CN111817187A - Nuclear power plant voltage stabilizer electric heater switch cooling device and control method thereof - Google Patents

Nuclear power plant voltage stabilizer electric heater switch cooling device and control method thereof Download PDF

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Publication number
CN111817187A
CN111817187A CN202010691602.1A CN202010691602A CN111817187A CN 111817187 A CN111817187 A CN 111817187A CN 202010691602 A CN202010691602 A CN 202010691602A CN 111817187 A CN111817187 A CN 111817187A
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China
Prior art keywords
relay
switch
electric heater
cooling device
loop
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CN202010691602.1A
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CN111817187B (en
Inventor
李洪伟
徐霞军
郭莉侠
张志国
王雄辉
王亚东
吴东方
王镜淇
翁铖忠
徐广建
司旭东
李维国
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Jiangsu Nuclear Power Corp
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Jiangsu Nuclear Power Corp
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Priority to CN202010691602.1A priority Critical patent/CN111817187B/en
Publication of CN111817187A publication Critical patent/CN111817187A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/56—Cooling; Ventilation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/52—Cooling of switch parts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/56—Cooling; Ventilation
    • H02B1/565—Cooling; Ventilation for cabinets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Thermally Actuated Switches (AREA)

Abstract

The invention belongs to the technical field of nuclear power station electricity, and particularly relates to a nuclear power plant voltage stabilizer electric heater switch cooling device and a control method thereof, wherein the control method comprises the following steps: the power supply lead circuit comprises a power supply lead circuit I, a primary circuit II and a secondary circuit; the secondary circuit includes: the cooling device of the voltage stabilizer electric heater is connected with a switching-in/switching-out loop III, a fan operation control loop IV, an alarm loop V and a secondary loop; the invention controls the switch cooling device to be switched on or off by using the auxiliary contact of the main contactor in the electric heater switch, can realize the starting operation of any electric heater switch in a row of switch cabinets, automatically starts the cooling device on the row of switch cabinets, accelerates the air flow in the switch cabinets, and effectively reduces the operating temperature in the electric heater switch of the voltage stabilizer.

Description

Nuclear power plant voltage stabilizer electric heater switch cooling device and control method thereof
Technical Field
The invention belongs to the technical field of electrical maintenance of nuclear power plants, and particularly relates to a switch cooling device of an electric heater of a voltage stabilizer of a nuclear power plant and a control method thereof.
Background
A loop of each unit of a No. 1 and No. 2 unit of a certain nuclear power plant is provided with 1 voltage stabilizer, and the voltage stabilizer has the main function of establishing and maintaining loop pressure during the startup period of a reactor device. Each voltage stabilizer is provided with 28 electric heaters, and the electric heaters have the following functions:
1) heating a coolant of a primary circuit together with a main pump during startup of the reactor apparatus while making a cooling temperature of the primary circuit in the pressurizer correspond to a saturation temperature at a pressure of the pressurizer;
2) when the pressure of a primary circuit is reduced during the operation of the reactor, the electric heater is automatically switched on to lift and maintain the pressure of the primary circuit.
In the design of a power supply system of 28 electric heaters, each electric heater is provided with a set of independent electric power supply circuits, the 28 electric power supply circuits are completely identical, each electric power supply circuit is a drawer type switch, and the switch types are completely identical.
28 electric heater switches are designed on two sections of alternating current buses, and the arrangement of each section of bus switch is completely the same. As shown in fig. 2, each bus bar is divided into four rows of switch cabinets. The first row of switch cabinets are power supply incoming switches, and the second, third and fourth rows are load switch cabinets. 9 switch interval drawers are designed on each row of load switch cabinets, the lowest switch interval drawer in the 9 switch interval drawers is a standby switch interval drawer, 4 or 5 switch interval drawers at the bottom of the standby switch interval drawer upwards are electric heater electric switches, the switches are stacked up and down adjacently, and 4 or 3 interval standby switch interval drawers are arranged at the upper part of the electric heater switch at the uppermost layer.
Over a decade of operation, the switches of voltage regulator electric heaters have many burnout failures. In order to find out the cause of the fault and eliminate the hidden trouble, a technician uses an infrared imager to actually measure the internal temperature of each electric heater switch during the operation of 28 electric heaters, and finds that: the highest temperature inside different electric heater switches is different, the temperature is higher on the whole, the internal temperature of 4-5 switches in the same column is also greatly different between 80-120 ℃, the internal temperature difference between the uppermost switch and the lowermost switch is 20 ℃, and the maximum temperature difference is close to 40 ℃.
Therefore, in order to reduce the operating temperature of the switch of the electric heater of the voltage stabilizer, improve the reliability of the switch operation, ensure the safe and stable operation of the electric heater of the voltage stabilizer, and ensure the safe operation of the unit, it is necessary to design a cooling device for the switch of the electric heater of the voltage stabilizer and a control method thereof to solve the above technical problems.
Disclosure of Invention
The invention aims to design a cooling device for a switch of an electric heater of a voltage stabilizer in a nuclear power plant and a control method thereof, which are used for effectively solving the technical problem that the safe operation of a unit is endangered by the overhigh operation temperature of the switch of the electric heater of the voltage stabilizer.
The technical scheme of the invention is as follows:
a nuclear power plant regulator electric heater switch cooling apparatus comprising: the power supply lead circuit comprises a power supply lead circuit I, a primary circuit II and a secondary circuit; the secondary circuit includes: the cooling device of the voltage stabilizer electric heater is connected with a switching-in/switching-out loop III, a fan operation control loop IV, an alarm loop V and a secondary loop;
a terminal row X02 is arranged on the power lead;
a relay K5 is arranged in the voltage stabilizer electric heater cooling device input/output loop III, and the relay K5 comprises: a normally open contact K5-1 of the relay K5 and a normally closed contact K5-2 of the relay K5; the secondary circuit coupling link includes: a control loop power switch Q1 and a relay K5 normally open contact K5-1; the fan operation control loop IV is connected to a voltage stabilizer electric heater cooling device input/exit loop III through a relay K5 normally open contact K5-1;
the input/exit loop III of the cooling device of the voltage stabilizer electric heater is connected to the primary loop II through a control loop power switch Q1;
the power supply lead circuit I is connected with the primary circuit II through a terminal row X02;
the power supply leading loop I provides 230V alternating current power supply for a primary loop II, a voltage stabilizer electric heater cooling device input/exit loop III and a fan operation control loop IV;
the alarm circuit V is connected to a remote alarm circuit through a terminal row X10, and the terminal row X10 is arranged on a voltage stabilizer electric heater switch cooling cabinet;
the power supply leading loop I comprises: the a-phase alternating-current bus L1, the B-phase alternating-current bus L2, the C-phase alternating-current bus L3, the neutral line N, the primary plug X01 and the terminal block X02, and the a-phase alternating-current bus L1 is led to the terminal block X02 through the primary plug X01.
The primary circuit II comprises: the main switch Q0 and a plurality of fan running branches connected in parallel, wherein the upper port of the main switch Q0 is connected with a terminal row X02 of a power supply leading loop I; the lower port of the main switch Q0 is connected with a plurality of parallel fan running branches; the number of the plurality of parallel fan operation branches is more than or equal to one. The number of the parallel fan operation branches is related to the size of the position arrangement space of the electric elements in the electric heater switch cooling device.
Each fan operation branch road in a plurality of parallelly connected fan operation branch road all includes: the fan electric protection switch, the normally open contact of the fan operation control contactor and the fan;
the upper port of the fan electric protection switch in each fan operation branch is connected into the lower port of the main switch Q0 in parallel;
the lower port of the fan electrical protection switch in each fan operation branch is respectively connected with one end of a normally open contact of the corresponding fan operation control contactor, the other end of the normally open contact of the fan operation control contactor is connected with one end of the fan, and the other end of the fan is connected with the zero line N.
The input/output loop III of the cooling device of the electric heater of the voltage stabilizer is connected to a primary loop II through a control loop power switch Q1, the upper port of the control loop power switch Q1 is connected to the primary loop II, and the lower port of the control loop power switch Q1 is connected to the input/output loop III of the cooling device of the electric heater of the voltage stabilizer.
The voltage stabilizer electric heater cooling device input/exit loop III comprises: a closing button S1, a trip button S2, a relay K2, a relay K5, a cooling device input indicator lamp H1 and a cooling device exit indicator lamp H2;
the relay K5 is connected with the relay K2 in parallel;
the relay K2 further includes: a normally open contact K2-1 of a relay K2, a normally open contact K2-2 of a relay K2 and a normally closed contact K2-3 of a relay K2; one end contact of the closing button S1 is connected with the lower port of the control loop power switch Q1, the other end contact of the closing button S1 is connected with one end contact of the tripping button S2, the other end contact of the tripping button S2 is connected with one end of a coil of a relay K2, and the other end of the coil of the relay K2 is connected with a zero line N;
the normally open contact K2-1 of the relay K2 is connected with a closing button S1 in parallel;
one end of a normally open contact K2-2 of the relay K2 is connected to the lower port of a control loop power switch Q1, the other end of the normally open contact K2-2 of the relay K2 is connected with one end of a cooling device input indicator lamp H1, and the other end of H1 is connected to a zero line N;
one end of a normally closed contact K2-3 of the relay K2 is connected to the lower port of a control loop power switch Q1, the other end of the normally closed contact K2-3 of the relay K2 is connected with one end of a cooling device exit indicator lamp H2, and the other end of H2 is connected to a neutral wire N.
One end of a normally open contact K5-1 of the relay K5 is connected to a voltage stabilizer electric heater cooling device input/exit loop III, and the other end of a normally open contact K5-1 of the relay K5 is connected to a fan operation control loop IV;
the fan operation control loop IV comprises: an electric heater switch main contactor normally closed contact K1, an electric heater switch main contactor normally closed contact K1 ', an electric heater switch main contactor normally closed contact K1 ", an electric heater switch main contactor normally closed contact K1 ', an electric heater switch main contactor normally closed contact K1 ', a relay K6, a fan operation control contactor K3 and a fan operation control contactor K4;
the normally closed contact K1 of the electric heater switch main contactor, the normally closed contact K1 'of the electric heater switch main contactor, the normally closed contact K1' of the electric heater switch main contactor, the normally closed contact K1 '″ of the electric heater switch main contactor and the normally closed contact K1' of the electric heater switch main contactor are sequentially connected in series, one end of a K1, K1 ', K1', K1 ', K1' series branch is connected with the normally open contact K5-1 of the relay K5, the other end of the K1, K1 ', K1', K1 ', K1' series branch is connected with one end of the relay K6, and the other end of the relay K6 is connected with a neutral line N;
the relay K6 further comprises a relay K6 normally closed contact K6-1; one end of a relay K6 normally closed contact K6-1 is connected with a relay K5 normally open contact K5-1, the other end of the relay K6 normally closed contact K6-1 is connected with one end of a fan operation control contactor K3, the other end of the fan operation control contactor K3 is connected with a zero line N, and the fan operation control contactor K4 is connected with a fan operation control contactor K3 in parallel.
The alarm loop V comprises: a relay K5 normally closed contact K5-2 and an interlocking contact of each fan electric protection switch, wherein the interlocking contact of each fan electric protection switch is connected in parallel and outputs to a terminal row X10; the terminal row X10 includes: terminal row X10: 10 connection terminal and terminal row X10: 11 connecting terminals.
A method of controlling a nuclear power plant regulator electric heater switch cooling arrangement as claimed in any preceding claim, comprising the steps of:
the method comprises the following steps: the cooling device is connected to an alternating current bus L1 through a primary plug X01, a 230V alternating current power supply is introduced, and power is supplied to a primary loop II of the cooling device, a voltage stabilizer electric heater cooling device input/exit loop III and a fan operation control loop IV through a main switch Q0;
step two: when a closing button S1 is pressed, a relay K2 and a relay K5 are electrified, a normally open contact K5-1 of the relay K5 is closed, and a fan operation control loop IV is electrified; a normally open contact K2-1 of a relay K2 connected with the contact of the closing button S1 in parallel is closed, and a relay K2 is self-maintained in a charged state;
meanwhile, a normally open contact K2-2 of the relay K2 is closed, an electric loop of a cooling device indicator lamp H1 is connected, the cooling device indicator lamp H1 is lightened, and the cooling device is indicated to be in an input state;
step three: when the tripping button S2 is pressed, the relay K2 and the relay K5 lose power, the normally open contact K5-1 of the relay K5 is disconnected, and the fan operation control loop IV is powered off; meanwhile, a normally closed contact K2-3 of the relay K2 is closed, an electric loop of a cooling device indicator lamp H2 is switched on, and a cooling device indicator lamp H2 is lightened to indicate that the cooling device is in an exit state;
the closing button S1, the trip button S2, the relay K2 and the relay K5 are used for controlling the input or exit of the cooling device and preventing the arc discharge phenomenon at the primary plug part when a load is pushed into or pulled out of the switch;
step four: when a maintenance person needs to maintain the cooling device, the trip button S2 is pressed, the device is quitted from operation, and the maintenance person can directly pull out the switch drawer to maintain the cooling device;
step five: when any one electric heater switch in a load switch cabinet in a row is used, the normally closed contacts K1, K1 ', K1 ", K1'", K1 "" of the main contactor corresponding to the electric heater switch are disconnected, so that the coil of the relay K6 is de-energized, meanwhile, the normally closed contact K6-1 of the relay K6 is closed, so that the coils of the fan operation control contactors K3 and K4 are electrified, normally open contacts of the fan operation control contactors K3 and K4 in the primary circuit II are closed, and the branch fans are electrified to operate;
when all electric heater switches in a row of switch cabinets are not put into use, normally closed contacts K1, K1 ', K1 ", K1'", K1 "" of main contactors of all electric heater switches are closed, coils of a relay K6 are electrified, a normally closed contact K6-1 of a relay K6 is opened, coils of the fan operation control contactors K3 and K4 are powered off, normally open contacts are opened, and fans of all branches are stopped;
step six: the state contact of each branch fan electric protection switch is connected with the normally closed contact of the relay K5 in parallel and output to the terminals 10 and 11 of the terminal row X10, when any fan electric protection switch is not switched on or switched off or the cooling device is withdrawn, the terminal row X10 of the alarm circuit V outputs a passive closed contact signal and sends a remote alarm signal.
The invention has the beneficial effects that:
the invention designs a cooling device of an electric heater switch of a voltage stabilizer in a nuclear power plant and a control method thereof. A switch cooling device is arranged in the spare switch interval drawer next to the electric heater switch at the uppermost part of each row of load switch cabinets.
The switch cooling device of the electric heater of the voltage stabilizer, which is designed by the invention, can achieve the following effects:
1) any electric heater switch in a row of switch cabinets is started to operate, and a cooling device on the row of switch cabinets is automatically started to accelerate the air flow in the switch cabinets and effectively reduce the operating temperature in the electric heater switch of the voltage stabilizer.
2) The heat emitted from the inside of the switch can be dissipated in time by accelerating the air flow. The vicious circle formed by the temperature rise inside the switch is avoided (temperature rise → increase of the direct resistance of the primary circuit → increase of the heat generation amount → temperature rise).
3) Through accelerating the air flow, reduce the inside temperature of switch, can avoid the switch to generate heat and arouse the switch to burn out the trouble, reduce the switch and burn out the trouble and probably cause the risk that the alternating current bus loses electricity.
4) The spare space on the switch cabinet is additionally provided with drawers, and a cooling device is arranged. The cooling device is simple in design, a power supply does not need to be introduced from the outside, and electricity is directly taken at the bus through one-time insertion of the drawer of the cooling device.
5) All parts of the cooling device are general electric elements, the modification cost is low, and the cooling effect in practical application is obvious.
6) In order to facilitate maintenance, the switch panel is provided with a closing button and a breaking button which can control the cooling device to be put in or withdrawn, and after the device is withdrawn from operation, the switch drawer can be directly pulled out to maintain the cooling device.
7) When any fan in the cooling device fails, any switch is not switched on or the cooling device is not put into operation, the cooling device automatically sends a remote alarm signal, so that the operation state of the cooling device is effectively monitored, and the cooling device in a failure state can be maintained in time.
Drawings
FIG. 1 is a schematic circuit diagram of an embodiment of a nuclear power plant regulator electric heater switch cooling apparatus of the present invention having four parallel fan operating branches;
fig. 2 is an overall schematic diagram of a regulator electric heater switch according to the present invention.
Wherein: 1-a first column of switchgear; 2-a second column of switchgear; 3-a third column of switchgear cabinets;
4-fourth column of switchgear; 5-power incoming line switch; 6-spare switch spacing drawer;
7-electric heater switch interval drawer; 8-electric heater switch cooling means;
L1-A AC bus; L2-B AC bus; L3-C AC bus; an N-zero line;
q0-main switch; q1-control loop power switch; Q2-Electrical protection switch for Fan M1;
Q3-Electrical protection switch for Fan M2; Q4-Electrical protection switch for Fan M3;
Q5-Electrical protection switch for Fan M4;
k1, K1 ', K1 ", K1"', K1 "" -electric heater switch normally closed contacts of the main contactor;
k2, K5-control relay for switching in or out of cooling device; K6-Relay;
k3, K4-Fan operation control contactors; s1-closing button; s2-trip button;
H1-Cooling device input indicator light; h2 — cooling device exit indicator light;
x01-first insertion; x02, X10-terminal rows;
i, a power supply leading loop; II, a primary loop;
III-putting in/out loop of cooling device of electric heater of voltage stabilizer;
IV-a fan operation control loop; v-alarm loop
Detailed Description
The invention will be further described by taking four parallel fan operation branches as an embodiment with reference to the accompanying drawings:
as shown in fig. 1, a nuclear power plant regulator electric heater switch cooling apparatus includes: the power supply is connected with a loop I, a primary loop II and a secondary loop. The secondary circuit includes: the cooling device of the voltage stabilizer electric heater is connected with a switching-in/switching-out loop III, a fan operation control loop IV, an alarm loop V and a secondary loop.
The secondary circuit connecting link comprises a control circuit power switch Q1 and a relay K5 normally open contact K5-1. The fan operation control loop IV is connected to a voltage stabilizer electric heater cooling device input/exit loop III through a normally open contact K5-1 of a relay K5; the input/exit loop III of the cooling device of the voltage stabilizer electric heater is connected to the primary loop II through a control loop power switch Q1;
the power supply lead circuit I is connected with the primary circuit II through a terminal row X02;
the power supply leading loop I provides 230V alternating current power supply for a primary loop II, a voltage stabilizer electric heater cooling device input/exit loop III and a fan operation control loop IV;
the power supply leading loop I comprises: an A-phase alternating current bus L1, a B-phase alternating current bus L2, a C-phase alternating current bus L3, a neutral line N, a primary plug X01 and a terminal block X02, wherein the A-phase alternating current bus L1 is connected to the terminal block X02 through the primary plug;
the primary loop II comprises: the main switch Q0 and four fan operation branches connected in parallel, wherein the upper port of the main switch Q0 is connected to a terminal row X02 of a power supply leading loop I; the other end of the main switch Q0 is connected to four parallel fan operating branches.
The four parallel fan operation branches comprise: a fan M1 electric protection switch Q2, a fan M2 electric protection switch Q3, a fan M3 electric protection switch Q4, a fan M4 electric protection switch Q5, a fan operation control contactor K3 normally open contact K3-1, a fan operation control contactor K3 normally open contact K3-2, a fan operation control contactor K4 normally open contact K4-1, a fan operation control contactor K4 normally open contact K4-2, a fan M1, a fan M2, a fan M3 and a fan M4;
the upper ports of the fan M1 electrical protection switch Q2, the fan M2 electrical protection switch Q3, the fan M3 electrical protection switch Q4 and the fan M4 electrical protection switch Q5 are connected into the lower port of the main switch Q0.
The lower port of an electric protection switch Q2 of the fan M1 is connected with one end of a normally open contact K3-1 of a contactor K3, the other end of K3-1 is connected with one end of a fan M1, and the other end of the fan M1 is connected with a zero line N;
the lower port of an electric protection switch Q3 of the fan M2 is connected with one end of a normally open contact K3-2 of a contactor K3, the other end of the K3-2 is connected with one end of a fan M2, and the other end of the fan M2 is connected with a zero line N;
the lower port of an electric protection switch Q4 of the fan M3 is connected with one end of a normally open contact K4-1 of a contactor K4, the other end of the K4-1 is connected with one end of a fan M3, and the other end of the fan M3 is connected with a zero line N;
the lower port of an electric protection switch Q5 of the fan M4 is connected with one end of a normally open contact K4-2 of a contactor K4, the other end of the K4-2 is connected with one end of a fan M4, and the other end of the fan M4 is connected with a neutral wire N.
The input/output loop III of the cooling device of the voltage stabilizer electric heater is connected to the primary loop II through a control power switch Q1; the upper port of the control power switch Q1 is connected to the lower port of a primary circuit II main switch Q0, and the lower port of Q1 is connected to a voltage stabilizer electric heater cooling device input/exit circuit III;
the voltage stabilizer electric heater cooling device input/exit loop III comprises: a closing button S1, a trip button S2, a relay K2, a relay K5, a cooling device input indicator lamp H1 and a cooling device exit indicator lamp H2;
the relay K5 is connected with the relay K2 in parallel;
the relay K2 further includes: a normally open contact K2-1 of a relay K2, a normally open contact K2-2 of a relay K2 and a normally closed contact K2-3 of a relay K2; one end contact of the closing button S1 is connected with the lower port of the control loop power switch Q1, the other end contact of the closing button S1 is connected with one end contact of the tripping button S2, the other end contact of the tripping button S2 is connected with one end of a coil of a relay K2, and the other end of the coil of the relay K2 is connected with a zero line N;
the normally open contact K2-1 of the relay K2 is connected with a closing button S1 in parallel;
one end of a normally open contact K2-2 of the relay K2 is connected to the lower port of a control loop power switch Q1, the other end of the normally open contact K2-2 of the relay K2 is connected with one end of a cooling device input indicator lamp H1, and the other end of H1 is connected to a zero line N;
one end of a normally closed contact K2-3 of the relay K2 is connected to the lower port of a control loop power switch Q1, the other end of the normally closed contact K2-3 of the relay K2 is connected with one end of a cooling device exit indicator lamp H2, and the other end of H2 is connected to a neutral wire N.
The relay K5 further includes: a normally open contact K5-1 of the relay K5 and a normally closed contact K5-2 of the relay K5;
the fan operation control loop IV is connected to a voltage stabilizer electric heater cooling device input/exit loop III through a normally open contact K5-1 of a relay K5; one end of a normally open contact K5-1 of the relay K5 is connected to a voltage stabilizer electric heater cooling device input/exit loop III, and the other end of a normally open contact K5-1 of the relay K5 is connected to a fan operation control loop IV;
the fan operation control loop IV comprises: an electric heater switch main contactor normally closed contact K1, an electric heater switch main contactor normally closed contact K1 ', an electric heater switch main contactor normally closed contact K1 ", an electric heater switch main contactor normally closed contact K1 ', an electric heater switch main contactor normally closed contact K1 ', a relay K6, a fan operation control contactor K3 and a fan operation control contactor K4;
the normally closed contact K1 of the electric heater switch main contactor, the normally closed contact K1 'of the electric heater switch main contactor, the normally closed contact K1' of the electric heater switch main contactor, the normally closed contact K1 '″ of the electric heater switch main contactor and the normally closed contact K1' of the electric heater switch main contactor are sequentially connected in series, one end of a K1, K1 ', K1', K1 ', K1' series branch is connected with the normally open contact K5-1 of the relay K5, the other end of the K1, K1 ', K1', K1 ', K1' series branch is connected with one end of the relay K6, and the other end of the relay K6 is connected with a neutral line N;
the relay K6 further comprises a relay K6 normally closed contact K6-1; one end of a normally closed contact K6-1 of the relay K6 is connected with a normally open contact K5-1 of the relay K5, the other end of the normally closed contact K6K 6-1 is connected with one end of a coil of a fan operation control contactor K3, the other end of the coil of the fan operation control contactor K3 is connected with a zero line N, and the fan operation control contactor K4 is connected with a coil of a fan operation control contactor K3 in parallel.
The alarm loop V is connected to a remote alarm loop through a terminal row X10;
the alarm circuit V comprises: a relay K5 normally closed contact K5-2, a fan M4 electric protection switch Q5 linkage contact Q5-1, a fan M3 electric protection switch Q4 linkage contact Q4-1, a fan M2 electric protection switch Q3 linkage contact Q3-1 and a fan M1 electric protection switch Q2 linkage contact Q2-1, wherein the contacts are connected in parallel and output to a terminal row X10;
the terminal row X10 includes: terminal row X10: 10 connection terminal and terminal row X10: 11 connecting terminals.
A method of controlling a nuclear power plant regulator electric heater switch cooling arrangement as claimed in any preceding claim, comprising the steps of:
the method comprises the following steps: the cooling device is connected to an alternating current bus L1 through a primary plug X01, a 230V alternating current power supply is introduced, and power is supplied to a primary loop II of the cooling device, a voltage stabilizer electric heater cooling device input/exit loop III and a fan operation control loop IV through a main switch Q0;
step two: when a closing button S1 is pressed, a relay K2 and a relay K5 are electrified, a normally open contact K5-1 of the relay K5 is closed, and a fan operation control loop IV is electrified; a normally open contact K2-1 of a relay K2 connected with the contact of the closing button S1 in parallel is closed, and a relay K2 is self-maintained in a charged state;
meanwhile, a normally open contact K2-2 of the relay K2 is closed, an electric loop of a cooling device indicator lamp H1 is connected, the cooling device indicator lamp H1 is lightened, and the cooling device is indicated to be in an input state;
step three: when the tripping button S2 is pressed, the relay K2 and the relay K5 lose power, the normally open contact K5-1 of the relay K5 is disconnected, and the fan operation control loop IV is powered off; meanwhile, a normally closed contact K2-3 of the relay K2 is closed, an electric loop of a cooling device indicator lamp H2 is switched on, and a cooling device indicator lamp H2 is lightened to indicate that the cooling device is in an exit state;
the closing button S1, the trip button S2, the relay K2 and the relay K5 are used for controlling the input or exit of the cooling device and preventing the arc discharge phenomenon at the primary plug part when a load is pushed into or pulled out of the switch;
step four: when a maintenance person needs to maintain the cooling device, the trip button S2 is pressed, the device is quitted from operation, and the maintenance person can directly pull out the switch drawer to maintain the cooling device;
step five: when any electric heater in a load switch cabinet in a row is used, normally closed contacts K1, K1 ', K1 ", K1'", K1 "" of an electric heater main contactor corresponding to the electric heater are disconnected, so that a coil of a relay K6 is de-energized, a normally closed contact K6-1 of a relay K6 is closed, coils of fan operation control contactors K3 and K4 are electrified, normally open contacts of the fan operation control contactors K3 and K4 are closed, and branch fans are electrified to operate simultaneously;
when all electric heaters in a switch cabinet are not used, normally closed contacts K1, K1 ', K1 ", K1'", K1 "" of a main contactor of all electric heaters are closed, a coil of a relay K6 is electrified, a normally closed contact K6-1 of a relay K6 is opened, coils of contactors K3 and K4 are controlled to be powered off by fan operation, normally open contacts are opened, and fans of all branches are stopped;
step six: the state contact of the fan electric protection switch is connected with the normally closed contact of the relay K5 in parallel and is output to the terminals 10 and 11 of the terminal row X10, when any fan electric protection switch is not switched on or switched off or the cooling device is withdrawn, the terminal row X10 of the alarm circuit V outputs a passive closed contact signal and sends a remote alarm signal;
the specific operation of the examples is described as follows:
l1, L2 and L3 are three-phase alternating current buses of the bus section, the cooling device is connected to an alternating current bus L1(A phase, 230V) through a drawer switch primary plug X01 to introduce a 230V alternating current power supply, and a primary loop II of the cooling device, a voltage stabilizer electric heater cooling device input/exit loop III and a fan operation control loop IV are supplied with power through a main switch Q0.
The lower part of the primary loop is divided into 4 branches, and each branch is respectively provided with an electric protection switch Q2, a Q3, a Q4 and a Q5; the electric protection switches Q2, Q3, Q4 and Q5 are used for protecting and tripping the switches when the fans in the branch circuit have faults, and disconnecting the fault branch circuit to ensure the normal operation of the fans of other branch circuits.
The closing or opening of the fan operation control contactors K3, K4 directly controls the operation or stop of the fans M1, M2, M3, M4. A closing button S1, a trip button S2, a cooling device input indicator lamp H1 and a cooling device exit indicator lamp H2 are designed on a drawer switch panel of the cooling device.
The 230V control power supply is introduced into the input/exit loop III of the cooling device of the voltage stabilizer electric heater through a control power switch Q1, a closing button S1 is pressed, a relay K2 and a relay K5 are electrified, a normally open contact K5-1 of the relay K5 is closed, and a fan operation control loop IV is electrified. The normally open contact K2-1 of the relay K2 which is connected with the contact of the closing button S1 in parallel is closed, and the relay K2 is self-maintained in a charged state.
Meanwhile, a normally open contact K2-2 of the relay K2 is closed, an electric circuit of the cooling device indicator lamp H1 is connected, the cooling device indicator lamp H1 is lightened, and the cooling device is indicated to be in an on state.
When the tripping button S2 is pressed, the relay K2 and the relay K5 lose power, the normally open contact K5-1 of the relay K5 is disconnected, and the fan operation control loop IV is powered off. Meanwhile, a normally closed contact K2-3 of the relay K2 is closed, an electric circuit of a cooling device indicator lamp H2 is connected, and a cooling device indicator lamp H2 is lightened to indicate that the cooling device is in a quitting state.
The closing button S1, the trip button S2, the relay K2 and the relay K5 are used for controlling the input or the exit of the cooling device, and the arc discharge phenomenon at a primary plug part when a load is pushed in or pulled out of the switch can be prevented.
When the maintenance personnel need to maintain the cooling device, the trip button S2 is pressed, the device is withdrawn from operation, and the maintenance personnel can directly pull out the switch drawer to maintain the cooling device.
The normally closed contacts K1, K1 ', K1', K1 ', K1' are auxiliary contacts of a main contactor of a switching device of a voltage stabilizer electric heater in a load switch cabinet row where the cooling device is located.
The contact signals formed by connecting normally open contacts of all electric heater main contactors in series in a row of load switch cabinets form the necessary condition for starting and stopping the cooling device, when any electric heater in the row of load switch cabinets is used, normally closed contacts K1, K1 ', K1', K1 ', K1' of the electric heater main contactor corresponding to the electric heater are disconnected, a coil of a relay K6 is de-energized, a normally closed contact K6-1 of a relay K6 is closed, coils of fan operation control contactors K3 and K4 are energized, normally open contacts K3-1, K3-2, K4-1 and K4-2 of the fan operation control contactors K3 and K4 are closed, and fans M1, M2, M3 and M4 are energized.
When all electric heaters in a switch cabinet are not used, normally closed contacts K1, K1 ', K1 ", K1"', K1 "" of all electric heater switch main contactors are closed, a coil of a relay K6 is electrified, a normally closed contact K6-1 of a relay K6 is opened, coils of fan operation control contactors K3 and K4 are powered off, a normally open contact is opened, and fans M1, M2, M3 and M4 are stopped.
The state contacts of the switches Q2, Q3, Q4 and Q5 are connected in parallel with the normally closed contact of the relay K5 and output to the terminals 10 and 11 of the terminal row X10, and when the protection switch Q2, the protection switch Q3, the protection switch Q4 and the protection switch Q5 are not switched on or switched off or the cooling device is withdrawn, the terminal row X10 of the alarm loop V outputs a passive closed contact signal and sends a remote alarm signal.
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.

Claims (8)

1. A nuclear power plant regulator electric heater switch cooling apparatus, comprising: the power supply lead circuit comprises a power supply lead circuit I, a primary circuit II and a secondary circuit; the secondary circuit includes: the cooling device of the voltage stabilizer electric heater is connected with a switching-in/switching-out loop III, a fan operation control loop IV, an alarm loop V and a secondary loop;
a terminal row X02 is arranged on the power lead;
a relay K5 is arranged in the voltage stabilizer electric heater cooling device input/output loop III, and the relay K5 comprises: a normally open contact K5-1 of the relay K5 and a normally closed contact K5-2 of the relay K5; the secondary circuit coupling link includes: a control loop power switch Q1 and a relay K5 normally open contact K5-1; the fan operation control loop IV is connected to a voltage stabilizer electric heater cooling device input/exit loop III through a relay K5 normally open contact K5-1;
the input/exit loop III of the cooling device of the voltage stabilizer electric heater is connected to the primary loop II through a control loop power switch Q1;
the power supply lead circuit I is connected with the primary circuit II through a terminal row X02;
the power supply leading loop I provides 230V alternating current power supply for a primary loop II, a voltage stabilizer electric heater cooling device input/exit loop III and a fan operation control loop IV;
the alarm circuit V is connected to a remote alarm circuit through a terminal row X10, and the terminal row X10 is arranged on a voltage stabilizer electric heater switch cooling cabinet.
2. The nuclear power plant regulator electric heater switch cooling arrangement of claim 1, wherein: the power supply leading loop I comprises: the a-phase alternating-current bus L1, the B-phase alternating-current bus L2, the C-phase alternating-current bus L3, the neutral line N, the primary plug X01 and the terminal block X02, and the a-phase alternating-current bus L1 is led to the terminal block X02 through the primary plug X01.
3. The nuclear power plant regulator electric heater switch cooling arrangement of claim 2, wherein: the primary circuit II comprises: the main switch Q0 and a plurality of fan running branches connected in parallel, wherein the upper port of the main switch Q0 is connected with a terminal row X02 of a power supply leading loop I; the lower port of the main switch Q0 is connected with a plurality of parallel fan running branches; the number of the plurality of parallel fan running branches is more than or equal to one;
each fan operation branch road in a plurality of parallelly connected fan operation branch road all includes: the fan electric protection switch, the normally open contact of the fan operation control contactor and the fan;
the upper port of the fan electric protection switch in each fan operation branch is connected into the lower port of the main switch Q0 in parallel;
the lower port of the fan electrical protection switch in each fan operation branch is respectively connected with one end of a normally open contact of the corresponding fan operation control contactor, the other end of the normally open contact of the fan operation control contactor is connected with one end of the fan, and the other end of the fan is connected with the zero line N.
4. A nuclear power plant regulator electric heater switch cooling arrangement as claimed in claim 3, further comprising: the input/output loop III of the cooling device of the electric heater of the voltage stabilizer is connected to a primary loop II through a control loop power switch Q1, the upper port of the control loop power switch Q1 is connected to the primary loop II, and the lower port of the control loop power switch Q1 is connected to the input/output loop III of the cooling device of the electric heater of the voltage stabilizer.
5. The nuclear power plant regulator electric heater switch cooling arrangement of claim 4, wherein: the voltage stabilizer electric heater cooling device input/exit loop III comprises: a closing button S1, a trip button S2, a relay K2, a relay K5, a cooling device input indicator lamp H1 and a cooling device exit indicator lamp H2;
the relay K5 is connected with the relay K2 in parallel;
the relay K2 further includes: a normally open contact K2-1 of a relay K2, a normally open contact K2-2 of a relay K2 and a normally closed contact K2-3 of a relay K2; one end contact of the closing button S1 is connected with the lower port of the control loop power switch Q1, the other end contact of the closing button S1 is connected with one end contact of the tripping button S2, the other end contact of the tripping button S2 is connected with one end of a coil of a relay K2, and the other end of the coil of the relay K2 is connected with a zero line N;
the normally open contact K2-1 of the relay K2 is connected with a closing button S1 in parallel;
one end of a normally open contact K2-2 of the relay K2 is connected to the lower port of a control loop power switch Q1, the other end of the normally open contact K2-2 of the relay K2 is connected with one end of a cooling device input indicator lamp H1, and the other end of H1 is connected to a zero line N;
one end of a normally closed contact K2-3 of the relay K2 is connected to the lower port of a control loop power switch Q1, the other end of the normally closed contact K2-3 of the relay K2 is connected with one end of a cooling device exit indicator lamp H2, and the other end of H2 is connected to a neutral wire N.
6. The nuclear power plant regulator electric heater switch cooling arrangement of claim 5, wherein: one end of a normally open contact K5-1 of the relay K5 is connected to a voltage stabilizer electric heater cooling device input/exit loop III, and the other end of a normally open contact K5-1 of the relay K5 is connected to a fan operation control loop IV;
the fan operation control loop IV comprises: an electric heater switch main contactor normally closed contact K1, an electric heater switch main contactor normally closed contact K1 ', an electric heater switch main contactor normally closed contact K1 ", an electric heater switch main contactor normally closed contact K1 ', an electric heater switch main contactor normally closed contact K1 ', a relay K6, a fan operation control contactor K3 and a fan operation control contactor K4;
the normally closed contact K1 of the electric heater switch main contactor, the normally closed contact K1 'of the electric heater switch main contactor, the normally closed contact K1' of the electric heater switch main contactor, the normally closed contact K1 '″ of the electric heater switch main contactor and the normally closed contact K1' of the electric heater switch main contactor are sequentially connected in series, one end of a K1, K1 ', K1', K1 ', K1' series branch is connected with the normally open contact K5-1 of the relay K5, the other end of the K1, K1 ', K1', K1 ', K1' series branch is connected with one end of the relay K6, and the other end of the relay K6 is connected with a neutral line N;
the relay K6 further comprises a relay K6 normally closed contact K6-1; one end of a relay K6 normally closed contact K6-1 is connected with a relay K5 normally open contact K5-1, the other end of the relay K6 normally closed contact K6-1 is connected with one end of a fan operation control contactor K3, the other end of the fan operation control contactor K3 is connected with a zero line N, and the fan operation control contactor K4 is connected with a fan operation control contactor K3 in parallel.
7. The nuclear power plant regulator electric heater switch cooling arrangement of claim 6, wherein: the alarm loop V comprises: a relay K5 normally closed contact K5-2 and an interlocking contact of each fan electric protection switch, wherein the interlocking contact of each fan electric protection switch is connected in parallel and outputs to a terminal row X10; the terminal row X10 includes: terminal row X10: 10 connection terminal and terminal row X10: 11 connecting terminals.
8. A method of controlling a nuclear power plant regulator electric heater switch cooling arrangement as claimed in any one of claims 1 to 7, including the steps of:
the method comprises the following steps: the cooling device is connected to an alternating current bus L1 through a primary plug X01, a 230V alternating current power supply is introduced, and power is supplied to a primary loop II of the cooling device, a voltage stabilizer electric heater cooling device input/exit loop III and a fan operation control loop IV through a main switch Q0;
step two: when a closing button S1 is pressed, a relay K2 and a relay K5 are electrified, a normally open contact K5-1 of the relay K5 is closed, and a fan operation control loop IV is electrified; a normally open contact K2-1 of a relay K2 connected with the contact of the closing button S1 in parallel is closed, and a relay K2 is self-maintained in a charged state;
meanwhile, a normally open contact K2-2 of the relay K2 is closed, an electric loop of a cooling device indicator lamp H1 is connected, the cooling device indicator lamp H1 is lightened, and the cooling device is indicated to be in an input state;
step three: when the tripping button S2 is pressed, the relay K2 and the relay K5 lose power, the normally open contact K5-1 of the relay K5 is disconnected, and the fan operation control loop IV is powered off; meanwhile, a normally closed contact K2-3 of the relay K2 is closed, an electric loop of a cooling device indicator lamp H2 is switched on, and a cooling device indicator lamp H2 is lightened to indicate that the cooling device is in an exit state;
the closing button S1, the trip button S2, the relay K2 and the relay K5 are used for controlling the input or exit of the cooling device and preventing the arc discharge phenomenon at the primary plug part when a load is pushed into or pulled out of the switch;
step four: when a maintenance person needs to maintain the cooling device, the trip button S2 is pressed, the device is quitted from operation, and the maintenance person can directly pull out the switch drawer to maintain the cooling device;
step five: when any one electric heater switch in a load switch cabinet in a row is used, the normally closed contacts K1, K1 ', K1 ", K1'", K1 "" of the main contactor corresponding to the electric heater switch are disconnected, so that the coil of the relay K6 is de-energized, meanwhile, the normally closed contact K6-1 of the relay K6 is closed, so that the coils of the fan operation control contactors K3 and K4 are electrified, normally open contacts of the fan operation control contactors K3 and K4 in the primary circuit II are closed, and the branch fans are electrified to operate;
when all electric heater switches in a row of switch cabinets are not put into use, normally closed contacts K1, K1 ', K1 ", K1'", K1 "" of main contactors of all electric heater switches are closed, coils of a relay K6 are electrified, a normally closed contact K6-1 of a relay K6 is opened, coils of the fan operation control contactors K3 and K4 are powered off, normally open contacts are opened, and fans of all branches are stopped;
step six: the state contact of each branch fan electric protection switch is connected with the normally closed contact of the relay K5 in parallel and output to the terminals 10 and 11 of the terminal row X10, when any fan electric protection switch is not switched on or switched off or the cooling device is withdrawn, the terminal row X10 of the alarm circuit V outputs a passive closed contact signal and sends a remote alarm signal.
CN202010691602.1A 2020-07-17 2020-07-17 Nuclear power plant voltage stabilizer electric heater switch cooling device and control method thereof Active CN111817187B (en)

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