I.Product Features And Uses

HZMN-D3 The simulated circuit breaker (hereinafter referred to as the simulated circuit breaker) is specifically designed for relay protection with switch linkage simulation tests. It is manufactured using integrated circuits to realize trip and close time setting, input signal logic control, and power electronic devices with protection . The trip coil is designed with independent dual circuits and can simulate... 6-500KV The operating behavior of three-phase or single- phase operating circuit breakers with single or double trip coils at various voltage levels . Suitable for use in power systems, industrial and mining enterprises, research institutes, professional colleges, and protection manufacturers. As a replacement device for the actual circuit breaker during transmission tests of relay protection and automatic devices with switchgear systems, it offers accurate and reliable operation with no limit on the number of operations, greatly improving the accuracy and completeness of the test, minimizing the number of actual circuit breaker operations, and extending service life. It is an important supporting equipment for relay protection testing.

II.Technical Parameters

Operating power supply voltage AC: 220V ± 10% 50Hz Operating current less than 0.5A.

Trip and close operation voltage：DC: 88V～220V.

Trip time selection: 20ms to 990ms, minimum step size 10ms, with an error not exceeding ±5ms.

The closing time can be selected from 20ms to 990ms, with a minimum step size. 10ms, with an error not exceeding ±5ms.

Trip and closing current selection according to 220V Calculate: 0.25A, 0.5A, 1.0A, 2.0A, 3.0A, 4.0A, 5.0A.

When trip coils I and II are used in parallel, the trip current doubles.

The tripping and closing currents are automatically cut off by controlling the tripping and closing times.

circuit breaker is operated using the "Manual Closing" and "Manual Tripping" buttons on the panel , no current flows through the simulated circuit breaker's tripping and closing coils.

Circuit breaker failure: When the simulated circuit breaker failure button is pressed, the simulated circuit breaker does not operate. The tripping and closing currents are disconnected after a 1-second delay, and then resume current flow after another 20 seconds.When the delay is 1s Then disconnected, then via 20s The current was then restored.

Phase-by-phase/Three-phase operation selection: Allows for either phase-by-phase or three-phase operation, selectable via the phase-by-phase/three-phase button.

Manual trip/close function selection: Enables manual three-phase tripping and closing.

Output capacity: Normally open and normally closed contacts: AC 220V/5A, DC 220V/0.5A.

Output contacts The simulated circuit breaker has 12 pairs of independent output contacts, divided into two groups corresponding to the simulated circuit breaker trip coils. Each phase of the trip coil has two pairs of normally open and normally closed contacts, with corresponding indicator lights displaying their status.

Hand jump, hand contact point  The manual trip and manual close contacts each have a pair of synchronous output normally open contacts. When the manual trip button is pressed, the green trip indicator light illuminates, the manual trip contact closes, the contact indicator light illuminates and delays for 60 seconds, then the contact opens and the indicator light goes out. When the manual close button is pressed, the red close indicator light illuminates, the manual close contact closes, and the contact indicator light illuminates.

Dimensions and weight: 330mm×220mm× 180mm, 6kg.