This standard specifies the technical requirements, test methods, inspection rules, etc. for centralized control devices in the electrical part of power stations. This standard applies to ground electrical part centralized control devices (hereinafter referred to as centralized control devices) installed in different capacity substations or power plants in power systems and other industrial and mining enterprises. This standard is the basis for the design, manufacture, testing, storage and transportation of centralized control devices and the formulation of product standards. GB 11920-1989 General technical conditions for centralized control devices of electrical parts of power stations GB11920-1989 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
Centralized control equipment for electrical parts of power stations
General technical conditions
General specification of central control equipment for electrical parts in powerstations and substations
GB11920-89| |tt||This standard refers to the International Electrotechnical Commission IEC439-1 "Low-voltage switchgear and control devices" (1985 edition). 1 Subject content and scope of application
This standard specifies the technical requirements, test methods, inspection rules, etc. for the centralized control device of the electrical part of the power station. This standard applies to ground electrical centralized control devices (hereinafter referred to as centralized control devices) installed in substations or power plants of different capacities in power systems and other industrial and mining enterprises.
This standard is the basis for the design, manufacture, testing, storage and transportation of centralized control devices and the formulation of product standards. This standard does not apply to local control devices integrated with primary equipment and circuit breakers directly controlled by computer keyboards. control device.
2 Reference standards
GB3047 Basic dimension series of panels, racks and cabinets GB2421 General principles for basic environmental testing procedures for electrical and electronic products GB4728 Graphical symbols for electrical diagrams
Packaging, storage and transportation pictorial markings| | tt | | GB191 | It operates centrally on the control panel (station) and centrally monitors the operation, measures the main operating parameters, alarms for abnormal situations, or is equipped with a complete set of electronic control devices with other automation functions. 3.2 One-to-one control mode One-to-one control mode Each control switch corresponds to a circuit breaker, and this control switch directly performs tripping and closing operations on this circuit breaker. 3.3 Line selection control mode Selective control mode pre-selects the circuit breaker in some way, and then uses a public trip and closing switch (button) to trip and close the circuit breaker. 4 Product Classification
4.1 Classification Principles
4.1.1 According to the circuit breaker control method, it is divided into: one-to-one control; line selection control. 4.1.2 According to the voltage level of the control loop, it is divided into: control loop with rated voltage above 60V is strong current control, rated voltage is 60V and approved by the State Bureau of Technical Supervision on 1989-12-21 and implemented on 1990-07-01
The following are weak current controls.
GB11920-—89
4.1.3 The components used to realize the functions are divided into: electromagnetic component type; semiconductor logic circuit type. 4.2 Structural dimensions
4.2.1 The overall dimensions of the screen (cabinet) should comply with the provisions of Article 1.4.1 of JB616. The size of the table is not specified yet. The recommended values ??for the width of each table of the spliced ??console are 800, 1000, and 1400mm. 4.2.2 The overall dimensions of the plug-in box should comply with the regulations of GB3047. 5 Technical Requirements
5.1 Basic functional requirements
5.1.1 The control panel and platform should have an analog wiring diagram that reflects the main wiring diagram, and there should be handle positions or lights that indicate the input or disconnection of the main equipment. show.
5.1.2 Manually put in the circuit breaker. Only one circuit breaker is allowed to be put in for each operation, and anti-jump measures should be taken. For systems with the possibility of non-synchronous closing, manual or automatic quasi-synchronous devices should be configured to ensure synchronization conditions when the circuit breaker is closed. 5.1.3 The capacity of the circuit breaker operating circuit contacts should ensure that the circuit breaker can trip and close reliably. 5.1.4 The device should have a complete signal warning system, including a warning signal system and an accident signal system. The accident signal system should be able to instantly send out audio signals and light up corresponding light signals to indicate the object and nature of the accident. The warning signal system should be able to delay (the time can be adjusted) or sound immediately, and there should be light signals to indicate the signal content. 5.1.5 The centralized control device should be equipped with necessary regular or optional measuring instruments, and the installation type, quantity and accuracy should be determined according to the characteristics of the controlled object. 5.2 Environmental conditions
5.2.1 Working environment conditions
Ambient temperature: 5~40℃;
a.
b. Relative humidity: 5%~95% ( Maximum absolute humidity 28g/m*); c. Atmospheric pressure: 86~108kPa; 66~108kPa. 5.2.2 Surrounding environment
No explosion hazard, no corrosive gases and conductive dust, no serious mold, and no sources of severe vibration and impact. There are dust-proof and anti-static measures. 5.2.3 Inclination
The floor where the equipment is installed should be smooth and smooth, and the inclination of the facade of the table or cabinet should not be greater than 5°. 5.2.4 Baseline environmental conditions
Environmental conditions when determining the basic performance and accuracy of the product or conducting arbitration tests: ambient temperature: 20±2℃;
a.
b.| |tt|| Relative humidity: 85%;
Atmospheric pressure: 86~108kPa.
c.
5.2.5 Normal test atmospheric conditions
a. Ambient temperature: 15～35℃;
b. Relative humidity: 45%～75%;
c.
Atmospheric pressure: 86~108kPa.
5.3 power supply
5.3.1 AC power supply
a.
Rated voltage, single-phase 220.V, three-phase 380V; allowable deviation 15%~+10% ;
b.
The waveform is sine wave, and the distortion is less than 5%; c.
The frequency is 50Hz, and the allowable deviation is ±5%.
d.
5.3.2 DC power supply
a.
b.
c.
rated voltage 48V, 110V, 220V ;
GB11920-89
The allowable deviation is -15%~+10% (when the battery is float charged and powered, the allowed deviation is +20%); the ripple coefficient is less than 5%.
5.4 DC signal rating for weak current measurement
5.4.1
5.4.2
When the centralized control device uses weak current measurement, the instrument input DC current rating is 4~ 20mA, 0~±1mA, 0~±10mA. When the centralized control device adopts weak current measurement, the instrument input DC voltage rating is 1~5V, 0±5V0~±10V. 5.5 Insulation resistance
5.5.1 The requirements for insulation resistance under normal test atmospheric conditions are shown in Table 1. Table 1
Rated insulation voltage U
V
U60
U>60
5.5.2
Table 2.
Insulation resistance requirements
MO
≥5 (use 250V megger)
≥5 (use 500V megohmmeter)
Hot and humid conditions ( The requirements for insulation resistance under temperature 40±2℃, relative humidity 90%~95%, atmospheric pressure 86~108kPa) are shown in Table 2
rated insulation voltage U,
V
U .60
U>60
5.6 Insulation strength
Insulation resistance requirements
MO
≥1 (with 250V megger)||tt| |≥1 (use 500V megger)
Under normal test atmospheric conditions, the tested part of the device should be able to withstand the 50Hz AC voltage specified in Table 3 for 1 minute insulation strength test without breakdown or flashover network phenomenon. Test location: between two independent circuits that are not electrically connected; between each live circuit and the metal casing. Table 3
Rated insulation voltage Ubzxz.net
U60
60
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