CN101713803B - Portable resistor-type current phase shifter - Google Patents
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- CN101713803B CN101713803B CN2009102529786A CN200910252978A CN101713803B CN 101713803 B CN101713803 B CN 101713803B CN 2009102529786 A CN2009102529786 A CN 2009102529786A CN 200910252978 A CN200910252978 A CN 200910252978A CN 101713803 B CN101713803 B CN 101713803B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The invention relates to a portable resistor-type current phase shifter. Two fixed-point connectors of a sliding resistor are used to be connected between a first phase circuit and a second phase circuit of a three-phase electric network circuit; a sliding point connector of the sliding resistor is connected with a first end of a primary winding of a transformer; a second end of the primary winding of the transformer is connected with a zero wire of the three-phase electric network circuit; a first end of a secondary winding of the transformer is connected with a sampling current input end of a power factor meter in series through a load resistor and an ampere meter; a sampling current output end of the power factor meter is used for connecting a sampling current input end of an automatic power factor compensating product to be tested; a second end of the secondary winding of the transformer is used for connecting a sampling current output end of the automatic power factor compensating product to be tested; sampling voltage input ends of the power factor meter and the automatic power factor compensating product to be tested are used for connecting a third phase circuit of the three-phase electric network circuit; and zero wire connecting ends of the power factor meter and the automatic power factor compensating product to be tested are used for connecting the zero wire of the three-phase electric network circuit.
Description
Technical field
The present invention relates to power factor test unit technical field, relate in particular to a kind of portable resistor-type current phase shifter.
Background technology
At present; The auto power-factor compensating capacitor panel can keep certain level at power factor of electric network; Reach the purpose of saves energy; For the automatic switching function of the automatic compensation condenser cabinet of guaranteed output factor product, every product all need carry out the action test under different capacity factor situation before dispatching from the factory, be a most important pilot project in all tests.
Stipulate that in initial test program this auto power-factor compensating capacitor panel product will connect a corresponding asynchronous motor, through changing the variation that motor load realizes power factor.This method will be employed many testing equipments, and investment cost expensive (need a cover frequency conversion unit, starting device, pressure regulator, and take bigger place) consumes a large amount of energy time and the labour long with cost, can not adapt to the Workshop Production progress fully.
Condition forces us to find new outlets now, manages to adopt analogy method solve problem of equal value.Can know that from the principles of electric and electronic engineering cosine of angle is power factor between voltage and the electric current, so, can realize the power factor adjusting as long as can make the electric current phase shift.As everyone knows, when having inductance and electric capacity in the circuit, just can obtain phase lag or leading electric current; Present technology is to adopt an adjustable rheostat and variable inductor to form electric current phase shift regulating loop, uses through actual, can play the phase shift effect within the specific limits; Tentatively solved the difficulty on the product testing, still, along with being widely used of this impedance line; Expose again and still exist sizable defective, promptly the current waveform that distortion causes distortion takes place in the saturated current waveform that makes of telefault, influences test mass; To be lower than 0.9 distortion when following serious when power factor is adjusted to, and can not correctly simulate actual power factor of electric network, if still adopt the principle of impedance line; Just must manufacture and design special telefault; Volume and weight all will increase greatly, and moving and use all will be very inconvenient, lose the superiority of analog form.
Summary of the invention
The purpose of this invention is to provide a kind of portable resistor-type current phase shifter, be used to carry out the action test of auto power-factor compensating product under different capacity factor situation.
A kind of portable resistor-type current phase shifter; Wherein: comprise slide wire resistance, transformer, pull-up resistor, power factor meter; Wherein, Two fixed point joints of slide wire resistance are used to be connected between first phase, the second phase circuit of three phase network circuit; The sliding point joint of slide wire resistance connects first end of primary winding, and second end of primary winding connects the zero line of three phase network circuit, and first end of Secondary winding of transformer is through the sample rate current input end of pull-up resistor, reometer serial connection power factor meter; The sample rate current output terminal of power factor meter is used to connect the sample rate current input end of auto power-factor compensating product to be measured; Second end of Secondary winding of transformer is used to connect the sample rate current output terminal of auto power-factor compensating product to be measured, and the sampled voltage input end of power factor meter is used to connect the third phase circuit of three phase network circuit, and the zero line link of power factor meter is used to connect the zero line of three phase network circuit; The sampled voltage input end of auto power-factor compensating product to be measured is used to connect the third phase circuit of three phase network circuit, and the zero line link of auto power-factor compensating product to be measured is used to connect the zero line of three phase network circuit.
Described portable resistor-type current phase shifter; Wherein: two fixed point joints of slide wire resistance are used to be connected between the B phase, C phase circuit of three phase network circuit; The sliding point joint of slide wire resistance connects first end of primary winding; Second end of primary winding connects the zero line of three phase network circuit; First end of Secondary winding of transformer is through the sample rate current input end of pull-up resistor, reometer serial connection power factor meter; The sample rate current output terminal of power factor meter is used to connect the sample rate current input end of auto power-factor compensating product to be measured; Second end of Secondary winding of transformer is used to connect the sample rate current output terminal of auto power-factor compensating product to be measured, and the sampled voltage input end of power factor meter is used to connect the A phase circuit of three phase network circuit, and the zero line link of power factor meter is used to connect the zero line of three phase network circuit; The sampled voltage input end of auto power-factor compensating product to be measured is used to connect the A phase circuit of three phase network circuit, and the zero line link of auto power-factor compensating product to be measured is used to connect the zero line of three phase network circuit.
Described portable resistor-type current phase shifter; Wherein: two fixed point joints of slide wire resistance are used to be connected between the A phase, B phase circuit of three phase network circuit; The sliding point joint of slide wire resistance connects first end of primary winding; Second end of primary winding connects the zero line of three phase network circuit; First end of Secondary winding of transformer is through the sample rate current input end of pull-up resistor, reometer serial connection power factor meter; The sample rate current output terminal of power factor meter is used to connect the sample rate current input end of auto power-factor compensating product to be measured; Second end of Secondary winding of transformer is used to connect the sample rate current output terminal of auto power-factor compensating product to be measured, and the sampled voltage input end of power factor meter is used to connect the C phase circuit of three phase network circuit, and the zero line link of power factor meter is used to connect the zero line of three phase network circuit; The sampled voltage input end of auto power-factor compensating product to be measured is used to connect the C phase circuit of three phase network circuit, and the zero line link of auto power-factor compensating product to be measured is used to connect the zero line of three phase network circuit.
Described portable resistor-type current phase shifter; Wherein: two fixed point joints of slide wire resistance are used to be connected between the A phase, C phase circuit of three phase network circuit; The sliding point joint of slide wire resistance connects first end of primary winding; Second end of primary winding connects the zero line of three phase network circuit; First end of Secondary winding of transformer is through the sample rate current input end of pull-up resistor, reometer serial connection power factor meter; The sample rate current output terminal of power factor meter is used to connect the sample rate current input end of auto power-factor compensating product to be measured; Second end of Secondary winding of transformer is used to connect the sample rate current output terminal of auto power-factor compensating product to be measured, and the sampled voltage input end of power factor meter is used to connect the B phase circuit of three phase network circuit, and the zero line link of power factor meter is used to connect the zero line of three phase network circuit; The sampled voltage input end of auto power-factor compensating product to be measured is used to connect the B phase circuit of three phase network circuit, and the zero line link of auto power-factor compensating product to be measured is used to connect the zero line of three phase network circuit.
The present invention adopts technique scheme will reach following technique effect:
Portable resistor-type current phase shifter of the present invention; As: shown in Fig. 1 a; The B, C that two fixed point joints of slide wire resistance connect the three phase network circuit mutually between, the sliding point joint of slide wire resistance be connected on the zero line after the primary winding be connected in series, when the sliding point of slide wire resistance when the continuous contact of B moves on to the continuous contact of C; Primary winding voltage (being the sliding point voltage of slide wire resistance) UKN transforms to UC from UB; Can know that with reference to figure 1b polar plot transformer voltage UKN phase place has turned over 120 °, primary winding voltage UKN is through Secondary winding of transformer output current IKN; When the sliding point of slide wire resistance moves to C when linking to each other contact from the B contact that links to each other, the output current phase place of transformer secondary output winding is also corresponding to have turned over 120 °; With anti-phase of transformer secondary output winding output current IKN phase place and A phase voltage UA bit comparison mutually; Can find out just in time be with A phase voltage UA phase place be axis of symmetry rotated ± 60 °; Can know that from electrotechnics the angle between transformer secondary output winding output current IKN phase place and the A phase voltage UA phase place promptly is equivalent to power-factor angle, routine φ 1 and φ 2; So as long as change the sliding point position of slide wire resistance; Just can reach the purpose that changes power-factor angle, A phase voltage UA and transformer secondary output winding output current IKN are connected on respectively on the power factor meter (single-phase), make power factor meter reflect the power factor value of needs; The size of regulating load resistance may command output current.The power factor range of adjustment is 0.5 to leading 0.5 adjusting arbitrarily that lags behind; If the A, B that again slide wire resistance two fixed point joints are received the three phase network circuit respectively mutually between or A, C mutually between, transformer secondary output winding output current IKN phase place can reach the 360 ° of rotations generally of three kinds of situation.The saturated influence that the present technique scheme has been eliminated inductance component in the conventional power factor regulation technology fully and brought thus; Guaranteed adjustment accuracy; Can debug auto power-factor compensating product to be measured more accurately, help to improve the quality of auto power-factor compensating product to be measured.
Description of drawings
Fig. 1 a is first kind of johning knot composition of portable resistor-type current phase shifter of the present invention;
Fig. 1 b is the polar plot of portable resistor-type current phase shifter shown in Fig. 1 a;
Fig. 2 a is second kind of johning knot composition of portable resistor-type current phase shifter of the present invention;
Fig. 2 b is the polar plot of portable resistor-type current phase shifter shown in Fig. 2 a;
Fig. 3 a is the third johning knot composition of portable resistor-type current phase shifter of the present invention;
Fig. 3 b is the polar plot of portable resistor-type current phase shifter shown in Fig. 3 a.
Embodiment
A kind of portable resistor-type current phase shifter; Wherein: comprise slide wire resistance, transformer, pull-up resistor, power factor meter; Wherein, Two fixed point joints of slide wire resistance are used to be connected between first phase, the second phase circuit of three phase network circuit; The sliding point joint of slide wire resistance connects first end of primary winding, and second end of primary winding connects the zero line of three phase network circuit, and first end of Secondary winding of transformer is through the sample rate current input end of pull-up resistor, reometer serial connection power factor meter; The sample rate current output terminal of power factor meter is used to connect the sample rate current input end of auto power-factor compensating product to be measured; Second end of Secondary winding of transformer is used to connect the sample rate current output terminal of auto power-factor compensating product to be measured, and the sampled voltage input end of power factor meter is used to connect the third phase circuit of three phase network circuit, and the zero line link of power factor meter is used to connect the zero line of three phase network circuit; The sampled voltage input end of auto power-factor compensating product to be measured is used to connect the third phase circuit of three phase network circuit, and the zero line link of auto power-factor compensating product to be measured is used to connect the zero line of three phase network circuit.
Fig. 1 a is first kind of johning knot composition of portable resistor-type current phase shifter of the present invention; The two fixed point joints of slide wire resistance R are used to be connected between the B phase, C phase circuit of three phase network circuit; The joint of the sliding point K of slide wire resistance R connects first end of the elementary winding of transformer T; Second end of the elementary winding of transformer T connects the zero line N of three phase network circuit; The sample rate current input end that first end serial connection pull-up resistor r of transformer T secondary winding, reometer 1 back connect power factor meter 2; The sample rate current output terminal of power factor meter 2 connects the sample rate current input end of auto power-factor compensating product 3 to be measured, and second end of transformer T secondary winding connects the sample rate current output terminal of auto power-factor compensating product 3 to be measured; Corresponding respectively A phase circuit, the zero line N that connects the three phase network circuit of the sampled voltage input end of power factor meter 2, zero line N joint; Corresponding respectively A phase circuit, the zero line N that connects the three phase network circuit of the sampled voltage input end of auto power-factor compensating product 3 to be measured, zero line N joint.
Can know that from Fig. 1 a the sliding point K of slide wire resistance R moves on to C when linking to each other contact from the B contact that links to each other, the elementary winding voltage of transformer T UKN transforms to UC from UB, can know from polar plot 1b, and the elementary winding voltage of transformer T UKN voltage-phase has turned over 120 °.The elementary winding voltage of transformer T UKN is through output current IKN behind the transformer T secondary winding, and when sliding point K moves to C when linking to each other contact from the B contact that links to each other, the phase place of output current IKN is also corresponding to have turned over 120 °.With the mutually bit comparison of transformer T secondary winding output current IKN phase place anti-phase with A phase voltage UA, can find out just in time be with A phase voltage UA phase place be axis of symmetry rotated ± 60 °.Can know from electrotechnics; Angle between the phase place of transformer secondary output winding output current IKN and the A phase voltage UA phase place promptly is equivalent to power-factor angle; For example φ 1 and φ 2 so need only the position that changes slide wire resistance R sliding point K, just can reach the purpose that changes power-factor angle; A phase voltage UA and transformer secondary output winding output current IKN are connected on respectively on the power factor meter (single-phase), make power factor meter reflect the power factor value of needs; The size of regulating load resistance r may command output current.The power factor range of adjustment is 0.5 to leading 0.5 adjusting arbitrarily that lags behind.
Fig. 2 a is second kind of johning knot composition of portable resistor-type current phase shifter of the present invention; The two fixed point joints of slide wire resistance R are used to be connected between the A phase, B phase circuit of three phase network circuit; The joint of the sliding point K of slide wire resistance R connects first end of the elementary winding of transformer T; Second end of the elementary winding of transformer T connects the zero line N of three phase network circuit; The sample rate current input end that first end serial connection pull-up resistor r of transformer T secondary winding, reometer 1 back connect power factor meter 2; The sample rate current output terminal of power factor meter 2 connects the sample rate current input end of auto power-factor compensating product 3 to be measured, and second end of transformer T secondary winding connects the sample rate current output terminal of auto power-factor compensating product 3 to be measured; Corresponding respectively C phase circuit, the zero line N that connects the three phase network circuit of the sampled voltage input end of power factor meter 2, zero line N joint; Corresponding respectively C phase circuit, the zero line N that connects the three phase network circuit of the sampled voltage input end of auto power-factor compensating product 3 to be measured, zero line N joint.
Can know that from Fig. 2 a the sliding point K of slide wire resistance R moves on to B when linking to each other contact from the A contact that links to each other, the elementary winding voltage of transformer T UKN transforms to UB from UA, can know from polar plot 2b, and the elementary winding voltage of transformer T UKN voltage-phase has turned over 120 °.The elementary winding voltage of transformer T UKN is through output current IKN behind the transformer T secondary winding; When sliding point K moves to B when linking to each other contact from the A contact that links to each other; The phase place of output current IKN is also corresponding to have turned over 120 °; With anti-phase of transformer T secondary winding output current IKN phase place and C phase voltage UC bit comparison mutually, can find out just in time be with C phase voltage UC phase place be axis of symmetry rotated ± 60 °.Can know from electrotechnics; Angle between transformer secondary output winding output current IKN phase place and the C phase voltage UC phase place promptly is equivalent to power-factor angle; For example φ 1 and φ 2 so need only the position that changes slide wire resistance R sliding point K, just can reach the purpose that changes power-factor angle; C phase voltage UC and transformer secondary output winding output current IKN are connected on respectively on the power factor meter (single-phase), make power factor meter reflect the power factor value of needs; The size of regulating load resistance r may command output current.The power factor range of adjustment is 0.5 to leading 0.5 adjusting arbitrarily that lags behind.
Fig. 3 a is portable resistor-type current phase shifter of the present invention the third johning knot composition in the three phase network circuit; The two fixed point joints of slide wire resistance R are used to be connected between the A phase, C phase circuit of three phase network circuit; The joint of the sliding point K of slide wire resistance R connects first end of the elementary winding of transformer T; Second end of the elementary winding of transformer T connects the zero line N of three phase network circuit; The sample rate current input end that first end serial connection pull-up resistor r of transformer T secondary winding, reometer 1 back connect power factor meter 2; The sample rate current output terminal of power factor meter 2 connects the sample rate current input end of auto power-factor compensating product 3 to be measured, and second end of transformer T secondary winding connects the sample rate current output terminal of auto power-factor compensating product 3 to be measured; Corresponding respectively B phase circuit, the zero line N that connects the three phase network circuit of the sampled voltage input end of power factor meter 2, zero line N joint; Corresponding respectively B phase circuit, the zero line N that connects the three phase network circuit of the sampled voltage input end of auto power-factor compensating product 3 to be measured, zero line N joint.
Can know that from Fig. 3 a the sliding point K of slide wire resistance R moves on to C when linking to each other contact from the A contact that links to each other, the elementary winding voltage of transformer T UKN transforms to UC from UA, can know from polar plot 3b, and the elementary winding voltage of transformer T UKN voltage-phase has turned over 120 °.The elementary winding voltage of transformer T UKN is through output current IKN behind the transformer T secondary winding; When sliding point K moves to C when linking to each other contact from the A contact that links to each other; Output current is also corresponding to have turned over 120 °; With anti-phase of transformer T secondary winding output current IKN phase place and B phase voltage UB bit comparison mutually, can find out just in time be with B phase voltage UB phase place be axis of symmetry rotated ± 60 °.Can know from electrotechnics; Angle between transformer secondary output winding output current IKN phase place and the B phase voltage UB phase place promptly is equivalent to power-factor angle; For example φ 1 and φ 2 so need only the position that changes slide wire resistance R sliding point K, just can reach the purpose that changes power-factor angle; B phase voltage UB and transformer secondary output winding output current IKN are connected on respectively on the power factor meter (single-phase), make power factor meter reflect the power factor value of needs; The size of regulating load resistance r may command output current.The power factor range of adjustment is 0.5 to leading 0.5 adjusting arbitrarily that lags behind.
In sum; Portable resistor-type current phase shifter provided by the invention; Have that circuit is simple, volume is little, in light weight, easy to use, characteristics that phase shift range is wide, in concrete the use, the saturated influence that it has been eliminated inductance component fully and has brought thus; Can debug auto power-factor compensating product 3 to be measured more accurately, help to improve the quality of auto power-factor compensating product 3 to be measured.
Claims (4)
1. portable resistor-type current phase shifter; It is characterized in that: comprise slide wire resistance, transformer, pull-up resistor, power factor meter; Wherein, Two fixed point joints of slide wire resistance are used to be connected between first phase, the second phase circuit of three phase network circuit; The sliding point joint of slide wire resistance connects first end of primary winding, and second end of primary winding connects the zero line of three phase network circuit, and first end of Secondary winding of transformer is through the sample rate current input end of pull-up resistor, reometer serial connection power factor meter; The sample rate current output terminal of power factor meter is used to connect the sample rate current input end of auto power-factor compensating product to be measured; Second end of Secondary winding of transformer is used to connect the sample rate current output terminal of auto power-factor compensating product to be measured, and the sampled voltage input end of power factor meter is used to connect the third phase circuit of three phase network circuit, and the zero line link of power factor meter is used to connect the zero line of three phase network circuit; The sampled voltage input end of auto power-factor compensating product to be measured is used to connect the third phase circuit of three phase network circuit, and the zero line link of auto power-factor compensating product to be measured is used to connect the zero line of three phase network circuit.
2. portable resistor-type current phase shifter as claimed in claim 1; It is characterized in that: two fixed point joints of slide wire resistance are used to be connected between the B phase, C phase circuit of three phase network circuit; The sliding point joint of slide wire resistance connects first end of primary winding; Second end of primary winding connects the zero line of three phase network circuit; First end of Secondary winding of transformer is through the sample rate current input end of pull-up resistor, reometer serial connection power factor meter; The sample rate current output terminal of power factor meter is used to connect the sample rate current input end of auto power-factor compensating product to be measured; Second end of Secondary winding of transformer is used to connect the sample rate current output terminal of auto power-factor compensating product to be measured, and the sampled voltage input end of power factor meter is used to connect the A phase circuit of three phase network circuit, and the zero line link of power factor meter is used to connect the zero line of three phase network circuit; The sampled voltage input end of auto power-factor compensating product to be measured is used to connect the A phase circuit of three phase network circuit, and the zero line link of auto power-factor compensating product to be measured is used to connect the zero line of three phase network circuit.
3. portable resistor-type current phase shifter as claimed in claim 1; It is characterized in that: two fixed point joints of slide wire resistance are used to be connected between the A phase, B phase circuit of three phase network circuit; The sliding point joint of slide wire resistance connects first end of primary winding; Second end of primary winding connects the zero line of three phase network circuit; First end of Secondary winding of transformer is through the sample rate current input end of pull-up resistor, reometer serial connection power factor meter; The sample rate current output terminal of power factor meter is used to connect the sample rate current input end of auto power-factor compensating product to be measured; Second end of Secondary winding of transformer is used to connect the sample rate current output terminal of auto power-factor compensating product to be measured, and the sampled voltage input end of power factor meter is used to connect the C phase circuit of three phase network circuit, and the zero line link of power factor meter is used to connect the zero line of three phase network circuit; The sampled voltage input end of auto power-factor compensating product to be measured is used to connect the C phase circuit of three phase network circuit, and the zero line link of auto power-factor compensating product to be measured is used to connect the zero line of three phase network circuit.
4. portable resistor-type current phase shifter as claimed in claim 1; It is characterized in that: two fixed point joints of slide wire resistance are used to be connected between the A phase, C phase circuit of three phase network circuit; The sliding point joint of slide wire resistance connects first end of primary winding; Second end of primary winding connects the zero line of three phase network circuit; First end of Secondary winding of transformer is through the sample rate current input end of pull-up resistor, reometer serial connection power factor meter; The sample rate current output terminal of power factor meter is used to connect the sample rate current input end of auto power-factor compensating product to be measured; Second end of Secondary winding of transformer is used to connect the sample rate current output terminal of auto power-factor compensating product to be measured, and the sampled voltage input end of power factor meter is used to connect the B phase circuit of three phase network circuit, and the zero line link of power factor meter is used to connect the zero line of three phase network circuit; The sampled voltage input end of auto power-factor compensating product to be measured is used to connect the B phase circuit of three phase network circuit, and the zero line link of auto power-factor compensating product to be measured is used to connect the zero line of three phase network circuit.
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| CN2009102529786A CN101713803B (en) | 2009-12-07 | 2009-12-07 | Portable resistor-type current phase shifter |
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| CN2009102529786A CN101713803B (en) | 2009-12-07 | 2009-12-07 | Portable resistor-type current phase shifter |
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| CN101713803B true CN101713803B (en) | 2012-05-23 |
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| CN102437583A (en) * | 2011-12-30 | 2012-05-02 | 烟台市华能电器有限公司 | Analogue phase-shift current generator |
| CN105834518B (en) * | 2016-05-19 | 2018-02-16 | 江苏超峰工具有限公司 | High intensity continuous tooth diamond saw blade hot press forming technology |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB334644A (en) * | 1929-06-22 | 1930-09-11 | Donald Arthur Oliver | Improvements in or relating to alternating current phase splitting systems |
| CN101482587A (en) * | 2008-11-28 | 2009-07-15 | 王万俊 | Switching detector of reactive compensator |
| CN201555868U (en) * | 2009-12-07 | 2010-08-18 | 河南省电力公司许昌供电公司 | Portable resistance type current phase shifter |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB334644A (en) * | 1929-06-22 | 1930-09-11 | Donald Arthur Oliver | Improvements in or relating to alternating current phase splitting systems |
| CN101482587A (en) * | 2008-11-28 | 2009-07-15 | 王万俊 | Switching detector of reactive compensator |
| CN201555868U (en) * | 2009-12-07 | 2010-08-18 | 河南省电力公司许昌供电公司 | Portable resistance type current phase shifter |
Non-Patent Citations (2)
| Title |
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| 施大申.满足IEC插头、插座试验要求的可调负载箱.《环境技术》.1997,(第2期),第42-44页. * |
| 魏永霞.简易移相装置.《安装》.2002,第30、40页. * |
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