CN103063978A - Detection method and device for short circuit - Google Patents
Detection method and device for short circuit Download PDFInfo
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Abstract
The invention discloses a detection method and a device for a short circuit and belongs to the technical field of electric circuit fault detection. The method comprises: detecting a first output current of a semiconductor control rectifier (SCR) of two adjacent a two-phase bypass in three-phase bypass detecting a second output current of the SCR of the other two-phase bypass of the three-phase bypass; judging whether the first output current exceeds a presupposed current threshold value or not, and judging whether the second output current exceeds a presupposed current threshold value; confirming whether a short circuit exists in the three-phase bypass or not according to detecting results. Due to the fact that if the short circuit exists in the bypass, a current which flows past the SCR of the two-phase bypass is different from the current which flows past the SCR of the two-phase bypass on a normal circumstance, the current which flows past the SCR of two arbitrary adjacent phase bypasses in the three-phase bypass is detected through an electric current transducer in the detection method and the device for the short circuit. Even if all three-phase bypass short out, the short-circuit fault can be detected. Compared with the prior art, the detection method and the device for the short circuit overcomes the problem that the short-circuit fault can not be detected if all the three-phase bypass short out and reduces fault of false alarm and missing alarm.
Description
Technical field
The present invention relates to short circuit detection technique field, particularly a kind of method for detecting short circuit and device.
Background technology
UPS(Uninterruptible Power System; when uninterruptible power system) initially powering on or in the course of normal operation; as bypass SCR(Silicon Controlled Rectifier; when silicon controlled rectifier) being short-circuited fault; can cause bypass input and inverter output voltage direct short-circuit; this just requires that UPS can identify for bypass SCR short circuit, alarm and protection, otherwise, can cause the fault of converter of UPS to damage.
Prior art is to adopt a CT(Current Transformer, current sensor) output current value of three-phase bypass detected, and compare with the output current value of normal bypass, if a certain bypass SCR short circuit occurs mutually, the current value that CT detects can surpass normal value, then testing circuit can send low level, otherwise testing circuit can send high level.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
When the whole short circuit of three-phase bypass, the current value that CT detects is 0, substantially equates with the current value of normal circuit three-phase output, and testing circuit can't detect the situation of the whole short circuits of three-phase bypass, and UPS easily breaks down and reports by mistake or fail to report.
Summary of the invention
In order to solve the problem of prior art, the embodiment of the invention provides a kind of method for detecting short circuit and device.Described technical scheme is as follows:
On the one hand, provide a kind of method for detecting short circuit, described method comprises:
Detect the first output current of the silicon controlled rectifier SCR of adjacent two-phase bypass in the three-phase bypass, and detect the second output current of the SCR of other adjacent two-phase bypass in the described three-phase bypass;
Judge whether described the first output current surpasses default current threshold, and judge whether described the second output current surpasses default current threshold;
Determine according to judged result whether described three-phase bypass exists short circuit.
In conjunction with first aspect, in the possible implementation of the first, the first output current of the silicon controlled rectifier SCR of adjacent two-phase bypass in the bypass of described detection three-phase comprises:
Power on the first output current of the SCR of adjacent two-phase bypass in the front described three-phase bypass of detection;
The second output current of the SCR of other adjacent two-phase bypass in the described three-phase bypass of described detection comprises:
Power on the second output current of the SCR of other adjacent two-phase bypass in the front described three-phase bypass of detection.
In conjunction with first aspect, in the possible implementation of the second, the first output current of the silicon controlled rectifier SCR of adjacent two-phase bypass in the bypass of described detection three-phase comprises:
Detect the first output current of the SCR of adjacent two-phase bypass in the three-phase bypass in service;
The second output current of the SCR of other adjacent two-phase bypass in the described three-phase bypass of described detection comprises:
Detect the second output current of the SCR of other adjacent two-phase bypass in the described three-phase bypass in service.
In conjunction with first aspect, in the third possible implementation, the first output current of the silicon controlled rectifier SCR of adjacent two-phase bypass in the bypass of described detection three-phase comprises:
Adopt the first current sensor to be through and detect the first output current between the SCR back of adjacent two-phase bypass in the described three-phase bypass and the capacitive load;
The output current of the SCR of other adjacent two-phase bypass in the described three-phase bypass of described detection comprises:
Adopt the second current sensor to be through and detect the second output current between the SCR back of other adjacent two-phase bypass in the described three-phase bypass and the capacitive load.
In conjunction with first aspect, in the 4th kind of possible implementation, describedly judge that whether described the first output current surpasses default current threshold, and judge that whether described the second output current surpasses before the default current threshold, also comprises:
Described the first output current is carried out amplitude limit, amplification, filtering, rectification be treated to the first digital voltage signal, described the second output current is carried out amplitude limit, amplification, filtering, rectification be treated to the second digital voltage signal, and described default current threshold is carried out amplitude limit, amplification, filtering, rectification be treated to the voltage compare threshold;
More described the first digital voltage signal and described voltage compare threshold obtain the first comparative result, and more described the second digital voltage signal and described voltage compare threshold, obtain the second comparative result;
Describedly judge that whether described the first output current surpasses default current threshold, and judge that whether described the second output current surpasses default current threshold, comprising:
Judge according to described the first comparative result whether described the first output current surpasses default current threshold, and judge according to described the second comparative result whether described the second output current surpasses default current threshold.
In conjunction with the 4th kind of possible implementation of first aspect or first aspect, in the 5th kind of possible implementation, describedly determine that according to judged result whether described three-phase bypass exists short circuit, comprising:
If described the first output current surpasses default current threshold, and/or described the second output current surpasses default current threshold, determines that then there is short circuit in described three-phase bypass.
Second aspect provides a kind of short-circuit detecting device, and described device comprises:
First detection module is for detection of the first output current of the silicon controlled rectifier SCR of adjacent two-phase bypass in the three-phase bypass;
The second detection module is for detection of the second output current of the SCR of other adjacent two-phase bypass in the described three-phase bypass;
Judge module is used for judging whether described the first output current surpasses default current threshold, and judges whether described the second output current surpasses default current threshold;
Determination module is used for determining according to the judged result of described judge module whether described three-phase bypass exists short circuit.
In conjunction with second aspect, in the possible implementation of the first, described first detection module is for detection of the first output current of the SCR of adjacent two-phase bypass in the front described three-phase bypass that powers on;
Described the second detection module is for detection of the second output current of the SCR of other adjacent two-phase bypass in the front described three-phase bypass that powers on.
In conjunction with second aspect, in the possible implementation of the second, described first detection module is for detection of the first output current of the SCR of adjacent two-phase bypass in the described three-phase bypass in service;
Described the second detection module is for detection of the second output current of the SCR of other adjacent two-phase bypass in the described three-phase bypass in service.
In conjunction with second aspect, in the third possible implementation, described first detection module be used for to adopt the first current sensor to be through between the SCR back of the adjacent two-phase bypass of described three-phase bypass and the capacitive load and detects the first output current;
Described the second detection module be used for to adopt the second current sensor to be through between the SCR back of the other adjacent two-phase bypass of described three-phase bypass and the capacitive load and detects the second output current.
In conjunction with second aspect, in the 4th kind of possible implementation, described device also comprises:
Processing module, be used for that described the first output current is carried out amplitude limit, amplification, filtering, rectification and be treated to the first digital voltage signal, described the second output current is carried out amplitude limit, amplification, filtering, rectification be treated to the second digital voltage signal, and described default current threshold is carried out amplitude limit, amplification, filtering, rectification be treated to the voltage compare threshold;
Comparison module, be used for more described processing module and process the first digital voltage signal and the described voltage compare threshold that obtains, obtain the first comparative result, and more described processing module processes the second digital voltage signal and the described voltage compare threshold obtain, obtain the second comparative result;
Described judge module, be used for judging according to the first comparative result that described comparison module obtains whether described the first output current surpasses default current threshold, and judge according to the second comparative result that described comparison module obtains whether described the second output current surpasses default current threshold.
The 4th kind of possible implementation in conjunction with second aspect or second aspect, in the 5th kind of possible implementation, described determination module, judge that described the first output current surpasses default current threshold if be used for described judge module, and/or, described judge module judges that described the second output current surpasses default current threshold, determines that then there is short circuit in described three-phase bypass.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is:
Because if bypass is short-circuited, the electric current that flows through two-phase bypass SCR is different from the electric current that flows through under normal circumstances two-phase bypass SCR, therefore by adopting current sensor to detect the output current that flows through the SCR of arbitrary neighborhood two-phase bypass in the three-phase bypass, even three-phase all is short-circuited, also can detect short trouble, overcome the problem that prior art can not detect the whole short troubles of three-phase, reduced fault and fail to report or report by mistake.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is a kind of method for detecting short circuit process flow diagram that the embodiment of the invention one provides;
Fig. 2 is a kind of short-circuit detecting circuit structural representation that the embodiment of the invention two provides;
Fig. 3 is a kind of method for detecting short circuit process flow diagram that the embodiment of the invention two provides;
Fig. 4 is the structural representation of the another kind of short-circuit detecting circuit that provides of the embodiment of the invention two;
Fig. 5 is the structural representation of another short-circuit detecting circuit of providing of the embodiment of the invention two;
Fig. 6 is the structural representation of a kind of short-circuit detecting device of providing of the embodiment of the invention three;
Fig. 7 is the structural representation of the another kind of short-circuit detecting device that provides of the embodiment of the invention three.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Embodiment one
The embodiment of the invention provides a kind of method for detecting short circuit, and referring to Fig. 1, method flow comprises:
101: detect the first output current of the SCR of adjacent two-phase bypass in the three-phase bypass, and detect the second output current of the SCR of other adjacent two-phase bypass in the three-phase bypass;
Particularly, detect the first output current of the SCR of adjacent two-phase bypass in the three-phase bypass, include but not limited to:
Power on the first output current of the SCR of adjacent two-phase bypass in the three-phase bypass of detection;
Detect the second output current of the SCR of other adjacent two-phase bypass in the three-phase bypass, include but not limited to:
Power on the second output current of the SCR of other adjacent two-phase bypass in the three-phase bypass of detection.
Alternatively, detect the first output current of the SCR of adjacent two-phase bypass in the three-phase bypass, include but not limited to:
Detect the first output current of the SCR of adjacent two-phase bypass in the three-phase bypass in service;
Detect the second output current of the SCR of other adjacent two-phase bypass in the three-phase bypass, include but not limited to:
Detect the second output current of the SCR of other adjacent two-phase bypass in the three-phase bypass in service.
Further, detect the first output current of the SCR of adjacent two-phase bypass in the three-phase bypass, include but not limited to:
Adopt the first current sensor to be through and detect the first output current between the SCR back of adjacent two-phase bypass in the three-phase bypass and the capacitive load;
Detect the output current of the SCR of other adjacent two-phase bypass in the three-phase bypass, include but not limited to:
Adopt the second current sensor to be through and detect the second output current between the SCR back of other adjacent two-phase bypass in the three-phase bypass and the capacitive load.
102: judge whether the first output current surpasses default current threshold, and judge whether the second output current surpasses default current threshold;
Particularly, judge whether the first output current surpasses default current threshold, and judge that whether the second output current surpasses before the default current threshold, also comprises:
The first output current is carried out amplitude limit, amplification, filtering, rectification be treated to the first digital voltage signal, the second output current is carried out amplitude limit, amplification, filtering, rectification be treated to the second digital voltage signal, and default current threshold is carried out amplitude limit, amplification, filtering, rectification be treated to the voltage compare threshold;
Relatively the first digital voltage signal and voltage compare threshold obtain the first comparative result, and compare the second digital voltage signal and voltage compare threshold, obtain the second comparative result;
Correspondingly, judge whether the first output current surpasses default current threshold, and judge that whether the second output current surpasses default current threshold, includes but not limited to:
Judge according to the first comparative result whether the first output current surpasses default current threshold, and judge according to the second comparative result whether the second output current surpasses default current threshold.
103: determine according to judged result whether the three-phase bypass exists short circuit.
Particularly, determine that according to judged result whether the three-phase bypass exists short circuit, includes but not limited to:
If the first output current surpasses default current threshold, and/or the second output current surpasses default current threshold, determines that then there is short circuit in the three-phase bypass.
The method that the embodiment of the invention provides, because if bypass is short-circuited, the electric current that flows through two-phase bypass SCR is different from the electric current that flows through under normal circumstances two-phase bypass SCR, therefore by adopting current sensor to detect the output current that flows through the SCR of arbitrary neighborhood two-phase bypass in the three-phase bypass, even three-phase all is short-circuited, also can detect short trouble, overcome the problem that prior art can not detect the whole short troubles of three-phase, reduce fault and fail to report or report by mistake.
Embodiment two
The embodiment of the invention provides a kind of method for detecting short circuit, and in conjunction with the content of above-described embodiment one, for convenience of explanation, the present embodiment is take the structure of short-circuit detecting circuit shown in Figure 2 as example, and the short-circuit detecting mode that the present embodiment is provided describes.Among Fig. 2, this short-circuit detecting circuit comprises A, B, the bypass of C three-phase, and every phase bypass comprises silicon controlled rectifier SCR, and SCR_A, SCR_B, SCR_C are the static switch in the bypass; R1/C7, R2/C8, R3/C9 are respectively the resistance-capacitance absorption device of SCR; C1, C2, C3 are capacitive load, C4, C5, C6 are capacitive load, CT1, CT2 are current sensor, CT1 is through between SCR_A, SCR_B back and C4, C5, the C6 capacitive load of A in the three-phase bypass, the bypass of B two-phase and detects output current, and CT2 is through between SCR_B, SCR_C back and C4, C5, the C6 capacitive load of B in the three-phase bypass, the bypass of C two-phase and detects output current; UA_out, UB_out, UC_out are the ups system three-phase output voltage, and N is the ups system zero line.Referring to Fig. 3, the method flow that the present embodiment provides comprises:
201: adopt the first current sensor to detect the first output current of SCR_A, the SCR_B of adjacent two-phase bypass A, B in the three-phase bypass that powers on.
Particularly, when not powering on, adopt ups system current sensor that adjacent A, the SCR_A of B two-phase bypass, the output current of SCR_B in the three-phase bypass are detected, as shown in Figure 2, specifically adopt current sensor CT1 to be through between SCR_A, SCR_B back and C4, C5, the C6 capacitive load of adjacent A in the three-phase bypass, the bypass of B two-phase and detect output current; If have one to be short-circuited mutually in A, the B two-phase, for example A is short-circuited mutually, and the A phase SCR_A of short circuit just has electric current and flows through, and perhaps, B is short-circuited mutually, and the B phase SCR_B of short circuit also has electric current and flows through, and the concrete account form of the first output current is as follows:
When SCR_A or SCR_B normal turn-off, the first output current that current sensor CT1 detects SCR_A or SCR_B is:
I=2πf*C*U=2*3.14*50*0.022*311/1000000=2.15mA。
Wherein, f is electric voltage frequency, f=50Hz; U is voltage peak, and U=311V, C are C7 among Fig. 2 or the capacitance of C8, and the equal and opposite in direction of the capacitance of C7, C8, and in the practical application, the value of this C can be 0.022 μ F.
When SCR_A or SCR_B short circuit, the first output current that current sensor CT1 detects SCR_A or SCR_B is:
I=2πf*C*U=2*3.14*50*0.47*311/1000000=46mA。
Wherein, f is electric voltage frequency, f=50Hz; U is voltage peak, and U=311V, C are the electric capacity in C4, C5, the C6 capacitive load, and value is 0.47 μ F, and this capacitance can also be adjusted according to the current threshold of setting, and the size of this capacitance will be much larger than 0.022 μ F.
If A, the simultaneously short circuit of B two-phase, also have electric current current flowing sensor CT1, and owing to having phase differential between A, the B two-phase, so want large many by the electric current of current sensor CT1 under the current ratio static switch SCR_A by current sensor CT1, the normal closed condition of SCR_B, specifically be calculated as follows:
When SCR_A and SCR_B normal turn-off, the first output current that current sensor CT1 detects SCR_A and SCR_B is:
Wherein, f is electric voltage frequency, f=50Hz; U is voltage peak, and U=311V, C are C7 among Fig. 2 or the capacitance of C8, and the equal and opposite in direction of the capacitance of C7, C8, and in the practical application, the value of this C can be 0.022 μ F.
When SCR_A and SCR_B short circuit, the first output current that current sensor CT1 detects SCR_A and SCR_B is:
Wherein, f is electric voltage frequency, f=50Hz; U is voltage peak, and U=311V, C are the electric capacity in C4, C5, the C6 capacitive load, and value is 0.47 μ F, and this capacitance can also be adjusted according to the current threshold of setting, and the size of this capacitance will be much larger than 0.022 μ F.
Except adopting the first current sensor to detect adjacent two-phase bypass A in the three-phase bypass that powers on, the SCR_A of B, the first output current of SCR_B, can also be in the ups system operational process, detect adjacent A in the three-phase bypass, the SCR_A of B two-phase bypass, the first output current of SCR_B, A in the three-phase bypass, in the B two-phase one is short-circuited mutually or two-phase all is short-circuited, adopt first sensor to detect adjacent A in the three-phase bypass in service, the SCR_A of B two-phase bypass, the first output current of SCR_B, calculate the process of electric current with the step of above-mentioned calculating electric current, repeat no more herein.
202: adopt the second current sensor to detect the second output current of SCR_B, the SCR_C of other two adjacent bypass B, C in the three-phase bypass that powers on.
Particularly, adopt current sensor that the second output current of SCR_B, the SCR_C of adjacent B, the bypass of C two-phase in the three-phase bypass is not detected when ups system powers on, specifically adopt current sensor CT2 to be through detection the second output current between SCR_B, SCR_C back and C4, C5, the C6 capacitive load of adjacent B in the three-phase bypass, the bypass of C two-phase; If have one to be short-circuited mutually in B, the C two-phase, for example B is short-circuited mutually, and the B phase SCR_B of short circuit just has electric current current flowing sensor CT2, and C is short-circuited mutually, the C phase SCR_C of short circuit also has electric current current flowing sensor CT2, specifically being calculated as follows of the second output current:
When SCR_B or SCR_C normal turn-off, the second output current that current sensor CT1 detects SCR_B or SCR_C is:
I=2πf*C*U=2*3.14*50*0.022*311/1000000=2.15mA。
Wherein, f is electric voltage frequency, f=50Hz; U is voltage peak, and U=311V, C are C8 among Fig. 2 or the capacitance of C9, and the equal and opposite in direction of the capacitance of C8, C9, and in the practical application, the value of this C can be 0.022 μ F.
When SCR_B or SCR_C short circuit, the first output current that current sensor CT1 detects SCR_B or SCR_C is:
I=2πf*C*U=2*3.14*50*0.47*311/1000000=46mA。
Wherein, f is electric voltage frequency, f=50Hz; U is voltage peak, and U=311V, C are the electric capacity in C4, C5, the C6 capacitive load, and value is 0.47 μ F, and this capacitance can also be adjusted according to the current threshold of setting, and the size of this capacitance will be much larger than 0.022 μ F.
If B, the simultaneously short circuit of C two-phase, also have electric current current flowing sensor CT2, and owing to having phase differential between B, the C two-phase, so want large many by the electric current of current sensor CT2 under the current ratio static switch SCR_B by current sensor CT2, the normal closed condition of SCR_C, specifically be calculated as follows:
When SCR_B and SCR_C normal turn-off, current sensor CT2 detects the second output current of SCR_B and SCR_C:
Wherein,, f is electric voltage frequency, f=50Hz; U is voltage peak, and U=311V, C are C8 among Fig. 2 or the capacitance of C9, and the equal and opposite in direction of the capacitance of C8, C9, and in the practical application, the value of this C can be 0.022 μ F.
When two-phase SCR_B and SCR_C short circuit, current sensor CT2 detects the second output current of SCR_B and SCR_C:
Wherein, f is electric voltage frequency, f=50Hz; U is voltage peak, and U=311V, C are the electric capacity in C4, C5, the C6 capacitive load, and value is 0.47 μ F, and this capacitance can also be adjusted according to the current threshold of setting, and the size of this capacitance will be much larger than 0.022 μ F.
Perhaps, can also be in the ups system operational process, B, the SCR_B of C two-phase bypass and the second output current of SCR_C in the bypass of detection three-phase, in B in the three-phase bypass, the C two-phase one is short-circuited mutually or two-phase all is short-circuited, adopt the second sensor to detect the second output current of SCR_B, the SCR_C of adjacent B in the three-phase bypass in service, the bypass of C two-phase, calculate the process of electric current with the step of above-mentioned calculating electric current.
203: the first output current is carried out amplitude limit, amplification, filtering, rectification be treated to the first digital voltage signal, default current threshold is carried out amplitude limit, amplification, filtering, rectification be treated to the voltage compare threshold, the second output current is carried out amplitude limit, amplification, filtering, rectification be treated to the second digital voltage signal;
Particularly, the embodiment of the invention all is converted to digital voltage signal with the first output current with default current threshold and compares, and the first output current value and the second output current value that the current threshold of wherein presetting calculates according to step 201, step 202 are preset as 45mA.Adopt a treatment circuit to change output current into digital voltage signal in the embodiment of the invention, referring to Fig. 4, default current threshold changes the voltage compare threshold into through after the processing circuit processes, this compare threshold is that 1V(also can be made as other values), the particular circuit configurations for the treatment of circuit as shown in Figure 5, the first output current that detects take current sensor CT1 is as example, the first output current that CT1 will detect carries out shaping by amplitude limiter circuit, then input amplifying circuit amplifies, pass through afterwards filtering and half-wave rectification, be treated to the first digital voltage signal, through voltage comparator circuit the first digital voltage signal and predeterminated voltage compare threshold compared; The second output current that CT2 will detect carries out shaping by amplitude limiter circuit, then input amplifying circuit amplifies, pass through afterwards filtering and half-wave rectification, be treated to the second digital voltage signal, through voltage comparator circuit the second digital voltage signal and predeterminated voltage compare threshold are compared.
204: compare the first digital voltage signal and voltage compare threshold, obtain the first comparative result, and compare the second digital voltage signal and voltage compare threshold, obtain the second comparative result;
Referring to Fig. 4 and Fig. 5, by voltage comparator circuit the first digital voltage signal and voltage compare threshold are compared; Obtain the first comparative result; And by voltage comparator circuit the second digital voltage signal and voltage compare threshold are compared, obtain the second comparative result.
205: judge according to the first comparative result whether the first output current surpasses default current threshold, and judge according to the second comparative result whether the second output current surpasses default current threshold;
If being the first digital voltage signal value, the first comparative result surpasses the voltage compare threshold, judge that then the first output current surpasses default current threshold, if the first digital voltage signal value does not surpass the voltage compare threshold, judge that then the first output current does not have to surpass default current threshold; If being the second digital voltage signal, the second comparative result surpasses the voltage compare threshold, judge that then the second output current surpasses default current threshold, if the second digital voltage signal does not surpass the voltage compare threshold, judge that then the second output current does not have to surpass default current threshold.
206: determine according to judged result whether the three-phase bypass exists short circuit.
If the first output current surpasses default current threshold, and/or the second output current surpasses default current threshold, determines that then there is short circuit in the three-phase bypass, and then the processor output low level, can not survey by mistake, and perhaps inspection does not measure; If the first output current does not have to surpass default current threshold, the second output current does not exceed default current threshold yet simultaneously, and then processor output high level represents that the three-phase bypass is without short circuit.
The method that the embodiment of the invention provides, because if bypass is short-circuited, the electric current that flows through two-phase bypass SCR is different from the electric current that flows through under normal circumstances two-phase bypass SCR, therefore by adopting current sensor to detect the output current that flows through the SCR of arbitrary neighborhood two-phase bypass in the three-phase bypass, even three-phase all is short-circuited, also can detect short trouble, overcome the problem that prior art can not detect the whole short troubles of three-phase, reduce fault and fail to report or report by mistake.
Embodiment three
The embodiment of the invention provides a kind of short-circuit detecting device, and this device be used for to be carried out the method for detecting short circuit that above-described embodiment one or embodiment two provide.Referring to Fig. 6, this device comprises:
The second detection module 602 is for detection of the second output current of the SCR of other adjacent two-phase bypass in the three-phase bypass;
Wherein first detection module 601, for detection of the first output current of the SCR of adjacent two-phase bypass in the three-phase bypass that powers on;
The second detection module 602 is for detection of the second output current of the SCR of other adjacent two-phase bypass in the three-phase bypass that powers on.
Alternatively, first detection module 601 is for detection of the first output current of the SCR of adjacent two-phase bypass in the three-phase bypass in service;
The second detection module 602 is for detection of the second output current of the SCR of other adjacent two-phase bypass in the three-phase bypass in service.
Further, first detection module 601 specifically adopts the first current sensor to be through and detects the first output current between the SCR back of adjacent two-phase bypass in the three-phase bypass and the capacitive load;
The second detection module 602 specifically adopts the second current sensor to be through and detects the second output current between the SCR back of other adjacent two-phase bypass in the three-phase bypass and the capacitive load.
Further, referring to Fig. 7, this device also comprises:
Further, determination module 604 judges that the first output current surpasses default current threshold if be used for judge module 603, and/or judge module 603 judges that the second output current surpasses default current threshold, determines that then there is short circuit in the three-phase bypass.
The device that the embodiment of the invention provides, because if bypass is short-circuited, the electric current that flows through two-phase bypass SCR is different from the electric current that flows through under normal circumstances two-phase bypass SCR, therefore by adopting current sensor to detect the output current that flows through the SCR of arbitrary neighborhood two-phase bypass in the three-phase bypass, even three-phase all is short-circuited, also can detect short trouble, overcome the problem that prior art can not detect the whole short troubles of three-phase, reduce fault and fail to report or report by mistake.
Embodiment four
The embodiment of the invention provides a kind of short circuit detector, this short circuit detector comprises processor, this processor is for detection of the first output current of the SCR of adjacent two-phase bypass in the three-phase bypass, and detects the second output current of the SCR of other adjacent two-phase bypass in the three-phase bypass; Judge whether the first output current surpasses default current threshold, and judge whether the second output current surpasses default current threshold; Determine according to judged result whether the three-phase bypass exists short circuit.
Further, when this processor detects the first output current of the SCR of adjacent two-phase bypass in the three-phase bypass, for detection of the first output current of the SCR of adjacent two-phase bypass in the three-phase bypass that powers on; When this processor detects the second output current of the SCR of other adjacent two-phase bypass in the three-phase bypass, for detection of the second output current of the SCR of other adjacent two-phase bypass in the three-phase bypass that powers on.
Further, when this processor detects the first output current of the SCR of adjacent two-phase bypass in the three-phase bypass, for detection of the first output current of the SCR of adjacent two-phase bypass in the three-phase bypass in service; When this processor detects the second output current of the SCR of other adjacent two-phase bypass in the three-phase bypass, for detection of the second output current of the SCR of other adjacent two-phase bypass in the three-phase bypass in service.
Further, when this processor detects the first output current of the SCR of adjacent two-phase bypass in three-phase bypass, detect the first output current between the SCR back that is used for adopting the first current sensor to be through the adjacent two-phase bypass of three-phase bypass and the capacitive load; When this processor detects the second output current of the SCR of other adjacent two-phase bypass in three-phase bypass, detect the second output current between the SCR back that is used for adopting the second current sensor to be through the other adjacent two-phase bypass of three-phase bypass and the capacitive load.
Further, this short circuit detector also comprises amplitude limiter circuit, amplifying circuit, filtering circuit, half-wave rectifying circuit and voltage comparator circuit, and amplitude limiter circuit is used for the first output current, the second output current and default current threshold are carried out amplitude limit; Amplifying circuit is used for the first output current, the second output current and default current threshold that amplitude limiter circuit is carried out behind the amplitude limit are amplified; Filtering circuit carries out filtering for the first output current after amplifying circuit is amplified, the second output current and default current threshold; Half-wave rectifying circuit is used for that filtering circuit is carried out filtered the first output current, the second output current and default current threshold and carries out the rectification processing, obtains respectively the first digital voltage signal, the second digital voltage signal and voltage compare threshold;
Voltage comparator circuit is used for relatively the first digital voltage signal and voltage compare threshold, obtains the first comparative result, and compares the second digital voltage signal and voltage compare threshold, obtains the second comparative result;
Processor is used for judging according to the first comparative result that voltage comparator circuit obtains whether the first output current surpasses default current threshold; And judge that according to the second comparative result that voltage comparator circuit obtains whether the second output current surpasses default current threshold.
Further, this processor surpasses default current threshold if be used for the first output current when determining according to judged result whether the three-phase bypass exists short circuit, and/or the second output current surpasses default current threshold, determines that then there is short circuit in the three-phase bypass.
In sum, the equipment that the embodiment of the invention provides, because if bypass is short-circuited, the electric current that flows through two-phase bypass SCR is different from the electric current that flows through under normal circumstances two-phase bypass SCR, therefore by adopting current sensor to detect the output current that flows through the SCR of arbitrary neighborhood two-phase bypass in the three-phase bypass, even three-phase all is short-circuited, also can detect short trouble, overcome the problem that prior art can not detect the whole short troubles of three-phase, reduced fault and fail to report or report by mistake.
Need to prove: the short-circuit detecting device that above-described embodiment provides is when carrying out short-circuit detecting, only the division with above-mentioned each functional module is illustrated, in the practical application, can as required the above-mentioned functions distribution be finished by different functional modules, the inner structure that is about to device is divided into different functional modules, to finish all or part of function described above.In addition, the short-circuit detecting device that above-described embodiment provides, equipment and method for detecting short circuit embodiment belong to same design, and its specific implementation process sees embodiment of the method for details, repeats no more here.
The invention described above embodiment sequence number does not represent the quality of embodiment just to description.
The all or part of step that one of ordinary skill in the art will appreciate that realization above-described embodiment can be finished by hardware, also can come the relevant hardware of instruction to finish by program, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be ROM (read-only memory), disk or CD etc.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a method for detecting short circuit is characterized in that, described method comprises:
Detect the first output current of the silicon controlled rectifier SCR of adjacent two-phase bypass in the three-phase bypass, and detect the second output current of the SCR of other adjacent two-phase bypass in the described three-phase bypass;
Judge whether described the first output current surpasses default current threshold, and judge whether described the second output current surpasses default current threshold;
Determine according to judged result whether described three-phase bypass exists short circuit.
2. method according to claim 1 is characterized in that, the first output current of the silicon controlled rectifier SCR of adjacent two-phase bypass in the bypass of described detection three-phase comprises:
Power on the first output current of the SCR of adjacent two-phase bypass in the front described three-phase bypass of detection;
The second output current of the SCR of other adjacent two-phase bypass in the described three-phase bypass of described detection comprises:
Power on the second output current of the SCR of other adjacent two-phase bypass in the front described three-phase bypass of detection.
3. method according to claim 1 is characterized in that, the first output current of the silicon controlled rectifier SCR of adjacent two-phase bypass in the bypass of described detection three-phase comprises:
Detect the first output current of the SCR of adjacent two-phase bypass in the three-phase bypass in service;
The second output current of the SCR of other adjacent two-phase bypass in the described three-phase bypass of described detection comprises:
Detect the second output current of the SCR of other adjacent two-phase bypass in the described three-phase bypass in service.
4. method according to claim 1 is characterized in that, the first output current of the silicon controlled rectifier SCR of adjacent two-phase bypass in the bypass of described detection three-phase comprises:
Adopt the first current sensor to be through and detect the first output current between the SCR back of adjacent two-phase bypass in the described three-phase bypass and the capacitive load;
The output current of the SCR of other adjacent two-phase bypass in the described three-phase bypass of described detection comprises:
Adopt the second current sensor to be through and detect the second output current between the SCR back of other adjacent two-phase bypass in the described three-phase bypass and the capacitive load.
5. method according to claim 1 is characterized in that, describedly judges that whether described the first output current surpasses default current threshold, and judges that whether described the second output current surpasses before the default current threshold, also comprises:
Described the first output current is carried out amplitude limit, amplification, filtering, rectification be treated to the first digital voltage signal, described the second output current is carried out amplitude limit, amplification, filtering, rectification be treated to the second digital voltage signal, and described default current threshold is carried out amplitude limit, amplification, filtering, rectification be treated to the voltage compare threshold;
More described the first digital voltage signal and described voltage compare threshold obtain the first comparative result, and more described the second digital voltage signal and described voltage compare threshold, obtain the second comparative result;
Describedly judge that whether described the first output current surpasses default current threshold, and judge that whether described the second output current surpasses default current threshold, comprising:
Judge according to described the first comparative result whether described the first output current surpasses default current threshold, and judge according to described the second comparative result whether described the second output current surpasses default current threshold.
6. method according to claim 1 or 5 is characterized in that, describedly determines that according to judged result whether described three-phase bypass exists short circuit, comprising:
If described the first output current surpasses default current threshold, and/or described the second output current surpasses default current threshold, determines that then there is short circuit in described three-phase bypass.
7. a short-circuit detecting device is characterized in that, described device comprises:
First detection module is for detection of the first output current of the silicon controlled rectifier SCR of adjacent two-phase bypass in the three-phase bypass;
The second detection module is for detection of the second output current of the SCR of other adjacent two-phase bypass in the described three-phase bypass;
Judge module is used for judging whether described the first output current surpasses default current threshold, and judges whether described the second output current surpasses default current threshold;
Determination module is used for determining according to the judged result of described judge module whether described three-phase bypass exists short circuit.
8. device according to claim 7 is characterized in that, described first detection module is for detection of the first output current of the SCR of adjacent two-phase bypass in the front described three-phase bypass that powers on;
Described the second detection module is for detection of the second output current of the SCR of other adjacent two-phase bypass in the front described three-phase bypass that powers on.
9. device according to claim 7 is characterized in that, described first detection module is for detection of the first output current of the SCR of adjacent two-phase bypass in the described three-phase bypass in service;
Described the second detection module is for detection of the second output current of the SCR of other adjacent two-phase bypass in the described three-phase bypass in service.
10. device according to claim 7 is characterized in that, described first detection module be used for to adopt the first current sensor to be through between the SCR back of the adjacent two-phase bypass of described three-phase bypass and the capacitive load and detects the first output current;
Described the second detection module be used for to adopt the second current sensor to be through between the SCR back of the other adjacent two-phase bypass of described three-phase bypass and the capacitive load and detects the second output current.
11. device according to claim 7 is characterized in that, described device also comprises:
Processing module, be used for that described the first output current is carried out amplitude limit, amplification, filtering, rectification and be treated to the first digital voltage signal, described the second output current is carried out amplitude limit, amplification, filtering, rectification be treated to the second digital voltage signal, and described default current threshold is carried out amplitude limit, amplification, filtering, rectification be treated to the voltage compare threshold;
Comparison module, be used for more described processing module and process the first digital voltage signal and the described voltage compare threshold that obtains, obtain the first comparative result, and more described processing module processes the second digital voltage signal and the described voltage compare threshold obtain, obtain the second comparative result;
Described judge module, be used for judging according to the first comparative result that described comparison module obtains whether described the first output current surpasses default current threshold, and judge according to the second comparative result that described comparison module obtains whether described the second output current surpasses default current threshold.
12. according to claim 7 or 11 described devices, it is characterized in that, described determination module, judge that described the first output current surpasses default current threshold if be used for described judge module, and/or, described judge module judges that described the second output current surpasses default current threshold, determines that then there is short circuit in described three-phase bypass.
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| CN112100945A (en) * | 2020-08-05 | 2020-12-18 | 苏州汇川联合动力系统有限公司 | Ground short circuit detection method, motor controller and computer readable storage medium |
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