HYG-5kVA/50kV Light High Voltage Test Transformer

HYG-5kVA/50kV light-duty high-voltage test transformer is manufactured according to the "Test Transformer" standard of the Ministry of Mechanical and Electrical Engineering and on the basis of a large number of improvements on the original similar products. HYG-5kVA/50kV light-duty high-voltage test transformer is a new product produced on the basis of TDM (G) series test transformer and improved according to the national standard ZBK-41006-89. This series of products have the characteristics of small size, light weight, compact structure, complete functions, strong versatility and convenient use. Especially suitable for power system, industrial and mining enterprises, scientific research departments and other high-voltage electrical equipment, electrical components, insulation materials for power frequency or DC high-voltage insulation strength test. It is an indispensable and important equipment in high pressure test.

HYG-5kVA/50kV Control Box

This series of control boxes are composed of contact voltage regulator (more than 50KA is electric column voltage regulator) and its control, protection, measurement and signal circuits. It adjusts the voltage regulator (i.e. the input voltage of the test transformer) by connecting 220V or 380V power frequency power supply to obtain the required test high voltage voltage value.

I. TECHNOLOGICAL INDEX OF TEST TRANSFORMER

1. Conditions of use:

(1) ambient temperature - 20 ~+50

(2) Environmental humidity (<85% RH) (no condensate)

2. System parameters:

(1) High Voltage Output Voltage: AC 0-50kV

(2) High voltage output current: AC 0-100mA

(3) Low Voltage Input Voltage: AC 0-200V, +10%

(4) Low-voltage input current: AC 0-25A

(5) Instrument measuring end: AC 100V

(6) Timing range: 0-999S

(7) Voltage accuracy: 1.5%

(8) Current accuracy: 1.5%

2. Capacity Selection of Test Transformers

Determining formula of transformer capacity Pn in nominal test: Pn=KV n 2_Ct *10-9

Type: Pn - Nominal test transformer capacity (kVA)

Vn - Valid Value of Rated Output High Voltage of Test Transformer (kV)

K - Safety factor. When the nominal voltage Vn is greater than 1MV, k = 2; when the nominal voltage is lower, K value may be higher.

Ct - Capacitance of Subject (pF)

_ - angular frequency, _ = 2 pi f, F - frequency of test power supply

The capacitance CT of the tested equipment can be measured by AC bridge. CT varies greatly, depending on the type of equipment. Typical data are as follows:

Simple rod or suspension insulator dozens of micro-methods

Simple Classified Casing 100-1000pF

Voltage transformer 200 ~ 500pF

Power Transformer 1000 kVA~1000 pF

1000 kVA 1000~10000 pF

250~300pF/m Insulation for High Voltage Power Cable and Oil-immersed Paper

Gas Insulation ~60pF/m

Closed Substation, SF6 Gas Insulation 100~10000pF

For different test voltage Vn, choose different (appropriate) safety factor K. The K values selected for different Vns are listed below for reference.

Vn = 50-100 kV k = 4

Vn = 150~300 kV k = 3

Vn > 300kV k = 2

3. Technical parameters, specifications and matching selection of control box

The capacity of the control box is nominated as the capacity of the voltage regulator. If it works with the test transformer (working system within 30 minutes in a short time), it can be matched according to the provisions of the power industry standard of the People's Republic of China "DL474.4-92": P=0.75P. P-test transformer capacity and P-regulator capacity. If it is used for batch test of electrical equipment factory products, the capacity of voltage regulator should be equal to the capacity of test transformer, that is, P=P.

The technical parameters of the control box are shown in the table.

Specifications

Capacity (kVA)

Power Supply

Output

Outward Size (mm)

Reference Weight (kg)

Phase number

Voltage (V)

Frequency (Hz)

Voltage (V)

Current (A)

HYG-3

Three

One

Two hundred and twenty

Fifty

Two hundred and forty

Thirteen point six

300*400*220

Seventeen

HYG-5

Five

One

Two hundred and twenty

Fifty

Two hundred and forty

Twenty-two point seven

300*400*230

Twenty

HYG-10

Ten

One

Two hundred and twenty

Fifty

Two hundred and forty

Forty-five point five

410*540*680

Twenty-eight

HYG-15

Fifteen

One

Two hundred and twenty

Three hundred and eighty

Fifty

Two hundred and forty

Four hundred and thirty

Sixty-eight

Thirty-nine

410*540*680

Thirty-five

HYG-20

Twenty

Two

Three hundred and eighty

Fifty

Four hundred and thirty

Fifty-two point six

410*540*680

Forty

HYG-30

Thirty

Two

Three hundred and eighty

Fifty

Four hundred and thirty

Seventy-eight point nine

470*630*1100

Sixty-five

HYG-50

Fifty

Two

Three hundred and eighty

Fifty

Four hundred and thirty

One hundred and thirty-one point five

1020*650*1600

HYG-5kVA/50kV light high voltage test transformer adopts single frame core structure. The primary winding is on the core and the high-voltage winding is outside. This coaxial arrangement reduces the flux leakage and increases the coupling between windings. The shell of the product is made with an octagonal structure which matches the core well, and the overall shape is beautiful and generous. Its external structure is shown in Fig. 1, and its internal structure is shown in Fig. 2.

Figure 1: Single HYG-5kVA/50kV Test Figure 2: Internal Structure of Single Test Transformer

Schematic diagram of transformer external structure

1-Short Circuit Bar D 2-Ball 3-High Voltage Bushing 4-Transformer Handle

5-Oil Valve 6, 7-Secondary Pressure Input a, x 8, 9-Measuring Terminals E, F 10-Transformer Shell Grounding Terminals

11-High Voltage Tail X 12-High Voltage Output A 13-High Voltage Silicon Reactor 14-Transformer Oil

15-Iron Core 16-Secondary Low Voltage Winding 17-Measuring Winding 18-Secondary High Voltage Winding

In the HYG-5kVA/50kV test transformer, A and X are low-voltage input terminals, E and F are instrument measurement terminals, and A and X are high-voltage output.

This series of control boxes (benches) are designed and manufactured according to the unique usage range of high voltage test transformers. Their functions are as follows:

A. Closing sound and light alarm;

B. Timing sound and light alarm;

C. Electronic low voltage current protection (box type);

D. Direct reading of high voltage voltage;

E. Pressure test time is set freely (digital display);

F. Mobile structure (desktop).