JB/T 7065-2015 English PDF (JB/T7065-2015)

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JB/T 7065-2015: Pressure relief device for transformers
JB/T 7065-2015
JB
MECHANICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 29.180
K 41
Filing number: 51338-2015
Replacing JB/T 7065-2004, JB/T 7069-2004
Pressure relief device for transformers
ISSUED ON: OCTOBER 10, 2015
IMPLEMENTED ON: MARCH 01, 2016
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Structure type, product model, product specifications, installation dimensions
... 5 
4.1 Structure type ... 6 
4.2 Product model ... 6 
4.3 Product specifications ... 6 
4.4 Installation dimensions ... 7 
5 Technical requirements ... 7 
5.1 Performance parameters... 7 
5.2 Conditions of use... 7 
5.3 Action performance ... 8 
5.4 Sealing performance ... 8 
5.5 Discharge performance ... 9 
5.6 500-operation reliability ... 9 
5.7 Capacity of signal switch contact ... 9 
5.8 Insulation performance of signal switch ... 9 
5.9 Oil resistance and aging resistance of sealing ring ... 9 
5.10 Appearance requirements ... 10 
5.11 Enclosure’s protection performance ... 10 
5.12 Requirements for moisture proof, salt spray proof and mildew proof ... 10 
5.13 Vibration resistance ... 10 
6 Test items and test requirements ... 10 
6.1 Test items ... 10 
6.2 Test requirements ... 12 
7 Marking, packaging, transportation, storage, exit-factory documents ... 18 
Pressure relief device for transformers
1 Scope
This standard specifies the terms and definitions, structure type, product model,
product specifications and installation dimensions, technical requirements, test
items and test requirements, marking, packaging, transportation, storage and
exit-factory documents of pressure relief valves.
This standard applies to pressure relief valves (hereinafter referred to as relief
valves) installed on oil-immersed transformers (including transformers, reactors,
tap changers, etc.).
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 531.1 Rubber vulcanized or thermoplastic - Determination of
indentation hardness - Part 1: Durometer method (Shore hardness)
GB/T 531.2 Rubber vulcanized or thermoplastic - Determination of
indentation hardness - Part 2: IRHD pocket meter method
GB 1094.1 Power transformers - Part 1: General
GB/T 1690 Rubber, vulcanized or thermoplastic - Determination of the
effect of liquids
GB/T 2423.4 Environmental testing for electric and electronic products - Part
2: Test method - Test Db: Damp heat, cyclic (12h + 12h cycle)
GB/T 2423.16 Environmental testing - Part 2: Test methods - Test J and
guidance: Mold growth
GB/T 2423.17 Environmental testing for electric and electronic products -
Part 2: Test method - Test Ka: Salt mist
GB/T 2900.95 Electrotechnical terminology - Transformers, voltage
regulators and reactors
GB 4208 Degrees of protection provided by enclosure (IP Code)
JB/T 3837 Identification method of transformers product type
JB/T 8448.1 Technical specifications of sealing articles for transformer and
similar products - Part 1: Rubber sealing articles
JB/T 8448.2 Technical specifications of sealing articles for transformer and
similar products - Part 2: Cork rubber sealing articles
3 Terms and definitions
The terms and definitions as defined in GB/T 2900.95 as well as the following
terms and definitions apply to this document.
3.1
Operating pressure
The inlet pressure on the diaphragm when the diaphragm of the relief valve
jumps, and the transformer oil is continuously discharged.
3.2
Closing pressure
When the diaphragm re-contacts the valve seat or the opening height is zero,
the inlet pressure on the diaphragm (that is, the pressure when the leakage
through the sealing device stops).
3.3
Open time
The time it takes for the diaphragm to leave the valve seat and reach the
maximum opening height.
3.4
Seal pressure
The maximum pressure that is higher than the closing pressure and lower
than the operating pressure and can ensure the reliable sealing of the relief
valve.
4 Structure type, product model, product
- Installation position: The relief valve can be installed on the fuel tank cover,
on the raised seat or on the upper side wall of the fuel tank.
5.3 Action performance
5.3.1 Operating pressure
The operating pressure of the relief valve shall meet the requirements of Table
3.
For the relief valve with mechanical signal mark, when the relief valve is opened,
the marker rod shall move obviously. When the relief valve is closed, the marker
rod shall still stay in the opened position and reset manually. If the relief valve
is equipped with a signal switch, when the relief valve is opened, the signal
contact shall be reliably switched and self-locked, meanwhile reset manually.
If there are other special requirements, the user shall negotiate with the
manufacturer.
5.3.2 Closing pressure
The closing pressure of the relief valve shall meet the requirements of Table 3.
5.3.3 Opening time
When the pressure acting on the diaphragm reaches the operating pressure,
the relief valve shall open quickly; its open time shall not exceed 2 ms.
5.3.4 High and low temperature opening performance
When the temperature is within the range of -30 °C ~ 115 °C, the operating
pressure of the relief valve shall meet the requirements of Table 3.
5.3.5 Aging opening performance
After the assembled relief valve is left for at least 24 hours, the first operating
pressure shall meet the requirements of Table 3.
5.4 Sealing performance
5.4.1 Sealing performance of sealing pressure value
When the relief valve is closed, apply static pressure of the sealing pressure
value as specified in Table 3 to the relief valve for 2 h; there shall be no leakage.
5.4.2 Vacuum sealing performance
5.10 Appearance requirements
After the relief valve is assembled, the outer cover and valve seat shall be
straight, and the center line shall be aligned; there shall be no distortion. The
outer surface coating of the relief valve shall be oil-resistant, uniform and bright;
there shall not have defects such as peeling, blisters, or accumulation. The
marker rod shall be colored and eye-catching.
5.11 Enclosure’s protection performance
The enclosure’s protection level of the relief valve shall meet the requirements
of IPX5.
5.12 Requirements for moisture proof, salt spray proof and
mildew proof
The relief valve shall meet the requirements of the corresponding transformer
(including transformers, reactors, tap switches, etc.) products of moisture proof,
salt spray proof and mildew proof.
5.13 Vibration resistance
When the relief valve has a vibration frequency of 4 Hz ~ 20 Hz (sine wave)
and an acceleration of 2 g ~ 4 g, test it in the x-axis, y-axis, z-axis directions for
1 min. The switch contacts shall not act.
6 Test items and test requirements
6.1 Test items
6.1.1 Routine test
The routine test items are as follows:
a) Visual inspection (according to 6.2.2.1);
b) Operating pressure test (according to...