CN212183125U - Current and voltage secondary protection module - Google Patents

Abstract

And the current and voltage secondary protection module. Relates to electric power overhaul equipment, in particular to a current-voltage secondary protection module of a bypass quick-switching switch. The utility model comprises a Va protection circuit and an IA protection circuit; the IA protection circuit comprises a capacitor C1, a voltage dependent resistor R1, a voltage dependent resistor R2, a resistor R3, a resistor R4, a trigger diode Q1 and a trigger diode Q2; a resistance-type voltage sensor is arranged at the front end of Va, one end of the resistance-type voltage sensor is connected with high voltage, and the other end of the resistance-type voltage sensor is connected with Va; va is sampling voltage, and anti-surge protection is performed through a gas protection tube D3; r5 is the numerical value of high accuracy sampling resistance through controller sampling R5 to judge that primary circuit has not had pressure and actual voltage value. The utility model is used for secondary circuit with when intelligent control ware module is not connected or is connected insecure, effectively guarantee that the secondary side of three-phase circuit mutual-inductor (CT) does not open a way, avoid arousing high voltage at three-phase circuit mutual-inductor secondary side, cause the accident.

Description

Current and voltage secondary protection module

Technical Field

The utility model relates to an electric power overhauls equipment, especially relates to a current-voltage secondary protection module of bypass fast switch.

Background

Along with the rapid development of the urban construction process and the increase of the strength of newly building and transforming a power distribution network, the requirements of people on less power failure and even no power outage are higher and higher when planned maintenance and fault first-aid repair are carried out. At present, the distribution network overhead lines in various cities have fewer breaking switches, and when the overhead lines are overhauled or repaired, the power of the whole line is usually required to be cut off, or sudden operation faults of cable lines also need to be detected and repaired in a longer time; in addition, in the city, important power utilization units, major activities and the like all require high power supply reliability.

The maintenance of present distribution equipment is changed, and problem equipment carries out maintenance goods and changes behind the disconnection upper reaches switch, and its process needs several hours, must cause power consumer's long-time power failure like this, causes economic loss and a great deal of inconvenience to the user. In order to solve the problems, at present, the bypass is opened and closed through a bypass quick-opening switch, the power supply reliability of equipment and a power grid is improved, planned maintenance and fault first-aid repair work is completed safely and quickly, the contradiction between the power-off maintenance of the equipment and the uninterrupted power supply to a user is effectively solved, and the safe power supply service quality is greatly improved, as shown in fig. 5.

As shown in fig. 4, the bypass quick-cut switch includes a breaker module electrically connected to the intelligent controller module through a cable;

the circuit breaker module comprises a main circuit, a three-phase current transformer, an incoming line side three-phase voltage sensor, an outgoing line side three-phase voltage sensor, a spring operating mechanism, a switch position signal module and a current and voltage secondary protection module;

the three-phase current transformer is arranged on the main loop, converts large current in the circuit into small current of 1A, and is used for an intelligent controller module to acquire data, monitor line current and judge faults;

one end of the incoming line side three-phase voltage sensor module and one end of the outgoing line side three-phase voltage sensor module are respectively electrically connected with the main circuit; the other end of the incoming line side three-phase voltage sensor module and the other end of the outgoing line side three-phase voltage sensor module are respectively and electrically connected with the current and voltage secondary protection module; reducing the high voltage on the power transmission line to the low voltage collected by the intelligent controller module, and using the intelligent controller module to perform electrical protection and automatic control on each fault of the power grid so as to realize the electrical isolation function of the primary system and the secondary system;

the three-phase current transformer, the incoming line side three-phase voltage sensor and the outgoing line side three-phase voltage sensor are electrically connected with the intelligent controller module respectively, and accidents occur when a secondary circuit is not connected or is not firmly connected with the intelligent controller module in the actual use process.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to above problem, the secondary side that provides effective assurance three phase circuit mutual-inductor (CT) does not open a way, avoids arousing the high voltage at three phase circuit mutual-inductor secondary side, causes the current-voltage secondary protection module of accident.

The technical scheme of the utility model is that: comprises a Va protection circuit and an IA protection circuit;

the Va protection circuit comprises a gas protection tube D3 and a sampling resistor R5 which are connected in parallel;

the IA protection circuit comprises a capacitor C1, a voltage dependent resistor R1, a voltage dependent resistor R2, a resistor R3, a resistor R4, a trigger diode Q1 and a trigger diode Q2;

the first ends of the capacitor C1, the piezoresistor R1, the piezoresistor R2 and the trigger diode Q2 are respectively electrically connected with the first input end IA;

the piezoresistor R2 is connected with the resistor R3 in series;

the second ends of the capacitor C1, the voltage dependent resistor R1, the resistor R3 and the trigger diode Q2 are respectively electrically connected with a second input end IN;

one end of the resistor R4 is connected between the voltage dependent resistor R2 and the resistor R3, and the other end is electrically connected with the trigger diode Q2 through the trigger diode Q1.

The IB protection circuit is also included;

the IB protection circuit comprises a capacitor C1-B, a voltage dependent resistor R1-B, a voltage dependent resistor R2-B, a resistor R3-B, a resistor R4-B, a trigger diode Q1-B and a trigger diode Q2-B;

the first ends of the capacitor C1-B, the piezoresistor R1-B, the piezoresistor R2-B and the trigger diode Q2-B are respectively electrically connected with the first input end IB;

the piezoresistor R2-B is connected with the resistor R3-B in series;

the second ends of the capacitor C1-B, the voltage dependent resistor R1-B, the resistor R3-B and the trigger diode Q2-B are respectively electrically connected with a second input end IN;

one end of the resistor R4-B is connected between the piezoresistor R2-B and the resistor R3-B, and the other end is electrically connected with the trigger diode Q2-B through the trigger diode Q1-B.

Also include Vb protective circuit;

the Vb protection circuit comprises a gas protection tube D3-b and a sampling resistor R5-b which are connected in parallel.

The utility model comprises a Va protection circuit and an IA protection circuit; the Va protection circuit comprises a gas protection tube D3 and a sampling resistor R5 which are connected in parallel; the IA protection circuit comprises a capacitor C1, a voltage dependent resistor R1, a voltage dependent resistor R2, a resistor R3, a resistor R4, a trigger diode Q1 and a trigger diode Q2; a resistance-type voltage sensor is arranged at the front end of Va, one end of the resistance-type voltage sensor is connected with high voltage, and the other end of the resistance-type voltage sensor is connected with Va; va is sampling voltage, and anti-surge protection is performed through a gas protection tube D3; r5 is the numerical value of high accuracy sampling resistance through controller sampling R5 to judge that primary circuit has not had pressure and actual voltage value. The utility model is used for secondary circuit with when intelligent control ware module is not connected or is connected insecure, effectively guarantee that the secondary side of three-phase circuit mutual-inductor (CT) does not open a way, avoid arousing high voltage at three-phase circuit mutual-inductor secondary side, cause the accident.

Drawings

Figure 1 is a schematic diagram of the structure of a current-voltage secondary protection module,

figure 2 is a schematic diagram of the structure of the IA protection circuit,

figure 3 is a schematic diagram of the structure of the IB protection circuit,

figure 4 is a schematic diagram of the structure of the Va protection circuit,

figure 5 is a schematic diagram of the structure of the Va protection circuit,

fig. 6 is a schematic structural diagram illustrating an electrical connection principle between the bypass fast switch and the controller (the controller includes a controller simulation module and a controller CPU module).

Detailed Description

The utility model is shown in figures 1-6; comprises a Va protection circuit and an IA protection circuit;

the Va protection circuit comprises a gas protection tube D3 and a sampling resistor R5 which are connected in parallel;

a resistance-type voltage sensor is arranged at the front end of Va, one end of the resistance-type voltage sensor is connected with high voltage, and the other end of the resistance-type voltage sensor is connected with Va; va is sampling voltage, and anti-surge protection is performed through a gas protection tube D3; r5 is the numerical value of high accuracy sampling resistance through controller sampling R5 to judge that primary circuit has not had pressure and actual voltage value.

In the scheme, except for the Va protection circuit, Vb, Vc, Vr, Vs and Vt protection circuits are further arranged, the structure of the Vb protection circuit is the same as that of the Va protection circuit, for example, as shown in FIG. 6, the left side ends of the Vb protection circuit are Vb ends and GND ends respectively, the right side ends of the Vb protection circuit are RA-m ends and RA-g ends respectively, and electrical components are electrically connected with one another in the same manner.

The IA protection circuit comprises a capacitor C1, a voltage dependent resistor R1, a voltage dependent resistor R2, a resistor R3, a resistor R4, a trigger diode Q1 and a trigger diode Q2;

the first ends of the capacitor C1, the piezoresistor R1, the piezoresistor R2 and the trigger diode Q2 are respectively electrically connected with the first input end IA;

the piezoresistor R2 is connected with the resistor R3 in series;

the second ends of the capacitor C1, the voltage dependent resistor R1, the resistor R3 and the trigger diode Q2 are respectively electrically connected with a second input end IN;

one end of the resistor R4 is connected between the voltage dependent resistor R2 and the resistor R3, and the other end is electrically connected with the trigger diode Q2 through the trigger diode Q1. Two ends of the trigger diode Q2 are output ends, and a second input end of the trigger diode Q2 is grounded.

Filtering is carried out through the capacitor C1, and surge overvoltage protection can be carried out through the piezoresistor R1;

the voltage dependent resistor R2 prevents the voltage value between IA and IN from rising caused by the open circuit of the secondary side of the CT, reduces the resistance value of the resistor per se, and the voltage of the two ends of the R3 rises, thereby triggering the conduction of the diode Q1; in a normal state (without open circuit), the value of the voltage dependent resistor is infinite, the trigger diode Q1 and the bidirectional thyristor Q2 do not work, and the collection of the controller to a current loop is not influenced;

the resistor R4 is a current-limiting resistor and protects the trigger diode Q1;

after the diode Q1 of the bidirectional thyristor Q2 is triggered and conducted, the bidirectional thyristor Q2 is triggered and conducted, short circuit between IA and IN is realized, and overvoltage caused by open circuit of the secondary side of the CT is prevented;

in the scheme, an IB protection circuit and an IC protection circuit are arranged besides the IA protection circuit, the circuit structures of the IB protection circuit and the IC protection circuit are respectively the same as those of the IA, and only the connecting ends corresponding to the two ends are changed. As shown IN FIG. 6, for example, IB protection circuit has its left terminals IB and IN connected, respectively, and its right terminals RA-B and RA-D connected, respectively.

In the scheme, the three-phase current transformer, the incoming line side three-phase voltage sensor and the outgoing line side three-phase voltage sensor are electrically connected with the intelligent controller module through the current and voltage secondary protection module respectively; when the secondary circuit is not connected with the intelligent controller module or is not firmly connected with the intelligent controller module, the secondary side of a three-phase Circuit Transformer (CT) is effectively ensured not to be open-circuited, and accidents caused by high voltage on the secondary side of the three-phase circuit transformer are avoided;

the disclosure of the present application also includes the following points:

(1) the drawings of the embodiments disclosed herein only relate to the structures related to the embodiments disclosed herein, and other structures can refer to general designs;

(2) in case of conflict, the embodiments and features of the embodiments disclosed in this application can be combined with each other to arrive at new embodiments;

the above embodiments are only embodiments disclosed in the present disclosure, but the scope of the disclosure is not limited thereto, and the scope of the disclosure should be determined by the scope of the claims.

Claims (3)

1. The current-voltage secondary protection module is characterized by comprising a Va protection circuit and an IA protection circuit;

the Va protection circuit comprises a gas protection tube D3 and a sampling resistor R5 which are connected in parallel;

the IA protection circuit comprises a capacitor C1, a voltage dependent resistor R1, a voltage dependent resistor R2, a resistor R3, a resistor R4, a trigger diode Q1 and a trigger diode Q2;

the first ends of the capacitor C1, the piezoresistor R1, the piezoresistor R2 and the trigger diode Q2 are respectively electrically connected with the first input end IA;

the piezoresistor R2 is connected with the resistor R3 in series;

the second ends of the capacitor C1, the voltage dependent resistor R1, the resistor R3 and the trigger diode Q2 are respectively electrically connected with a second input end IN;

one end of the resistor R4 is connected between the voltage dependent resistor R2 and the resistor R3, and the other end is electrically connected with the trigger diode Q2 through the trigger diode Q1.

2. The current-voltage secondary protection module of claim 1, further comprising an IB protection circuit;

the IB protection circuit comprises a capacitor C1-B, a voltage dependent resistor R1-B, a voltage dependent resistor R2-B, a resistor R3-B, a resistor R4-B, a trigger diode Q1-B and a trigger diode Q2-B;

the first ends of the capacitor C1-B, the piezoresistor R1-B, the piezoresistor R2-B and the trigger diode Q2-B are respectively electrically connected with the first input end IB;

the piezoresistor R2-B is connected with the resistor R3-B in series;

the second ends of the capacitor C1-B, the voltage dependent resistor R1-B, the resistor R3-B and the trigger diode Q2-B are respectively electrically connected with a second input end IN;

one end of the resistor R4-B is connected between the piezoresistor R2-B and the resistor R3-B, and the other end is electrically connected with the trigger diode Q2-B through the trigger diode Q1-B.

3. The current-voltage secondary protection module of claim 1, further comprising a Vb protection circuit;

the Vb protection circuit comprises a gas protection tube D3-b and a sampling resistor R5-b which are connected in parallel.

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