GB 9326.1-1988 General provisions for oil-paper insulated self-contained oil-filled cables and accessories AC 330 kV and below
Some standard content:
National Standard of the People's Republic of China
General provisions for oil-filled paper-insulated cables and accessories for alternating voltages up to and including 330 kV generalGB9326. 1—88
This standard is equivalent to the provisions of the international standard IEC141--1 (1976) "Paper insulation, metal sheath, oil-filled cables and accessories for AC voltage 400kV and below".
1 Scope of application
1.1 This standard applies to oil-paper insulated self-contained oil-filled cables and accessories with AC rated voltage 110~330kV for transmission and distribution of electric energy. 1.2 Part 1 of this standard must be used together with subsequent parts of this standard. 2 Definition
2.1 Rated voltage
The rated voltage is the reference voltage used for cable and accessory design and electrical performance testing, and is expressed in U. /U means, where: U. The effective value of the rated power frequency voltage between the conductors and the insulation shield designed for cables and accessories, in kV; the effective value of the rated power frequency voltage between the conductors of each phase designed for U cables and accessories, in kV. 2.2 Lightning impulse voltage
U—the peak value of the lightning impulse voltage that the cable and accessories are designed to withstand, in kV. 2.3 Operating impulse voltage
Us—the peak operating impulse voltage that cables and accessories are designed to withstand, in kV. 2.4 Maximum system voltage bZxz.net
U.--The maximum voltage of the system is the highest effective value of the phase-to-phase voltage at any time and at any point on the power grid under normal operating conditions. It does not include those caused by fault conditions and sudden cutoff of large loads. Temporary change in voltage, unit is kV. 2.5 Working oil pressure
refers to the actual oil pressure value that the cable and accessories bear during normal operation, in MPa. 2.6 Maximum design oil pressure
The maximum oil pressure value required for the design of cables and accessories. If no regulations are specified, the maximum design oil pressure is equal to the maximum working oil pressure, in MPa.
2.7 Nominal value
The specified value that must be guaranteed during manufacturing, and there are specified tolerances. 2.8 Measured value
The value obtained by measuring or testing using specified methods. 2.9 Test classification
Tests are divided into type tests (T), sampling tests (S) and routine tests (R). The definitions are found in GB2951.1 "General Principles of Test Methods for Mechanical and Physical Properties of Wires and Cables".
The National Machinery Industry Commission approved the implementation on 1989-01-01 on 23 May 1988
GB9326.1-88
This standard adopts GB2900.10 "Electrical Terminology 2.10||tt ||3 Product naming and code
3.1 code
3.1.1 Product series code
Self-contained oil-filled cable
3.1.2 Accessory code||tt| |Open terminal
Closed terminal
Straight-through joint
Plug joint:
Pressure supply tank
3.1.3 Material characteristic code|| tt||Copper conductor
Aluminum conductor
Paper insulation...
Lead sheath
Aluminum sheath
3.1.4 Outer sheath code according to table 1 regulations.
Code name
1
2
3
4
Reinforcement layer
Copper strip radial reinforcement||tt ||Stainless steel strip radially reinforced
Copper strip radially narrow copper strip longitudinally reinforced
Stainless steel strip radially narrow stainless steel strip longitudinally reinforced
3.1.5 Terminal internal and external insulation codes are according to Table 2 Regulation. Internal insulation
increased winding insulation
capacitive insulation
code
1
2
3.1.6 Pressure supply tank oil pressure The range codes are specified in Table 3. Oil pressure range
0.02MPa≤P<0.4MPa
≥0.4MPa
3.2 Product marking method
terms and definitions of wires and cables".
Table 1
Code number
0
4
Table 2
Table 3
Armor layer||tt ||No armor
Thick steel wire
Outer insulation
Ordinary porcelain sleeve
Generation
Code name
1
2
No.
1
To be determined
CY
ZK;
ZF;
JT;||tt| |JS;
XY.
Omitted;
L;
Z;
Q;
Outer layer
Fiber layer
Vinyl sheath
Code
1
3.2.1 The cable product model consists of the product series code and the code of each component. The product uses model specifications (rated voltage, number of cores, nominal Section) and standard number, its composition is as follows: 1
[2]
3
4
park
outer sheath code|| tt||GB9326.1—88
口/×口
口
metal sheath code
insulation layer code
conductor code||tt ||Product series code
Standard number
Nominal cross-section
-Number of cores
Rated voltage
In view of the fact that various types of oil-filled cables are available The inner lining layer and protective layer of the protective reinforcement layer have the same structure, so the characteristics of the inner lining layer and protective layer are not expressed in the cable model. The code of the cable outer sheath is represented by a combination of codes for the reinforcement layer, armor layer and outer coating layer from the inside to the outside according to the cable outer sheath structure.
Since the protective layer of unarmored self-contained oil-filled cables also plays the role of outer coating, in order to make the outer sheath code clear, intuitive, and consistent among various products, the protection of such cables is The outer layer is regarded as the outer covering layer, and the extruded polyethylene sheath of the protective layer is represented by the outer covering layer code 2. The protective layer of the extruded polyvinyl chloride sheath for armored self-contained oil-filled cables is not shown in the outer sheath. 3.2.2 The accessory model consists of the cable product series code, accessory code and terminal internal and external insulation (or pressure tank oil pressure range) code. The product is represented by model, specification (rated voltage, applicable cable cross-section or oil supply) and standard number. Its structure is shown as follows: Ritu Diagram
3.2.3 Example
Terminal internal and external insulation (or pressure
force box oil pressure range) code
Accessory code||tt ||Product series code
口
口
Standard number
Applicable cable cross-section
Rated voltage (or oil supply)||tt| |Copper core paper insulated lead-clad copper tape radial narrow copper tape longitudinally reinforced PVC sheathed self-contained oil-filled cable, rated voltage 220kV, single core, nominal cross-section 400mm, expressed as: CYZQ302220/1X400GB9326.2|| tt||Self-contained oil-filled cables use ordinary type increased winding insulated open terminals, rated voltage 110kV, applicable cable cross-section 240mm, table b.
is shown as:
CYZK11110/240GB9326.3
Straight-through connector for self-contained oil-filled cables, rated voltage 220kV, cable cross-section 600mm, expressed as: c.
CYJT220/600GB9326.4
For self-contained oil-filled cables Pressure oil supply tank, oil supply capacity 50L, expressed as: d.
CYXY150GB9326.5
4 Test conditions
4.1 The frequency of the AC test voltage is 49~61Hz, and the voltage waveform should be basic Above is a sine wave. GB 9326.1-88
The front time of the voltage waveform for the impact test is 1~the wave tail time is 4~6. The front time of the voltage waveform for the impact test is 250 s. The allowable error is ±20%, half peak value. The time is 2500us, allowing errors. 4.4 Unless otherwise specified in the relevant test, the ambient temperature of the test should be tested after laying and installing in 5, refer to the appendix
each item)!
A1 completion test
A1.1 oil flow test
GB9326.1—88
Appendix A
Completion test
(reference part)
Carry out a free flow test of oil after laying and installation to check whether there is any oil in the oil passages of cables and accessories. No blockage exists. The oil flow test shall be carried out on each phase of the cable line. The lower end of the test cable line is connected to an auxiliary pressure tank, and the upper end is connected to an oil spill pipe with a valve and a pressure gauge. The pressure of the auxiliary pressure tank should be adjusted so that the highest pressure ranges from 0.05 to 0.1MPa. Close the working pressure tank valve on the cable phase under test and open the valve on the auxiliary pressure tank. After the cable phase under test is subjected to the test pressure for 1 hour, open the valve on the oil spill pipe. After obtaining a stable jet, inject 0.001m* oil into the measuring cylinder. Record the time it takes for the oil to start overflowing to the measuring cylinder and end the overflow. The time and the pressure of the auxiliary pressure tank, and converted into the volume of oil flowing out per unit time Q (m/s), should be consistent with the theoretical outflow calculated according to formula (A1). Q=0.394(p-1. 02×10*hr)rl
nl
In the formula: the average excess pressure of the auxiliary pressure tank during the period when the oil overflows to the meter, Pa; h— The position difference between the upper end and the lower end of the first phase of the test line segment, m; - the density of the oil, t/m~;
- the radius of the oil passage, m;
l - the length of the oil passage , m;
n—the viscosity of the oil at the test temperature, Pa*s. The volume of oil derived from the measurement results should not be less than 80% of the value calculated according to the theoretical formula. A1.2 Impregnation coefficient test
·(A1)
The impregnation coefficient K is a parameter indicating the characteristics of the gas content in the insulation. K should not be greater than 60×10-4 (pressure in MPa). When the pressure is measured in kgf/cm2, K should not be greater than 6×10-*. Immersion coefficient measurements shall be made on each phase of the cable run. The auxiliary pressure tank and the oil spill pipe with valve and pressure gauge are connected to the tested cable. The pressure of the auxiliary pressure tank is the same as specified in A1.1. The auxiliary pressure box is connected to the upper end of the cable phase under test. During the test, close the valve on the working pressure tank of the cable phase under test and open the valve on the auxiliary pressure tank. After 1 hour under the test pressure, close the valve on the auxiliary pressure tank, open the valve of the oil spill pipe, and put the oil into the measuring cylinder. After draining the oil, close the oil spill pipe valve and restore oil supply to the cable line.
Calculate the immersion coefficient K (MPa\1)AV according to formula (A2)
K=
Ap.w
where: AV - from the test line The volume of oil flowing out of one phase, m~; V - the volume of oil contained in the phase, m\;
- the difference in pressure in the phase before and after the oil flowing out, MPa. p
A1.3 oil sample test
......(A2)
After the cable system is installed, the oil is filled to reach the design oil pressure, and after standing for 72 hours, it should be Take an oil sample from the cable terminal outlet rod for testing. Its performance should comply with the following regulations:
The power frequency voltage breakdown strength at room temperature should be greater than 50kV/2.5mm; the oil temperature should be 100±1℃, and the electric field gradient should be 1kV/ mm, tgo should be less than the requirements of Table A1. A1.4 High Voltage Test
Rated voltage, kv
110,220
330
GB9326.1-88
Table A1
tgo| | tt | Apply the DC voltage specified in Table A2 for 15 minutes, and the insulation should not break down. If the cable ends are inserted into a transformer or enclosed switch, this test requires agreement between the user and the transformer or switch manufacturer and the cable manufacturer.
A1.5 Outer Sheath DC Withstand Voltage Test
After the cable system is laid and installed, the polyvinyl chloride outer sheath should withstand the 10kV DC voltage withstand test for 1 minute without breakdown. The voltage is applied to the metal Between the sheath or armor and the graphite conductive layer on the surface of the outer sheath, Table A2
rated voltage
U.
U
110
220
330
Additional notes:
This standard is under the jurisdiction of Shanghai Cable Research Institute. 64
130
200
This standard was drafted by Shanghai Cable Research Institute, Shanghai Cable Factory, Shenyang Cable Factory, etc. The main drafter of this standard is Sang Jiming.
DC test voltage
290
520
700
kv
5 Outer sheath DC withstand voltage test
After the cable system is laid and installed, the PVC outer sheath should withstand a 10kV DC voltage withstand test for 1 minute without breakdown. The voltage is applied between the metal sheath or armor and the outer sheath. Between the graphite conductive layers on the surface of the protective layer, Table A2
rated voltage
U.
U
110
220
330
Additional notes:
This standard is under the jurisdiction of Shanghai Cable Research Institute. 64
130
200
This standard was drafted by Shanghai Cable Research Institute, Shanghai Cable Factory, Shenyang Cable Factory, etc. The main drafter of this standard is Sang Jiming.
DC test voltage
290
520
700
kv
5 Outer sheath DC withstand voltage test
After the cable system is laid and installed, the PVC outer sheath should withstand a 10kV DC voltage withstand test for 1 minute without breakdown. The voltage is applied between the metal sheath or armor and the outer sheath. Between the graphite conductive layers on the surface of the protective layer, Table A2
rated voltage
U.
U
110
220
330
Additional notes:
This standard is under the jurisdiction of Shanghai Cable Research Institute. 64
130
200
This standard was drafted by Shanghai Cable Research Institute, Shanghai Cable Factory, Shenyang Cable Factory, etc. The main drafter of this standard is Sang Jiming.
DC test voltage
290
520
700
kv
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