CN204832449U - Electronic type direct current breaker detection device and system - Google Patents

Abstract

The utility model relates to an electronic direct current circuit breaker detection device and system. The detection device includes a power supply module for providing voltage and current for the electronic DC circuit breaker, a discharge circuit module and a first control switch for discharging excess electric energy of the power supply, and the discharge circuit module is connected in parallel with the power supply module. A control switch and an electronic DC circuit breaker are connected in series on the power supply circuit formed by the power supply module, the discharge circuit module includes a second control switch, and the second control switch is connected in parallel with the power supply module. The detection system includes the above detection device and an electronic DC circuit breaker. According to the structural characteristics of the electronic direct current circuit breaker, an electronic direct current circuit breaker detection device is provided, which can effectively detect the electronic direct current circuit breaker.

Description

An electronic DC circuit breaker detection device and system

technical field

The utility model relates to an electronic direct current circuit breaker detection device and system, belonging to the technical field of high voltage direct current transmission.

Background technique

The development of DC transmission technology has been relatively mature, but compared with the flexible and diverse connection methods of AC transmission systems, most of the DC systems in operation in the world still use two-terminal systems. The main reason is the lack of practical high-voltage DC circuit breakers. With the further development of DC transmission technology, multi-terminal DC transmission and DC transmission and distribution grid will inevitably become a new development direction. As the switchgear that plays the double role of control and protection in the system, the research and development of HVDC circuit breaker has very important significance.

The topological structure of the high-voltage electronic DC circuit breaker is shown in Figure 1. It consists of a high-speed mechanical switch QS in series with an auxiliary electronic switch V1 and then a main electronic switch V2 in parallel. The auxiliary electronic switch V1 consists of a single or multiple parallel semiconductor devices. , its off-state voltage is low to ensure low loss during normal operation, and the main electronic switch V2 is composed of multi-level semiconductor devices in series, which can withstand higher voltage.

During normal operation, the high-speed mechanical switch QS is closed, the auxiliary electronic switch V1 is turned on, and the main electronic switch V2 is turned off. The current flows through the branch connected in series between the auxiliary electronic switch V1 and the high-speed mechanical switch QS, and the loss is small. When the electronic DC circuit breaker is closed, first turn on the main electronic switch V2, the current flows through the main electronic switch branch, then turn on the auxiliary electronic switch V1 and close the high-speed mechanical switch QS, then turn off the main electronic switch V2, the current is transferred to the auxiliary Electronic switch V1 and high-speed mechanical switch QS are connected in series. When opening, first turn on the main electronic switch V2, and then turn off the auxiliary electronic switch V1, forcing the current to transfer to the main electronic switch branch. After withstanding the voltage capability, turn off the main electronic switch V2 to complete the opening process of the electronic DC circuit breaker.

Since most of the components in the electronic DC circuit breaker are electronic components, the performance test cannot be carried out according to the current conventional electromagnetic circuit breaker standards and detection devices.

Moreover, it can be seen from the working principle of the high-voltage electronic DC circuit breaker that in order to complete its opening and closing tests, the test circuit needs to be able to provide DC high voltage and large current.

Utility model content

The purpose of the utility model is to provide an electronic DC circuit breaker detection device to solve the problem that the traditional electromagnetic circuit breaker detection device cannot be used on the electronic DC circuit breaker. At the same time, the utility model provides an electronic DC circuit breaker detection system.

In order to achieve the above purpose, the solution of the present invention includes an electronic DC circuit breaker detection device, including a power supply module for providing voltage and current for the electronic DC circuit breaker, and a power supply module for discharging excess electric energy of the power supply module. The discharge circuit module and the first control switch, the discharge circuit module is connected in parallel with the power supply module, the power supply module has two ports, the two ports are connected to a power supply circuit, the first control A switch and an electronic DC circuit breaker are connected in series on the power supply circuit; the discharge circuit module includes a second control switch, and the second control switch is connected in parallel with the power supply module.

The power supply module includes a charging power supply, a charging switch and a power supply capacitor. The power supply capacitor has two interfaces, and the two interfaces are connected to a charging circuit. The charging power supply and the charging switch are connected in series on the charging circuit. The two interfaces of the power supply capacitor are two ports of the power supply module.

An inductor is also connected in series with the power supply circuit.

The first control switch is a thyristor.

The second control switch is an IGBT, the IGBT is connected in parallel with the power supply module, and the IGBT is connected in antiparallel with a diode.

An electronic DC circuit breaker detection system, the detection system includes an electronic DC circuit breaker detection device and an electronic DC circuit breaker, the detection device includes a power supply module for providing voltage and current for the electronic DC circuit breaker . A discharge circuit module and a first control switch for discharging excess electric energy of the power supply module, the discharge circuit module is connected in parallel with the power supply module, the power supply module has two ports, and the two Each port is connected to a power supply circuit, and the first control switch and the electronic DC circuit breaker are connected in series on the power supply circuit; the discharge circuit module includes a second control switch, and the second control switch is connected to the power supply circuit The power modules are connected in parallel.

The power supply module includes a charging power supply, a charging switch and a power supply capacitor. The power supply capacitor has two interfaces, and the two interfaces are connected to a charging circuit. The charging power supply and the charging switch are connected in series on the charging circuit. The two interfaces of the power supply capacitor are two ports of the power supply module.

An inductor is also connected in series with the power supply circuit.

The first control switch is a thyristor.

The second control switch is an IGBT, the IGBT is connected in parallel with the power supply module, and the IGBT is connected in antiparallel with a diode.

Firstly, according to the structural features of the electronic DC circuit breaker, the utility model provides an electronic DC circuit breaker detection device specifically aimed at the structural features, which can effectively detect the electronic DC circuit breaker.

Moreover, the device includes a power supply module for providing voltage and current for the electronic DC circuit breaker, and uses a capacitor as the power supply, and utilizes the characteristics that the capacitor can provide high voltage and large current to provide the detection necessary for the electronic DC circuit breaker. The high voltage and high current, the most basic parameter conditions for detection have been met.

The capacitor can be put into detection at any time through a special charging power supply, and by controlling the control switch on the power supply circuit, it can provide the electronic DC circuit breaker with the necessary high voltage and high current for detection at any time, which meets the timeliness of detection.

In addition, the two ends of the capacitor are connected in parallel with a discharge circuit module, and after the detection is completed, the excess electric energy on the capacitor is discharged by using the discharge circuit module.

Description of drawings

Figure 1 is a schematic circuit diagram of a high-voltage electronic DC circuit breaker;

Figure 2 is a schematic diagram of the overall structure of the electronic DC circuit breaker detection system;

Fig. 3 is a circuit diagram of an electronic DC circuit breaker detection system.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Embodiment of Electronic DC Circuit Breaker Detection System

As shown in Figure 2, it is a schematic diagram of the overall structure of the electronic DC circuit breaker detection system. The electronic DC circuit breaker detection system includes a detection device and an electronic DC circuit breaker. The electronic DC circuit breaker detection device includes a power supply module for providing voltage and current for the electronic DC circuit breaker, and a redundant power supply module for discharging The electric energy discharge circuit module and the first control switch, the discharge circuit module and the power supply module are connected in parallel, the power supply module has two ports, these two ports are connected to a power supply circuit, the first control switch and the electronic DC circuit breaker are connected in series connected to the power supply circuit.

As shown in Figure 3, the power supply module is composed of a charging power supply U1, a current limiting resistor R1, an isolating switch QS1, and a capacitor bank C. The two ends of group C are the output ends of the power supply module. The capacity of the capacitor bank C is adjustable to meet the requirements of different test voltages and currents; the charging process of the capacitor bank C is controllable, and the capacitor bank C can be controlled to charge to the voltage specified by the test.

The capacitor bank C can discharge excess electric energy through the discharge circuit module. The discharge circuit module is composed of discharge resistor R2, IGBTV4, diode D1 and diode D2, wherein the discharge resistor R2, IGBTV4 and diode D2 are connected in series, and the series circuit is connected at both ends of the capacitor bank C in parallel. Diode D1 is connected in antiparallel to both ends of IGBT4. Antiparallel diode D1 can prevent the reverse breakdown of both ends of IGBT. Since both ends of IGBT are inductive loads, when IGBT is turned off, the current flowing through the inductive load cannot A sudden change will generate an instantaneous high voltage at both ends of the inductive load. Under the action of this high voltage, the diode D1 will be turned on, which can conduct the circuit in time and prevent the IGBT from being broken down by the instantaneous high voltage.

The above-mentioned first control switch is a thyristor V3, and a reactor L is connected in series on the power supply line of the electronic DC circuit breaker. When testing the electronic DC circuit breaker, cooperate with the opening and closing sequence of the electronic DC circuit breaker to control the thyristor V3, and the capacitor bank C discharges through the reactor L to provide DC high voltage and large current for the circuit breaker under test; the test is over After that, the IGBT switching valve V4 is opened, and the capacitor bank C is discharged through the discharge circuit.

Before the detection, the main electronic switch V2 in the electronic DC circuit breaker is in the off state, the auxiliary electronic switch V1 is in the off state, and the high-speed mechanical switch QS is in the position; in this detection device, the thyristor V3 is in the off state , the IGBT switch tube V4 is in the disconnected state, the isolation switch QS1 is closed, the charging power supply charges the capacitor bank C to a specified voltage value, and then QS1 is disconnected.

Then carry out the opening and closing detection of the circuit breaker, the specific detection process is as follows:

First, perform closing detection:

Give the thyristor V3 a trigger signal to turn on the power supply circuit. When the thyristor V3 receives the trigger signal for a period of time, turn on the main electronic switch V2 in the circuit breaker. After the main electronic switch V2 is turned on, the capacitor bank C, the thyristor V3, and the reactor L and the main electronic switch V2 in the circuit breaker form a discharge circuit, and the detection current flows through the branch of the main electronic switch V2. After the main electronic switch V2 is turned on, the high-speed mechanical switch QS is turned on, and the auxiliary electronic switch V1 is turned on. After the high-speed mechanical switch QS is turned on, the main electronic switch V2 is turned off, and the detection current is transferred from the branch of the main electronic switch V2 to the auxiliary electronic switch V1 and On the series branch of the high-speed mechanical switch QS, the closing of the electronic DC circuit breaker is completed.

After running for a period of time, the switch-off detection starts:

When performing closing detection, the main electronic switch V2 is in the off state, the auxiliary electronic switch V1 is in the on state, the high-speed mechanical switch QS is in the closed position, and the detection current flows through the series branch of the auxiliary electronic switch V1 and the high-speed mechanical switch QS.

At the beginning of the opening detection, the main electronic switch V2 is turned on first, and after the main electronic switch V2 is turned on, the auxiliary electronic switch V1 is turned off, the detection current is transferred to the branch of the main electronic switch V2, and then the high-speed mechanical switch QS is turned off, and the high-speed mechanical switch QS is turned off. After opening, turn off the main electronic switch V2, and after the main electronic switch V2 is turned off, the opening of the electronic DC circuit breaker is completed.

When the main electronic switch V2 is turned off, the energy stored in the reactor L is discharged through the arrester F1 connected in parallel with the electronic DC circuit breaker.

After the entire detection is over, give the IGBT switch tube V4 a trigger signal to turn on the IGBT switch tube V4, the capacitor bank C, the discharge resistor R2, the IGBT switch tube V4 and the diode D2 form a discharge circuit, and the capacitor bank C passes through the discharge circuit Discharge the excess electric energy on its body.

In the above embodiments, the power supply module is composed of a charging power supply U1, a current limiting resistor R1, an isolating switch QS1 and a capacitor bank C. As other embodiments, the power supply module can also directly be a DC power module or an ACDC conversion module.

In the above embodiments, the first control switch is a thyristor V3. As other embodiments, the first control switch may also be a MOS transistor, a triode or other controllable switches.

In the above embodiments, the second control switch is an IGBT switch tube. As other embodiments, the second control switch may also be a MOS tube, a triode or other controllable switch tubes.

In the above embodiments, the power supply loop is connected in series with an inductor. As other embodiments, no inductor may be provided on the power supply loop.

Embodiment of Electronic DC Circuit Breaker Detection Device

The embodiment of the electronic DC circuit breaker detection device has been described in detail in the above-mentioned system embodiment, and will not be repeated here.

Specific implementations have been given above, but the utility model is not limited to the described implementations. The basic idea of the present utility model lies in the above-mentioned basic scheme. For those of ordinary skill in the art, according to the teaching of the present utility model, it does not need to spend creative labor to design various deformation models, formulas and parameters. Changes, modifications, replacements and modifications to the embodiments without departing from the principle and spirit of the present utility model still fall within the protection scope of the present utility model.

Claims (10)

1. an electronic direct-current detection device for circuit breaker, it is characterized in that, comprise for providing the power supply module of voltage and current for electronic direct-current isolating switch, for the leadage circuit module of the unnecessary electric energy of described power supply module of releasing and the first gauge tap, described leadage circuit module and described power supply wired in parallel, described power supply module has two ports, described two ports connect a current supply circuit, and described first gauge tap and electronic direct-current isolating switch are serially connected on described current supply circuit; Described leadage circuit module comprises the second gauge tap, described second gauge tap and described power supply wired in parallel.

2. electronic direct-current detection device for circuit breaker according to claim 1, it is characterized in that, described power supply module comprises charge power supply, charge switch and power supply electric capacity, described power supply electric capacity has two interfaces, described two interfaces connect a charge circuit, described charge power supply and charge switch are serially connected on described charge circuit, and two interfaces of described power supply electric capacity are two ports of described power supply module.

3. electronic direct-current detection device for circuit breaker according to claim 1, is characterized in that, described current supply circuit is also serially connected with inductance.

4. electronic direct-current detection device for circuit breaker according to claim 1, is characterized in that, described first gauge tap is thyristor.

5. electronic direct-current detection device for circuit breaker according to claim 1, is characterized in that, described second gauge tap is IGBT, and described IGBT and described power supply wired in parallel, described IGBT is in parallel with a diode reverse.

6. an electronic direct-current isolating switch detection system, it is characterized in that, described detection system comprises electronic direct-current detection device for circuit breaker and electronic direct-current isolating switch, described pick-up unit comprises the power supply module for providing voltage and current for electronic direct-current isolating switch, for leadage circuit module and first gauge tap of the unnecessary electric energy of described power supply module of releasing, described leadage circuit module and described power supply wired in parallel, described power supply module has two ports, described two ports connect a current supply circuit, described first gauge tap and electronic direct-current isolating switch are serially connected on described current supply circuit, described leadage circuit module comprises the second gauge tap, described second gauge tap and described power supply wired in parallel.

7. electronic direct-current isolating switch detection system according to claim 6, it is characterized in that, described power supply module comprises charge power supply, charge switch and power supply electric capacity, described power supply electric capacity has two interfaces, described two interfaces connect a charge circuit, described charge power supply and charge switch are serially connected on described charge circuit, and two interfaces of described power supply electric capacity are two ports of described power supply module.

8. electronic direct-current isolating switch detection system according to claim 6, is characterized in that, described current supply circuit is also serially connected with inductance.

9. electronic direct-current isolating switch detection system according to claim 6, is characterized in that, described first gauge tap is thyristor.

10. electronic direct-current isolating switch detection system according to claim 6, is characterized in that, described second gauge tap is IGBT, and described IGBT and described power supply wired in parallel, described IGBT is in parallel with a diode reverse.