WO2001027640A1 - Method to control the apparatus for measurement of electrical quantities through measurement cable - Google Patents

Method to control the apparatus for measurement of electrical quantities through measurement cable Download PDF

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Publication number
WO2001027640A1
WO2001027640A1 PCT/SI2000/000021 SI0000021W WO0127640A1 WO 2001027640 A1 WO2001027640 A1 WO 2001027640A1 SI 0000021 W SI0000021 W SI 0000021W WO 0127640 A1 WO0127640 A1 WO 0127640A1
Authority
WO
WIPO (PCT)
Prior art keywords
measuring apparatus
cable
measurement
frequency
control
Prior art date
Application number
PCT/SI2000/000021
Other languages
French (fr)
Inventor
Jože ARH
Original Assignee
Metrel D.D. Merilna In Regulacijska Oprema
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metrel D.D. Merilna In Regulacijska Oprema filed Critical Metrel D.D. Merilna In Regulacijska Oprema
Priority to AU79809/00A priority Critical patent/AU7980900A/en
Publication of WO2001027640A1 publication Critical patent/WO2001027640A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G01R1/06—Measuring leads; Measuring probes
    • G01R1/067—Measuring probes

Definitions

  • Base of this new method is that every command is represented with high frequency current, whose base frequency is characteristic for that command and frequency band of control signal is far away from frequency band of measuring signal and standard cable that connects measuring apparatus to measured object is also used for transferring of control signals.
  • High frequency current generator is started with known base frequency that corresponds to selected command and this current is inserted using transformer 402 into current loop that consists of conductor 3, transformer 402, capacitor 401, conductor 1, capacitor
  • Transformer 202 brings control signal form mentioned current loop through signal former 203 to frequency measurement part of control unit 205.
  • Control unit 205 decides according to the result of measured frequency realise received command in the same manner as with its switch array 204.
  • Inductive coupling on input and output side enable using of the standard cable that connect measuring apparatus with measured object without any risk for operator and measuring apparatus.
  • Some standard control commands are start of measurement, save of measured results etc.
  • Measuring apparatus for electrical quantities like voltage, line internal impedance, insulation resistance of mains installation has build in unit 2 that consists of: transformer 202, signal former 203, control unit 205, switch array 204 and capacitor 201.
  • Control signal (command) received from transformer 202 is amplified wave formed in signal former 203 so the frequency measuring part can measure its base frequency.
  • Control unit 205 that decides according to measured frequency activates appropriate electronic switch from switch array 204 to realise received command.
  • (Remote) control unit 4 consists of keypad 404. oscillator unit 403. transformer 402, and capacitor 401. This unit is connected to measuring apparatus with standard cable consisting of conductors 1 and 3.
  • Control unit contains also probe tip or plug for connection to measured object. Pressing a key of keypad enables to oscillate the oscillator unit 403 to generate alternating current with base frequency according to activation command. This current is inserted in closed loop: 402-3-202-201-1-401 using transformer
  • the source of high frequency current is standard oscillator circuit realised with operational amplifiers and/or standard CMOS logic devices.
  • Described method enables galvanic insulation of (remote) control unit 4 from measuring path and using standard cables. There is no or minimal crosstalk of control signal to measurements due to using of different frequency band.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

Method of remote control of measuring apparatus for electrical quantities through cable that connects the measuring apparatus with measured object use high frequency current representation of commands with characteristic base frequencies and transfer them using cable that connects measuring apparatus with measured object. Currents are injected and take of using inductive coupling with transformers (402) and (202). Control unit (205) measures base frequencies of received commands and realise them based on measured frequency through decision circuit and turning appropriate switches (204).

Description

METHOD TO CONTROL THE APPARATUS FOR MEASUREMENT OF ELECTRICAL QUANTITIES THROUGH MEASUREMENT CABLE
Technical problem
Technical problem solved
Figure imgf000002_0001
this innovation is method for controlling the apparatus for measurement of electrical quantities using interface with cable for connection of mentioned apparatus to measured object.
State of art
Transfers of control signals using cable interface are described in patent documents JP102821 180A, US4672306 and US5293122. Main disadvantages of those mentioned solutions are for the applications special produced cables, and/or no galvanic separation between control and measurement parts. Typical application of the method is measuring electrical quantities of house mains installation where it is sometimes necessary that an operator has one hand free. It is has to be also taken into account that there are hazardous live measured voltages.
Description of the new solution
Base of this new method is that every command is represented with high frequency current, whose base frequency is characteristic for that command and frequency band of control signal is far away from frequency band of measuring signal and standard cable that connects measuring apparatus to measured object is also used for transferring of control signals.
The method has the following procedure: High frequency current generator is started with known base frequency that corresponds to selected command and this current is inserted using transformer 402 into current loop that consists of conductor 3, transformer 402, capacitor 401, conductor 1, capacitor
201 and transformer 202. Transformer 202 brings control signal form mentioned current loop through signal former 203 to frequency measurement part of control unit 205. Control unit 205 decides according to the result of measured frequency realise received command in the same manner as with its switch array 204.
Inductive coupling on input and output side enable using of the standard cable that connect measuring apparatus with measured object without any risk for operator and measuring apparatus.
Some standard control commands are start of measurement, save of measured results etc.
Following is description of example application (figure 1) to prove the method.
Measuring apparatus for electrical quantities like voltage, line internal impedance, insulation resistance of mains installation has build in unit 2 that consists of: transformer 202, signal former 203, control unit 205, switch array 204 and capacitor 201. Control signal (command) received from transformer 202 is amplified wave formed in signal former 203 so the frequency measuring part can measure its base frequency. Control unit 205 that decides according to measured frequency activates appropriate electronic switch from switch array 204 to realise received command. (Remote) control unit 4 consists of keypad 404. oscillator unit 403. transformer 402, and capacitor 401. This unit is connected to measuring apparatus with standard cable consisting of conductors 1 and 3. Control unit contains also probe tip or plug for connection to measured object. Pressing a key of keypad enables to oscillate the oscillator unit 403 to generate alternating current with base frequency according to activation command. This current is inserted in closed loop: 402-3-202-201-1-401 using transformer
402 and received in signal former 203 using transformer 203.
The source of high frequency current is standard oscillator circuit realised with operational amplifiers and/or standard CMOS logic devices.
Current loop that transfers control signals is closed using capacitors 401 and 201.
Described method enables galvanic insulation of (remote) control unit 4 from measuring path and using standard cables. There is no or minimal crosstalk of control signal to measurements due to using of different frequency band.
With normal cost of application it is possible to get approximately 10% resolution on commands base frequency. This means that minimum resolution on frequency of commands is 3800Hz for base frequency of 38kHz.

Claims

Claim
Method of remote control of measuring apparatus for electrical quantities through cable that connects the measuring apparatus with measured object characterised in that using transformer (402) to inject high frequency current with characteristic base frequency into a closed loop consisting of cable conductors (1), (3) connecting measuring apparatus to measured object, and transferring this high frequency current signal through transformer (202) to signal former (203) and after that to frequency measurement part of control unit (205) that realise received command through decision circuit and switches (204) based on result of measured frequency.
PCT/SI2000/000021 1999-10-13 2000-10-11 Method to control the apparatus for measurement of electrical quantities through measurement cable WO2001027640A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU79809/00A AU7980900A (en) 1999-10-13 2000-10-11 Method to control the apparatus for measurement of electrical quantities throughmeasurement cable

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SI9900235A SI20440A (en) 1999-10-13 1999-10-13 Operating procedure for the power quantities measuring device with the help of a cable, which links the measurement device to the measured object
SIP-9900235 1999-10-13

Publications (1)

Publication Number Publication Date
WO2001027640A1 true WO2001027640A1 (en) 2001-04-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SI2000/000021 WO2001027640A1 (en) 1999-10-13 2000-10-11 Method to control the apparatus for measurement of electrical quantities through measurement cable

Country Status (4)

Country Link
AU (1) AU7980900A (en)
DE (1) DE10001143A1 (en)
SI (1) SI20440A (en)
WO (1) WO2001027640A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024010511A1 (en) * 2022-07-06 2024-01-11 Megger Sweden Ab Method, assembly and sense unit for measuring the frequency response of a plurality of electrical objects

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3702296A1 (en) * 1987-01-27 1988-08-04 Philips Patentverwaltung Arrangement for testing assemblies by means of an automatic program-controlled tester

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3702296A1 (en) * 1987-01-27 1988-08-04 Philips Patentverwaltung Arrangement for testing assemblies by means of an automatic program-controlled tester

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024010511A1 (en) * 2022-07-06 2024-01-11 Megger Sweden Ab Method, assembly and sense unit for measuring the frequency response of a plurality of electrical objects

Also Published As

Publication number Publication date
DE10001143A1 (en) 2001-05-17
SI20440A (en) 2001-06-30
AU7980900A (en) 2001-04-23

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