CN114039335A - Auxiliary processing device for bus fault - Google Patents

Auxiliary processing device for bus fault Download PDF

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Publication number
CN114039335A
CN114039335A CN202110533275.1A CN202110533275A CN114039335A CN 114039335 A CN114039335 A CN 114039335A CN 202110533275 A CN202110533275 A CN 202110533275A CN 114039335 A CN114039335 A CN 114039335A
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CN
China
Prior art keywords
fault
bus
current
phase
inlet
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Pending
Application number
CN202110533275.1A
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Chinese (zh)
Inventor
薛占钰
邢进春
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Baoding Yuxin Electrical Technology Co ltd
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Baoding Yuxin Electrical Technology Co ltd
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Baoding Yuxin Electrical Technology Co ltd filed Critical Baoding Yuxin Electrical Technology Co ltd
Priority to CN202110533275.1A priority Critical patent/CN114039335A/en
Publication of CN114039335A publication Critical patent/CN114039335A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • H02H1/0015—Using arc detectors
    • H02H1/0023—Using arc detectors sensing non electrical parameters, e.g. by optical, pneumatic, thermal or sonic sensors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/021—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order
    • H02H3/023—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order by short-circuiting
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/083—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for three-phase systems

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  • Power Conversion In General (AREA)

Abstract

The invention discloses an auxiliary processing device for bus faults, wherein a bus is provided with an incoming switch and a plurality of outgoing lines, each phase line at the lower port of the incoming switch is respectively connected with a thyristor, the other ends of the thyristors are mutually connected in parallel, and when the bus is subjected to interphase short circuit, a fault detection device controls all the thyristors to be conducted or controls the thyristors directly connected with the fault phase line to be conducted so as to divide the current of an interphase short circuit fault point. The device can separate the current of an interphase short circuit fault point before the fault is removed by tripping the incoming line switch, thereby effectively weakening or eliminating a large amount of heat accumulation caused by arc discharge and the like of the fault point and avoiding the occurrence of explosion accidents.

Description

Auxiliary processing device for bus fault
Technical Field
The invention relates to a device, in particular to an auxiliary processing device for bus faults.
Background
In electric power distribution, generally, a 10kV incoming line is led into an incoming screen cabinet and is connected with a bus copper bar in the incoming screen cabinet, an incoming switch is arranged in the incoming screen cabinet, then outgoing lines are led out from the bus copper bar through different outgoing screen cabinets, and an outgoing switch is arranged in the outgoing screen cabinet. If the bus copper bars in the screen cabinet are subjected to interphase short circuit due to an accident, large current discharge and arc light are generated, and accumulated high heat can explode in the screen cabinet to cause great loss. Although an inter-phase short circuit may be detected by the detection device and may cause the service switch to trip, the mechanical tripping of the service switch requires time, during which time an explosion accident may still be caused. At present, no effective treatment method is provided for explosion caused by arc discharge and the like before the incoming line switch is tripped.
Disclosure of Invention
The invention aims to provide an auxiliary processing device for bus faults, which can divide the current of an interphase short-circuit fault point before a service inlet switch trips to remove the fault, thereby effectively weakening or eliminating a large amount of heat accumulation caused by arc discharge and the like of the fault point and avoiding explosion accidents.
In order to achieve the purpose, the invention adopts the following technical scheme:
when the bus is in interphase short circuit, all the thyristors are controlled to be conducted or the thyristors directly connected with the fault phase line are controlled to be conducted to divide the current of an interphase short circuit fault point.
Preferably, the fault detection device detects a bus fault and controls the thyristors to operate, the fault detection device is an arc light detection device or a differential detection device, the arc light detection device judges the occurrence of an interphase short-circuit fault and controls all the thyristors to be conducted by detecting arcs of interphase short-circuit fault points, the differential detection device judges the occurrence of the interphase short-circuit fault and determines a fault phase by means of the non-conservation of the phase current corresponding to each outgoing line and the incoming line current of each phase of the bus, and then the thyristors directly connected with the fault phase line are controlled to be conducted to divide the current of the interphase short-circuit fault points.
Preferably, the fault detection device detects a fault of the bus and controls the thyristor to operate, the fault detection device comprises an inlet current detection unit arranged on an inlet wire of each phase of the bus and an outlet current detection unit arranged on a corresponding phase of the outlet wire, the current amount of the inlet current detection unit is converted into inlet pulses through a voltage-frequency conversion circuit and is transmitted to a comparison unit, the current amount of the outlet current detection unit is converted into outlet pulses through the voltage-frequency conversion circuit and is transmitted to the comparison unit, the comparison unit calculates the difference value between the number of the inlet pulses and the number of the outlet pulses, judges the phase wire as a fault phase when the difference value exceeds a preset value, and simultaneously sends a signal to enable the thyristor directly connected with the phase wire to be conducted.
Preferably, the inlet current detection unit and the outlet current detection unit both include a primary current transformer and a secondary current transformer, weak current signals are obtained from the secondary current transformer and are sent to the voltage-frequency conversion circuit after being raised by the reference voltage raising circuit, the comparison unit includes a counter and an adder/subtractor, the counter calculates the number of pulses, and the adder/subtractor calculates the number of pulses to obtain the difference.
Preferably, the output of the comparison unit is cleared every fixed period.
Preferably, N comparison units are arranged to respectively calculate the difference between the number of the inlet pulses and the number of the outlet pulses in parallel, the output of each comparison unit is cleared every fixed period T, the times of starting clearing of different comparison units are sequentially spaced by T/N, when the calculation result of at least one comparison unit exceeds the threshold, a signal is sent to control the conduction of the thyristor, and N is a positive integer greater than 1.
Preferably, the inlet current detection unit is installed at an upper port of the inlet switch.
Preferably, the period T is set to 3-5 milliseconds, and the N is set to 3-5 milliseconds.
Preferably, the thyristor is installed in the incoming cabinet.
Preferably, each thyristor is connected in parallel after being connected with a resistor in series.
In the invention, when the interphase short-circuit fault occurs in the bus, the thyristor connected in parallel with the bus is immediately conducted, a loop connected in parallel with the fault point is formed through the thyristor and is conducted to generate current, so that the current of the interphase short-circuit fault point can be branched, the heat release of the fault point is effectively reduced, and the explosion is avoided. If the fault detection device is capable of specifically detecting a faulty phase, the thyristors directly connected to the faulty phase can be controlled to conduct so that the fault point current can be divided more efficiently. The voltage-frequency conversion circuit is adopted to convert the current magnitude into pulses and calculate the difference value of the pulse number, so that the interphase short-circuit fault can be detected more quickly, the fault phase can be distinguished, and the judgment can be made quickly. According to the invention, by utilizing the characteristics of quick response of the thyristor ringing and differential method, the current of a fault point can be effectively divided before the incoming line switch trips, so that the occurrence of explosion accidents caused by short circuit is effectively avoided.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in figure 1, the auxiliary processing device for the bus fault is installed on a bus 1, an incoming line switch 2 and a plurality of outgoing lines 3 are arranged on the bus 1, three phase lines at the lower port of the incoming line switch 2 are respectively connected with a thyristor 4, the other ends of three thyristors 4 are connected in parallel, when an interphase short circuit occurs on the bus 1, the other ends of the three thyristors 4 can be detected by a fault detection device, the fault detection device controls all the thyristors 4 to be conducted, so that a loop connected with a fault point in parallel is formed, the current of the fault point is divided, and the heat release of the fault point is reduced. Or more preferably, the fault detection device can detect the fault phase, and then the thyristor 4 directly connected with the fault phase line is controlled to be conducted to shunt the current of the inter-phase short-circuit fault point, and at the moment, the thyristor of the non-fault phase is not conducted, so that the manufactured parallel loop is more targeted, and the shunting effect is better.
In one embodiment, the fault detection device is an arc detection device, and the arc detection device performs detection through an arc, and cannot distinguish a fault phase from a non-fault phase, so that the thyristors 4 are controlled to be fully conducted after the arc is detected. In another embodiment, the fault detection device is 3 sets of single-phase differential devices, the differential detection device judges the occurrence of the inter-phase short-circuit fault and can determine the fault phase by means of the non-conservation of the incoming current and the outgoing current of the bus 1, and then the thyristor 4 directly connected with the fault phase line is controlled to be conducted to shunt the current of the inter-phase short-circuit fault point, and the shunting effect is more obvious at the moment. Preferably, each thyristor 4 is connected in parallel after being connected in series with a resistor.
In a preferred embodiment, the fault detection device comprises an inlet current detection unit 5 and an outlet current detection unit 6, wherein the inlet current detection unit 5 and the outlet current detection unit 6 are arranged at the inlet wire end of an inlet bus 1 on an inlet switch 2, the current quantity of the inlet current detection unit 5 is converted into inlet pulses through a voltage-frequency conversion circuit (VFC) and is transmitted to a comparison unit 7, the current quantity of the outlet current detection unit 6 is converted into outlet pulses through the voltage-frequency conversion circuit (VFC) and is transmitted to the comparison unit 7, the comparison unit 7 calculates the difference value between the inlet pulse number and the outlet pulse number, judges the phase wire as a fault phase after the difference value exceeds a preset value, and simultaneously sends a signal to switch on a thyristor directly connected with the phase wire and sends a signal to trip the inlet switch 2.
The inlet current detection unit 5 and the outlet current detection unit 6 both comprise a primary current transformer and a secondary current transformer, and weak current signals are obtained from the secondary current transformer and are sent to the voltage-frequency conversion circuit after being lifted by the reference voltage lifting circuit.
The comparison unit comprises a counter and an adder/subtracter, wherein the counter calculates the pulse number, and the adder/subtracter calculates the pulse number to obtain the difference value.
And resetting the output of the comparison unit every fixed period to avoid the accumulation of errors from exceeding a preset value. In one embodiment, 5 comparison units are arranged to calculate the difference value between the number of the inlet pulses and the number of the outlet pulses respectively in parallel, the output of each comparison unit is cleared every fixed period T (for example, 5 milliseconds), and the zero clearing time of different comparison units is sequentially separated by T/N =1 millisecond (N is the number of comparison units, where N = 5), so that a bus fault can be 1 millisecond outlet, when the calculation result of at least one comparison unit exceeds a threshold value, a signal is sent to control the conduction of a thyristor, N is a positive integer greater than 1, and preferably 3, 4, or 5. For further details of the implementation, see utility model CN 211183401U.
The above embodiments are only a few illustrations of the inventive concept and implementation, not limitations thereof, and the technical solutions without substantial changes are still within the scope of protection under the inventive concept.

Claims (10)

1. The bus fault auxiliary processing device is characterized in that each phase line at the lower port of the incoming line switch is respectively connected with a thyristor, the other ends of the thyristors are mutually connected in parallel, and when the bus is subjected to interphase short circuit, all the thyristors are controlled to be conducted or the thyristors directly connected with the fault phase line are controlled to be conducted so as to distribute the current of an interphase short circuit fault point.
2. The bus fault auxiliary processing device according to claim 1, wherein a fault detection device detects a bus fault and controls the thyristor to operate, the fault detection device is an arc detection device or a differential detection device, the arc detection device judges the occurrence of an inter-phase short-circuit fault by detecting an arc of an inter-phase short-circuit fault point and controls all thyristors to be turned on, the differential detection device judges the occurrence of the inter-phase short-circuit fault by non-conservation of current of each phase incoming line of the bus and corresponding phase current of each outgoing line and determines a fault phase, and then controls the thyristor directly connected to the fault phase line to be turned on to divide the current of the inter-phase short-circuit fault point.
3. The bus fault auxiliary processing device according to claim 1, wherein a fault detection device is used to detect a bus fault and control the thyristor to operate, the fault detection device comprises an inlet current detection unit arranged on an inlet line of each phase of the bus and an outlet current detection unit arranged on a corresponding phase of the outlet line, the current amount of the inlet current detection unit is converted into inlet pulses by a voltage-frequency conversion circuit and is transmitted to a comparison unit, the current amount of the outlet current detection unit is converted into outlet pulses by the voltage-frequency conversion circuit and is transmitted to the comparison unit, the comparison unit calculates the difference between the inlet pulse number and the outlet pulse number, determines that the phase line is a fault phase when the difference exceeds a preset value, and simultaneously sends a signal to turn on the thyristor directly connected with the phase line.
4. An auxiliary processing device for bus fault as claimed in claim 3, wherein said inlet current detecting unit and said outlet current detecting unit each comprise a primary current transformer and a secondary current transformer, weak current signals are obtained from said secondary current transformer and sent to said voltage-to-frequency converting circuit after being raised by a reference voltage raising circuit, said comparing unit comprises a counter and an adder/subtracter, the counter calculates the number of pulses, and the adder/subtracter calculates said number of pulses to obtain said difference.
5. An auxiliary processing device for bus fault as claimed in claim 4, characterized in that the output of said comparison unit is cleared every fixed period.
6. An auxiliary processing device for bus faults as claimed in claim 5, wherein N comparison units are arranged to calculate the difference value of the number of the inlet pulses and the number of the outlet pulses respectively in parallel, the output of each comparison unit is cleared every fixed period T, the times of starting clearing of different comparison units are sequentially separated by T/N, when the calculation result of at least one comparison unit exceeds the threshold value, a signal is sent to control the conduction of the thyristor, and N is a positive integer greater than 1.
7. The bus bar fault auxiliary handling device of claim 3, wherein said inlet current detection unit is installed at an upper port of said service switch.
8. An auxiliary bus fault handling device as claimed in claim 6, wherein said period T is set to 3-5 milliseconds and said N is set to 3-5 milliseconds.
9. An auxiliary bus bar fault handling device as recited in claim 1, wherein said thyristors are mounted within an inlet cabinet.
10. An auxiliary bus fault handling device as claimed in claim 1, wherein each thyristor is connected in series with a resistor and then connected in parallel.
CN202110533275.1A 2021-05-17 2021-05-17 Auxiliary processing device for bus fault Pending CN114039335A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110533275.1A CN114039335A (en) 2021-05-17 2021-05-17 Auxiliary processing device for bus fault

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110533275.1A CN114039335A (en) 2021-05-17 2021-05-17 Auxiliary processing device for bus fault

Publications (1)

Publication Number Publication Date
CN114039335A true CN114039335A (en) 2022-02-11

Family

ID=80139734

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110533275.1A Pending CN114039335A (en) 2021-05-17 2021-05-17 Auxiliary processing device for bus fault

Country Status (1)

Country Link
CN (1) CN114039335A (en)

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