CA1254266A - Current peak meter - Google Patents
Current peak meterInfo
- Publication number
- CA1254266A CA1254266A CA000495336A CA495336A CA1254266A CA 1254266 A CA1254266 A CA 1254266A CA 000495336 A CA000495336 A CA 000495336A CA 495336 A CA495336 A CA 495336A CA 1254266 A CA1254266 A CA 1254266A
- Authority
- CA
- Canada
- Prior art keywords
- current
- voltage
- transducer
- serial
- multiplex
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
Abstract
ABSTRACT
The present invention relates to a solid-state system which can monitor and record the electric power used by individual users in existing distribution schemes such as those found in an apartment building without the need of installing separate kilowatt hour meters in each apartment unit. The present in-vention has sampling units which can read peak currents in branch lines and voltages simultaneously so that the power in a branch line can be calculated. The reading of current in a particular branch line is accomplished through a multiplex unit. Current and voltage values are converted from analogue to digital form.
This data is sent to a computer which performs operations on the data to keep track of the power used by individual users.
The present invention relates to a solid-state system which can monitor and record the electric power used by individual users in existing distribution schemes such as those found in an apartment building without the need of installing separate kilowatt hour meters in each apartment unit. The present in-vention has sampling units which can read peak currents in branch lines and voltages simultaneously so that the power in a branch line can be calculated. The reading of current in a particular branch line is accomplished through a multiplex unit. Current and voltage values are converted from analogue to digital form.
This data is sent to a computer which performs operations on the data to keep track of the power used by individual users.
Description
``` ~l2~Z~
The present invention relates to a sys-tem for remote monitoring of several different power consumers by using one host computer.
In particular, the present invention relates to a solid-state system which can monitor and record the electric power used by individual users in existing distribution schemes such as those found in an apartment building without the need of installing separate kilowatt hour meters in each apartment unit.
In many larger apartment buildings, it is not possible to correctly apportion electrical power usage on an apartment by apartment basis since each apartment does not have a separate kilowatt hour meter. In such cases, the landlord cannot charge each tennant a rental rate plus a power usage rate; the power usage must be part of the landlord's overhead. Of course, separate kilowatt hour meters could be installed for each apartment unit, but this could be quite expensive particularly where a large number of apartment units are involved. The present invention provides for a solid-state apparatus which can be used to properly apportion hydro usage on an apartment by apartment basis without the need of installing a separate kilowatt hour meter in each apartment, and at a considerable cost saving.
The present system can be broken down into four key areas; a current/voltage transducer, a sampling unit which will record measurements, a data pathway, and host computer. The ~6 125~ZD6 transducer can monitor the current ror the main hydro line as well as branch lines which will be provided to each user. At regular time intervals, the sampling unit can measure the voltage across each individual line and at the same time take a measurement f rom the current transducer. Using these two measurements, the true power being consumed at a particular instant in time can be obtained. The sampling unit can then be used to monitor and collect data from the transducers, and will be capable of sampling multiple transducers by means of multiplexing transducer signals. The host computer will be used to poll sampling units. The sampling unit will transmit collected data to the host computer when addressed by the host computer. The host computer will then identify the data and store it. The host computer must also monitor the central line feeding the distribution system. The power measured here will give the total power consumption, and this value allows the host computer to calculate the ratio of individual consumption to that of the total use. The ratios can then apportion the total bill supplied by hydro on an apartment by apartment basis. The size and configuration of the electrical distribution system will determine the number and location of the sampling devices.
In accordance with the present invention there is provided an apparatus for monitoring and apportioning electrical power consumption by a number of consumers, each consumer being provided with an unmetered branch power transmission line connected to a metered main power transmission line, including:
~ZS4~6~6 at least one sampling unit comprising i) at least one current transducer for measuring current in said branch lines at predetermined time intervals; ii) at least one voltage transducer for measuring voltage on said main transmission line;
iii) multiplex means for causing selected current signals to be transmitted to a current peak detector at predetermined time intervals; iv) timing means associated with said current peak detector for initiating voltage sis~nal sampling upon detection of a current signal peak; v) means for converting said current peak values, and corresponding voltage signal values from analog to digital form; and vi) serial/parallel interface means connected to said multiplex means (iii) and said converting means (v) for collating and transmitting serial current and voltage values for each said branch line to a Central Processing Unit.
The present invention will now be described with reference to a preferred embodiment which will be made with particular reference to the following drawins~s.
Figure 1 is a block diagram generally showing the system.
. .
- 2a -- ~S~6~
Figure lA is a detailed block diagram generally showing the complete sampling unit.
Figure 2 is a block diagram showing transducer connections.
Figure 3 is a block diagram showing the sampling unit.
Figure 4 is a diagram showing a current transducer.
Figure 5 is a circui-t diagram showing the current transducer conditioning circuit.
Figure 6 is a schematic diagram showing the voltage transducer conditioning circuit.
Figure 7 is a diagram showing the multiplexing circuit.
Figure 8 is a circuit diagram showing the current peak detector circuit.
Figure 9 shows the analog to digital converters.
Figure 10 shows the sampling unit communications interface.
Figure 11 shows the network protocol.
Referring to Figures 1 and lA, the system can generally be configured as shown. There must be at least one host computer 10, one network interface 24, and one sampling unit 12. There must also be at least one current transducer 13 per sampling unit 12, and one voltage transducer 14 per sampling unit 12. There can be as many as 128 sampling units 12, 64 current transducers 13 per sampling unit 12, and two voltage transducers 14 per sampling unit 12. As shown in Figure 2, the current transducer 13 will moni-tor the current for the main hydro lines 25 and send this information :~5~LZ~i to the sampling unit as shown in Figure 3. The voltage transducer 14 also monitors the voltage for the main hydro line 25 and provides this information to the sampling unit Figure 3. On the distribution side of maln fuse box 26, current transducers 13 are provided across each of the individual lines and will monitor the current for each of the individual lines and send this information to the sampling unit 23. The sampling unit shown in Figure 3 accepts these inputs and multiplexes input transducer signals on an apartment by apartment basis. The multiplex signals are converted from analog signals to digital signals by A/D converters 21 and 22 at specific sampling times determined by peak detector 23, and then sent into a network interface 24 between the sampling unit of Figure 3 and the host computer 10 by way of a data pathway network. The host computer 10, shown in Figure 1, can poll the sampling units, identify the data, and store it. The host computer 10 is also monitoring the central line feeding the distribution system so that it can calculate the total power consumption.
In order to measure the true power being consumed by a load, it is necessary to obtain a voltage and current representation of load conditions. It is also necessary to obtain the phase relationship between the current and voltage since if the current and voltage are not in phase, the true power consumption cannot be obtained unless the phase angle is known.
Real power can be obtained from the product of the peak to peak current with the peak to peak voltage and the cosine of the phase :1~5'~Z66 angle between the current and voltage. From this equa-tion~ it can be seen that if peak current could be measured and at the same time the voltage measured, the product of these two numbers at any instant in time will automatically give the real power since the product includes the cosine of the phase angle. Accordingly, the real power being consumed by the load is the peak current times the voltage at the same instant in time.
A current transducer can be constructed from a Siemens'n R3~ toroid 50 with 275 turns of number 26 wire as shown in Figure 4. The wire 51 through which the load current is flowing can be placed through the toroid 50, and the peak voltage that appears across the secondary of the current transformer will be proportional to the peak load current. The output of the current transducer can be interfaced to the sampling unit with a current transducer conditioning circuit such as one shown in Figure 5.
This interface circuit serves to scale the output of the transducer from zero to five volts for a primary current of from zero to one hundred amps.
A voltage transducer conditioning circuit can be constructed from a step down transformer with the primary winding connected across the load and the secondary winding interfaced to the sampling unit with a voltage transducer conditioning circuit such as that shown in Figure 6. This circuit will scale the output from zero to five volts for a load voltage of from zero to one hundred and seventy volts.
~lZ5~66 The sampling unit shown in Figure 3 serves as the interface between the current/voltage transducers (13 and 14) and the host computer 10. The sampling unit of Figure 3 has a capacity to connect to sixty-four current transducers and two voltage transducers. The basic func-tions of the sampling unit can be broken down into five components, namely a multiplexing circuit, a peak detection circuit 23, analog to digital converters 21 and 22, a communications interface 24, and control logic.
The multiplexing circuit as shown in Figure 7 is used to multiplex the signals from the current transducers 13 and voltage transducers 14 to form two signals; one for current and the other for voltage. The multiplexed current transducer signals are sent to the current peak circuit detector 23 as shown in Figure 8. The outputs from the voltage transducer circuit 31 are sent to a voltage analog to digital converter 22. The same analog to digital converter chip may be used for both the current and voltage, such as a ADC0804l~.
The current peak detector circuit 23 is shown in Figure 8, and is used to detect the peak of the multiplex current signal.
An input is accepted from the current multiplexer 30 as shown in Figure 7, and the signal output of the current peak detector 23 is used to start a current/voltage sample. The output is sent to the control logic circuit which sends a"start conversion" signal to the analog to digital converter circuit shown in Figure 9.
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The analog to digital converters shown in Figure 9 are used to conver-t the transducer signals into a binary representation that can then be transmitted to the host computer 10 for evaluation. There are two A/D converters per sampling unit, in order to digitize the current and voltage signals simultaneously, and thus enabling the real power equation to be used. The resolution of the A/D converters, in the preferred embodiment is 8 bits which transforms, for a current resolution of approximately .75 amps, and for a voltage resolution of approximately 1 volt. The outputs from the A/D converters are seni to the network interface shown in Figure 10. Of course, the resolution can be 16 bits by obvious software modifications and changing the A/D converters.
Figure 10 shows the sampling uni-t communications interface. The communications interface serves as a link to the host computer 10. The interface has the capability of being addressed by the host computer 10 to allow the host 10 to talk to a maximum of 128 sampling units. The sampling unit communications interface circuit in Figure 10 contains a 6.144 megahertz crystal which is divided to provide a 307.2 kilohertz clock pulse. Using a demultiplexer circuit, individual signals which were multiplexed can be sampled. The host computer, supplied by the end user, must have a user programmable serial port, such as an APPLE'~ II+, an IBM'~PC, or a COMMOnORE'~ 64.
~ZS~ 6, The host computer lO serves as the data collection nucleus of the I-peak system of the present invention. The host computer 10 consists of two major components, a network interface and a host I-peak software. The network interface interfaces the host computer to the sampling units. This interface in the preferred embodiment is a four wire full duplex interface configured to operate with eight bits data, even parity bit, start and stop bit and a transmission rate of 4800 bits per second. The communications protocol for the network is implementad in software such as that shown in Figure 11. The data received from the sampling units is uncalibrated data and thus must be manipulated to obtain a true wattage figure from the current voltage data.
This can be done in obvious ways.
During operation, the following sequence of events takes place.
1. The host computer places an address on the serial line which enables the sampling unit with the same address.
The present invention relates to a sys-tem for remote monitoring of several different power consumers by using one host computer.
In particular, the present invention relates to a solid-state system which can monitor and record the electric power used by individual users in existing distribution schemes such as those found in an apartment building without the need of installing separate kilowatt hour meters in each apartment unit.
In many larger apartment buildings, it is not possible to correctly apportion electrical power usage on an apartment by apartment basis since each apartment does not have a separate kilowatt hour meter. In such cases, the landlord cannot charge each tennant a rental rate plus a power usage rate; the power usage must be part of the landlord's overhead. Of course, separate kilowatt hour meters could be installed for each apartment unit, but this could be quite expensive particularly where a large number of apartment units are involved. The present invention provides for a solid-state apparatus which can be used to properly apportion hydro usage on an apartment by apartment basis without the need of installing a separate kilowatt hour meter in each apartment, and at a considerable cost saving.
The present system can be broken down into four key areas; a current/voltage transducer, a sampling unit which will record measurements, a data pathway, and host computer. The ~6 125~ZD6 transducer can monitor the current ror the main hydro line as well as branch lines which will be provided to each user. At regular time intervals, the sampling unit can measure the voltage across each individual line and at the same time take a measurement f rom the current transducer. Using these two measurements, the true power being consumed at a particular instant in time can be obtained. The sampling unit can then be used to monitor and collect data from the transducers, and will be capable of sampling multiple transducers by means of multiplexing transducer signals. The host computer will be used to poll sampling units. The sampling unit will transmit collected data to the host computer when addressed by the host computer. The host computer will then identify the data and store it. The host computer must also monitor the central line feeding the distribution system. The power measured here will give the total power consumption, and this value allows the host computer to calculate the ratio of individual consumption to that of the total use. The ratios can then apportion the total bill supplied by hydro on an apartment by apartment basis. The size and configuration of the electrical distribution system will determine the number and location of the sampling devices.
In accordance with the present invention there is provided an apparatus for monitoring and apportioning electrical power consumption by a number of consumers, each consumer being provided with an unmetered branch power transmission line connected to a metered main power transmission line, including:
~ZS4~6~6 at least one sampling unit comprising i) at least one current transducer for measuring current in said branch lines at predetermined time intervals; ii) at least one voltage transducer for measuring voltage on said main transmission line;
iii) multiplex means for causing selected current signals to be transmitted to a current peak detector at predetermined time intervals; iv) timing means associated with said current peak detector for initiating voltage sis~nal sampling upon detection of a current signal peak; v) means for converting said current peak values, and corresponding voltage signal values from analog to digital form; and vi) serial/parallel interface means connected to said multiplex means (iii) and said converting means (v) for collating and transmitting serial current and voltage values for each said branch line to a Central Processing Unit.
The present invention will now be described with reference to a preferred embodiment which will be made with particular reference to the following drawins~s.
Figure 1 is a block diagram generally showing the system.
. .
- 2a -- ~S~6~
Figure lA is a detailed block diagram generally showing the complete sampling unit.
Figure 2 is a block diagram showing transducer connections.
Figure 3 is a block diagram showing the sampling unit.
Figure 4 is a diagram showing a current transducer.
Figure 5 is a circui-t diagram showing the current transducer conditioning circuit.
Figure 6 is a schematic diagram showing the voltage transducer conditioning circuit.
Figure 7 is a diagram showing the multiplexing circuit.
Figure 8 is a circuit diagram showing the current peak detector circuit.
Figure 9 shows the analog to digital converters.
Figure 10 shows the sampling unit communications interface.
Figure 11 shows the network protocol.
Referring to Figures 1 and lA, the system can generally be configured as shown. There must be at least one host computer 10, one network interface 24, and one sampling unit 12. There must also be at least one current transducer 13 per sampling unit 12, and one voltage transducer 14 per sampling unit 12. There can be as many as 128 sampling units 12, 64 current transducers 13 per sampling unit 12, and two voltage transducers 14 per sampling unit 12. As shown in Figure 2, the current transducer 13 will moni-tor the current for the main hydro lines 25 and send this information :~5~LZ~i to the sampling unit as shown in Figure 3. The voltage transducer 14 also monitors the voltage for the main hydro line 25 and provides this information to the sampling unit Figure 3. On the distribution side of maln fuse box 26, current transducers 13 are provided across each of the individual lines and will monitor the current for each of the individual lines and send this information to the sampling unit 23. The sampling unit shown in Figure 3 accepts these inputs and multiplexes input transducer signals on an apartment by apartment basis. The multiplex signals are converted from analog signals to digital signals by A/D converters 21 and 22 at specific sampling times determined by peak detector 23, and then sent into a network interface 24 between the sampling unit of Figure 3 and the host computer 10 by way of a data pathway network. The host computer 10, shown in Figure 1, can poll the sampling units, identify the data, and store it. The host computer 10 is also monitoring the central line feeding the distribution system so that it can calculate the total power consumption.
In order to measure the true power being consumed by a load, it is necessary to obtain a voltage and current representation of load conditions. It is also necessary to obtain the phase relationship between the current and voltage since if the current and voltage are not in phase, the true power consumption cannot be obtained unless the phase angle is known.
Real power can be obtained from the product of the peak to peak current with the peak to peak voltage and the cosine of the phase :1~5'~Z66 angle between the current and voltage. From this equa-tion~ it can be seen that if peak current could be measured and at the same time the voltage measured, the product of these two numbers at any instant in time will automatically give the real power since the product includes the cosine of the phase angle. Accordingly, the real power being consumed by the load is the peak current times the voltage at the same instant in time.
A current transducer can be constructed from a Siemens'n R3~ toroid 50 with 275 turns of number 26 wire as shown in Figure 4. The wire 51 through which the load current is flowing can be placed through the toroid 50, and the peak voltage that appears across the secondary of the current transformer will be proportional to the peak load current. The output of the current transducer can be interfaced to the sampling unit with a current transducer conditioning circuit such as one shown in Figure 5.
This interface circuit serves to scale the output of the transducer from zero to five volts for a primary current of from zero to one hundred amps.
A voltage transducer conditioning circuit can be constructed from a step down transformer with the primary winding connected across the load and the secondary winding interfaced to the sampling unit with a voltage transducer conditioning circuit such as that shown in Figure 6. This circuit will scale the output from zero to five volts for a load voltage of from zero to one hundred and seventy volts.
~lZ5~66 The sampling unit shown in Figure 3 serves as the interface between the current/voltage transducers (13 and 14) and the host computer 10. The sampling unit of Figure 3 has a capacity to connect to sixty-four current transducers and two voltage transducers. The basic func-tions of the sampling unit can be broken down into five components, namely a multiplexing circuit, a peak detection circuit 23, analog to digital converters 21 and 22, a communications interface 24, and control logic.
The multiplexing circuit as shown in Figure 7 is used to multiplex the signals from the current transducers 13 and voltage transducers 14 to form two signals; one for current and the other for voltage. The multiplexed current transducer signals are sent to the current peak circuit detector 23 as shown in Figure 8. The outputs from the voltage transducer circuit 31 are sent to a voltage analog to digital converter 22. The same analog to digital converter chip may be used for both the current and voltage, such as a ADC0804l~.
The current peak detector circuit 23 is shown in Figure 8, and is used to detect the peak of the multiplex current signal.
An input is accepted from the current multiplexer 30 as shown in Figure 7, and the signal output of the current peak detector 23 is used to start a current/voltage sample. The output is sent to the control logic circuit which sends a"start conversion" signal to the analog to digital converter circuit shown in Figure 9.
~L2S~
The analog to digital converters shown in Figure 9 are used to conver-t the transducer signals into a binary representation that can then be transmitted to the host computer 10 for evaluation. There are two A/D converters per sampling unit, in order to digitize the current and voltage signals simultaneously, and thus enabling the real power equation to be used. The resolution of the A/D converters, in the preferred embodiment is 8 bits which transforms, for a current resolution of approximately .75 amps, and for a voltage resolution of approximately 1 volt. The outputs from the A/D converters are seni to the network interface shown in Figure 10. Of course, the resolution can be 16 bits by obvious software modifications and changing the A/D converters.
Figure 10 shows the sampling uni-t communications interface. The communications interface serves as a link to the host computer 10. The interface has the capability of being addressed by the host computer 10 to allow the host 10 to talk to a maximum of 128 sampling units. The sampling unit communications interface circuit in Figure 10 contains a 6.144 megahertz crystal which is divided to provide a 307.2 kilohertz clock pulse. Using a demultiplexer circuit, individual signals which were multiplexed can be sampled. The host computer, supplied by the end user, must have a user programmable serial port, such as an APPLE'~ II+, an IBM'~PC, or a COMMOnORE'~ 64.
~ZS~ 6, The host computer lO serves as the data collection nucleus of the I-peak system of the present invention. The host computer 10 consists of two major components, a network interface and a host I-peak software. The network interface interfaces the host computer to the sampling units. This interface in the preferred embodiment is a four wire full duplex interface configured to operate with eight bits data, even parity bit, start and stop bit and a transmission rate of 4800 bits per second. The communications protocol for the network is implementad in software such as that shown in Figure 11. The data received from the sampling units is uncalibrated data and thus must be manipulated to obtain a true wattage figure from the current voltage data.
This can be done in obvious ways.
During operation, the following sequence of events takes place.
1. The host computer places an address on the serial line which enables the sampling unit with the same address.
2. The host computer then issues a command to select which current and voltage transducer are to be sampled.
3. The serial/parallel interface IC on the sampling unit sends the command to the multiplex control section of the board (see Figure 2).
~Z5~Z~i6
~Z5~Z~i6
4. The multiplex control turns on the selected current and voltage demultiplexer circuit.
5. The selected current signal is sent to the current peak detector.
6. The current peak detector uses the sample timing control circuit to activate the current and voltage A/D
converters when the current reaches its peak within a cycle.
converters when the current reaches its peak within a cycle.
7. The A/D converters convert their input analog signals to an eight bit digital signal and places the signal at the inputs of the serial/parallel convertor.
8. The conversion process must last for 16.7 milliseconds to ensure that a current peak has been attained.
9. The conversion duration is timed by the computer. At the end of the delay, the host computer issues a second command to the selected sampling unit.
10. This second command causes the serial/parallel interface IC to convert the current and voltage da-ta to serial format and send it to the host computer.
54Z6t6
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11. When the serial data is sent to the host computer, the sampling unit disables itself, so the host computer must now issue another address to repeat the sampling procedure using another transducer.
The system just described provldes an eight bit conversion of voltage and current that may be usecl by the host computer to calculate instantaneous power. If the customer required a higher resolution (i.e. 16 bits), this cou]d be accomplished by changing the A/D converters and modifying the software in the host computer to accommodate the extra data transfers required.
With the scheme described above, 32 separate power sources could be monitored by one sampling unit and 128 sampling units could be monitored on one serial I/O port of the host computer.
The system just described provldes an eight bit conversion of voltage and current that may be usecl by the host computer to calculate instantaneous power. If the customer required a higher resolution (i.e. 16 bits), this cou]d be accomplished by changing the A/D converters and modifying the software in the host computer to accommodate the extra data transfers required.
With the scheme described above, 32 separate power sources could be monitored by one sampling unit and 128 sampling units could be monitored on one serial I/O port of the host computer.
Claims (7)
1. Apparatus for monitoring and apportioning electrical power consumption by a number of consumers, each consumer being provided with an unmetered branch power transmission line connected to a metered main power transmission line, including:
at least one sampling unit comprising i) at least one current transducer for measuring current in said branch lines at predetermined time intervals;
ii) at least one voltage transducer for measuring voltage on said main transmission line;
iii) multiplex means for causing selected current signals to be transmitted to a current peak detector at predetermined time intervals;
iv) timing means associated with said current peak detector for initiating voltage signal sampling upon detection of a current signal peak;
v) means for converting said current peak values, and corresponding voltage signal values from analog to digital form; and vi) serial/parallel interface means connected to said multiplex means (iii) and said converting means (v) for collating and transmitting serial current and voltage values for each said branch line to a Central Processing Unit.
at least one sampling unit comprising i) at least one current transducer for measuring current in said branch lines at predetermined time intervals;
ii) at least one voltage transducer for measuring voltage on said main transmission line;
iii) multiplex means for causing selected current signals to be transmitted to a current peak detector at predetermined time intervals;
iv) timing means associated with said current peak detector for initiating voltage signal sampling upon detection of a current signal peak;
v) means for converting said current peak values, and corresponding voltage signal values from analog to digital form; and vi) serial/parallel interface means connected to said multiplex means (iii) and said converting means (v) for collating and transmitting serial current and voltage values for each said branch line to a Central Processing Unit.
2. An apparatus as defined in Claim 1 wherein each said sampling unit comprises from 2 to 64 current transducers, and at least one current transducer demultiplexer; each current transducer demultiplexer receiving one or more current signals, and being provided with at least one gate circuit, each said current transducer being connected to a said gate circuit; and each said gate circuit being further connected to an input from said multiplex means (iii) and an output to said current peak detector, said gate circuit permitting transmission of a current signal to a said current peak detector if, and only if, an enabling signal is received from said multiplex means (iii).
3. An apparatus as defined in Claim 2 wherein said serial/parallel interface means is connected to said multiplex means by a plurality of multiplex control lines, each said multiplex control line being capable of carrying multiplexed signal for enabling a plurality of said gate circuits.
4. An apparatus as defined in Claim 3 wherein said timing means comprises a timing control circuit having an input connected to said current peak detector and an output connected to said serial/parallel interface means, and a sample timing clock having an input connected from said serial/parallel interface and an output connected to a voltage A/D converter, said voltage A/D
converter being connected to said voltage transducer for continuous monitoring of said voltage signal and continuous translation of said voltage signal from analog to digital.
converter being connected to said voltage transducer for continuous monitoring of said voltage signal and continuous translation of said voltage signal from analog to digital.
5. An apparatus as defined in Claim 4 wherein the output from said current peak detector is transmitted to a current A/D
converter, and the output from each of said A/D converters is transmitted, as 11 bit words, via said serial/parallel interface to a Central Processing Unit.
converter, and the output from each of said A/D converters is transmitted, as 11 bit words, via said serial/parallel interface to a Central Processing Unit.
6. An apparatus as defined in Claim 5, wherein each said demultiplexer includes eight said gate circuits.
7. An apparatus as defined in Claim 4, 5 or 6 including from 1 to 128 said sampling units, connected to a network interface circuit, said network interface circuit connecting said sample units to said Central Processing Unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000495336A CA1254266A (en) | 1985-11-14 | 1985-11-14 | Current peak meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000495336A CA1254266A (en) | 1985-11-14 | 1985-11-14 | Current peak meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1254266A true CA1254266A (en) | 1989-05-16 |
Family
ID=4131890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000495336A Expired CA1254266A (en) | 1985-11-14 | 1985-11-14 | Current peak meter |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1254266A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104126128A (en) * | 2011-12-20 | 2014-10-29 | 施耐德电器工业公司 | Method for determining a power consumption, monitoring system and electrical installation comprising the application thereof |
| CN104569574A (en) * | 2013-10-16 | 2015-04-29 | 施耐德电器工业公司 | Method for determining an individual power consumption |
-
1985
- 1985-11-14 CA CA000495336A patent/CA1254266A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104126128A (en) * | 2011-12-20 | 2014-10-29 | 施耐德电器工业公司 | Method for determining a power consumption, monitoring system and electrical installation comprising the application thereof |
| CN104569574A (en) * | 2013-10-16 | 2015-04-29 | 施耐德电器工业公司 | Method for determining an individual power consumption |
| CN104569574B (en) * | 2013-10-16 | 2019-07-12 | 施耐德电器工业公司 | Method for determining individual power consumption |
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