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Mechanical Industry Standard of the People's Republic of China
JB/T 6300-1992
Control Voltage Transformer
Published on June 26, 1992
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on January 1, 1993
Mechanical Industry Standard of the People's Republic of China
Control Voltage Transformer
Subject Content and Scope of Application
JB/T6300-1992
This standard specifies the product model, technical requirements, test methods, inspection rules, product nameplate, packaging, transportation and storage of control voltage transformers
This standard applies to control voltage transformers with a voltage level of 6kV and below and a frequency of 50Hz or 60Hz and DC control voltage transformers with a voltage level of 5kV and below.
Referenced standards
GB2900.15
GB1207
GB1208
GB3797
GB3859
GB3886
GB4720
GB/T13306
JB3837
ZBK41613
Insulation coordination of high-voltage power transmission and transformation equipment
High voltage test technology Part 1: General test conditions and requirements. High voltage test technology Part 2: Test procedures. High voltage test technology Part 3: Measuring devices. High voltage test technology Part 4: Guidelines for the use of measuring devices. High voltage test technology Part 5: Measuring ball gap. Electrical terminology Transformers, mutual inductors, voltage regulators and reactors Method for determination of dielectric strength of insulating oil
Voltage transformers
Current transformers
Part 2: Electronic control equipment equipped with electronic devices Electronic control equipment
Semiconductor power converters
Thyristor power converters for speed regulation of DC motors Electrical drive control equipment Part 1: Labelling of low-voltage electrical appliances and electronic control equipment
Method for compiling product models of transformers
Current transformers for control
The following definitions apply to this standard
Other terms used in this standard shall be as specified in GB 2900.15 DC voltage transformer
A transformer used to measure DC voltage in a DC system or to provide information proportional to the main circuit voltage to the control device. Zero flux or current comparison (compensation) voltage transformer 3.2
A voltage transformer with a compensation winding, with or without a detection element, and a zero core working flux. Zero flux or current comparison (compensation) DC voltage transformer 3.3
A DC voltage transformer with an excitation (or modulation) winding, with or without a detection element, and a zero core working flux. Approved by the Ministry of Machinery and Electronics Industry on June 26, 1992 and implemented on January 1, 1993
3.4 Direct voltage conversion voltage transformer
JB/T6300—1992
A voltage transformer in which the secondary voltage is directly converted through a proportional relationship between the primary winding and the secondary winding. 3.5 Indirect voltage conversion voltage transformer
A transformer composed of a resistor and an electromagnetic unit. Its design and internal wiring make the secondary voltage of the electromagnetic unit proportional to the voltage applied to the primary circuit in which the resistor is connected in series with the primary winding of the converter. Product classification and model
Control voltage transformers are used for electrical measurement, voltage feedback and electrical protection of power supply, electric control and converter equipment. Control voltage transformers are divided into: voltage transformers; direct liquid voltage transformers; bidirectional DC voltage transformers; AC and DC voltage transformers. The models of control voltage transformers are in accordance with the relevant provisions of JB3837. The alphabetical arrangement order and meaning of the product models are shown in Table 1. Table 1 Voltage transformer type Detection element Product model alphabetical order and meaning Voltage transformer DC transformer Bidirectional DC voltage transformer Alternating current voltage transformer Single-phase Transformer Oil (or synthetic liquid) Air (“flat”) Gas body Injection molding (enclosed body) \
For measurement
For protection
Indirect connection
"Series, paper
Zero magnetic "compensation" type
Quarterly magnetic flux "regulation" type
"Lin"er element
"Photoelectric" element
"Piezoelectric" element
Technical requirements
Restoration conditions
5.1.1 Normal use conditionsbZxz.net
JB/T6300—1992
The voltage transformer for control should be suitable for the following use conditions. 5.1.1.1 Altitude
Not more than 1000m above sea level,
Note: When the altitude exceeds 18, see Section 5.1.2, 5.1.1.2 Ambient temperature
Maximum temperature
Daily average temperature
Annual average temperature
Minimum temperature
Not more than +30℃
Not more than +20℃
Note: When exceeding these speeds, see Section 5.1.2. 5.1.1.3 Maximum relative humidity of air
The monthly average maximum relative humidity of the most recent month shall not exceed 9%, and the monthly average minimum temperature of the month shall not be lower than 25℃. 5.1.1.4 Atmospheric conditions
There shall be no pollution, corrosive and explosive media in the atmosphere that may seriously affect the insulation performance of the transformer. 5.1.15 Installation conditions
There shall be no severe vibration and vibration at the installation site. 5.f2
Special conditions of use
When placing an order, the user should specify the conditions of use not covered in Article 5.1.1 in detail, such as sea level, cooling air temperature, pollution resistance, earthquake resistance, anti-magnetic and other special environmental conditions.
For transformers that do not meet the normal use conditions specified in Article 5.1.1, the additional requirements for their rated values and tests (within the specified range, they shall be in accordance with the provisions of 6B1207.
For temperature conditions exceeding the specified values and special operating conditions (such as when the cooling air circulation is restricted), the surge shall be determined by negotiation between the manufacturer and the user.
5.2 Determined debt
5.2.1 New secondary voltage
The rated primary voltage of single-phase voltage transformers connected between phases in a three-phase system is 100, 220, 380, 500, 660, 1150, 3000, 6090V. The rated primary voltage of single-phase voltage transformers connected between phases and ground in a three-phase system is 100, 220, 380, 500, 660, 1150, 3000, 6090V. The secondary voltage shall be 1/V3 of the above rated voltage. The rated primary voltage of DC voltage transformers is 110, 220, 440, 630, 800, 1000, 1250, 1600, 2500, 3150, 5000V. 5.2.2 Rated secondary voltage
The rated secondary voltage of single-phase voltage transformers and DC voltage transformers connected between phases in a three-phase system is 10, 100V, and the rated secondary voltage of single-phase voltage transformers between phases and ground in a three-phase system is 10V3, 100/VFV. 5.2.3 Rated output
The rated output is 1, 1.52, 2.5, 3, 3.5, 4, 5, 6, 7.510, 15, 20, 25, 30, 40 , 50, 60, 80, 100VA. 5.2.4 Rated voltage factor
Rated voltage factor shall be in accordance with GB1207
Auxiliary power supply voltage fluctuation
The auxiliary power supply voltage fluctuation of the voltage transformer is 5%, 109%, 159%6. Within the auxiliary power supply voltage fluctuation range, the voltage error of the voltage transformer shall not exceed the limit values listed in Table 2. 3
5.3 Accuracy
JB/T6300—1992
5.3.1 Accuracy of direct voltage conversion type voltage transformer The accuracy of direct voltage conversion type voltage transformer shall be in accordance with GB1297. 5.3.2 Accuracy of indirect voltage conversion type voltage transformer 5.3 .2.1 Accuracy rating
The accuracy rating of a voltage transformer for measurement is rated as a percentage of the maximum permissible voltage error specified for that accuracy rating at rated voltage. The accuracy rating of a voltage transformer for protection is rated as a percentage of the maximum permissible voltage error specified for that accuracy rating at rated voltage within the voltage range from 5% of rated voltage to the voltage corresponding to the rated voltage factor (see 5.2.4), followed by the letter "P\". 5.3.2.2 Standard accuracy rating
The standard accuracy ratings of voltage transformers for measurement are 0.1, 0.2, 0.5, 1, and 3. The standard accuracy ratings of voltage transformers for protection are 3P and 6P. 5.4 Voltage error and phase difference limits
At rated frequency, rated load, and power factor 1.0, the voltage transformer for measurement is 509%~1209%6 rated voltage, the voltage transformer for protection is 5% rated voltage and the voltage corresponding to the rated voltage factor, the voltage error and phase difference of each accuracy level shall not exceed the limit values specified in Table 2, and the voltage error and phase difference of the voltage transformer for protection shall not exceed 2 times the limit values specified in Table 2 at 2% rated voltage. Table 2
Accuracy level
Measurement voltage
Transformer
Protective voltage
Transformer
Error limit of voltage transformer
Voltage error
±()
Not specified
For bidirectional true current voltage transformer, the voltage error in the positive and negative voltage directions shall not exceed the limit values listed in Table 2. For AC and DC voltage transformers, the AC or DC voltage errors shall not exceed the limit values listed in Table 2. Sealing performance
±Crad
Not specified
Oil-immersed control voltage transformers shall be able to withstand a sealing test of 0.04MPa pressure for 12h, and the remaining pressure shall not be less than 0.025MPa. The product shall have no seepage.
Temperature rise limit
The temperature rise limit of direct voltage conversion voltage transformers shall comply with GB1207. Indirect voltage conversion voltage transformers
The temperature rise test shall be carried out when the auxiliary power supply voltage is positive deviation, and the temperature rise limit shall comply with GB1207. The temperature rise of the additional device shall not exceed 60K.
5.7 Insulation requirements
5.7.1 Rated insulation level
The insulation level of the primary winding of the control voltage transformer shall comply with the provisions of Table 3. Apply the corresponding working withstand voltage for 1min, and there shall be no breakdown and flashover.
Voltage level
0.66(.63)
1.2(1.25)
Note: The values in brackets are DC voltage level, JB/T6300-1992
Primary winding insulation level
Rated short-time power frequency withstand voltage (effective value) 3
For AC control voltage transformers with voltage level of 3,6kV, the insulation level of the primary winding shall comply with the provisions of GB311.1~311.6. 5.7.2 Insulation requirements for secondary windings and excitation (or modulation) windings The short-time power frequency withstand voltage between secondary windings and to ground, excitation (or modulation) winding to ground, and between secondary windings and excitation (or modulation) windings are all 2kV (effective value), maintained for 1ain, and there should be no breakdown and flashover. 5.7.3 Insulation requirements for additional devices
The insulation level of the voltage transformer additional devices shall comply with the provisions of Table 4. Apply the corresponding power frequency withstand voltage 1in, there should be no breakdown and flashover Table 4
Short-time power frequency withstand voltage of additional device
AC effective value
Auxiliary power supply voltage
60
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