CN102798775A - Large-current impact generation system and test method thereof - Google Patents

Abstract

The invention discloses a large current impact generating system and a test method thereof. The system includes sequentially connected relays, a control circuit, an autovoltage regulator, a step-up transformer and a coil, a transformer set on the coil, and a receiving transformer. A measurement system for the induced current. The self-coupling voltage regulator of the present invention outputs AC voltage, and the output terminal of the step-up transformer generates low voltage and high current to superimpose K times high current on the copper coil with the corresponding number of turns, and finally uses the time relay to control the short-circuit current and output time It Relationship, use the oscilloscope to complete the measurement of large current, to achieve the purpose of high current short circuit impact. In terms of time control, the present invention adds a time state sequence, so that the whole system can operate normally, and at the same time, it can also achieve the following effects: 1) high time precision control; 2) time state arbitrary combination control; 3) high automation level, can Completely realize the state of separation between human and system; 4) High safety factor.

Description

A large current impact generating system and its test method

technical field

The invention relates to the technical field of testing, in particular to a large current impact generating system and a testing method thereof.

Background technique

At present, various systems with large current generation are widely used in the field of high-current short-circuit impulse tests such as fault indicators. Such a system usually uses the impact power transformer, impedance, data acquisition and time control to achieve the purpose of large current impact in a certain operation sequence (program). Due to the operation of fault indicators and other products in the power system (on the line), it is required to be able to withstand the corresponding on-site short-circuit fault high-current impact without damage. In order to ensure the safe operation of power systems or lines, it is necessary to use power switches, fault indicators and other equipment that can withstand the impact of large current short circuits. However, it is very complicated to set up or build such a short-circuit impact high-current system in the laboratory, which requires relatively more equipment and manpower, especially for manufacturers to build this system. The problem of how to save manpower, material resources and test sites is very urgent. Usually, the way for manufacturers to test out the factory or to find out the technology is to go to the corresponding laboratory to do the test. These modes are effective but also have many problems: 1, consume manpower and financial resources. 2. The test time is short, and it is difficult to see or measure specific problems. 3. The corresponding laboratory needs to invest a large number of personnel to build and operate the high current impact system. 4. It is not suitable for long-term technical investigation of manufacturers. Therefore, the high-current short-circuit impact of fault indicators or corresponding products is a difficult problem for manufacturers or laboratories, which has not been effectively solved for a long time.

Do high-current short-circuit impact tests in laboratories or manufacturers, including some 220kV transformers, 10kV impact transformers, high-voltage impedances and low-voltage impedances, etc. No matter what method they have, they all have a common feature, that is, they all need to build high-current Short circuit impact test system. Their common disadvantage is that the test site is relatively large, and the manpower and material resources invested are relatively high.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides a high-current impact generation system and its test method, which effectively avoids the problems of large test sites and high input of manpower and material resources in the prior art, and has high practicality. value and economic value.

The improvement of a large current impact generation system provided by the present invention is that the system includes a relay K, a control circuit, an autovoltage regulator T1, a step-up transformer T2, a coil L, a transformer H and a measurement system;

The relay K, the control circuit, the autovoltage regulator T1, the step-up transformer T2 and the coil L are sequentially connected; the transformer H is set on the coil L, and the induced current is transmitted to the measurement system; The control circuit controls the relay K.

Wherein, the input end of the coil L is connected to the output end of the secondary side of the step-up transformer T2, and the output end of the coil L is connected to the input end of the secondary side of the step-up transformer T2.

Wherein, the coil L is a copper coil.

Wherein, the number of turns of the coil L is the same as the number of turns of the secondary side of the step-up transformer T2.

Wherein, the measurement system includes a computer or a wave recorder.

The present invention provides a test method for a high-current impact generation system based on another purpose. The improvement is that the method includes the following steps:

(1) Setting the inrush current value generated by the high-current inrush generating system;

(2) Add a time control unit to the control circuit;

(3) Set the control circuit to the automatic control mode to generate an inrush current value.

Wherein, the time control unit includes a time state sequence control component for setting the time state sequence.

Among them, it is judged whether the inrush current value generated in step (3) is equal to the set inrush current value, and if not, adjust the parameters of the high-current inrush generating system so that the inrush current value generated is equal to the set inrush current value.

Wherein, the parameters of the high current surge generation system include the ratio of the step-up transformer T2.

Compared with the prior art, the beneficial effects of the present invention are:

The present invention is simple to build a system and is easy to realize through existing devices.

The invention requires less manpower, material resources and financial resources, saving resources and costs.

The present invention occupies very little space.

The safety factor of the invention is high, which effectively guarantees personal safety and property safety.

The invention adds a time control unit in the control circuit, which can well control the time of the inrush current in the whole circuit.

Description of drawings

Fig. 1 is a schematic diagram of a high-current short-circuit impact system provided by the present invention.

Fig. 2 is a schematic diagram of the self-coupling voltage regulator T1 provided by the present invention.

Fig. 3 is a schematic diagram of the step-up transformer T2 provided by the present invention.

FIG. 4 is a schematic diagram of a current coil L provided by the present invention.

Among them, T1 is an autotransformer; T2 is a step-up transformer; L is a coil; H is a transformer; K is a time relay.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

The high-current short-circuit impact system provided in this embodiment is shown in Figure 1, and the system includes a time relay K, a control circuit, an autovoltage regulator T1, a step-up transformer T2, a coil L, a transformer H and a measurement system; The voltage regulator T1 is shown in Figure 2, the step-up transformer T2 is shown in Figure 3, and the current coil L is shown in Figure 4.

The primary side of the autotransformer T1 is connected to the AC power supply, its secondary side is connected to the primary side of the step-up transformer T2, the output terminal of the secondary side of the step-up transformer T2 is connected to the input terminal of the coil L, and the secondary side of the step-up transformer T2 The edge input is connected to the output of the coil L. The transformer H is set on the coil L and transmits the induced current to the measurement system. The control circuit is used to control the time relay K.

Wherein, the coil L is a copper coil. The number of turns of the coil L is the same as the number of turns of the secondary side of the step-up transformer T2, and the wire diameter of the coil is determined according to the capacity of the autotransformer, which is generally taken as 2.5mm ² .

Wherein, the measurement system includes a computer or a wave recorder.

The autotransformer in this embodiment outputs AC voltage, and the output terminal of the step-up transformer generates low voltage and high current to superimpose K times (K: the number of copper coil turns) high current on the copper coil with the corresponding number of turns, and finally Use a time relay (or other electronic circuit) to control the relationship between the short-circuit current and the output time I-t, control the high current impact time (that is, when the high current impacts to a certain value, the entire circuit is disconnected, and the system is powered off), and the wave recorder is used to complete the large current. The measurement is to achieve the purpose of high current short circuit impact. In terms of time control, the present invention adds a time state sequence so that the entire system can operate normally, and at the same time achieve the following effects: 1) high time precision control; 2) time state arbitrary combination control; 3) higher automation level, The state of separation between human and system can be completely realized; 4) The safety factor is high. For example: when using the time state sequence to control the high-current short-circuit impact system, it can be set that the system will be powered off for XX seconds after power-on, and the system will restart after XX seconds of power-off, reciprocating cycle.

In this embodiment, the final high-current generating device is an N-turn coil, and the number of turns of the coil can be changed according to the needs of both the laboratory and the manufacturer. The final short-circuit impulse current value is determined by the measurement system. In order to achieve the best or highest short-circuit current impact value within the smallest capacity range, the choice of coil material should be appropriate, and the material with smaller impedance should be selected. When the large current measured by the measurement system is greater or less than the expected value, the operator can properly adjust the output of the step-up transformer T2 to change the output current value of the step-up transformer to determine whether the current value meets the requirements and whether it can meet the expectations Purpose.

The invention can realize the high-current short-circuit test by improving and reducing the system, improves the safety factor in the test process, and thus effectively improves the test efficiency.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims (9)

1. a heavy current impact generation systems is characterized in that, said system comprises relay K, control circuit, automatic coupling voltage regulator T1, rising current transformer T2, coil L, mutual inductor H and measuring system;

Said relay K, control circuit, automatic coupling voltage regulator T1, rising current transformer T2 and coil L are connected successively; Said mutual inductor H is enclosed within on the said coil L, and the electric current that induces is passed to said measuring system; Said control circuit is controlled said relay K.

2. heavy current impact generation systems as claimed in claim 1 is characterized in that, said coil L input end is connected with said step-up transformer T2 secondary output terminal, and said coil L output terminal is connected with said step-up transformer T2 secondary input end.

3. heavy current impact generation systems as claimed in claim 1 is characterized in that, said coil L is a copper coil.

4. heavy current impact generation systems as claimed in claim 1 is characterized in that, the number of turn of said coil L is identical with the said rising current transformer T2 secondary number of turn.

5. heavy current impact generation systems as claimed in claim 1 is characterized in that said measuring system comprises computing machine or oscillograph.

6. the test method of a heavy current impact generation systems is characterized in that, said method comprises the steps:

(1) sets the dash current value that said heavy current impact generation systems produces;

(2) joining day control module in control circuit;

(3) control circuit is set at automatic control mode, produces the dash current value.

7. test method as claimed in claim 6 is characterized in that, said time control unit comprises time state sequence Control Component, is used for the setting-up time status switch.

8. test method as claimed in claim 6; It is characterized in that; Whether the dash current value that determining step (3) produces is equivalent with the dash current value of setting, if do not wait the parameter of then adjusting said heavy current impact generation systems, and the dash current value that makes the dash current value of generation equal to set.

9. test method as claimed in claim 6 is characterized in that the parameter of said heavy current impact generation systems comprises the ratio of rising current transformer T2.

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