CN110703087B - Device and method for detecting expected TRV of high-capacity test system - Google Patents
Device and method for detecting expected TRV of high-capacity test system Download PDFInfo
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- CN110703087B CN110703087B CN201910890754.1A CN201910890754A CN110703087B CN 110703087 B CN110703087 B CN 110703087B CN 201910890754 A CN201910890754 A CN 201910890754A CN 110703087 B CN110703087 B CN 110703087B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/333—Testing of the switching capacity of high-voltage circuit-breakers ; Testing of breaking capacity or related variables, e.g. post arc current or transient recovery voltage
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention belongs to the technical field of electrical engineering, and particularly relates to an expected TRV detection device and method for a high-capacity test system. The device is characterized in that a power supply of a high-capacity test system is connected with a power supply side adjustable reactor, the other end of the power supply side adjustable reactor is connected with tested switch equipment, the other end of the tested switch equipment is connected with a load adjustable reactor, and the other end of the load adjustable reactor is grounded; the power supply side frequency modulation branch is connected with the power supply side adjustable reactor; the load side frequency modulation branch is connected with the load side adjustable reactor; the TRV measuring system is connected with the tested switch equipment, and the other end of the TRV measuring system is connected with the signal of the central processing unit; the other end of the signal of the central processing unit is connected with the frequency modulation branch control system, and the other end of the frequency modulation branch control system is respectively connected with the power supply side frequency modulation branch and the load side frequency modulation branch. The invention has simple structure, reasonable design, reduced system electric energy and equipment loss, less interference signals and higher accuracy of detecting TRV waveform.
Description
Technical Field
The invention belongs to the technical field of electrical engineering, and particularly relates to a device and a method for detecting expected transient recovery voltage (TRANSIENT RECOVERY VOLTAGE, TRV) of a high-capacity test system, which are a method for detecting the expected TRV of a high-capacity switching-on/off circuit breaker.
Background
Before the high-voltage circuit breaker breaking test is carried out, the electric parameters of the high-capacity test system are adjusted according to different breaking modes of the circuit breaker, and the expected breaking test transient recovery voltage waveform meeting the national standard is obtained. Because of the complex adjustment of the test parameters, a large amount of debugging preparation work is performed to obtain a good expected test TRV waveform. If a high-capacity test power supply is used for verifying the correctness of TRV waveforms in different modes, great waste of energy and equipment is caused, and the system setting in the adjustment process is complex, so that the adjustment difficulty and the workload are increased. Therefore, there is an urgent need for a device that is convenient to carry, simple to operate, reliable in use, and accurate in detection method to accomplish the test intended TRV measurement.
Disclosure of Invention
The invention provides a device and a method for detecting the expected TRV of a high-capacity test system, which are based on a direct-current signal source. The device aims to provide the device which has simple structure and reasonable design and can solve the problems of the prior detection of the expected TRV energy source, large equipment loss, complex detection system, poor detection means flexibility, large detection workload and the like.
In order to achieve the above object, the technical scheme adopted by the invention for solving the technical problems is as follows:
The anticipated TRV detection device of the high-capacity test system is characterized in that a high-capacity test system power supply is connected with a power supply side adjustable reactor, the other end of the power supply side adjustable reactor is connected with a tested switch device, the other end of the tested switch device is connected with a load adjustable reactor, and the other end of the load adjustable reactor is grounded; the power supply side frequency modulation branch is connected with the power supply side adjustable reactor; the load side frequency modulation branch is connected with the load side adjustable reactor; the TRV measuring system is connected with the tested switch equipment, and the other end of the TRV measuring system is connected with signals of the central processing unit; the other end of the signal of the central processing unit is connected with the frequency modulation branch control system, and the other end of the frequency modulation branch control system is respectively connected with the power supply side frequency modulation branch and the load side frequency modulation branch.
The outlet end of the high-capacity test system power supply is connected with the inlet end of the power supply side adjustable reactor, the outlet end of the power supply side adjustable reactor is connected with the inlet end of the tested switching equipment, the outlet end of the tested switching equipment is connected with the inlet end of the load adjustable reactor, and the outlet end of the load adjustable reactor is grounded;
the incoming line end of the power supply side frequency modulation branch is connected with the outgoing line end of the power supply side adjustable reactor; the incoming line end of the load side frequency modulation branch is connected with the incoming line end of the load side adjustable reactor;
The signal acquisition end of the TRV measuring system is connected with the wire inlet end and the wire outlet end of the tested switch equipment, and the signal output end of the TRV measuring system is connected with the signal input end of the central processing unit;
The signal output end of the central processing unit is connected with the signal input end of the frequency modulation branch control system, and the signal output end of the frequency modulation branch control system is respectively connected with the control signal input ends of the power supply side frequency modulation branch and the load side frequency modulation branch.
The detection system of the detection device comprises: the outlet end of the protection circuit breaker of the high-capacity test system is connected with the outlet end of the adjustable direct current power supply, the two ends of the tested switch equipment are connected with mercury switches in parallel, and the tested switch equipment and the mercury switches are arranged at the opening positions; connecting a TRV measurement voltage divider at the power supply side at the connection position of the mercury switch power supply side and the power supply side frequency modulation branch; connecting a load side TRV measuring voltage divider at the connection position of the load side and the load side frequency modulation branch of the mercury switch; TRV measuring voltage divider between switch breaks is connected to two sides of mercury switch; the measurement output ends of the TRV measurement voltage divider at the power supply side, the TRV measurement voltage divider at the load side and the TRV measurement voltage divider between the switch fracture are connected with the input end of the oscilloscope; the output end of the oscilloscope is connected with the control loop computer.
The high-capacity test system comprises a 12kV high-capacity test system, and the direct current voltage is 30V.
The signal acquisition end of the TRV measuring system is connected with the inlet end and the outlet end of the tested switch equipment, acquires voltage signals, and transmits the acquired voltage signals to the signal input end of the central processing unit through the signal output end of the TRV measuring system.
A method for testing expected TRV of a high capacity test system, comprising:
disconnecting the high-capacity test system protection circuit breaker and connecting the high-capacity test system protection circuit breaker with an adjustable direct current power supply;
Calculating and setting the reactance value of the power-side adjustable reactor and the load-side adjustable reactor according to the breaking current value of the breaker;
According to the reactor value and the TRV waveform requirement between the switch fracture, calculating and setting the capacitance and resistance values of the power supply side frequency modulation branch and the load side frequency modulation branch;
Setting the initial state of a mercury switch as a switching-off state, performing switching-on and switching-off operation of the mercury switch once, and respectively recording TRV waveforms at different positions;
comparing, analyzing and measuring the difference between the TRV and the standard TRV waveform parameters, and calculating and adjusting the capacitance and resistance values of the power supply side frequency modulation branch and the load side frequency modulation branch;
re-operating the mercury switch on/off operation, and re-measuring and comparing the TRV waveform;
and repeatedly adjusting the frequency modulation branch parameters of the high-capacity test system until the TRV waveform meets the standard requirement.
The detection method of the expected TRV detection device of the high-capacity test system can further comprise the following steps:
a. The outlet end of the protection circuit breaker of the high-capacity test system is connected with the outlet end of the adjustable direct current power supply, and the direct current voltage value is adjusted according to the system parameters;
b. The mercury switches are connected in parallel at two ends of the tested switch equipment, and the tested switch equipment and the mercury switches are arranged at the opening positions;
c. Connecting a TRV measurement voltage divider at the power supply side at the connection position of the mercury switch power supply side and the power supply side frequency modulation branch; connecting a load side TRV measuring voltage divider at the connection position of the load side and the load side frequency modulation branch of the mercury switch; TRV measuring voltage divider between switch breaks is connected to two sides of mercury switch;
d. The measurement output ends of the TRV measurement voltage divider at the power supply side, the TRV measurement voltage divider at the load side and the TRV measurement voltage divider between the switch fracture are connected with the input end of the oscilloscope;
e. The output end of the oscilloscope is connected with the control loop computer;
f. Measuring t 3 (TRV reference time/us), t d (TRV delay time/us) and u c (TRV peak value/kV) values of a TRV waveform, comparing the measured parameters with standard required parameters, and combining the comparison results; multiplying the measurement result of the expected TRV voltage Uc by a transformation ratio K, and comparing the measurement result with a standard requirement value; and adjusting the capacitance and resistance parameters of the frequency modulation branch according to the measurement result until the expected TRV measurement result meets the labeling requirement.
And the computer controls the setting of resistance and capacitance values in the frequency modulation branch of the high-capacity test system.
The t 3 (TRV reference time/us) of the measured TRV waveform is 25, the t d (TRV delay time/us) is 5, the u c (TRV peak value/kV) value is 68.4, the measured parameter and the standard required parameter are compared, and the comparison result is combined; when a 30V direct current power supply is adopted to replace a 12kV alternating current power supply, the expected TRV voltage Uc measurement result is multiplied by a transformation ratio K and then is compared with a standard required value; the resulting transformation ratio K was 12kV/30 v=400.
The detection method of the expected TRV detection device of the high-capacity test system can further comprise the following steps:
the high-capacity test system is a 12kV high-capacity test system, measures a transient recovery voltage TRV curve of a circuit breaker after short circuit is opened, and comprises:
a. Disconnecting the 12kV high-capacity test system protection circuit breaker, and cutting off the test alternating current power supply;
b. An adjustable direct current power supply is connected to the outlet end of the system protection circuit breaker, and a power supply value is selected according to the system impedance parameter;
c. Calculating parameters of an adjustable reactor of a system and parameters of an adjustable reactor of a load according to a short-circuit current value required to be opened by a tested breaker; according to TRV (total power voltage) requirements of the tested switching equipment, calculating initial set values of capacitance and resistance in the power supply side frequency modulation branch and the load side frequency modulation branch by combining parameters of the power supply side adjustable reactor and the load side adjustable reactor;
d. The method comprises the steps of applying a large-capacity test system, and adjusting the reactance values of a power-side adjustable reactor and a load-side adjustable reactor of the large-capacity test system, and the values of capacitance and resistance in a power-side frequency modulation branch and a load-side frequency modulation branch according to initial values of system calculation parameters;
e. The working states of the TRV measuring voltage divider at the power supply side, the TRV measuring voltage divider at the load side, the TRV measuring voltage divider among the switch fracture and the oscilloscope are debugged, and the connection and the measuring states of the oscilloscope and the computer are checked;
f. carrying out single switching-on and switching-off actions on the mercury switch, respectively detecting TRV waveforms among a load side, a power supply side and a switch fracture, and calculating key parameters of the TRV waveforms according to the detected waveforms;
g. Comparing, analyzing and detecting TRV waveforms and a standard TRV waveform of the tested switching equipment, recalculating values of the capacitors and the resistors in the power supply side frequency modulation branch and the load side frequency modulation branch according to key parameter changes of the TRV waveforms, and adjusting the values of the capacitors and the resistors in the power supply side frequency modulation branch and the load side frequency modulation branch to be set as recalculated values;
h. repeating the steps f and g until the TRV waveform between the switch breaks meets the TRV standard requirement of the tested breaker;
i. and c, repeating the steps from c to h according to different short-circuit current values, and respectively recording the system power supply side reactor, the load side reactor, the capacitor and the resistance parameter values of the TRV waveform meeting the standard requirements under different breaking currents.
The invention has the advantages and beneficial technical effects that:
1. the portable and reliable direct-current power supply is used for replacing a high-capacity system power supply, the structure is simple, the design is reasonable, the system electric energy and equipment loss are greatly reduced, the direct-current power supply has good stability and reliability, interference signals are few, and the accuracy of detecting TRV waveforms is high.
2. According to the invention, the mercury switch is used for replacing the on-off operation of the breaker equipment, so that the operation loss and test procedure of the breaker equipment are greatly saved, the test method is simplified, the test time is saved, and the detection efficiency of the expected TRV is increased.
3. The invention can avoid the interference of the arc generated by the switch operation on the TRV after the arc by using the mercury switch, so that the TRV waveform is easier to accurately measure, and the detection precision is improved.
4. Aiming at the target TRV parameters of the high-capacity test system, the invention can provide an adjustment scheme of the system parameters according to TRV waveforms given by the reactance, resistance and capacitance parameters of the existing system, thereby saving the adjustment time of the high-capacity system.
5. The invention realizes the algorithm for automatically giving the key parameters to the TRV waveform of the system, simplifies the measurement link and increases the efficiency of measuring the expected TRV waveform.
6. The device can be widely produced as a product, and has considerable benefits.
Drawings
In order to facilitate the understanding and practice of the invention, those of ordinary skill in the art will now make further details with reference to the drawings and detailed description, it being understood that the scope of the invention is not limited to the specific description.
FIG. 1 is a schematic diagram of a system architecture of the present invention;
FIG. 2 is a schematic diagram of the detection structure of the present invention;
fig. 3 is a graph of actual bulk system expected TRV measurements of the present invention.
In the figure: a high-capacity test system power supply 1; a power supply side adjustable reactor 2; a switch device 3 to be tested; a load-side adjustable reactor 4; a power supply side frequency modulation branch 5; a load side frequency modulation branch 6; a TRV measurement system 7; a frequency modulation branch control system 8; a central processing unit 9; the intended TRV detection apparatus 10; an adjustable direct current power supply 11; a power supply side TRV measurement voltage divider 12; a mercury switch 13; the load side TRV measurement voltage divider 14; a switching interruptive TRV measurement voltage divider 15; an oscilloscope 16; an ac power supply 17; a protection circuit breaker 18; a power supply side adjustable reactor 19; a power supply side frequency modulation branch 20; a switch device under test 21; a load side frequency modulation branch 22; a load side adjustable reactor 23; a computer 24.
Detailed Description
Example 1:
the invention relates to an expected TRV detection device of a high-capacity test system, which is shown in figure 1 and comprises a high-capacity test system power supply 1; a power supply side adjustable reactor 2; a switch device 3 to be tested; a load-side adjustable reactor 4; a power supply side frequency modulation branch 5; a load side frequency modulation branch 6; a TRV measurement system 7; a frequency modulation branch control system 8; and a central processing unit 9.
The outlet end of the high-capacity test system power supply 1 is connected with the inlet end of the power supply side adjustable reactor 2, the outlet end of the power supply side adjustable reactor 2 is connected with the inlet end of the tested switch device 3, the outlet end of the tested switch device 3 is connected with the inlet end of the load adjustable reactor 4, and the outlet end of the load adjustable reactor 4 is grounded.
The incoming line end of the power supply side frequency modulation branch 5 is connected with the outgoing line end of the power supply side adjustable reactor 2; the inlet end of the load side frequency modulation branch 6 is connected with the inlet end of the load side adjustable reactor 4.
The signal acquisition end of the TRV measuring system 7 is connected with the inlet end and the outlet end of the tested switch device 3, acquires voltage signals, and transmits the acquired voltage signals to the signal input end of the central processing unit 9 through the signal output end of the TRV measuring system 7.
The signal output end of the central processing unit 9 is connected with the signal input end of the frequency modulation branch control system 8, and the signal output end of the frequency modulation branch control system 8 is respectively connected with the control signal input ends of the power supply side frequency modulation branch 5 and the load side frequency modulation branch 6.
The method for detecting the expected TRV detection device of the high-capacity test system comprises the following steps:
a. The outlet end of the protection circuit breaker 18 of the high-capacity test system is connected with the outlet end of the adjustable direct current power supply 11, the direct current voltage value is adjusted according to the system parameters, and the direct current voltage is selected to be 30V by taking a12 kV high-capacity test system as an example.
B. The mercury switch 13 is connected in parallel with the two ends of the tested switch device 21, and the tested switch device 21 and the mercury switch 13 are arranged at the opening position.
C. The TRV measuring voltage divider 12 at the power supply side of the mercury switch 13 is connected with the frequency modulation branch 20 at the power supply side; the load side TRV measuring voltage divider 14 is connected to the connection position of the load side and the load side frequency modulation branch 22 of the mercury switch 13; a TRV measurement voltage divider 15 is connected across the mercury switch 13 between the switch breaks.
D. The measurement output ends of the power supply side TRV measurement voltage divider 12, the load side TRV measurement voltage divider 14 and the inter-switch-fracture TRV measurement voltage divider 15 are all connected with the input end of the oscilloscope 16.
E. The output end of the oscilloscope 16 is connected with a control loop computer 24, and the computer 24 controls the setting of resistance and capacitance values in the frequency modulation branch of the high-capacity test system.
F. As shown in fig. 3, the values of t 3 (TRV reference time/us), t d (TRV delay time/us), u c (TRV peak value/kV) of the TRV waveform were measured, and the measured parameters were compared with the standard required parameters, as shown in table 1, and the comparison results were combined. Since a 30V dc power supply is used instead of a 12kV ac power supply, it is expected that the TRV voltage Uc measurement should be multiplied by the transformation ratio K and then compared with the standard required value. And the K value is 12kV/30 V=400, and the capacitance and resistance parameters of the frequency modulation branch are adjusted according to the measurement result until the expected TRV measurement result meets the labeling requirement.
TABLE 1TRV measurement parameters and System parameters
The system comprises an adjustable direct current power supply 11, a power side TRV measuring voltage divider 12, a mercury switch 13, a load side TRV measuring voltage divider 14, a switch fracture TRV measuring voltage divider 15, an oscilloscope 16 and a computer 24.
As shown in fig. 2, fig. 2 is a schematic diagram of the detection structure of the present invention. Disconnecting the high-capacity test system protection circuit breaker 18 and connecting the adjustable direct current power supply 11; calculating and setting the reactance value of the power supply side adjustable reactor 19 and the load side adjustable reactor 23 according to the open-close current value of the circuit breaker; according to the reactor value and the TRV waveform requirement between the switch fracture, calculating and setting the capacitance and resistance values of the power supply side frequency modulation branch 20 and the load side frequency modulation branch 22; setting the initial state of the mercury switch 13 as a switching-off state, performing switching-on and switching-off operation of the mercury switch once, and respectively recording TRV waveforms at different positions; comparing and analyzing the difference between the measured TRV and the standard TRV waveform parameters, calculating and adjusting the capacitance and resistance values of the power supply side frequency modulation branch 20 and the load side frequency modulation branch 22, re-operating the mercury switch on and off operation, and measuring and comparing the TRV waveform again; and repeatedly adjusting the frequency modulation branch parameters of the high-capacity test system until the TRV waveform meets the standard requirement.
Example 2:
taking a 12kV high-capacity test system as an example, a Transient Recovery Voltage (TRV) curve of the circuit breaker after short-circuit opening is measured, and the specific operation flow is as follows:
a. First, the 12kV high-capacity test system protection circuit breaker 18 is opened, and the test alternating-current power supply 17 is cut off.
B. an adjustable direct current power supply 11 is connected to the outlet end of the system protection circuit breaker 18, and the power supply value is selected according to the system impedance parameter.
C. And calculating the parameters of the adjustable reactor of the system and the parameters of the adjustable reactor of the load according to the short-circuit current value required to be opened by the tested breaker. According to the TRV requirement of the tested switch device 21, the initial set values of the capacitance and the resistance in the power supply side frequency modulation branch 20 and the load side frequency modulation branch 22 are calculated by combining the parameters of the power supply side adjustable reactor 19 and the load side adjustable reactor 23.
D. And adjusting the reactance values of the power supply side adjustable reactor 19 and the load side adjustable reactor 23 of the large-capacity test system, and the capacitance and resistance values of the power supply side frequency modulation branch 20 and the load side frequency modulation branch 22 of the large-capacity test system according to the initial values of the system calculation parameters by using the large-capacity test control system.
E. The working states of the power supply side TRV measurement voltage divider 12, the load side TRV measurement voltage divider 14, the inter-switch-fracture TRV measurement voltage divider 15 and the oscilloscope 16 are debugged, and the connection and measurement states of the oscilloscope 16 and the computer 24 are checked.
F. the mercury switch 13 is subjected to single switching-on and switching-off operations, TRV waveforms on the load side, the power supply side, and between switch breaks are detected, and key parameters of the TRV waveforms are calculated based on the detected waveforms.
G. And comparing, analyzing and detecting the TRV waveform with the standard TRV waveform of the tested switching equipment, recalculating the values of the capacitance and the resistance in the power supply side frequency modulation branch 20 and the load side frequency modulation branch 22 according to the key parameter change of the TRV waveform, and adjusting the values of the capacitance and the resistance in the power supply side frequency modulation branch 20 and the load side frequency modulation branch 22 to be set as recalculated values.
H. Repeating the steps f and g until the TRV waveform between the switch breaks meets the TRV standard requirement of the tested breaker for opening.
I. and c, repeating the steps from c to h according to different short-circuit current values, and respectively recording the system power supply side reactor, the load side reactor, the capacitor and the resistance parameter values of the TRV waveform meeting the standard requirements under different breaking currents.
Claims (7)
1. A method for detecting the expected TRV of a high-capacity test system is characterized by comprising the following steps: comprising the following steps:
disconnecting the high-capacity test system protection circuit breaker and connecting the high-capacity test system protection circuit breaker with an adjustable direct current power supply;
Calculating and setting the reactance value of the power-side adjustable reactor and the load-side adjustable reactor according to the breaking current value of the breaker;
According to the reactor value and the TRV waveform requirement between the switch fracture, calculating and setting the capacitance and resistance values of the power supply side frequency modulation branch and the load side frequency modulation branch;
Setting the initial state of a mercury switch as a switching-off state, performing switching-on and switching-off operation of the mercury switch once, and respectively recording TRV waveforms at different positions;
comparing, analyzing and measuring the difference between the TRV and the standard TRV waveform parameters, and calculating and adjusting the capacitance and resistance values of the power supply side frequency modulation branch and the load side frequency modulation branch;
re-operating the mercury switch on/off operation, and re-measuring and comparing the TRV waveform;
Repeatedly adjusting the frequency modulation branch parameters of the high-capacity test system until the TRV waveform meets the standard requirement;
Further comprises: a. the outlet end of the protection circuit breaker of the high-capacity test system is connected with the outlet end of the adjustable direct current power supply, and the direct current voltage value is adjusted according to the system parameters; b. the mercury switches are connected in parallel at two ends of the tested switch equipment, and the tested switch equipment and the mercury switches are arranged at the opening positions; c. connecting a TRV measurement voltage divider at the power supply side at the connection position of the mercury switch power supply side and the power supply side frequency modulation branch; connecting a load side TRV measuring voltage divider at the connection position of the load side and the load side frequency modulation branch of the mercury switch; TRV measuring voltage divider between switch breaks is connected to two sides of mercury switch; d. the measurement output ends of the TRV measurement voltage divider at the power supply side, the TRV measurement voltage divider at the load side and the TRV measurement voltage divider between the switch fracture are connected with the input end of the oscilloscope; e. the output end of the oscilloscope is connected with the control loop computer; f. measuring t 3 (TRV reference time/us), t d (TRV delay time/us) and u c (TRV peak value/kV) values of a TRV waveform, comparing the measured parameters with standard required parameters, and combining the comparison results; multiplying the measurement result of the expected TRV voltage Uc by a transformation ratio K, and comparing the measurement result with a standard requirement value; adjusting the capacitance and resistance parameters of the frequency modulation branch according to the measurement result until the TRV measurement result is expected to meet the labeling requirement;
The detection device is characterized in that a power supply of a large-capacity test system is connected with a power supply side adjustable reactor, the other end of the power supply side adjustable reactor is connected with a tested switch device, the other end of the tested switch device is connected with a load adjustable reactor, and the other end of the load adjustable reactor is grounded; the power supply side frequency modulation branch is connected with the power supply side adjustable reactor; the load side frequency modulation branch is connected with the load side adjustable reactor; the TRV measuring system is connected with the tested switch equipment, and the other end of the TRV measuring system is connected with signals of the central processing unit; the other end of the signal of the central processing unit is connected with a frequency modulation branch control system, and the other end of the frequency modulation branch control system is respectively connected with a power supply side frequency modulation branch and a load side frequency modulation branch; the detection system comprises: the outlet end of the protection circuit breaker of the high-capacity test system is connected with the outlet end of the adjustable direct current power supply, the two ends of the tested switch equipment are connected with mercury switches in parallel, and the tested switch equipment and the mercury switches are arranged at the opening positions; connecting a TRV measurement voltage divider at the power supply side at the connection position of the mercury switch power supply side and the power supply side frequency modulation branch; connecting a load side TRV measuring voltage divider at the connection position of the load side and the load side frequency modulation branch of the mercury switch; TRV measuring voltage divider between switch breaks is connected to two sides of mercury switch; the measurement output ends of the TRV measurement voltage divider at the power supply side, the TRV measurement voltage divider at the load side and the TRV measurement voltage divider between the switch fracture are connected with the input end of the oscilloscope; the output end of the oscilloscope is connected with the control loop computer.
2. The method for detecting the expected TRV of the high-capacity test system according to claim 1, wherein the method comprises the following steps: the outlet end of the high-capacity test system power supply is connected with the inlet end of the power supply side adjustable reactor, the outlet end of the power supply side adjustable reactor is connected with the inlet end of the tested switching equipment, the outlet end of the tested switching equipment is connected with the inlet end of the load adjustable reactor, and the outlet end of the load adjustable reactor is grounded;
The incoming line end of the power supply side frequency modulation branch is connected with the outgoing line end of the power supply side adjustable reactor; the wire inlet end of the load side frequency modulation branch is connected with the wire inlet end of the load side adjustable reactor (4);
The signal acquisition end of the TRV measuring system is connected with the wire inlet end and the wire outlet end of the tested switch equipment, and the signal output end of the TRV measuring system is connected with the signal input end of the central processing unit;
The signal output end of the central processing unit is connected with the signal input end of the frequency modulation branch control system, and the signal output end of the frequency modulation branch control system is respectively connected with the control signal input ends of the power supply side frequency modulation branch and the load side frequency modulation branch.
3. The method for detecting the expected TRV of the high-capacity test system according to claim 1, wherein the method comprises the following steps: the high-capacity test system comprises a 12kV high-capacity test system, and the direct current voltage is 30V.
4. The method for detecting the expected TRV of the high-capacity test system according to claim 1, wherein the method comprises the following steps: the signal acquisition end of the TRV measuring system is connected with the inlet end and the outlet end of the tested switch equipment, acquires voltage signals, and transmits the acquired voltage signals to the signal input end of the central processing unit through the signal output end of the TRV measuring system.
5. The method for detecting the expected TRV of the high-capacity test system according to claim 1, wherein the method comprises the following steps: and the computer controls the setting of resistance and capacitance values in the frequency modulation branch of the high-capacity test system.
6. The method for detecting the expected TRV of the high-capacity test system according to claim 1, wherein the method comprises the following steps: the t 3 (TRV reference time/us) of the measured TRV waveform is 25, the t d (TRV delay time/us) is 5, the u c (TRV peak value/kV) value is 68.4, the measured parameter and the standard required parameter are compared, and the comparison result is combined; when a 30V direct current power supply is adopted to replace a 12kV alternating current power supply, the expected TRV voltage Uc measurement result is multiplied by a transformation ratio K and then is compared with a standard required value; the resulting transformation ratio K was 12kV/30 v=400.
7. The method for detecting the expected TRV of the high-capacity test system according to claim 1, wherein the method comprises the following steps: further comprises:
the high-capacity test system is a 12kV high-capacity test system, measures a transient recovery voltage TRV curve of a circuit breaker after short circuit is opened, and comprises:
a. Disconnecting the 12kV high-capacity test system protection circuit breaker, and cutting off the test alternating current power supply;
b. An adjustable direct current power supply is connected to the outlet end of the system protection circuit breaker, and a power supply value is selected according to the system impedance parameter;
c. Calculating parameters of an adjustable reactor of a system and parameters of an adjustable reactor of a load according to a short-circuit current value required to be opened by a tested breaker; according to TRV (total power voltage) requirements of the tested switching equipment, calculating initial set values of capacitance and resistance in the power supply side frequency modulation branch and the load side frequency modulation branch by combining parameters of the power supply side adjustable reactor and the load side adjustable reactor;
d. The method comprises the steps of applying a large-capacity test system, and adjusting the reactance values of a power-side adjustable reactor and a load-side adjustable reactor of the large-capacity test system, and the values of capacitance and resistance in a power-side frequency modulation branch and a load-side frequency modulation branch according to initial values of system calculation parameters;
e. The working states of the TRV measuring voltage divider at the power supply side, the TRV measuring voltage divider at the load side, the TRV measuring voltage divider among the switch fracture and the oscilloscope are debugged, and the connection and the measuring states of the oscilloscope and the computer are checked;
f. carrying out single switching-on and switching-off actions on the mercury switch, respectively detecting TRV waveforms among a load side, a power supply side and a switch fracture, and calculating key parameters of the TRV waveforms according to the detected waveforms;
g. Comparing, analyzing and detecting TRV waveforms and a standard TRV waveform of the tested switching equipment, recalculating values of the capacitors and the resistors in the power supply side frequency modulation branch and the load side frequency modulation branch according to key parameter changes of the TRV waveforms, and adjusting the values of the capacitors and the resistors in the power supply side frequency modulation branch and the load side frequency modulation branch to be set as recalculated values;
h. repeating the steps f and g until the TRV waveform between the switch breaks meets the TRV standard requirement of the tested breaker;
i. and c, repeating the steps from c to h according to different short-circuit current values, and respectively recording the system power supply side reactor, the load side reactor, the capacitor and the resistance parameter values of the TRV waveform meeting the standard requirements under different breaking currents.
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