CN202649328U

CN202649328U - FCL CPA self-trigger protection simulation device

Info

Publication number: CN202649328U
Application number: CN 201220135304
Authority: CN
Inventors: 杨增辉; 张旭航; 冯煜尧; 崔勇; 方陈
Original assignee: Shanghai Municipal Electric Power Co; East China Power Test and Research Institute Co Ltd
Current assignee: Shanghai Municipal Electric Power Co; East China Power Test and Research Institute Co Ltd
Priority date: 2012-04-01
Filing date: 2012-04-01
Publication date: 2013-01-02
Anticipated expiration: 2022-04-01

Abstract

The utility model discloses an FCL CPA self-trigger protection simulation device which belongs to test field. The CPA self-trigger protection simulation device comprises first, second and third current comparison modules, first, second and third logic 'and' modules, a logic 'or' module and a circuit overcurrent protection soft pressing plate switch. The FCL CPA self-trigger protection simulation device can truly simulate and reflect the condition of FCL device CPA self-trigger protection action in real time, provides starting discrimination logic or trigger criterion of corresponding protection logic for the measurement control and protection system and simulates the action result, can be conveniently realized in a real environment or virtual environment, has the characteristics of cross-platform, easy realization and good reproducibility, and can be widely used for the fields of the research, design and manufacture of an FCL device protection system.

Description

CPA self-triggering protection simulation device of FCL

Technical Field

The utility model belongs to measure the field, especially, relate to a testing arrangement for electric property.

Background

The increasing demand for electric power has led to the development of transmission systems for long distances, large capacities and high stability. Safe and stable operation of the power system is an important premise for sustainable development of national economy.

Short circuit faults are one of the most common faults that compromise the safe and stable operation of a power system.

In recent years, with the continuous strengthening of the power grid structure in China, the level of short-circuit current is continuously increased. The short-circuit current level of the power grid in many areas, particularly in the coastal economically developed areas, approaches or even exceeds the switch interruption capacity, so that the safety and the stability of the operation of the power system are greatly stressed, and the short-circuit current level becomes one of the main bottlenecks in the development of the power grid.

To maintain stable power transmission, it is important to quickly remove short-circuit fault protection. A general mechanical circuit breaker requires two or more cycles including an action time of relay protection to cut off a short-circuit current, and a rapid current limiting device used together with the circuit breaker can shorten a fault protection time.

The principle of a series resonance Fault Current Limiter (FCL) is shown in fig. 1, and it mainly consists of a reactor L, a capacitor C, and a fast bypass switch K (which may be a switch of the type such as a thyristor, a spark gap, a fast mechanical switch, or a combination thereof).

And the power frequency inductive reactance of the reactor L is the same as the capacitive reactance of the capacitor C in size. Under the normal working condition, the switch K is in an open state (the thyristor is in a blocking state), the capacitor C and the inductor L are in a power frequency series resonance state, and the total impedance is zero. When a fault is detected, the switch K is rapidly closed (the thyristor is rapidly conducted), the capacitor is bypassed, and equivalently, the inductor L is connected into the circuit to play a role in limiting current.

In an FCL device, a controllable spark GAP (referred to in the industry as GAP for short) is also typically connected across the capacitor in parallel.

The controllable spark GAP (GAP) is an overvoltage protection device for a capacitor bank.

In addition to the primary devices described above, the short-circuit fault detection, diagnosis and trigger control system is also an important component of the FCL apparatus. The measurement control protection system is a system for automatically measuring, controlling and protecting the main equipment of the FCL device, and the system is used for measuring the main electrical quantity and the operation state of the FCL device, controlling the operation state and monitoring and protecting the main equipment. The measurement control protection system is configured redundantly according to a dualization principle and has self-checking and self-diagnosis functions for the measurement control protection system and an external interface circuit. The two sets of systems are configured identically, run independently and are mutually in hot redundancy for standby. Each set of system comprises complete measuring, controlling, protecting, monitoring and signaling equipment, and can be started, operated and quitted independently. Therefore, when one set of the measurement control protection system exits due to a fault, the other set of the measurement control protection system can still ensure the normal input, operation and exit of the fault current limiter.

During the research or design phase of an FCL device, the above-described system must be tested and simulated, and the results of the research or design must be verified or modified with reference to the results of the testing and simulation.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a CPA of FCL is from triggering protection analogue means is provided, its CPA that can simulate really, reflect the FCL device is from triggering protection action condition, provides corresponding simulation result for its measurement control protection system's research or design, provides the verification platform to the research or the design of fault current limiter.

The technical scheme of the utility model is that: a CPA self-triggering protection simulation device of FCL is provided, which is characterized in that: the CPA self-triggering protection simulation device is composed of a first current comparison module, a second current comparison module, a third current comparison module, a first logic AND module, a second logic AND module, a logic OR module and a line overcurrent protection soft pressing plate switch.

First input ends of the first to third current comparison modules are sequentially and correspondingly connected with A, B, C three-phase instantaneous current signal ends respectively, second input ends of the first to third current comparison modules are connected with a line overcurrent protection set value end, and output ends of the first to third current comparison modules are sequentially and correspondingly connected with first input ends of the first to third logic AND modules; second input ends of the first to third logic AND modules are connected with a circuit overcurrent protection soft pressing plate switch; the output ends of the first to third logic AND modules are correspondingly connected with three input ends of the logic OR module; and the output end of the logic OR module outputs a line overcurrent protection action result.

Specifically, the first to third current comparison modules are comparison circuits.

The logic AND module is an AND gate circuit.

The logic OR module is an OR gate circuit.

Further, the first to third current comparison modules, the first to third logical and modules, the logical or module and the delay trigger module are module circuits formed by discrete electronic components.

Or, the first to third current comparing modules, the first to third logical and modules, the logical or module and the delay triggering module are module circuits formed by integrated circuit devices.

Compared with the prior art, the utility model has the advantages that:

1. the CPA self-triggering protection action condition of the FCL device can be truly simulated and reflected, the starting discrimination logic or triggering criterion of the corresponding protection logic is provided for the measurement control protection system, and the action result can be simulated;

2. the whole simulation device has concise logical relation, reliable action and easy realization;

3. in both real environments (implemented in real components) or virtual environments (implemented in computer software), with cross-platform, ease of implementation and good reproducibility.

Drawings

FIG. 1 is a schematic diagram of a fault current limiter;

FIG. 2 is a schematic view of the connection relationship between the components of the present invention;

fig. 3 is a schematic diagram of the logical relationship of the present apparatus.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

In fig. 1, the FCL device is mainly composed of a reactor L, a capacitor C, and a fast bypass switch K.

In fig. 2, the simulation apparatus is composed of first to third current comparison modules 1 to 3, first to third logical and modules 4 to 6, a logical or module 7, and a line overcurrent protection soft pressing plate switch K.

First input ends of the first to third current comparison modules are sequentially and correspondingly connected with A, B, C three-phase instantaneous current signals, second input ends of the first to third current comparison modules are connected with a line overcurrent protection set value, and output ends of the first to third current comparison modules are sequentially and correspondingly connected with first input ends of the first to third logic AND modules; second input ends of the first to third logic AND modules are connected with a circuit overcurrent protection soft pressing plate switch; the output ends of the first to third logic AND modules are correspondingly connected with three input ends of the logic OR module; and the output end of the logic OR module outputs a line overcurrent protection action result.

The logic AND module is an AND gate circuit.

The logic OR module is an OR gate circuit.

Or, the first to third current comparison modules, the first to third logic and modules, the logic or module and the delay triggering module are module circuits formed by software simulation function modules.

Specifically, the comparison circuit may be implemented by an NE556 integrated chip or an integrated circuit with the same function as the NE556 integrated chip, the and gate circuit may be implemented by a 555 integrated chip, or the gate circuit may be implemented by an NC7S86M5X integrated chip.

In the figure, Ia, Ib and Ic are instantaneous current values of three phases, and Iset is a constant value of line overcurrent protection.

Since the specific circuits constituting the functional circuits are all the prior art, those skilled in the art can completely use various discrete components, integrated circuits or analog circuits corresponding to the functions in computer software to construct the functional circuits, and therefore the specific circuit diagrams thereof are not described herein.

In fig. 3, a schematic diagram of the logical relationship of the present apparatus is given, and it is obvious that the logical relationship or the logical function can be implemented by actual electronic components (real environment) or by computer software (virtual environment).

Therefore, the device has the characteristics of cross-platform performance, easy realization and good reproducibility.

Because the utility model discloses can simulate, reflect the CPA of FCL device in real time, dynamically and trigger the protection action condition, can realize in real environment (realize with actual component) or virtual environment (realize with computer software), provide the trigger criterion of protection action for FCL device protection system to can simulate its action result.

The utility model discloses can extensively be used for FCL device protection system's research, design, manufacturing field.

Claims

1. A CAP self-triggering protection simulation device of FCL is characterized in that:

the CAP self-triggering protection simulation device consists of first to third current comparison modules, first to third logic AND modules, a logic OR module and a line overcurrent protection soft pressing plate switch; wherein,

first input ends of the first to third current comparison modules are sequentially and correspondingly connected with A, B, C three-phase instantaneous current signal ends respectively, second input ends of the first to third current comparison modules are connected with a line overcurrent protection set value end, and output ends of the first to third current comparison modules are sequentially and correspondingly connected with first input ends of the first to third logic AND modules;

second input ends of the first to third logic AND modules are connected with a circuit overcurrent protection soft pressing plate switch;

the output ends of the first to third logic AND modules are correspondingly connected with three input ends of the logic OR module;

and the output end of the logic OR module outputs a line overcurrent protection action result.

2. A CAP self-triggering protection emulation device of an FCL according to claim 1, wherein the first through third current comparison modules are comparison circuits.

3. A CAP self-triggering protection emulation device for an FCL according to claim 1, wherein the logical and block is an and circuit.

4. A CAP self-triggering protection emulation device for an FCL according to claim 1, wherein said logical or block is an or gate.

5. A CAP self-triggering protection emulation device of an FCL according to claim 1, wherein the first to third current comparison modules, the first to third logical and modules, the logical or module, and the delay trigger module are modular circuits formed of discrete electronic components.

6. A CAP self-triggering protection emulation device of an FCL according to claim 1, wherein the first to third current comparison modules, the first to third logical and modules, the logical or module, and the delay trigger module are module circuits formed of integrated circuit devices.