CN105116259A - Actuation time detection apparatus, method and system of power protection device - Google Patents
Actuation time detection apparatus, method and system of power protection device Download PDFInfo
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- CN105116259A CN105116259A CN201510549089.1A CN201510549089A CN105116259A CN 105116259 A CN105116259 A CN 105116259A CN 201510549089 A CN201510549089 A CN 201510549089A CN 105116259 A CN105116259 A CN 105116259A
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Abstract
The invention, which relates to the technical field of power, discloses an actuation time detection apparatus, method and system of a power protection device. The apparatus is composed of a control unit, an optical coupler transmitting circuit, an optical coupler receiving circuit, a short circuit device and a magnetic ring; the optical coupler transmitting circuit, the optical coupler receiving circuit, the short circuit device and the magnetic ring are connected with the control unit; the optical coupler transmitting circuit is connected with a first end of a to-be-measured protection device; and the optical coupler receiving circuit is connected with a second end of the to-be-measured protection device. According to the invention, actuation time of a to-be-measured protection device from a closing state to a disconnecting state can be determined by a high frequency signal transmitted by the optical coupler receiving circuit and an induction signal generated by the magnetic ring; and the detection process is simple and the cost is low. Moreover, the detection precision at the us level can be realized and the tiny difference between the protection devices can be distinguished.
Description
Technical field
The present invention relates to technical field of electric power, particularly a kind of pick-up unit actuation time, method and system of power protection unit.
Background technology
Electric system Electrical Safety is concerning most important everyone; when the improper electricity consumption of user; during as line short or load surcharge, power protection unit, by starting protection action, prevents from causing unnecessary property loss or casualties because of improper electricity consumption.
Consider from electric system application point, the time of protection act is that The faster the better certainly.The coverage that improper electricity consumption causes is the smaller the better.According to a large amount of investigations to market historical product and existing power protection unit, power protection unit actuation time parameter from the hundreds of ms order of magnitude in past, develop tens ms, to several ms of today; Following development trend will be the power protection unit of more snap action speed.The quality assurance of power protection unit will be the most important thing concerning whole electric system.If because indivedual power protection unit is off quality, or the minute differences between power protection unit, all likely serious impact is caused on electric system.
So; accuracy of detection for power protection unit actuation time is more and more higher, but the accuracy of detection of existing tester only can ensure in ms level, such as: breaker operating characteristic tester; its temporal resolution is 0.1ms, cannot meet the demand of test manufacture high precision development.
Summary of the invention
For improving the accuracy of detection to power protection unit, the invention provides a kind of pick-up unit actuation time of power protection unit, described device comprises: control module, optocoupler radiating circuit, optocoupler receiving circuit, short-circuiting device and magnet ring, described optocoupler radiating circuit, optocoupler receiving circuit, short-circuiting device are all connected with described control module with magnet ring, described optocoupler radiating circuit is connected with the first end of protection device to be measured, and described optocoupler receiving circuit is connected with the second end of described protection device to be measured;
Described control module, for generation of high-frequency signal, transfers to described optocoupler radiating circuit by the high-frequency signal of generation, and sends short circuit pulse to described short-circuiting device;
Described optocoupler radiating circuit, for when described protection device to be measured is closure state, transfers to described optocoupler receiving circuit and short-circuiting device by the high-frequency signal received;
Described optocoupler receiving circuit, for receiving the high-frequency signal transmitted by described optocoupler radiating circuit, transfers to described control module by the high-frequency signal received;
Described short-circuiting device, for when receiving short circuit pulse, by the load short circuits of described protection device place to be measured circuit, to make described protection device to be measured from closure state action to off-state;
Described magnet ring, for when described short-circuiting device is by the load short circuits of described protection device place to be measured circuit, produces the induced signal corresponding to the high-frequency signal that described short-circuiting device receives, and the induced signal of generation is transferred to described control module;
Described control module, also for determining that described protection device to be measured is from closure state action to the actuation time of off-state according to the high-frequency signal received and induced signal.
Wherein, described optocoupler radiating circuit comprises: the first photoelectrical coupler, and the high-frequency signal that described optocoupler radiating circuit receives, by the input end of described first photoelectrical coupler, transfers to described optocoupler receiving circuit from the output terminal of described first photoelectrical coupler.
Wherein, described optocoupler receiving circuit comprises the second photoelectrical coupler, and the high-frequency signal that described optocoupler receiving circuit receives, by the input end of described second photoelectrical coupler, transfers to described control module from the output terminal of described second photoelectrical coupler.
Wherein, described control module, be further used for using the mistiming between the end time of the high-frequency signal received and the initial time of induced signal received as described protection device to be measured from closure state action to the actuation time of off-state.
Wherein, the load of described short-circuiting device and described protection device place to be measured circuit is connected in parallel.
Wherein, described magnet ring is arranged with the zero line of described protection device place to be measured circuit.
Wherein, described optocoupler radiating circuit and optocoupler receiving circuit and described protection device place to be measured circuit are not altogether.
Wherein, safety electric capacity is provided with between the first end of described optocoupler radiating circuit and described protection device to be measured.
The invention also discloses a kind of detection method actuation time of the power protection unit based on described device, described method comprises:
Control module produces high-frequency signal, and the high-frequency signal of generation is transferred to optocoupler radiating circuit;
The high-frequency signal received, when described protection device to be measured is closure state, is transferred to optocoupler receiving circuit and short-circuiting device by described optocoupler radiating circuit;
Described optocoupler receiving circuit receives the high-frequency signal transmitted by described optocoupler radiating circuit, and the high-frequency signal received is transferred to described control module;
Described control module sends short circuit pulse to described short-circuiting device;
Described short-circuiting device when receiving short circuit pulse, by the load short circuits of described protection device place to be measured circuit, to make described protection device to be measured from closure state action to off-state;
Magnet ring, when described short-circuiting device is by the load short circuits of described protection device place to be measured circuit, produces the induced signal corresponding to the high-frequency signal that described short-circuiting device receives, and the induced signal of generation is transferred to described control module;
According to the high-frequency signal received and induced signal, described control module determines that described protection device to be measured is from closure state action to the actuation time of off-state.
The invention also discloses a kind of detection system actuation time of power protection unit, described system comprises: some described devices, the optocoupler radiating circuit between each device and optocoupler receiving circuit are not altogether.
By the induced signal produced by high-frequency signal and the described magnet ring of described optocoupler receiving circuit transmission, the present invention can determine that described protection device to be measured is from closure state action to the actuation time of off-state; testing process is simple; with low cost; and achieve the accuracy of detection of us level, can minute differences between distinguishing protection device.
Accompanying drawing explanation
Fig. 1 be the power protection unit of one embodiment of the present invention actuation time pick-up unit structural representation;
Fig. 2 is the high-frequency signal transmission path schematic diagram of the device shown in Fig. 1;
Fig. 3 is the sequential chart of S1, S4, S6 and S7 in the device shown in Fig. 1;
Fig. 4 is the optocoupler radiating circuit of an embodiment of the present invention and the structural representation of optocoupler receiving circuit;
Fig. 5 be the power protection unit of one embodiment of the present invention actuation time detection method process flow diagram;
Fig. 6 be the power protection unit of one embodiment of the present invention actuation time detection system structural representation.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Select sky to open for power protection unit below and the present invention is described, certainly, described power protection unit also can be the devices such as insurance, relay.Fig. 1 be the power protection unit of one embodiment of the present invention actuation time pick-up unit structural representation; Fig. 2 is the high-frequency signal transmission path schematic diagram of the device shown in Fig. 1; With reference to Fig. 1 ~ 2, described device comprises: control module, optocoupler radiating circuit, optocoupler receiving circuit, short-circuiting device and magnet ring, described optocoupler radiating circuit, optocoupler receiving circuit, short-circuiting device are all connected with described control module with magnet ring, the first end (" P " namely in figure holds) that described optocoupler radiating circuit is opened with sky to be measured is connected, and the second end (" Q " namely in figure holds) that described optocoupler receiving circuit is opened with described sky to be measured is connected;
Described control module, for generation of high-frequency signal, transfers to described optocoupler radiating circuit by the high-frequency signal (" S1 " namely in figure) produced, and sends short circuit pulse (" S6 " namely in figure) to described short-circuiting device;
It should be noted that, the frequency of the high-frequency signal in present embodiment is 5MHz (namely the cycle is 0.2us), and certainly, the frequency of described high-frequency signal also can be set to other values, and present embodiment is not limited this.
Described optocoupler radiating circuit, for when described sky to be measured is opened as closure state, transfers to described optocoupler receiving circuit and short-circuiting device by the high-frequency signal received (" S2 " namely in figure);
Described optocoupler receiving circuit, for receiving the high-frequency signal (" S3 " namely in figure) transmitted by described optocoupler radiating circuit, transfers to described control module by the high-frequency signal received (" S4 " namely in figure);
Described short-circuiting device, for when receiving short circuit pulse, opens the load short circuits of place circuit by described sky to be measured, open from closure state action to off-state to make described sky to be measured;
In specific implementation, described sky to be measured is opened place circuit and is opened by sky to be measured and form with load in series, the P end that described sky to be measured is opened connects live wire (" L " namely in figure), the Q end that described sky to be measured is opened connects one end of described load, the other end of described load connects zero line (" N " namely in figure), so, open the load short circuits of place circuit for ease of making described sky to be measured, in present embodiment, the load that described short-circuiting device and described sky to be measured open place circuit is connected in parallel.
Described magnet ring, for when described sky to be measured is opened the load short circuits of place circuit by described short-circuiting device, produce the corresponding induced signal (" S7 " namely in figure) of the high-frequency signal (" S5 " namely in figure) received with described short-circuiting device, and the induced signal of generation is transferred to described control module;
Will be understood that, for ease of producing the induced signal corresponding to the high-frequency signal that described short-circuiting device receives, described magnet ring being arranged with the zero line that described sky to be measured opens place circuit.
Described control module, also for determining that described sky to be measured opens the actuation time from closure state action to off-state according to the high-frequency signal received and induced signal.
For ease of determining that described sky to be measured opens the actuation time from closure state action to off-state, the original state that described sky to be measured is opened is closure state, and the original state of short-circuiting device is off-state, with reference to Fig. 3, control module starts to receive S4, but is off state due to short-circuiting device, therefore, magnet ring can not produce induced signal S7, and control module does not receive S7.
Control module is after the t1 moment sends short circuit pulse S6 to short-circuiting device, because short-circuiting device action itself needs some times, so short-circuiting device is in t2 moment execution, and now control module starts to receive induced signal, certainly, after described short-circuiting device short circuit, sky meeting to be measured starts action because of overcurrent in the t2 moment, and need some times because sky to be measured starts work itself, the t3 moment completes disconnection, now, control module does not receive S4.
So, described control module can using the mistiming between the end time of the high-frequency signal received (i.e. t3 moment) and the initial time (i.e. t2 moment) of the induced signal received as described protection device to be measured from closure state action to the actuation time of off-state.
Due in present embodiment be using two moment between mistiming as described protection device to be measured from closure state action to the actuation time of off-state; and the cycle of high-frequency signal in present embodiment is 0.2us; so; the accuracy of detection of described actuation time is also 0.2us; certainly; improve the accuracy of detection of described actuation time if want, only need the frequency improving described high-frequency signal, and make optocoupler radiating circuit and optocoupler receiving circuit meet this frequency.
By the induced signal produced by high-frequency signal and the described magnet ring of described optocoupler receiving circuit transmission, present embodiment can determine that described protection device to be measured is from closure state action to the actuation time of off-state; testing process is simple; with low cost; and achieve the accuracy of detection of us level, can minute differences between distinguishing protection device.
In addition; because protection device to be measured is not all arranged in circuit by pick-up unit of the prior art; directly the protection device to be measured be not located in circuit is detected; make actuation time of measuring too idealized; but protection device to be measured is mounted to after in circuit; the actual act time is too wide in the gap with the actuation time of measuring; the reference significance little actuation time causing measuring; and the actuation time in present embodiment is detected when protection device to be measured is arranged in circuit, obviously more accurate than pick-up unit of the prior art.
Fig. 4 is the optocoupler radiating circuit of an embodiment of the present invention and the structural representation of optocoupler receiving circuit; With reference to Fig. 4, described optocoupler radiating circuit comprises: the first photoelectrical coupler IC1, the high-frequency signal that described optocoupler radiating circuit IC1 receives, by the input end of described first photoelectrical coupler (i.e. the 2nd end of IC1 and the 3rd end in figure), transmits (i.e. the 6th end of IC1 and the 5th end figure) to described optocoupler receiving circuit from the output terminal of described first photoelectrical coupler.
Described optocoupler receiving circuit comprises the second photoelectrical coupler IC2, the high-frequency signal that described optocoupler receiving circuit IC2 receives, by the input end of described second photoelectrical coupler (i.e. the 2nd end of IC2 and the 3rd end in figure), transfers to described control module from the output terminal of described second photoelectrical coupler (i.e. the 6th end of IC2 and the 5th end figure).
Open the power supply of place circuit to prevent described sky to be measured and (be generally the alternating current of 220V, and the forward voltage of photoelectrical coupler is generally no more than 3V) enter described optocoupler radiating circuit and optocoupler receiving circuit, and produce loop, cause device failure, so, described optocoupler radiating circuit and optocoupler receiving circuit and described sky to be measured open place circuit not altogether, namely the ground that the GND1 in figure opens place circuit with described sky to be measured is not connected, so when described empty opening and closing to be measured is closed, optocoupler radiating circuit and optocoupler receiving circuit are connected to described sky to be measured and open on the power supply of place circuit, two claws being just similar to bird ride on electric wire, big current can not be produced at described optocoupler radiating circuit and optocoupler receiving circuit.
In addition, moment from closure state action to off-state is opened for preventing described sky to be measured, the power supply that described sky to be measured opens place circuit enters described optocoupler radiating circuit or optocoupler receiving circuit, cause device to burn, between the P opened holds, be provided with safety electric capacity C1 in the present embodiment at described optocoupler radiating circuit and described sky to be measured.
In the present embodiment, the specification of described first safety electric capacity C1 is 1nF/2KV, below for electric capacity AC characteristic describes in detail;
The capacitive reactance computing formula of electric capacity is
1. the power supply of place circuit is opened for described sky to be measured, f=50Hz, C=0.001uF
Corresponding capacitive reactance is
2. for high-frequency signal, f=5 × 10
6hz, C=0.001uF
Corresponding capacitive reactance is
Namely this first safety electric capacity is 32 Ω to the capacitive reactance of high-frequency signal, described sky to be measured is opened to the power supply of place circuit, and capacitive reactance is 3 × 10
6Ω, so high-frequency signal can by described first safety electric capacity; The power supply that sky to be measured opens place circuit is then blocked, and cannot enter optocoupler radiating circuit and optocoupler receiving circuit;
Fig. 5 be the power protection unit of one embodiment of the present invention actuation time detection method process flow diagram; With reference to Fig. 5, described method comprises:
S501: control module produces high-frequency signal, and the high-frequency signal of generation is transferred to optocoupler radiating circuit;
S502: the high-frequency signal received, when described sky to be measured is opened as closure state, is transferred to optocoupler receiving circuit and short-circuiting device by described optocoupler radiating circuit;
S503: described optocoupler receiving circuit receives the high-frequency signal transmitted by described optocoupler radiating circuit, and the high-frequency signal received is transferred to described control module;
S504: described control module sends short circuit pulse to described short-circuiting device;
S505: described sky to be measured, when receiving short circuit pulse, is opened the load short circuits of place circuit by described short-circuiting device, opens from closure state action to off-state to make described sky to be measured;
S506: magnet ring, when described sky to be measured is opened the load short circuits of place circuit by described short-circuiting device, produces the induced signal corresponding to the high-frequency signal that described short-circuiting device receives, and the induced signal of generation is transferred to described control module;
S507: according to the high-frequency signal received and induced signal, described control module determines that described sky to be measured opens the actuation time from closure state action to off-state.
Namely the method for present embodiment can be used for the measurement of single protection device, and can be applicable to electric system protection device admission qualification rate and detect, certainly, also can be applicable to other scenes, present embodiment is not limited this.
Fig. 6 be the power protection unit of one embodiment of the present invention actuation time detection system structural representation; With reference to Fig. 6, described system comprises: some described devices, the optocoupler radiating circuit between each device and optocoupler receiving circuit are not altogether.
Based on the topological structure of cascade, difficult point is that how solving inter-stage high-frequency signal is had an impact mutually by AC line.Present embodiment adopts each optocoupler detecting device (for ease of explanation, so the combination of optocoupler radiating circuit and optocoupler receiving circuit is called optocoupler detecting device herein, the transmitting terminal of optocoupler detecting device is optocoupler radiating circuit, the receiving end of optocoupler detecting device is optocoupler receiving circuit) be separated power supply, not altogether, so the receiving end of optocoupler detecting device at different levels can not receive the signal of other optocoupler detecting device transmitting terminals, avoids erroneous judgement.
Present embodiment can be used in the measurement to different topology structure, may be used for the detection of building engineering construction side before electric wiring construction; Can detect by a control module state that multiple sky opens simultaneously, reduce further cost, when sky open break down time, can accurate failure judgement position fast, reduce accident impact scope and influence degree; Or Supervision Organization is to the detection of power engineering electrical performance index, larger guarantee will be obtained to the electrical safety of whole engineering;
Above embodiment is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. pick-up unit actuation time of a power protection unit, it is characterized in that, described device comprises: control module, optocoupler radiating circuit, optocoupler receiving circuit, short-circuiting device and magnet ring, described optocoupler radiating circuit, optocoupler receiving circuit, short-circuiting device are all connected with described control module with magnet ring, described optocoupler radiating circuit is connected with the first end of protection device to be measured, and described optocoupler receiving circuit is connected with the second end of described protection device to be measured;
Described control module, for generation of high-frequency signal, transfers to described optocoupler radiating circuit by the high-frequency signal of generation, and sends short circuit pulse to described short-circuiting device;
Described optocoupler radiating circuit, for when described protection device to be measured is closure state, transfers to described optocoupler receiving circuit and short-circuiting device by the high-frequency signal received;
Described optocoupler receiving circuit, for receiving the high-frequency signal transmitted by described optocoupler radiating circuit, transfers to described control module by the high-frequency signal received;
Described short-circuiting device, for when receiving short circuit pulse, by the load short circuits of described protection device place to be measured circuit, to make described protection device to be measured from closure state action to off-state;
Described magnet ring, for when described short-circuiting device is by the load short circuits of described protection device place to be measured circuit, produces the induced signal corresponding to the high-frequency signal that described short-circuiting device receives, and the induced signal of generation is transferred to described control module;
Described control module, also for determining that described protection device to be measured is from closure state action to the actuation time of off-state according to the high-frequency signal received and induced signal.
2. device as claimed in claim 1, it is characterized in that, described optocoupler radiating circuit comprises: the first photoelectrical coupler, the high-frequency signal that described optocoupler radiating circuit receives, by the input end of described first photoelectrical coupler, transfers to described optocoupler receiving circuit from the output terminal of described first photoelectrical coupler.
3. device as claimed in claim 2, it is characterized in that, described optocoupler receiving circuit comprises the second photoelectrical coupler, the high-frequency signal that described optocoupler receiving circuit receives, by the input end of described second photoelectrical coupler, transfers to described control module from the output terminal of described second photoelectrical coupler.
4. device as claimed in claim 1; it is characterized in that; described control module, be further used for using the mistiming between the end time of the high-frequency signal received and the initial time of induced signal received as described protection device to be measured from closure state action to the actuation time of off-state.
5. the device according to any one of Claims 1 to 4, is characterized in that, the load of described short-circuiting device and described protection device place to be measured circuit is connected in parallel.
6. the device according to any one of Claims 1 to 4, is characterized in that, described magnet ring is arranged with the zero line of described protection device place to be measured circuit.
7. the device according to any one of Claims 1 to 4, is characterized in that, described optocoupler radiating circuit and optocoupler receiving circuit and described protection device place to be measured circuit are not altogether.
8. device as claimed in claim 7, is characterized in that, be provided with safety electric capacity between the first end of described optocoupler radiating circuit and described protection device to be measured.
9. based on detection method actuation time for the power protection unit of the device of any one of claim 1 ~ 8, it is characterized in that, described method comprises:
Control module produces high-frequency signal, and the high-frequency signal of generation is transferred to optocoupler radiating circuit;
The high-frequency signal received, when described protection device to be measured is closure state, is transferred to optocoupler receiving circuit and short-circuiting device by described optocoupler radiating circuit;
Described optocoupler receiving circuit receives the high-frequency signal transmitted by described optocoupler radiating circuit, and the high-frequency signal received is transferred to described control module;
Described control module sends short circuit pulse to described short-circuiting device;
Described short-circuiting device when receiving short circuit pulse, by the load short circuits of described protection device place to be measured circuit, to make described protection device to be measured from closure state action to off-state;
Magnet ring, when described short-circuiting device is by the load short circuits of described protection device place to be measured circuit, produces the induced signal corresponding to the high-frequency signal that described short-circuiting device receives, and the induced signal of generation is transferred to described control module;
According to the high-frequency signal received and induced signal, described control module determines that described protection device to be measured is from closure state action to the actuation time of off-state.
10. detection system actuation time for power protection unit, is characterized in that, described system comprises: the device according to any one of some claims 1 ~ 8, and the optocoupler radiating circuit between each device and optocoupler receiving circuit are not altogether.
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| CN105116259B (en) | 2019-01-18 |
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