CN116106659B - Distribution transformer energy efficiency high-precision test system and application - Google Patents
Distribution transformer energy efficiency high-precision test system and application Download PDFInfo
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- CN116106659B CN116106659B CN202211545478.3A CN202211545478A CN116106659B CN 116106659 B CN116106659 B CN 116106659B CN 202211545478 A CN202211545478 A CN 202211545478A CN 116106659 B CN116106659 B CN 116106659B
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Abstract
The invention discloses a high-precision testing system for energy efficiency of a distribution transformer and application thereof, comprising a test control module, a testing unit, a switching line unit, a high-precision multichannel measuring module and an output unit; a plurality of test modules of the test unit are connected with the switching line unit, and the switching line unit is connected with the output unit through the high-precision multichannel measurement module; the test control module is connected with the test module and the switching line unit; the test control module controls the test unit and the switching module to work; the testing module tests different energy efficiency testing modes of the testing transformer; the switching line unit switches the test module, and switches the control circuit and the circuit in different energy efficiency test modes; the high-precision multichannel measuring module collects voltage and current of each port in real time, and converts different test result values according to different test modes. According to the scheme, test of different energy efficiency test projects is realized, a plurality of different test modules are highly integrated, the equipment volume is reduced to the greatest extent, and the field test portability is improved.
Description
Technical Field
The invention relates to test equipment, in particular to a high-precision energy efficiency test system for a distribution transformer and application thereof.
Background
Transformers are one of the most important devices in power systems and are the basis for ensuring the reliability of the power supply. And the loss of the distribution transformer serving as the core equipment of the power grid is about 40% -50% of the loss of the power transmission and distribution power. The demand for transformers will continue to increase with the high-speed development of the overall economy, but the energy consumed by the power transformer itself will also increase with the increase in the installed capacity of the power transformer.
Along with the formal implementation of the limit value and the energy efficiency grade of the energy efficiency of the power transformer (GB-20052-2020), the high-efficiency energy-saving transformer becomes a market hotspot, the greatly purchasing trend is obvious, the energy efficiency test detection is particularly important for the transformer to ensure that each distribution transformer put into operation meets the energy efficiency grade requirement, the on-site batch development of the energy efficiency test of the transformer is already in trend, however, in the traditional mode, the function of the transformer tester is single, test instruments and test wires are required to be frequently changed in the test process, test data are manually recorded in the test process, and the defects of high working strength, low operation efficiency, high safety risk, inaccurate detection result and the like are generally caused.
In the face of the growing trend of the high-efficiency energy-saving transformer purchase and the urgent need of field test, there is a great need to develop a high-precision energy-efficiency tester for the distribution transformer, so that the safety, the standardization, the high efficiency and the control of the high-efficiency energy-saving testing test of the distribution transformer can be realized, the requirements of on-site and batch development of the high-efficiency energy-saving testing can be directly met, meanwhile, the reduction and the synergy of warehouse personnel can be promoted, the technical threshold of field test personnel can be reduced, and a strong support can be provided for building modern, green and intelligent supply chains.
Disclosure of Invention
The invention aims to: the invention aims to provide an energy efficiency high-precision testing system for a distribution transformer and application thereof.
The technical scheme is as follows: the invention relates to a high-precision testing system for energy efficiency of a distribution transformer, which comprises a test control module, a test unit, a switching line unit, a high-precision multichannel measuring module and an output unit, wherein the test control module is used for testing the energy efficiency of the distribution transformer; the test unit comprises a plurality of test modules, the test modules are electrically connected with the switching line unit, and the switching line unit is electrically connected with the output unit through the high-precision multichannel measurement module; the test control module is respectively connected with a plurality of test modules of the test unit and the switching line unit; the test control module controls a plurality of test modules and switching modules of the test unit to work according to a test flow; different test modules in the test unit respectively test different energy efficiency test modes of the test transformer; the switching line unit switches a plurality of test modules of the test unit, so as to switch control circuits and circuits in different energy efficiency test modes; the high-precision multichannel measuring module collects the voltage and the current of each port in real time, and converts different test result values according to different test modes.
The testing unit comprises a high-power variable-frequency power supply, a high-current direct-current source, a power analysis module and a direct resistance measurement module; the test control module is respectively and electrically connected with the high-power variable-frequency power supply, the high-current direct-current source, the power analysis module, the direct resistance measurement module and the switching line unit to form a control loop; the high-current direct-current source, the power analysis module and the direct-resistance testing module are all electrically connected with the switching line unit, and the switching line is completed under the control of the test control module.
The output unit comprises a direct resistance measurement output module, an idle test measurement output module and a load test measurement output module, wherein the direct resistance measurement output module, the idle test measurement output module and the load test measurement output module are respectively connected with the high-precision multichannel measurement module, and the direct resistance measurement output module, the idle test measurement output module and the load test measurement output module are switched to different measurement output modules according to an energy efficiency test mode.
The switching line unit comprises a test measurement module switching switch, a low-voltage short circuit device, a line switching switch, a distribution transformer winding wiring socket, a capacitive compensation switch and an intelligent compensation capacitor; the test measurement module change-over switch is connected with the plurality of test modules, and the test modules required by the test are switched according to different test items; the circuit switching switch adopts a high-voltage-resistant vacuum circuit breaker and is connected with a distribution transformer winding wiring socket to finish circuit switching of different measuring positions; the capacitive compensation switch is connected with the intelligent compensation capacitor to complete switching of the intelligent compensation capacitor; the low-voltage short-circuit device is used for realizing short-circuit of a low-voltage side winding in the short-circuit impedance and load loss measurement process; the intelligent compensation capacitor compensates load inductive current in the empty load test process.
The invention also comprises application of the high-precision testing system for the energy efficiency of the distribution transformer, and winding resistance measurement, no-load loss and no-load current measurement at 90% and 110% rated voltage, short-circuit impedance and load loss measurement are carried out by adopting the high-precision testing system for the energy efficiency of the distribution transformer.
The testing method for measuring the winding resistance comprises the following steps:
s101: magnetizing the winding coil to be stable by generating stable current through a high-current direct current source;
s102: selecting a test current gear according to the capacity and rated current of the tested transformer;
s103: testing on the line segments of each winding respectively, wherein all other non-tested line ends are in open circuit, and testing the line resistance of the three-phase transformer winding when the three-phase transformer winding is Y-connected and no neutral point is led out;
s104: when the winding resistance is tested, the temperature of the winding is recorded, and after each test is finished, the discharge operation is carried out on the test loop;
s105: the test windings are subjected to unified conversion, and the following conditions are satisfied:
wherein R is 1 Indicating the temperature t 1 Resistance value at the time; r is R 2 Indicating the temperature t 2 Resistance value at the time; t represents a constant.
The specific test method for the no-load loss and no-load current measurement comprises the following steps:
s201: starting to switch on a power supply, and pressurizing the low-voltage side of the distribution transformer to rated voltage;
s202: testing three-phase output current, test port voltage and test port loss power;
s203: the no-load current is an average value of three-phase current and converted into percentage of rated current, and the calculation formula is as follows:
wherein I is 0a 、I 0b 、I 0c A, b and c three-phase idle current actual measurement values are shown; i r Indicating the rated current of the exciting winding;
s204: the no-load loss is calculated as follows:
P m ＝P m -P wv -P s
wherein P is m Representing the actual measured loss of the transformer; p (P) wv Indicating instrument loss; p (P) s Indicating a measured cable loss;
s205: the correction value of the no-load loss is calculated as follows:
P 0 ＝P m (1+d)
d＝(U-U)/
wherein d represents a negative number; p (P) m Representing measured loss; u represents the average voltmeter reading; u represents the square root voltmeter reading.
The no-load loss and no-load current measurement at 90% and 110% rated voltage comprises the following steps:
s301: completing a switching line through a switching line unit;
s302: boosting the variable frequency power supply to 90% rated voltage at the low-voltage side of the distribution transformer, and boosting the 90% rated voltage to 110%;
s303: the voltage and the current are sampled and recorded respectively through a power analysis module;
s304: recording the voltage, current and power of each phase, and finally measuring the corresponding no-load loss and no-load current.
The short-circuit impedance and load loss measurement method specifically comprises the following steps:
s401: under the condition of good short circuit of the low-voltage side, starting to switch on a power supply, and enabling the high-voltage side to flow up to not less than 50% of rated current;
s402: testing three-phase output current, test port voltage and test port loss power;
s403: converting the loss and short circuit impedance at ambient temperature to a reference temperature, the loss being converted according to the following equation:
wherein P is k Representing load loss at a reference temperature; p (P) kt Representing load loss at t ℃; Σi 2 R represents the test temperature nextResistance loss to the winding; t representing a temperature conversion coefficient of the resistor;
s404, calculating a short-circuit impedance value and a short-circuit impedance calculation value:
wherein Z is kt Representing the short-circuit impedance of the winding at t ℃; u (U) kt Indicating the current I through the winding at t DEG C k Impedance voltage of (a); i k Indicating the applied current of the test; u (U) r A rated voltage on the applied voltage side; i r A rated current on the side of the applied voltage; z is Z k Representing the short circuit impedance at the reference temperature; p (P) kt Representing load loss at t ℃; p (P) k Representing load loss at a reference temperature; s is S r Indicating rated capacity.
The beneficial effects are that: compared with the prior art, the technical scheme of the invention has the beneficial effects that: (1) The device integrates the testing modules such as direct current resistor, power analysis and the like to the greatest extent, reduces the equipment volume, improves the portability of the field test, and can intelligently and efficiently complete the field energy efficiency detection test of the distribution transformer; (2) An intelligent switching matrix module is developed aiming at different detection projects, and is matched with a special test cable to finish the switching, insulation and isolation and the like between each energy efficiency test function and a control circuit and between output wires.
Drawings
FIG. 1 is a system block diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a direct resistance test connection according to an embodiment of the present invention;
FIG. 3 is a flow chart of a direct resistance test according to an embodiment of the present invention;
FIG. 4 is a flow chart of an idle load loss and idle load current test in accordance with an embodiment of the present invention;
FIG. 5 is a flow chart of the no-load loss and no-load current test at 90% and 110% rated voltage of an embodiment of the present invention;
FIG. 6 is a flow chart of a short circuit impedance and load loss test according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a switch line switching system according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a switch line unit according to an embodiment of the invention;
fig. 9 is a schematic diagram of an intelligent control system according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is described in detail below with reference to the detailed description and the attached drawings.
Example 1
As shown in FIG. 1, the test system of the invention comprises a power input, a main switch, an emergency stop protection, a test control module, a test unit, a switching line unit, a high-precision multichannel measurement module and an output unit. The test unit comprises a plurality of test modules, in particular a high-power variable-frequency power supply, a high-current direct-current source, a power analysis module and a direct resistance measurement module; the test control module is respectively and electrically connected with the high-power variable-frequency power supply, the high-current direct-current source, the power analysis module, the direct resistance measurement module and the switching line unit to form a control loop. The high-power variable-frequency power supply, the high-current direct-current source, the power analysis module and the direct resistance measurement module are all electrically connected with the switching line unit, and the switching line is completed under the control of the test control module. The switching line unit is electrically connected with the output unit through the high-precision multichannel measuring module. The output unit comprises a direct resistance measurement output module, an idle test measurement output module and a load test measurement output module, wherein the direct resistance measurement output module, the idle test measurement output module and the load test measurement output module are respectively connected with the high-precision multichannel measurement module, and the direct resistance measurement output module, the idle test measurement output module and the load test measurement output module are switched to different measurement output modules according to an energy efficiency test mode. The test control module controls a plurality of test modules and switching modules of the test unit to work according to a test flow, and comprises a self-checking module, an automatic test module, an automatic recording module and an output module; different test modules in the test unit test different energy efficiency test modes of the test transformer respectively. The switching line unit switches each test module of the test unit, so that control circuits and circuits in different energy efficiency test modes are switched. The high-precision multichannel measuring module collects the voltage and the current of each port in real time, and converts different test result values according to different test modes.
Table 1 Key Performance index of energy efficiency high precision tester for distribution transformer
The device consists of a high-power variable-frequency power supply, a high-current direct-current power supply, a switching line module, a high-precision multichannel measurement module and a test control module, and meets the requirements of winding resistance measurement, no-load loss and no-load current measurement at rated voltages of 90% and 110%, short-circuit impedance and load loss measurement, and 4 types of test capability are achieved. The high-power variable-frequency power supply can provide a test power supply for measuring no-load loss and no-load current, measuring no-load loss and no-load current at 90% and 110% rated voltage, and measuring short-circuit impedance and load loss; the high-current direct-current power supply can provide a test power supply for measuring winding resistance; the switching line unit distributes test power sources in each test step to corresponding ports; the multichannel measuring module collects the voltage and the current of each port in real time, and converts different test result values according to different test modes. The measurement modes of each test are as follows:
(1) The testing method for the winding resistance measurement of the direct resistance measurement module comprises the following steps:
s101: winding resistance measurement is carried out, and a winding coil is magnetized to be stable by generating stable current through a high-current direct current source;
s102: selecting a test current gear of the tester according to the capacity and rated current of the tested transformer;
s103: the measured current is not more than 10% of the rated current of the tested winding, and 3% -10% of the rated current of the tested winding can be used as the current value used for measuring the direct current resistor. As shown in fig. 2, the wiring schematic diagram is measured on the line segments of each winding respectively, other non-tested line ends are all in open circuit, and when the three-phase transformer winding is led out from the neutral point for Y connection, the line resistance of the three-phase transformer winding is measured, such as AB, BC and CA; when the winding is connected in D mode, the phase resistance of the winding is required to be measured, and the line resistance of the test sample with the closed triangle is required to be measured;
s104: when the winding resistance is measured, the winding temperature must be accurately recorded, and after each measurement is finished, the instrument automatically performs discharge operation on the measuring loop;
s105: the instrument automatically performs unified conversion on the test winding, wherein the temperature t of the test winding 1 And resistance R 1 The direct current resistance tested at different temperatures can be converted to the same temperature t according to the following resistance conversion formula 2 ；
Wherein R is 1 Indicating the temperature t 1 Resistance value at the time; r is R 2 Indicating the temperature t 2 Resistance value at the time; t represents a constant, wherein copper wire is 235 and aluminum wire is 225.
When the energy efficiency tester measures the winding resistance, firstly, a switching line is completed through a switching line unit; then outputting test current through a large direct current power supply; then, through a direct resistance measurement module, the voltage and the current are sampled and recorded; after the instrument is magnetized, the stable voltage and current values are recorded, and finally converted into resistance values.
(2) And measuring the no-load loss and the no-load current, wherein the no-load loss and the no-load current are measured by a high-power variable-frequency power supply and a multi-channel measuring module. The specific test method comprises the following steps:
s201: starting to switch on a power supply, and pressurizing the low-voltage side of the distribution transformer to rated voltage;
s202: measuring three-phase output current, sample port voltage and sample end loss power;
s203: the no-load current is the average value of three-phase current and converted into the percentage of rated current, namely:
wherein I is 0a 、I 0b 、I 0c A, b and c three-phase idle current actual measurement values are shown; i r Indicating the rated current of the exciting winding;
s204: the no-load loss is calculated as follows:
P m ＝P m -P wv -P s
wherein P is m Representing the actual measured loss of the transformer; p (P) wv Indicating instrument loss; p (P) s Indicating a measured cable loss;
s205: the correction value of the no-load loss is calculated as follows:
P 0 ＝P m (1+d)
d= (U-U)/(d is typically negative)
Wherein d represents a negative number; p (P) m Representing measured loss; u represents the average voltmeter reading; u represents the square root voltmeter reading.
When no-load loss and no-load current are tested, firstly, a switching line is switched through a switching line module; then boosting the variable-frequency power supply to rated voltage; then, the voltage and the current are sampled and recorded through a power analysis module; and recording the voltage, current and power of each phase; and finally obtaining rated no-load loss and no-load current.
(3) The no-load loss and no-load current measurements at 90% and 110% rated voltage, the specific test method comprising the steps of:
s301: completing a switching line through a switching line module;
s302: boosting the variable frequency power supply to 90% and 110% rated voltage, which is a continuous boosting process;
s303: the voltage and the current are sampled and recorded through a power analysis module;
s304: recording the voltage, current and power of each phase; corresponding no-load losses and no-load currents are finally measured.
(4) The short-circuit impedance and load loss measurement is carried out by a high-power variable-frequency power supply and a multi-channel measurement module, and the specific test method comprises the following steps of:
s401: under the condition of good short circuit of the low-voltage side, starting to switch on a power supply, and enabling the high-voltage side to flow up to not less than 50% of rated current;
s402: measuring three-phase output current, sample port voltage and sample end loss power;
s403: converting the loss and short circuit impedance at the ambient temperature to a reference temperature, converting the load loss to:
wherein P is k Representing load loss at a reference temperature; p (P) kt Representing load loss at t ℃; Σi 2 R represents the resistance loss of a pair of windings at the test temperature; t representing a temperature conversion coefficient of the resistor;
s404, calculating a short-circuit impedance value and a short-circuit impedance calculation value:
wherein Z is kt Representing the short-circuit impedance of the winding at t ℃; u (U) kt Indicating the current I through the winding at t DEG C k Impedance voltage of (a); i k Indicating the applied current of the test; u (U) r A rated voltage on the applied voltage side; i r A rated current on the side of the applied voltage; z is Z k Representing the short circuit impedance at the reference temperature; p (P) kt Representing load loss at t ℃; p (P) k Representing load loss at a reference temperature; s is S r Indicating rated capacity.
When short-circuit impedance and load loss tests are carried out, switching lines are completed through a switching line module; then, the variable frequency power supply is up-flowed to the rated current which is not less than 50% of the high-voltage side; the voltage and the current are sampled and recorded through a power analysis module; and recording the voltage, current and power of each phase; and finally, rated short-circuit impedance and load loss are obtained.
The switching line unit provides switching work of test lines between the test modules and the test products of the full test project. As shown in fig. 8, the switching line unit includes a test measurement module switch, a low-voltage short circuit device, a line switch, a distribution transformer winding connection socket, a capacitive compensation switch and an intelligent compensation capacitor. The test measurement module change-over switch is connected with the plurality of test modules, and the test modules required by the test are switched according to different test items. The low-voltage short-circuit device provides short-circuit impedance and a low-voltage side winding short-circuit function in a load loss measurement process; the capacitive compensation switch is connected with the intelligent compensation capacitor to complete switching of the intelligent compensation capacitor. The intelligent compensation capacitor compensates load inductive current in the empty load test process, and improves the equivalent test power supply capacity.
The switching line unit also comprises a line switching switch, and is connected with the distribution transformer winding wiring socket to finish line switching lines of different measuring positions. The change-over switch is a core component of the intelligent switching line device. At present, the multi-way change-over switch in the measuring field adopts an electronic switch and is designed into an integrated circuit board, and has the advantages of high speed, good response, easy control and the like, but the voltage-resistant level of a switch channel is low and the through-current capability is small. In the test process of power equipment such as a distribution transformer, the main loop needs to pass through high current and high voltage, so that an electronic change-over switch of an integrated circuit cannot be adopted.
Example 2
On the basis of the embodiment 1, the scheme also comprises an intelligent control system, wherein the intelligent control system is a central processing system for controlling and adjusting the whole test loop, and the structural principle of the intelligent control system is shown in fig. 9. The state detection module is responsible for monitoring test state information such as test loop state, instrument state and the like; the parameter input module is responsible for recording parameter information, test item information and various parameter configuration information of the test product, receiving control information of the main control system on the test process, and performing man-machine interaction and remote communication, so that control and remote control of a tester on the test process are timely and conveniently realized; the alarm processing module is responsible for preprocessing the detected alarm information; the test master control system is responsible for formulating a test control strategy by integrating state information, parameter configuration, remote control information and alarm information; the switch control module is responsible for formulating a corresponding switch control strategy according to the test control strategy; the control output simulation is responsible for converting the formulated switch control strategy into control signals and sending the control signals to each automatic transfer switch for execution.
Claims (4)
1. The utility model provides an application of distribution transformer efficiency high accuracy test system which characterized in that: the distribution transformer energy efficiency high-precision test system comprises a test control module, a test unit, a switching line unit, a high-precision multichannel measurement module and an output unit; the test unit comprises a plurality of test modules, the test modules are electrically connected with the switching line unit, and the switching line unit is electrically connected with the output unit through the high-precision multichannel measurement module; the test control module is respectively connected with a plurality of test modules of the test unit and the switching line unit;
the test control module controls a plurality of test modules and switching modules of the test unit to work according to a test flow;
different test modules in the test unit respectively test different energy efficiency test modes of the test transformer;
the switching line unit switches a plurality of test modules of the test unit, so as to switch control circuits and circuits in different energy efficiency test modes;
the high-precision multichannel measuring module collects the voltage and the current of each port in real time and converts different test result values according to different test modes;
winding resistance measurement, no-load loss and no-load current measurement at 90% and 110% rated voltage, short circuit impedance and load loss measurement are performed by adopting the distribution transformer energy efficiency high-precision test system;
the testing method for measuring the winding resistance comprises the following steps:
s101: magnetizing the winding coil to be stable by generating stable current through a high-current direct current source;
s102: selecting a test current gear according to the capacity and rated current of the tested transformer;
s103: testing on the line segments of each winding respectively, wherein all other non-tested line ends are in open circuit, and testing the line resistance of the three-phase transformer winding when the three-phase transformer winding is Y-connected and no neutral point is led out;
s104: when the winding resistance is tested, the temperature of the winding is recorded, and after each test is finished, the discharge operation is carried out on the test loop;
s105: the test windings are subjected to unified conversion, and the following conditions are satisfied:
wherein R is 1 Indicating the temperature t 1 Resistance value at the time; r is R 2 Indicating the temperature t 2 Resistance value at the time; t represents a constant;
the specific test method for the no-load loss and no-load current measurement comprises the following steps:
s201: starting to switch on a power supply, and pressurizing the low-voltage side of the distribution transformer to rated voltage;
s202: testing three-phase output current, test port voltage and test port loss power;
s203: the no-load current is an average value of three-phase current and converted into percentage of rated current, and the calculation formula is as follows:
wherein I is 0a 、I 0b 、I 0c A, b and c three-phase idle current actual measurement values are shown; i r Indicating the rated current of the exciting winding;
s204: the no-load loss is calculated as follows:
P m ＝P′ m -P wv -P s
wherein P' m Representing the actual measured loss of the transformer; p (P) wv Indicating instrument loss; p (P) s Indicating a measured cable loss;
s205: the correction value of the no-load loss is calculated as follows:
P 0 ＝P m (1+d)
d＝(U′-U)/U′
wherein d represents a negative number; p (P) m Indicating no-load loss; u' represents the average voltmeter reading; u represents the square root value voltmeter reading;
the no-load loss and no-load current measurement at 90% and 110% rated voltage comprises the following steps:
s301: completing a switching line through a switching line unit;
s302: boosting the variable frequency power supply to 90% rated voltage at the low-voltage side of the distribution transformer, and boosting the 90% rated voltage to 110%;
s303: the voltage and the current are sampled and recorded respectively through a power analysis module;
s304: recording the voltage, current and power of each phase, and finally measuring corresponding no-load loss and no-load current;
the short-circuit impedance and load loss measurement method specifically comprises the following steps:
s401: under the condition of good short circuit of the low-voltage side, starting to switch on a power supply, and enabling the high-voltage side to flow up to not less than 50% of rated current;
s402: testing three-phase output current, test port voltage and test port loss power;
s403: converting the loss and short circuit impedance at ambient temperature to a reference temperature, the loss being converted according to the following equation:
wherein P is k Representing load loss at a reference temperature; p (P) kt Representing load loss at t ℃; Σi 2 R represents the resistance loss of a pair of windings at the test temperature; k (K) t Representing a temperature conversion coefficient of the resistor;
s404, calculating a short-circuit impedance value and a short-circuit impedance calculation value:
wherein Z is kt Representing the short-circuit impedance of the winding at t ℃; u (U) kt Indicating the temperature of the winding t DEG C, the current I is applied by test k Impedance voltage of (a); i k Indicating the applied current of the test; u (U) r A rated voltage on the applied voltage side; i r Indicating the rated current of the exciting winding; z is Z k Representing the short circuit impedance at the reference temperature; p (P) kt Representing load loss at t ℃; p (P) k Representing load loss at a reference temperature; s is S r Indicating rated capacity.
2. The use of a high precision power distribution transformer energy efficiency testing system according to claim 1, wherein: the testing unit comprises a high-power variable-frequency power supply, a high-current direct-current source, a power analysis module and a direct resistance measurement module;
the test control module is respectively and electrically connected with the high-power variable-frequency power supply, the high-current direct-current source, the power analysis module, the direct resistance measurement module and the switching line unit to form a control loop.
3. The use of a high precision power distribution transformer energy efficiency testing system according to claim 1, wherein: the output unit comprises a direct resistance measurement output module, an idle test measurement output module and a load test measurement output module, wherein the direct resistance measurement output module, the idle test measurement output module and the load test measurement output module are respectively connected with the high-precision multichannel measurement module, and the direct resistance measurement output module, the idle test measurement output module and the load test measurement output module are switched to different measurement output modules according to an energy efficiency test mode.
4. The use of a high precision power distribution transformer energy efficiency testing system according to claim 1, wherein: the switching line unit comprises a test measurement module switching switch, a low-voltage short circuit device, a line switching switch, a distribution transformer winding wiring socket, a capacitive compensation switch and an intelligent compensation capacitor; the test measurement module change-over switch is connected with the plurality of test modules, and the test modules required by the test are switched according to different test items; the circuit switching switch adopts a high-voltage-resistant vacuum circuit breaker, is connected with a wiring socket of the distribution transformer winding to finish circuit switching of different measuring positions, and the capacitive compensation switch is connected with the intelligent compensation capacitor to finish switching of the intelligent compensation capacitor;
the low-voltage short-circuit device is used for realizing short-circuit of a low-voltage side winding in the short-circuit impedance and load loss measurement process;
the intelligent compensation capacitor compensates load inductive current in the empty load test process.
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| CN117665463A (en) * | 2023-12-14 | 2024-03-08 | 山东省产品质量检验研究院 | Transformer test system and method |
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