What are the commonly used test transformers in electrical preventive testing? What are the functions and advantages-Chemical Instrument Network

one、Inflatable test transformer

After years of effort, our company has successfully developed an inflatable lightweight test transformer. Compared with traditional oil immersed lightweight test transformers, this series of products has reduced weight by 20% -60% (depending on voltage and capacity level, dry-type test transformers above 20KVA and oil immersed test transformers are about 1.5 times heavier than inflatable ones), and have no oil pollution. They are widely used in laboratories, quality inspection departments, etc. The voltage level of a single test transformer can reach 300KV. The voltage level of insulating oil is the highest single unit, 250KV, so it is also a product in high-voltage testing. Due to the use of new production technology, the technical performance of the product has been greatly improved, and the partial discharge capacity is small. It is commonly used as a complete set of test transformers without partial discharge. Medium usage, the local volume can reach less than 3PC. Often used as the * product for testing transformers in complete voltage withstand tests without partial discharge.

2、 Product Structure:

1. The design concept, material selection, and process flow of the YDQ inflatable test transformer series products are all brand new. The widely used GIS combination cabinet features small weight, light volume, beautiful appearance, and all technical indicators meet the standard requirements, with high insulation strength.

The YDQ inflatable test transformer series products use cold-rolled DQ-151 oriented silicon steel sheets stacked into multi-stage cylindrical frame shaped iron cores, and are directly and continuously wound with QZ type wires on a specially designed high-strength insulation cylinder to form high-voltage tower coils. The outer shell is of appropriate size and filled with SF6 gas.

2. The difference between the YDQ (JZ) AC/DC inflatable test transformer product and the YDQ inflatable test transformer product lies in the clever installation of a high-voltage rectifier silicon stack inside a high-voltage sleeve, which can be transformed into a power frequency high-voltage AC output or a high-voltage DC output through the insertion and extraction of a short-circuit rod. This function can be used when conducting a DC withstand voltage test.

IIIYDQTechnical parameters of series test transformers:

Specifications	capacity KVA	low-pressure side	high-voltage side	measurement change	6 minutes temperature rise ℃	impedance voltage ％	no-load current ％	quality Kg	Overall dimensions Length x Width x Height mmmmmm
voltage V	current A	voltage KV	current mA

1.5/50	1.5	200	7.5	50	30	500	50	10	<4	30	200X275X640
3/50	3	200	15	50	60	500	50	10	<4	35	240X300X690
5/50	5	200	25	50	120	500	50	10	<4	40	250X355X710
10/50	10	200	50	50	200	500	50	10	<4	60	260H375H750
15/50	15	400	37.5	50	300	500	50	8	<4	70	270H420H800
20/50	20	400	50	50	400	500	50	8	<4	85	285H440H820
30/50	30	400	75	50	600	500	50	8	<4	100	295H386H840
50/50	50	400	125	50	1000	500	50	8	<4	120	320H416H910
10/100	10	200	50	100	100	1000	50	10	<4	65	350H475H1300
15/100	15	400	37.5	100	150	1000	50	8	<4	85	510H390H1320
20/100	20	400	50	100	200	1000	50	8	<4	100	540H400H1340
30/100	30	400	75	100	300	1000	50	8	<4	110	560H410H1360
50/100	50	400	125	100	500	1000	50	8	<4	125	600H460H1410
10/150	10	200	50	100	66.7	1500	50	10	<4	90	265H380H1750
15/150	15	400	37.5	150	100	1500	50	8	<4	100	510H390H1800
20/150	30	400	50	150	133	1500	50	8	<4	110	540H415H1800
30/150	30	400	75	150	200	1500	50	8	<4	125	560H430H1800
50/150	50	400	125	150	333	1500	50	8	<4	140	640H490H1850

YD Oil Immersed Series Test Transformer

Oil immersed test transformer is a basic testing equipment for users such as power plants, power supply and distribution systems, and scientific research institutions. It is used to conduct insulation strength tests on various electrical products, electrical components, insulation materials, etc. under specified voltages, assess the insulation level of the products, discover insulation defects of the tested products, and measure the ability to withstand overvoltage. Oil immersed test transformer is the prototype of * type test transformer. Zui ancient equipment is also a product that does not need to be updated but never lags behind.

II. Structure

The iron core of this series of products is a single-phase core type, made of cold-rolled oriented silicon steel sheets stacked together, and the fastening method uses steel as a clamp. The high-voltage coil is a cylindrical multi-layer tower, made of polyester enameled wire and high voltage insulation material wound around it. The low-voltage coil is located outside, and the instrument coil is an independent winding, generally 100V. The shell is octagonal, and test transformers above 10KVA are equipped with movable iron wheels. It has the characteristics of light weight, small size, easy mobility, and excellent performance.

3、 Technical parameters

Test transformer parameters:

Specifications	capacity KVA	low-pressure side	high-voltage side	60 minute temperature rise ℃	Impedance voltage%	no-load current ％	quality kg	Overall dimensions Length x Width x Height mmmmmmmmmm
voltage V	current A	Voltage KV	current mA

1.5/50	1.5	200	7.5	30	500	50	10	<4	19.5	200X275X640
3/50	3	200	15	60	500	50	10	<4	27	240X300X690
5/50	5	200	25	100	500	50	10	<4	52	250X355X710
10/50	10	200	50	200	500	50	10	<4	80	260H375H750
15/50	15	400	37.5	300	500	50	8	<4	120	270H420H800
20/50	20	400	50	400	500	50	8	<4	140	285H440H820
30/50	30	400	75	600	500	50	8	<4	155	295H386H840
50/50	50	400	125	1000	500	50	8	<4	184	320H416H910
10/100	10	200	50	100	1000	50	10	<4	135	350H475H1300
15/100	15	400	37.5	150	1000	50	8	<4	150	510H390H1320
20/100	20	400	50	200	1000	50	8	<4	215	540H400H1340
30/100	30	400	75	300	1000	50	8	<4	250	560H410H1360
50/100	50	400	125	500	1000	50	8	<4	290	600H460H1410
10/150	10	200	50	66.7	1500	50	10	<4	180	265H380H1750
15/150	15	400	37.5	100	1500	50	8	<4	200	510H390H1800
20/150	30	400	50	133.3	1500	50	8	<4	220	540H415H1800
30/150	30	400	75	200	1500	50	8	<4	280	560H430H1800
50/150	50	400	125	333.3	1500	50	8	<4	340	640H490H1850

One Product Introduction

Dry type test transformers are suitable for on-site testing of power systems and various power users. They are small in size and convenient for various on-site tests.

II Product Features

Dry type test transformer is an improved product of Huading Power based on YD oil immersed test transformer. It introduces * technology, and the coil is vacuum cast with epoxy resin, which is small in size, lighter in weight, stable in performance, easy to carry, and effectively reduces leakage magnetic field, improves insulation strength and moisture resistance.

III Technical Indicators:

1. Impedance voltage: 4.5% -8%

2. Output voltage waveform: sine wave

3. Surface temperature rise: ＜ 55 ℃

4. No load loss: 0.2% -0.35%

5. Allow continuous operation time: 2 hours

6. Intermittent operation time: Continuous

Main technical parameters:

Specification Model	capacity （KVA）	Input voltage (V)	Output voltage (kV)	output current (mA)	Output DC high voltage (KV)	The largest external size (mm)	weight (Kg)
GTB-1.5/50	1.5	200	50	30	70	250×200×370	20
GTB-3/50	3	60	270×220×370	27
GTB-5/50	5	100	300×270×490	48
GTB-10/50	10	200	380×290×500	68
GTB-15/50	15	300	380×290×800	78
GTB-20/50	20	400	380×290×800	82
GTB-2/100	2	100	20	140	300×270×560	52
GTB-5/100	5	60	380×290×800	76
GTB-10/100	10	100	380×290×1000	80
GTB-15/100	15	150	380×290×1000	90

DC technical parameters:

The parameters of the AC/DC dual-purpose test transformer are as shown in the table above. The rated DC voltage in the DC parameters is 1.4 times the AC voltage, and the rated DC current is 0.7 times the AC current.