1 Application range

This relay is used in the generator excitation protection circuit to reflect the excessively low symmetrical positive sequence component as a low-voltage starting component.

2 Model definition

3 Working principle and main performance

3.1 Working principle

Under normal operating conditions, the negative sequence component UF<negative sequence threshold UB2, and the positive sequence component UZ>positive sequence threshold UB1, the relay J does not act.

When an asymmetric short-circuit fault occurs, the negative sequence component UF≥UB2, regardless of whether the positive sequence component output is less than the positive sequence threshold UB1, at this time the negative sequence loop is blocked and the relay J does not operate.

When the positive sequence component UZ ≤ the positive sequence threshold UB1, the negative sequence component UF <the negative sequence threshold UB2, and the relay J acts.

3.2 Main performance

3.2.1 This relay is mainly composed of integrated circuits. Stable performance, high reliability, high accuracy of the action value, small discrete value, wide setting range, fast action and return speed, good return coefficient, small load on the transformer, vibration resistance, anti-interference and high insulation level.

3.2.2 The setting is set by the dial switch on the relay panel, which is intuitive and convenient. The relay debugging is simple and convenient, without adjustment on site.

3.2.3 During normal operation, the output of the negative sequence unbalanced component of the relay is extremely small; when an asymmetrical short circuit occurs, the negative sequence component blocks the relay action.

3.2.4 The relay has running and action indicator light

4 Technical conditions

4.1 Environmental reference conditions

Environment temperature: 20±2℃

Relative humidity: 45%～75%

Atmospheric pressure: 86～106KPa

4.2 Normal use conditions

Ambient temperature: -10℃～+50℃

Relative humidity of environment: not more than 90%

Atmospheric pressure: 80～110KPa

Limit temperature during storage and transportation: -25℃～+70℃

The altitude of the place of use: no more than 2500 meters

The surrounding medium of the operating environment has no explosion hazard; it does not contain corrosive gas; the concentration of conductive dust contained should not reduce the insulation level

Below the allowable limit value.

Reliable power supply.

4.3 Rated parameters

Rated AC voltage: 100V; Rated frequency: 50HZ

Auxiliary DC power supply rated voltage: 220V, 110V; allowable voltage fluctuation range: 0.8 to 1.15 times the rated voltage.

4.4 Characteristic parameters

Action range: 2～21.8V; level difference: 0.2V; setting error: not more than ±4%

Action time: no more than 30mS; return time: no more than 30mS; return coefficient: no more than 1.1

4.5 Maximum power consumption:

AC voltage circuit: under 100V, each phase is not more than 0.5VA.

Auxiliary power circuit: under the condition of rated voltage 220VDC, not more than 6W.

4.6 Maximum capacity of contacts:

Cut-off load capacity: DC 250V or less, τ=5ms, inductive load 50W, resistive load 150W;

AC below 250V, load 1200VA;

Allow long-term connection current: 5A.

4.7 AC voltage circuit overload capacity: continuous work under 1.2 times the rated voltage

4.8 Insulation resistance: Use an open-circuit voltage 500V megger to measure the insulation resistance between the exposed non-charged metal parts or shells of the relays connected to each conductive terminal and should not be less than 10MΩ.

4.9 Insulation withstand voltage: each lead-out terminal to the housing locking screw can withstand a power frequency voltage of 2000V, and the same group of contacts can withstand a power frequency voltage of 1000V, which lasts for one minute without breakdown.

4.10 Anti-interference performance: meet the national GB6162-85 "Electrical Interference Test of Static Relays and Protection Devices" standard.

4.11 Electrical life: In the DC250V circuit, cut off the current τ=5ms, 50W, more than 104 times.

4.12 Mechanical life: The contact is 3 million times in no-load state.

5 Structure type (see the relay structure size diagram for details)

5.1 Embedded board rear wiring structure AK11, AP11 and protruding board front wiring AQ11 rear view wiring diagram (subject to company product samples)

6 Use

6.1 Before energizing the relay, confirm whether the voltage level and current value of the connected relay are consistent with the actual parameters, otherwise the relay may be damaged; check whether the relay is damaged during transportation and storage, and the relay screw fasteners should not be loose; There are damaged parts, please contact us to replace them.

6.2 According to the formula on the panel of the relay, use the dial switch to set the value.

When the operating range: 2～21.8V, the setting formula: U=2[□+0.1□+1]V

7 Ordering instructions

When ordering, please indicate the relay model, specification, quantity, structure, auxiliary power supply rated voltage, AC rated voltage and other requirements.