CN102944762B - Debugging method of phase sequences of loops at two sides of synchronization point before commissioning of generator set - Google Patents
Debugging method of phase sequences of loops at two sides of synchronization point before commissioning of generator set Download PDFInfo
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Abstract
The invention discloses a debugging method of phase sequences of loops at two sides of a synchronization point before commissioning of a generator set. Before first synchronization grid connection of the generator set, the corresponding relation between primary phase sequences and secondary phase sequences at the two sides of the synchronization point, the primary phase sequence at the two sides of the synchronization point and the secondary phase sequences at the two sides of the synchronization point are detected and debugged by a protector debugging instrument, a phase sequence meter and a universal meter under a 380-V low-voltage power supply, a power-grid-side high-voltage power supply or a generator self-generating electricity accessing state. According to the debugging method of the phase sequences of the loops at the two sides of the synchronization point before the commissioning of the generator set, the phase sequences on a synchronization voltage miniature bus can be guaranteed to be real reflection of primary loops, the phase sequences of the primary loops at the two sides of the synchronization point and secondary voltage comparison loops are adjusted to be coincident in an unmistakable manner, the serious injury brought by non-synchronization grid connection caused by different phase sequences is avoided; and the condition that the grid connection cannot be carried out because the phase sequences are detected to be inconsistent after the impulse starting of the generator is avoided, and the accuracy, reliability and safety of the grid connection of the generator set are guaranteed.
Description
Technical field
The present invention relates to the adjustment method before a kind of genset puts into operation, particularly genset put into operation before the same period put two side loop phase sequence adjustment methods.
Background technology
The genset newly putting into operation, the grid-connected front primary circuit phase sequence that must guarantee to put the same period both sides is identical first, voltage swing equates, frequency is identical, voltage-phase angular difference is no more than 20 °, just can carry out and net operation.The synchronous voltage of putting both sides the same period is the alternating voltage after voltage transformer (VT) (PT) conversion and secondary circuit switching, guides on the little bus of corresponding synchronous voltage.Before carrying out simultaneous interconnecting operation, first to carry out phase sequence detection to putting the voltage signal of the little bus of synchronous voltage of both sides the same period, object is whether consistent for verification if putting the primary circuit phase sequence of both sides the same period, just can carry out simultaneous interconnecting operation while only having the phase sequence of the two identical.If phase sequence is different,, when carrying out simultaneous interconnecting operation, same-phase cannot be detected, with the voltage signal of amplitude, cannot examine the same period, also just cannot be grid-connected.As asynchronous parallelizing in the situation that phase sequence is different can cause huge impact to generator and electrical network, relevant protection can be moved and off-the-line, even causes generator to damage or mains breakdown.
The method that phase sequence detects is at present with phase-sequence meter, to carry out phase sequence detection respectively on generating pusher side and the little bus of grid side synchronous voltage.If the two testing result phase sequence is identical, think that the phase sequence of primary circuit is also identical, can further detect put the same period voltage, frequency, voltage phase angle of both sides consistent after, carry out simultaneous interconnecting operation.The method that this phase sequence detects is Shortcomings and defect, because the method that this phase sequence detects is not the direct measurement to primary circuit, but phase sequence by the little bus of secondary synchronous voltage detects to react phase sequence, and once whether corresponding one by one with secondary, can not determine.For example, primary circuit phase sequence is if A, B, C and whether the phase sequence of guiding on the little bus of synchronous voltage after voltage transformer (VT) conversion is exactly still A, B, C, and can not become B, A, C, cannot determine.
High-voltage board is middle-placed switch cabinet now, voltage transformer (VT) is in the dolly being contained on middle-placed switch cabinet, voltage secondary circuit is to guide on the terminal row of high-voltage board by dolly aviation plug, then by cable, is guided on the little bus of synchronous voltage of the screen same period, then accesses synchronous voltage comparison loop.Although can carry out verification and the accuracy checking of voltage circuit in electrical construction and during protective debugging; but voltage circuit is through repeatedly transferring and the aspect factor such as construction, tester's quality, be difficult to guarantee that the phase sequence result that detects is exactly the true reflection of primary circuit on the same period little bus.While often carrying out sequence examing after generator reaches rated speed, can there is to put the same period the inconsistent situation of both sides sequence examing result, at this moment need generator to exit excitation stall, and grid side lead-in circuit breaker is divided and had no progeny, first and second loop, both sides is checked, and genset raising speed to reach rated speed be to have strict climb curve, therefore from start, reaching rated speed needs several hours, can not timely grid-connected meeting causes the huge waste of human and material resources and the energy.Even if the result at sequence examing is first consistent, also exist because of above-mentioned reason generation asynchronous parallelizing may, reliability and the security of therefore according to said method carrying out phase sequence detection are not high.Therefore how to carry out effective first and second loop sequence examing, guarantee when grid-connected to be that real simultaneous interconnecting is exactly technical matters to be solved by this invention.
Summary of the invention
Technical matters to be solved by this invention is, for the defect of current phase sequence detecting method and the potential safety hazard of existence, provide a kind of and at genset, the phase sequence of putting both sides one or two times the same period is calibrated for accurately before simultaneous interconnecting first to consistent phase sequence detects, adjustment method.
For above-mentioned technical matters; the present invention proposes following technical scheme; before genset puts into operation, put two side loop phase sequence adjustment methods the same period; it is characterized in that; at genset first before simultaneous interconnecting; utilize protective device debugging instrument, phase-sequence meter, multimeter; when 380V low-tension supply, grid side high-voltage power supply or generator self power generation access state; to put both sides the same period once and put secondary phase order corresponding relation, the same period both sides once between phase sequence, put phase sequence between the secondary of both sides and detect and debug the same period, concrete operation steps is as follows:
1) after having constructed in generator first and second loop, by genset outgoing cable and the disjunction of genset lead-in circuit breaker, make grid side lead-in circuit breaker also in disjunction state simultaneously, and by the same period point breaker to close be that grid-connection cabinet isolating switch closes;
2) voltage transformer (VT) of grid side, generating pusher side is put into working position or the isolating switch that closes, the insurance of each voltage transformer secondary extension line is exited or miniature circuit breaker disjunction, voltage signal and outside secondary voltage circuit are disconnected;
3) 380V low-tension supply is arbitrary mutually respectively with in main bus-bar A, B, C three-phase, certain overlaps mutually, make to only have one to pass to mutually 380V low-tension supply in main bus-bar three-phase, then the voltage transformer secondary side of grid side, generating pusher side is measured with multimeter, to detect, each Secondary Circuit of Potential Transformer causes insurance or whether wiring is normal at miniature circuit breaker place;
4) insurance input or the miniature circuit breaker of each voltage transformer secondary extension line are closed, the voltage signal of each voltage transformer (VT) is passed out to each voltage circuit; Then at each screen voltage detecting point cashier's office in a shop, measure and result and the voltage demonstration cashier's office in a shop of each screen are compared, correct to determine the equal wiring of each voltage circuit;
5) three-phase 380V is accessed to three-phase major loop together, at the voltage detecting point of each voltage transformer (VT), with multimeter, carry out phase voltage, line voltage measurement, and the voltage of measurement result and each voltage table meter and protection loop and synchronous loop is shown and compared; Simultaneously in synchronous voltage comparison loop, to putting the secondary voltage signal of both sides the same period, intersect measurement;
6) the simultaneous interconnecting cabinet breaker that closes, grid side high-tension electricity is sent into and put two side bus the same period, voltage detecting point at grid side voltage transformer (VT) is measured with multimeter, and the voltage of measurement result and each voltage table meter and protective device is shown to the check of comparing, and formal electrical network phase sequence under survey record;
7) when generator carries out no-load characteristic test by the disjunction of grid side lead-in circuit breaker, close and put grid-connection cabinet isolating switch the same period, with the power supply of generating pusher side, will put both sides bus the same period takes up, voltage detecting point at voltage transformer (VT) is measured with multimeter, and the voltage of measurement result and each voltage table meter and protective device is shown and compared;
8) before formal simultaneous interconnecting, be grid side power supply, generator reaches to turn to rise to encourage to cause after rated voltage to be delivered to respectively and puts the same period on two side bus, put grid-connection cabinet isolating switch the same period in disjunction state, after each voltage transformer (VT) is in running order, again the voltage detecting point of each voltage transformer (VT) is checked, measure, comparison, and with phase-sequence meter, each voltage detecting point is measured, to putting the secondary voltage signal of both sides the same period, intersect measurement, the voltage signal phase sequence of putting both sides the same period is consistent, particularly voltage comparison loop be the phase sequence of synchronous loop consistent after, the point breaker same period closes, grid-connected.
The invention has the beneficial effects as follows, can guarantee that the phase sequence on the little bus of synchronous voltage is the true reflection of primary circuit, and make to put the primary circuit of both sides the same period and the phase sequence of secondary voltage comparison loop is calibrated for unanimously accurately, stopped because of the different serious harms that cause asynchronous parallelizing to bring of phase sequence; Avoided after generator red switch because of sequence examing is inconsistent cannot be grid-connected, and carried out the human and material resources that phase sequence check caused, the massive losses of the energy by forced-stopping machine, can guarantee the grid-connected accuracy of genset, reliability and security.
Accompanying drawing explanation
Fig. 1 is primary circuit, genset simultaneous interconnecting point both sides schematic diagram.
Fig. 2 is the schematic diagram that secondary voltage circuit a phase is connected and makes a mistake with b.
Fig. 3 is that primary circuit is to put both sides main bus-bar copper bar the same period paraphase schematic diagram has occurred when mounted.
In figure: 1, genset, 2, generating pusher side bus, 3, bus of grid side, 4, isolating switch.5, electrical network; 6, voltage transformer (VT).
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.Referring to Fig. 1 to Fig. 3; before genset puts into operation, put two side loop phase sequence adjustment methods the same period; it is characterized in that; at genset 1 first before simultaneous interconnecting; utilize protective device debugging instrument, phase-sequence meter, multimeter; when 380V low-tension supply, grid side high-voltage power supply or generator self power generation access state, to put both sides the same period once and put secondary phase order corresponding relation, the same period both sides once between phase sequence, put phase sequence between the secondary of both sides and detect and debug the same period, concrete operation steps is as follows:
1) after having constructed in generator first and second loop, genset 1 outgoing cable is not first connected with high-voltage board generating pusher side lead-in pile head, should be by isolating switch 4 disjunctions if any generator lead-in circuit breaker 4, make grid side lead-in circuit breaker 4 also in disjunction state simultaneously, and by the same period point breaker 4 to close be that grid-connection cabinet isolating switch 4 closes.The object of this way be by and both sides, site bus by grid-connection cabinet isolating switch 4, be connected, form a bus communicating completely and break completely with electrical network 5, genset 1, so that the carrying out of further work.See Fig. 1;
2) voltage transformer (VT) 6 of grid side, generating pusher side is put into working position or the isolating switch that closes, make voltage transformer (VT) 6 in running order, the insurance of 6 two extension lines of each voltage transformer (VT) is exited or miniature circuit breaker disjunction simultaneously, voltage signal and outside secondary voltage circuit are disconnected;
3) 380V low-tension supply is arbitrary mutually respectively with in main bus-bar A, B, C three-phase, certain overlaps mutually, make to only have one to pass to mutually 380V low-tension supply in main bus-bar three-phase, then voltage transformer (VT) 6 secondary sides of grid side, generating pusher side are measured with multimeter, to detect, each voltage transformer (VT) 6 secondary circuits cause insurance or whether wiring is normal at miniature circuit breaker place.The A of take is example mutually, supposes that voltage transformer (VT) 6 no-load voltage ratios are 10000/100/
; After 380V power supply is connected with A phase bus, the voltage measuring value at the relative neutral point of voltage transformer (VT) 6 secondary side A is 2.2V so, and B, C two-phase are not connected therefore no-voltage with 380V power supply.As measurement result, correctly to represent that voltage transformer (VT) 6 secondary sides are connected to the circuit connection of isolating switch 4 or insurance correct, otherwise represents wrong existence, needs to check and fix a breakdown;
4) insurance input or the miniature circuit breaker of 6 two extension lines of each voltage transformer (VT) are closed, the voltage signal of each voltage transformer (VT) 6 is passed out to each voltage circuit.If protection (protection screen), voltage ratio are compared with voltage circuits such as (the screen same period), excitation (excitation screen), measurements (signal screen); then at each screen voltage detecting point cashier's office in a shop, with multimeter, measure and result and the voltage demonstration cashier's office in a shop of each screen are compared, correct to determine the equal wiring of each voltage circuit.Guarantee that each voltage circuit all can correctly reflect voltage signal and the phase sequence of primary circuit.Before or after carrying out above-mentioned steps, with protective device debugging instrument, in voltage transformer (VT) 6 voltage secondary exits, add an analog voltage signal core school is carried out in precision and the loop of the voltage signals such as each voltage table meter, protective device;
5) three-phase 380V is accessed to three-phase major loop together, at the voltage detecting point of each voltage transformer (VT) 6, with multimeter, carry out phase voltage, line voltage measurement, and the voltage of measurement result and each voltage table meter and protection loop and synchronous loop is shown and compared; Simultaneously in synchronous voltage comparison loop, to putting the secondary voltage signal of both sides the same period, intersect measurement, measure electrical network survey A relatively generate electricity pusher side A mutually between voltage, electrical network survey relatively generate electricity pusher side B phase voltage, electrical network of B and survey the C pusher side C phase voltage of relatively generating electricity, because of what put both sides access the same period, be same voltage signal, so measurement result is zero without pressure reduction.And electrical network survey A relatively generate electricity pusher side B mutually between voltage be line voltage 3.8V, other are also like this.After completing above-mentioned work, with phase-sequence meter, each voltage detecting point (containing primary circuit) is measured, owing to being same power supply, so phase-sequence meter shows all identical.The object of carrying out this step is to check that each voltage returns whether the phase sequence comprising on the little bus of synchronous voltage is the true reflection of primary circuit, puts the primary circuit of both sides the same period and whether the phase sequence of secondary voltage comparison loop (in the situation that not accessing electrical network and generator) is identical.In said process, if any deviation, show that circuit connection exists mistake, should ascertain the reason and fix a breakdown immediately;
6) genset 1 outgoing cable be not still connected with high-voltage board generating pusher side lead-in pile head or service entrance switch still in disjunction state, simultaneous interconnecting cabinet breaker 4 closes, grid side high-tension electricity is sent into and put two side bus the same period, voltage detecting point at grid side voltage transformer (VT) 6 is measured with multimeter, and the voltage of measurement result and each voltage table meter and protective device is shown to the check of comparing, in synchronous voltage comparison loop, to putting the secondary voltage signal of both sides the same period, intersect measurement, after confirmation is errorless, with phase-sequence meter, each voltage detecting point is measured, owing to being same power supply, therefore phase-sequence meter shows all identical, and by sequence examing result in detail record and with early stage measurement result compare.The object of this step is the 380V brownout that prevents access in early stage, likely inaccurate or some the voltage measurement table meter of measurement result cannot normally show and cannot compare because range is excessive, therefore access after electric network source again to early stage testing result check, and formal electrical network phase sequence under survey record;
7) when generator carries out no-load characteristic test by 4 disjunctions of grid side lead-in circuit breaker, close and put grid-connection cabinet isolating switch 4 same period, with the power supply of generating pusher side, will put both sides bus the same period takes up, voltage detecting point at voltage transformer (VT) 6 is measured with multimeter, and the voltage of measurement result and each voltage table meter and protective device is shown and compared; In synchronous voltage comparison loop, to putting the secondary voltage signal of both sides the same period, intersect measurement, after confirmation is errorless, with phase-sequence meter, each voltage detecting point is measured, owing to being same power supply, therefore phase-sequence meter show all identical, and by sequence examing result record comparing with the measurement result that grid side power supply takes up while putting two side bus the same period in detail.Whether the object of this step is trial inspection grid side phase sequence consistent with generating pusher side phase sequence, and prevents that before generating red switch first and second loop is because of construction or other factors generation mistake that changes;
8) before formal simultaneous interconnecting, be grid side power supply, generator reaches to turn to rise to encourage to cause after rated voltage to be delivered to respectively and puts the same period on two side bus, put grid-connection cabinet isolating switch the same period in disjunction state, after each voltage transformer (VT) is in running order, again the voltage detecting point of each voltage transformer (VT) is checked, measure, comparison, and with phase-sequence meter, each voltage detecting point is measured, to putting the secondary voltage signal of both sides the same period, intersect measurement, measure grid side A relatively generate electricity pusher side A mutually between voltage, the grid side B pusher side B phase voltage of relatively generating electricity, the grid side C pusher side C phase voltage of relatively generating electricity.After phase sequence that the consistent particularly voltage comparison loop of voltage signal phase sequence of putting both sides the same period is synchronous loop is consistent, can carry out and net operation.
embodiment 1:as shown in Figure 2, when secondary voltage signal circuit, when being caused insurance or miniature circuit breaker (1FU 2FU 3FU) by voltage transformer (VT) 6 (1PT), mistake has occurred, in aforementioned concrete implementation step 3) time just can find mistake.If A accesses 380V power supply mutually, and make a mistake in voltage transformer (VT) 6 secondary side wiring, be that b has received mutually a and goes up mutually, when measuring with multimeter, the relative neutral point n of a voltage is zero, and the relative n voltage of b is 2.2V, this is just inconsistent with primary circuit.Therefore adopt the inventive method can accurately check out this type of mistake, and can check to make mistake where specifically occur in.
embodiment 2:as shown in Figure 3, when primary circuit is to put both sides main bus-bar copper bar the same period paraphase has occurred when mounted, in the concrete implementation step 4 of the inventive method) can find mistake.When a bus, at generator side bus, paraphase has occurred, and secondary side wiring is normal, when a bus being carried out to voltage measurement with multimeter, at the normal A of grid side voltage measurement, be relatively 220V, B phase, C are relatively zero, generating pusher side B ' phase-to-ground voltage be that 220V and A ' phase, C ' phase-to-ground voltage are zero.After dropping into voltage transformer (VT) 6, normal to voltage measuring value when grid side voltage transformer (VT) 6 secondary sides are measured, the relative neutral point n of a voltage is that 2.2V and b phase, the relative n voltage of c are zero, generating pusher side voltage transformer (VT) 6 secondary side measurement results are that a phase, the relative neutral point n of c voltage are zero and the relative n voltage of b is 2.2V, can accurately find wrong place and character like this.
embodiment 3:when genset 1 extension line is during to genset 1 incoming line cabinet generation paraphase, in the concrete implementation step of the inventive method, can detect when step 5), step 6).Once generating pusher side inlet wire cable generation paraphase, at generator, reach to move on to encourage and boost to after rated voltage, the measured phase sequence of generating pusher side from before this phase sequence of surveying different, by step 7 in concrete implementation step), step 8) can accurately detect.
The present invention can guarantee that the phase sequence on the little bus of synchronous voltage is the true reflection of primary circuit, and makes to put the primary circuit of both sides the same period and the phase sequence of secondary voltage comparison loop is calibrated for unanimously accurately.
Claims (1)
- Genset put into operation before the same period put two side loop phase sequence adjustment methods; it is characterized in that; at genset first before simultaneous interconnecting; utilize protective device debugging instrument, phase-sequence meter, multimeter; when 380V low-tension supply, grid side high-voltage power supply or generator self power generation access state; to put both sides the same period once and put secondary phase order corresponding relation, the same period both sides once between phase sequence, put phase sequence between the secondary of both sides and detect and debug the same period, concrete operation steps is as follows:1) after having constructed in generator first and second loop, by genset outgoing cable and the disjunction of genset lead-in circuit breaker, make grid side lead-in circuit breaker also in disjunction state simultaneously, and by the same period point breaker to close be that grid-connection cabinet isolating switch closes;2) voltage transformer (VT) of grid side, generating pusher side is put into working position or the isolating switch that closes, the insurance of each voltage transformer secondary extension line is exited or miniature circuit breaker disjunction, voltage signal and outside secondary voltage circuit are disconnected;3) 380V low-tension supply is arbitrary mutually respectively with in main bus-bar A, B, C three-phase, certain overlaps mutually, make to only have one to pass to mutually 380V low-tension supply in main bus-bar three-phase, then the voltage transformer secondary side of grid side, generating pusher side is measured with multimeter, to detect, each Secondary Circuit of Potential Transformer causes insurance or whether wiring is normal at miniature circuit breaker place;4) insurance input or the miniature circuit breaker of each voltage transformer secondary extension line are closed, the voltage signal of each voltage transformer (VT) is passed out to each voltage circuit; Then at each screen voltage detecting point cashier's office in a shop, measure and result and the voltage demonstration cashier's office in a shop of each screen are compared, correct to determine the equal wiring of each voltage circuit;5) three-phase 380V is accessed to three-phase major loop together, at the voltage detecting point of each voltage transformer (VT), with multimeter, carry out phase voltage, line voltage measurement, and the voltage of measurement result and each voltage table meter and protection loop and synchronous loop is shown and compared; Simultaneously in synchronous voltage comparison loop, to putting the secondary voltage signal of both sides the same period, intersect measurement;6) the simultaneous interconnecting cabinet breaker that closes, grid side high-tension electricity is sent into and put two side bus the same period, voltage detecting point at grid side voltage transformer (VT) is measured with multimeter, and the voltage of measurement result and each voltage table meter and protective device is shown to the check of comparing, and formal electrical network phase sequence under survey record;7) when generator carries out no-load characteristic test by the disjunction of grid side lead-in circuit breaker, close and put grid-connection cabinet isolating switch the same period, with the power supply of generating pusher side, will put both sides bus the same period takes up, voltage detecting point at voltage transformer (VT) is measured with multimeter, and the voltage of measurement result and each voltage table meter and protective device is shown and compared;8) before formal simultaneous interconnecting, be grid side power supply, generator reaches to turn to rise to encourage to be put on two side bus to delivering to respectively after rated voltage the same period, put grid-connection cabinet isolating switch the same period in disjunction state, after each voltage transformer (VT) is in running order, again the voltage detecting point of each voltage transformer (VT) is checked, measure, comparison, and with phase-sequence meter, each voltage detecting point is measured, to putting the secondary voltage signal of both sides the same period, intersect measurement, the voltage signal phase sequence of putting both sides the same period is consistent, particularly voltage comparison loop be the phase sequence of synchronous loop consistent after, the point breaker same period closes, grid-connected.
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| CN105445609A (en) * | 2015-12-01 | 2016-03-30 | 国网河南宜阳县供电公司 | Testing device and method for high voltage supply system loop |
| CN109932601A (en) * | 2019-03-31 | 2019-06-25 | 上海二十冶建设有限公司 | The method that the grid-connected circuit of star-like statodyne group is detected with anti-power transmission |
| CN110514911B (en) * | 2019-08-28 | 2021-08-24 | 西安热工研究院有限公司 | System and method for generating power plant high-voltage bus power supply phase checking |
| CN113162040B (en) * | 2021-04-29 | 2023-06-20 | 西安热工研究院有限公司 | System and method for power supply non-voltage nuclear phase for high-voltage plant of power plant |
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| CN201388065Y (en) * | 2008-12-05 | 2010-01-20 | 哈尔滨瑞雷电气科技发展有限责任公司 | Quasi-synchronization device applying software and hardware frequency measuring and phase measuring combined technology |
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