CN211701471U - Direct current power grid fault current controller - Google Patents
Direct current power grid fault current controller Download PDFInfo
- Publication number
- CN211701471U CN211701471U CN201922194351.1U CN201922194351U CN211701471U CN 211701471 U CN211701471 U CN 211701471U CN 201922194351 U CN201922194351 U CN 201922194351U CN 211701471 U CN211701471 U CN 211701471U
- Authority
- CN
- China
- Prior art keywords
- contactor
- circuit
- series
- controller
- primary circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 8
- 230000001052 transient effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Images
Landscapes
- Direct Current Feeding And Distribution (AREA)
Abstract
The utility model discloses a DC power grid fault current controller, which comprises a primary circuit and a controller; the primary circuit comprises an inductor, a filter capacitor, a resistor, an IGBT switch, a diode, a contactor and a current Hall sensor; the inductor, the first resistor and the second contactor are connected in series to form a series circuit; the series circuit is connected with the first contactor in parallel; the second resistor and the first diode are connected in series to form a first branch circuit; the third resistor and the second diode are connected in series to form a second branch circuit; the first branch circuit and the second branch circuit are connected with the inductor in parallel; the filter capacitor and the IGBT switch are connected with the first resistor in parallel; the current Hall sensor is arranged on the series circuit; the controller controls different opening and closing combinations of the IGBT switch and the 2 contactors in the primary circuit, so that the primary circuit forms different working modes. The utility model discloses can realize direct current electric wire netting fault protection, avoid interim feeder trouble can not lead to direct current electric wire netting main power source shutting and arouse whole direct current distribution network power failure.
Description
Technical Field
The utility model relates to a direct current electric wire netting fault current controller especially relates to a controller that protection DC power supply does not block at once under feeder fault among the low voltage distribution network, belongs to the novel topology of low voltage direct current distribution network and control technical field.
Background
When a certain direct current load in the direct current power distribution network has a fault, the load feeder switch is not separated from the direct current power supply, the direct current power supply can detect the fault current and is locked immediately (us level), the whole direct current power distribution network is powered off, and other loads are also forced to be powered off.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at overcomes not enough among the prior art, provides a direct current electric wire netting fault current controller, can realize direct current electric wire netting fault protection, has avoided interim feeder trouble can not lead to direct current electric wire netting main power source shutting and arouse whole direct current distribution network power failure.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a direct current power grid fault current controller comprises a primary circuit and a controller;
the primary circuit comprises an inductor, a filter capacitor, a resistor, an IGBT switch, a diode, a contactor and a current Hall sensor;
the inductor, the first resistor and the second contactor are connected in series to form a series circuit; the series circuit is connected with the first contactor in parallel;
the second resistor and the first diode are connected in series to form a first branch circuit;
the third resistor and the second diode are connected in series to form a second branch circuit;
the first branch circuit and the second branch circuit are connected with the inductor in parallel; the filter capacitor and the IGBT switch are connected with the first resistor in parallel;
the current Hall sensor is arranged on the series circuit;
the controller controls different opening and closing combinations of the IGBT switch and the 2 contactors in the primary circuit, so that the primary circuit forms different working modes.
Further, the operation mode includes:
mode 1: normal operation conditions;
mode 2: instantaneous fault conditions;
mode 3: permanent fault conditions;
mode 4: bypass shutdown conditions.
Further, the primary circuit has two ports, and is connected in series with a line to be protected in the dc power grid through the two ports.
Further, when the controller controls the IGBT switch to be closed, the second contactor to be closed and the first contactor K1 to be opened, the primary circuit is in a normal operation condition.
Further, when the controller controls the IGBT switch to be switched off, the second contactor to be switched on and the first contactor to be switched off, the primary circuit is in an instantaneous fault working condition.
Further, when the controller controls the IGBT switch to be switched off, the second contactor to be switched off and the first contactor to be switched off, the primary circuit is in a permanent fault working condition.
Further, when the controller controls the IGBT switch to be switched off, the second contactor to be switched off and the first contactor to be switched on, the primary circuit is in a bypass shutdown working condition.
Further, the current hall sensor is disposed beside the second contactor in the series circuit for measuring a current flowing through the second contactor.
Further, the operation mode includes:
in the mode 1, the IGBT switch is closed, the second contactor is closed, the first contactor K1 is opened, and the primary circuit is in a normal operation condition;
in the mode 2, the IGBT switch is switched off, the second contactor is switched on, the first contactor is switched off, and the primary circuit is in an instantaneous fault working condition;
in the mode 3, when the IGBT switch is disconnected, the second contactor is disconnected and the first contactor is disconnected, the primary circuit is in a permanent fault working condition;
in the mode 4, when the IGBT switch is switched off, the second contactor is switched off and the first contactor is switched on, the primary circuit is in a bypass shutdown working condition;
the protection threshold is set to a first threshold I1, a second threshold I2, and I1< I2;
self-checking whether the direct current power grid fault current controller equipment has a fault or not, and working in a mode 4 when the fault occurs;
when the direct current distribution network normally operates, the primary circuit works in a mode 1;
when 3 points are continuously sampled and are greater than a first threshold value I1 or 1 point is sampled and is greater than a second threshold value I2, an IGBT switch of a primary circuit is disconnected, a line is considered to be in fault, and a mode 2 is entered;
and when the state time of the mode 2 exceeds a first set time period or enters the mode 2 twice in a continuous second set time period, the second contactor K is opened, the permanent fault is considered, and the mode 3 is entered.
Mode 4 is a bypass condition and the device is not used under normal conditions.
Compared with the prior art, the utility model discloses the beneficial effect who has is:
the utility model provides a current electric wire netting direct current fault current controller, thereby direct current fault current controller can cooperate the protection strategy with DC power supply when detecting fault current and restrict the line current value, protection DC power supply resumes normal operating mode again after waiting for the trouble feeder disconnection, has avoided interim feeder trouble can not lead to direct current electric wire netting main power source shutting and arouse whole direct current distribution network power failure.
The foregoing is only an outline of the technical solutions of the present invention, and the present invention will be further described with reference to the accompanying drawings for clearer understanding of the technical means of the present invention.
Drawings
Fig. 1 is a schematic diagram of a topology structure of a dc grid fault current controller according to the present invention;
fig. 2 shows a typical manner of the present invention for accessing a dc power distribution network to a dc grid fault current controller;
FIG. 3 illustrates the normal operation of the primary circuit in mode 1;
FIG. 4 illustrates a transient fault condition of the primary circuit in mode 2;
FIG. 5 illustrates a permanent fault condition of the primary circuit in mode 3;
FIG. 6 illustrates the bypass shutdown condition of the primary circuit in mode 4.
Fig. 7 is a logic block diagram of the controller of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The utility model discloses an add direct current fault current controller in the direct current network, thereby direct current fault current controller can cooperate the protection strategy with DC power supply when detecting fault current and restrict the line current value, protection DC power supply resumes normal operating mode again after waiting for the disconnection of trouble feeder.
The utility model discloses a DC power grid fault current controller, the working environment is a DC power distribution network, comprising a primary circuit and a controller;
the primary circuit is shown in fig. 1, and comprises 1 inductor L, 1 filter capacitor C, 3 resistors R, R1, R2, 1 IGBT switch VT, 2 diodes V1, V2, 2 contactors K1, K2 and 1 current hall sensor S; the resistance R1 and the diode V1 are connected in series to form a first series branch, the resistance R2 and the diode V2 are connected in series to form a second series branch, the first series branch and the second series branch are connected with the inductance L in parallel, the filter capacitor C and the resistance R are connected with the IGBT switch VT in parallel, the inductance L and the resistance R are connected with the contactor K2 in series, and then the contactor K1 is connected in parallel integrally, wherein the current Hall sensor measures the current flowing through the contactor K2.
The primary circuit has two ports D1, D2, connected in series in the line to be protected in the dc grid, as shown in fig. 2.
The controller can control different opening and closing combinations of an IGBT switch and 2 contactors in the primary circuit, so that the primary circuit works in four different working modes, and the four working modes of the direct-current fault current controller are respectively as follows:
mode 1: normal operating conditions, as shown in FIG. 3;
mode 2: transient fault conditions, as shown in FIG. 4;
mode 3: permanent fault conditions, as shown in FIG. 5;
mode 4: bypass shutdown conditions, as shown in FIG. 6.
In the normal operation condition, as shown in fig. 3, the IGBT switch VT is closed, the contactor K2 is closed, and the contactor K1 is opened.
In the transient fault condition, as shown in fig. 4, the IGBT switch VT is turned off, the contactor K2 is turned on, and the contactor K1 is turned off.
The permanent fault condition, as shown in fig. 5, is that the IGBT switch VT is open, the contactor K2 is open, and the contactor K1 is open.
In the bypass shutdown condition, as shown in fig. 6, the IGBT switch VT is turned off, the contactor K2 is turned off, and the contactor K1 is turned on.
As shown in fig. 7, the protection threshold values are set to I1, I2 (I1 < I2), the sampling rate is set to f, the dc grid fault current controller self-checks whether a fault exists in the equipment, operates in mode 4 when the fault exists, when the dc distribution network normally operates, the primary circuit operates in mode 1, continuously samples 3 points greater than I1, or samples 1 point greater than I2, it is considered that a line is faulty, the VT of the primary circuit operates in mode 2, when the state time of mode 2 exceeds 3s or after the primary circuit enters mode 2 twice within 3s continuously, it is considered that a permanent fault occurs, and K2 opens and enters mode 3. Mode 4 is a bypass condition and the device is not used under normal conditions.
The utility model discloses an innovation point lies in, the utility model provides a current electric wire netting direct current fault current controller, thereby can cooperate the protection strategy with DC power supply when DC fault current controller detects fault current and restrict the line current value, protection DC power supply resumes normal operating mode again after waiting for the trouble feeder disconnection, has avoided interim feeder trouble can not lead to DC power net main power supply shutting and arouses whole DC distribution network power failure.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A direct current electric network fault current controller which characterized in that: the circuit comprises a primary circuit and a controller;
the primary circuit comprises an inductor, a filter capacitor, a resistor, an IGBT switch, a diode, a contactor and a current Hall sensor;
the inductor, the first resistor and the second contactor are connected in series to form a series circuit; the series circuit is connected with the first contactor in parallel;
the second resistor and the first diode are connected in series to form a first branch circuit;
the third resistor and the second diode are connected in series to form a second branch circuit;
the first branch circuit and the second branch circuit are connected with the inductor in parallel; the filter capacitor and the IGBT switch are connected with the first resistor in parallel;
the current Hall sensor is arranged on the series circuit;
the controller controls different opening and closing combinations of the IGBT switch and the 2 contactors in the primary circuit, so that the primary circuit forms different working modes.
2. The dc grid fault current controller of claim 1, wherein: the working modes comprise:
mode 1: normal operation conditions;
mode 2: instantaneous fault conditions;
mode 3: permanent fault conditions;
mode 4: bypass shutdown conditions.
3. The dc grid fault current controller of claim 1, wherein: the primary circuit has two ports, and is connected in series in a line to be protected in the direct current power grid through the two ports.
4. The dc grid fault current controller of claim 1, wherein: when the controller controls the IGBT switch to be closed, the second contactor to be closed and the first contactor K1 to be disconnected, the primary circuit is in a normal operation condition.
5. The dc grid fault current controller of claim 1, wherein: when the controller controls the IGBT switch to be switched off, the second contactor to be switched on and the first contactor to be switched off, the primary circuit is in an instantaneous fault working condition.
6. The dc grid fault current controller of claim 1, wherein: when the controller controls the IGBT switch to be switched off, the second contactor to be switched off and the first contactor to be switched off, the primary circuit is in a permanent fault working condition.
7. The dc grid fault current controller of claim 1, wherein: when the controller controls the IGBT switch to be switched off, the second contactor to be switched off and the first contactor to be switched on, the primary circuit is in a bypass shutdown working condition.
8. The dc grid fault current controller of claim 1, wherein: the current Hall sensor is arranged beside the second contactor in the series circuit and used for measuring the current flowing through the second contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922194351.1U CN211701471U (en) | 2019-12-10 | 2019-12-10 | Direct current power grid fault current controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922194351.1U CN211701471U (en) | 2019-12-10 | 2019-12-10 | Direct current power grid fault current controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211701471U true CN211701471U (en) | 2020-10-16 |
Family
ID=72790340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922194351.1U Active CN211701471U (en) | 2019-12-10 | 2019-12-10 | Direct current power grid fault current controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211701471U (en) |
-
2019
- 2019-12-10 CN CN201922194351.1U patent/CN211701471U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110994567A (en) | Direct current power grid fault current controller | |
| CN103069530B (en) | The DC load cut-off catalyst of quasiconductor auxiliary | |
| CN103885382B (en) | PLC output circuit with overcurrent protection | |
| CN103560479B (en) | A kind of loaded line failure detector circuit being applied to chopper reclosing and method | |
| CN203056953U (en) | Driver and bus capacitor discharge circuit thereof | |
| CN103219928A (en) | Soft starter of direct-current motor and soft starting method thereof | |
| CN109412117A (en) | A kind of protection circuit against input over-voltage | |
| CN203911743U (en) | Electronic device and capacitor discharge circuit thereof | |
| CN108963986B (en) | Energy supply protection circuit | |
| CN102916387B (en) | A kind of protective circuit exporting shunt for many mouthfuls of POE chargers | |
| CN112091369A (en) | Inverter welding machine protection circuit and electric welding machine | |
| CN102778849B (en) | Switching on and shutting down control circuit, electronic equipment and on-off control method | |
| CN206619906U (en) | A kind of dc circuit breaker | |
| CN211701471U (en) | Direct current power grid fault current controller | |
| CN107666305A (en) | Intelligent switch | |
| CN104577968A (en) | Three-phase overvoltage, under-voltage and default phase integrated protection circuit | |
| CN204597457U (en) | Transformer neutral point direct current is every straight device | |
| CN207399162U (en) | Intelligent switch | |
| CN202351397U (en) | Detection circuit of switching device | |
| CN203423638U (en) | Soft starter for direct current motor | |
| CN207117155U (en) | Standby power-off energy-saving device of large-current starting equipment | |
| CN205880138U (en) | Thyristor latching current automatic checkout device | |
| CN209860580U (en) | Intelligent motor protector | |
| CN204597629U (en) | Based on HMB-5 type breaker control circuit | |
| CN208955640U (en) | A kind of Self-recover overvoltage-undervoltage protector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |