CN106997002B - Circuit structure and method for measuring PT secondary circuit voltage drop and load - Google Patents
Circuit structure and method for measuring PT secondary circuit voltage drop and load Download PDFInfo
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- CN106997002B CN106997002B CN201710351503.7A CN201710351503A CN106997002B CN 106997002 B CN106997002 B CN 106997002B CN 201710351503 A CN201710351503 A CN 201710351503A CN 106997002 B CN106997002 B CN 106997002B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
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Abstract
The invention discloses a circuit structure and a measuring method for measuring PT secondary circuit voltage drop and load, wherein a first voltage measuring module and a first current measuring module are arranged at the input end of a voltage drop eliminating device, the first voltage measuring module is connected with a first AD conversion module, and the first AD conversion module is connected with a first voltage phase detection module; the first current measurement module is connected with the second AD conversion module; the output end of the voltage drop eliminating device is provided with a second voltage measuring module and a second current measuring module, the second voltage measuring module is connected with a fourth AD conversion module, and the fourth AD conversion module is connected with a second voltage phase detection module; the second current measuring module is connected with the third AD conversion module, and the first voltage phase detecting module, the second AD conversion module, the third AD conversion module and the second voltage phase detecting module are connected with the CPU module; the defect that the differential measurement method directly measures or indirectly measures the PT secondary circuit pressure drop by the main machine measuring method and the auxiliary machine measuring method is overcome.
Description
Technical Field
The invention belongs to PT secondary circuit pressure drop elimination, monitoring and measuring technology; and particularly relates to a circuit structure and a measuring method for measuring PT secondary circuit voltage drop and load.
Background
In order to effectively reduce the pressure drop of PT secondary circuits of various electric energy metering devices specified in DL/T448-2000 electric energy metering management technical management regulations, the adoption of the method is currently adopted in ChinaThe voltage drop eliminating device is produced by a voltage follower principle and used for eliminating the voltage drop of the PT secondary circuit; in order to eliminate the PT secondary circuit voltage drop and ensure the PT metering precision, a precise resistance module matched with the impedance of the electric energy meter is connected in parallel at the PT outlet end, so that the method is effective. The resistor module and the voltage follower module are switched in the PT secondary circuit at the same time to form a voltage drop eliminating device functional device module for accurately eliminating voltage drop and protecting the original metering circuit, and the resistance value Zx of the equivalent resistor accords with the following formula: zx=z+z 2 Zin, wherein Z represents the impedance of the electric energy meter, zin represents the impedance of the input end of the voltage follower module, and the electric energy meter is equivalent to running at the PT end; as shown in fig. 1.
The allowable range and the measurement period of the PT secondary circuit voltage drop of various electric energy metering devices are specified in DL/T448-2000 electric energy metering management technical management regulations. The current special PT secondary circuit pressure drop measuring instrument mostly adopts a differential measuring method to directly measure or indirectly measure a master machine and a slave machine, as shown in figure 2.
When the measuring method is used for direct measurement, a worker holds a work ticket to a transformer substation site to perform measurement work. The following problems exist in the actual measurement operation:
(1) The manual work is difficult to measure continuously, the data for analysis is few, and the work efficiency is low.
(2) Each time the measurement is performed, the stranded shielding cable is manually wound and unwound on site, and potential safety hazards exist.
(3) The stranded shielded cable must be insulation tested before each measurement connection at each measurement point.
(4) Each time of measurement, the time for measuring and acquiring data is greatly less than the time of on-site wiring, coiling and uncoiling of the stranded shielding cable, insulation test of the stranded shielding cable and defect elimination.
(5) Most of the data calculation functions are provided, and data analysis is required to be performed manually.
The indirect master and slave measurement method solves the problems of (2) (3) (4) (5) directly measured by the differential measurement method, but brings new problems in the actual measurement work:
(1) The radio communication site is easy to be interfered, and the staff site must repeatedly search the position of the radio antenna capable of guaranteeing the communication; the master and slave GPS sites must track the communication satellites separately to make measurements.
(2) The equipment must be configured by a master machine and a slave machine, the master machine is used as a core for measuring and data processing, fault measurement cannot be completed, and the equipment security is not high;
(3) Because the master machine and the slave machine are matched, the equipment is repeatedly purchased.
Whether the differential measurement method is used for direct measurement or the indirect master and slave measurement method is used for measuring the PT secondary circuit pressure drop, workers must hold work tickets, carry measurement equipment and take transportation means to the transformer substation site for measurement, the working time of the road and the site is long, and the working cost is high.
The invention comprises the following steps:
the invention aims to solve the technical problems: the circuit structure and the measuring method for measuring the PT secondary circuit voltage drop and the load are provided, so that the technical problems that in the prior art, the PT secondary circuit voltage drop is measured directly by adopting a measuring method or is measured by adopting an indirect master-slave measuring method, workers must hold a work ticket, carry measuring equipment, take a transportation means to a transformer substation site to carry out measuring work, the working time of the way and the site is long, the working cost is high and the like are solved.
The technical scheme of the invention is as follows:
the circuit structure for measuring the PT secondary circuit voltage drop and load comprises a voltage drop eliminating device, wherein the input end of the voltage drop eliminating device is connected with the PT secondary circuit, and the output end of the voltage drop eliminating device is connected with an electric energy meter; the input end of the voltage drop eliminating device is provided with a first voltage measurement PT1 module and a first current measurement CT1 module, the first voltage measurement PT1 module is connected with a first AD conversion module, and the first AD conversion module is connected with a first voltage and phase detection module; the first current measurement CT1 module is connected with the second AD conversion module, and the first voltage, the phase detection module and the second AD conversion module are respectively connected with the CPU module; the output end of the voltage drop eliminating device is provided with a second voltage measurement PT2 module and a second current measurement CT2 module, the second voltage measurement PT2 module is connected with a fourth AD conversion module, and the fourth AD conversion module is connected with a second voltage and phase detection module; the second current measurement CT2 module is connected with the third AD conversion module, and the third AD conversion module, the second voltage and the phase detection module are respectively connected with the CPU module.
The CPU module is connected with the display module.
The CPU module is connected with the communication module; the communication module is connected with the system master station.
The voltage drop eliminating device is based on the principle of a voltage follower.
The measuring method for the circuit structure for measuring the PT secondary circuit voltage drop and load comprises the following steps:
loop pressure drop and load measurement in pressure drop cancellation mode: when the pressure drop device is put into operation and works normally, the CPU module is controlled by on-site manual or remote instructions to measure the pressure drop and load of the PT secondary circuit; the first voltage measurement PT1 module measures a group of voltage vectors U at the same time scale I The second voltage measurement PT2 module measures a set of voltage vectors U O Vector U of voltage I And U O Performing voltage amplitude and voltage phase calculation in a voltage amplitude and phase detection module after A/D conversion to obtain the ratio difference, angle difference and voltage difference of the voltage vectors of the head end and the tail end of the PT secondary loop and the PT output end of the PT secondary loop in the voltage drop elimination mode; meanwhile, the first current measurement CT1 module measures the front-end current I of the PT secondary circuit voltage drop eliminating device I The second current measurement CT2 module measures the current I at the rear end of the PT secondary circuit voltage drop eliminating device O From V I *I I Calculating to obtain the front load and V of the PT secondary circuit pressure drop eliminating device I Is U (U) I Amplitude value; from V O *I O Calculating to obtain the back-end load, V of the PT secondary circuit pressure drop eliminating device O Is U (U) O Amplitude values.
The measuring method for the circuit structure for measuring the PT secondary circuit voltage drop and load further comprises the following steps:
PT secondary loop pressure drop and load measurement in the as-is mode: when the pressure drop device is out of operation, the on-site manual or remote instruction control CPU module measures the pressure drop and load of the original PT secondary circuit; the first voltage measurement PT1 module of the voltage under the same time scale measures a group ofVoltage vector U I The second voltage measurement PT2 module measures a set of voltage vectors U O Vector U of voltage I And U O Performing voltage amplitude and voltage phase calculation in a voltage amplitude and phase detection module after A/D conversion to obtain the ratio difference, angle difference and voltage difference of the voltage vectors of the head end and the tail end of the original PT secondary loop and the PT output end; meanwhile, the first current measuring CT1 module measures PT secondary circuit current I I From V I *I I And calculating to obtain the PT secondary circuit load.
The CPU module collects U I And U O ，I I And I O And then monitoring the PT secondary circuit.
The invention has the beneficial effects that:
according to the invention, a voltage sampling module is added at the head end of the PT secondary circuit, a current sampling module is added at the input end of a voltage drop eliminating device based on a voltage follower principle, a voltage sampling module and a current sampling module are respectively added at the outlet end of the voltage drop eliminating device, and the voltage and the current of the head end of the PT secondary circuit, the voltage and the current of the tail end of the PT secondary circuit are respectively measured. The whole device consists of a voltage sampling module, a voltage and phase detection module, a CPU module, a display module and a communication module; wherein the CPU module, the display module and the communication module can be shared with the functional module of the voltage drop eliminating device; the CPU module can implement on-line measurement of the pressure drop and the load of the PT secondary circuit according to the set time or the on-site instruction or the remote instruction, and monitor the working condition of the PT secondary circuit in real time. All the measured data are displayed on site or transmitted to a system main station in real time for processing.
The invention provides a new device for PT secondary circuit pressure drop measurement. The novel device solves the problems of time and labor waste, potential safety hazard and low efficiency in the current PT secondary circuit pressure drop and load measurement work.
The invention fully utilizes the public circuit resource of the voltage drop eliminating device, adds a voltage sampling module at the head end of the PT secondary circuit, adds a current sampling module at the input end of the voltage drop eliminating device, adds a voltage sampling module at the output end of the voltage drop eliminating device, and adds a current sampling module at the output end of the voltage drop eliminating device, thus realizing online measurement of the voltage drop and load of the PT secondary circuit through A/D conversion and voltage and phase detection modules and simultaneously realizing monitoring of the working condition of the PT secondary circuit.
The invention can remotely realize unmanned automatic measurement, and save a great deal of labor, transportation and travel costs. The measurement working period can be shortened, and a technical means is provided for changing PT secondary circuit measurement work management.
The cost of realizing the measuring function is greatly reduced.
The technical problems that in the prior art, a differential measurement method is adopted to directly measure or an indirect master-slave measurement method is adopted to measure PT secondary circuit pressure drop, workers must hold work tickets, carry measurement equipment, take vehicles to a transformer substation site to carry out measurement work, the working time of the way and the site is long, the working cost is high and the like are solved.
Description of the drawings:
FIG. 1 is a schematic diagram of a voltage drop cancellation device based on the voltage follower principle;
FIG. 2 is a schematic diagram of PT secondary circuit pressure drop measurement;
FIG. 3 is a schematic diagram of the structure of the present invention.
The specific embodiment is as follows:
the circuit structure for measuring PT secondary circuit voltage drop and load (see figure 3) comprises a voltage drop eliminating device, wherein the input end of the voltage drop eliminating device is connected with the PT secondary circuit, and the output end of the voltage drop eliminating device is connected with an electric energy meter; the input end of the voltage drop eliminating device is provided with a first voltage measurement PT1 module and a first current measurement CT1 module, the first voltage measurement PT1 module is connected with a first AD conversion module, and the first AD conversion module is connected with a first voltage and phase detection module; the first current measurement CT1 module is connected with the second AD conversion module, and the first voltage, the phase detection module and the second AD conversion module are respectively connected with the CPU module; the output end of the voltage drop eliminating device is provided with a second voltage measurement PT2 module and a second current measurement CT2 module, the second voltage measurement PT2 module is connected with a fourth AD conversion module, and the fourth AD conversion module is connected with a second voltage and phase detection module; the second current measurement CT2 module is connected with the third AD conversion module, and the third AD conversion module, the second voltage and the phase detection module are respectively connected with the CPU module.
The measurement precision of the voltage measurement PT1 and PT2 modules is not lower than 0.1%, the measurement precision of the current measurement CT1 and CT2 modules is not lower than 0.2%, the PT1 and PT2, the CT1 and CT2, the A/D conversion, the voltage and phase detection module, the CPU module, the switch control module and the display module, and the communication module form a measurement and monitoring function module; wherein the CPU module, the switch control module, the display module and the communication module can be shared with the voltage drop eliminating device; to save costs.
The CPU module is connected with the display module.
The CPU module is connected with the communication module; the communication module is connected with the system master station.
The voltage drop eliminating device is based on the principle of a voltage follower.
The measuring method for the circuit structure for measuring the PT secondary circuit voltage drop and load comprises the following steps:
loop pressure drop and load measurement in pressure drop cancellation mode: when the pressure drop device is put into operation and works normally, K1, K2 and K3 are all closed, and a CPU is instructed to measure the pressure drop and load of the PT secondary circuit manually or remotely on site; the CPU module is controlled by on-site manual or remote instructions to measure the pressure drop and load of the PT secondary circuit; the first voltage measurement PT1 module measures a group of voltage vectors U at the same time scale I The second voltage measurement PT2 module measures a set of voltage vectors U O Vector U of voltage I And U O Performing voltage amplitude and voltage phase calculation in a voltage amplitude and phase detection module after A/D conversion to obtain the ratio difference, angle difference and voltage difference of the voltage vectors of the head end and the tail end of the PT secondary loop and the PT output end of the PT secondary loop in the voltage drop elimination mode; meanwhile, the first current measurement CT1 module measures the front-end current I of the PT secondary circuit voltage drop eliminating device I The second current measurement CT2 module measures the current I at the rear end of the PT secondary circuit voltage drop eliminating device O From V I *I I Calculating to obtain the front load and V of the PT secondary circuit pressure drop eliminating device I Is U (U) I Amplitude value; from V O *I O Calculating to obtain PT IIBack end load, V of secondary loop pressure drop eliminator O Is U (U) O Amplitude values.
The measuring method for the circuit structure for measuring the PT secondary circuit voltage drop and load further comprises the following steps:
PT secondary loop pressure drop and load measurement in the as-is mode: when the pressure drop device is out of operation, K1, K2 and K3 are all disconnected, and the CPU is instructed manually or remotely on site to measure the pressure drop and load of the original PT secondary circuit. The CPU instruction measurement mode is started, and the device automatically performs measurement on-site manual or remote instruction to control the CPU module to measure the pressure drop and load of the original PT secondary circuit; the voltage first voltage measurement PT1 module measures a group of voltage vectors U under the same time scale I The second voltage measurement PT2 module measures a set of voltage vectors U O Vector U of voltage I And U O Performing voltage amplitude and voltage phase calculation in a voltage amplitude and phase detection module after A/D conversion to obtain the ratio difference, angle difference and voltage difference of the voltage vectors of the head end and the tail end of the original PT secondary loop and the PT output end; meanwhile, the first current measuring CT1 module measures PT secondary circuit current I I From V I *I I And calculating to obtain the PT secondary circuit load.
The CPU module collects U I And U O ，I I And I O And then monitoring the PT secondary circuit.
Measurement mode
(1) Manual measurement in site: the measurement instruction is manually input. The CPU starts the measuring mode, the device automatically performs measurement, displays the measuring result on site, stores the measuring data and uploads the measuring data to the system main station for processing. The measurement is continuously carried out for 3 times at intervals of 1min, and the measurement is automatically finished 30s after the last measurement.
(2) Remote automatic measurement: and (3) remotely inputting a measurement instruction, selecting a measurement mode, sending an instruction by a CPU module, automatically measuring by the device, displaying a measurement result on site, storing measurement data and uploading the measurement data to a system main station for processing. The measurement is continuously carried out for 3 times at intervals of 1min, and the measurement is automatically finished 30s after the last measurement. The voltage measuring module forms an independent module separated from the voltage drop eliminating device and is connected with the voltage drop eliminating device in a plug-in mode; the combination of the functions of the integral pressure drop eliminating device is facilitated; or may be integrated into the pressure drop relief device in a decentralized manner.
The working power supply of the voltage measuring module is provided by the working power supply of the voltage drop device
The circuit structure for measuring the PT secondary circuit voltage drop and the load by adopting the voltage drop eliminating device based on the voltage follower principle is formed by the circuit, and meanwhile, the PT secondary circuit is monitored.
When the pressure drop eliminating device does not work, the PT secondary circuit is in the original secondary circuit state:
(1) Measuring the PT secondary circuit head voltage U under the same time scale I And terminal voltage U O U is obtained through A/D conversion, voltage and phase detection module I And U O The amplitude and the phase of the three-phase voltage enter the CPU to calculate and obtain the three-phase voltage difference, the ratio difference and the angle difference between the tail end and the head end, wherein the calculation formula of the ratio difference f is as follows:
f (A) ＝△V (A) /V I(A) ，△V (A) ＝V O(A) -V I(A) ，
f (B) ＝△V (B) /V I(B) ，△V (B) ＝V O(B) -V I(B) ，
f (C) ＝△V (C) /V I(C) ，△V (C) ＝V O(C) -V I(C) ，
f (A) 、f (B) 、f (C) the corresponding three-phase branches of the ratio difference f are respectively; v (V) I(A) 、V I(B) 、V I(C) Respectively is
PT secondary loop head end voltage U I Corresponding to the amplitude of the three-phase voltage, V O(A) 、V O(B) 、V O(C) PT respectively
Terminal voltage U of secondary loop O Corresponding to the amplitude of the three-phase voltage
The calculation formula of the angle difference delta is as follows:
δ (A) ＝Φ O(A) -Φ I(A) ，
δ (B) ＝Φ O(B) -Φ I(B) ，
δ (C) ＝Φ O(C) -Φ I(C) ，
δ (A) 、δ (B) 、δ (C) corresponding three-phase entries of the angle difference delta are respectively; phi I(A) 、Φ I(B) 、Φ I(C) 、
Respectively the PT secondary loop head end voltage U I Corresponds to the phase of the three-phase voltage phi O(A) 、Φ O(B) 、Φ O(C)
Respectively PT secondary loop terminal voltage U O Corresponding to three-phase voltage phase
Pressure drop relative value Deltau/U I The calculation formula of (2) is as follows:(2) At the same time, the current I at the input end of the voltage drop eliminating device is measured I The result is obtained by A/D conversion and CPU calculation
Road load
The load is V I *I I
In the pressure drop device operating mode:
(1) Measuring the PT secondary circuit head voltage U under the same time scale I And terminal voltage U O U is obtained through A/D conversion, voltage and phase detection module I And U O The amplitude and the phase of the three-phase voltage enter the CPU to calculate and obtain the three-phase voltage difference, the ratio difference and the angle difference between the tail end and the head end, wherein the calculation formula of the ratio difference f is as follows:
f (A) ＝△V (A) /V I(A) ，△V (A) ＝V O(A) -V I(A) ，
f (B) ＝△V (B) /V I(B) ，△V (B) ＝V O(B) -V I(B) ，
f (C) ＝△V (C) /V I(C) ，△V (C) ＝V O(C) -V I(C) ，
f (A) 、f (B) 、f (C) corresponding three-phase branches of the ratio difference f；V I(A) 、V I(B) 、V I(C) Respectively the PT secondary loop head end voltage U I Corresponding to the amplitude of the three-phase voltage, V O(A) 、V O(B) 、V O(C) Respectively PT secondary loop terminal voltage U O Corresponding to the amplitude of the three-phase voltage
The calculation formula of the angle difference delta is as follows:
δ (A) ＝Φ O(A) -Φ I(A) ，
δ (B) ＝Φ O(B) -Φ I(B) ，
δ (C) ＝Φ O(C) -Φ I(C) ，
δ (A) 、δ (B) 、δ (C) corresponding three-phase entries of the angle difference delta are respectively; phi I(A) 、Φ I(B) 、Φ I(C) Respectively PT secondary loop head end voltage U I Corresponds to the phase of the three-phase voltage phi O(A) 、Φ O(B) 、Φ O(C) Respectively PT secondary loop terminal voltage U O Corresponding to three-phase voltage phase
Pressure drop relative value Deltau/U I The calculation formula of (2) is as follows:
(2) At the same time, the current I at the input end of the voltage drop eliminating device is measured I The load of the front-end loop of the pressure drop device is obtained by A/D conversion and CPU calculation, and the load is V I *I I The method comprises the steps of carrying out a first treatment on the surface of the Measuring the current I at the output end of the voltage drop eliminating device O The load of the loop at the rear end of the pressure drop device is obtained by A/D conversion and CPU calculation, and the load is V O *I O 。
The device monitors the working condition of the PT secondary circuit no matter whether the pressure drop eliminating device is in a working state or not.
Claims (5)
1. The measuring method of the circuit structure for measuring PT secondary circuit voltage drop and load comprises a voltage drop eliminating device, wherein the input end of the voltage drop eliminating device is connected with the PT secondary circuit, and the output end of the voltage drop eliminating device is connected with an electric energy meter; the method is characterized in that: the input end of the voltage drop eliminating device is provided with a first voltage measurement PT1 module and a first current measurement CT1 module, the first voltage measurement PT1 module is connected with a first AD conversion module, and the first AD conversion module is connected with a first voltage and phase detection module; the first current measurement CT1 module is connected with the second AD conversion module, and the first voltage, the phase detection module and the second AD conversion module are respectively connected with the CPU module; the output end of the voltage drop eliminating device is provided with a second voltage measurement PT2 module and a second current measurement CT2 module, the second voltage measurement PT2 module is connected with a fourth AD conversion module, and the fourth AD conversion module is connected with a second voltage and phase detection module; the second current measurement CT2 module is connected with the third AD conversion module, and the third AD conversion module, the second voltage and the phase detection module are respectively connected with the CPU module;
the measuring method is characterized in that: it comprises the following steps:
loop pressure drop and load measurement in pressure drop cancellation mode: when the pressure drop device is put into operation and works normally, the CPU module is controlled by on-site manual or remote instructions to measure the pressure drop and load of the PT secondary circuit; the first voltage measurement PT1 module measures a group of voltage vectors at the same time scaleU I The second voltage measurement PT2 module measures a set of voltage vectorsU O Vector the voltageU I And (3) withU O Performing voltage amplitude and voltage phase calculation in a voltage amplitude and phase detection module after A/D conversion to obtain the ratio difference, angle difference and voltage difference of the voltage vectors of the head end and the tail end of the PT secondary loop and the PT output end of the PT secondary loop in the voltage drop elimination mode; meanwhile, the first current measurement CT1 module measures the front-end current I of the PT secondary circuit voltage drop eliminating device I The second current measurement CT2 module measures the current I at the rear end of the PT secondary circuit voltage drop eliminating device O From V I *I I Calculating to obtain the front load and V of the PT secondary circuit pressure drop eliminating device I Is thatU I Amplitude value; from V O *I O Calculating to obtain the back-end load, V of the PT secondary circuit pressure drop eliminating device O Is thatU O Amplitude value;
it also includes:
PT secondary loop pressure drop and load measurement in the as-is mode: when the pressure drop device is out of operation, the on-site manual or remote instruction control CPU module measures the pressure drop and load of the original PT secondary circuit; the voltage first voltage measurement PT1 module measures a group of voltage vectors under the same time scaleU I The second voltage measurement PT2 module measures a set of voltage vectorsU O Vector the voltageU I And (3) withU O Performing voltage amplitude and voltage phase calculation in a voltage amplitude and phase detection module after A/D conversion to obtain the ratio difference, angle difference and voltage difference of the voltage vectors of the head end and the tail end of the original PT secondary loop and the PT output end; meanwhile, the first current measuring CT1 module measures PT secondary circuit current I I From V I *I I And calculating to obtain the PT secondary circuit load.
2. The method for measuring the circuit structure of the pressure drop and the load of the PT secondary circuit according to claim 1, wherein the method comprises the following steps of: the CPU module is connected with the display module.
3. The method for measuring the circuit structure of the pressure drop and the load of the PT secondary circuit according to claim 1, wherein the method comprises the following steps of: the CPU module is connected with the communication module; the communication module is connected with the system master station.
4. The method for measuring the circuit structure of the pressure drop and the load of the PT secondary circuit according to claim 1, wherein the method comprises the following steps of: the voltage drop eliminating device is based on the principle of a voltage follower.
5. The method for measuring the circuit configuration of the PT secondary loop voltage drop and load according to claim 1, wherein: the CPU module collectsU I And (3) withU O ，I I And I O And then monitoring the PT secondary circuit.
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