CN112305361A - Temperature rise test three-phase unbalanced current compensation system and control method - Google Patents
Temperature rise test three-phase unbalanced current compensation system and control method Download PDFInfo
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Abstract
本发明针对电力设备温升试验中试验电流三相不平衡的问题，提出了一种温升试验三相不平衡补偿系统及控制方法，通过补偿电流与主回路电流共同作用来有效平衡和稳定三相施加电流值，本补偿装置兼具响应速度和控制精度，控制补偿电流可实时跟随指令电流变化，保障试验结果的准确性。
Aiming at the problem of the three-phase unbalance of the test current in the temperature rise test of power equipment, the invention proposes a three-phase unbalance compensation system and control method for the temperature rise test. Phase applied current value, the compensation device has both response speed and control accuracy, and the control compensation current can follow the command current change in real time to ensure the accuracy of the test results.
Description
Technical Field
The invention belongs to the technical field of power equipment, and particularly relates to a temperature rise test three-phase unbalance compensation system and a control method.
Background
At present, phase-change switching loads, passive compensation devices and active compensation devices are mainly used for inhibiting three-phase load unbalance. The switching load of the commutation generally adopts an automatic switching mode, the unbalanced three-phase automatic switching device can realize automatic switching impedance according to a phase balance algorithm, the unbalanced three-phase current degree is reduced, but the impedance switching mode increases the load of a loop, and the test efficiency of the current rising device is reduced.
The additional passive compensation device generally utilizes a Static Var Compensator (SVC) to perform three-phase imbalance compensation. Static Var Compensator (SVC) is a device in which a capacitor with controllable output impedance is connected in parallel with a reactor group to realize smooth change of output reactive power. The most key technology of the method is to accurately solve the compensation admittance required by the system instruction, and although the compensation method is simple and easy to implement, the compensation error is larger and the compensation effect is not ideal for a loop with high resistive load unbalance degree.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problem of test current three-phase imbalance in the power equipment temperature rise test, the invention provides a temperature rise test three-phase imbalance current compensation system based on a voltage converter and a control method.
The technical scheme adopted by the invention is as follows: a temperature rise test three-phase unbalance compensation system comprises a three-phase unbalance current compensation circuit, a current acquisition device A and a controller; the three-phase unbalanced current compensation circuit is correspondingly connected into a three-phase main loop of a temperature rise test of a tested product, and each phase of unbalanced current compensation circuit comprises a single-phase current booster A; the current acquisition device A acquires unbalanced current in a three-phase main loop of a temperature rise test of a tested object, converts the acquired unbalanced current into a proper format and inputs the format into the controller, the controller calculates a compensation instruction according to the acquired unbalanced current and sends the compensation instruction to a single-phase current booster A in an unbalanced current compensation circuit connected with a single-phase main loop of the temperature rise test of the tested object, in which the unbalanced current is detected, in real time, and the single-phase current booster A is controlled by the compensation instruction to inject the compensation current into the corresponding single-phase main loop of the temperature rise test of the tested object.
Further, the compensation current is obtained by the following formula: i ═ IO-I |, wherein IOThe current requirement value is a test current requirement value, I is the collected unbalanced current, and I' is the compensation current.
Further, for the single-phase unbalanced current compensation circuit, the primary side of the single-phase current booster A is connected in parallel with a corresponding single-phase main loop of the temperature rise test of the tested object.
Furthermore, the single-phase unbalanced current compensation circuit further comprises a single-phase voltage regulator A for adjusting current, and the primary side of the single-phase voltage regulator A is connected with the secondary side of the single-phase current booster B in parallel.
Further, the current collecting device a comprises a current transformer a and a current collecting card a, the current transformer a is connected in series in a line of the single-phase current booster a and a single-phase main loop of the temperature rise test of the tested object for unbalanced current collection, the current collecting card a is connected in parallel at two ends of the current transformer a, and signals collected by the current transformer a are digitally converted.
The invention also discloses a temperature rise test system, which comprises a three-phase current rising main loop system and a temperature rise test three-phase unbalance compensation system, wherein the three-phase current rising main loop system is used for inputting the main loop current to the three-phase main loop of the temperature rise test of the tested product;
when the current value of any one phase of the total three-phase loop in the temperature rise test of the tested object reaches the test current requirement value, the unbalanced current compensation circuit connected with the other two-phase total loops in the temperature rise test of the tested object performs current compensation and current rise on the other two-phase total loops in the temperature rise test of the tested object, and when the current values of the total three-phase loop in the temperature rise test of the tested object reach the test current requirement value, the three-phase unbalanced compensation system in the temperature rise test stops current rise.
Furthermore, the three-phase current rising main loop system comprises three-phase current rising main loop circuits, each phase current rising main loop circuit has the same structure and comprises a single-phase current rising device B, and the secondary side of the single-phase current rising device B is connected with a single-phase main loop of a temperature rise test of a tested article.
Furthermore, each phase of the current rising main loop circuit further comprises a single-phase voltage regulator B and a compensation capacitor, wherein the primary side of the single-phase voltage regulator B is connected with a power supply, the secondary side of the single-phase voltage regulator B is connected with the primary side of the single-phase current rising device B in parallel, and the compensation capacitor is connected with the secondary side of the single-phase voltage regulator B in parallel.
Furthermore, each phase of current rising main loop circuit also comprises a current collecting device B and a voltmeter for detecting the secondary side voltage of the single-phase current rising device B; the current collecting device B comprises a current transformer B and a current collecting card B, the current transformer B is connected in series with the secondary side of the single-phase current booster B and a line of a single-phase main loop of a temperature rise test of a tested object for current collection, and the current collecting card B is connected in parallel with two ends of the current transformer B.
Furthermore, the device also comprises a voltmeter used for detecting the primary voltage of the single-phase current booster B in the single-phase unbalanced current compensation circuit.
Furthermore, a power supply of the three-phase current rising main loop system is shared with a power supply of the temperature rise test three-phase unbalance compensation system.
The invention also discloses a temperature rise test three-phase unbalance compensation control method, which specifically comprises the following steps:
applying test current to a three-phase main loop of a temperature rise test of a tested article, and stopping current rising of the main loop of the phase of the temperature rise test of the tested article when the current value of any one-phase main loop of the temperature rise test of the tested article reaches the test current requirement value;
obtaining the current value of the other two-phase total loop of the temperature rise test of the tested object, calculating and generating corresponding compensation current according to the current value, and feeding the generated compensation current back to the other two-phase total loop of the temperature rise test of the corresponding tested object;
when the current value of the other two-phase total loop of the temperature rise test of the tested object reaches the test current requirement value, the current rise is stopped, and the current of the temperature rise test of the tested object reaches a balanced state.
Further, when the fluctuation of the effective value of any phase of total current of the tested object in the temperature rise test process is larger than the protection set value, the three-phase total loop of the tested object in the temperature rise test automatically trips.
Further, the compensation current is obtained by the following formula: i ═ IO-I |, wherein IOThe current requirement value is a test current requirement value, I is the collected unbalanced current, and I' is the compensation current.
Has the advantages that: compared with the prior art, the invention has the following advantages:
(1) the compensation system is in charge of acquiring unbalanced current information of the system through a current acquisition card, converting the unbalanced current information into a proper format and inputting the format into the controller, calculating a compensation instruction through a compensation algorithm by the controller according to the unbalanced current acquired in real time and sending the compensation instruction to the current generator (single-phase current booster) in real time, controlling the current generator (single-phase current booster) to inject compensation current into the three-phase system under the control of the compensation instruction, effectively balancing and stabilizing three-phase applied current values through the common action of the compensation current and main loop current, and realizing the balance of the three-phase current of the test equipment; the compensation system has response speed and control precision, the control compensation current can change along with the instruction current in real time, and the accuracy of a test result is guaranteed;
(2) according to the temperature rise test system, the main current rise system and the balance compensation system share the same power supply, so that the uniformity of respective current phases can be effectively guaranteed, and meanwhile, the dependence on compensation admittance is greatly reduced;
(3) the compensation control method can adapt to and solve the problem of current imbalance caused by different test products in an active self-adaptive adjustment mode, can effectively balance three-phase current in the temperature rise test process, and ensures the accuracy of the test result.
Drawings
FIG. 1 is a schematic diagram of a three-phase unbalanced current compensation system of the present invention;
figure 2 is a schematic flow diagram of an implementation.
Detailed Description
The invention is further illustrated below with reference to the figures and examples.
Example 1:
in order to accurately grasp the imbalance condition of the three-phase current, the three-phase current needs to be detected and analyzed. In the embodiment, three-phase current data are acquired through a high-precision current transformer and a current acquisition card, and the three-phase current data of a main current boost circuit and the three-phase current data of a compensation current balance system are detected in real time in the current boost process. The concept of the current acquisition card is more suitable for weak current systems, and the embodiment is suitable for current acquisition in a strong current environment, so that a current transformer is adopted to convert strong current in a main loop into weak current signals, and then the current acquisition card is used for acquisition.
As shown in fig. 1, the temperature rise test three-phase unbalanced current compensation system comprises an a-phase unbalanced current compensation circuit, a B-phase unbalanced current compensation circuit, a C-phase unbalanced current compensation circuit and a controller;
the A-phase unbalanced current compensation circuit comprises a fourth current transformer LH4, a fourth ammeter A4, a fourth single-phase current booster B4 and a fourth single-phase voltage regulator TY 4; the primary side of the fourth single-phase current booster B4 is connected in parallel with the A-phase general loop of the tested object, and is connected in series in the line of the fourth single-phase current booster B4 and the A-phase general loop of the tested object through a fourth current transformer LH4 to carry out A-phase current IAIn measurement, the fourth ammeter a4 is connected in parallel at two ends of a fourth current transformer LH4, and the primary side of a fourth single-phase voltage regulator TY4 is connected in parallel with the secondary side of a fourth single-phase current booster B4. The current adjusting means adopted by the compensation system is described, the single-phase voltage regulators are called equipment, and the single-phase voltage regulators in the embodiment are used for adjusting the current.
The current collecting card is used for collecting the A phaseCurrent IACollecting and converting into a proper format to be input into a controller, and the controller inputs the proper format into the controller according to the A-phase current IACalculating the Compensation Current I'A＝|IO-IAIssuing a compensation command to a fourth single-phase current lift B4, the fourth single-phase current lift B4 generating a compensation current I 'according to the compensation command'A＝|IO-IAL, will compensate for current I'A＝|IO-IAAnd | feedback is injected into the phase A main loop of the tested object in parallel.
The B-phase unbalanced current compensation circuit comprises a fifth current transformer LH5, a fifth ammeter A5, a fifth single-phase current booster B5 and a fifth single-phase voltage regulator TY 5; the primary side of the fifth single-phase current booster B5 is connected in parallel with the tested sample B phase general loop, and is connected in series in the line of the fifth single-phase current booster B5 and the tested sample B phase general loop through a fifth current transformer LH5 to carry out B phase current IBIn measurement, the fifth ammeter a5 is connected in parallel to two ends of a fifth current transformer LH5, and the primary side of a fifth single-phase voltage regulator TY5 is connected in parallel to the secondary side of a fifth single-phase current booster B5.
The current acquisition card acquires the phase I of the current BBCollecting and converting into a proper format to be input into a controller, and the controller inputs the proper format into the controller according to the phase I of the phase B currentBCalculating the Compensation Current I'B＝|IO-IBIssuing a compensation command to a fifth single-phase current lift B5, the fifth single-phase current lift B5 generating a compensation current I 'according to the compensation command'B＝|IO-IBL, will compensate for current I'B＝|IO-IBAnd | feedback is injected into the B phase total loop of the tested object in parallel.
The C-phase unbalanced current compensation circuit comprises a sixth current transformer LH6, a sixth ammeter A6, a sixth single-phase current booster B6 and a sixth single-phase voltage regulator TY 6; the primary side of the sixth single-phase current booster B6 is connected in parallel with the tested sample C phase main loop, and is connected in series in the line of the sixth single-phase current booster B6 and the tested sample B phase main loop through a sixth current transformer LH6 to carry out C phase current ICIn measurement, the sixth ammeter a6 is connected in parallel to two ends of a sixth current transformer LH6, and the primary side of a sixth single-phase voltage regulator TY6 is connected in parallel to the secondary side of a sixth single-phase current booster B6.
Electric current miningThe card concentrator converts the C phase current ICCollecting and converting into a proper format to be input into a controller, and the controller inputs the proper format into the controller according to the C-phase current ICCalculating the Compensation Current I'C＝|IO-ICIssuing a compensation command to a sixth single-phase current lift B5, the sixth single-phase current lift B5 generating a compensation current I 'according to the compensation command'C＝|IO-ICL, will compensate for current I'C＝|IO-ICAnd | feedback is injected into the C phase total loop of the tested object in parallel.
The unbalanced current compensation system of the embodiment is used for detecting three-phase current data of a main current boost circuit and three-phase current data of a compensation current balance system in real time in the process of a current boost test, generating compensation current through three single-phase current boosters, and injecting the compensation current into a three-phase main circuit of a tested product to realize the balance of the three-phase current of the test equipment. The unbalanced current compensation system has a control strategy of response speed and control precision, and controls the compensation current to change along with the instruction current in real time.
Example 2:
the unbalanced current compensation system in embodiment 1 is applied to a temperature rise test system, and specifically, the temperature rise test system includes a three-phase current rising main loop system for inputting a main loop current to a main loop of a test object, an unbalanced current compensation system, and an LCD display for displaying a measured value. The method comprises the steps of detecting the three-phase test current value of a main loop in real time by selecting a proper current transformer, starting an unbalanced current compensation system after the current rise of any one phase of current rise main loop circuit is stopped, compensating the current rise of the other two phases of main loops by two built-in independent single-phase current rises, and stopping the current rise of the unbalanced current compensation system when the current value of the main loops reaches the test current requirement value. The upwelling of the two main loops are independent and do not influence each other. The three-phase up-flow main circuit system will now be described in detail.
The three-phase current rising main loop system of the embodiment is composed of three paths of current rising main loop circuits, and comprises an A-phase current rising main loop circuit, a B-phase current rising main loop circuit and a C-phase current rising main loop circuit. A phase A main loop of a tested product is connected in parallel with the phase A current rising main loop circuit, a phase B main loop of the tested product is connected in parallel with the phase B current rising main loop circuit, and a phase C main loop of the tested product is connected in parallel with the phase C current rising main loop circuit.
The A-phase current boost main loop circuit comprises a first single-phase voltage regulator TY1, a first compensation capacitor C1, a first single-phase current booster B1, a first current transformer LH1, a first ammeter A1, a first voltmeter V1 and a fourth voltmeter V4; the primary side of the first single-phase voltage regulator TY1 is connected with an A-phase power supply and a B-phase power supply, the secondary side of the first single-phase voltage regulator TY1 is connected in parallel with the primary side of a first single-phase current booster B1, the first compensation capacitor C1 is also connected in parallel with the secondary side of the first single-phase voltage regulator TY1, the secondary side of the first single-phase current booster B1 is connected with a tested article A-phase main loop S1, a first current transformer LH1 is connected in series in a circuit of the secondary side of the first single-phase current booster B1 and the tested article A-phase main loop S1, and the first ammeter A1 is connected in parallel with two ends of the first current transformer LH 1. The first voltmeter V1 is connected in parallel to the secondary side of the first single-phase current booster B1 and is used for detecting the voltage of the secondary side of the first single-phase current booster B1. When the A-phase unbalanced current compensation circuit is connected, the fourth voltmeter V4 is connected in parallel to the primary side of the fourth single-phase current booster B4 and is used for detecting the primary side voltage of the fourth single-phase current booster B4.
The B-phase current boost main circuit is the same as the a-phase current boost main circuit, and therefore, the B-phase current boost main circuit comprises a second single-phase voltage regulator TY2, a second compensation capacitor C2, a second single-phase current booster B2, a second current transformer LH2, a second ammeter a2, a second voltmeter V2 and a fifth voltmeter V5; the primary side of the second single-phase voltage regulator TY2 is connected with a B-phase power supply and a C-phase power supply, the secondary side of the second single-phase voltage regulator TY2 is connected in parallel with the primary side of a second single-phase current booster B2, the second compensation capacitor C2 is also connected in parallel with the secondary side of the second single-phase voltage regulator TY2, the secondary side of the second single-phase current booster B2 is connected with a tested article B-phase main loop S2, a second current transformer LH2 is connected in series in a circuit of the secondary side of the second single-phase current booster B2 and the tested article B-phase main loop, and a second current transformer A2 is connected in parallel with two ends of the second current transformer LH 2. The second voltage V2 is connected in parallel to the secondary side of the second single-phase current booster B2 and is used for detecting the voltage of the secondary side of the second single-phase current booster B2. When the B-phase unbalanced current compensation circuit is connected, the fifth voltage transformer V5 is connected in parallel to the primary side of the fifth single-phase current booster B5, and is used for detecting the primary side voltage of the fifth single-phase current booster B5.
The C-phase current boost main circuit is the same as the a-phase current boost main circuit, and therefore, the C-phase current boost main circuit comprises a third single-phase voltage regulator TY3, a third compensation capacitor C3, a third single-phase current booster B3, a third current transformer LH3, a third ammeter A3, a third voltmeter V3 and a sixth voltmeter V6; the primary side of a third single-phase voltage regulator TY3 is connected with a C-phase power supply and an A-phase power supply, the secondary side of a third single-phase voltage regulator TY3 is connected with the primary side of a third single-phase current booster B3 in parallel, a third compensation capacitor C3 is also connected with the secondary side of the third single-phase voltage regulator TY3 in parallel, the secondary side of the third single-phase current booster B3 is connected with a C-phase main loop of a tested object, a third current transformer LH2 is connected in series in a circuit of the secondary side of the third single-phase current booster B2 and the C-phase main loop S3 of the tested object, and a third ammeter A3 is connected with two ends of a third current transformer LH3 in. The third voltage V3 is connected in parallel to the secondary side of the third single-phase current booster B3 and is used for detecting the voltage of the secondary side of the third single-phase current booster B3. When the C-phase unbalanced current compensation circuit is connected, the sixth voltage transformer V6 is connected in parallel to the primary side of the sixth single-phase current booster B6, and is used to detect the primary side voltage of the sixth single-phase current booster B6.
In this embodiment, the power supply of the three-phase current rising main loop system and the power supply of the temperature rise test three-phase imbalance compensation system are shared, and phases are kept consistent.
The three single-phase current boosters adopted by the three-phase current boost main loop system of the embodiment are integrated in an integrated shell, and the three single-phase current boosters perform independent current boost, and the capacity of the three single-phase current boosters depends on the amplitude of unbalanced current to be compensated.
The total loop current value in the three-phase total loop of the tested article temperature rise test is the main loop current value output by the three-phase current rising main loop circuit and the compensation current provided by the balance compensation circuit.
Based on the above structure, the temperature rise test system of the present embodiment has the following functions:
(1) the operation function specifically includes: the on-off of a primary side switch of the voltage regulator, the voltage boosting/reducing of the voltage regulator, the reset protection, the operation of an alarm lamp and an alarm bell and the alarm bell sounding at any time.
(2) The measurement function specifically includes: the voltage and the current of the secondary side of the voltage regulator can be measured, and the accuracy is +/-3%; the accuracy of the secondary side voltage of the current booster can be measured to be +/-3%; the secondary side current of the current booster can be measured, and the accuracy is +/-1%.
(3) The state display function specifically includes: displaying the on-off state of a primary side switch of the voltage regulator; displaying the limiting state of the voltage boosting and reducing of the voltage regulator; displaying an overcurrent protection action; displaying the action of the switch cabinet; displaying a prompt that the switch of the trial zone door is not closed and the closing operation cannot be carried out; displaying a prompt that the emergency button cannot be switched on without resetting; displaying a prompt that the voltage regulator cannot perform switching-on operation when the voltage regulator is not at the minimum limit;
(4) the protection function specifically includes: the control system is provided with a voltage and current protection device, and when the voltage value and the current value reach the setting value of the device, the protection acts immediately; the control system sets the current protection values of the primary side and the secondary side of the transformer, and when the current exceeds the set value, the system automatically trips; and an emergency stop button is equipped for the test personnel to terminate the test in an emergency.
(5) The parameter setting function specifically includes: according to the test requirements, the parameter setting of the effective value of the total loop current can be realized, the parameter setting range is 100-1000A, and the compensation system carries out compensation according to the specific set required value.
Example 3:
now, according to the temperature rise test system proposed in embodiment 2, a compensation method is proposed, which can be seen in fig. 2, and specifically includes the following steps:
connecting a three-phase current rising main loop system and an unbalanced current compensation system into a main loop of a tested object; namely, the A-phase current rising main loop circuit and the A-phase unbalanced current compensation circuit are connected into an A-phase main loop S1 of a tested product, the B-phase current rising main loop circuit and the B-phase unbalanced current compensation circuit are connected into a B-phase main loop S2 of the tested product, and the C-phase current rising main loop circuit and the C-phase unbalanced current compensation circuit are connected into a C-phase main loop S3 of the tested product.
Applying test current to a tested product through a three-phase current rising main loop system, and stopping current rising to a main loop of any phase when the current value of the main loop of the tested product reaches the test current requirement value; at this time, the unbalanced current compensation system automatically detects the current value of the other two-phase total loop and automatically starts single-phase current rising, namely, the controller controls the corresponding single-phase current rising device to generate compensation current, and the generated compensation current is fed back to the corresponding total loop of the tested product.
When the current values of the other two phases of the main loops reach the test required values, the current rise is respectively stopped, and the three-phase current of the main loop reaches a balanced state.
In the test process, the unbalanced current compensation system detects the unbalanced state of the three-phase current of the main loop in real time and controls the output of the compensation current, so that the current three-phase balance in the whole test process is maintained, namely the compensation current is controlled to follow the instruction current in real time, and when the current of the main loop fluctuates in the temperature rise test process, the compensation current loop performs feedback adjustment. In the process of the temperature rise test, when the fluctuation of the effective value of the current of any one phase of the total loop of the temperature rise test of the tested object is larger than the protection set value, the three-phase total loop of the temperature rise test of the tested object automatically trips.
Claims (14)
1. The utility model provides a temperature-rise test unbalanced three phase compensating system which characterized in that: the three-phase unbalanced current compensation circuit comprises a three-phase unbalanced current compensation circuit, a current acquisition device A and a controller; the three-phase unbalanced current compensation circuit is correspondingly connected into a three-phase main loop of a temperature rise test of a tested product, and each phase of unbalanced current compensation circuit comprises a single-phase current booster A; the current acquisition device A acquires unbalanced current in a three-phase main loop of a temperature rise test of a tested object, converts the acquired unbalanced current into a proper format and inputs the format into the controller, the controller calculates a compensation instruction according to the acquired unbalanced current and sends the compensation instruction to a single-phase current booster A in an unbalanced current compensation circuit connected with a single-phase main loop of the temperature rise test of the tested object, in which the unbalanced current is detected, in real time, and the single-phase current booster A is controlled by the compensation instruction to inject the compensation current into the corresponding single-phase main loop of the temperature rise test of the tested object.
2. The temperature-rise test three-phase unbalance compensation system according to claim 1, characterized in that: the compensation current is obtained by the following formula: i ═ IO-I |, wherein IOThe current requirement value is a test current requirement value, I is the collected unbalanced current, and I' is the compensation current.
3. The temperature-rise test three-phase unbalance compensation system according to claim 1, characterized in that: for the single-phase unbalanced current compensation circuit, the primary side of the single-phase current booster A is connected in parallel with a corresponding single-phase main loop of the temperature rise test of the tested object.
4. The temperature-rise test three-phase unbalance compensation system according to claim 1, characterized in that: the single-phase unbalanced current compensation circuit further comprises a single-phase voltage regulator A for adjusting current, and the primary side of the single-phase voltage regulator A is connected with the secondary side of the single-phase current booster B in parallel.
5. The temperature-rise test three-phase unbalance compensation system according to claim 1, characterized in that: the current acquisition device A comprises a current transformer A and a current acquisition card A, the current transformer A is connected in series in a line of a single-phase main loop of the single-phase current booster A and the tested article temperature rise test for acquiring unbalanced current, the current acquisition card A is connected in parallel at two ends of the current transformer A, and signals acquired by the current transformer A are digitally converted.
6. A temperature rise test system is characterized in that: the three-phase current rising main loop system is used for inputting main loop current to a three-phase main loop of a temperature rise test of a tested product, and the temperature rise test three-phase unbalance compensation system of any one of claims 1 to 5 is included;
when the current value of any one phase of the total three-phase loop in the temperature rise test of the tested object reaches the test current requirement value, the unbalanced current compensation circuit connected with the other two-phase total loops in the temperature rise test of the tested object performs current compensation and current rise on the other two-phase total loops in the temperature rise test of the tested object, and when the current values of the total three-phase loop in the temperature rise test of the tested object reach the test current requirement value, the three-phase unbalanced compensation system in the temperature rise test stops current rise.
7. The temperature rise test system according to claim 6, wherein: the three-phase current rising main loop system comprises three-phase current rising main loop circuits, each phase current rising main loop circuit has the same structure and comprises a single-phase current rising device B, and the secondary side of the single-phase current rising device B is connected with a single-phase main loop of a temperature rise test of a tested article.
8. The temperature rise test system according to claim 7, wherein: each phase of the current rising main loop circuit further comprises a single-phase voltage regulator B and a compensation capacitor, wherein the primary side of the single-phase voltage regulator B is connected with a power supply, the secondary side of the single-phase voltage regulator B is connected with the primary side of the single-phase current rising device B in parallel, and the compensation capacitor is connected with the secondary side of the single-phase voltage regulator B in parallel.
9. The temperature-rise test system according to claim 8, wherein: each phase of current rising main loop circuit also comprises a current collecting device B and a voltmeter for detecting the secondary side voltage of the single-phase current rising device B; the current collecting device B comprises a current transformer B and a current collecting card B, the current transformer B is connected in series with the secondary side of the single-phase current booster B and a line of a single-phase main loop of a temperature rise test of a tested object for current collection, and the current collecting card B is connected in parallel with two ends of the current transformer B.
10. The temperature rise test system according to claim 6, wherein: the device also comprises a voltmeter used for detecting the primary side voltage of the single-phase current booster B in the single-phase unbalanced current compensation circuit.
11. The temperature rise test system according to claim 6, wherein: and the power supply of the three-phase current rising main loop system is shared with the power supply of the temperature rise test three-phase unbalance compensation system.
12. A temperature rise test three-phase unbalance compensation control method is characterized by comprising the following steps: the method specifically comprises the following steps:
applying test current to a three-phase main loop of a temperature rise test of a tested article, and stopping current rising of the main loop of the phase of the temperature rise test of the tested article when the current value of any one-phase main loop of the temperature rise test of the tested article reaches the test current requirement value;
obtaining the current value of the other two-phase total loop of the temperature rise test of the tested object, calculating and generating corresponding compensation current according to the current value, and feeding the generated compensation current back to the other two-phase total loop of the temperature rise test of the corresponding tested object;
when the current value of the other two-phase total loop of the temperature rise test of the tested object reaches the test current requirement value, the current rise is stopped, and the current of the temperature rise test of the tested object reaches a balanced state.
13. The temperature-rise test three-phase unbalance compensation control method according to claim 12, characterized in that: and when the fluctuation of the effective value of any phase of total current of the tested object in the temperature rise test process is larger than the protection set value, the three-phase total loop of the tested object in the temperature rise test automatically trips.
14. The temperature-rise test three-phase unbalance compensation control method according to claim 12, characterized in that: the compensation current is obtained by the following formula: i ═ IO-I |, wherein IOThe current requirement value is a test current requirement value, I is the collected unbalanced current, and I' is the compensation current.
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