during phase conversion; and The insulation monitoring device includes an arithmetic unit that converts a phase between the two digital signals according to setting contents of each setting unit and calculates a resistance leakage current from the converted digital signals.

  The present invention also relates to a reference voltage waveform of a power receiving / distributing system in an insulation monitoring device that monitors a power supplying device, a load device, and a power receiving / distributing system configured by a power path that carries power between the power supplying device and the load device. An input unit that can input a signal and a leakage current waveform signal, a conversion unit that digitally converts the both input signals, a setting unit that can arbitrarily set a phase angle between the two digital signals, and a setting of each setting unit The insulation monitoring device includes a calculation unit that converts the phase between the two digital signals according to the contents and calculates a resistance leakage current from the converted digital signals.

  In the present invention, the input unit can input a plurality of leakage current waveform signals, the conversion unit digitally converts a plurality of leakage current input signals, and the calculation unit is configured according to the setting contents of the setting units. Insulation monitoring device that converts the phase between the reference voltage waveform digital signal and the plurality of leakage current digital signals for each leakage current digital signal, and calculates a resistance leakage current from the converted plurality of leakage current digital signals It is.

  According to the present invention, it is possible to measure Igr for a wide variety of phase circuit, connection, and voltage extraction phase load circuits with a single voltage input that is completely unrelated to the load for measuring Igr, and to incorporate voltage elements. Because it is possible to easily measure Igr such as power load by voltage input from a 100V outlet circuit, an insulation monitoring device should be introduced for uninterruptible power when combined with clamp type or split type ZCT. Can do.

  Furthermore, since the Igr measurement is performed on a plurality of ZCT inputs with a single voltage input, the apparatus can be integrated and reduced in size.

The best mode for carrying out the present invention will be described.
Embodiments of the insulation monitoring apparatus of the present invention will be described below with reference to the drawings and tables.

  Example 1 will be described. The insulation monitoring apparatus of the present embodiment is the same as that of the conventional example (FIG. 1), and different portions will be mainly described. FIG. 3 shows a setting unit in this embodiment, where 5a is a voltage input phase line type / connection voltage extraction phase selection table, 5b is a ZCT input phase line type / connection phase theoretical value selection table, 5c. FIG. 4 is a diagram illustrating a phase angle arbitrary input unit.

  4 (a) and 4 (b) show an example of a voltage table. For 13 to 16 phase wire types and connections, 13 three-phase three-wire star / delta connection RS line voltage phases are shown. When the reference phase is set, 14 to 16 single-phase three-wire primary side lead-out differences (14 is U-V, 15 is V-W, 16 is U-W), 14 is 30 °, 15 The correction value for the reference phase, 90 ° in the case of 16 and 150 ° in the case of 16, is tabulated and the phase voltage type, connection, and voltage extraction phase of the input voltage element can be selected, so that any voltage element can be selected. Even with input, it is possible to perform correction to the reference phase inside the apparatus.

  FIGS. 5A and 5B show an example of a phase angle table. When a voltage is input from 13 three-phase three-wire star / delta connection RS line voltage, the reference voltage phase is 13b. However, in the 14 to 16 single-phase three-wire primary side differential circuit, any phase line type can be obtained by correcting the reference voltage phase to 14b, 15b, or 16b by selecting from the phase angle table. , Igr can be measured even with the ZCT input of the load circuit connected.

  A second embodiment will be described. FIG. 6 shows a second embodiment of the present invention, and when installing a permanent or portable insulation monitoring device, it is easy to take in a live line, and by voltage input from a 100V outlet circuit. Can also measure Igr, such as a 200V power circuit.

  Although the present invention has been described in the above embodiments, preventive maintenance based on early identification of signs of insulation deterioration is an important item in preventing leakage fires and electric shock accidents, and multi-circuit integration of the insulation monitoring device of the present invention. And can contribute to miniaturization.

The block diagram which shows the outline of an insulation monitoring apparatus. The vector diagram which performs Igr detection from the voltage input and ZCT input in the conventional insulation monitoring apparatus. The block diagram which shows the setting part in the insulation monitoring apparatus of Example 1. FIG. FIG. 3 is a diagram illustrating an example of a voltage table in the first embodiment. FIG. 3 is a diagram illustrating an example of a phase angle table in the first embodiment. FIG. 6 is a signal input diagram according to the second embodiment.

Explanation of symbols

  1. 1. Insulation monitoring device main body 2. voltage input unit; 3. ZCT input unit, 4. conversion unit; Setting unit, 6. 6. arithmetic unit; Display section, 8. 8. Alarm output unit, Transmission unit, 10a · b. Transformer, 11a, b. Transformer voltage element, 12a · b, ZCT, 5a. Voltage table, 5b. Phase angle table, 5c. Phase angle arbitrary input section, 13. Three-phase three-wire transformer load, 14. 15. Single-phase three-wire transformer load (primary U-V), Single-phase three-wire transformer load (primary V-W), 16. Single-phase three-wire transformer load (primary U-W), 13a. Three-phase three-wire transformer secondary vector, 14a. Single-phase three-wire transformer (primary U-V) secondary vector, 15a. Single-phase three-wire transformer (primary VW) secondary vector, 16a. Single-phase three-wire transformer (primary U-W) secondary vector, 13b. Three-phase three-wire transformer reference voltage phase, 14b. Single-phase three-wire transformer (primary U-V) reference voltage phase, 15b. Single-phase three-wire transformer (primary VW) reference voltage phase, 16b. Single-phase three-wire transformer (primary U-W) reference voltage phase, 17.100V outlet

Claims (6)

In an insulation monitoring device for monitoring a power supply device, a load device, and a power receiving / distributing system configured by an electric circuit that conveys power between the supply device and the load device,
An input unit capable of inputting a reference voltage waveform signal and a leakage current waveform signal of the power distribution system, a conversion unit for digitally converting both the input signals, a phase line system of the power distribution system, and a connection system of the power distribution system, and A setting unit that sets the reference voltage waveform input phase of the power distribution system, and a calculation unit that converts the phase between the two digital signals according to the setting contents of the setting units, and calculates a resistance leakage current from the converted digital signals An insulation monitoring device comprising: In an insulation monitoring device for monitoring a power supply device, a load device, and a power receiving / distributing system configured by an electric circuit that conveys power between the supply device and the load device,
An input unit capable of inputting a reference voltage waveform signal and a leakage current waveform signal of the power distribution system, a conversion unit for digitally converting both the input signals, a phase line system of the power distribution system, and a connection system of the power distribution system, and Setting unit for setting the reference voltage waveform input phase of the power distribution system, and phase line type, connection method, reference voltage waveform input phase and phase conversion of the power distribution system that can be assumed in advance for phase conversion between the two digital signals The phase of the two digital signals is converted using the table corresponding to the setting of the setting unit and the table corresponding to the setting of the setting unit, and the resistance leakage current is calculated from the converted digital signals. An insulation monitoring apparatus comprising an arithmetic unit. In an insulation monitoring device for monitoring a power supply device, a load device, and a power receiving / distributing system configured by an electric circuit that conveys power between the supply device and the load device,
An input unit capable of inputting a reference voltage waveform signal and a leakage current waveform signal of the power distribution system, a conversion unit for digitally converting both the input signals, a phase line system of the power distribution system, and a connection system of the power distribution system, and A setting unit that sets the load wiring phase of the power distribution system, and a calculation unit that converts the phase between the two digital signals according to the setting contents of the setting units and calculates a resistance leakage current from the converted digital signals. An insulation monitoring device characterized by comprising. In an insulation monitoring device for monitoring a power supply device, a load device, and a power receiving / distributing system configured by an electric circuit that conveys power between the supply device and the load device,
An input unit capable of inputting a reference voltage waveform signal and a leakage current waveform signal of the power distribution system, a conversion unit for digitally converting both the input signals, a phase line system of the power distribution system, and a connection system of the power distribution system, and Table for setting the load wiring phase of the power distribution system, and the phase line type, connection method, load wiring phase, and numerical values used during phase conversion of the power distribution system that can be assumed in advance for phase conversion between the two digital signals. Insulation characterized in that it comprises a storage unit and a calculation unit that converts the phase between the two digital signals according to the setting contents of each setting unit and calculates a resistance leakage current from the two converted digital signals Monitoring device. In an insulation monitoring device for monitoring a power supply device, a load device, and a power receiving / distributing system configured by an electric circuit that conveys power between the supply device and the load device,
An input unit capable of inputting a reference voltage waveform signal and a leakage current waveform signal of a power distribution system, a conversion unit for digitally converting the both input signals, and a setting unit capable of arbitrarily setting a phase angle between the two digital signals; An insulation monitoring apparatus comprising: a calculation unit that converts a phase between the two digital signals according to setting contents of the setting units and calculates a resistance leakage current from the converted digital signals. In the insulation monitoring apparatus according to any one of claims 1 to 5,
The input unit can input a plurality of leakage current waveform signals, the conversion unit digitally converts a plurality of leakage current input signals, and the arithmetic unit is configured to convert the reference voltage waveform digital signal according to the setting contents of the setting units. And a phase between the plurality of leakage current digital signals are converted for each leakage current digital signal, and a resistance leakage current is calculated from the converted plurality of leakage current digital signals.

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