BYSB Series AC-DC high voltage test transformer manual
I. Product Overview
BYSB series light AC and DC high voltage test transformer is in similar products YDJ ( G ) high-voltage test transformer, based on the test transformer according to national standardsZBK41006 - 89 requirements, the improved production of a new product, the product has a small , light weight, compact, full-featured, easy to use and so on. Practical in electricity, mining, research and other departments, a variety of high-voltage electrical equipment, electrical components, insulation material frequency voltage withstand test and DC leakage test, high voltage test is an essential instrument.
BYSB Series
Try lighter strings produce orthogonal columns
Pressure Flow character goods
Test-type shock DC AC , Yung AC AC output
Cover DC DC out
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Second, the product structure
BYSB series light high voltage test transformer core is a single frame type. Coil using multi-tower structure with the core cylinder, the primary low voltage winding wound on the core, the secondary winding of high voltage winding is wound on the outside of the coaxial arrangement reduces the coupling loss between the windings. High voltage silicon stack with a special technology package in the casing, the product's enclosure is made better with the intercooler core with octagonal structure, the overall looks nice. Their internal and external structure shown in Figure 1 .
Figure BYSB test transformer schematic
1 - equalizing ball; 2 - silicon stack short rods; 3 - HV bushing; 4 - oil valve; 5 -shell; 6 , 7 - to adjust the voltage input a , x terminals; 8 , 9 - instrument measuring E, F Terminals; 10 - High End X terminal; 11 - transformer enclosure ground terminal; 2 - High Output A terminal; 13 - high voltage rectifier silicon stack; 14 - Internal equalizing ring; 15 - transformer core; 16 - primary voltage winding; 17 - measuring instrument winding; 18 - secondary level voltage winding; 19 - transformer oil.
Third, the principle
BYSB series light high voltage test transformer single phase transformer, connection symbol II. Single working process of high voltage test transformer with AC 220V ( 10KVA above 380V ) power supply voltage access control box (Taiwan), the power control box (Taiwan) within the self-coupling voltage regulator ( 50KVA above regulator attached outside) adjustment 0 ~ 200V( 10KVA above 0 ~ 400V ) voltage to the primary winding of the transformer test, according to the principle of electromagnetic induction, the test available to test the high voltage winding transformer high voltage required. Its working principle is shown in Figure 2 below.
1 , a single BYSB Schematic diagram of high-voltage test transformer
Figure 2 : a single high-voltage test transformer working principle diagram
In the test transformer:
a , x for the low voltage input terminal;
A , X for the high voltage output terminal;
E , F for the instrument measuring end.
2 , a single AC and DC high voltage test transformer works shown in Figure 3 . Shown in the figure: high voltage bushing built with high voltage diodes, high voltage circuit connected in series for high-voltage rectifier to get DC high voltage. When a short-circuit voltage silicon stack lever short, the availability of AC high voltage, its status is AC output; contrary in the short lever out of its state of DC output.
3 , three high-voltage test transformer series wound for higher voltage principle of Figure 4, series high-voltage test transformer has a great advantage, because the entire test device consists of a plurality of single flyback transformer test string composed of a single test transformer has a small size, light weight, easy to transport characteristics, It can be concatenated into a single test several times higher than the output voltage of the transformer used in combination, they can be used separately. Entire test device small investment, affordable. Figure 3 shows: in three series wound transformer test string excitation in use, a single test transformer B1 , B2 , B3 of the output voltage is U , first, two of the test transformer has an internal excitation windings, respectively. of A1 , C1 andA2 , C2 . When the control voltage is applied to the first level test transformer B1 primary winding A1 , X1 , the excitation windings A1 , C1 to give test transformer B2 primary winding of the power supply, the second stage test transformer B2 excitation winding A2 , C2 to test transformer B3 primary winding. As the first stage test transformer B1 high pressure tail and body ground, and the second, three of the test transformer B2 and B3 bracket with insulation to ground isolation, so test transformer B1 , B2 , B3 , respectively the output voltage to ground 1U , 2U , 3U .
Figure 3 : Three high-voltage test transformer series excited working principle diagram
B1 , B2- string-excited high-voltage transformer; 1U , 2U , 3U- to-ground voltage levels;
PV- pressure indication table ( KV ); ZJ1 , ZJ2- insulated bracket.
Fourth, the use of methods and precautions
1 , BYSB workmanship frequency withstand voltage test transformer wiring method used to test 5 . Workmanship frequency voltage withstand test before the rated capacity of the transformer under test choose a good current limiting resistor, ( water resistance )resistance, according to the test product to be added to adjust the high voltage discharge gap ball ball pitch, in order to raise awareness of the test product applied voltage measurement accuracy, the high-pressure side access FRC RC divider to measure voltage.
Figure 4 : Power frequency voltage withstand test using the wiring schematic diagram
R1 , R2- limiting resistor; Qx- discharge ball gap; Zx- products were tested;
FRC- RC divider; V- divider High Table.
As shown in Figure 4 , with Figure 2 the frequency voltage withstand test carried out work connected lines, high voltage test transformer winding the X terminal (high end), instrument measuring winding F side, test transformer enclosure and power control box ( Taiwan) enclosure must be grounded.
Transformer with three test series wound workmanship frequency voltage withstand test, the second, three test transformer primary winding X terminal, instrument measuring winding Fside, as well as high voltage winding X terminal (high end) are connected at the same level test the transformer housing, the second and third test transformer must be placed on the insulating body bracket. In addition to the first level outside the second, three test transformer body not ground wire. The wiring method shown in Figure 3 below.
Then the power before the power control box (Taiwan) The regulator must be set to zero.After power on, the green indicator light, click the Start button, the red indicator light, said test transformer is connected to control power, began to boost.
Start from zero uniform rotation clockwise handwheel boost regulator. (Boost modes: quick step method, namely 20S gradual step method, the slow step method, namely 60S gradual step method, a very slow step method for selection) voltage zero by Selected Boost the speed you need to rise to the rated test voltage 75% , and then per second 2% nominal test voltage rise speed test voltage you need, and pay close attention to the instructions and measuring instruments test case is being time of the test voltage is applied to the rear. Should be uniform within seconds returns the regulator, high pressure dropped to 1/3 test voltage, click the stop button, high pressure, low output stops, and then disconnect the power cord, the test is completed.
Frequency voltage withstand test procedure Precautions
1 , test personnel should be prepared to the division of responsibilities , set up a safe distance from the test site , carefully inspect and test products were tested good grounding of the transformer , and a safe and secure custody status of observing the test work.
2 , the main part of the test product should be cleaned, kept absolutely dry to avoid damage caused by the test product and test numerical errors.
3 , for large equipment tests shall be carried out generally empty l test test transformer, which is not connected to the test when the test voltage boost to proofread better instrument indication accuracy, adjust gap discharge ball ball pitch.
4 , when the boost pressure test speeds do not be too fast, and to prevent sudden pressure, for example, the regulator is not zero the sudden closing, nor a sudden power failure, should generally be reduced to zero at midnight regulator gates .
5 , the boost pressure test or process, such as found in the following irregularities, a voltage meter pointer swing big, two products were tested making an unusual sound, three found a charred insulation or smoke, should immediately buck, cut off the power, stop the test and find out why.
6 , the use of this product do high voltage test, in addition to familiar with this specification, it must also strictly enforce the relevant national standards and procedures.
2 , BYSB AC and DC high voltage test transformer DC voltage and leakage tests done using the wiring method shown in Figure 5 . As the AC and DC high voltage test transformer, high voltage silicon stack should be short rod is withdrawn from the casing, so that the test transformer DC output state. DC leakage test done before the leak test according to the output circuit current does not exceed the maximum stack voltage silicon rectifier appropriate, choosing a current limiting resistor (water resistance) the resistance of the test product according to the waveform of the DC high voltage requirements choose a good high-pressure filter capacitor capacitance values. In order to improve the voltage to be applied to the test measurement accuracy, the high-pressure side should access FRC RC divider to measure voltage.
Figure 5 : DC leakage test using the wiring schematic diagram
R- limiting resistor; C- voltage filter capacitor; Zx- products were tested; G- silicon stack short rods;
FRC- RC divider; V- divider High Table; uA- microampere meter; D- voltage rectifier silicon stack.
According to Figure 5 , with Figure 3 a DC leakage test conducted working line connected.High voltage test transformer windings X terminal (high end), instrument measuring winding F side, test transformer enclosure and power control box (Taiwan) enclosure must be grounded.
Then the power before the power control box (Taiwan) The regulator must be set to zero.After power on, the green indicator light, click the Start button, the red indicator light, said test transformer is connected to control power, began to boost.
Start from zero uniform rotation clockwise handwheel boost regulator. (Boost modes: quick boost France ie 20S gradual step method; slow step method, namely 60S gradual step method; slow step method for the selection stage) voltage zero by selected l You need to rise to the rated pressure speed test voltage or rated DC current reference voltage. Note that the test should be closely DC high voltage meter, leakage current meter indication and the test situation. After testing, the pressure should be rapidly and uniformly reduced to zero, click the stop button, high pressure, low output stops, and then cut off the power. At this point the application to the DC high voltage discharge rod products were tested and the test device itself fully discharged.
DC leakage test procedure Precautions
( a ) test personnel responsibilities should be prepared to set a good test site safe distance, carefully check the products were tested and a good grounding transformer test case, and there is someone to monitor safety and observing the status of the test work.
( 2 ) products were tested before doing the experiment, all external connections shall be removed and fully discharge the main parts should be cleaned, kept absolutely dry to avoid damage caused by the test product and test numerical errors.
( 3 ) For bulk sample (capacitors, long cables, etc.) shall be tested slow step, and prevent the charging current of the sample is too large to burn microampere meter, respectively, when necessary, graded compression of the voltage reading the microammeter stable reading.
( 4 ) During the test, the test should be closely monitored, microampere meter and test equipment, etc., in the event of flash buck breakdown phenomenon should be immediately cut off the power, and to identify the cause.
Five, ancillary products
The following products are for choice when buying an additional valuation.
1. BYSB Series Power Control Tank Capacity : 1KVA ~ 5KVA , Input voltage: 220V
2. BYSB Series Power Console Capacity : 10KVA ~ 300KVA Input voltage: 220V or 380V
3 Digital microampere meter: QSA
4 high voltage filter capacitor: 0.01mF , 40 ~ 100KV
5 HVDC discharge rod: FZ - 70 , 140 , 210KV
6. Discharge ball gap: Q - 50 , 100 , 150 , 200 , 250 , 500
7 standard test oil cup: 400ml
8 Folding trolley: 150 , 300 type
9 insulated bracket: 50 , 100 , 200 , 300 , 400KV
10 RC divider: FRC - 50 , 100 , 150 , 200KV
11 high voltage silicon stack: 2DL - 150 , 300 , 450KV
12 Water resistance: 50 , 100
6, the main choice of test equipment
1 , test transformer
Its high-pressure side of the rated voltage should not be less than the maximum test voltage test, the rated current is not less than the maximum capacitive current test. The products were tested and the test transformer capacitive current required capacity calculated as:
Products were tested capacitance Cx measured by AC bridge.
2 , pressure control equipment
( 1 ) self-coupling voltage regulator. Wide range of its regulator, power loss, waveform distortion, choose this voltage mode for the best. Self-coupling voltage regulator capacity by0.75 to 1 times the test transformer capacity options for a capacity of 100KVA transformer regulator following test.
( 2 ) induction regulator. Its regulator range, waveform deformity small but complex structure, the price is more expensive, when the test transformer capacity is large (eg100KVA above) to use.
3 , the current limiting resistor
The role of the current limiting resistor, when the test product breakdown, current limiting circuit, thereby protecting test transformer, prevent the failure to expand. Its value to the highest test voltage shall prevail, according to 0.5 ~ 1 omega / V (rms) selection, the current limiting resistor can be water resistance. Note that water can not be filled with glass, should leave room to prevent bursting.
4 , the discharge ball gap
Arrangement of a gap discharge with a vertical and horizontal two kinds, a gap spacing Sand the ball diameter D of relations should protect 0.05D ≤ S ≤ 0.5D range, the water resistance of a gap resistance is generally 0.1 to 1 omega / V selected , set the discharge gap ball on the important purpose of the protective effect of the test product , you can test product due to misuse or breakdown caused by over-voltage limit within the allowable range.
Seven, test transformer technical instructions
1 , the use of environmental conditions
Ambient temperature is not higher than +40 ℃, not lower than - 20 ℃;
Air relative humidity less than 90% ;
Altitude not exceeding 2000 meters;
2 , the operating voltage
Power control box (Taiwan) frequency input voltage 220V or 380V , the relative error does not exceed ± 10% ; (specific use voltage test transformer according to specifications set by the user selected)
Eight, accompanying documentation
BYSB series of test transformer product manual 1 copy
Factory test reports a copy
Product certification a copy
Packing List 1 part