CN203191490U - A phase failure detecting system of the high voltage side of a transformer - Google Patents
A phase failure detecting system of the high voltage side of a transformer Download PDFInfo
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- CN203191490U CN203191490U CN 201220690005 CN201220690005U CN203191490U CN 203191490 U CN203191490 U CN 203191490U CN 201220690005 CN201220690005 CN 201220690005 CN 201220690005 U CN201220690005 U CN 201220690005U CN 203191490 U CN203191490 U CN 203191490U
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Abstract
The utility model discloses a phase failure detecting system of the high voltage side of a transformer. The phase failure detecting system comprises a measuring device, a trip-out controller, and a low-voltage-side on-off controller. The measuring device is connected between the three phases of the low voltage side of the transformer and a first node and is used for measuring the parameter of current voltage to earth of the three phases of the low voltage side. The trip controller is connected with the measuring device in parallel. One end of the trip-out controller is connected with the three phases of the low voltage side, while the other end of the trip-out controller is connected with a second node. The trip-out controller is used for giving a trip-out signal when determining a phase at a high voltage side is under an operating condition of phase failure according to the parameter of current voltage to earth of the three phases of the low voltage side. One end of the low-voltage-side on-off controller is connected with the second node, while the other end of the low-voltage-side on-off controller is connected with ground. The low-voltage-side on-off controller is used for acquiring the outputted electric energy at the low voltage side of the transformer according to the trip-out signal and turning on a switch at the low voltage side. The phase failure detecting system is capable of achieving effective and accurate determination of a fault of phase failure at the high voltage side and giving the trip-out signal according to the fault. Therefore, a switch tripping out effect at the low voltage side is achieved and thus electric device at the low voltage side are protected.
Description
Technical field
The utility model relates to the electric power detection range, in particular to the detection system of a kind of transformer high-voltage side phase failure.
Background technology
At present, in the 10kV electrical network, the transformer consumption of the transformer of 160-1600kVA capacity and 100-315kVA capacity is very big, in electrical network, all adopts high-tension fuse to tranformer protection for these transformers.
And the DYn11 winding of 10kV transformer is in the majority, arbitrary fusing (most cases is that one in the three-phase fuses and not intertrip of three-phase mutually) mutually in the three-phase high-voltage fuse, during other two-phase operate as normal, namely exist when the high-pressure side break one mutually after, low-pressure side voltage changes: low-pressure side has one, and relatively 220V is normal, two relatively are about 110V in addition, three-phase all has magnitude of voltage to exist, and the phasor angle is 180 degree and 0 degree, and the normal operation to some consumers of being contained in low-pressure side at this moment will exert an influence.Such as: three phase electric machine, monophase machine may burn in the case, cause device damage and property loss.So need transformer high-voltage phase failure situation is protected.
The general consumer that adopts following two kinds of methods protection low-pressure side in the prior art:
(1) the step down side master switch adopts the scheme of undervoltage trip: in low-side switch breaking coil is installed, but breaking coil can only be adorned one, also namely can only be according to the undervoltage trip of a phase, and breaking coil adopts AC220V or AC380V voltage; Transformer high-voltage side disconnected mutually after, the arbitrary mutually under-voltage possibility of low-pressure side has, the under-voltage coil of installing of AC220V not necessarily just in time is connected on under-voltagely to be gone up mutually, and this method can't be carried out sensitivity according to the high-pressure side phase failure and reacted and disconnected lock, thereby can damage the consumer to low-pressure side.
(2) the step down side master switch adopts the scheme of open-phase protection: and adopt open-phase protection; can detect when having one to lack mutually in low pressure A, B, the C three-phase; the size of all the other two-phases and the situation of phase invariant; and during the phase failure of high-pressure side, currently used open-phase protection can not solve the problem of damaging the low-pressure side consumer because of the high pressure phase failure.
As from the foregoing, during the phase failure of transformer high-voltage side, the low-pressure side voltage characteristic is neither the low pressure phase shortage, the under-voltage feature of low pressure that neither be simple, when using undervoltage trip or open-phase protection can't solve the high-pressure side phase failure to the protection of low-pressure side consumer.
When open phase fault appearred in the transformer high-voltage side, low-pressure side can't cause low-pressure side to export the problem that unstable voltage burns consumer accurately according to this fault trip, does not propose effective solution at present as yet at prior art.
The utility model content
At correlation technique when open phase fault appears in the transformer high-voltage side, low-pressure side can't be accurately according to this fault trip, cause low-pressure side to export the problem that unstable voltage burns consumer, effective solution is not proposed at present as yet, for this reason, fundamental purpose of the present utility model is to provide the detection system of a kind of transformer high-voltage side phase failure, to address the above problem.
To achieve these goals, according to an aspect of the present utility model, the detection system of a kind of transformer high-voltage side phase failure is provided, this system comprises: measurement mechanism, be connected between the low-pressure side three-phase and first node of transformer, be used for measuring the current voltage-to-ground parameter of low-pressure side three-phase, wherein, first node ground connection; The tripping operation controller, be associated with measurement mechanism, an end is connected with low-pressure side three, and the other end is connected in Section Point, be used for determining that according to the current voltage-to-ground parameter of low-pressure side three-phase high-pressure side one is under the situation of duty of the phase failure mutually, sends trip signal; The low-side switch controller, an end is connected with Section Point, and other end ground connection is used for obtaining the electric energy that step down side is exported according to trip signal, to open low-side switch.
Further, the low-pressure side three-phase comprises first phase, second mutually and third phase, and wherein, measurement mechanism comprises: first coil, be connected between first phase and the first node, and be used for by coil-induced first magnitude of voltage that obtains; Second coil is connected between second phase and the first node, is used for by coil-induced second magnitude of voltage that obtains; Tertiary coil is connected between third phase and the first node, is used for by the coil-induced tertiary voltage value of obtaining.
Further, the tripping operation controller comprises: first normally opened contact that is associated with first coil, first normally closed contact and second normally closed contact; Second normally opened contact that is associated with second coil, the 3rd normally closed contact and the 4th normally closed contact; The 3rd normally opened contact, 5 constant virtues closed contact and the 6th normally closed contact that are associated with tertiary coil, wherein, first normally opened contact and the 3rd normally closed contact and 5 constant virtues closed contact are connected in series and form the first tripping operation gauge tap, the first tripping operation gauge tap is associated with first coil, and the initialization state of the first tripping operation gauge tap is open mode; Second normally opened contact and first normally closed contact and the 6th normally closed contact are connected in series and form the second tripping operation gauge tap, and the second tripping operation gauge tap is associated with second coil, and the initialization state of the second tripping operation gauge tap is open mode; The 3rd normally opened contact and second normally closed contact and the 4th normally closed contact are connected in series and form the 3rd tripping operation gauge tap, and the 3rd tripping operation gauge tap is associated with tertiary coil, and the initialization state of the 3rd tripping operation gauge tap is open mode.
Further, the low-side switch controller comprises: breaking coil, be connected with Section Point by trip switch, and be used for obtaining the electric energy that low-pressure side first is exported mutually according to trip signal by induction; Trip switch, for the contact of opening trip switch by electric energy, linkage is opened low-side switch.
Further, the low-pressure side three-phase comprises first phase, second mutually and third phase, current voltage-to-ground parameter comprise first with second between mutually the first alternate angle, second mutually and the second alternate angle between the third phase and first angle mutually and between the third phase between the third phase, wherein, measurement mechanism comprises: the first sub-measuring instrument, be connected between first phase, second phase and the third phase, be used for measuring angle between the first alternate angle, the second alternate angle and third phase.
Further, the tripping operation controller comprises: first controller, be connected with the first sub-measuring instrument, be used for whether angle is respectively first threshold, second threshold value and the 3rd threshold value between the first alternate angle, the second alternate angle and third phase by detecting, control the duty whether high-pressure side one is in the phase failure mutually; Second controller, be connected with first controller, be used for being respectively under the situation of first threshold, second threshold value and the 3rd threshold value at angle between the first alternate angle, the second alternate angle and third phase, come the high-pressure side one of control transformer to be in the duty of the phase failure mutually, send trip signal.
Further, the low-pressure side three-phase comprises first phase, second mutually and third phase, current voltage-to-ground parameter comprise first with second between mutually first voltage between phases, second mutually and second voltage between phases between the third phase and first voltage mutually and between the third phase between the third phase, wherein, measurement mechanism comprises: the second sub-measuring instrument, be connected between first phase, second phase and the third phase, be used for measuring voltage between first voltage between phases, second voltage between phases and third phase.
Further, the tripping operation controller comprises: the 3rd controller, be connected with the second sub-measuring instrument, be used for whether reducing to the 4th threshold value respectively by detecting first voltage between phases and second voltage between phases, and whether voltage reduces to the 5th threshold value between third phase, controls the duty whether high-pressure side one is in the phase failure mutually; The 4th controller, be connected with the 3rd controller, be used for reducing to the 4th threshold value respectively at first voltage between phases and second voltage between phases, and voltage reduced under the situation of the 5th threshold value between third phase, come the high-pressure side one of control transformer to be in the duty of the phase failure mutually, send trip signal.
Further, the low-side switch controller comprises: connector, be connected between Section Point and the step down side, and be used for according to the circuit between trip signal connection trip switch and the step down side; Breaking coil is connected with Section Point by trip switch, is used for obtaining the electric energy that step down side is exported by coil-induced, and provides electric energy to trip switch; Trip switch, for the contact of opening trip switch by electric energy, linkage is opened low-side switch.
The detection system of the transformer high-voltage side phase failure by the application, determine the duty of the high-pressure side phase failure by the voltage characteristic that detects step down side, low-side switch tripping operation when determining to send trip signal after the duty of the high-pressure side phase failure, thereby solved in the prior art when open phase fault appears in the transformer high-voltage side, low-pressure side can't cause low-pressure side to export the problem that unstable voltage burns consumer accurately according to this fault trip.Realized judging effectively and accurately the fault of the high-pressure side phase failure and accordingly fault send trip signal, thereby the effect that makes the low-side switch tripping operation, thereby can protect the consumer of low-pressure side.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes the application's a part, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not constitute improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation according to the detection system of the transformer high-voltage side phase failure of the utility model embodiment;
Fig. 2 is the detailed maps of detection system of the transformer high-voltage side phase failure of embodiment as shown in Figure 1;
Fig. 3 is the detailed maps of detection system of the transformer high-voltage side phase failure of another embodiment as shown in Figure 1; And
Fig. 4 is the process flow diagram according to the detection method of the transformer high-voltage side phase failure of the utility model embodiment.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the utility model below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Fig. 1 is the structural representation according to the detection system of the transformer high-voltage side phase failure of the utility model embodiment.As shown in Figure 1, this system comprises: measurement mechanism 10, be connected between the low-pressure side three-phase and first node of transformer, and be used for measuring the current voltage-to-ground parameter of low-pressure side three-phase, wherein, first node ground connection; Tripping operation controller 30 is connected in parallel with measurement mechanism 10, is used for sending trip signal when determining that according to the current voltage-to-ground parameter of low-pressure side three-phase high-pressure side one is in the duty of the phase failure mutually; Low-side switch controller 50, one ends are connected with Section Point, and other end ground connection is for the electric energy that obtains power supply according to trip signal, to open low-side switch.After opening low-side switch, transformer stops to the consumer power supply, and wherein, the initialization state of low-side switch is closure state.
Adopt the detection system of the application's the transformer high-voltage side phase failure, measure the current voltage-to-ground parameter of low-pressure side three-phase by measurement mechanism, the gauge tap that trips then is when determining that according to the current voltage-to-ground parameter of low-pressure side three-phase high-pressure side one is in the duty of the phase failure mutually, send trip signal, and obtain the electric energy of power supply according to trip signal by the low-side switch controller, and open low-side switch by electric energy, so that transformer stops to power to consumer.The detection system of the transformer high-voltage side phase failure by the application; determine the duty of the high-pressure side phase failure by the voltage characteristic that detects step down side; low-side switch tripping operation when determining to send trip signal after the duty of the high-pressure side phase failure; thereby solved in the prior art when open phase fault appears in the transformer high-voltage side; low-pressure side can't be accurately according to this fault trip; cause low-pressure side to export the problem that unstable voltage burns consumer; realized judging effectively and accurately the fault of the high-pressure side phase failure and accordingly fault send trip signal; thereby make the effect of low-side switch tripping operation, thereby can protect the consumer of low-pressure side.
Wherein, in the low-side switch controller 50 shunted exciter tripping is installed, correctly reflects the current voltage-to-ground parameter of low-pressure side three-phase, can adopt integrated relay or other monitoring voltage devices that this voltage characteristic is monitored and judge.Be in the duty of the phase failure according to current voltage-to-ground parameter mutually in case determine transformer high-voltage side one, tripping operation controller 30 sends trip command (being trip signal).The application's detection system is preferred in the DYn11 winding transformer high pressure phase failure monitor protection; detection system in the present embodiment is installed on step down side; when the DYn11 transformer high-voltage disconnected arbitrary mutually after; under the effect of native system; the low-side switch controller 50 that shunted exciter tripping is installed is threaded off trip, so that transformer stops to power to consumer.
In above-described embodiment of the application; accurately judge DYn11 transformer high-voltage side open phase fault by the low-pressure side voltage characteristic; with the timely separating brake of low-side switch, can avoid many scaling loss to the responsive electrical equipment of voltage fluctuation, protection user property is avoided loss; avoid taking place the property dispute between Utilities Electric Co. and the user; avoid claim, will bring direct economic benefit and social benefit, saved a lot of equipment investments; and human resources are saved in native system installation, use, easy to maintenance.
In addition, this product can be widely used in city old station transformation, the increase-volume of old station, the newly-built case variable order, because this system is non-maintaining, is not affected by the external environment, and the influence that causes after having avoided transformer voltage to reduce effectively has potential social benefit.
In above-described embodiment of the application, the low-pressure side three-phase comprises first phase, second mutually and third phase, and wherein, measurement mechanism 10 can comprise: first coil 11, be connected between first phase and the first node, and be used for by coil-induced first magnitude of voltage that obtains; Second coil 13 is connected between second phase and the first node, is used for by coil-induced second magnitude of voltage that obtains; Tertiary coil 15 is connected between third phase and the first node, is used for by the coil-induced tertiary voltage value of obtaining.Wherein, the rated operational voltage value of first coil 11, second coil 13 and tertiary coil 15 all can be 220V.
In above-described embodiment of the application, tripping operation controller 30 can comprise: first normally opened contact 111, first normally closed contact 113 and second normally closed contact 115 corresponding with first coil 11; Second normally opened contact 131, three normally closed contact 133 and four normally closed contact 135 corresponding with second coil 13; Three normally opened contact 151,5 constant virtues closed contact 153 and six normally closed contact 155 corresponding with tertiary coil 15, wherein, first normally opened contact 111 and the 3rd normally closed contact 133 and 5 constant virtues closed contact 153 are connected in series and form the first tripping operation gauge tap, and first trip switch and first coil 11 are connected in parallel; Second normally opened contact 131 and first normally closed contact 113 and the 6th normally closed contact 155 are connected in series and form the second tripping operation gauge tap, and second trip switch and second coil 13 are connected in parallel; The 3rd normally opened contact 151 and second normally closed contact 115 and the 4th normally closed contact 135 are connected in series and form the 3rd tripping operation gauge tap, and the 3rd trip switch and tertiary coil 15 are connected in parallel.Wherein, be the load voltage value of first phase at first magnitude of voltage, and when first magnitude of voltage is respectively the twice of second magnitude of voltage and tertiary voltage value, 11 adhesives of first coil, first normally opened contact 111 closures corresponding with first coil 11, first normally closed contact 113 and second normally closed contact 115 are opened, first trip switch is converted to closure state by open mode, connect first with the circuit of low-side switch controller 50, and the electric current in the circuit is sent to low-side switch as trip signal.Wherein, first phase, second is equal with the load voltage value of third phase mutually, is 220V.
Fig. 2 is the detailed maps of detection system of the transformer high-voltage side phase failure of embodiment as shown in Figure 1.
Particularly, as shown in Figure 2, the measurement mechanism 10 in above-described embodiment and tripping operation controller 30 can be realized by integrated relay.Wherein, the low-pressure side three-phase is respectively: the A phase, B mutually with C mutually, first coil 11 of relay is connected between first phase and the first node, be used for by the coil-induced current voltage-to-ground (i.e. first magnitude of voltage) that measures first phase, second coil 13 of relay is connected between second phase and the first node, be used for by the coil-induced current voltage-to-ground (i.e. second magnitude of voltage) that measures second phase, the tertiary coil 15 of relay is connected between third phase and the first node, be used for by the coil-induced current voltage-to-ground (being the tertiary voltage value) that measures third phase, and, first coil 11 of relay, second coil 13 and tertiary coil 15 have with it a normally opened contact and two normally closed contacts accordingly respectively, as shown in Figure 2, first normally opened contact 111, first normally closed contact 113 and second normally closed contact 115 are corresponding with first coil 11, second normally opened contact 131, the 3rd normally closed contact 133 and the 4th normally closed contact 135 are corresponding with second coil 13, the 3rd normally opened contact 151,5 constant virtues closed contact 153 and the 6th normally closed contact 155 are corresponding with tertiary coil 15.Wherein, first node ground connection (i.e. the end of GND among the figure).
Particularly, in the above-described embodiments, first normally opened contact 111, the 3rd normally closed contact 133 and 5 constant virtues closed contact 153 are connected in series and form the first tripping operation gauge tap, second normally opened contact 131 and first normally closed contact 113 and the 6th normally closed contact 155 are connected in series and form the second tripping operation gauge tap, the 3rd normally opened contact 151 and second normally closed contact 115 and the 4th normally closed contact 135 are connected in series and form the 3rd tripping operation gauge tap, and three tripping operation gauge tap are connected in parallel with first coil 11, second coil 13 and tertiary coil 15 respectively.The rated operational voltage value of three coils is 220V, equate with the load voltage value of first phase, be the i.e. load voltage value of first phase of 220V(at first magnitude of voltage), and when first magnitude of voltage is respectively the twice of second magnitude of voltage and tertiary voltage value when (110V), 11 adhesives of first coil, first normally opened contact, 111 closures, first normally closed contact 113 and second normally closed contact 115 are opened, at this moment, the first tripping operation gauge tap closure, the second tripping operation gauge tap and the 3rd tripping operation gauge tap are in open mode, thereby send trip signal by first trip switch, and low-pressure side first is connected circuit by the first tripping operation gauge tap and low-side switch controller 50 mutually, with the electric current in this circuit as trip signal, the triggering low-side switch is opened, and the output of step down side first phase simultaneously can be used as the power supply of low-side switch tripping operation, for the tripping operation of low-side switch provides electric energy.
Above-described embodiment according to the application, low-side switch controller 50 can comprise: breaking coil, be connected with Section Point by trip switch, be used for obtaining the electric energy that low-pressure side first is exported mutually according to trip signal by induction, and provide electric energy to trip switch; Trip switch is for the contact of opening trip switch by electric energy, so that transformer stops to power to consumer.
Particularly; the initialization state of trip switch is closure state; when step down side first is connected circuit by the first tripping operation gauge tap and low-side switch controller 50 mutually; breaking coil is sensed change in voltage; adhesive brake cable circle; make the contact that the trip switch electric energy that induction is obtained according to trip signal and breaking coil is opened trip switch; so that transformer stops to power to consumer; thereby when the phase failure of transformer high-voltage side; low-side switch can disconnect exactly, the protection consumer.
The situation that above-described embodiment of the application changes by the current voltage-to-ground that detects the step down side three-phase, when the voltage of appointing two-phase is reduced to former rated voltage half size approximately, when another keeps primary voltage constant mutually, can determine effectively that transformer high-voltage side one is in the duty of the phase failure mutually, send trip signal, make low-side switch open, power to consumer thereby stop transformer that the subscriber equipment of avoiding the step down side electric voltage exception to cause damages.
In the above-described embodiments, the shunted exciter tripping of step down side on-off controller 50 needs the above power supply of a 50V at least, therefore need provide independent one road power supply that always exists or with the alternating current of direct supply inversion at step down side, so that after transformer high-voltage side phase failure situation occurring, for the step down side switch opens.Yet; a road independent stabilized power source is provided, can increases equipment cost, and increase maintenance workload; adopt above-described embodiment of the application; when tripping operation controller 30 sends trip signal, connect the circuit of step down side and low-side switch, thereby when transformer high-voltage side generation open phase fault; the electric energy of low-pressure side output is as trip command; the triggering low-side switch is opened, so that transformer stops to the consumer power supply, with the consumer of protection step down side.
In above-described embodiment of the application, the low-pressure side three-phase comprises first phase, second mutually and third phase, current voltage-to-ground parameter comprise first with second between mutually the first alternate angle, second mutually and the second alternate angle between the third phase and first angle mutually and between the third phase between the third phase, wherein, measurement mechanism 10 can comprise: the first sub-measuring instrument, be connected between first phase, second phase and the third phase, be used for measuring angle between the first alternate angle, the second alternate angle and third phase.
Above-described embodiment according to the application, tripping operation controller 30 can comprise: first controller, be connected with the first sub-measurement mechanism 10, be used for whether angle is respectively first threshold, second threshold value and the 3rd threshold value between the first alternate angle, the second alternate angle and third phase by detecting, control the duty whether the high pressure three-phase is in the phase failure; Second controller, be connected with first controller, be used for being respectively under the situation of first threshold, second threshold value and the 3rd threshold value at angle between the first alternate angle, the second alternate angle and third phase, the high-pressure side one of control transformer is in the duty of the phase failure mutually, sends trip signal.
Wherein, first threshold is 180 degree, and second threshold value is 180 degree, and the 3rd threshold value is 0 degree.
Fig. 3 is the detailed maps of detection system of the transformer high-voltage side phase failure of another embodiment as shown in Figure 1.
Particularly, the low-pressure side three-phase comprises first phase, second phase and the third phase, current voltage-to-ground parameter comprise first with second the first alternate angle between mutually, second mutually with third phase between the second alternate angle and first angle mutually and between the third phase between the third phase, wherein, as shown in Figure 3, measurement mechanism 10 can comprise: the first sub-measuring instrument, be connected in first phase, between second phase and the third phase, be used for measuring the first alternate angle, angle between the second alternate angle and third phase, after the first sub-measuring instrument measures three alternate angles, can be by first controller of tripping operation controller 30, by detecting the first alternate angle, whether angle is respectively first threshold between the second alternate angle and third phase, second threshold value determines with the 3rd threshold value whether high-pressure side one is in the duty of the phase failure mutually, at the first alternate angle, angle is respectively first threshold between the second alternate angle and third phase, under the situation of second threshold value and the 3rd threshold value, the high-pressure side one of the second controller control transformer is in the duty of the phase failure mutually, sends trip signal.Wherein, first threshold can be 180 degree, and second threshold value can be 180 degree, and the 3rd threshold value can be 0 degree.Wherein, can adopt the digital monitoring arrangement of microcomputer type that the current voltage-to-ground parameter of low-pressure side three-phase is sampled, the simulating signal that sampling is obtained is transformed to digital signal, obtain the vector angle of three-phase voltage based on the digital computation of CPU or PLC, and judge to determine the duty of transformer high-voltage side phase, export trip signal then.
In above-described embodiment of the application, the low-pressure side three-phase comprises first phase, second mutually and third phase, current voltage-to-ground parameter comprise first with second between mutually first voltage between phases, second mutually and second voltage between phases between the third phase and first voltage mutually and between the third phase between the third phase, wherein, measurement mechanism 10 comprises: the second sub-measuring instrument, be connected between first phase, second phase and the third phase, be used for measuring voltage between first voltage between phases, second voltage between phases and third phase.
Above-described embodiment according to the application, tripping operation controller 30 comprises: the 3rd controller, be connected with the second sub-measuring instrument, whether reduce to the 4th threshold value respectively for detection of first voltage between phases and second voltage between phases, and whether voltage reduces to the 5th threshold value between third phase, controls the duty whether high-pressure side one is in the phase failure mutually; The 4th controller, be connected with the 3rd controller, be used for reducing to the 4th threshold value respectively at first voltage between phases and second voltage between phases, and voltage reduced under the situation of the 5th threshold value between third phase, come the high-pressure side one of control transformer to be in the duty of the phase failure mutually, send trip signal.
Wherein, the 4th threshold value is that 86.7%, the five threshold value of voltage between phases ratings is 0 volt.
Particularly, the low-pressure side three-phase comprises first phase, second phase and the third phase, current voltage-to-ground parameter comprise first with second first voltage between phases between mutually, second mutually with third phase between second voltage between phases and first voltage mutually and between the third phase between the third phase, wherein, measurement mechanism 10 can comprise: the second sub-measuring instrument, be connected in first phase, between second phase and the third phase, be used for measuring first voltage between phases, voltage between second voltage between phases and third phase, after the second sub-measuring instrument measures three voltages between phases, can whether reduce to the 4th threshold value respectively by detecting first voltage between phases and second voltage between phases by the 3rd controller of tripping operation gauge tap 30, and whether voltage is reduced to the 5th threshold value and is controlled the duty whether high-pressure side one is in the phase failure mutually between third phase, reduce to the 4th threshold value respectively at first voltage between phases and second voltage between phases, and voltage is reduced under the situation of the 5th threshold value between third phase, the high-pressure side one of the 4th controller control transformer is in the duty of the phase failure mutually, sends trip signal.Wherein, the 4th threshold value can be 0 volt for 86.7%, the five threshold value of voltage between phases ratings.Wherein, can adopt the digital monitoring arrangement of microcomputer type that the current voltage-to-ground parameter of low-pressure side three-phase is sampled, the simulating signal that sampling is obtained is transformed to digital signal, obtain the vector angle of three-phase voltage based on the digital computation of CPU or PLC, and judge to determine the duty of transformer high-voltage side phase, export trip signal then.
In above-described embodiment of the application, low-side switch controller 50 can comprise: connector, be connected between Section Point and the step down side, and be used for according to the loop between trip signal connection trip switch and the step down side; Breaking coil is connected with Section Point by trip switch, is used for obtaining the electric energy that step down side is exported according to trip signal by coil-induced, and provides electric energy to trip switch; Trip switch is for the contact of opening trip switch by electric energy, so that transformer stops to power to consumer.
Particularly, the 4th controller sends after the trip signal, connector gets access to trip signal, connect the circuit between trip switch and the step down side, breaking coil is sensed the change in voltage in the loop then, obtains the electric energy of step down side output, and adhesive brake cable circle, make the contact of trip switch open, so that transformer stops to power to consumer.In addition, low-side switch controller 50 also can trip the output of step down side as low-side switch electric energy, (being about to step down side output as the working power of low-side switch controller 50 shunt opening coils) reduced extra arrangements of components and design.
Fig. 4 is the process flow diagram according to the detection method of the transformer high-voltage side phase failure of the utility model embodiment.As shown in Figure 4, this method comprises the steps:
Step S102, the current voltage-to-ground parameter of the low-pressure side three-phase of measuring transformer.
Step S104 determines according to the current voltage-to-ground parameter of low-pressure side three-phase whether the high-pressure side one of transformer is in the duty of the phase failure mutually.
Step S106 is in mutually in high-pressure side one under the situation of duty of the phase failure, sends trip signal to open low-side switch.Wherein, open after the low-side switch, transformer stops to the consumer power supply, and the initialization state of low-side switch is closure state.Wherein, low-side switch is arranged on step down side, opens low-side switch and can realize that transformer stops power supply to consumer, and closed low side switch realizes that transformer continues to power to consumer; Consumer can be user's electrical equipment, as refrigerator, electromagnetic oven etc.
Adopt the detection method of the application's the transformer high-voltage side phase failure, the current voltage-to-ground parameter of the low-pressure side three-phase by measuring transformer, and judge according to the current voltage-to-ground parameter of low-pressure side three-phase whether the high-pressure side one of transformer is in the duty of the phase failure mutually, be in mutually in high-pressure side one under the situation of duty of the phase failure, send trip signal, open low-side switch according to trip signal afterwards, so that transformer stops to power to consumer.The detection method of the transformer high-voltage side phase failure by the application; determine the duty of the high-pressure side phase failure by the voltage characteristic that detects step down side; low-side switch tripping operation when determining to send trip signal after the duty of the high-pressure side phase failure; thereby solved in the prior art when open phase fault appears in the transformer high-voltage side; low-pressure side can't be accurately according to this fault trip; cause low-pressure side to export the problem that unstable voltage burns consumer; realized judging effectively and accurately the fault of the high-pressure side phase failure and accordingly fault send trip signal; thereby make the effect of low-side switch tripping operation, thereby can protect the consumer of low-pressure side.
In the application's first embodiment, the low-pressure side three-phase comprises first phase, second phase and the third phase, current voltage-to-ground parameter comprises first magnitude of voltage of first phase, second magnitude of voltage of second phase and the tertiary voltage value of third phase, wherein, whether determine that according to the current voltage-to-ground parameter of low-pressure side three-phase the step whether high-pressure side one of transformer is in the duty of the phase failure mutually comprises: detecting first magnitude of voltage is the load voltage value of first phase, and whether first magnitude of voltage is respectively the twice of second magnitude of voltage and tertiary voltage value, wherein, be load voltage value at first magnitude of voltage, and first magnitude of voltage is respectively under the situation of twice of second magnitude of voltage and tertiary voltage value, determines that high-pressure side one is in the duty of the phase failure mutually.Wherein, the load voltage value of low-pressure side three-phase equates, all can be 220V.
Particularly, when the transformer high-voltage open phase fault occurring, the voltage characteristic of low-pressure side can be: it is rated voltage that a phase-to-ground voltage is arranged in the low-pressure side three-phase, all the other two voltage-to-grounds are reduced to half size of load voltage value, use above-mentioned detection method, whether first magnitude of voltage that detects low-pressure side first phase is the load voltage value of first phase, and whether first magnitude of voltage is respectively the twice of the tertiary voltage value of second magnitude of voltage of second phase and third phase, if words, then the transformer high-voltage side is in the duty of the phase failure, the current voltage-to-ground value that also is low-pressure side first phase is 220V, and when the current voltage-to-ground value of second phase and third phase was 110V, the transformer high-voltage side was in the duty of the phase failure.
In the application's second embodiment, the low-pressure side three-phase comprises first phase, second phase and the third phase, current voltage-to-ground parameter comprise first with second the first alternate angle between mutually, second mutually with third phase between the second alternate angle and first angle mutually and between the third phase between the third phase, wherein, determine that according to the current voltage-to-ground parameter of low-pressure side three-phase the step whether high-pressure side one of transformer is in the duty of the phase failure mutually comprises: detect the first alternate angle, whether angle is respectively first threshold between the second alternate angle and third phase, second threshold value and the 3rd threshold value, wherein, at the first alternate angle, angle is respectively first threshold between the second alternate angle and third phase, under the situation of second threshold value and the 3rd threshold value, determine that the high-pressure side one of transformer is in the duty of the phase failure mutually.
According to above-described embodiment of the application, first threshold is 180 degree, and second threshold value is 180 degree, and the 3rd threshold value is 0 degree.
Particularly, when the transformer high-voltage open phase fault occurring, the voltage characteristic of low-pressure side can be: three-phase all has magnitude of voltage to exist, and alternate vector angle between any two (being alternate angle) is respectively: 180 degree, 180 degree and 0 degree.Use the above embodiments of the present application to detect whether angle is respectively first threshold, second threshold value and the 3rd threshold value between the first alternate angle, the second alternate angle and third phase, be respectively at angle between the first alternate angle, the second alternate angle and third phase under the situation of 180 degree, 180 degree and 0 degree, determine that the high-pressure side one of transformer is in the duty of the phase failure mutually.
In the application's the 3rd embodiment, current voltage-to-ground parameter comprises low-pressure side first and second first voltage between phases between mutually, second mutually with third phase between second voltage between phases and first voltage mutually and between the third phase between the third phase, wherein, determine that according to the current voltage-to-ground parameter of low-pressure side three-phase the step whether high-pressure side one of transformer is in the duty of the phase failure mutually comprises: detect first voltage between phases and whether second voltage between phases reduces to the 4th threshold value, and whether voltage reduces to the 5th threshold value between third phase, wherein, reduce to the 4th threshold value at first voltage between phases and second voltage between phases, and voltage is reduced under the situation of the 5th threshold value between third phase, determines that the high-pressure side one of transformer is in the duty of the phase failure mutually.
In above-described embodiment of the application, the 4th threshold value is that 86.7%, the five threshold value of voltage between phases ratings is 0 volt.
Particularly, when the transformer high-voltage open phase fault occurring, the voltage characteristic of low-pressure side can also be: in three voltages between phases of low-pressure side three-phase, have two 86.7%, one voltages between phases reducing to ratings to reduce to about 0 volt.When using said method to detect the phase failure of transformer high-voltage side, detect first voltage between phases and whether second voltage between phases reduces to 86.7% of ratings, and whether voltage reduces to 0 volt between third phase, reduce to 86.7% of ratings at first voltage between phases and second voltage between phases, and voltage is reduced under 0 volt the situation between third phase, determines that the high-pressure side one of transformer is in the duty of the phase failure mutually.
Can determine according to above-mentioned three embodiment of the application whether the high-pressure side one of transformer is in the duty of the phase failure mutually, one when being in the duty of the phase failure mutually in the high-pressure side, sends trip signal.
According to above-described embodiment of the application, open low-side switch according to trip signal, so that transformer stops to comprise to the step of consumer power supply: the power supply of connecting the low-side switch controller according to trip signal; Low-side switch is opened by the electric energy that power supply provides, so that transformer stops to power to consumer.Wherein, the power supply that the output of step down side can be tripped as low-side switch.
Particularly, can connect circuit between low-side switch controller and the step down side according to trip signal, with the power supply that the output of step down side is tripped as the low-side switch controller, the low-side switch controller is opened by the output electric energy of step down side, so that transformer stops to power to consumer.
Need to prove, can in the computer system such as one group of computer executable instructions, carry out in the step shown in the process flow diagram of accompanying drawing, and, though there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.
From above description; as can be seen; the utility model has been realized following technique effect: the detection system of the transformer high-voltage side phase failure by the application; determine the duty of the high-pressure side phase failure by the voltage characteristic that detects step down side; low-side switch controller tripping operation when determining to send trip signal after the duty of the high-pressure side phase failure; thereby solved in the prior art when open phase fault appears in the transformer high-voltage side; low-pressure side can't be accurately according to this fault trip; cause low-pressure side to export the problem that unstable voltage burns consumer; realized judging effectively and accurately the fault of the high-pressure side phase failure and accordingly fault send trip signal; thereby make the effect of low-side switch tripping operation, thereby can protect the consumer of low-pressure side.
The above is preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (9)
1. the detection system of the transformer high-voltage side phase failure is characterized in that, comprising:
Measurement mechanism is connected between the low-pressure side three-phase and first node of transformer, is used for measuring the current voltage-to-ground parameter of described low-pressure side three-phase, wherein, and described first node ground connection;
The tripping operation controller, be associated with described measurement mechanism, an end is connected with described low-pressure side three, and the other end is connected in Section Point, be used for determining that according to the current voltage-to-ground parameter of described low-pressure side three-phase high-pressure side one is under the situation of duty of the phase failure mutually, sends trip signal;
The low-side switch controller, an end is connected with described Section Point, and other end ground connection is used for obtaining the electric energy that step down side is exported according to described trip signal, to open low-side switch.
2. system according to claim 1 is characterized in that, described low-pressure side three-phase comprises first phase, second mutually and third phase, and wherein, described measurement mechanism comprises:
First coil, be connected in described first and described first node between, be used for by coil-induced first magnitude of voltage that obtains;
Second coil, be connected in described second and described first node between, be used for by coil-induced second magnitude of voltage that obtains;
Tertiary coil is connected between described third phase and the described first node, is used for by the coil-induced tertiary voltage value of obtaining.
3. system according to claim 2 is characterized in that, described tripping operation controller comprises:
First normally opened contact, first normally closed contact and second normally closed contact that are associated with described first coil;
Second normally opened contact, the 3rd normally closed contact and the 4th normally closed contact that are associated with described second coil;
The 3rd normally opened contact, 5 constant virtues closed contact and the 6th normally closed contact that are associated with described tertiary coil,
Wherein, described first normally opened contact and described the 3rd normally closed contact and described 5 constant virtues closed contact are connected in series and form the first tripping operation gauge tap, the described first tripping operation gauge tap is associated with described first coil, and the initialization state of the described first tripping operation gauge tap is open mode;
Described second normally opened contact and described first normally closed contact and described the 6th normally closed contact are connected in series and form the second tripping operation gauge tap, the described second tripping operation gauge tap is associated with described second coil, and the initialization state of the described second tripping operation gauge tap is open mode;
Described the 3rd normally opened contact and described second normally closed contact and described the 4th normally closed contact are connected in series and form the 3rd tripping operation gauge tap, described the 3rd tripping operation gauge tap is associated with described tertiary coil, and the initialization state of described the 3rd tripping operation gauge tap is open mode.
4. system according to claim 3 is characterized in that, described low-side switch controller comprises:
Breaking coil is connected with described Section Point by trip switch, is used for obtaining the electric energy that described low-pressure side first is exported mutually according to trip signal by induction;
Described trip switch, for the contact of opening described trip switch by described electric energy, linkage is opened described low-side switch.
5. system according to claim 1, it is characterized in that, described low-pressure side three-phase comprises first phase, second mutually and third phase, described current voltage-to-ground parameter comprise described first with described second between mutually the first alternate angle, described second mutually and the second alternate angle between the third phase and described first and described third phase between third phase between angle, wherein, described measurement mechanism comprises:
The first sub-measuring instrument is connected in described first phase, second mutually and between the third phase, is used for measuring angle between the described first alternate angle, the described second alternate angle and described third phase.
6. system according to claim 5 is characterized in that, described tripping operation controller comprises:
First controller, be connected with the described first sub-measuring instrument, be used for whether angle is respectively first threshold, second threshold value and the 3rd threshold value between the described first alternate angle, the described second alternate angle and described third phase by detecting, control the duty whether described high-pressure side one is in the phase failure mutually;
Second controller, be connected with described first controller, be used for being respectively under the situation of described first threshold, described second threshold value and described the 3rd threshold value at angle between the described first alternate angle, the described second alternate angle and described third phase, the high-pressure side one of controlling described transformer is in the duty of the phase failure mutually, sends described trip signal.
7. system according to claim 6, it is characterized in that, described low-pressure side three-phase comprises first phase, second mutually and third phase, described current voltage-to-ground parameter comprise described first with described second between mutually first voltage between phases, described second mutually and second voltage between phases between the third phase and described first and described third phase between third phase between voltage, wherein, described measurement mechanism comprises:
The second sub-measuring instrument is connected in described first phase, second mutually and between the third phase, is used for measuring voltage between described first voltage between phases, described second voltage between phases and described third phase.
8. system according to claim 7 is characterized in that, described tripping operation controller comprises:
The 3rd controller, be connected with the described second sub-measuring instrument, be used for by detecting described first voltage between phases and whether described second voltage between phases reduces to the 4th threshold value respectively, and whether voltage reduces to the 5th threshold value between described third phase, controls the duty whether described high-pressure side one is in the phase failure mutually;
The 4th controller, be connected with described the 3rd controller, be used for reducing to the 4th threshold value respectively at described first voltage between phases and described second voltage between phases, and voltage is reduced under the situation of the 5th threshold value between described third phase, the high-pressure side one of controlling described transformer is in the duty of the phase failure mutually, sends described trip signal.
9. according to claim 4 or 7 described systems, it is characterized in that described low-side switch controller comprises:
Connector is connected between described Section Point and the step down side, is used for according to the circuit between described trip signal connection trip switch and the described step down side;
Breaking coil is connected with described Section Point by trip switch, is used for obtaining the electric energy that described step down side is exported by coil-induced, and provides described electric energy to described trip switch;
Described trip switch, for the contact of opening described trip switch by described electric energy, linkage is opened described low-side switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220690005 CN203191490U (en) | 2012-12-13 | 2012-12-13 | A phase failure detecting system of the high voltage side of a transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220690005 CN203191490U (en) | 2012-12-13 | 2012-12-13 | A phase failure detecting system of the high voltage side of a transformer |
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| Publication Number | Publication Date |
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| CN203191490U true CN203191490U (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220690005 Expired - Lifetime CN203191490U (en) | 2012-12-13 | 2012-12-13 | A phase failure detecting system of the high voltage side of a transformer |
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| Country | Link |
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| CN (1) | CN203191490U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105572535A (en) * | 2015-12-30 | 2016-05-11 | 北京天诚同创电气有限公司 | Monitoring method, monitoring device and monitoring system of step-up transformer |
| CN109217326A (en) * | 2017-07-03 | 2019-01-15 | 许继电气股份有限公司 | A kind of buck angle-style STATCOM and its control method |
-
2012
- 2012-12-13 CN CN 201220690005 patent/CN203191490U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105572535A (en) * | 2015-12-30 | 2016-05-11 | 北京天诚同创电气有限公司 | Monitoring method, monitoring device and monitoring system of step-up transformer |
| CN109217326A (en) * | 2017-07-03 | 2019-01-15 | 许继电气股份有限公司 | A kind of buck angle-style STATCOM and its control method |
| CN109217326B (en) * | 2017-07-03 | 2023-01-17 | 许继电气股份有限公司 | Step-down angular STATCOM and control method thereof |
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