GB/T 20834-2024 English PDF (GBT20834-2024)

Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click GB/T 20834-2024
Historical versions: GB/T 20834-2024
Preview True-PDF (Reload/Scroll if blank)

GB/T 20834-2024: Technical requirements for motor-generator
GB/T 20834-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.160
CCS K 20
Replacing GB/T 20834-2014
Technical requirements for motor-generator
ISSUED ON: SEPTEMBER 29, 2024
IMPLEMENTED ON: APRIL 01, 2025
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 4
1 Scope ... 8
2 Normative references ... 8
3 Terms and definitions ... 9
4 On-site operating conditions ... 9
5 Ratings and parameters ... 9
5.1 Capacity and power ... 9
5.2 Rated voltage ... 10
5.3 Rated power factor ... 10
5.4 Rated speed ... 10
5.5 Changes in voltage and frequency during operation ... 10
5.6 Efficiency and loss ... 12
5.7 Electrical parameters and time constants ... 12
5.8 Total Harmonic Distortion (THD) ... 13
6 Temperature ... 13
6.1 Temperature rise ... 13
6.2 Measurement of stator temperature rise ... 13
6.3 Correction of temperature rise limit under non-reference operating conditions and rated
conditions ... 14
6.4 Bearing temperature ... 14
7 Operating characteristics and electrical connections ... 14
7.1 Special operating requirements ... 14
7.2 Electric starting method ... 14
7.3 Electrical connection ... 15
8 Insulation system ... 15
9 Mechanical properties and design ... 15
9.1 Rotation direction ... 15
9.2 Maximum design speed ... 15
9.3 Critical speed ... 16
9.4 Vibration analysis and natural frequency ... 16
9.5 Structural strength and rigidity ... 16
9.6 Starting and stopping... 17
9.7 Speeding ... 17
10 Vibration and swing ... 17
11 Noise ... 17
12 Structural requirements ... 17
Technical requirements for motor-generator
1 Scope
This document specifies the overall technical requirements for generator motors and
their ancillary equipment, as well as requirements for product identification, material
and component storage, factory and field testing, supply and trial operation, and
warranty period.
This document is applicable to three-phase, 50 Hz, reversible salient-pole synchronous
generator motors (hereinafter referred to as "generator motors") directly connected to
pump-turbines with a rated capacity of 100 MVA and above. For units with a rated
capacity of less than 100 MVA or a frequency of 60 Hz, this document can be used as
a reference.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 755, Rotating electrical machines -- Rating and performance
GB/T 2900.25, Electrotechnical terminology -- Rotating electrical machines
GB/T 5321, Measurement of loss and efficiency for electrical machine by the
calorimetric method
GB/T 7894-2023, Fundamental technical requirements for hydro generators
GB/T 11805, General specifications of automatic control components (devices) and
their related system for hydro-turbine generating sets
GB/T 18482, Specification for start-up test of reversible pumped-storage units
GB/T 25442, Standard methods for determining losses and efficiency of rotation
electrical machines from tests (excluding machines for traction vehicles)
GB/T 36550, Basic terminology of pumped storage power station
GB 50084, Code of design for sprinkler systems
GB 50193, Code of design for carbon dioxide fire extinguishing systems
NB/T 47004.1, Plate heat exchangers - Part 1: Plate-and-frame heat exchangers
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 2900.25,
GB/T 755, GB/T 7894 and GB/T 36550 apply.
4 On-site operating conditions
Unless otherwise specified, the generator motor shall be able to operate continuously at
rated speed under the following environmental conditions:
a) Altitude shall not exceed 1000 m;
b) Cooling air temperature shall not exceed 40℃;
c) Inlet water temperature of air cooler and oil cooler shall not be higher than 30℃
and not lower than 5℃;
d) Relative humidity shall not exceed 85%;
e) Meet the requirements of local earthquake acceleration. The purchaser shall
provide the requirements of horizontal and vertical acceleration values according
to the geographical conditions of the location.
For operating environments that are different from the above requirements, the on-site
operating conditions shall be determined by negotiation between the supplier and the
purchaser.
5 Ratings and parameters
5.1 Capacity and power
5.1.1 The rated capacity under power generation conditions refers to the apparent power
output at the rated frequency, rated voltage and rated power factor, and the unit is MVA.
5.1.2 The rated power under electric working condition refers to the mechanical power
output on the shaft under rated frequency, rated voltage and rated power factor, and the
unit is MW.
5.1.3 The capacity/power of the generator motor shall match the turbine operating
output power of the pump-turbine and the maximum input power of the pump operating
condition.
5.6 Efficiency and loss
5.6.1 Weighted average efficiency
The weighted average efficiency of the generator motor is calculated according to
formula (1) in GB/T 7894-2023. The purchaser shall provide the weighted coefficients
for the generating condition and the motoring condition respectively according to the
operating mode of the unit in the system.
5.6.2 Losses
The losses and efficiency of the generator motor shall be measured by calorimetry and
shall comply with GB/T 25442 and GB/T 5321. The losses include:
a) Copper loss of stator winding;
b) Copper loss of excitation winding;
c) Core loss;
d) Ventilation loss;
e) Guide bearing loss;
f) Thrust bearing loss (only the loss value allocated to the rotating part of the
generator motor is taken into account);
g) Stray loss;
h) Excitation system loss (such as excitation transformer, rectifier and voltage
regulator loss);
i) Brush electrical and friction loss;
j) Other losses (such as thrust bearing external circulation oil pump, external cooling
fan power and other related losses).
NOTE: The tolerances for winding loss I2R, ventilation loss, motor thrust bearing loss, motor guide
bearing loss and total loss shall be determined in accordance with GB/T 7894.
5.7 Electrical parameters and time constants
5.7.1 The basic values of electrical parameters such as synchronous reactance, transient
reactance, super transient reactance, short circuit ratio and time constant shall be based
on the power generation conditions.
5.7.2 Electrical parameters and time constants shall meet the requirements of GB/T
6.3 Correction of temperature rise limit under non-reference operating conditions
and rated conditions
When the rated operating conditions of the generator motor deviate from the operating
conditions specified in Chapter 4, the temperature rise limit shall be corrected in
accordance with the provisions of GB/T 755.
6.4 Bearing temperature
6.4.1 Under normal operating conditions, the maximum temperature of the bearing of
the generator motor measured by the embedded thermometer method shall not exceed
the following values:
a) Thrust bearing Babbitt alloy pad: 80℃;
b) Guide bearing Babbitt alloy pad: 75℃.
6.4.2 The buried depth of the temperature sensor shall be 20...