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First, the basic situation of the interlock protection system 1. Design principles (1) The trip system has an independent structure and is independent of the control and monitoring, and operates independently.
(2) In order to ensure the high reliability of the system, the machine, furnace, and electric protection are designed to be dual-channel, and any one of the channels will be operated and protected.
(3) The corresponding signal of each channel uses three to take two or two to take two logic (according to the requirements of different signals, such as stator water flow is low, use three to take two; low pressure cylinder exhaust temperature is high to use two to take two).
(4) The turbine protection is designed as two independent protection screens, corresponding to the A/B two trip passages of the turbine and implemented with relay logic.
(5) The boiler protection is designed as two separate protection screens, corresponding to the two A/B tripping channels of the boiler, and implemented with relay logic.
(6) The generator protection is designed as two separate protection screens, corresponding to the two A/B tripping channels of the generator, which are implemented with logic matrix and relay logic.
(7) The quality and type of the relays used are suitable for the quick and reliable requirements for completing the tripping task and comply with the BS142 standard.
(8) Any A/B channel is powered by a separate 110VDC battery.
(9) Turbine anti-water protection design Two independent protection screens are designed. The action signal is directly input to the main protection disk of the steam turbine, and the corresponding electric extraction isolation door and reverse check door of the N-90DCS system are used.
(10) The water level of the drum uses the water level gauge of the electrical contact and a separate control panel (A/B side) is designed. The action signal is directly sent to the A/B channel of the main protection of the boiler.
(11) Turbine TSI-related trip design Separate control panel (A/B channel), its action signal directly into the main protection of the A/B channel.
(12) Hydrogen temperature tripping of the generator The separate control panel (A/B channel) is designed and its action signal is directly fed into the A/B channel of the main protection of the turbine.
(13) Condenser vacuum tripping design a separate control panel (A/B channel), its action signal directly into the main protection of the A/B channel.
(14) Electric over-speed protection trip design Separate control panel (A/B channel), the action signal is directly into the main protection A/B channel of the turbine.
(15) All auxiliary equipment linkages are implemented in the subsystems of the DCS system.
(16) The signal used for each channel corresponds to the local independent measuring element, and the channels are not mixed (for example, the furnace pressure is high, corresponding to the three pressure switches of A channel, corresponding to the three pressure switches of B channel, a total of 6 pressures Switch, split furnace A / B side).
(17) Items 9 to 13 above all have a load test function and a load isolation function. When one channel is in the test position, the other channel still guarantees the tripping function.
2. The relationship between the machine, furnace, and electric interlock The operation signal of the A/B channel of the turbine and the main boiler protection is directly transmitted to the A/B channel corresponding to the main electrical protection, and the main protection disk is used to realize the machine, furnace, and electricity. Interlocking. For example, if the turbine trips, the main electrical protection is first performed, and the main protection of the main boiler is protected by the electrical main protection. Each main protection operates its own corresponding equipment (because the turbine has no bypass, the turbine and the generator must jump the boiler after tripping).
3. Tripping of tripping is divided into two levels. The first level is an instantaneous trip, which is considered an emergency trip for electrical; the second level is considered an electrical emergency trip. See Tables 1 to 5. 
4. Main differences from domestic popular design (1) The machine, furnace and electricity interlocking of Yueyang Power Plant is centered on electrical protection, which is different from the popular domestic design centered on turbine protection.
(2) The boiler is not designed for full fire protection. In the design liaison with the British side, China insisted on increasing this design, but the British side strongly disagreed. There are three reasons for this: 1 It is the heavy protection of the W flame; 2 The furnace space is large; 3 The furnace pressure switch can indicate the fire extinguishing situation in this case.
(3) Emphasis is placed on the vacuum of the condenser, which is reflected in both primary and secondary protection.
(4) For TSI equipment related trip signals, such as eccentricity, differential expansion, etc., not directly into the turbine protection, but there are alarm and recommended trip value; only vibration, thrust bearing wear large trip signal directly into the turbine protection.
II. Overall evaluation The main protection system of Huaneng Yueyang Power Plant unit is a typical design of the British GEC Corp. in the late 1980s. The design is simple and clear. From the design drawings, this solution has been applied in many units and is a mature design solution. The mainstream design of the unit main protection system is now generally implemented by the DCS system. However, no matter what kind of system is used to achieve the main protection function of the unit, the purpose is only one, that is, correct and reliable, not only refused to move, but also to avoid misuse. From the current operating situation, this system is quite reliable, especially since the last three years, there has been no mistake.
Two 362.5MW turbines of Huaneng Yueyang Power Plant are produced by GEC ALSTHOM of the United Kingdom. They are subcritical intermediate reheating, single-shaft and three-cylinder, condensing impulse steam turbines. The boilers are produced by British BABCOCKENERGY LIMITED, which is a single drum, single furnace, and balanced ventilation. , natural circulation, subcritical, intermediate reheat, coal-fired open-air boilers, W type flame, maximum continuous output 1160t/h; generator produced by British GECALSTHOM, using water-cooled stator windings, direct hydrogen cooled rotor windings and stator cores The power is 362,500 kW.